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-rw-r--r--exec-i386.c173
1 files changed, 148 insertions, 25 deletions
diff --git a/exec-i386.c b/exec-i386.c
index 573ba0a8c6..269a1e42fc 100644
--- a/exec-i386.c
+++ b/exec-i386.c
@@ -21,6 +21,7 @@
//#define DEBUG_EXEC
#define DEBUG_FLUSH
+//#define DEBUG_SIGNAL
/* main execution loop */
@@ -98,7 +99,41 @@ void cpu_unlock(void)
global_cpu_lock = 0;
}
-#ifdef DEBUG_EXEC
+/* exception support */
+/* NOTE: not static to force relocation generation by GCC */
+void raise_exception(int exception_index)
+{
+ /* NOTE: the register at this point must be saved by hand because
+ longjmp restore them */
+#ifdef reg_EAX
+ env->regs[R_EAX] = EAX;
+#endif
+#ifdef reg_ECX
+ env->regs[R_ECX] = ECX;
+#endif
+#ifdef reg_EDX
+ env->regs[R_EDX] = EDX;
+#endif
+#ifdef reg_EBX
+ env->regs[R_EBX] = EBX;
+#endif
+#ifdef reg_ESP
+ env->regs[R_ESP] = ESP;
+#endif
+#ifdef reg_EBP
+ env->regs[R_EBP] = EBP;
+#endif
+#ifdef reg_ESI
+ env->regs[R_ESI] = ESI;
+#endif
+#ifdef reg_EDI
+ env->regs[R_EDI] = EDI;
+#endif
+ env->exception_index = exception_index;
+ longjmp(env->jmp_env, 1);
+}
+
+#if defined(DEBUG_EXEC)
static const char *cc_op_str[] = {
"DYNAMIC",
"EFLAGS",
@@ -132,15 +167,16 @@ static const char *cc_op_str[] = {
"SARL",
};
-static void cpu_x86_dump_state(void)
+static void cpu_x86_dump_state(FILE *f)
{
int eflags;
eflags = cc_table[CC_OP].compute_all();
eflags |= (DF & DIRECTION_FLAG);
- fprintf(logfile,
+ fprintf(f,
"EAX=%08x EBX=%08X ECX=%08x EDX=%08x\n"
"ESI=%08x EDI=%08X EBP=%08x ESP=%08x\n"
- "CCS=%08x CCD=%08x CCO=%-8s EFL=%c%c%c%c%c%c%c\n",
+ "CCS=%08x CCD=%08x CCO=%-8s EFL=%c%c%c%c%c%c%c\n"
+ "EIP=%08x\n",
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], env->regs[R_ESP],
env->cc_src, env->cc_dst, cc_op_str[env->cc_op],
@@ -150,10 +186,10 @@ static void cpu_x86_dump_state(void)
eflags & CC_Z ? 'Z' : '-',
eflags & CC_A ? 'A' : '-',
eflags & CC_P ? 'P' : '-',
- eflags & CC_C ? 'C' : '-'
- );
+ eflags & CC_C ? 'C' : '-',
+ env->eip);
#if 1
- fprintf(logfile, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
+ fprintf(f, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
(double)ST0, (double)ST1, (double)ST(2), (double)ST(3));
#endif
}
@@ -185,10 +221,11 @@ static void tb_flush(void)
}
/* find a translation block in the translation cache. If not found,
- allocate a new one */
-static inline TranslationBlock *tb_find_and_alloc(unsigned long pc,
- unsigned long cs_base,
- unsigned int flags)
+ return NULL and the pointer to the last element of the list in pptb */
+static inline TranslationBlock *tb_find(TranslationBlock ***pptb,
+ unsigned long pc,
+ unsigned long cs_base,
+ unsigned int flags)
{
TranslationBlock **ptb, *tb;
unsigned int h;
@@ -203,16 +240,19 @@ static inline TranslationBlock *tb_find_and_alloc(unsigned long pc,
return tb;
ptb = &tb->hash_next;
}
+ *pptb = ptb;
+ return NULL;
+}
+
+/* allocate a new translation block. flush the translation buffer if
+ too many translation blocks or too much generated code */
+static inline TranslationBlock *tb_alloc(void)
+{
+ TranslationBlock *tb;
if (nb_tbs >= CODE_GEN_MAX_BLOCKS ||
(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
tb_flush();
tb = &tbs[nb_tbs++];
- *ptb = tb;
- tb->pc = pc;
- tb->cs_base = cs_base;
- tb->flags = flags;
- tb->tc_ptr = NULL;
- tb->hash_next = NULL;
return tb;
}
@@ -246,7 +286,7 @@ int cpu_x86_exec(CPUX86State *env1)
#endif
int code_gen_size, ret;
void (*gen_func)(void);
- TranslationBlock *tb;
+ TranslationBlock *tb, **ptb;
uint8_t *tc_ptr, *cs_base, *pc;
unsigned int flags;
