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| author |  Youling Tang <tangyouling@loongson.cn>
| 2023-05-01 17:19:53 +0800 |
|---|---|---|
| committer |  Huacai Chen <chenhuacai@loongson.cn>
| 2023-05-01 17:19:53 +0800 |
| commit | 22f367a689ceceb08d9ce6a65c43c9640f5cb935 (patch) | |
| tree | 7147bf854ddf5513492435dfdb2fa041da76e829 /samples/ftrace/ftrace-direct.c | |
| parent | LoongArch: ftrace: Add direct call support (diff) | |
| download | linux-22f367a689ceceb08d9ce6a65c43c9640f5cb935.tar.gz linux-22f367a689ceceb08d9ce6a65c43c9640f5cb935.tar.bz2 linux-22f367a689ceceb08d9ce6a65c43c9640f5cb935.zip | |
LoongArch: ftrace: Add direct call trampoline samples support
The ftrace samples need per-architecture trampoline implementations to
save and restore argument registers around the calls to my_direct_func*
and to restore polluted registers (e.g: ra).
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'samples/ftrace/ftrace-direct.c')
| -rw-r--r-- | samples/ftrace/ftrace-direct.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c index 1d3d307ca33d..9be720957bf8 100644 --- a/samples/ftrace/ftrace-direct.c +++ b/samples/ftrace/ftrace-direct.c @@ -63,6 +63,29 @@ asm ( #endif /* CONFIG_S390 */ +#ifdef CONFIG_LOONGARCH + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" +" addi.d $sp, $sp, -32\n" +" st.d $a0, $sp, 0\n" +" st.d $t0, $sp, 8\n" +" 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" +" addi.d $sp, $sp, 32\n" +" jr $t0\n" +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_LOONGARCH */ + static int __init ftrace_direct_init(void) { return register_ftrace_direct((unsigned long)wake_up_process, |