2003-11-18 22:29:40 +01:00
|
|
|
/* libunwind - a platform-independent unwind library
|
|
|
|
Copyright (C) 2002 Hewlett-Packard Co
|
|
|
|
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 "unwind_i.h"
|
|
|
|
#include "offsets.h"
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
update_frame_state (struct cursor *c)
|
|
|
|
{
|
|
|
|
#if 0
|
|
|
|
unw_word_t prev_ip, prev_sp, prev_bsp, ip, pr, num_regs, cfm;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
prev_ip = c->ip;
|
|
|
|
prev_sp = c->sp;
|
|
|
|
prev_bsp = c->bsp;
|
|
|
|
|
|
|
|
c->cfm_loc = c->pfs_loc;
|
|
|
|
|
|
|
|
num_regs = 0;
|
|
|
|
if (c->is_signal_frame)
|
|
|
|
{
|
|
|
|
ret = ia64_get (c, c->sp + 0x10 + SIGFRAME_ARG2_OFF, &c->sigcontext_loc);
|
|
|
|
debug (100, "%s: sigcontext_loc=%lx (ret=%d)\n",
|
|
|
|
__FUNCTION__, c->sigcontext_loc, ret);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (c->ip_loc == c->sigcontext_loc + SIGCONTEXT_BR_OFF + 0*8)
|
|
|
|
{
|
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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
|
|
|
|
{
|
|
|
|
ret = ia64_get (c, c->cfm_loc, &cfm);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
num_regs = (cfm >> 7) & 0x7f; /* size of locals */
|
|
|
|
}
|
|
|
|
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;
|
|
|
|
|
|
|
|
if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)
|
|
|
|
{
|
|
|
|
dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
|
|
|
|
__FUNCTION__, (long) ip);
|
|
|
|
return -UNW_EBADFRAME;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* as we unwind, the saved ar.unat becomes the primary unat: */
|
|
|
|
c->pri_unat_loc = c->unat_loc;
|
|
|
|
|
|
|
|
/* restore the predicates: */
|
|
|
|
ret = ia64_get (c, c->pr_loc, &c->pr);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
c->pi_valid = 0;
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
unw_step (unw_cursor_t *cursor)
|
|
|
|
{
|
|
|
|
struct cursor *c = (struct cursor *) cursor;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
|
|
if (unw_is_signal_frame(cursor))
|
|
|
|
{
|
|
|
|
/* Without SA_SIGINFO, */
|
|
|
|
/* c -> esp points at the arguments to the handler. */
|
|
|
|
/* This consists of a signal number followed by a */
|
|
|
|
/* struct sigcontext. */
|
|
|
|
/* With SA_SIGINFO, the arguments consists of the */
|
|
|
|
/* signal number, a siginfo *, and a ucontext * . */
|
|
|
|
unw_word_t siginfo_ptr_addr = c->esp + 4;
|
|
|
|
unw_word_t sigcontext_ptr_addr = c->esp + 8;
|
|
|
|
unw_word_t siginfo_ptr, sigcontext_ptr;
|
|
|
|
struct x86_loc esp_loc, siginfo_ptr_loc, sigcontext_ptr_loc;
|
|
|
|
|
|
|
|
siginfo_ptr_loc = X86_LOC (siginfo_ptr_addr, 0);
|
|
|
|
sigcontext_ptr_loc = X86_LOC (sigcontext_ptr_addr, 0);
|
|
|
|
ret = (x86_get (c, siginfo_ptr_loc, &siginfo_ptr)
|
|
|
|
| x86_get (c, sigcontext_ptr_loc, &sigcontext_ptr));
|
|
|
|
if (ret < 0)
|
|
|
|
return 0;
|
|
|
|
if (siginfo_ptr < c -> esp || siginfo_ptr > c -> esp + 256
|
|
|
|
|| sigcontext_ptr < c -> esp || sigcontext_ptr > c -> esp + 256)
|
|
|
|
{
|
|
|
|
/* Not plausible for SA_SIGINFO signal */
|
|
|
|
unw_word_t sigcontext_addr = c->esp + 4;
|
|
|
|
esp_loc = X86_LOC (sigcontext_addr + LINUX_SC_ESP_OFF, 0);
|
|
|
|
c->ebp_loc = X86_LOC (sigcontext_addr + LINUX_SC_EBP_OFF, 0);
|
|
|
|
c->eip_loc = X86_LOC (sigcontext_addr + LINUX_SC_EIP_OFF, 0);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* If SA_SIGINFO were not specified, we actually read */
|
|
|
|
/* various segment pointers instead. We believe that at */
|
|
|
|
/* least fs and _fsh are always zero for linux, so it is */
|
|
|
|
/* is not just unlikely, but impossible that we would end up */
|
|
|
|
/* here. */
|
|
|
|
esp_loc = X86_LOC (sigcontext_ptr + LINUX_UC_ESP_OFF, 0);
|
|
|
|
c->ebp_loc = X86_LOC (sigcontext_ptr + LINUX_UC_EBP_OFF, 0);
|
|
|
|
c->eip_loc = X86_LOC (sigcontext_ptr + LINUX_UC_EIP_OFF, 0);
|
|
|
|
}
|
|
|
|
ret = x86_get (c, esp_loc, &c->esp);
|
|
|
|
if (ret < 0)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ret = x86_get (c, c->ebp_loc, &c->esp);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
c->ebp_loc = X86_LOC (c->esp, 0);
|
|
|
|
c->eip_loc = X86_LOC (c->esp + 4, 0);
|
|
|
|
c->esp += 8;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (X86_GET_LOC (c->ebp_loc))
|
|
|
|
{
|
|
|
|
ret = x86_get (c, c->eip_loc, &c->eip);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
c->eip = 0;
|
|
|
|
|
|
|
|
return (c->eip == 0) ? 0 : 1;
|
|
|
|
}
|