tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
9 */
10#ifndef __ASM_ARC_PTRACE_H
11#define __ASM_ARC_PTRACE_H
12
13#include <uapi/asm/ptrace.h>
14
15#ifndef __ASSEMBLY__
16
17/* THE pt_regs: Defines how regs are saved during entry into kernel */
18
19#ifdef CONFIG_ISA_ARCOMPACT
20struct pt_regs {
21
22 /* Real registers */
23 unsigned long bta; /* bta_l1, bta_l2, erbta */
24
25 unsigned long lp_start, lp_end, lp_count;
26
27 unsigned long status32; /* status32_l1, status32_l2, erstatus */
28 unsigned long ret; /* ilink1, ilink2 or eret */
29 unsigned long blink;
30 unsigned long fp;
31 unsigned long r26; /* gp */
32
33 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
34
35 unsigned long sp; /* User/Kernel depending on where we came from */
36 unsigned long orig_r0;
37
38 /*
39 * To distinguish bet excp, syscall, irq
40 * For traps and exceptions, Exception Cause Register.
41 * ECR: <00> <VV> <CC> <PP>
42 * Last word used by Linux for extra state mgmt (syscall-restart)
43 * For interrupts, use artificial ECR values to note current prio-level
44 */
45 union {
46 struct {
47#ifdef CONFIG_CPU_BIG_ENDIAN
48 unsigned long state:8, ecr_vec:8,
49 ecr_cause:8, ecr_param:8;
50#else
51 unsigned long ecr_param:8, ecr_cause:8,
52 ecr_vec:8, state:8;
53#endif
54 };
55 unsigned long event;
56 };
57
58 unsigned long user_r25;
59};
60#else
61
62struct pt_regs {
63
64 unsigned long orig_r0;
65
66 union {
67 struct {
68#ifdef CONFIG_CPU_BIG_ENDIAN
69 unsigned long state:8, ecr_vec:8,
70 ecr_cause:8, ecr_param:8;
71#else
72 unsigned long ecr_param:8, ecr_cause:8,
73 ecr_vec:8, state:8;
74#endif
75 };
76 unsigned long event;
77 };
78
79 unsigned long bta; /* bta_l1, bta_l2, erbta */
80
81 unsigned long user_r25;
82
83 unsigned long r26; /* gp */
84 unsigned long fp;
85 unsigned long sp; /* user/kernel sp depending on where we came from */
86
87 unsigned long r12;
88
89 /*------- Below list auto saved by h/w -----------*/
90 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
91
92 unsigned long blink;
93 unsigned long lp_end, lp_start, lp_count;
94
95 unsigned long ei, ldi, jli;
96
97 unsigned long ret;
98 unsigned long status32;
99};
100
101#endif
102
103/* Callee saved registers - need to be saved only when you are scheduled out */
104
105struct callee_regs {
106 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
107};
108
109#define instruction_pointer(regs) ((regs)->ret)
110#define profile_pc(regs) instruction_pointer(regs)
111
112/* return 1 if user mode or 0 if kernel mode */
113#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
114
115#define user_stack_pointer(regs)\
116({ unsigned int sp; \
117 if (user_mode(regs)) \
118 sp = (regs)->sp;\
119 else \
120 sp = -1; \
121 sp; \
122})
123
124/* return 1 if PC in delay slot */
125#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
126
127#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
128#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
129
130#define STATE_SCALL_RESTARTED 0x01
131
132#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
133#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
134
135#define current_pt_regs() \
136({ \
137 /* open-coded current_thread_info() */ \
138 register unsigned long sp asm ("sp"); \
139 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
140 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
141})
142
143static inline long regs_return_value(struct pt_regs *regs)
144{
145 return (long)regs->r0;
146}
147
148#endif /* !__ASSEMBLY__ */
149
150#endif /* __ASM_PTRACE_H */