From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- samples/ftrace/ftrace-direct-multi.c | 88 ++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 samples/ftrace/ftrace-direct-multi.c (limited to 'samples/ftrace/ftrace-direct-multi.c') diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c new file mode 100644 index 000000000..a9a5c90fb --- /dev/null +++ b/samples/ftrace/ftrace-direct-multi.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include + +#include /* for handle_mm_fault() */ +#include +#include +#include + +extern void my_direct_func(unsigned long ip); + +void my_direct_func(unsigned long ip) +{ + trace_printk("ip %lx\n", ip); +} + +extern void my_tramp(void *); + +#ifdef CONFIG_X86_64 + +#include + +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" +" pushq %rdi\n" +" movq 8(%rbp), %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" +" lgr %r2,%r0\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 */ + +static struct ftrace_ops direct; + +static int __init ftrace_direct_multi_init(void) +{ + ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0); + ftrace_set_filter_ip(&direct, (unsigned long) schedule, 0, 0); + + return register_ftrace_direct_multi(&direct, (unsigned long) my_tramp); +} + +static void __exit ftrace_direct_multi_exit(void) +{ + unregister_ftrace_direct_multi(&direct, (unsigned long) my_tramp); + ftrace_free_filter(&direct); +} + +module_init(ftrace_direct_multi_init); +module_exit(ftrace_direct_multi_exit); + +MODULE_AUTHOR("Jiri Olsa"); +MODULE_DESCRIPTION("Example use case of using register_ftrace_direct_multi()"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3