xref: /OK3568_Linux_fs/kernel/arch/x86/lib/error-inject.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun 
3*4882a593Smuzhiyun #include <linux/linkage.h>
4*4882a593Smuzhiyun #include <linux/error-injection.h>
5*4882a593Smuzhiyun #include <linux/kprobes.h>
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun asmlinkage void just_return_func(void);
8*4882a593Smuzhiyun 
9*4882a593Smuzhiyun asm(
10*4882a593Smuzhiyun 	".text\n"
11*4882a593Smuzhiyun 	".type just_return_func, @function\n"
12*4882a593Smuzhiyun 	".globl just_return_func\n"
13*4882a593Smuzhiyun 	"just_return_func:\n"
14*4882a593Smuzhiyun 		ASM_RET
15*4882a593Smuzhiyun 	".size just_return_func, .-just_return_func\n"
16*4882a593Smuzhiyun );
17*4882a593Smuzhiyun 
override_function_with_return(struct pt_regs * regs)18*4882a593Smuzhiyun void override_function_with_return(struct pt_regs *regs)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun 	regs->ip = (unsigned long)&just_return_func;
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun NOKPROBE_SYMBOL(override_function_with_return);
23