xref: /OK3568_Linux_fs/kernel/arch/arm64/mm/extable.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * Based on arch/arm/mm/extable.c
4*4882a593Smuzhiyun  */
5*4882a593Smuzhiyun 
6*4882a593Smuzhiyun #include <linux/extable.h>
7*4882a593Smuzhiyun #include <linux/uaccess.h>
8*4882a593Smuzhiyun 
fixup_exception(struct pt_regs * regs)9*4882a593Smuzhiyun int fixup_exception(struct pt_regs *regs)
10*4882a593Smuzhiyun {
11*4882a593Smuzhiyun 	const struct exception_table_entry *fixup;
12*4882a593Smuzhiyun 	unsigned long addr;
13*4882a593Smuzhiyun 
14*4882a593Smuzhiyun 	addr = instruction_pointer(regs);
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun 	/* Search the BPF tables first, these are formatted differently */
17*4882a593Smuzhiyun 	fixup = search_bpf_extables(addr);
18*4882a593Smuzhiyun 	if (fixup)
19*4882a593Smuzhiyun 		return arm64_bpf_fixup_exception(fixup, regs);
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun 	fixup = search_exception_tables(addr);
22*4882a593Smuzhiyun 	if (!fixup)
23*4882a593Smuzhiyun 		return 0;
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun 	regs->pc = (unsigned long)&fixup->fixup + fixup->fixup;
26*4882a593Smuzhiyun 	return 1;
27*4882a593Smuzhiyun }
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