cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ftrace-direct-multi.c (2052B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2#include <linux/module.h>
      3
      4#include <linux/mm.h> /* for handle_mm_fault() */
      5#include <linux/ftrace.h>
      6#include <linux/sched/stat.h>
      7#include <asm/asm-offsets.h>
      8
      9extern void my_direct_func(unsigned long ip);
     10
     11void my_direct_func(unsigned long ip)
     12{
     13	trace_printk("ip %lx\n", ip);
     14}
     15
     16extern void my_tramp(void *);
     17
     18#ifdef CONFIG_X86_64
     19
     20#include <asm/ibt.h>
     21
     22asm (
     23"	.pushsection    .text, \"ax\", @progbits\n"
     24"	.type		my_tramp, @function\n"
     25"	.globl		my_tramp\n"
     26"   my_tramp:"
     27	ASM_ENDBR
     28"	pushq %rbp\n"
     29"	movq %rsp, %rbp\n"
     30"	pushq %rdi\n"
     31"	movq 8(%rbp), %rdi\n"
     32"	call my_direct_func\n"
     33"	popq %rdi\n"
     34"	leave\n"
     35	ASM_RET
     36"	.size		my_tramp, .-my_tramp\n"
     37"	.popsection\n"
     38);
     39
     40#endif /* CONFIG_X86_64 */
     41
     42#ifdef CONFIG_S390
     43
     44asm (
     45"	.pushsection	.text, \"ax\", @progbits\n"
     46"	.type		my_tramp, @function\n"
     47"	.globl		my_tramp\n"
     48"   my_tramp:"
     49"	lgr		%r1,%r15\n"
     50"	stmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
     51"	stg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
     52"	aghi		%r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
     53"	stg		%r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
     54"	lgr		%r2,%r0\n"
     55"	brasl		%r14,my_direct_func\n"
     56"	aghi		%r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
     57"	lmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
     58"	lg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
     59"	lgr		%r1,%r0\n"
     60"	br		%r1\n"
     61"	.size		my_tramp, .-my_tramp\n"
     62"	.popsection\n"
     63);
     64
     65#endif /* CONFIG_S390 */
     66
     67static struct ftrace_ops direct;
     68
     69static int __init ftrace_direct_multi_init(void)
     70{
     71	ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0);
     72	ftrace_set_filter_ip(&direct, (unsigned long) schedule, 0, 0);
     73
     74	return register_ftrace_direct_multi(&direct, (unsigned long) my_tramp);
     75}
     76
     77static void __exit ftrace_direct_multi_exit(void)
     78{
     79	unregister_ftrace_direct_multi(&direct, (unsigned long) my_tramp);
     80}
     81
     82module_init(ftrace_direct_multi_init);
     83module_exit(ftrace_direct_multi_exit);
     84
     85MODULE_AUTHOR("Jiri Olsa");
     86MODULE_DESCRIPTION("Example use case of using register_ftrace_direct_multi()");
     87MODULE_LICENSE("GPL");