xref: /openbmc/linux/arch/powerpc/lib/restart_table.c (revision 325678fd)
1 #include <asm/interrupt.h>
2 #include <asm/kprobes.h>
3 
4 struct soft_mask_table_entry {
5 	unsigned long start;
6 	unsigned long end;
7 };
8 
9 struct restart_table_entry {
10 	unsigned long start;
11 	unsigned long end;
12 	unsigned long fixup;
13 };
14 
15 extern struct soft_mask_table_entry __start___soft_mask_table[];
16 extern struct soft_mask_table_entry __stop___soft_mask_table[];
17 
18 extern struct restart_table_entry __start___restart_table[];
19 extern struct restart_table_entry __stop___restart_table[];
20 
21 /* Given an address, look for it in the soft mask table */
search_kernel_soft_mask_table(unsigned long addr)22 bool search_kernel_soft_mask_table(unsigned long addr)
23 {
24 	struct soft_mask_table_entry *smte = __start___soft_mask_table;
25 
26 	while (smte < __stop___soft_mask_table) {
27 		unsigned long start = smte->start;
28 		unsigned long end = smte->end;
29 
30 		if (addr >= start && addr < end)
31 			return true;
32 
33 		smte++;
34 	}
35 	return false;
36 }
37 NOKPROBE_SYMBOL(search_kernel_soft_mask_table);
38 
39 /* Given an address, look for it in the kernel exception table */
search_kernel_restart_table(unsigned long addr)40 unsigned long search_kernel_restart_table(unsigned long addr)
41 {
42 	struct restart_table_entry *rte = __start___restart_table;
43 
44 	while (rte < __stop___restart_table) {
45 		unsigned long start = rte->start;
46 		unsigned long end = rte->end;
47 		unsigned long fixup = rte->fixup;
48 
49 		if (addr >= start && addr < end)
50 			return fixup;
51 
52 		rte++;
53 	}
54 	return 0;
55 }
56 NOKPROBE_SYMBOL(search_kernel_restart_table);
57