Fix for Bug 3671 - QEMU GDB stub listens on IPv6-only port on Windows 7
The connection string used by the GDB stub does not specify which
version of the Internet Protocol should be used by the port on
which it listens. On host platforms with IPv6 support, such as
Windows 7, this means that the stub listens on an IPv6-only port.
Since the GDB client uses IPv4, this means that the client cannot
connect to QEMU.
/*
* Arm "Angel" semihosting syscalls
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Written by Paul Brook.
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "cpu.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "qemu-common.h"
#include "sysemu.h"
#include "gdbstub.h"
#endif
#define SYS_OPEN 0x01
#define SYS_CLOSE 0x02
#define SYS_WRITEC 0x03
#define SYS_WRITE0 0x04
#define SYS_WRITE 0x05
#define SYS_READ 0x06
#define SYS_READC 0x07
#define SYS_ISTTY 0x09
#define SYS_SEEK 0x0a
#define SYS_FLEN 0x0c
#define SYS_TMPNAM 0x0d
#define SYS_REMOVE 0x0e
#define SYS_RENAME 0x0f
#define SYS_CLOCK 0x10
#define SYS_TIME 0x11
#define SYS_SYSTEM 0x12
#define SYS_ERRNO 0x13
#define SYS_GET_CMDLINE 0x15
#define SYS_HEAPINFO 0x16
#define SYS_EXIT 0x18
#ifndef O_BINARY
#define O_BINARY 0
#endif
#define GDB_O_RDONLY 0x000
#define GDB_O_WRONLY 0x001
#define GDB_O_RDWR 0x002
#define GDB_O_APPEND 0x008
#define GDB_O_CREAT 0x200
#define GDB_O_TRUNC 0x400
#define GDB_O_BINARY 0
static int gdb_open_modeflags[12] = {
GDB_O_RDONLY,
GDB_O_RDONLY | GDB_O_BINARY,
GDB_O_RDWR,
GDB_O_RDWR | GDB_O_BINARY,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
};
static int open_modeflags[12] = {
O_RDONLY,
O_RDONLY | O_BINARY,
O_RDWR,
O_RDWR | O_BINARY,
O_WRONLY | O_CREAT | O_TRUNC,
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
O_RDWR | O_CREAT | O_TRUNC,
O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
O_WRONLY | O_CREAT | O_APPEND,
O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
O_RDWR | O_CREAT | O_APPEND,
O_RDWR | O_CREAT | O_APPEND | O_BINARY
};
#ifdef CONFIG_USER_ONLY
static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
{
if (code == (uint32_t)-1)
ts->swi_errno = errno;
return code;
}
#else
static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
{
return code;
}
#include "softmmu-semi.h"
#endif
static target_ulong arm_semi_syscall_len;
#if !defined(CONFIG_USER_ONLY)
static target_ulong syscall_err;
#endif
static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
{
#ifdef CONFIG_USER_ONLY
TaskState *ts = env->opaque;
#endif
if (ret == (target_ulong)-1) {
#ifdef CONFIG_USER_ONLY
ts->swi_errno = err;
#else
syscall_err = err;
#endif
env->regs[0] = ret;
} else {
/* Fixup syscalls that use nonstardard return conventions. */
switch (env->regs[0]) {
case SYS_WRITE:
case SYS_READ:
env->regs[0] = arm_semi_syscall_len - ret;
break;
case SYS_SEEK:
env->regs[0] = 0;
break;
default:
env->regs[0] = ret;
break;
}
}
}
static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
{
/* The size is always stored in big-endian order, extract
the value. We assume the size always fit in 32 bits. */
uint32_t size;
cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
env->regs[0] = be32_to_cpu(size);
#ifdef CONFIG_USER_ONLY
((TaskState *)env->opaque)->swi_errno = err;
#else
syscall_err = err;
#endif
}
#define ARG(n) \
({ \
target_ulong __arg; \
/* FIXME - handle get_user() failure */ \
get_user_ual(__arg, args + (n) * 4); \
__arg; \
})
#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
uint32_t do_arm_semihosting(CPUState *env)
{
target_ulong args;
char * s;
int nr;
uint32_t ret;
uint32_t len;
#ifdef CONFIG_USER_ONLY
TaskState *ts = env->opaque;
#else
CPUState *ts = env;
#endif
nr = env->regs[0];
args = env->regs[1];
switch (nr) {
case SYS_OPEN:
if (!(s = lock_user_string(ARG(0))))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
if (ARG(1) >= 12)
return (uint32_t)-1;
if (strcmp(s, ":tt") == 0) {
if (ARG(1) < 4)
return STDIN_FILENO;
else
return STDOUT_FILENO;
}
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
(int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
return env->regs[0];
} else {
ret = uninterrupted_open(s, open_modeflags[ARG(1)], 0644);
ret = set_swi_errno(ts, ret);
}
unlock_user(s, ARG(0), 0);
return ret;
case SYS_CLOSE:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
return env->regs[0];
} else {
return set_swi_errno(ts, uninterrupted_close(ARG(0)));
}
case SYS_WRITEC:
{
char c;
if (get_user_u8(c, args))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
/* Write to debug console. stderr is near enough. */
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
return env->regs[0];
} else {
ret = uninterrupted_write(STDERR_FILENO, &c, 1);
return set_swi_errno(ts, ret);
}
}
case SYS_WRITE0:
if (!(s = lock_user_string(args)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
len = strlen(s);
