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(update_frame_state): Update the IP-cache before doing anything else.

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If we reached the en of the frame-chain, then the remaining
	registers may not be valid/accessible anymore.

(Logical change 1.55)
This commit is contained in:
hp.com!davidm 2003-02-26 08:33:57 +00:00
parent 1fc6f4e6b3
commit bd93c64f01
1 changed files with 26 additions and 16 deletions
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42
src/ia64/Gstep-ia64.c
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@ -83,6 +83,24 @@ update_frame_state (struct cursor *c)
prev_sp = c->sp;
prev_bsp = c->bsp;
/* Update the IP cache (do this first: if we reach the end of the
frame-chain, the rest of the info may not be valid/useful
anymore. */
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;
}
if (ip == 0)
/* end of frame-chain reached */
return 0;
c->cfm_loc = c->pfs_loc;
/* update the CFM cache: */
ret = ia64_get (c, c->cfm_loc, &c->cfm);
@ -106,6 +124,14 @@ update_frame_state (struct cursor *c)
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);
/* update the IP cache: */
ret = ia64_get (c, c->ip_loc, &ip);
if (ret < 0)
return ret;
c->ip = ip;
if (ip == 0)
/* end of frame-chain reached */
return 0;
/* update the CFM cache: */
ret = ia64_get (c, c->cfm_loc, &c->cfm);
if (ret < 0)
@ -129,22 +155,6 @@ update_frame_state (struct cursor *c)
c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
/* 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;
}
if (ip == 0)
/* end of frame-chain reached */
return 0;
pr = c->pr;
c->sp = c->psp;
c->is_signal_frame = 0;