/*
 *  qemu user main
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>

#include "qemu.h"
#include "qemu-common.h"
#include "cache-utils.h"
/* For tb_lock */
#include "exec-all.h"

#define DEBUG_LOGFILE "/tmp/qemu.log"

static const char *interp_prefix = CONFIG_QEMU_PREFIX;
const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
int show_missing_syscalls;
int gdb_wrapper;

#ifndef CONFIG_STATIC
/* Reserve an are of memory to prevent the host ld.so doing silly things.
   Starting at address zero seems to cause problems, so start shortly
   after.  We reserve an arbitrary size of 64M.  This should be large
   enough for most applications without hitting too many ulimits.  */
/* These values must be consistent with the linker script.  Note that the
   page for the program headers is not unmapped.  */
# define RESERVED_SEGMENT_START 0x2000ul
# define RESERVED2_SEGMENT_START 0x10000000ul
# ifndef TARGET_PPC
#  define RESERVED_SEGMENT_SIZE 1024*1024*64
#  define RESERVED2_SEGMENT_SIZE 0
# else
#  define RESERVED_SEGMENT_SIZE 0
#  define RESERVED2_SEGMENT_SIZE 1024*1024*64
# endif
asm (".section .reserved, \"a\", %nobits\n"
     ".space " stringify(RESERVED_SEGMENT_SIZE) " + 0x100\n"
     ".previous");
asm (".section .reserved2, \"a\", %nobits\n"
     ".space " stringify(RESERVED2_SEGMENT_SIZE) "\n"
     ".previous");
#endif

/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
   we allocate a bigger stack. Need a better solution, for example
   by remapping the process stack directly at the right place */
unsigned long x86_stack_size = 16 * 1024 * 1024;

void gemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

void cpu_outb(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
}

void cpu_outw(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
}

void cpu_outl(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}

int cpu_inb(CPUState *env, int addr)
{
    fprintf(stderr, "inb: port=0x%04x\n", addr);
    return 0;
}

int cpu_inw(CPUState *env, int addr)
{
    fprintf(stderr, "inw: port=0x%04x\n", addr);
    return 0;
}

int cpu_inl(CPUState *env, int addr)
{
    fprintf(stderr, "inl: port=0x%04x\n", addr);
    return 0;
}

#if defined(TARGET_I386)
int cpu_get_pic_interrupt(CPUState *env)
{
    return -1;
}
#endif

/* timers for rdtsc */

#if 0

static uint64_t emu_time;

int64_t cpu_get_real_ticks(void)
{
    return emu_time++;
}

#endif

#if defined(USE_NPTL)
/***********************************************************/
/* Helper routines for implementing atomic operations.  */

/* To implement exclusive operations we force all cpus to syncronise.
   We don't require a full sync, only that no cpus are executing guest code.
   The alternative is to map target atomic ops onto host equivalents,
   which requires quite a lot of per host/target work.  */
static pthread_mutex_t exclusive_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t exclusive_cond = PTHREAD_COND_INITIALIZER;
static pthread_cond_t exclusive_resume = PTHREAD_COND_INITIALIZER;
static int pending_cpus;

/* Make sure everything is in a consistent state for calling fork().  */
void fork_start(void)
{
    mmap_fork_start();
    pthread_mutex_lock(&tb_lock);
    pthread_mutex_lock(&exclusive_lock);
}

void fork_end(int child)
{
    if (child) {
        /* Child processes created by fork() only have a single thread.
           Discard information about the parent threads.  */
        first_cpu = thread_env;
        thread_env->next_cpu = NULL;
        pending_cpus = 0;
        pthread_mutex_init(&exclusive_lock, NULL);
        pthread_cond_init(&exclusive_cond, NULL);
        pthread_cond_init(&exclusive_resume, NULL);
        pthread_mutex_init(&tb_lock, NULL);
        gdbserver_fork(thread_env);
    } else {
        pthread_mutex_unlock(&exclusive_lock);
        pthread_mutex_unlock(&tb_lock);
    }
    mmap_fork_end(child);
}

/* Wait for pending exclusive operations to complete.  The exclusive lock
   must be held.  */
static inline void exclusive_idle(void)
{
    while (pending_cpus) {
        pthread_cond_wait(&exclusive_resume, &exclusive_lock);
    }
}

/* Start an exclusive operation.
   Must only be called from outside cpu_arm_exec.   */
static inline void start_exclusive(void)
{
    CPUState *other;
    pthread_mutex_lock(&exclusive_lock);
    exclusive_idle();

    pending_cpus = 1;
    /* Make all other cpus stop executing.  */
    for (other = first_cpu; other; other = other->next_cpu) {
        if (other->running) {
            pending_cpus++;
            cpu_interrupt(other, CPU_INTERRUPT_EXIT);
        }
    }
    if (pending_cpus > 1) {
        pthread_cond_wait(&exclusive_cond, &exclusive_lock);
    }
}

/* Finish an exclusive operation.  */
static inline void end_exclusive(void)
{
    pending_cpus = 0;
    pthread_cond_broadcast(&exclusive_resume);
    pthread_mutex_unlock(&exclusive_lock);
}

/* Wait for exclusive ops to finish, and begin cpu execution.  */
static inline void cpu_exec_start(CPUState *env)
{
    pthread_mutex_lock(&exclusive_lock);
    exclusive_idle();
    env->running = 1;
    pthread_mutex_unlock(&exclusive_lock);
}

/* Mark cpu as not executing, and release pending exclusive ops.  */
static inline void cpu_exec_end(CPUState *env)
{
    pthread_mutex_lock(&exclusive_lock);
    env->running = 0;
    if (pending_cpus > 1) {
        pending_cpus--;
        if (pending_cpus == 1) {
            pthread_cond_signal(&exclusive_cond);
        }
    }
    exclusive_idle();
    pthread_mutex_unlock(&exclusive_lock);
}
#else /* if !USE_NPTL */
/* These are no-ops because we are not threadsafe.  */
static inline void cpu_exec_start(CPUState *env)
{
}

static inline void cpu_exec_end(CPUState *env)
{
}

static inline void start_exclusive(void)
{
}

static inline void end_exclusive(void)
{
}

void fork_start(void)
{
}

void fork_end(int child)
{
    if (child) {
        gdbserver_fork(thread_env);
    }
}
#endif


#ifdef TARGET_I386
/***********************************************************/
/* CPUX86 core interface */

void cpu_smm_update(CPUState *env)
{
}

uint64_t cpu_get_tsc(CPUX86State *env)
{
    return cpu_get_real_ticks();
}

static void write_dt(void *ptr, unsigned long addr, unsigned long limit,
                     int flags)
{
    unsigned int e1, e2;
    uint32_t *p;
    e1 = (addr << 16) | (limit & 0xffff);
    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
    e2 |= flags;
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

static uint64_t *idt_table;
#ifdef TARGET_X86_64
static void set_gate64(void *ptr, unsigned int type, unsigned int dpl,
                       uint64_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
    p[2] = tswap32(addr >> 32);
    p[3] = 0;
}
/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate64(idt_table + n * 2, 0, dpl, 0, 0);
}
#else
static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
                     uint32_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate(idt_table + n, 0, dpl, 0, 0);
}
#endif

void cpu_loop(CPUX86State *env)
{
    int trapnr;
    abi_ulong pc;
    target_siginfo_t info;

    for(;;) {
        trapnr = cpu_x86_exec(env);
        switch(trapnr) {
        case 0x80:
            /* linux syscall from int $0x80 */
            env->regs[R_EAX] = do_syscall(env,
                                          env->regs[R_EAX],
                                          env->regs[R_EBX],
                                          env->regs[R_ECX],
                                          env->regs[R_EDX],
                                          env->regs[R_ESI],
                                          env->regs[R_EDI],
                                          env->regs[R_EBP]);
            break;
#ifndef TARGET_ABI32
        case EXCP_SYSCALL:
            /* linux syscall from syscall intruction */
            env->regs[R_EAX] = do_syscall(env,
                                          env->regs[R_EAX],
                                          env->regs[R_EDI],
                                          env->regs[R_ESI],
                                          env->regs[R_EDX],
                                          env->regs[10],
                                          env->regs[8],
                                          env->regs[9]);
            env->eip = env->exception_next_eip;
            break;
#endif
        case EXCP0B_NOSEG:
        case EXCP0C_STACK:
            info.si_signo = SIGBUS;
            info.si_errno = 0;
            info.si_code = TARGET_SI_KERNEL;
            info._sifields._sigfault._addr = 0;
            queue_signal(env, info.si_signo, &info);
            break;
        case EXCP0D_GPF:
            /* XXX: potential problem if ABI32 */
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_fault(env);
            } else
#endif
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SI_KERNEL;
                info._sifields._sigfault._addr = 0;
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP0E_PAGE:
            info.si_signo = SIGSEGV;
            info.si_errno = 0;
            if (!(env->error_code & 1))
                info.si_code = TARGET_SEGV_MAPERR;
            else
                info.si_code = TARGET_SEGV_ACCERR;
            info._sifields._sigfault._addr = env->cr[2];
            queue_signal(env, info.si_signo, &info);
            break;
        case EXCP00_DIVZ:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                /* division by zero */
                info.si_signo = SIGFPE;
                info.si_errno = 0;
                info.si_code = TARGET_FPE_INTDIV;
                info._sifields._sigfault._addr = env->eip;
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP01_DB:
        case EXCP03_INT3:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                info.si_signo = SIGTRAP;
                info.si_errno = 0;
                if (trapnr == EXCP01_DB) {
                    info.si_code = TARGET_TRAP_BRKPT;
                    info._sifields._sigfault._addr = env->eip;
                } else {
                    info.si_code = TARGET_SI_KERNEL;
                    info._sifields._sigfault._addr = 0;
                }
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP04_INTO:
        case EXCP05_BOUND:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SI_KERNEL;
                info._sifields._sigfault._addr = 0;
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP06_ILLOP:
            info.si_signo = SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPN;
            info._sifields._sigfault._addr = env->eip;
            queue_signal(env, info.si_signo, &info);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            pc = env->segs[R_CS].base + env->eip;
            fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
                    (long)pc, trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_ARM

static void arm_cache_flush(abi_ulong start, abi_ulong last)
{
    abi_ulong addr, last1;

    if (last < start)
        return;
    addr = start;
    for(;;) {
        last1 = ((addr + TARGET_PAGE_SIZE) & TARGET_PAGE_MASK) - 1;
        if (last1 > last)
            last1 = last;
        tb_invalidate_page_range(addr, last1 + 1);
        if (last1 == last)
            break;
        addr = last1 + 1;
    }
}

