LoongArch: Add USER_STACKTRACE support

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To get the best stacktrace output, you can compile your userspace
programs with frame pointers (at least glibc + the app you are tracing).

1, export "CC = gcc -fno-omit-frame-pointer";
2, compile your programs with "CC";
3, use uprobe to get stacktrace output.

...
     echo 'p:malloc /usr/lib64/libc.so.6:0x0a4704 size=%r4:u64' > uprobe_events
     echo 'p:free /usr/lib64/libc.so.6:0x0a4d50 ptr=%r4:x64' >> uprobe_events
     echo 'comm == "demo"' > ./events/uprobes/malloc/filter
     echo 'comm == "demo"' > ./events/uprobes/free/filter
     echo 1 > ./options/userstacktrace
     echo 1 > ./options/sym-userobj
...

Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

...

This commit is contained in:

Qing Zhang 2022-08-06 16:10:05 +08:00 • committed by Huacai Chen

parent 93a4fa622e

commit 4d7bf939df

3 changed files with 47 additions and 0 deletions

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1

arch/loongarch/Kconfig

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5

arch/loongarch/include/asm/stacktrace.h

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41

arch/loongarch/kernel/stacktrace.c

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