--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/target-m68k/op_helper.c Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,226 @@
+/*
+ * M68K helper routines
+ *
+ * Copyright (c) 2007 CodeSourcery
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include "exec.h"
+#include "helpers.h"
+
+#if defined(CONFIG_USER_ONLY)
+
+void do_interrupt(int is_hw)
+{
+ env->exception_index = -1;
+}
+
+#else
+
+extern int semihosting_enabled;
+
+#define MMUSUFFIX _mmu
+
+#define SHIFT 0
+#include "softmmu_template.h"
+
+#define SHIFT 1
+#include "softmmu_template.h"
+
+#define SHIFT 2
+#include "softmmu_template.h"
+
+#define SHIFT 3
+#include "softmmu_template.h"
+
+/* Try to fill the TLB and return an exception if error. If retaddr is
+ NULL, it means that the function was called in C code (i.e. not
+ from generated code or from helper.c) */
+/* XXX: fix it to restore all registers */
+void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
+{
+ TranslationBlock *tb;
+ CPUState *saved_env;
+ unsigned long pc;
+ int ret;
+
+ /* XXX: hack to restore env in all cases, even if not called from
+ generated code */
+ saved_env = env;
+ env = cpu_single_env;
+ ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
+ if (unlikely(ret)) {
+ if (retaddr) {
+ /* now we have a real cpu fault */
+ pc = (unsigned long)retaddr;
+ tb = tb_find_pc(pc);
+ if (tb) {
+ /* the PC is inside the translated code. It means that we have
+ a virtual CPU fault */
+ cpu_restore_state(tb, env, pc, NULL);
+ }
+ }
+ cpu_loop_exit();
+ }
+ env = saved_env;
+}
+
+static void do_rte(void)
+{
+ uint32_t sp;
+ uint32_t fmt;
+
+ sp = env->aregs[7];
+ fmt = ldl_kernel(sp);
+ env->pc = ldl_kernel(sp + 4);
+ sp |= (fmt >> 28) & 3;
+ env->sr = fmt & 0xffff;
+ m68k_switch_sp(env);
+ env->aregs[7] = sp + 8;
+}
+
+void do_interrupt(int is_hw)
+{
+ uint32_t sp;
+ uint32_t fmt;
+ uint32_t retaddr;
+ uint32_t vector;
+
+ fmt = 0;
+ retaddr = env->pc;
+
+ if (!is_hw) {
+ switch (env->exception_index) {
+ case EXCP_RTE:
+ /* Return from an exception. */
+ do_rte();
+ return;
+ case EXCP_HALT_INSN:
+ if (semihosting_enabled
+ && (env->sr & SR_S) != 0
+ && (env->pc & 3) == 0
+ && lduw_code(env->pc - 4) == 0x4e71
+ && ldl_code(env->pc) == 0x4e7bf000) {
+ env->pc += 4;
+ do_m68k_semihosting(env, env->dregs[0]);
+ return;
+ }
+ env->halted = 1;
+ env->exception_index = EXCP_HLT;
+ cpu_loop_exit();
+ return;
+ }
+ if (env->exception_index >= EXCP_TRAP0
+ && env->exception_index <= EXCP_TRAP15) {
+ /* Move the PC after the trap instruction. */
+ retaddr += 2;
+ }
+ }
+
+ vector = env->exception_index << 2;
+
+ sp = env->aregs[7];
+
+ fmt |= 0x40000000;
+ fmt |= (sp & 3) << 28;
+ fmt |= vector << 16;
+ fmt |= env->sr;
+
+ env->sr |= SR_S;
+ if (is_hw) {
+ env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
+ env->sr &= ~SR_M;
+ }
+ m68k_switch_sp(env);
+
+ /* ??? This could cause MMU faults. */
+ sp &= ~3;
+ sp -= 4;
+ stl_kernel(sp, retaddr);
+ sp -= 4;
+ stl_kernel(sp, fmt);
+ env->aregs[7] = sp;
+ /* Jump to vector. */
+ env->pc = ldl_kernel(env->vbr + vector);
+}
+
+#endif
+
+static void raise_exception(int tt)
+{
+ env->exception_index = tt;
+ cpu_loop_exit();
+}
+
+void HELPER(raise_exception)(uint32_t tt)
+{
+ raise_exception(tt);
+}
+
+void HELPER(divu)(CPUState *env, uint32_t word)
+{
+ uint32_t num;
+ uint32_t den;
+ uint32_t quot;
+ uint32_t rem;
+ uint32_t flags;
+
+ num = env->div1;
+ den = env->div2;
+ /* ??? This needs to make sure the throwing location is accurate. */
+ if (den == 0)
+ raise_exception(EXCP_DIV0);
+ quot = num / den;
+ rem = num % den;
+ flags = 0;
+ /* Avoid using a PARAM1 of zero. This breaks dyngen because it uses
+ the address of a symbol, and gcc knows symbols can't have address
+ zero. */
+ if (word && quot > 0xffff)
+ flags |= CCF_V;
+ if (quot == 0)
+ flags |= CCF_Z;
+ else if ((int32_t)quot < 0)
+ flags |= CCF_N;
+ env->div1 = quot;
+ env->div2 = rem;
+ env->cc_dest = flags;
+}
+
+void HELPER(divs)(CPUState *env, uint32_t word)
+{
+ int32_t num;
+ int32_t den;
+ int32_t quot;
+ int32_t rem;
+ int32_t flags;
+
+ num = env->div1;
+ den = env->div2;
+ if (den == 0)
+ raise_exception(EXCP_DIV0);
+ quot = num / den;
+ rem = num % den;
+ flags = 0;
+ if (word && quot != (int16_t)quot)
+ flags |= CCF_V;
+ if (quot == 0)
+ flags |= CCF_Z;
+ else if (quot < 0)
+ flags |= CCF_N;
+ env->div1 = quot;
+ env->div2 = rem;
+ env->cc_dest = flags;
+}