/* Handle a jump to the kernel code page.  */
static int
do_kernel_trap(CPUARMState *env)
{
    uint32_t addr;
    uint32_t cpsr;
    uint32_t val;

    switch (env->regs[15]) {
    case 0xffff0fa0: /* __kernel_memory_barrier */
        /* ??? No-op. Will need to do better for SMP.  */
        break;
    case 0xffff0fc0: /* __kernel_cmpxchg */
         /* XXX: This only works between threads, not between processes.
            It's probably possible to implement this with native host
            operations. However things like ldrex/strex are much harder so
            there's not much point trying.  */
        start_exclusive();
        cpsr = cpsr_read(env);
        addr = env->regs[2];
        /* FIXME: This should SEGV if the access fails.  */
        if (get_user_u32(val, addr))
            val = ~env->regs[0];
        if (val == env->regs[0]) {
            val = env->regs[1];
            /* FIXME: Check for segfaults.  */
            put_user_u32(val, addr);
            env->regs[0] = 0;
            cpsr |= CPSR_C;
        } else {
            env->regs[0] = -1;
            cpsr &= ~CPSR_C;
        }
        cpsr_write(env, cpsr, CPSR_C);
        end_exclusive();
        break;
    case 0xffff0fe0: /* __kernel_get_tls */
        env->regs[0] = env->cp15.c13_tls2;
        break;
    default:
        return 1;
    }
    /* Jump back to the caller.  */
    addr = env->regs[14];
    if (addr & 1) {
        env->thumb = 1;
        addr &= ~1;
    }
    env->regs[15] = addr;

    return 0;
}

void cpu_loop(CPUARMState *env)
{
    int trapnr;
    unsigned int n, insn;
    target_siginfo_t info;
    uint32_t addr;

    for(;;) {
        cpu_exec_start(env);
        trapnr = cpu_arm_exec(env);
        cpu_exec_end(env);
        switch(trapnr) {
        case EXCP_UDEF:
            {
                TaskState *ts = env->opaque;
                uint32_t opcode;
                int rc;

                /* we handle the FPU emulation here, as Linux */
                /* we get the opcode */
                /* FIXME - what to do if get_user() fails? */
                get_user_u32(opcode, env->regs[15]);

                rc = EmulateAll(opcode, &ts->fpa, env);
                if (rc == 0) { /* illegal instruction */
                    info.si_signo = SIGILL;
                    info.si_errno = 0;
                    info.si_code = TARGET_ILL_ILLOPN;
                    info._sifields._sigfault._addr = env->regs[15];
                    queue_signal(env, info.si_signo, &info);
                } else if (rc < 0) { /* FP exception */
                    int arm_fpe=0;

                    /* translate softfloat flags to FPSR flags */
                    if (-rc & float_flag_invalid)
                      arm_fpe |= BIT_IOC;
                    if (-rc & float_flag_divbyzero)
                      arm_fpe |= BIT_DZC;
                    if (-rc & float_flag_overflow)
                      arm_fpe |= BIT_OFC;
                    if (-rc & float_flag_underflow)
                      arm_fpe |= BIT_UFC;
                    if (-rc & float_flag_inexact)
                      arm_fpe |= BIT_IXC;

                    FPSR fpsr = ts->fpa.fpsr;
                    //printf("fpsr 0x%x, arm_fpe 0x%x\n",fpsr,arm_fpe);

                    if (fpsr & (arm_fpe << 16)) { /* exception enabled? */
                      info.si_signo = SIGFPE;
                      info.si_errno = 0;

                      /* ordered by priority, least first */
                      if (arm_fpe & BIT_IXC) info.si_code = TARGET_FPE_FLTRES;
                      if (arm_fpe & BIT_UFC) info.si_code = TARGET_FPE_FLTUND;
                      if (arm_fpe & BIT_OFC) info.si_code = TARGET_FPE_FLTOVF;
                      if (arm_fpe & BIT_DZC) info.si_code = TARGET_FPE_FLTDIV;
                      if (arm_fpe & BIT_IOC) info.si_code = TARGET_FPE_FLTINV;

                      info._sifields._sigfault._addr = env->regs[15];
                      queue_signal(env, info.si_signo, &info);
                    } else {
                      env->regs[15] += 4;
                    }

                    /* accumulate unenabled exceptions */
                    if ((!(fpsr & BIT_IXE)) && (arm_fpe & BIT_IXC))
                      fpsr |= BIT_IXC;
                    if ((!(fpsr & BIT_UFE)) && (arm_fpe & BIT_UFC))
                      fpsr |= BIT_UFC;
                    if ((!(fpsr & BIT_OFE)) && (arm_fpe & BIT_OFC))
                      fpsr |= BIT_OFC;
                    if ((!(fpsr & BIT_DZE)) && (arm_fpe & BIT_DZC))
                      fpsr |= BIT_DZC;
                    if ((!(fpsr & BIT_IOE)) && (arm_fpe & BIT_IOC))
                      fpsr |= BIT_IOC;
                    ts->fpa.fpsr=fpsr;
                } else { /* everything OK */
                    /* increment PC */
                    env->regs[15] += 4;
                }
            }
            break;
        case EXCP_SWI:
        case EXCP_BKPT:
            {
                env->eabi = 1;
                /* system call */
                if (trapnr == EXCP_BKPT) {
                    if (env->thumb) {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_u16(insn, env->regs[15]);
                        if (env->bswap_code)
                            insn = bswap16(insn);
                        n = insn & 0xff;
                        env->regs[15] += 2;
                    } else {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_u32(insn, env->regs[15]);
                        if (env->bswap_code)
                            insn = bswap32(insn);
                        n = (insn & 0xf) | ((insn >> 4) & 0xff0);
                        env->regs[15] += 4;
                    }
                } else {
                    if (env->thumb) {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_u16(insn, env->regs[15] - 2);
                        if (env->bswap_code)
                            insn = bswap16(insn);
                        n = insn & 0xff;
                    } else {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_u32(insn, env->regs[15] - 4);
                        if (env->bswap_code)
                            insn = bswap32(insn);
                        n = insn & 0xffffff;
                    }
                }

                if (n == ARM_NR_semihosting
                    || n == ARM_NR_thumb_semihosting) {
                    env->regs[0] = do_arm_semihosting (env);
                } else if (n == 0 || n >= ARM_SYSCALL_BASE
                           || (env->thumb && n == ARM_THUMB_SYSCALL)) {
                    /* linux syscall */
                    if (env->thumb || n == 0) {
                        n = env->regs[7];
                    } else {
                        n -= ARM_SYSCALL_BASE;
                        env->eabi = 0;
                    }
                    if ( n > ARM_NR_BASE) {
                        switch (n) {
                        case ARM_NR_cacheflush:
                            arm_cache_flush(env->regs[0], env->regs[1]);
                            break;
                        case ARM_NR_set_tls:
                            cpu_set_tls(env, env->regs[0]);
                            env->regs[0] = 0;
                            break;
                        default:
                            gemu_log("qemu: Unsupported ARM syscall: 0x%x\n",
                                     n);
                            env->regs[0] = -TARGET_ENOSYS;
                            break;
                        }
                    } else {
                        env->regs[0] = do_syscall(env,
                                                  n,
                                                  env->regs[0],
                                                  env->regs[1],
                                                  env->regs[2],
                                                  env->regs[3],
                                                  env->regs[4],
                                                  env->regs[5]);
                    }
                } else {
                    goto error;
                }
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_PREFETCH_ABORT:
            addr = env->cp15.c6_insn;
            goto do_segv;
        case EXCP_DATA_ABORT:
            addr = env->cp15.c6_data;
            goto do_segv;
        do_segv:
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = addr;
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        case EXCP_KERNEL_TRAP:
            if (do_kernel_trap(env))
              goto error;
            break;
        default:
        error:
            fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
                    trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            abort();
        }
        process_pending_signals(env);
    }
}

#endif

#ifdef TARGET_SPARC
#define SPARC64_STACK_BIAS 2047

//#define DEBUG_WIN

/* WARNING: dealing with register windows _is_ complicated. More info
   can be found at http://www.sics.se/~psm/sparcstack.html */
static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
{
    index = (index + cwp * 16) % (16 * env->nwindows);
    /* wrap handling : if cwp is on the last window, then we use the
       registers 'after' the end */
    if (index < 8 && env->cwp == env->nwindows - 1)
        index += 16 * env->nwindows;
    return index;
}

/* save the register window 'cwp1' */
static inline void save_window_offset(CPUSPARCState *env, int cwp1)
{
    unsigned int i;
    abi_ulong sp_ptr;

    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if put_user() fails? */
        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
}

static void save_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->wim = new_wim;
#else
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->cansave++;
    env->canrestore--;
#endif
}

static void restore_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
#endif
    unsigned int i, cwp1;
    abi_ulong sp_ptr;

#ifndef TARGET_SPARC64
    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
#endif

