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Diffstat (limited to 'sysdeps/powerpc/powerpc32/backtrace.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/backtrace.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/sysdeps/powerpc/powerpc32/backtrace.c b/sysdeps/powerpc/powerpc32/backtrace.c deleted file mode 100644 index 394062136c..0000000000 --- a/sysdeps/powerpc/powerpc32/backtrace.c +++ /dev/null @@ -1,131 +0,0 @@ -/* Return backtrace of current program state. - Copyright (C) 1998-2017 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 Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <execinfo.h> -#include <stddef.h> -#include <string.h> -#include <signal.h> -#include <libc-vdso.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 - | | | | - | (unused) | | return address | - +----------------+ +-----------------+ -*/ -struct layout -{ - struct layout *next; - void *return_address; -}; - -#define SIGNAL_FRAMESIZE 64 - -/* Since the signal handler is just like any other function it needs to - save/restore its LR and it will save it into callers stack frame. - Since a signal handler doesn't have a caller, the kernel creates a - dummy frame to make it look like it has a caller. */ -struct signal_frame_32 { - char dummy[SIGNAL_FRAMESIZE]; - struct sigcontext sctx; - mcontext_t mctx; - /* We don't care about the rest, since IP value is at 'mctx' field. */ -}; - -static inline int -is_sigtramp_address (void *nip) -{ -#ifdef SHARED - if (nip == VDSO_SYMBOL (sigtramp32)) - return 1; -#endif - return 0; -} - -struct rt_signal_frame_32 { - char dummy[SIGNAL_FRAMESIZE + 16]; - siginfo_t info; - struct ucontext uc; - /* We don't care about the rest, since IP value is at 'uc' field. */ -}; - -static inline int -is_sigtramp_address_rt (void * nip) -{ -#ifdef SHARED - if (nip == VDSO_SYMBOL (sigtramp_rt32)) - return 1; -#endif - return 0; -} - -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 ("lwz %0,0(1)" : "=r"(current)); - - for ( count = 0; - current != NULL && count < size; - current = current->next, count++) - { - gregset_t *gregset = NULL; - - array[count] = current->return_address; - - /* Check if the symbol is the signal trampoline and get the interrupted - * symbol address from the trampoline saved area. */ - if (is_sigtramp_address (current->return_address)) - { - struct signal_frame_32 *sigframe = - (struct signal_frame_32*) current; - gregset = &sigframe->mctx.gregs; - } - else if (is_sigtramp_address_rt (current->return_address)) - { - struct rt_signal_frame_32 *sigframe = - (struct rt_signal_frame_32*) current; - gregset = &sigframe->uc.uc_mcontext.uc_regs->gregs; - } - if (gregset) - { - array[++count] = (void*)((*gregset)[PT_NIP]); - current = (void*)((*gregset)[PT_R1]); - } - } - - /* 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) -libc_hidden_def (__backtrace) |