diff options
Diffstat (limited to 'gdb/rs6000-tdep.c')
| -rw-r--r-- | gdb/rs6000-tdep.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c index 4d1b73a..5aa7632 100644 --- a/gdb/rs6000-tdep.c +++ b/gdb/rs6000-tdep.c @@ -1091,6 +1091,33 @@ frame_initial_stack_address (fi) return fi->initial_sp = read_register (fdata.alloca_reg); } +FRAME_ADDR +rs6000_frame_chain (thisframe) + struct frame_info *thisframe; +{ + FRAME_ADDR fp; + if (inside_entry_file ((thisframe)->pc)) + return 0; + fp = read_memory_integer ((thisframe)->frame, 4); + if (fp == 0 && thisframe->pc < TEXT_SEGMENT_BASE) + { + /* If we are doing a backtrace from a signal handler, fp will be 0 + and thisframe->pc will be something like 0x3f88 or 0x2790. */ + + /* This was determined by experimentation on AIX 3.2. Perhaps + it corresponds to some offset in /usr/include/sys/user.h or + something like that. Using some system include file would + have the advantage of probably being more robust in the face + of OS upgrades, but the disadvantage of being wrong for + cross-debugging. */ + +#define SIG_FRAME_FP_OFFSET 284 + fp = read_memory_integer (thisframe->frame + SIG_FRAME_FP_OFFSET, 4); + } + return fp; +} + + /* xcoff_relocate_symtab - hook for symbol table relocation. also reads shared libraries.. */ |