mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-23 02:54:32 +08:00
e7438c4b89
Given a function, get_frame_info() analyzes its instructions to figure out frame size and return address. get_frame_info() works as follows: 1. analyze up to 128 instructions if the function size is unknown 2. search for 'addiu/daddiu sp,sp,-immed' for frame size 3. search for 'sw ra,offset(sp)' for return address 4. end search when it sees jr/jal/jalr This leads to an issue when the given function is a sibling call, example shown as follows. 801ca110 <schedule>: 801ca110: 8f820000 lw v0,0(gp) 801ca114: 8c420000 lw v0,0(v0) 801ca118: 080726f0 j 801c9bc0 <__schedule> 801ca11c: 00000000 nop 801ca120 <io_schedule>: 801ca120: 27bdffe8 addiu sp,sp,-24 801ca124: 3c028022 lui v0,0x8022 801ca128: afbf0014 sw ra,20(sp) In this case, get_frame_info() cannot properly detect schedule's frame info, and eventually returns io_schedule's instead. This patch adds 'j' to the end search condition to workaround sibling call cases. Signed-off-by: Tony Wu <tung7970@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5236/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> |
||
|---|---|---|
| .. | ||
| alpha | ||
| arc | ||
| arm | ||
| arm64 | ||
| avr32 | ||
| blackfin | ||
| c6x | ||
| cris | ||
| frv | ||
| h8300 | ||
| hexagon | ||
| ia64 | ||
| m32r | ||
| m68k | ||
| metag | ||
| microblaze | ||
| mips | ||
| mn10300 | ||
| openrisc | ||
| parisc | ||
| powerpc | ||
| s390 | ||
| score | ||
| sh | ||
| sparc | ||
| tile | ||
| um | ||
| unicore32 | ||
| x86 | ||
| xtensa | ||
| .gitignore | ||
| Kconfig | ||