// SPDX-License-Identifier: GPL-2.0-only #include <linux/module.h> #include <linux/kthread.h> #include <linux/ftrace.h> #ifndef CONFIG_ARM64 #include <asm/asm-offsets.h> #endif extern void my_direct_func1(unsigned long ip); extern void my_direct_func2(unsigned long ip); void my_direct_func1(unsigned long ip) { … } void my_direct_func2(unsigned long ip) { … } extern void my_tramp1(void *); extern void my_tramp2(void *); #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,-3*"SZREG"\n" " "REG_S" a0,0*"SZREG"(sp)\n" " "REG_S" t0,1*"SZREG"(sp)\n" " "REG_S" ra,2*"SZREG"(sp)\n" " mv a0,t0\n" " call my_direct_func1\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_tramp1, .-my_tramp1\n" " .type my_tramp2, @function\n" " .globl my_tramp2\n" " my_tramp2:\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" " mv a0,t0\n" " call my_direct_func2\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_tramp2, .-my_tramp2\n" " .popsection\n" ); #endif /* CONFIG_RISCV */ #ifdef CONFIG_X86_64 #include <asm/ibt.h> #include <asm/nospec-branch.h> asm …; #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" " lgr %r2,%r0\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" "\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" " lgr %r2,%r0\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, #32\n" " stp x9, x30, [sp]\n" " str x0, [sp, #16]\n" " mov x0, x30\n" " bl my_direct_func1\n" " ldp x30, x9, [sp]\n" " ldr x0, [sp, #16]\n" " add sp, sp, #32\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, #32\n" " stp x9, x30, [sp]\n" " str x0, [sp, #16]\n" " mov x0, x30\n" " bl my_direct_func2\n" " ldp x30, x9, [sp]\n" " ldr x0, [sp, #16]\n" " add sp, sp, #32\n" " ret x9\n" " .size my_tramp2, .-my_tramp2\n" " .popsection\n" ); #endif /* CONFIG_ARM64 */ #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 = …; static unsigned long tramps[2] = …; static struct ftrace_ops direct; static int simple_thread(void *arg) { … } static struct task_struct *simple_tsk; static int __init ftrace_direct_multi_init(void) { … } static void __exit ftrace_direct_multi_exit(void) { … } module_init(ftrace_direct_multi_init); module_exit(ftrace_direct_multi_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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