diff options
Diffstat (limited to 'exec-i386.c')
| -rw-r--r-- | exec-i386.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/exec-i386.c b/exec-i386.c index e83d220369..573ba0a8c6 100644 --- a/exec-i386.c +++ b/exec-i386.c @@ -52,6 +52,52 @@ int nb_tbs; uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE]; uint8_t *code_gen_ptr; +/* 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 + +int global_cpu_lock = 0; + +void cpu_lock(void) +{ + while (testandset(&global_cpu_lock)); +} + +void cpu_unlock(void) +{ + global_cpu_lock = 0; +} + #ifdef DEBUG_EXEC static const char *cc_op_str[] = { "DYNAMIC", @@ -266,11 +312,15 @@ int cpu_x86_exec(CPUX86State *env1) tc_ptr = tb->tc_ptr; if (!tb->tc_ptr) { /* 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); tb->tc_ptr = tc_ptr; 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 */ gen_func = (void *)tc_ptr; |