| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Steven Rostedt | 267 | 57.17% | 1 | 7.69% |
| Naveen N Rao | 105 | 22.48% | 1 | 7.69% |
| Florent Revest | 40 | 8.57% | 3 | 23.08% |
| Heiko Carstens | 24 | 5.14% | 1 | 7.69% |
| Youling Tang | 8 | 1.71% | 1 | 7.69% |
| Jiri Olsa | 6 | 1.28% | 1 | 7.69% |
| Song Shuai | 5 | 1.07% | 1 | 7.69% |
| Ruiqi Gong | 5 | 1.07% | 1 | 7.69% |
| Peter Zijlstra | 4 | 0.86% | 2 | 15.38% |
| Daniel Borkmann | 3 | 0.64% | 1 | 7.69% |
| Total | 467 | 13 |
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// SPDX-License-Identifier: GPL-2.0-only #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); void my_direct_func1(void) { trace_printk("my direct func1\n"); } void my_direct_func2(void) { trace_printk("my direct func2\n"); } extern void my_tramp1(void *); 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 " .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 " .size my_tramp2, .-my_tramp2\n" " .popsection\n" ); #endif /* CONFIG_X86_64 */ #ifdef CONFIG_S390 asm ( " .pushsection .text, \"ax\", @progbits\n" " .type my_tramp1, @function\n" " .globl my_tramp1\n" " my_tramp1:" " 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_func1\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_tramp1, .-my_tramp1\n" " .type my_tramp2, @function\n" " .globl my_tramp2\n" " my_tramp2:" " 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_func2\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_tramp2, .-my_tramp2\n" " .popsection\n" ); #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, (unsigned long)my_tramp2, }; static int simple_thread(void *arg) { static int t; int ret = 0; while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(2 * HZ); if (ret) continue; t ^= 1; ret = modify_ftrace_direct(&direct, tramps[t]); if (!ret) my_tramp = tramps[t]; WARN_ON_ONCE(ret); } return 0; } static struct task_struct *simple_tsk; static int __init ftrace_direct_init(void) { int ret; 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; } static void __exit ftrace_direct_exit(void) { kthread_stop(simple_tsk); unregister_ftrace_direct(&direct, my_tramp, true); } module_init(ftrace_direct_init); module_exit(ftrace_direct_exit); MODULE_AUTHOR("Steven Rostedt"); MODULE_DESCRIPTION("Example use case of using modify_ftrace_direct()"); MODULE_LICENSE("GPL");
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