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samples/ftrace: Adjust LoongArch register restore order in direct calls

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Ensure that in the ftrace direct call logic, the CPU register state
(with ra = parent return address) is restored to the correct state after
the execution of the custom trampoline function and before returning to
the traced function. Additionally, guarantee the correctness of the jump
logic for jr t0 (traced function address).

Cc: stable@vger.kernel.org
Fixes: 9cdc3b6a29 ("LoongArch: ftrace: Add direct call support")
Reported-by: Youling Tang <tangyouling@kylinos.cn>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Chenghao Duan 2025-12-31 15:19:25 +08:00 • committed by Huacai Chen
parent 73721d8676
commit bb85d206be
5 changed files with 14 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

8
samples/ftrace/ftrace-direct-modify.c
View file

@ -176,8 +176,8 @@ asm (
" st.d $t0, $sp, 0\n"
" st.d $ra, $sp, 8\n"
" bl my_direct_func1\n"
" ld.d $t0, $sp, 0\n"
" ld.d $ra, $sp, 8\n"
" ld.d $ra, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" addi.d $sp, $sp, 16\n"
" jr $t0\n"
" .size my_tramp1, .-my_tramp1\n"
@ -189,8 +189,8 @@ asm (
" st.d $t0, $sp, 0\n"
" st.d $ra, $sp, 8\n"
" bl my_direct_func2\n"
" ld.d $t0, $sp, 0\n"
" ld.d $ra, $sp, 8\n"
" ld.d $ra, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" addi.d $sp, $sp, 16\n"
" jr $t0\n"
" .size my_tramp2, .-my_tramp2\n"

8
samples/ftrace/ftrace-direct-multi-modify.c
View file

@ -199,8 +199,8 @@ asm (
" move $a0, $t0\n"
" bl my_direct_func1\n"
" ld.d $a0, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" ld.d $ra, $sp, 16\n"
" ld.d $ra, $sp, 8\n"
" ld.d $t0, $sp, 16\n"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp1, .-my_tramp1\n"
@ -215,8 +215,8 @@ asm (
" move $a0, $t0\n"
" bl my_direct_func2\n"
" ld.d $a0, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" ld.d $ra, $sp, 16\n"
" ld.d $ra, $sp, 8\n"
" ld.d $t0, $sp, 16\n"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp2, .-my_tramp2\n"

4
samples/ftrace/ftrace-direct-multi.c
View file

@ -131,8 +131,8 @@ asm (
" move $a0, $t0\n"
" bl my_direct_func\n"
" ld.d $a0, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" ld.d $ra, $sp, 16\n"
" ld.d $ra, $sp, 8\n"
" ld.d $t0, $sp, 16\n"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp, .-my_tramp\n"

4
samples/ftrace/ftrace-direct-too.c
View file

@ -143,8 +143,8 @@ asm (
" ld.d $a0, $sp, 0\n"
" ld.d $a1, $sp, 8\n"
" ld.d $a2, $sp, 16\n"
" ld.d $t0, $sp, 24\n"
" ld.d $ra, $sp, 32\n"
" ld.d $ra, $sp, 24\n"
" ld.d $t0, $sp, 32\n"
" addi.d $sp, $sp, 48\n"
" jr $t0\n"
" .size my_tramp, .-my_tramp\n"

4
samples/ftrace/ftrace-direct.c
View file

@ -124,8 +124,8 @@ asm (
" st.d $ra, $sp, 16\n"
" bl my_direct_func\n"
" ld.d $a0, $sp, 0\n"
" ld.d $t0, $sp, 8\n"
" ld.d $ra, $sp, 16\n"
" ld.d $ra, $sp, 8\n"
" ld.d $t0, $sp, 16\n"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp, .-my_tramp\n"