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1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 * et al.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#ifndef __ASM_OPENRISC_PTRACE_H
20#define __ASM_OPENRISC_PTRACE_H
21
22#include <asm/spr_defs.h>
23
24#ifndef __ASSEMBLY__
25/*
26 * This is the layout of the regset returned by the GETREGSET ptrace call
27 */
28struct user_regs_struct {
29 /* GPR R0-R31... */
30 unsigned long gpr[32];
31 unsigned long pc;
32 unsigned long sr;
33 unsigned long pad1;
34 unsigned long pad2;
35};
36#endif
37
38#ifdef __KERNEL__
39
40/*
41 * Make kernel PTrace/register structures opaque to userspace... userspace can
42 * access thread state via the regset mechanism. This allows us a bit of
43 * flexibility in how we order the registers on the stack, permitting some
44 * optimizations like packing call-clobbered registers together so that
45 * they share a cacheline (not done yet, though... future optimization).
46 */
47
48#ifndef __ASSEMBLY__
49/*
50 * This struct describes how the registers are laid out on the kernel stack
51 * during a syscall or other kernel entry.
52 *
53 * This structure should always be cacheline aligned on the stack.
54 * FIXME: I don't think that's the case right now. The alignment is
55 * taken care of elsewhere... head.S, process.c, etc.
56 */
57
58struct pt_regs {
59 union {
60 struct {
61 /* Named registers */
62 long sr; /* Stored in place of r0 */
63 long sp; /* r1 */
64 };
65 struct {
66 /* Old style */
67 long offset[2];
68 long gprs[30];
69 };
70 struct {
71 /* New style */
72 long gpr[32];
73 };
74 };
75 long pc;
76 long orig_gpr11; /* For restarting system calls */
77 long syscallno; /* Syscall number (used by strace) */
78 long dummy; /* Cheap alignment fix */
79};
80#endif /* __ASSEMBLY__ */
81
82/* TODO: Rename this to REDZONE because that's what it is */
83#define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
84
85#define instruction_pointer(regs) ((regs)->pc)
86#define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
87#define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
88#define profile_pc(regs) instruction_pointer(regs)
89
90/*
91 * Offsets used by 'ptrace' system call interface.
92 */
93#define PT_SR 0
94#define PT_SP 4
95#define PT_GPR2 8
96#define PT_GPR3 12
97#define PT_GPR4 16
98#define PT_GPR5 20
99#define PT_GPR6 24
100#define PT_GPR7 28
101#define PT_GPR8 32
102#define PT_GPR9 36
103#define PT_GPR10 40
104#define PT_GPR11 44
105#define PT_GPR12 48
106#define PT_GPR13 52
107#define PT_GPR14 56
108#define PT_GPR15 60
109#define PT_GPR16 64
110#define PT_GPR17 68
111#define PT_GPR18 72
112#define PT_GPR19 76
113#define PT_GPR20 80
114#define PT_GPR21 84
115#define PT_GPR22 88
116#define PT_GPR23 92
117#define PT_GPR24 96
118#define PT_GPR25 100
119#define PT_GPR26 104
120#define PT_GPR27 108
121#define PT_GPR28 112
122#define PT_GPR29 116
123#define PT_GPR30 120
124#define PT_GPR31 124
125#define PT_PC 128
126#define PT_ORIG_GPR11 132
127#define PT_SYSCALLNO 136
128
129#endif /* __KERNEL__ */
130
131#endif /* __ASM_OPENRISC_PTRACE_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * OpenRISC Linux
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
13 */
14#ifndef __ASM_OPENRISC_PTRACE_H
15#define __ASM_OPENRISC_PTRACE_H
16
17
18#include <asm/spr_defs.h>
19#include <uapi/asm/ptrace.h>
20
21/*
22 * Make kernel PTrace/register structures opaque to userspace... userspace can
23 * access thread state via the regset mechanism. This allows us a bit of
24 * flexibility in how we order the registers on the stack, permitting some
25 * optimizations like packing call-clobbered registers together so that
26 * they share a cacheline (not done yet, though... future optimization).
27 */
28
29#ifndef __ASSEMBLY__
30/*
31 * This struct describes how the registers are laid out on the kernel stack
32 * during a syscall or other kernel entry.
33 *
34 * This structure should always be cacheline aligned on the stack.
35 * FIXME: I don't think that's the case right now. The alignment is
36 * taken care of elsewhere... head.S, process.c, etc.
37 */
38
39struct pt_regs {
40 union {
41 struct {
42 /* Named registers */
43 long sr; /* Stored in place of r0 */
44 long sp; /* r1 */
45 };
46 struct {
47 /* Old style */
48 long offset[2];
49 long gprs[30];
50 };
51 struct {
52 /* New style */
53 long gpr[32];
54 };
55 };
56 long pc;
57 /* For restarting system calls:
58 * Set to syscall number for syscall exceptions,
59 * -1 for all other exceptions.
60 */
61 long orig_gpr11; /* For restarting system calls */
62 long dummy; /* Cheap alignment fix */
63 long dummy2; /* Cheap alignment fix */
64};
65
66/* TODO: Rename this to REDZONE because that's what it is */
67#define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
68
69#define instruction_pointer(regs) ((regs)->pc)
70#define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
71#define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
72#define profile_pc(regs) instruction_pointer(regs)
73
74static inline long regs_return_value(struct pt_regs *regs)
75{
76 return regs->gpr[11];
77}
78
79#endif /* __ASSEMBLY__ */
80
81/*
82 * Offsets used by 'ptrace' system call interface.
83 */
84#define PT_SR 0
85#define PT_SP 4
86#define PT_GPR2 8
87#define PT_GPR3 12
88#define PT_GPR4 16
89#define PT_GPR5 20
90#define PT_GPR6 24
91#define PT_GPR7 28
92#define PT_GPR8 32
93#define PT_GPR9 36
94#define PT_GPR10 40
95#define PT_GPR11 44
96#define PT_GPR12 48
97#define PT_GPR13 52
98#define PT_GPR14 56
99#define PT_GPR15 60
100#define PT_GPR16 64
101#define PT_GPR17 68
102#define PT_GPR18 72
103#define PT_GPR19 76
104#define PT_GPR20 80
105#define PT_GPR21 84
106#define PT_GPR22 88
107#define PT_GPR23 92
108#define PT_GPR24 96
109#define PT_GPR25 100
110#define PT_GPR26 104
111#define PT_GPR27 108
112#define PT_GPR28 112
113#define PT_GPR29 116
114#define PT_GPR30 120
115#define PT_GPR31 124
116#define PT_PC 128
117#define PT_ORIG_GPR11 132
118#define PT_SYSCALLNO 136
119
120#endif /* __ASM_OPENRISC_PTRACE_H */