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Improved workaround for the annoying glibc global register mangling bug

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4465 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
blueswir1 2008-05-17 07:38:10 +00:00
parent 79c638586e
commit 572a9d4a88
1 changed files with 11 additions and 47 deletions
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58
cpu-exec.c
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@ -37,53 +37,18 @@
#include <sys/ucontext.h>
#endif
#if defined(__sparc__) && !defined(HOST_SOLARIS)
// Work around ugly bugs in glibc that mangle global register contents
#undef env
#define env cpu_single_env
#endif
int tb_invalidated_flag;
static unsigned long next_tb;
//#define DEBUG_EXEC
//#define DEBUG_SIGNAL
#define SAVE_GLOBALS()
#define RESTORE_GLOBALS()
#if defined(__sparc__) && !defined(HOST_SOLARIS)
#include <features.h>
#if defined(__GLIBC__) && ((__GLIBC__ < 2) || \
((__GLIBC__ == 2) && (__GLIBC_MINOR__ <= 90)))
// Work around ugly bugs in glibc that mangle global register contents
static volatile void *saved_env;
#undef SAVE_GLOBALS
#define SAVE_GLOBALS() do { \
saved_env = env; \
} while(0)
#undef RESTORE_GLOBALS
#define RESTORE_GLOBALS() do { \
env = (void *)saved_env; \
} while(0)
static int sparc_setjmp(jmp_buf buf)
{
int ret;
SAVE_GLOBALS();
ret = setjmp(buf);
RESTORE_GLOBALS();
return ret;
}
#undef setjmp
#define setjmp(jmp_buf) sparc_setjmp(jmp_buf)
static void sparc_longjmp(jmp_buf buf, int val)
{
SAVE_GLOBALS();
longjmp(buf, val);
}
#define longjmp(jmp_buf, val) sparc_longjmp(jmp_buf, val)
#endif
#endif
void cpu_loop_exit(void)
{
/* NOTE: the register at this point must be saved by hand because
@ -176,9 +141,7 @@ static TranslationBlock *tb_find_slow(target_ulong pc,
tb->tc_ptr = tc_ptr;
tb->cs_base = cs_base;
tb->flags = flags;
SAVE_GLOBALS();
cpu_gen_code(env, tb, &code_gen_size);
RESTORE_GLOBALS();
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
@ -302,7 +265,6 @@ int cpu_exec(CPUState *env1)
#define SAVE_HOST_REGS 1
#include "hostregs_helper.h"
env = env1;
SAVE_GLOBALS();
env_to_regs();
#if defined(TARGET_I386)
@ -414,7 +376,6 @@ int cpu_exec(CPUState *env1)
next_tb = 0; /* force lookup of first TB */
for(;;) {
SAVE_GLOBALS();
interrupt_request = env->interrupt_request;
if (__builtin_expect(interrupt_request, 0)
#if defined(TARGET_I386)
@ -633,7 +594,6 @@ int cpu_exec(CPUState *env1)
lookup_symbol(tb->pc));
}
#endif
RESTORE_GLOBALS();
/* see if we can patch the calling TB. When the TB
spans two pages, we cannot safely do a direct
jump. */
@ -651,6 +611,11 @@ int cpu_exec(CPUState *env1)
tc_ptr = tb->tc_ptr;
env->current_tb = tb;
/* execute the generated code */
#if defined(__sparc__) && !defined(HOST_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
next_tb = tcg_qemu_tb_exec(tc_ptr);
env->current_tb = NULL;
/* reset soft MMU for next block (it can currently
@ -701,7 +666,6 @@ int cpu_exec(CPUState *env1)
#endif
/* restore global registers */
RESTORE_GLOBALS();
#include "hostregs_helper.h"
/* fail safe : never use cpu_single_env outside cpu_exec() */