experimental code copy support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@623 c046a42c-6fe2-441c-8c8c-71466251a162

exec-all.h

@@ -79,7 +79,13 @@ void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf);
 int cpu_gen_code(CPUState *env, struct TranslationBlock *tb,
                  int max_code_size, int *gen_code_size_ptr);
 int cpu_restore_state(struct TranslationBlock *tb, 
-                      CPUState *env, unsigned long searched_pc);
+                      CPUState *env, unsigned long searched_pc,
+                      void *puc);
+int cpu_gen_code_copy(CPUState *env, struct TranslationBlock *tb,
+                      int max_code_size, int *gen_code_size_ptr);
+int cpu_restore_state_copy(struct TranslationBlock *tb, 
+                           CPUState *env, unsigned long searched_pc,
+                           void *puc);
 void cpu_exec_init(void);
 int page_unprotect(unsigned long address);
 void tb_invalidate_page_range(target_ulong start, target_ulong end);
@@ -145,6 +151,9 @@ typedef struct TranslationBlock {
     unsigned int flags; /* flags defining in which context the code was generated */
     uint16_t size;      /* size of target code for this block (1 <=
                            size <= TARGET_PAGE_SIZE) */
+    uint16_t cflags;    /* compile flags */
+#define CF_CODE_COPY  0x0001 /* block was generated in code copy mode */
+
     uint8_t *tc_ptr;    /* pointer to the translated code */
     struct TranslationBlock *hash_next; /* next matching tb for virtual address */
     /* next matching tb for physical address. */
@@ -552,4 +561,3 @@ static inline target_ulong get_phys_addr_code(CPUState *env, target_ulong addr)
     return addr + env->tlb_read[is_user][index].addend - (unsigned long)phys_ram_base;
 }
 #endif
-

linux-user/signal.c

@@ -378,7 +378,11 @@ static void host_signal_handler(int host_signum, siginfo_t *info,
 
     /* the CPU emulator uses some host signals to detect exceptions,
        we we forward to it some signals */
-    if (host_signum == SIGSEGV || host_signum == SIGBUS) {
+    if (host_signum == SIGSEGV || host_signum == SIGBUS 
+#if defined(TARGET_I386) && defined(USE_CODE_COPY)
+        || host_signum == SIGFPE
+#endif
+        ) {
         if (cpu_signal_handler(host_signum, info, puc))
             return;
     }

target-i386/cpu.h

@@ -24,6 +24,10 @@
 
 #include "cpu-defs.h"
 
+#if defined(__i386__) && !defined(CONFIG_SOFTMMU)
+#define USE_CODE_COPY
+#endif
+
 #define R_EAX 0
 #define R_ECX 1
 #define R_EDX 2
@@ -121,6 +125,7 @@
 #define HF_SS32_MASK         (1 << HF_SS32_SHIFT)
 #define HF_ADDSEG_MASK       (1 << HF_ADDSEG_SHIFT)
 #define HF_PE_MASK           (1 << HF_PE_SHIFT)
+#define HF_TF_MASK           (1 << HF_TF_SHIFT)
 
 #define CR0_PE_MASK  (1 << 0)
 #define CR0_TS_MASK  (1 << 3)
@@ -297,6 +302,10 @@ typedef struct CPUX86State {
     uint32_t sysenter_cs;
     uint32_t sysenter_esp;
     uint32_t sysenter_eip;
+
+    /* temporary data for USE_CODE_COPY mode */
+    uint32_t tmp0;
+    uint32_t saved_esp;
     
     /* exception/interrupt handling */
     jmp_buf jmp_env;

target-i386/helper.c

@@ -869,7 +869,7 @@ void do_interrupt(int intno, int is_int, int error_code,
     {
         extern FILE *stdout;
         static int count;
-        if (env->cr[0] & CR0_PE_MASK) {
+        if (env->cr[0] & CR0_PE_MASK)  {
             fprintf(stdout, "%d: v=%02x e=%04x i=%d CPL=%d CS:EIP=%04x:%08x SS:ESP=%04x:%08x",
                     count, intno, error_code, is_int,
                     env->hflags & HF_CPL_MASK,
@@ -2489,7 +2489,7 @@ void tlb_fill(unsigned long addr, int is_write, int is_user, void *retaddr)
             if (tb) {
                 /* the PC is inside the translated code. It means that we have
                    a virtual CPU fault */
-                cpu_restore_state(tb, env, pc);
+                cpu_restore_state(tb, env, pc, NULL);
             }
         }
         raise_exception_err(EXCP0E_PAGE, env->error_code);

translate-all.c

@@ -48,6 +48,8 @@ uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
 uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
 #endif
 