    /* restore the invalid window */
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if get_user() fails? */
        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
#ifdef TARGET_SPARC64
    env->canrestore++;
    if (env->cleanwin < env->nwindows - 1)
        env->cleanwin++;
    env->cansave--;
#else
    env->wim = new_wim;
#endif
}

static void flush_windows(CPUSPARCState *env)
{
    int offset, cwp1;

    offset = 1;
    for(;;) {
        /* if restore would invoke restore_window(), then we can stop */
        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
#ifndef TARGET_SPARC64
        if (env->wim & (1 << cwp1))
            break;
#else
        if (env->canrestore == 0)
            break;
        env->cansave++;
        env->canrestore--;
#endif
        save_window_offset(env, cwp1);
        offset++;
    }
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
#ifndef TARGET_SPARC64
    /* set wim so that restore will reload the registers */
    env->wim = 1 << cwp1;
#endif
#if defined(DEBUG_WIN)
    printf("flush_windows: nb=%d\n", offset - 1);
#endif
}

void cpu_loop (CPUSPARCState *env)
{
    int trapnr, ret;
    target_siginfo_t info;

    while (1) {
        trapnr = cpu_sparc_exec (env);

        switch (trapnr) {
#ifndef TARGET_SPARC64
        case 0x88:
        case 0x90:
#else
        case 0x110:
        case 0x16d:
#endif
            ret = do_syscall (env, env->gregs[1],
                              env->regwptr[0], env->regwptr[1],
                              env->regwptr[2], env->regwptr[3],
                              env->regwptr[4], env->regwptr[5]);
            if ((unsigned int)ret >= (unsigned int)(-515)) {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc |= PSR_CARRY;
#else
                env->psr |= PSR_CARRY;
#endif
                ret = -ret;
            } else {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc &= ~PSR_CARRY;
#else
                env->psr &= ~PSR_CARRY;
#endif
            }
            env->regwptr[0] = ret;
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
        case 0x83: /* flush windows */
#ifdef TARGET_ABI32
        case 0x103:
#endif
            flush_windows(env);
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
#ifndef TARGET_SPARC64
        case TT_WIN_OVF: /* window overflow */
            save_window(env);
            break;
        case TT_WIN_UNF: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->mmuregs[4];
                queue_signal(env, info.si_signo, &info);
            }
            break;
#else
        case TT_SPILL: /* window overflow */
            save_window(env);
            break;
        case TT_FILL: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                if (trapnr == TT_DFAULT)
                    info._sifields._sigfault._addr = env->dmmuregs[4];
                else
                    info._sifields._sigfault._addr = env->tsptr->tpc;
                queue_signal(env, info.si_signo, &info);
            }
            break;
#ifndef TARGET_ABI32
        case 0x16e:
            flush_windows(env);
            sparc64_get_context(env);
            break;
        case 0x16f:
            flush_windows(env);
            sparc64_set_context(env);
            break;
#endif
#endif
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            exit (1);
        }
        process_pending_signals (env);
    }
}

#endif

#ifdef TARGET_PPC
static inline uint64_t cpu_ppc_get_tb (CPUState *env)
{
    /* TO FIX */
    return 0;
}

uint32_t cpu_ppc_load_tbl (CPUState *env)
{
    return cpu_ppc_get_tb(env) & 0xFFFFFFFF;
}

uint32_t cpu_ppc_load_tbu (CPUState *env)
{
    return cpu_ppc_get_tb(env) >> 32;
}

uint32_t cpu_ppc_load_atbl (CPUState *env)
{
    return cpu_ppc_get_tb(env) & 0xFFFFFFFF;
}

uint32_t cpu_ppc_load_atbu (CPUState *env)
{
    return cpu_ppc_get_tb(env) >> 32;
}

uint32_t cpu_ppc601_load_rtcu (CPUState *env)
__attribute__ (( alias ("cpu_ppc_load_tbu") ));

uint32_t cpu_ppc601_load_rtcl (CPUState *env)
{
    return cpu_ppc_load_tbl(env) & 0x3FFFFF80;
}

/* XXX: to be fixed */
int ppc_dcr_read (ppc_dcr_t *dcr_env, int dcrn, target_ulong *valp)
{
    return -1;
}

int ppc_dcr_write (ppc_dcr_t *dcr_env, int dcrn, target_ulong val)
{
    return -1;
}

#define EXCP_DUMP(env, fmt, args...)                                         \
do {                                                                          \
    fprintf(stderr, fmt , ##args);                                            \
    cpu_dump_state(env, stderr, fprintf, 0);                                  \
    if (loglevel != 0) {                                                      \
        fprintf(logfile, fmt , ##args);                                       \
        cpu_dump_state(env, logfile, fprintf, 0);                             \
    }                                                                         \
} while (0)

void cpu_loop(CPUPPCState *env)
{
    target_siginfo_t info;
    int trapnr;
    uint32_t ret;

