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2000-07-29 Greg McGary <greg@mcgary.org> * Rules (test-bp-inputs, make-test-out): New variables. ($(objpfx)%-bp.out): New rule. ($(objpfx)%.out): Rewrite in terms of new variables. * libio/iovswscanf.c (vswscanf): Pass _IO_FILE_plus pointer to internal function that uses vtable. * libio/vsnprintf.c (_IO_vsnprintf): Likewise. * libio/vswprintf.c (_IO_vswprintf): Likewise. * malloc/malloc.c (mem2chunk): Define in terms of chunk_at_offset. (malloc_extend_top): Convert brk to chunk using chunk_at_offset. (chunk_align): Likewise. * time/asctime.c (ab_day_name, ab_month_name): Rewrite expression in a way that conforms to decl, and avoids spurious bounds violation. * sysdeps/arm/frame.h (struct layout): Make pointers __unbounded. * sysdeps/generic/frame.h: Likewise. * sysdeps/generic/backtrace.c (ADVANCE_STACK_FRAME): Wrap bounds around return value. (__backtrace): Qualify frame-pointer chain and return address pointers as __unbounded. Wrap bounds around variable `current'. * sysdeps/generic/segfault.c (ADVANCE_STACK_FRAME): Wrap bounds around return value. (catch_segfault): Qualify frame-pointer chain and return address pointers as __unbounded. Wrap bounds around variable `current'. * sysdeps/i386/backtrace.c (struct layout): Make pointers __unbounded. (ADVANCE_STACK_FRAME): Wrap bounds around return value. * sysdeps/powerpc/backtrace.c (struct layout): Make pointers __unbounded. (__backtrace): Qualify frame-pointer chain and return address pointers as __unbounded. Wrap bounds around variable `current'. * sysdeps/i386/addmul_1.S: s2_limb is scalar so remove bounds check. * sysdeps/i386/mul_1.S: Likewise. * sysdeps/i386/submul_1.S: Likewise. * sysdeps/i386/i586/addmul_1.S: Likewise. * sysdeps/i386/i586/mul_1.S: Add bounds checks. * sysdeps/i386/i586/submul_1.S: Likewise.
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* Return backtrace of current program state.
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Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <execinfo.h>
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#include <stddef.h>
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#include <bp-checks.h>
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/* This is the stack layout we see with every stack frame.
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Note that every routine is required by the ABI to lay out the stack
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like this.
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+----------------+ +-----------------+
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%r1 -> | %r1 last frame--------> | %r1 last frame--->... --> NULL
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| | | |
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| (unused) | | return address |
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+----------------+ +-----------------+
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*/
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struct layout
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{
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struct layout *__unbounded next;
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void *__unbounded return_address;
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};
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int
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__backtrace (void **array, int size)
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{
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struct layout *current;
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int count;
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/* Force gcc to spill LR. */
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asm volatile ("" : "=l"(current));
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/* Get the address on top-of-stack. */
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asm volatile ("lwz %0,0(1)" : "=r"(current));
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current = BOUNDED_1 (current);
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for ( count = 0;
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current != NULL && count < size;
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current = BOUNDED_1 (current->next), count++)
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array[count] = current->return_address;
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/* It's possible the second-last stack frame can't return
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(that is, it's __libc_start_main), in which case
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the CRT startup code will have set its LR to 'NULL'. */
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if (count > 0 && array[count-1] == NULL)
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count--;
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return count;
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}
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weak_alias (__backtrace, backtrace)
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