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, r30;
88
89#ifdef CONFIG_ARC_HAS_ACCL_REGS
90 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
91#endif
92
93 /*------- Below list auto saved by h/w -----------*/
94 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
95
96 unsigned long blink;
97 unsigned long lp_end, lp_start, lp_count;
98
99 unsigned long ei, ldi, jli;
100
101 unsigned long ret;
102 unsigned long status32;
103};
104
105#endif
106
107/* Callee saved registers - need to be saved only when you are scheduled out */
108
109struct callee_regs {
110 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
111};
112
113#define instruction_pointer(regs) ((regs)->ret)
114#define profile_pc(regs) instruction_pointer(regs)
115
116/* return 1 if user mode or 0 if kernel mode */
117#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
118
119#define user_stack_pointer(regs)\
120({ unsigned int sp; \
121 if (user_mode(regs)) \
122 sp = (regs)->sp;\
123 else \
124 sp = -1; \
125 sp; \
126})
127
128/* return 1 if PC in delay slot */
129#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
130
131#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
132#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
133
134#define STATE_SCALL_RESTARTED 0x01
135
136#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
137#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
138
139#define current_pt_regs() \
140({ \
141 /* open-coded current_thread_info() */ \
142 register unsigned long sp asm ("sp"); \
143 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
144 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
145})
146
147static inline long regs_return_value(struct pt_regs *regs)
148{
149 return (long)regs->r0;
150}
151
152#endif /* !__ASSEMBLY__ */
153
154#endif /* __ASM_PTRACE_H */