    for(;;) {
        trapnr = cpu_ppc_exec(env);
        switch(trapnr) {
        case POWERPC_EXCP_NONE:
            /* Just go on */
            break;
        case POWERPC_EXCP_CRITICAL: /* Critical input                        */
            cpu_abort(env, "Critical interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_MCHECK:   /* Machine check exception               */
            cpu_abort(env, "Machine check exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DSI:      /* Data storage exception                */
            EXCP_DUMP(env, "Invalid data memory access: 0x" ADDRX "\n",
                      env->spr[SPR_DAR]);
            /* XXX: check this. Seems bugged */
            switch (env->error_code & 0xFF000000) {
            case 0x40000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            case 0x04000000:
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                info.si_code = TARGET_ILL_ILLADR;
                break;
            case 0x08000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_ACCERR;
                break;
            default:
                /* Let's send a regular segfault... */
                EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
                          env->error_code);
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            }
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_ISI:      /* Instruction storage exception         */
            EXCP_DUMP(env, "Invalid instruction fetch: 0x\n" ADDRX "\n",
                      env->spr[SPR_SRR0]);
            /* XXX: check this */
            switch (env->error_code & 0xFF000000) {
            case 0x40000000:
                info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            case 0x10000000:
            case 0x08000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_ACCERR;
                break;
            default:
                /* Let's send a regular segfault... */
                EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
                          env->error_code);
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            }
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_EXTERNAL: /* External input                        */
            cpu_abort(env, "External interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ALIGN:    /* Alignment exception                   */
            EXCP_DUMP(env, "Unaligned memory access\n");
            /* XXX: check this */
            info.si_signo = TARGET_SIGBUS;
            info.si_errno = 0;
            info.si_code = TARGET_BUS_ADRALN;
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_PROGRAM:  /* Program exception                     */
            /* XXX: check this */
            switch (env->error_code & ~0xF) {
            case POWERPC_EXCP_FP:
                EXCP_DUMP(env, "Floating point program exception\n");
                info.si_signo = TARGET_SIGFPE;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_FP_OX:
                    info.si_code = TARGET_FPE_FLTOVF;
                    break;
                case POWERPC_EXCP_FP_UX:
                    info.si_code = TARGET_FPE_FLTUND;
                    break;
                case POWERPC_EXCP_FP_ZX:
                case POWERPC_EXCP_FP_VXZDZ:
                    info.si_code = TARGET_FPE_FLTDIV;
                    break;
                case POWERPC_EXCP_FP_XX:
                    info.si_code = TARGET_FPE_FLTRES;
                    break;
                case POWERPC_EXCP_FP_VXSOFT:
                    info.si_code = TARGET_FPE_FLTINV;
                    break;
                case POWERPC_EXCP_FP_VXSNAN:
                case POWERPC_EXCP_FP_VXISI:
                case POWERPC_EXCP_FP_VXIDI:
                case POWERPC_EXCP_FP_VXIMZ:
                case POWERPC_EXCP_FP_VXVC:
                case POWERPC_EXCP_FP_VXSQRT:
                case POWERPC_EXCP_FP_VXCVI:
                    info.si_code = TARGET_FPE_FLTSUB;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown floating point exception (%02x)\n",
                              env->error_code);
                    break;
                }
                break;
            case POWERPC_EXCP_INVAL:
                EXCP_DUMP(env, "Invalid instruction\n");
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_INVAL_INVAL:
                    info.si_code = TARGET_ILL_ILLOPC;
                    break;
                case POWERPC_EXCP_INVAL_LSWX:
                    info.si_code = TARGET_ILL_ILLOPN;
                    break;
                case POWERPC_EXCP_INVAL_SPR:
                    info.si_code = TARGET_ILL_PRVREG;
                    break;
                case POWERPC_EXCP_INVAL_FP:
                    info.si_code = TARGET_ILL_COPROC;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown invalid operation (%02x)\n",
                              env->error_code & 0xF);
                    info.si_code = TARGET_ILL_ILLADR;
                    break;
                }
                break;
            case POWERPC_EXCP_PRIV:
                EXCP_DUMP(env, "Privilege violation\n");
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_PRIV_OPC:
                    info.si_code = TARGET_ILL_PRVOPC;
                    break;
                case POWERPC_EXCP_PRIV_REG:
                    info.si_code = TARGET_ILL_PRVREG;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown privilege violation (%02x)\n",
                              env->error_code & 0xF);
                    info.si_code = TARGET_ILL_PRVOPC;
                    break;
                }
                break;
            case POWERPC_EXCP_TRAP:
                cpu_abort(env, "Tried to call a TRAP\n");
                break;
            default:
                /* Should not happen ! */
                cpu_abort(env, "Unknown program exception (%02x)\n",
                          env->error_code);
                break;
            }
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_FPU:      /* Floating-point unavailable exception  */
            EXCP_DUMP(env, "No floating point allowed\n");
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_SYSCALL:  /* System call exception                 */
            cpu_abort(env, "Syscall exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_APU:      /* Auxiliary processor unavailable       */
            EXCP_DUMP(env, "No APU instruction allowed\n");
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_DECR:     /* Decrementer exception                 */
            cpu_abort(env, "Decrementer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_FIT:      /* Fixed-interval timer interrupt        */
            cpu_abort(env, "Fix interval timer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_WDT:      /* Watchdog timer interrupt              */
            cpu_abort(env, "Watchdog timer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DTLB:     /* Data TLB error                        */
            cpu_abort(env, "Data TLB exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ITLB:     /* Instruction TLB error                 */
            cpu_abort(env, "Instruction TLB exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_SPEU:     /* SPE/embedded floating-point unavail.  */
            EXCP_DUMP(env, "No SPE/floating-point instruction allowed\n");
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_EFPDI:    /* Embedded floating-point data IRQ      */
            cpu_abort(env, "Embedded floating-point data IRQ not handled\n");
            break;
        case POWERPC_EXCP_EFPRI:    /* Embedded floating-point round IRQ     */
            cpu_abort(env, "Embedded floating-point round IRQ not handled\n");
            break;
        case POWERPC_EXCP_EPERFM:   /* Embedded performance monitor IRQ      */
            cpu_abort(env, "Performance monitor exception not handled\n");
            break;
        case POWERPC_EXCP_DOORI:    /* Embedded doorbell interrupt           */
            cpu_abort(env, "Doorbell interrupt while in user mode. "
                       "Aborting\n");
            break;
        case POWERPC_EXCP_DOORCI:   /* Embedded doorbell critical interrupt  */
            cpu_abort(env, "Doorbell critical interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_RESET:    /* System reset exception                */
            cpu_abort(env, "Reset interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DSEG:     /* Data segment exception                */
            cpu_abort(env, "Data segment exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ISEG:     /* Instruction segment exception         */
            cpu_abort(env, "Instruction segment exception "
                      "while in user mode. Aborting\n");
            break;
        /* PowerPC 64 with hypervisor mode support */
        case POWERPC_EXCP_HDECR:    /* Hypervisor decrementer exception      */
            cpu_abort(env, "Hypervisor decrementer interrupt "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_TRACE:    /* Trace exception                       */
            /* Nothing to do:
             * we use this exception to emulate step-by-step execution mode.
             */
            break;
        /* PowerPC 64 with hypervisor mode support */
        case POWERPC_EXCP_HDSI:     /* Hypervisor data storage exception     */
            cpu_abort(env, "Hypervisor data storage exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HISI:     /* Hypervisor instruction storage excp   */
            cpu_abort(env, "Hypervisor instruction storage exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HDSEG:    /* Hypervisor data segment exception     */
            cpu_abort(env, "Hypervisor data segment exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HISEG:    /* Hypervisor instruction segment excp   */
            cpu_abort(env, "Hypervisor instruction segment exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_VPU:      /* Vector unavailable exception          */
            EXCP_DUMP(env, "No Altivec instructions allowed\n");
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, &info);
            break;
        case POWERPC_EXCP_PIT:      /* Programmable interval timer IRQ       */
            cpu_abort(env, "Programable interval timer interrupt "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_IO:       /* IO error exception                    */
            cpu_abort(env, "IO error exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_RUNM:     /* Run mode exception                    */
            cpu_abort(env, "Run mode exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_EMUL:     /* Emulation trap exception              */
            cpu_abort(env, "Emulation trap exception not handled\n");
            break;
        case POWERPC_EXCP_IFTLB:    /* Instruction fetch TLB error           */
            cpu_abort(env, "Instruction fetch TLB exception "
                      "while in user-mode. Aborting");
            break;
        case POWERPC_EXCP_DLTLB:    /* Data load TLB miss                    */
            cpu_abort(env, "Data load TLB exception while in user-mode. "
                      "Aborting");
            break;
        case POWERPC_EXCP_DSTLB:    /* Data store TLB miss                   */
            cpu_abort(env, "Data store TLB exception while in user-mode. "
                      "Aborting");
            break;
        case POWERPC_EXCP_FPA:      /* Floating-point assist exception       */
            cpu_abort(env, "Floating-point assist exception not handled\n");
            break;
        case POWERPC_EXCP_IABR:     /* Instruction address breakpoint        */
            cpu_abort(env, "Instruction address breakpoint exception "
                      "not handled\n");
            break;
        case POWERPC_EXCP_SMI:      /* System management interrupt           */
            cpu_abort(env, "System management interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_THERM:    /* Thermal interrupt                     */
            cpu_abort(env, "Thermal interrupt interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_PERFM:   /* Embedded performance monitor IRQ      */
            cpu_abort(env, "Performance monitor exception not handled\n");
            break;
        case POWERPC_EXCP_VPUA:     /* Vector assist exception               */
            cpu_abort(env, "Vector assist exception not handled\n");
            break;
        case POWERPC_EXCP_SOFTP:    /* Soft patch exception                  */
            cpu_abort(env, "Soft patch exception not handled\n");
            break;
        case POWERPC_EXCP_MAINT:    /* Maintenance exception                 */
            cpu_abort(env, "Maintenance exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_STOP:     /* stop translation                      */
            /* We did invalidate the instruction cache. Go on */
            break;
        case POWERPC_EXCP_BRANCH:   /* branch instruction:                   */
            /* We just stopped because of a branch. Go on */
            break;
        case POWERPC_EXCP_SYSCALL_USER:
            /* system call in user-mode emulation */
            /* WARNING:
             * PPC ABI uses overflow flag in cr0 to signal an error
             * in syscalls.
             */
#if 0
            printf("syscall %d 0x%08x 0x%08x 0x%08x 0x%08x\n", env->gpr[0],
                   env->gpr[3], env->gpr[4], env->gpr[5], env->gpr[6]);
#endif
            env->crf[0] &= ~0x1;
            ret = do_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
                             env->gpr[5], env->gpr[6], env->gpr[7],
                             env->gpr[8]);
            if (ret > (uint32_t)(-515)) {
                env->crf[0] |= 0x1;
                ret = -ret;
            }
            env->gpr[3] = ret;
#if 0
            printf("syscall returned 0x%08x (%d)\n", ret, ret);
#endif
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(env, TARGET_SIGTRAP);
                if (sig) {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        default:
            cpu_abort(env, "Unknown exception 0x%d. Aborting\n", trapnr);
            break;
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_MIPS

