*
* Copyright (c) 2003 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 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 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.
+ * 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 General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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-i386.h"
-#define DEBUG_EXEC
+//#define DEBUG_EXEC
#define DEBUG_FLUSH
+//#define DEBUG_SIGNAL
/* main execution loop */
#define CODE_GEN_HASH_SIZE (1 << CODE_GEN_HASH_BITS)
typedef struct TranslationBlock {
- unsigned long pc; /* simulated PC corresponding to this block */
+ unsigned long pc; /* simulated PC corresponding to this block (EIP + CS base) */
+ unsigned long cs_base; /* CS base for this block */
unsigned int flags; /* flags defining in which context the code was generated */
uint8_t *tc_ptr; /* pointer to the translated code */
struct TranslationBlock *hash_next; /* next matching block */
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
uint8_t *code_gen_ptr;
-#ifdef DEBUG_EXEC
+/* thread support */
+
+#ifdef __powerpc__
+static inline int testandset (int *p)
+{
+ int ret;
+ __asm__ __volatile__ (
+ "0: lwarx %0,0,%1 ;"
+ " xor. %0,%3,%0;"
+ " bne 1f;"
+ " stwcx. %2,0,%1;"
+ " bne- 0b;"
+ "1: "
+ : "=&r" (ret)
+ : "r" (p), "r" (1), "r" (0)
+ : "cr0", "memory");
+ return ret;
+}
+#endif
+
+#ifdef __i386__
+static inline int testandset (int *p)
+{
+ char ret;
+ long int readval;
+
+ __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
+ : "=q" (ret), "=m" (*p), "=a" (readval)
+ : "r" (1), "m" (*p), "a" (0)
+ : "memory");
+ return ret;
+}
+#endif
+
+#ifdef __s390__
+static inline int testandset (int *p)
+{
+ int ret;
+
+ __asm__ __volatile__ ("0: cs %0,%1,0(%2)\n"
+ " jl 0b"
+ : "=&d" (ret)
+ : "r" (1), "a" (p), "0" (*p)
+ : "cc", "memory" );
+ return ret;
+}
+#endif
+
+int global_cpu_lock = 0;
+
+void cpu_lock(void)
+{
+ while (testandset(&global_cpu_lock));
+}
+
+void cpu_unlock(void)
+{
+ global_cpu_lock = 0;
+}
+
+/* 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",
"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],
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
}
}
/* 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 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;
tb = *ptb;
if (!tb)
break;
- if (tb->pc == pc && tb->flags == flags)
+ if (tb->pc == pc && tb->cs_base == cs_base && tb->flags == flags)
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->flags = flags;
- tb->tc_ptr = NULL;
- tb->hash_next = NULL;
return tb;
}
{
int saved_T0, saved_T1, saved_A0;
CPUX86State *saved_env;
+#ifdef reg_EAX
+ int saved_EAX;
+#endif
+#ifdef reg_ECX
+ int saved_ECX;
+#endif
+#ifdef reg_EDX
+ int saved_EDX;
+#endif
+#ifdef reg_EBX
+ int saved_EBX;
+#endif
+#ifdef reg_ESP
+ int saved_ESP;
+#endif
+#ifdef reg_EBP
+ int saved_EBP;
+#endif
+#ifdef reg_ESI
+ int saved_ESI;
+#endif
+#ifdef reg_EDI
+ int saved_EDI;
+#endif
int code_gen_size, ret;
void (*gen_func)(void);
- TranslationBlock *tb;
- uint8_t *tc_ptr;
+ TranslationBlock *tb, **ptb;
+ uint8_t *tc_ptr, *cs_base, *pc;
unsigned int flags;
/* first we save global registers */
saved_A0 = A0;
saved_env = env;
env = env1;
+#ifdef reg_EAX
+ saved_EAX = EAX;
+ EAX = env->regs[R_EAX];
+#endif
+#ifdef reg_ECX
+ saved_ECX = ECX;
+ ECX = env->regs[R_ECX];
+#endif
+#ifdef reg_EDX
+ saved_EDX = EDX;
+ EDX = env->regs[R_EDX];
+#endif
+#ifdef reg_EBX
+ saved_EBX = EBX;
+ EBX = env->regs[R_EBX];
+#endif
+#ifdef reg_ESP
+ saved_ESP = ESP;
+ ESP = env->regs[R_ESP];
+#endif
+#ifdef reg_EBP
+ saved_EBP = EBP;
+ EBP = env->regs[R_EBP];
+#endif
+#ifdef reg_ESI
+ saved_ESI = ESI;
+ ESI = env->regs[R_ESI];
+#endif
+#ifdef reg_EDI
+ saved_EDI = EDI;
+ EDI = env->regs[R_EDI];
+#endif
+
+ /* put eflags in CPU temporary format */
+ CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
+ DF = 1 - (2 * ((env->eflags >> 10) & 1));
+ CC_OP = CC_OP_EFLAGS;
+ env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
+ 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
change during the whole generated block. */
flags = env->seg_cache[R_CS].seg_32bit << GEN_FLAG_CODE32_SHIFT;
+ flags |= env->seg_cache[R_SS].seg_32bit << GEN_FLAG_SS32_SHIFT;
flags |= (((unsigned long)env->seg_cache[R_DS].base |
(unsigned long)env->seg_cache[R_ES].base |
(unsigned long)env->seg_cache[R_SS].base) != 0) <<
GEN_FLAG_ADDSEG_SHIFT;
- tb = tb_find_and_alloc((unsigned long)env->pc, flags);
- tc_ptr = tb->tc_ptr;
- if (!tb->tc_ptr) {
+ flags |= (env->eflags & VM_MASK) >> (17 - GEN_FLAG_VM_SHIFT);
+ cs_base = env->seg_cache[R_CS].base;
+ pc = cs_base + env->eip;
+ 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, (uint8_t *)env->pc, 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 */
+ env->eflags = env->eflags | cc_table[CC_OP].compute_all() | (DF & DF_MASK);
+
/* restore global registers */
+#ifdef reg_EAX
+ EAX = saved_EAX;
+#endif
+#ifdef reg_ECX
+ ECX = saved_ECX;
+#endif
+#ifdef reg_EDX
+ EDX = saved_EDX;
+#endif
+#ifdef reg_EBX
+ EBX = saved_EBX;
+#endif
+#ifdef reg_ESP
+ ESP = saved_ESP;
+#endif
+#ifdef reg_EBP
+ EBP = saved_EBP;
+#endif
+#ifdef reg_ESI
+ ESI = saved_ESI;
+#endif
+#ifdef reg_EDI
+ EDI = saved_EDI;
+#endif
T0 = saved_T0;
T1 = saved_T1;
A0 = saved_A0;
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;
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;
+
+#ifndef REG_EIP
+/* for glibc 2.1 */
+#define REG_EIP EIP
+#endif
+ pc = uc->uc_mcontext.gregs[REG_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
+}
projects / qemu / blobdiff