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Diffstat (limited to 'sysdeps/powerpc/powerpc64/backtrace.c')
-rw-r--r-- | sysdeps/powerpc/powerpc64/backtrace.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c new file mode 100644 index 0000000000..8669b6a689 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/backtrace.c @@ -0,0 +1,69 @@ +/* Return backtrace of current program state. + Copyright (C) 1998, 2000, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <execinfo.h> +#include <stddef.h> +#include <bp-checks.h> + +/* This is the stack layout we see with every stack frame. + Note that every routine is required by the ABI to lay out the stack + like this. + + +----------------+ +-----------------+ + %r1 -> | %r1 last frame--------> | %r1 last frame--->... --> NULL + | | | | + | cr save | | cr save | + | | | | + | (unused) | | return address | + +----------------+ +-----------------+ +*/ +struct layout +{ + struct layout *__unbounded next; + long condition_register; + void *__unbounded return_address; +}; + +int +__backtrace (void **array, int size) +{ + struct layout *current; + int count; + + /* Force gcc to spill LR. */ + asm volatile ("" : "=l"(current)); + + /* Get the address on top-of-stack. */ + asm volatile ("ld %0,0(1)" : "=r"(current)); + current = BOUNDED_1 (current); + + for ( count = 0; + current != NULL && count < size; + current = BOUNDED_1 (current->next), count++) + array[count] = current->return_address; + + /* It's possible the second-last stack frame can't return + (that is, it's __libc_start_main), in which case + the CRT startup code will have set its LR to 'NULL'. */ + if (count > 0 && array[count-1] == NULL) + count--; + + return count; +} +weak_alias (__backtrace, backtrace) |