#define MIPS_SYS(name, args) args,

static const uint8_t mips_syscall_args[] = {
	MIPS_SYS(sys_syscall	, 0)	/* 4000 */
	MIPS_SYS(sys_exit	, 1)
	MIPS_SYS(sys_fork	, 0)
	MIPS_SYS(sys_read	, 3)
	MIPS_SYS(sys_write	, 3)
	MIPS_SYS(sys_open	, 3)	/* 4005 */
	MIPS_SYS(sys_close	, 1)
	MIPS_SYS(sys_waitpid	, 3)
	MIPS_SYS(sys_creat	, 2)
	MIPS_SYS(sys_link	, 2)
	MIPS_SYS(sys_unlink	, 1)	/* 4010 */
	MIPS_SYS(sys_execve	, 0)
	MIPS_SYS(sys_chdir	, 1)
	MIPS_SYS(sys_time	, 1)
	MIPS_SYS(sys_mknod	, 3)
	MIPS_SYS(sys_chmod	, 2)	/* 4015 */
	MIPS_SYS(sys_lchown	, 3)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_stat */
	MIPS_SYS(sys_lseek	, 3)
	MIPS_SYS(sys_getpid	, 0)	/* 4020 */
	MIPS_SYS(sys_mount	, 5)
	MIPS_SYS(sys_oldumount	, 1)
	MIPS_SYS(sys_setuid	, 1)
	MIPS_SYS(sys_getuid	, 0)
	MIPS_SYS(sys_stime	, 1)	/* 4025 */
	MIPS_SYS(sys_ptrace	, 4)
	MIPS_SYS(sys_alarm	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_fstat */
	MIPS_SYS(sys_pause	, 0)
	MIPS_SYS(sys_utime	, 2)	/* 4030 */
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_access	, 2)
	MIPS_SYS(sys_nice	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* 4035 */
	MIPS_SYS(sys_sync	, 0)
	MIPS_SYS(sys_kill	, 2)
	MIPS_SYS(sys_rename	, 2)
	MIPS_SYS(sys_mkdir	, 2)
	MIPS_SYS(sys_rmdir	, 1)	/* 4040 */
	MIPS_SYS(sys_dup		, 1)
	MIPS_SYS(sys_pipe	, 0)
	MIPS_SYS(sys_times	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_brk		, 1)	/* 4045 */
	MIPS_SYS(sys_setgid	, 1)
	MIPS_SYS(sys_getgid	, 0)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was signal(2) */
	MIPS_SYS(sys_geteuid	, 0)
	MIPS_SYS(sys_getegid	, 0)	/* 4050 */
	MIPS_SYS(sys_acct	, 0)
	MIPS_SYS(sys_umount	, 2)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_ioctl	, 3)
	MIPS_SYS(sys_fcntl	, 3)	/* 4055 */
	MIPS_SYS(sys_ni_syscall	, 2)
	MIPS_SYS(sys_setpgid	, 2)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_olduname	, 1)
	MIPS_SYS(sys_umask	, 1)	/* 4060 */
	MIPS_SYS(sys_chroot	, 1)
	MIPS_SYS(sys_ustat	, 2)
	MIPS_SYS(sys_dup2	, 2)
	MIPS_SYS(sys_getppid	, 0)
	MIPS_SYS(sys_getpgrp	, 0)	/* 4065 */
	MIPS_SYS(sys_setsid	, 0)
	MIPS_SYS(sys_sigaction	, 3)
	MIPS_SYS(sys_sgetmask	, 0)
	MIPS_SYS(sys_ssetmask	, 1)
	MIPS_SYS(sys_setreuid	, 2)	/* 4070 */
	MIPS_SYS(sys_setregid	, 2)
	MIPS_SYS(sys_sigsuspend	, 0)
	MIPS_SYS(sys_sigpending	, 1)
	MIPS_SYS(sys_sethostname	, 2)
	MIPS_SYS(sys_setrlimit	, 2)	/* 4075 */
	MIPS_SYS(sys_getrlimit	, 2)
	MIPS_SYS(sys_getrusage	, 2)
	MIPS_SYS(sys_gettimeofday, 2)
	MIPS_SYS(sys_settimeofday, 2)
	MIPS_SYS(sys_getgroups	, 2)	/* 4080 */
	MIPS_SYS(sys_setgroups	, 2)
	MIPS_SYS(sys_ni_syscall	, 0)	/* old_select */
	MIPS_SYS(sys_symlink	, 2)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_lstat */
	MIPS_SYS(sys_readlink	, 3)	/* 4085 */
	MIPS_SYS(sys_uselib	, 1)
	MIPS_SYS(sys_swapon	, 2)
	MIPS_SYS(sys_reboot	, 3)
	MIPS_SYS(old_readdir	, 3)
	MIPS_SYS(old_mmap	, 6)	/* 4090 */
	MIPS_SYS(sys_munmap	, 2)
	MIPS_SYS(sys_truncate	, 2)
	MIPS_SYS(sys_ftruncate	, 2)
	MIPS_SYS(sys_fchmod	, 2)
	MIPS_SYS(sys_fchown	, 3)	/* 4095 */
	MIPS_SYS(sys_getpriority	, 2)
	MIPS_SYS(sys_setpriority	, 3)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_statfs	, 2)
	MIPS_SYS(sys_fstatfs	, 2)	/* 4100 */
	MIPS_SYS(sys_ni_syscall	, 0)	/* was ioperm(2) */
	MIPS_SYS(sys_socketcall	, 2)
	MIPS_SYS(sys_syslog	, 3)
	MIPS_SYS(sys_setitimer	, 3)
	MIPS_SYS(sys_getitimer	, 2)	/* 4105 */
	MIPS_SYS(sys_newstat	, 2)
	MIPS_SYS(sys_newlstat	, 2)
	MIPS_SYS(sys_newfstat	, 2)
	MIPS_SYS(sys_uname	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* 4110 was iopl(2) */
	MIPS_SYS(sys_vhangup	, 0)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_idle() */
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_vm86 */
	MIPS_SYS(sys_wait4	, 4)
	MIPS_SYS(sys_swapoff	, 1)	/* 4115 */
	MIPS_SYS(sys_sysinfo	, 1)
	MIPS_SYS(sys_ipc		, 6)
	MIPS_SYS(sys_fsync	, 1)
	MIPS_SYS(sys_sigreturn	, 0)
	MIPS_SYS(sys_clone	, 0)	/* 4120 */
	MIPS_SYS(sys_setdomainname, 2)
	MIPS_SYS(sys_newuname	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* sys_modify_ldt */
	MIPS_SYS(sys_adjtimex	, 1)
	MIPS_SYS(sys_mprotect	, 3)	/* 4125 */
	MIPS_SYS(sys_sigprocmask	, 3)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was create_module */
	MIPS_SYS(sys_init_module	, 5)
	MIPS_SYS(sys_delete_module, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* 4130	was get_kernel_syms */
	MIPS_SYS(sys_quotactl	, 0)
	MIPS_SYS(sys_getpgid	, 1)
	MIPS_SYS(sys_fchdir	, 1)
	MIPS_SYS(sys_bdflush	, 2)
	MIPS_SYS(sys_sysfs	, 3)	/* 4135 */
	MIPS_SYS(sys_personality	, 1)
	MIPS_SYS(sys_ni_syscall	, 0)	/* for afs_syscall */
	MIPS_SYS(sys_setfsuid	, 1)
	MIPS_SYS(sys_setfsgid	, 1)
	MIPS_SYS(sys_llseek	, 5)	/* 4140 */
	MIPS_SYS(sys_getdents	, 3)
	MIPS_SYS(sys_select	, 5)
	MIPS_SYS(sys_flock	, 2)
	MIPS_SYS(sys_msync	, 3)
	MIPS_SYS(sys_readv	, 3)	/* 4145 */
	MIPS_SYS(sys_writev	, 3)
	MIPS_SYS(sys_cacheflush	, 3)
	MIPS_SYS(sys_cachectl	, 3)
	MIPS_SYS(sys_sysmips	, 4)
	MIPS_SYS(sys_ni_syscall	, 0)	/* 4150 */
	MIPS_SYS(sys_getsid	, 1)
	MIPS_SYS(sys_fdatasync	, 0)
	MIPS_SYS(sys_sysctl	, 1)
	MIPS_SYS(sys_mlock	, 2)
	MIPS_SYS(sys_munlock	, 2)	/* 4155 */
	MIPS_SYS(sys_mlockall	, 1)
	MIPS_SYS(sys_munlockall	, 0)
	MIPS_SYS(sys_sched_setparam, 2)
	MIPS_SYS(sys_sched_getparam, 2)
	MIPS_SYS(sys_sched_setscheduler, 3)	/* 4160 */
	MIPS_SYS(sys_sched_getscheduler, 1)
	MIPS_SYS(sys_sched_yield	, 0)
	MIPS_SYS(sys_sched_get_priority_max, 1)
	MIPS_SYS(sys_sched_get_priority_min, 1)
	MIPS_SYS(sys_sched_rr_get_interval, 2)	/* 4165 */
	MIPS_SYS(sys_nanosleep,	2)
	MIPS_SYS(sys_mremap	, 4)
	MIPS_SYS(sys_accept	, 3)
	MIPS_SYS(sys_bind	, 3)
	MIPS_SYS(sys_connect	, 3)	/* 4170 */
	MIPS_SYS(sys_getpeername	, 3)
	MIPS_SYS(sys_getsockname	, 3)
	MIPS_SYS(sys_getsockopt	, 5)
	MIPS_SYS(sys_listen	, 2)
	MIPS_SYS(sys_recv	, 4)	/* 4175 */
	MIPS_SYS(sys_recvfrom	, 6)
	MIPS_SYS(sys_recvmsg	, 3)
	MIPS_SYS(sys_send	, 4)
	MIPS_SYS(sys_sendmsg	, 3)
	MIPS_SYS(sys_sendto	, 6)	/* 4180 */
	MIPS_SYS(sys_setsockopt	, 5)
	MIPS_SYS(sys_shutdown	, 2)
	MIPS_SYS(sys_socket	, 3)
	MIPS_SYS(sys_socketpair	, 4)
	MIPS_SYS(sys_setresuid	, 3)	/* 4185 */
	MIPS_SYS(sys_getresuid	, 3)
	MIPS_SYS(sys_ni_syscall	, 0)	/* was sys_query_module */
	MIPS_SYS(sys_poll	, 3)
	MIPS_SYS(sys_nfsservctl	, 3)
	MIPS_SYS(sys_setresgid	, 3)	/* 4190 */
	MIPS_SYS(sys_getresgid	, 3)
	MIPS_SYS(sys_prctl	, 5)
	MIPS_SYS(sys_rt_sigreturn, 0)
	MIPS_SYS(sys_rt_sigaction, 4)
	MIPS_SYS(sys_rt_sigprocmask, 4)	/* 4195 */
	MIPS_SYS(sys_rt_sigpending, 2)
	MIPS_SYS(sys_rt_sigtimedwait, 4)
	MIPS_SYS(sys_rt_sigqueueinfo, 3)
	MIPS_SYS(sys_rt_sigsuspend, 0)
	MIPS_SYS(sys_pread64	, 6)	/* 4200 */
	MIPS_SYS(sys_pwrite64	, 6)
	MIPS_SYS(sys_chown	, 3)
	MIPS_SYS(sys_getcwd	, 2)
	MIPS_SYS(sys_capget	, 2)
	MIPS_SYS(sys_capset	, 2)	/* 4205 */
	MIPS_SYS(sys_sigaltstack	, 0)
	MIPS_SYS(sys_sendfile	, 4)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_mmap2	, 6)	/* 4210 */
	MIPS_SYS(sys_truncate64	, 4)
	MIPS_SYS(sys_ftruncate64	, 4)
	MIPS_SYS(sys_stat64	, 2)
	MIPS_SYS(sys_lstat64	, 2)
	MIPS_SYS(sys_fstat64	, 2)	/* 4215 */
	MIPS_SYS(sys_pivot_root	, 2)
	MIPS_SYS(sys_mincore	, 3)
	MIPS_SYS(sys_madvise	, 3)
	MIPS_SYS(sys_getdents64	, 3)
	MIPS_SYS(sys_fcntl64	, 3)	/* 4220 */
	MIPS_SYS(sys_ni_syscall	, 0)
	MIPS_SYS(sys_gettid	, 0)
	MIPS_SYS(sys_readahead	, 5)
	MIPS_SYS(sys_setxattr	, 5)
	MIPS_SYS(sys_lsetxattr	, 5)	/* 4225 */
	MIPS_SYS(sys_fsetxattr	, 5)
	MIPS_SYS(sys_getxattr	, 4)
	MIPS_SYS(sys_lgetxattr	, 4)
	MIPS_SYS(sys_fgetxattr	, 4)
	MIPS_SYS(sys_listxattr	, 3)	/* 4230 */
	MIPS_SYS(sys_llistxattr	, 3)
	MIPS_SYS(sys_flistxattr	, 3)
	MIPS_SYS(sys_removexattr	, 2)
	MIPS_SYS(sys_lremovexattr, 2)
	MIPS_SYS(sys_fremovexattr, 2)	/* 4235 */
	MIPS_SYS(sys_tkill	, 2)
	MIPS_SYS(sys_sendfile64	, 5)
	MIPS_SYS(sys_futex	, 2)
	MIPS_SYS(sys_sched_setaffinity, 3)
	MIPS_SYS(sys_sched_getaffinity, 3)	/* 4240 */
	MIPS_SYS(sys_io_setup	, 2)
	MIPS_SYS(sys_io_destroy	, 1)
	MIPS_SYS(sys_io_getevents, 5)
	MIPS_SYS(sys_io_submit	, 3)
	MIPS_SYS(sys_io_cancel	, 3)	/* 4245 */
	MIPS_SYS(sys_exit_group	, 1)
	MIPS_SYS(sys_lookup_dcookie, 3)
	MIPS_SYS(sys_epoll_create, 1)
	MIPS_SYS(sys_epoll_ctl	, 4)
	MIPS_SYS(sys_epoll_wait	, 3)	/* 4250 */
	MIPS_SYS(sys_remap_file_pages, 5)
	MIPS_SYS(sys_set_tid_address, 1)
	MIPS_SYS(sys_restart_syscall, 0)
	MIPS_SYS(sys_fadvise64_64, 7)
	MIPS_SYS(sys_statfs64	, 3)	/* 4255 */
	MIPS_SYS(sys_fstatfs64	, 2)
	MIPS_SYS(sys_timer_create, 3)
	MIPS_SYS(sys_timer_settime, 4)
	MIPS_SYS(sys_timer_gettime, 2)
	MIPS_SYS(sys_timer_getoverrun, 1)	/* 4260 */
	MIPS_SYS(sys_timer_delete, 1)
	MIPS_SYS(sys_clock_settime, 2)
	MIPS_SYS(sys_clock_gettime, 2)
	MIPS_SYS(sys_clock_getres, 2)
	MIPS_SYS(sys_clock_nanosleep, 4)	/* 4265 */
	MIPS_SYS(sys_tgkill	, 3)
	MIPS_SYS(sys_utimes	, 2)
	MIPS_SYS(sys_mbind	, 4)
	MIPS_SYS(sys_ni_syscall	, 0)	/* sys_get_mempolicy */
	MIPS_SYS(sys_ni_syscall	, 0)	/* 4270 sys_set_mempolicy */
	MIPS_SYS(sys_mq_open	, 4)
	MIPS_SYS(sys_mq_unlink	, 1)
	MIPS_SYS(sys_mq_timedsend, 5)
	MIPS_SYS(sys_mq_timedreceive, 5)
	MIPS_SYS(sys_mq_notify	, 2)	/* 4275 */
	MIPS_SYS(sys_mq_getsetattr, 3)
	MIPS_SYS(sys_ni_syscall	, 0)	/* sys_vserver */
	MIPS_SYS(sys_waitid	, 4)
	MIPS_SYS(sys_ni_syscall	, 0)	/* available, was setaltroot */
	MIPS_SYS(sys_add_key	, 5)
	MIPS_SYS(sys_request_key, 4)
	MIPS_SYS(sys_keyctl	, 5)
	MIPS_SYS(sys_set_thread_area, 1)
	MIPS_SYS(sys_inotify_init, 0)
	MIPS_SYS(sys_inotify_add_watch, 3) /* 4285 */
	MIPS_SYS(sys_inotify_rm_watch, 2)
	MIPS_SYS(sys_migrate_pages, 4)
	MIPS_SYS(sys_openat, 4)
	MIPS_SYS(sys_mkdirat, 3)
	MIPS_SYS(sys_mknodat, 4)	/* 4290 */
	MIPS_SYS(sys_fchownat, 5)
	MIPS_SYS(sys_futimesat, 3)
	MIPS_SYS(sys_fstatat64, 4)
	MIPS_SYS(sys_unlinkat, 3)
	MIPS_SYS(sys_renameat, 4)	/* 4295 */
	MIPS_SYS(sys_linkat, 5)
	MIPS_SYS(sys_symlinkat, 3)
	MIPS_SYS(sys_readlinkat, 4)
	MIPS_SYS(sys_fchmodat, 3)
	MIPS_SYS(sys_faccessat, 3)	/* 4300 */
	MIPS_SYS(sys_pselect6, 6)
	MIPS_SYS(sys_ppoll, 5)
	MIPS_SYS(sys_unshare, 1)
	MIPS_SYS(sys_splice, 4)
	MIPS_SYS(sys_sync_file_range, 7) /* 4305 */
	MIPS_SYS(sys_tee, 4)
	MIPS_SYS(sys_vmsplice, 4)
	MIPS_SYS(sys_move_pages, 6)
	MIPS_SYS(sys_set_robust_list, 2)
	MIPS_SYS(sys_get_robust_list, 3) /* 4310 */
	MIPS_SYS(sys_kexec_load, 4)
	MIPS_SYS(sys_getcpu, 3)
	MIPS_SYS(sys_epoll_pwait, 6)
	MIPS_SYS(sys_ioprio_set, 3)
	MIPS_SYS(sys_ioprio_get, 2)
};

