1 /*
2 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
3 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
4 *
5 * SPDX-License-Identifier: GPL-2.0
6 */
7 #ifndef _ASM_PTRACE_H
8 #define _ASM_PTRACE_H
9
10 #include <linux/compiler.h>
11 #include <linux/types.h>
12 #include <asm/isadep.h>
13
14 /*
15 * This struct defines the way the registers are stored on the stack during a
16 * system call/exception. As usual the registers k0/k1 aren't being saved.
17 *
18 * If you add a register here, also add it to regoffset_table[] in
19 * arch/mips/kernel/ptrace.c.
20 */
21 struct pt_regs {
22 #ifdef CONFIG_32BIT
23 /* Pad bytes for argument save space on the stack. */
24 unsigned long pad0[8];
25 #endif
26
27 /* Saved main processor registers. */
28 unsigned long regs[32];
29
30 /* Saved special registers. */
31 unsigned long cp0_status;
32 unsigned long hi;
33 unsigned long lo;
34 #ifdef CONFIG_CPU_HAS_SMARTMIPS
35 unsigned long acx;
36 #endif
37 unsigned long cp0_badvaddr;
38 unsigned long cp0_cause;
39 unsigned long cp0_epc;
40 #ifdef CONFIG_CPU_CAVIUM_OCTEON
41 unsigned long long mpl[6]; /* MTM{0-5} */
42 unsigned long long mtp[6]; /* MTP{0-5} */
43 #endif
44 unsigned long __last[0];
45 } __aligned(8);
46
kernel_stack_pointer(struct pt_regs * regs)47 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
48 {
49 return regs->regs[31];
50 }
51
52 /*
53 * Don't use asm-generic/ptrace.h it defines FP accessors that don't make
54 * sense on MIPS. We rather want an error if they get invoked.
55 */
56
instruction_pointer_set(struct pt_regs * regs,unsigned long val)57 static inline void instruction_pointer_set(struct pt_regs *regs,
58 unsigned long val)
59 {
60 regs->cp0_epc = val;
61 }
62
63 /* Query offset/name of register from its name/offset */
64 extern int regs_query_register_offset(const char *name);
65 #define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
66
67 /**
68 * regs_get_register() - get register value from its offset
69 * @regs: pt_regs from which register value is gotten.
70 * @offset: offset number of the register.
71 *
72 * regs_get_register returns the value of a register. The @offset is the
73 * offset of the register in struct pt_regs address which specified by @regs.
74 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
75 */
regs_get_register(struct pt_regs * regs,unsigned int offset)76 static inline unsigned long regs_get_register(struct pt_regs *regs,
77 unsigned int offset)
78 {
79 if (unlikely(offset > MAX_REG_OFFSET))
80 return 0;
81
82 return *(unsigned long *)((unsigned long)regs + offset);
83 }
84
85 /*
86 * Does the process account for user or for system time?
87 */
88 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
89
90 #define instruction_pointer(regs) ((regs)->cp0_epc)
91 #define profile_pc(regs) instruction_pointer(regs)
92
93 /* Helpers for working with the user stack pointer */
94
user_stack_pointer(struct pt_regs * regs)95 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
96 {
97 return regs->regs[29];
98 }
99
user_stack_pointer_set(struct pt_regs * regs,unsigned long val)100 static inline void user_stack_pointer_set(struct pt_regs *regs,
101 unsigned long val)
102 {
103 regs->regs[29] = val;
104 }
105
106 #endif /* _ASM_PTRACE_H */
107