LoongArch: ptrace: Add function argument access API

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Add regs_get_argument() which returns N th argument of the function
call, This enables ftrace kprobe events to access kernel function
arguments via $argN syntax for later use.

E.g.:
echo 'p bio_add_page arg1=$arg1' > kprobe_events
bash: echo: write error: Invalid argument

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

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Qing Zhang 2023-02-25 15:52:57 +08:00 • committed by Huacai Chen

parent 1a69f7a161

commit 356bd6f236

2 changed files with 35 additions and 0 deletions

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1

arch/loongarch/Kconfig

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34

arch/loongarch/include/asm/ptrace.h

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