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
39 struct 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
74 static 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
119 #endif /* __ASM_OPENRISC_PTRACE_H */
120
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