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(update_frame_state): Fix handling of sigtramp frames. Also work around bugs

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in kernel unwind info.

(Logical change 1.18)
This commit is contained in:
mostang.com!davidm 2002-04-25 06:47:29 +00:00
parent 118746f9e5
commit 039f99fef0
1 changed files with 30 additions and 35 deletions

65
src/ia64/unw_step.c
View file

@ -35,49 +35,31 @@ update_frame_state (struct ia64_cursor *c)
prev_sp = c->sp;
prev_bsp = c->bsp;
/* update the IP cache: */
ret = ia64_get (c, c->ip_loc, &ip);
if (ret < 0)
return ret;
c->ip = ip;
if ((ip & 0xf) != 0)
{
/* don't let obviously bad addresses pollute the cache */
debug (1, "%s: rejecting bad ip=0x%lx\n", __FUNCTION__, (long) c->ip);
return -UNW_EINVALIDIP;
}
/* restore the cfm: */
c->cfm_loc = c->pfs_loc;
/* restore the bsp: */
pr = c->pr;
num_regs = 0;
if ((c->pi.flags & IA64_FLAG_SIGTRAMP))
if ((c->pi.flags & IA64_FLAG_SIGTRAMP) != 0)
{
unw_word_t sigcontext_addr, sigcontext_flags;
ret = ia64_get (c, c->sp + 0x10, &sigcontext_addr);
ret = ia64_get (c, c->sp + 0x10 + SIGFRAME_ARG2_OFF, &c->sigcontext_loc);
if (ret < 0)
return ret;
ret = ia64_get (c, (sigcontext_addr + SIGCONTEXT_FLAGS_OFF),
&sigcontext_flags);
if (ret < 0)
return ret;
if ((sigcontext_flags & IA64_SC_FLAG_IN_SYSCALL_BIT) == 0)
if (c->ip_loc == c->sigcontext_loc + SIGCONTEXT_BR_OFF + 0*8)
{
unw_word_t cfm;
ret = ia64_get (c, c->cfm_loc, &cfm);
if (ret < 0)
return ret;
num_regs = cfm & 0x7f; /* size of frame */
/* Earlier kernels (before 2.4.19 and 2.5.10) had buggy
unwind info for sigtramp. Fix it up here. */
c->ip_loc = (c->sigcontext_loc + SIGCONTEXT_IP_OFF);
c->cfm_loc = (c->sigcontext_loc + SIGCONTEXT_CFM_OFF);
}
c->pfs_loc = (c->sp + 0x10 + SIGCONTEXT_AR_PFS_OFF);
/* do what can't be described by unwind directives: */
c->pfs_loc = (c->sigcontext_loc + SIGCONTEXT_AR_PFS_OFF);
ret = ia64_get (c, c->cfm_loc, &cfm);
if (ret < 0)
return ret;
num_regs = cfm & 0x7f; /* size of frame */
}
else
{
@ -88,7 +70,20 @@ update_frame_state (struct ia64_cursor *c)
}
c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
/* restore the sp: */
/* update the IP cache: */
ret = ia64_get (c, c->ip_loc, &ip);
if (ret < 0)
return ret;
c->ip = ip;
if ((ip & 0xc) != 0)
{
/* don't let obviously bad addresses pollute the cache */
debug (1, "%s: rejecting bad ip=0x%lx\n", __FUNCTION__, (long) c->ip);
return -UNW_EINVALIDIP;
}
pr = c->pr;
c->sp = c->psp;
if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)