@@ -289,12 +329,21 @@ int cpu_x86_exec(CPUX86State *env1)
EDI = env->regs[R_EDI];
#endif
+ /* put eflags in CPU temporary format */
+ T0 = env->eflags;
+ op_movl_eflags_T0();
+ CC_OP = CC_OP_EFLAGS;
+ env->interrupt_request = 0;
+
/* prepare setjmp context for exception handling */
if (setjmp(env->jmp_env) == 0) {
for(;;) {
+ if (env->interrupt_request) {
+ raise_exception(EXCP_INTERRUPT);
+ }
#ifdef DEBUG_EXEC
if (loglevel) {
- cpu_x86_dump_state();
+ cpu_x86_dump_state(logfile);
}
#endif
/* we compute the CPU state. We assume it will not
@@ -307,28 +356,43 @@ int cpu_x86_exec(CPUX86State *env1)
GEN_FLAG_ADDSEG_SHIFT;
cs_base = env->seg_cache[R_CS].base;
pc = cs_base + env->eip;
- tb = tb_find_and_alloc((unsigned long)pc, (unsigned long)cs_base,
- flags);
- tc_ptr = tb->tc_ptr;
- if (!tb->tc_ptr) {
+ tb = tb_find(&ptb, (unsigned long)pc, (unsigned long)cs_base,
+ flags);
+ if (!tb) {
/* if no translated code available, then translate it now */
/* XXX: very inefficient: we lock all the cpus when
generating code */
cpu_lock();
tc_ptr = code_gen_ptr;
- cpu_x86_gen_code(code_gen_ptr, CODE_GEN_MAX_SIZE,
- &code_gen_size, pc, cs_base, flags);
+ ret = cpu_x86_gen_code(code_gen_ptr, CODE_GEN_MAX_SIZE,
+ &code_gen_size, pc, cs_base, flags);
+ /* if invalid instruction, signal it */
+ if (ret != 0) {
+ cpu_unlock();
+ raise_exception(EXCP06_ILLOP);
+ }
+ tb = tb_alloc();
+ *ptb = tb;
+ tb->pc = (unsigned long)pc;
+ tb->cs_base = (unsigned long)cs_base;
+ tb->flags = flags;
tb->tc_ptr = tc_ptr;
+ tb->hash_next = NULL;
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
cpu_unlock();
}
/* execute the generated code */
+ tc_ptr = tb->tc_ptr;
gen_func = (void *)tc_ptr;
gen_func();
}
}
ret = env->exception_index;
+ /* restore flags in standard format */
+ op_movl_T0_eflags();
+ env->eflags = T0;
+
/* restore global registers */
#ifdef reg_EAX
EAX = saved_EAX;
@@ -361,6 +425,12 @@ int cpu_x86_exec(CPUX86State *env1)
return ret;
}
+void cpu_x86_interrupt(CPUX86State *s)
+{
+ s->interrupt_request = 1;
+}
+
+
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
{
CPUX86State *saved_env;
@@ -370,3 +440,56 @@ void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
load_seg(seg_reg, selector);
env = saved_env;
}
+
+#undef EAX
+#undef ECX
+#undef EDX
+#undef EBX
+#undef ESP
+#undef EBP
+#undef ESI
+#undef EDI
+#undef EIP
+#include <signal.h>
+#include <sys/ucontext.h>
+
+static inline int handle_cpu_signal(unsigned long pc,
+ sigset_t *old_set)
+{
+#ifdef DEBUG_SIGNAL
+ printf("gemu: SIGSEGV pc=0x%08lx oldset=0x%08lx\n",
+ pc, *(unsigned long *)old_set);
+#endif
+ if (pc >= (unsigned long)code_gen_buffer &&
+ pc < (unsigned long)code_gen_buffer + CODE_GEN_BUFFER_SIZE) {
+ /* the PC is inside the translated code. It means that we have
+ a virtual CPU fault */
+ /* we restore the process signal mask as the sigreturn should
+ do it */
+ sigprocmask(SIG_SETMASK, old_set, NULL);
+ /* XXX: need to compute virtual pc position by retranslating
+ code. The rest of the CPU state should be correct. */
+ raise_exception(EXCP0D_GPF);
+ /* never comes here */
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+int cpu_x86_signal_handler(int host_signum, struct siginfo *info,
+ void *puc)
+{
+#if defined(__i386__)
+ struct ucontext *uc = puc;
+ unsigned long pc;
+ sigset_t *pold_set;
+
+ pc = uc->uc_mcontext.gregs[EIP];
+ pold_set = &uc->uc_sigmask;
+ return handle_cpu_signal(pc, pold_set);
+#else
+#warning No CPU specific signal handler: cannot handle target SIGSEGV events
+ return 0;
+#endif
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-06 09:22:40 +0000