#undef MIPS_SYS

void cpu_loop(CPUMIPSState *env)
{
    target_siginfo_t info;
    int trapnr, ret;
    unsigned int syscall_num;

    for(;;) {
        trapnr = cpu_mips_exec(env);
        switch(trapnr) {
        case EXCP_SYSCALL:
            syscall_num = env->active_tc.gpr[2] - 4000;
            env->active_tc.PC += 4;
            if (syscall_num >= sizeof(mips_syscall_args)) {
                ret = -ENOSYS;
            } else {
                int nb_args;
                abi_ulong sp_reg;
                abi_ulong arg5 = 0, arg6 = 0, arg7 = 0, arg8 = 0;

                nb_args = mips_syscall_args[syscall_num];
                sp_reg = env->active_tc.gpr[29];
                switch (nb_args) {
                /* these arguments are taken from the stack */
                /* FIXME - what to do if get_user() fails? */
                case 8: get_user_ual(arg8, sp_reg + 28);
                case 7: get_user_ual(arg7, sp_reg + 24);
                case 6: get_user_ual(arg6, sp_reg + 20);
                case 5: get_user_ual(arg5, sp_reg + 16);
                default:
                    break;
                }
                ret = do_syscall(env, env->active_tc.gpr[2],
                                 env->active_tc.gpr[4],
                                 env->active_tc.gpr[5],
                                 env->active_tc.gpr[6],
                                 env->active_tc.gpr[7],
                                 arg5, arg6/*, arg7, arg8*/);
            }
            if ((unsigned int)ret >= (unsigned int)(-1133)) {
                env->active_tc.gpr[7] = 1; /* error flag */
                ret = -ret;
            } else {
                env->active_tc.gpr[7] = 0; /* error flag */
            }
            env->active_tc.gpr[2] = ret;
            break;
        case EXCP_TLBL:
        case EXCP_TLBS:
        case EXCP_CpU:
        case EXCP_RI:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = 0;
            queue_signal(env, info.si_signo, &info);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            //        error:
            fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
                    trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_SH4
void cpu_loop (CPUState *env)
{
    int trapnr, ret;
    target_siginfo_t info;

    while (1) {
        trapnr = cpu_sh4_exec (env);

        switch (trapnr) {
        case 0x160:
            env->pc += 2;
            ret = do_syscall(env,
                             env->gregs[3],
                             env->gregs[4],
                             env->gregs[5],
                             env->gregs[6],
                             env->gregs[7],
                             env->gregs[0],
                             env->gregs[1]);
            env->gregs[0] = ret;
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
	case 0xa0:
	case 0xc0:
            info.si_signo = SIGSEGV;
            info.si_errno = 0;
            info.si_code = TARGET_SEGV_MAPERR;
            info._sifields._sigfault._addr = env->tea;
            queue_signal(env, info.si_signo, &info);
	    break;

        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            exit (1);
        }
        process_pending_signals (env);
    }
}
#endif

#ifdef TARGET_CRIS
void cpu_loop (CPUState *env)
{
    int trapnr, ret;
    target_siginfo_t info;
    
    while (1) {
        trapnr = cpu_cris_exec (env);
        switch (trapnr) {
        case 0xaa:
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->pregs[PR_EDA];
                queue_signal(env, info.si_signo, &info);
            }
            break;
	case EXCP_INTERRUPT:
	  /* just indicate that signals should be handled asap */
	  break;
        case EXCP_BREAK:
            ret = do_syscall(env, 
                             env->regs[9], 
                             env->regs[10], 
                             env->regs[11], 
                             env->regs[12], 
                             env->regs[13], 
                             env->pregs[7], 
                             env->pregs[11]);
            env->regs[10] = ret;
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            exit (1);
        }
        process_pending_signals (env);
    }
}
#endif

#ifdef TARGET_M68K

void cpu_loop(CPUM68KState *env)
{
    int trapnr;
    unsigned int n;
    target_siginfo_t info;
    TaskState *ts = env->opaque;

    for(;;) {
        trapnr = cpu_m68k_exec(env);
        switch(trapnr) {
        case EXCP_ILLEGAL:
            {
                if (ts->sim_syscalls) {
                    uint16_t nr;
                    nr = lduw(env->pc + 2);
                    env->pc += 4;
                    do_m68k_simcall(env, nr);
                } else {
                    goto do_sigill;
                }
            }
            break;
        case EXCP_HALT_INSN:
            /* Semihosing syscall.  */
            env->pc += 4;
            do_m68k_semihosting(env, env->dregs[0]);
            break;
        case EXCP_LINEA:
        case EXCP_LINEF:
        case EXCP_UNSUPPORTED:
        do_sigill:
            info.si_signo = SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPN;
            info._sifields._sigfault._addr = env->pc;
            queue_signal(env, info.si_signo, &info);
            break;
        case EXCP_TRAP0:
            {
                ts->sim_syscalls = 0;
                n = env->dregs[0];
                env->pc += 2;
                env->dregs[0] = do_syscall(env,
                                          n,
                                          env->dregs[1],
                                          env->dregs[2],
                                          env->dregs[3],
                                          env->dregs[4],
                                          env->dregs[5],
                                          env->aregs[0]);
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_ACCESS:
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->mmu.ar;
                queue_signal(env, info.si_signo, &info);
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
                    trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif /* TARGET_M68K */

