Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Steven Rostedt |
114 |
57.87% |
1 |
7.69% |
| Florent Revest |
35 |
17.77% |
3 |
23.08% |
| Heiko Carstens |
22 |
11.17% |
1 |
7.69% |
| Youling Tang |
8 |
4.06% |
1 |
7.69% |
| Song Shuai |
5 |
2.54% |
1 |
7.69% |
| Peter Zijlstra |
4 |
2.03% |
2 |
15.38% |
| Daniel Borkmann |
3 |
1.52% |
1 |
7.69% |
| Ruiqi Gong |
3 |
1.52% |
1 |
7.69% |
| Jiri Olsa |
2 |
1.02% |
1 |
7.69% |
| Colin Ian King |
1 |
0.51% |
1 |
7.69% |
| Total |
197 |
|
13 |
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/sched.h> /* for wake_up_process() */
#include <linux/ftrace.h>
#ifndef CONFIG_ARM64
#include <asm/asm-offsets.h>
#endif
extern void my_direct_func(struct task_struct *p);
void my_direct_func(struct task_struct *p)
{
trace_printk("waking up %s-%d\n", p->comm, p->pid);
}
extern void my_tramp(void *);
#ifdef CONFIG_RISCV
#include <asm/asm.h>
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp, @function\n"
" .globl my_tramp\n"
" my_tramp:\n"
" addi sp,sp,-3*"SZREG"\n"
" "REG_S" a0,0*"SZREG"(sp)\n"
" "REG_S" t0,1*"SZREG"(sp)\n"
" "REG_S" ra,2*"SZREG"(sp)\n"
" call my_direct_func\n"
" "REG_L" a0,0*"SZREG"(sp)\n"
" "REG_L" t0,1*"SZREG"(sp)\n"
" "REG_L" ra,2*"SZREG"(sp)\n"
" addi sp,sp,3*"SZREG"\n"
" jr t0\n"
" .size my_tramp, .-my_tramp\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_tramp, @function\n"
" .globl my_tramp\n"
" my_tramp:"
ASM_ENDBR
" pushq %rbp\n"
" movq %rsp, %rbp\n"
CALL_DEPTH_ACCOUNT
" pushq %rdi\n"
" call my_direct_func\n"
" popq %rdi\n"
" leave\n"
ASM_RET
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);
#endif /* CONFIG_X86_64 */
#ifdef CONFIG_S390
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp, @function\n"
" .globl my_tramp\n"
" my_tramp:"
" lgr %r1,%r15\n"
" stmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
" stg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
" aghi %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
" stg %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
" brasl %r14,my_direct_func\n"
" aghi %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
" lmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
" lg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
" lgr %r1,%r0\n"
" br %r1\n"
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);
#endif /* CONFIG_S390 */
#ifdef CONFIG_ARM64
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp, @function\n"
" .globl my_tramp\n"
" my_tramp:"
" hint 34\n" // bti c
" sub sp, sp, #32\n"
" stp x9, x30, [sp]\n"
" str x0, [sp, #16]\n"
" bl my_direct_func\n"
" ldp x30, x9, [sp]\n"
" ldr x0, [sp, #16]\n"
" add sp, sp, #32\n"
" ret x9\n"
" .size my_tramp, .-my_tramp\n"
" .popsection\n"
);
#endif /* CONFIG_ARM64 */
#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 struct ftrace_ops direct;
static int __init ftrace_direct_init(void)
{
ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0);
return register_ftrace_direct(&direct, (unsigned long) my_tramp);
}
static void __exit ftrace_direct_exit(void)
{
unregister_ftrace_direct(&direct, (unsigned long)my_tramp, true);
}
module_init(ftrace_direct_init);
module_exit(ftrace_direct_exit);
MODULE_AUTHOR("Steven Rostedt");
MODULE_DESCRIPTION("Example use case of using register_ftrace_direct()");
MODULE_LICENSE("GPL");