mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-06-30 05:01:44 +02:00
bb03dca33e
2004/10/19 23:15:02-07:00 mostang.com!davidm (update_frame_state): Take additional argument "prev_cfa". When we detect a NULL-frame, debug-print the IP and the CFA so we know where things went wrong. (dwarf_step): Get "prev_cfa" before we call dwarf_find_save_locs(), since update_frame_state() doesn't actually update the CFA. (Logical change 1.290)
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (c) 2003-2004 Hewlett-Packard Development Company, L.P.
|
|
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
|
|
|
|
This file is part of libunwind.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
|
a copy of this software and associated documentation files (the
|
|
"Software"), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to
|
|
permit persons to whom the Software is furnished to do so, subject to
|
|
the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
|
|
#include "dwarf.h"
|
|
#include "tdep.h"
|
|
|
|
static int
|
|
update_frame_state (struct dwarf_cursor *c, unw_word_t prev_cfa)
|
|
{
|
|
unw_word_t prev_ip, ip;
|
|
int ret;
|
|
|
|
prev_ip = c->ip;
|
|
|
|
/* 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 = dwarf_get (c, c->loc[c->ret_addr_column], &ip);
|
|
if (ret < 0)
|
|
return ret;
|
|
c->ip = ip;
|
|
|
|
#if 0
|
|
/* ??? fix me---perhaps move to where we have convenient access to
|
|
code_align? */
|
|
if ((ip & (c->code_align - 1)) != 0)
|
|
{
|
|
/* don't let obviously bad addresses pollute the cache */
|
|
Debug (1, "rejecting bad ip=0x%lx\n", (long) c->ip);
|
|
return -UNW_EINVALIDIP;
|
|
}
|
|
#endif
|
|
if (ip == 0)
|
|
/* end of frame-chain reached */
|
|
return 0;
|
|
|
|
#if 0
|
|
num_regs = 0;
|
|
if (unlikely (c->abi_marker))
|
|
{
|
|
c->last_abi_marker = c->abi_marker;
|
|
switch (c->abi_marker)
|
|
{
|
|
case ABI_MARKER_LINUX_SIGTRAMP:
|
|
case ABI_MARKER_OLD_LINUX_SIGTRAMP:
|
|
c->as->abi = ABI_LINUX;
|
|
if ((ret = linux_sigtramp (c, &num_regs)) < 0)
|
|
return ret;
|
|
break;
|
|
|
|
case ABI_MARKER_OLD_LINUX_INTERRUPT:
|
|
case ABI_MARKER_LINUX_INTERRUPT:
|
|
c->as->abi = ABI_LINUX;
|
|
if ((ret = linux_interrupt (c, &num_regs, c->abi_marker)) < 0)
|
|
return ret;
|
|
break;
|
|
|
|
case ABI_MARKER_HP_UX_SIGTRAMP:
|
|
c->as->abi = ABI_HPUX;
|
|
if ((ret = hpux_sigtramp (c, &num_regs)) < 0)
|
|
return ret;
|
|
break;
|
|
|
|
default:
|
|
Debug (1, "unknown ABI marker: ABI=%u, context=%u\n",
|
|
c->abi_marker >> 8, c->abi_marker & 0xff);
|
|
return -UNW_EINVAL;
|
|
}
|
|
Debug (10, "sigcontext_addr=%lx (ret=%d)\n",
|
|
(unsigned long) c->sigcontext_addr, ret);
|
|
|
|
c->sigcontext_off = c->sigcontext_addr - c->cfa;
|
|
|
|
/* update the IP cache: */
|
|
if ((ret = ia64_get (c, c->loc[IA64_REG_IP], &ip)) < 0)
|
|
return ret;
|
|
c->ip = ip;
|
|
if (ip == 0)
|
|
/* end of frame-chain reached */
|
|
return 0;
|
|
}
|
|
else
|
|
num_regs = (c->cfm >> 7) & 0x7f; /* size of locals */
|
|
|
|
c->abi_marker = 0;
|
|
#endif
|
|
|
|
if (c->ip == prev_ip && c->cfa == prev_cfa)
|
|
{
|
|
dprintf ("%s: ip and cfa unchanged; stopping (ip=0x%lx cfa=0x%lx)\n",
|
|
__FUNCTION__, (long) prev_ip, (long) prev_cfa);
|
|
return -UNW_EBADFRAME;
|
|
}
|
|
|
|
c->pi_valid = 0;
|
|
return 0;
|
|
}
|
|
|
|
HIDDEN int
|
|
dwarf_step (struct dwarf_cursor *c)
|
|
{
|
|
unw_word_t prev_cfa = c->cfa;
|
|
int ret;
|
|
|
|
if ((ret = dwarf_find_save_locs (c)) >= 0
|
|
&& (ret = update_frame_state (c, prev_cfa)) >= 0)
|
|
ret = (c->ip == 0) ? 0 : 1;
|
|
|
|
Debug (15, "returning %d\n", ret);
|
|
return ret;
|
|
}
|