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
ret = env->regs[0];
} else {
ret = uninterrupted_write(STDERR_FILENO, s, len);
ret = set_swi_errno(ts, ret);
}
unlock_user(s, args, 0);
return ret;
case SYS_WRITE:
len = ARG(2);
if (use_gdb_syscalls()) {
arm_semi_syscall_len = len;
gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
return env->regs[0];
} else {
if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
ret = set_swi_errno(ts, uninterrupted_write(ARG(0), s, len));
unlock_user(s, ARG(1), 0);
if (ret == (uint32_t)-1)
return -1;
return len - ret;
}
case SYS_READ:
len = ARG(2);
if (use_gdb_syscalls()) {
arm_semi_syscall_len = len;
gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
return env->regs[0];
} else {
if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
ret = set_swi_errno(ts, uninterrupted_read(ARG(0), s, len));
unlock_user(s, ARG(1), len);
if (ret == (uint32_t)-1)
return -1;
return len - ret;
}
case SYS_READC:
/* XXX: Read from debug cosole. Not implemented. */
return 0;
case SYS_ISTTY:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
return env->regs[0];
} else {
return isatty(ARG(0));
}
case SYS_SEEK:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
return env->regs[0];
} else {
ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
if (ret == (uint32_t)-1)
return -1;
return 0;
}
case SYS_FLEN:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
ARG(0), env->regs[13]-64);
return env->regs[0];
} else {
struct stat buf;
ret = set_swi_errno(ts, fstat(ARG(0), &buf));
if (ret == (uint32_t)-1)
return -1;
return buf.st_size;
}
case SYS_TMPNAM:
/* XXX: Not implemented. */
return -1;
case SYS_REMOVE:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
ret = env->regs[0];
} else {
if (!(s = lock_user_string(ARG(0))))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
ret = set_swi_errno(ts, remove(s));
unlock_user(s, ARG(0), 0);
}
return ret;
case SYS_RENAME:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
return env->regs[0];
} else {
char *s2;
s = lock_user_string(ARG(0));
s2 = lock_user_string(ARG(2));
if (!s || !s2)
/* FIXME - should this error code be -TARGET_EFAULT ? */
ret = (uint32_t)-1;
else
ret = set_swi_errno(ts, rename(s, s2));
if (s2)
unlock_user(s2, ARG(2), 0);
if (s)
unlock_user(s, ARG(0), 0);
return ret;
}
case SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case SYS_TIME:
return set_swi_errno(ts, time(NULL));
case SYS_SYSTEM:
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
return env->regs[0];
} else {
if (!(s = lock_user_string(ARG(0))))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
ret = set_swi_errno(ts, system(s));
unlock_user(s, ARG(0), 0);
return ret;
}
case SYS_ERRNO:
#ifdef CONFIG_USER_ONLY
return ts->swi_errno;
#else
return syscall_err;
#endif
case SYS_GET_CMDLINE:
#ifdef CONFIG_USER_ONLY
/* Build a commandline from the original argv. */
{
char **arg = ts->info->host_argv;
int len = ARG(1);
/* lock the buffer on the ARM side */
char *cmdline_buffer = (char*)lock_user(VERIFY_WRITE, ARG(0), len, 0);
if (!cmdline_buffer)
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
s = cmdline_buffer;
while (*arg && len > 2) {
int n = strlen(*arg);
if (s != cmdline_buffer) {
*(s++) = ' ';
len--;
}
if (n >= len)
n = len - 1;
memcpy(s, *arg, n);
s += n;
len -= n;
arg++;
}
/* Null terminate the string. */
*s = 0;
len = s - cmdline_buffer;
/* Unlock the buffer on the ARM side. */
unlock_user(cmdline_buffer, ARG(0), len);
/* Adjust the commandline length argument. */
SET_ARG(1, len);
/* Return success if commandline fit into buffer. */
return *arg ? -1 : 0;
}
#else
return -1;
#endif
case SYS_HEAPINFO:
{
uint32_t *ptr;
uint32_t limit;
#ifdef CONFIG_USER_ONLY
/* Some C libraries assume the heap immediately follows .bss, so
allocate it using sbrk. */
if (!ts->heap_limit) {
long ret;
ts->heap_base = do_brk(0);
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
if (ret != -1)
break;
limit = (ts->heap_base >> 1) + (limit >> 1);
}
ts->heap_limit = limit;
}
if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
ptr[0] = tswap32(ts->heap_base);
ptr[1] = tswap32(ts->heap_limit);
ptr[2] = tswap32(ts->stack_base);
ptr[3] = tswap32(0); /* Stack limit. */
unlock_user(ptr, ARG(0), 16);
#else
limit = ram_size;
if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
/* TODO: Make this use the limit of the loaded application. */
ptr[0] = tswap32(limit / 2);
ptr[1] = tswap32(limit);
ptr[2] = tswap32(limit); /* Stack base */
ptr[3] = tswap32(0); /* Stack limit. */
unlock_user(ptr, ARG(0), 16);
#endif
return 0;
}
case SYS_EXIT:
/* FIXME: ideally we want to inform gdb about program
exit whenever gdb is connected, even if syscalls
are not handled by gdb. */
if (use_gdb_syscalls())
gdb_exit(env, 0);
exit(0);
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(env, stderr, fprintf, 0);
abort();
}
}