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
19struct pt_regs {
20
21 /* Real registers */
22 long bta; /* bta_l1, bta_l2, erbta */
23
24 long lp_start, lp_end, lp_count;
25
26 long status32; /* status32_l1, status32_l2, erstatus */
27 long ret; /* ilink1, ilink2 or eret */
28 long blink;
29 long fp;
30 long r26; /* gp */
31
32 long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
33
34 long sp; /* user/kernel sp depending on where we came from */
35 long orig_r0;
36
37 /*
38 * To distinguish bet excp, syscall, irq
39 * For traps and exceptions, Exception Cause Register.
40 * ECR: <00> <VV> <CC> <PP>
41 * Last word used by Linux for extra state mgmt (syscall-restart)
42 * For interrupts, use artificial ECR values to note current prio-level
43 */
44 union {
45 struct {
46#ifdef CONFIG_CPU_BIG_ENDIAN
47 unsigned long state:8, ecr_vec:8,
48 ecr_cause:8, ecr_param:8;
49#else
50 unsigned long ecr_param:8, ecr_cause:8,
51 ecr_vec:8, state:8;
52#endif
53 };
54 unsigned long event;
55 };
56
57 long user_r25;
58};
59
60/* Callee saved registers - need to be saved only when you are scheduled out */
61
62struct callee_regs {
63 long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
64};
65
66#define instruction_pointer(regs) ((regs)->ret)
67#define profile_pc(regs) instruction_pointer(regs)
68
69/* return 1 if user mode or 0 if kernel mode */
70#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
71
72#define user_stack_pointer(regs)\
73({ unsigned int sp; \
74 if (user_mode(regs)) \
75 sp = (regs)->sp;\
76 else \
77 sp = -1; \
78 sp; \
79})
80
81/* return 1 if PC in delay slot */
82#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
83
84#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
85#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
86
87#define STATE_SCALL_RESTARTED 0x01
88
89#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
90#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
91
92#define current_pt_regs() \
93({ \
94 /* open-coded current_thread_info() */ \
95 register unsigned long sp asm ("sp"); \
96 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
97 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
98})
99
100static inline long regs_return_value(struct pt_regs *regs)
101{
102 return regs->r0;
103}
104
105#endif /* !__ASSEMBLY__ */
106
107#endif /* __ASM_PTRACE_H */