#ifdef TARGET_ALPHA
void cpu_loop (CPUState *env)
{
    int trapnr;
    target_siginfo_t info;

    while (1) {
        trapnr = cpu_alpha_exec (env);

        switch (trapnr) {
        case EXCP_RESET:
            fprintf(stderr, "Reset requested. Exit\n");
            exit(1);
            break;
        case EXCP_MCHK:
            fprintf(stderr, "Machine check exception. Exit\n");
            exit(1);
            break;
        case EXCP_ARITH:
            fprintf(stderr, "Arithmetic trap.\n");
            exit(1);
            break;
        case EXCP_HW_INTERRUPT:
            fprintf(stderr, "External interrupt. Exit\n");
            exit(1);
            break;
        case EXCP_DFAULT:
            fprintf(stderr, "MMU data fault\n");
            exit(1);
            break;
        case EXCP_DTB_MISS_PAL:
            fprintf(stderr, "MMU data TLB miss in PALcode\n");
            exit(1);
            break;
        case EXCP_ITB_MISS:
            fprintf(stderr, "MMU instruction TLB miss\n");
            exit(1);
            break;
        case EXCP_ITB_ACV:
            fprintf(stderr, "MMU instruction access violation\n");
            exit(1);
            break;
        case EXCP_DTB_MISS_NATIVE:
            fprintf(stderr, "MMU data TLB miss\n");
            exit(1);
            break;
        case EXCP_UNALIGN:
            fprintf(stderr, "Unaligned access\n");
            exit(1);
            break;
        case EXCP_OPCDEC:
            fprintf(stderr, "Invalid instruction\n");
            exit(1);
            break;
        case EXCP_FEN:
            fprintf(stderr, "Floating-point not allowed\n");
            exit(1);
            break;
        case EXCP_CALL_PAL ... (EXCP_CALL_PALP - 1):
            call_pal(env, (trapnr >> 6) | 0x80);
            break;
        case EXCP_CALL_PALP ... (EXCP_CALL_PALE - 1):
            fprintf(stderr, "Privileged call to PALcode\n");
            exit(1);
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, &info);
                  }
            }
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            exit (1);
        }
        process_pending_signals (env);
    }
}
#endif /* TARGET_ALPHA */

static void print_version(void)
{
    printf("qemu-" TARGET_ARCH " version " QEMU_VERSION QEMU_PKGVERSION
           ", Copyright (c) 2003-2008 Fabrice Bellard, 2008 CodeSourcery\n");
}

void usage(int retcode)
{
    print_version();
    printf("usage: qemu-" TARGET_ARCH " [options] program [arguments...]\n"
           "Linux CPU emulator (compiled for %s emulation)\n"
           "\n"
           "Standard options:\n"
           "-h                print this help\n"
           "-g port           wait gdb connection to port\n"
           "-L path           set the elf interpreter prefix (default=%s)\n"
	   "-r version        set the kernel version reported to application\n"
           "-s size           set the stack size in bytes (default=%ld)\n"
           "-cpu model        select CPU (-cpu ? for list)\n"
           "-drop-ld-preload  drop LD_PRELOAD for target process\n"
           "-wrapper wrapper  run a wrapper before gdb connects\n"
           "\n"
           "Debug options:\n"
           "-d options   activate log (logfile=%s)\n"
           "-p pagesize  set the host page size to 'pagesize'\n"
           "-strace      log system calls\n"
           "\n"
           "Environment variables:\n"
           "QEMU_STRACE       Print system calls and arguments similar to the\n"
           "                  'strace' program.  Enable by setting to any value.\n"
#ifdef QEMU_BUGURL
           "\n"
           "For bug reporting instructions, please see:\n"
           QEMU_BUGURL "\n"
#endif
           ,
           TARGET_ARCH,
           interp_prefix,
           x86_stack_size,
           DEBUG_LOGFILE);
    exit(retcode);
}

THREAD CPUState *thread_env;

/* Assumes contents are already zeroed.  */
void init_task_state(TaskState *ts)
{
    int i;
 
    ts->used = 1;
    ts->first_free = ts->sigqueue_table;
    for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
        ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
    }
    ts->sigqueue_table[i].next = NULL;
}
 
int main(int argc, char **argv, char **envp)
{
    const char *filename;
    const char *cpu_model;
    struct target_pt_regs regs1, *regs = &regs1;
    struct image_info info1, *info = &info1;
    TaskState ts1, *ts = &ts1;
    CPUState *env;
    int optind;
    const char *r;
    int gdbstub_port = 0;
    char *gdb_wrapper_prog;
    int drop_ld_preload = 0, environ_count = 0;
    char **target_environ, **wrk, **dst;

    if (argc <= 1)
        usage(1);

#ifndef CONFIG_STATIC
    if (RESERVED_SEGMENT_SIZE > 0)
        munmap((void *)RESERVED_SEGMENT_START, RESERVED_SEGMENT_SIZE);
    if (RESERVED2_SEGMENT_SIZE > 0)
        munmap((void *)RESERVED2_SEGMENT_START, RESERVED2_SEGMENT_SIZE);
#endif
    qemu_cache_utils_init(envp);

    /* init debug */
    cpu_set_log_filename(DEBUG_LOGFILE);

    cpu_model = NULL;
    optind = 1;
    for(;;) {
        if (optind >= argc)
            break;
        r = argv[optind];
        if (r[0] != '-')
            break;
        optind++;
        r++;
        if (!strcmp(r, "-"))
            break;
        /* Accept --foo as an alias for -foo.  */
        if (r[0] == '-')
          r++;
        if (!strcmp(r, "d")) {
            int mask;
            const CPULogItem *item;

	    if (optind >= argc)
		break;

	    r = argv[optind++];
            mask = cpu_str_to_log_mask(r);
            if (!mask) {
                printf("Log items (comma separated):\n");
                for(item = cpu_log_items; item->mask != 0; item++) {
                    printf("%-10s %s\n", item->name, item->help);
                }
                exit(1);
            }
            cpu_set_log(mask);
        } else if (!strcmp(r, "s")) {
            r = argv[optind++];
            x86_stack_size = strtol(r, (char **)&r, 0);
            if (x86_stack_size <= 0)
                usage(1);
            if (*r == 'M')
                x86_stack_size *= 1024 * 1024;
            else if (*r == 'k' || *r == 'K')
                x86_stack_size *= 1024;
        } else if (!strcmp(r, "L")) {
            interp_prefix = argv[optind++];
        } else if (!strcmp(r, "p")) {
            qemu_host_page_size = atoi(argv[optind++]);
            if (qemu_host_page_size == 0 ||
                (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
                fprintf(stderr, "page size must be a power of two\n");
                exit(1);
            }
        } else if (!strcmp(r, "g")) {
            gdbstub_port = atoi(argv[optind++]);
	} else if (!strcmp(r, "r")) {
	    qemu_uname_release = argv[optind++];
        } else if (!strcmp(r, "cpu")) {
            cpu_model = argv[optind++];
            if (strcmp(cpu_model, "?") == 0) {
/* XXX: implement xxx_cpu_list for targets that still miss it */
#if defined(cpu_list)
                    cpu_list(stdout, &fprintf);
#endif
                _exit(1);
            }
        } else if (!strcmp(r, "drop-ld-preload")) {
            drop_ld_preload = 1;
        } else if (!strcmp(r, "wrapper")) {
            gdb_wrapper = 1;
            gdb_wrapper_prog = argv[optind++];
        } else if (!strcmp(r, "strace")) {
            do_strace = 1;
        } else if (!strcmp(r, "missing-syscalls")) {
            show_missing_syscalls = 1;
        } else if (!strcmp(r, "help")) {
            usage(0);
        } else if (!strcmp(r, "version")) {
            print_version();
            exit(0);
        } else
        {
            usage(1);
        }
    }
    if (optind >= argc)
        usage(1);
    if (gdb_wrapper_prog)
        /* We're done with argv so just stick the wrapper at the
           beginning of the real program.  */
        argv[--optind] = gdb_wrapper_prog;

    filename = argv[optind];

    /* Zero out regs */
    memset(regs, 0, sizeof(struct target_pt_regs));

    /* Zero out image_info */
    memset(info, 0, sizeof(struct image_info));

    /* Scan interp_prefix dir for replacement files. */
    init_paths(interp_prefix);

    if (cpu_model == NULL) {
#if defined(TARGET_I386)
#ifdef TARGET_X86_64
        cpu_model = "qemu64";
#else
        cpu_model = "qemu32";
#endif
#elif defined(TARGET_ARM)
        cpu_model = "any";
#elif defined(TARGET_M68K)
        cpu_model = "any";
#elif defined(TARGET_SPARC)
#ifdef TARGET_SPARC64
        cpu_model = "TI UltraSparc II";
#else
        cpu_model = "Fujitsu MB86904";
#endif
#elif defined(TARGET_MIPS)
#if defined(TARGET_ABI_MIPSN32) || defined(TARGET_ABI_MIPSN64)
        cpu_model = "20Kc";
#else
        cpu_model = "24Kf";
#endif
#elif defined(TARGET_PPC)
#ifdef TARGET_PPC64
        cpu_model = "970";
#else
        cpu_model = "750";
#endif
#else
        cpu_model = "any";
#endif
    }
    cpu_exec_init_all(0);
    /* NOTE: we need to init the CPU at this stage to get
       qemu_host_page_size */
    env = cpu_init(cpu_model);
    if (!env) {
        fprintf(stderr, "Unable to find CPU definition\n");
        exit(1);
    }
    thread_env = env;

    if (getenv("QEMU_STRACE")) {
        do_strace = 1;
    }

    wrk = environ;
    while (*(wrk++))
        environ_count++;

    target_environ = malloc((environ_count + 1) * sizeof(char *));
    if (!target_environ)
        abort();
    for (wrk = environ, dst = target_environ; *wrk; wrk++) {
        if (drop_ld_preload && !strncmp(*wrk, "LD_PRELOAD=", 11))
            continue;
        *(dst++) = strdup(*wrk);
    }
    *dst = NULL; /* NULL terminate target_environ */

    if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
        printf("Error loading %s\n", filename);
        _exit(1);
    }

    for (wrk = target_environ; *wrk; wrk++) {
        free(*wrk);
    }

    free(target_environ);

    if (loglevel) {
        page_dump(logfile);

        fprintf(logfile, "start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
        fprintf(logfile, "end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
        fprintf(logfile, "start_code  0x" TARGET_ABI_FMT_lx "\n",
                info->start_code);
        fprintf(logfile, "start_data  0x" TARGET_ABI_FMT_lx "\n",
                info->start_data);
        fprintf(logfile, "end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
        fprintf(logfile, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
                info->start_stack);
        fprintf(logfile, "brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
        fprintf(logfile, "entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
    }

    target_set_brk(info->brk);
    syscall_init();
    signal_init();