+int code_copy_enabled = 1;
+
 #ifdef DEBUG_DISAS
 static const char *op_str[] = {
 #define DEF(s, n, copy_size) #s,
@@ -98,30 +100,38 @@ int cpu_gen_code(CPUState *env, TranslationBlock *tb,
     uint8_t *gen_code_buf;
     int gen_code_size;
 
-    if (gen_intermediate_code(env, tb) < 0)
-        return -1;
+#ifdef USE_CODE_COPY
+    if (code_copy_enabled &&
+        cpu_gen_code_copy(env, tb, max_code_size, &gen_code_size) == 0) {
+        /* nothing more to do */
+    } else
+#endif
+    {
+        if (gen_intermediate_code(env, tb) < 0)
+            return -1;
 
-    /* generate machine code */
-    tb->tb_next_offset[0] = 0xffff;
-    tb->tb_next_offset[1] = 0xffff;
-    gen_code_buf = tb->tc_ptr;
+        /* generate machine code */
+        tb->tb_next_offset[0] = 0xffff;
+        tb->tb_next_offset[1] = 0xffff;
+        gen_code_buf = tb->tc_ptr;
 #ifdef USE_DIRECT_JUMP
-    /* the following two entries are optional (only used for string ops) */
-    tb->tb_jmp_offset[2] = 0xffff;
-    tb->tb_jmp_offset[3] = 0xffff;
+        /* the following two entries are optional (only used for string ops) */
+        tb->tb_jmp_offset[2] = 0xffff;
+        tb->tb_jmp_offset[3] = 0xffff;
 #endif
-    gen_code_size = dyngen_code(gen_code_buf, tb->tb_next_offset,
+        gen_code_size = dyngen_code(gen_code_buf, tb->tb_next_offset,
 #ifdef USE_DIRECT_JUMP
-                                tb->tb_jmp_offset,
+                                    tb->tb_jmp_offset,
 #else
-                                NULL,
+                                    NULL,
 #endif
-                                gen_opc_buf, gen_opparam_buf);
+                                    gen_opc_buf, gen_opparam_buf);
+    }
     *gen_code_size_ptr = gen_code_size;
 #ifdef DEBUG_DISAS
-    if (loglevel && 0) {
+    if (loglevel) {
         fprintf(logfile, "OUT: [size=%d]\n", *gen_code_size_ptr);
-        disas(logfile, gen_code_buf, *gen_code_size_ptr, 1, 0);
+        disas(logfile, tb->tc_ptr, *gen_code_size_ptr, 1, 0);
         fprintf(logfile, "\n");
         fflush(logfile);
     }
@@ -138,12 +148,18 @@ static const unsigned short opc_copy_size[] = {
 /* The cpu state corresponding to 'searched_pc' is restored. 
  */
 int cpu_restore_state(TranslationBlock *tb, 
-                      CPUState *env, unsigned long searched_pc)
+                      CPUState *env, unsigned long searched_pc,
+                      void *puc)
 {
     int j, c;
     unsigned long tc_ptr;
     uint16_t *opc_ptr;
 
+#ifdef USE_CODE_COPY
+    if (tb->cflags & CF_CODE_COPY) {
+        return cpu_restore_state_copy(tb, env, searched_pc, puc);
+    }
+#endif
     if (gen_intermediate_code_pc(env, tb) < 0)
         return -1;
     
@@ -190,6 +206,7 @@ int cpu_restore_state(TranslationBlock *tb,
 #elif defined(TARGET_ARM)
     env->regs[15] = gen_opc_pc[j];
 #elif defined(TARGET_SPARC)
+    /* XXX: restore npc too */
     env->pc = gen_opc_pc[j];
 #elif defined(TARGET_PPC)
     {