| /* |
| * backtrace support (this is a modified lib/x86/stack.c) |
| * |
| * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU LGPL, version 2. |
| */ |
| #include <libcflat.h> |
| #include <stack.h> |
| |
| int backtrace_frame(const void *frame, const void **return_addrs, |
| int max_depth) |
| { |
| static int walking; |
| int depth; |
| const unsigned long *fp = (unsigned long *)frame; |
| |
| if (walking) { |
| printf("RECURSIVE STACK WALK!!!\n"); |
| return 0; |
| } |
| walking = 1; |
| |
| for (depth = 0; depth < max_depth; depth++) { |
| if (!fp) |
| break; |
| return_addrs[depth] = (void *)fp[0]; |
| if (return_addrs[depth] == 0) |
| break; |
| fp = (unsigned long *)fp[-1]; |
| } |
| |
| walking = 0; |
| return depth; |
| } |
| |
| int backtrace(const void **return_addrs, int max_depth) |
| { |
| return backtrace_frame(__builtin_frame_address(0), |
| return_addrs, max_depth); |
| } |