    /* build Task State */
    memset(ts, 0, sizeof(TaskState));
    init_task_state(ts);
    ts->info = info;
    env->opaque = ts;
    env->user_mode_only = 1;

#if defined(TARGET_I386)
    cpu_x86_set_cpl(env, 3);

    env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
    env->hflags |= HF_PE_MASK;
    if (env->cpuid_features & CPUID_SSE) {
        env->cr[4] |= CR4_OSFXSR_MASK;
        env->hflags |= HF_OSFXSR_MASK;
    }
#ifndef TARGET_ABI32
    /* enable 64 bit mode if possible */
    if (!(env->cpuid_ext2_features & CPUID_EXT2_LM)) {
        fprintf(stderr, "The selected x86 CPU does not support 64 bit mode\n");
        exit(1);
    }
    env->cr[4] |= CR4_PAE_MASK;
    env->efer |= MSR_EFER_LMA | MSR_EFER_LME;
    env->hflags |= HF_LMA_MASK;
#endif

    /* flags setup : we activate the IRQs by default as in user mode */
    env->eflags |= IF_MASK;

    /* linux register setup */
#ifndef TARGET_ABI32
    env->regs[R_EAX] = regs->rax;
    env->regs[R_EBX] = regs->rbx;
    env->regs[R_ECX] = regs->rcx;
    env->regs[R_EDX] = regs->rdx;
    env->regs[R_ESI] = regs->rsi;
    env->regs[R_EDI] = regs->rdi;
    env->regs[R_EBP] = regs->rbp;
    env->regs[R_ESP] = regs->rsp;
    env->eip = regs->rip;
#else
    env->regs[R_EAX] = regs->eax;
    env->regs[R_EBX] = regs->ebx;
    env->regs[R_ECX] = regs->ecx;
    env->regs[R_EDX] = regs->edx;
    env->regs[R_ESI] = regs->esi;
    env->regs[R_EDI] = regs->edi;
    env->regs[R_EBP] = regs->ebp;
    env->regs[R_ESP] = regs->esp;
    env->eip = regs->eip;
#endif

    /* linux interrupt setup */
#ifndef TARGET_ABI32
    env->idt.limit = 511;
#else
    env->idt.limit = 255;
#endif
    env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
                                PROT_READ|PROT_WRITE,
                                MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
    idt_table = g2h(env->idt.base);
    set_idt(0, 0);
    set_idt(1, 0);
    set_idt(2, 0);
    set_idt(3, 3);
    set_idt(4, 3);
    set_idt(5, 0);
    set_idt(6, 0);
    set_idt(7, 0);
    set_idt(8, 0);
    set_idt(9, 0);
    set_idt(10, 0);
    set_idt(11, 0);
    set_idt(12, 0);
    set_idt(13, 0);
    set_idt(14, 0);
    set_idt(15, 0);
    set_idt(16, 0);
    set_idt(17, 0);
    set_idt(18, 0);
    set_idt(19, 0);
    set_idt(0x80, 3);

    /* linux segment setup */
    {
        uint64_t *gdt_table;
        env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
                                    PROT_READ|PROT_WRITE,
                                    MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
        env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
        gdt_table = g2h(env->gdt.base);
#ifdef TARGET_ABI32
        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
#else
        /* 64 bit code segment */
        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 DESC_L_MASK |
                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
#endif
        write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
    }
    cpu_x86_load_seg(env, R_CS, __USER_CS);
    cpu_x86_load_seg(env, R_SS, __USER_DS);
#ifdef TARGET_ABI32
    cpu_x86_load_seg(env, R_DS, __USER_DS);
    cpu_x86_load_seg(env, R_ES, __USER_DS);
    cpu_x86_load_seg(env, R_FS, __USER_DS);
    cpu_x86_load_seg(env, R_GS, __USER_DS);
    /* This hack makes Wine work... */
    env->segs[R_FS].selector = 0;
#else
    cpu_x86_load_seg(env, R_DS, 0);
    cpu_x86_load_seg(env, R_ES, 0);
    cpu_x86_load_seg(env, R_FS, 0);
    cpu_x86_load_seg(env, R_GS, 0);
#endif
#elif defined(TARGET_ARM)
    {
        int i;
        cpsr_write(env, regs->uregs[16], 0xffffffff);
        for(i = 0; i < 16; i++) {
            env->regs[i] = regs->uregs[i];
        }
        /* Register the magic kernel code page.  The cpu will generate a
           special exception when it tries to execute code here.  We can't
           put real code here because it may be in use by the host kernel.  */
        page_set_flags(0xffff0000, 0xffff0fff, 0);
    }
    /* Enable BE8.  */
    if ((info->elf_flags >> 24) >= 4 && (info->elf_flags & 0x800000)) {
        env->bswap_code = 1;
    }
#elif defined(TARGET_SPARC)
    {
        int i;
	env->pc = regs->pc;
	env->npc = regs->npc;
        env->y = regs->y;
        for(i = 0; i < 8; i++)
            env->gregs[i] = regs->u_regs[i];
        for(i = 0; i < 8; i++)
            env->regwptr[i] = regs->u_regs[i + 8];
    }
#elif defined(TARGET_PPC)
    {
        int i;

#if defined(TARGET_PPC64)
#if defined(TARGET_ABI32)
        env->msr &= ~((target_ulong)1 << MSR_SF);
#else
        env->msr |= (target_ulong)1 << MSR_SF;
#endif
#endif
        env->nip = regs->nip;
        for(i = 0; i < 32; i++) {
            env->gpr[i] = regs->gpr[i];
        }
    }
#elif defined(TARGET_M68K)
    {
        env->pc = regs->pc;
        env->dregs[0] = regs->d0;
        env->dregs[1] = regs->d1;
        env->dregs[2] = regs->d2;
        env->dregs[3] = regs->d3;
        env->dregs[4] = regs->d4;
        env->dregs[5] = regs->d5;
        env->dregs[6] = regs->d6;
        env->dregs[7] = regs->d7;
        env->aregs[0] = regs->a0;
        env->aregs[1] = regs->a1;
        env->aregs[2] = regs->a2;
        env->aregs[3] = regs->a3;
        env->aregs[4] = regs->a4;
        env->aregs[5] = regs->a5;
        env->aregs[6] = regs->a6;
        env->aregs[7] = regs->usp;
        env->sr = regs->sr;
        ts->sim_syscalls = 1;
    }
#elif defined(TARGET_MIPS)
    {
        int i;

        for(i = 0; i < 32; i++) {
            env->active_tc.gpr[i] = regs->regs[i];
        }
        env->active_tc.PC = regs->cp0_epc;
    }
#elif defined(TARGET_SH4)
    {
        int i;

        for(i = 0; i < 16; i++) {
            env->gregs[i] = regs->regs[i];
        }
        env->pc = regs->pc;
    }
#elif defined(TARGET_ALPHA)
    {
        int i;

        for(i = 0; i < 28; i++) {
            env->ir[i] = ((abi_ulong *)regs)[i];
        }
        env->ipr[IPR_USP] = regs->usp;
        env->ir[30] = regs->usp;
        env->pc = regs->pc;
        env->unique = regs->unique;
    }
#elif defined(TARGET_CRIS)
    {
	    env->regs[0] = regs->r0;
	    env->regs[1] = regs->r1;
	    env->regs[2] = regs->r2;
	    env->regs[3] = regs->r3;
	    env->regs[4] = regs->r4;
	    env->regs[5] = regs->r5;
	    env->regs[6] = regs->r6;
	    env->regs[7] = regs->r7;
	    env->regs[8] = regs->r8;
	    env->regs[9] = regs->r9;
	    env->regs[10] = regs->r10;
	    env->regs[11] = regs->r11;
	    env->regs[12] = regs->r12;
	    env->regs[13] = regs->r13;
	    env->regs[14] = info->start_stack;
	    env->regs[15] = regs->acr;	    
	    env->pc = regs->erp;
    }
#else
#error unsupported target CPU
#endif

#if defined(TARGET_ARM) || defined(TARGET_M68K)
    ts->stack_base = info->start_stack;
    ts->heap_base = info->brk;
    /* This will be filled in on the first SYS_HEAPINFO call.  */
    ts->heap_limit = 0;
#endif

    if (gdb_wrapper && gdbstub_port) {
        gdb_wrapper = gdbstub_port;
    } else if (gdb_wrapper) {
        gdb_wrapper = 0;
    } else if (gdbstub_port) {
        gdbserver_start (gdbstub_port);
        gdb_handlesig(env, 0);
    }
    cpu_loop(env);
    /* never exits */
    return 0;
}
