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Diffstat (limited to 'samples/ftrace/ftrace-direct-modify.c')
-rw-r--r--samples/ftrace/ftrace-direct-modify.c206
1 files changed, 202 insertions, 4 deletions
diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index 2c7c31893551..da3a9f2091f5 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -2,7 +2,9 @@
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/ftrace.h>
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
+#endif
extern void my_direct_func1(void);
extern void my_direct_func2(void);
@@ -22,24 +24,67 @@ extern void my_tramp2(void *);
static unsigned long my_ip = (unsigned long)schedule;
+#ifdef CONFIG_RISCV
+#include <asm/asm.h>
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp1, @function\n"
+" .globl my_tramp1\n"
+" my_tramp1:\n"
+" addi sp,sp,-2*"SZREG"\n"
+" "REG_S" t0,0*"SZREG"(sp)\n"
+" "REG_S" ra,1*"SZREG"(sp)\n"
+" call my_direct_func1\n"
+" "REG_L" t0,0*"SZREG"(sp)\n"
+" "REG_L" ra,1*"SZREG"(sp)\n"
+" addi sp,sp,2*"SZREG"\n"
+" jr t0\n"
+" .size my_tramp1, .-my_tramp1\n"
+" .type my_tramp2, @function\n"
+" .globl my_tramp2\n"
+
+" my_tramp2:\n"
+" addi sp,sp,-2*"SZREG"\n"
+" "REG_S" t0,0*"SZREG"(sp)\n"
+" "REG_S" ra,1*"SZREG"(sp)\n"
+" call my_direct_func2\n"
+" "REG_L" t0,0*"SZREG"(sp)\n"
+" "REG_L" ra,1*"SZREG"(sp)\n"
+" addi sp,sp,2*"SZREG"\n"
+" jr t0\n"
+" .size my_tramp2, .-my_tramp2\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
#ifdef CONFIG_X86_64
+#include <asm/ibt.h>
+#include <asm/nospec-branch.h>
+
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp1, @function\n"
" .globl my_tramp1\n"
" my_tramp1:"
+ ASM_ENDBR
" pushq %rbp\n"
" movq %rsp, %rbp\n"
+ CALL_DEPTH_ACCOUNT
" call my_direct_func1\n"
" leave\n"
-" .size my_tramp1, .-my_tramp1\n"
ASM_RET
+" .size my_tramp1, .-my_tramp1\n"
+
" .type my_tramp2, @function\n"
" .globl my_tramp2\n"
" my_tramp2:"
+ ASM_ENDBR
" pushq %rbp\n"
" movq %rsp, %rbp\n"
+ CALL_DEPTH_ACCOUNT
" call my_direct_func2\n"
" leave\n"
ASM_RET
@@ -88,6 +133,157 @@ asm (
#endif /* CONFIG_S390 */
+#ifdef CONFIG_ARM64
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp1, @function\n"
+" .globl my_tramp1\n"
+" my_tramp1:"
+" hint 34\n" // bti c
+" sub sp, sp, #16\n"
+" stp x9, x30, [sp]\n"
+" bl my_direct_func1\n"
+" ldp x30, x9, [sp]\n"
+" add sp, sp, #16\n"
+" ret x9\n"
+" .size my_tramp1, .-my_tramp1\n"
+
+" .type my_tramp2, @function\n"
+" .globl my_tramp2\n"
+" my_tramp2:"
+" hint 34\n" // bti c
+" sub sp, sp, #16\n"
+" stp x9, x30, [sp]\n"
+" bl my_direct_func2\n"
+" ldp x30, x9, [sp]\n"
+" add sp, sp, #16\n"
+" ret x9\n"
+" .size my_tramp2, .-my_tramp2\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_ARM64 */
+
+#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 */
+
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 48
+#else
+#define STACK_FRAME_SIZE 24
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp1, @function\n"
+" .globl my_tramp1\n"
+" my_tramp1:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+" bl my_direct_func1\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+" .size my_tramp1, .-my_tramp1\n"
+
+" .type my_tramp2, @function\n"
+" .globl my_tramp2\n"
+" my_tramp2:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+" bl my_direct_func2\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+" .size my_tramp2, .-my_tramp2\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
+static struct ftrace_ops direct;
+
static unsigned long my_tramp = (unsigned long)my_tramp1;
static unsigned long tramps[2] = {
(unsigned long)my_tramp1,
@@ -106,7 +302,7 @@ static int simple_thread(void *arg)
if (ret)
continue;
t ^= 1;
- ret = modify_ftrace_direct(my_ip, my_tramp, tramps[t]);
+ ret = modify_ftrace_direct(&direct, tramps[t]);
if (!ret)
my_tramp = tramps[t];
WARN_ON_ONCE(ret);
@@ -121,7 +317,9 @@ static int __init ftrace_direct_init(void)
{
int ret;
- ret = register_ftrace_direct(my_ip, my_tramp);
+ ftrace_set_filter_ip(&direct, (unsigned long) my_ip, 0, 0);
+ ret = register_ftrace_direct(&direct, my_tramp);
+
if (!ret)
simple_tsk = kthread_run(simple_thread, NULL, "event-sample-fn");
return ret;
@@ -130,7 +328,7 @@ static int __init ftrace_direct_init(void)
static void __exit ftrace_direct_exit(void)
{
kthread_stop(simple_tsk);
- unregister_ftrace_direct(my_ip, my_tramp);
+ unregister_ftrace_direct(&direct, my_tramp, true);
}
module_init(ftrace_direct_init);
generated by cgit (git 2.34.1) at 2025-12-25 17:49:18 +0000