xref: /openbmc/linux/arch/mips/include/asm/kprobes.h (revision b98cca44)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *  Kernel Probes (KProbes)
4  *  include/asm-mips/kprobes.h
5  *
6  *  Copyright 2006 Sony Corp.
7  *  Copyright 2010 Cavium Networks
8  */
9 
10 #ifndef _ASM_KPROBES_H
11 #define _ASM_KPROBES_H
12 
13 #include <asm-generic/kprobes.h>
14 
15 #ifdef CONFIG_KPROBES
16 #include <linux/ptrace.h>
17 #include <linux/types.h>
18 
19 #include <asm/cacheflush.h>
20 #include <asm/kdebug.h>
21 #include <asm/inst.h>
22 
23 #define	 __ARCH_WANT_KPROBES_INSN_SLOT
24 
25 struct kprobe;
26 struct pt_regs;
27 
28 typedef union mips_instruction kprobe_opcode_t;
29 
30 #define MAX_INSN_SIZE 2
31 
32 #define flush_insn_slot(p)						\
33 do {									\
34 	if (p->addr)							\
35 		flush_icache_range((unsigned long)p->addr,		\
36 			   (unsigned long)p->addr +			\
37 			   (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)));	\
38 } while (0)
39 
40 
41 #define kretprobe_blacklist_size 0
42 
43 void arch_remove_kprobe(struct kprobe *p);
44 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
45 
46 /* Architecture specific copy of original instruction*/
47 struct arch_specific_insn {
48 	/* copy of the original instruction */
49 	kprobe_opcode_t *insn;
50 };
51 
52 struct prev_kprobe {
53 	struct kprobe *kp;
54 	unsigned long status;
55 	unsigned long old_SR;
56 	unsigned long saved_SR;
57 	unsigned long saved_epc;
58 };
59 
60 #define SKIP_DELAYSLOT 0x0001
61 
62 /* per-cpu kprobe control block */
63 struct kprobe_ctlblk {
64 	unsigned long kprobe_status;
65 	unsigned long kprobe_old_SR;
66 	unsigned long kprobe_saved_SR;
67 	unsigned long kprobe_saved_epc;
68 	/* Per-thread fields, used while emulating branches */
69 	unsigned long flags;
70 	unsigned long target_epc;
71 	struct prev_kprobe prev_kprobe;
72 };
73 
74 extern int kprobe_exceptions_notify(struct notifier_block *self,
75 				    unsigned long val, void *data);
76 
77 #endif /* CONFIG_KPROBES */
78 #endif /* _ASM_KPROBES_H */
79