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ARM: implement rt_get_caller_pc

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This commit is contained in:
Daniel Glöckner 2010-05-14 14:22:32 +02:00
parent 741841d863
commit 20a1cba286
1 changed files with 44 additions and 0 deletions
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44
tccrun.c
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@ -496,6 +496,50 @@ static int rt_get_caller_pc(unsigned long *paddr,
}
}
/* ------------------------------------------------------------- */
#elif defined(__arm__)
/* return the PC at frame level 'level'. Return negative if not found */
static int rt_get_caller_pc(unsigned long *paddr,
ucontext_t *uc, int level)
{
uint32_t fp, sp;
int i;
if (level == 0) {
/* XXX: only supports linux */
#if defined(__linux__)
*paddr = uc->uc_mcontext.arm_pc;
#else
return -1;
#endif
return 0;
} else {
#if defined(__linux__)
fp = uc->uc_mcontext.arm_fp;
sp = uc->uc_mcontext.arm_sp;
if (sp < 0x1000)
sp = 0x1000;
#else
return -1;
#endif
/* XXX: specific to tinycc stack frames */
if (fp < sp + 12 || fp & 3)
return -1;
for(i = 1; i < level; i++) {
sp = ((uint32_t *)fp)[-2];
if (sp < fp || sp - fp > 16 || sp & 3)
return -1;
fp = ((uint32_t *)fp)[-3];
if (fp <= sp || fp - sp < 12 || fp & 3)
return -1;
}
/* XXX: check address validity with program info */
*paddr = ((uint32_t *)fp)[-1];
return 0;
}
}
/* ------------------------------------------------------------- */
#else