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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>
This commit is contained in:
Youling Tang 2023-05-01 17:19:53 +08:00 committed by Huacai Chen
parent 9cdc3b6a29
commit 22f367a689
6 changed files with 152 additions and 0 deletions
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2
arch/loongarch/Kconfig
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@ -120,6 +120,8 @@ config LOONGARCH
select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RSEQ
select HAVE_SAMPLE_FTRACE_DIRECT
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
select HAVE_SETUP_PER_CPU_AREA if NUMA
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS

34
samples/ftrace/ftrace-direct-modify.c
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@ -96,6 +96,40 @@ asm (
#endif /* CONFIG_S390 */
#ifdef CONFIG_LOONGARCH
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp1, @function\n"
" .globl my_tramp1\n"
" my_tramp1:\n"
" addi.d $sp, $sp, -16\n"
" 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"
" addi.d $sp, $sp, 16\n"
" jr $t0\n"
" .size my_tramp1, .-my_tramp1\n"
" .type my_tramp2, @function\n"
" .globl my_tramp2\n"
" my_tramp2:\n"
" addi.d $sp, $sp, -16\n"
" 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"
" addi.d $sp, $sp, 16\n"
" jr $t0\n"
" .size my_tramp2, .-my_tramp2\n"
" .popsection\n"
);
#endif /* CONFIG_LOONGARCH */
static unsigned long my_tramp = (unsigned long)my_tramp1;
static unsigned long tramps[2] = {
(unsigned long)my_tramp1,

41
samples/ftrace/ftrace-direct-multi-modify.c
View File

@ -103,6 +103,47 @@ asm (
#endif /* CONFIG_S390 */
#ifdef CONFIG_LOONGARCH
#include <asm/asm.h>
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp1, @function\n"
" .globl my_tramp1\n"
" my_tramp1:\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"
" 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"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp1, .-my_tramp1\n"
" .type my_tramp2, @function\n"
" .globl my_tramp2\n"
" my_tramp2:\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"
" 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"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp2, .-my_tramp2\n"
" .popsection\n"
);
#endif /* CONFIG_LOONGARCH */
static unsigned long my_tramp = (unsigned long)my_tramp1;
static unsigned long tramps[2] = {
(unsigned long)my_tramp1,

25
samples/ftrace/ftrace-direct-multi.c
View File

@ -66,6 +66,31 @@ asm (
#endif /* CONFIG_S390 */
#ifdef CONFIG_LOONGARCH
#include <asm/asm.h>
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"
" 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"
" addi.d $sp, $sp, 32\n"
" jr $t0\n"
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);
#endif /* CONFIG_LOONGARCH */
static struct ftrace_ops direct;
static int __init ftrace_direct_multi_init(void)

27
samples/ftrace/ftrace-direct-too.c
View File

@ -70,6 +70,33 @@ 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, -48\n"
" st.d $a0, $sp, 0\n"
" st.d $a1, $sp, 8\n"
" st.d $a2, $sp, 16\n"
" st.d $t0, $sp, 24\n"
" st.d $ra, $sp, 32\n"
" bl my_direct_func\n"
" 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"
" addi.d $sp, $sp, 48\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)handle_mm_fault,

23
samples/ftrace/ftrace-direct.c
View File

@ -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,