arch/x86/lib/error-inject.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/linkage.h>
   4 #include <linux/error-injection.h>
   5 #include <linux/kprobes.h>
   6 #include <linux/objtool.h>
   7
   8 asmlinkage void just_return_func(void);
   9
  10 asm(
  11         ".text\n"
  12         ".type just_return_func, @function\n"
  13         ".globl just_return_func\n"
  14         ASM_FUNC_ALIGN
  15         "just_return_func:\n"
  16                 ANNOTATE_NOENDBR
  17                 ASM_RET
  18         ".size just_return_func, .-just_return_func\n"
  19 );
  20
  21 void override_function_with_return(struct pt_regs *regs)
  22 {
  23         regs->ip = (unsigned long)&just_return_func;
  24 }
  25 NOKPROBE_SYMBOL(override_function_with_return);