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added JUMP_TB2 for a third basic block exit jump point

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@380 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-09-17 22:53:29 +00:00
parent f513a41a3d
commit 4cbb86e1c4
2 changed files with 32 additions and 8 deletions
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35
exec.h
View File

@ -108,7 +108,7 @@ typedef struct TranslationBlock {
the code of this one. */
uint16_t tb_next_offset[2]; /* offset of original jump target */
#ifdef USE_DIRECT_JUMP
uint16_t tb_jmp_offset[2]; /* offset of jump instruction */
uint16_t tb_jmp_offset[4]; /* offset of jump instruction */
#else
uint32_t tb_next[2]; /* address of jump generated code */
#endif
@ -160,18 +160,14 @@ static inline TranslationBlock *tb_find(TranslationBlock ***pptb,
#if defined(__powerpc__)
static inline void tb_set_jmp_target(TranslationBlock *tb,
int n, unsigned long addr)
static inline void tb_set_jmp_target1(unsigned long jmp_addr, unsigned long addr)
{
uint32_t val, *ptr;
unsigned long offset;
offset = (unsigned long)(tb->tc_ptr + tb->tb_jmp_offset[n]);
/* patch the branch destination */
ptr = (uint32_t *)offset;
ptr = (uint32_t *)jmp_addr;
val = *ptr;
val = (val & ~0x03fffffc) | ((addr - offset) & 0x03fffffc);
val = (val & ~0x03fffffc) | ((addr - jmp_addr) & 0x03fffffc);
*ptr = val;
/* flush icache */
asm volatile ("dcbst 0,%0" : : "r"(ptr) : "memory");
@ -181,6 +177,18 @@ static inline void tb_set_jmp_target(TranslationBlock *tb,
asm volatile ("isync" : : : "memory");
}
static inline void tb_set_jmp_target(TranslationBlock *tb,
int n, unsigned long addr)
{
unsigned long offset;
offset = tb->tb_jmp_offset[n];
tb_set_jmp_target1((unsigned long)(tb->tc_ptr + offset), addr);
offset = tb->tb_jmp_offset[n + 2];
if (offset != 0xffff)
tb_set_jmp_target1((unsigned long)(tb->tc_ptr + offset), addr);
}
#else
/* set the jump target */
@ -228,6 +236,11 @@ do {\
EXIT_TB();\
} while (0)
#define JUMP_TB2(opname, tbparam, n)\
do {\
asm volatile ("b __op_jmp%0\n" : : "i" (n + 2));\
} while (0)
#else
/* jump to next block operations (more portable code, does not need
@ -244,6 +257,12 @@ dummy_label ## n:\
EXIT_TB();\
} while (0)
/* second jump to same destination 'n' */
#define JUMP_TB2(opname, tbparam, n)\
do {\
goto *(void *)(((TranslationBlock *)tbparam)->tb_next[n]);\
} while (0)
#endif
/* physical memory access */

5
translate.c
View File

@ -120,6 +120,11 @@ int cpu_gen_code(CPUState *env, TranslationBlock *tb,
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;
#endif
gen_code_size = dyngen_code(gen_code_buf, tb->tb_next_offset,
#ifdef USE_DIRECT_JUMP
tb->tb_jmp_offset,