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Vineet Gupta3be80aa2013-01-18 15:12:17 +05301/*
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 */
Vineet Gupta3be80aa2013-01-18 15:12:17 +053010#ifndef __ASM_ARC_PTRACE_H
11#define __ASM_ARC_PTRACE_H
12
Vineet Gupta8c2f4a82013-02-11 19:55:33 +053013#include <uapi/asm/ptrace.h>
Vineet Gupta3be80aa2013-01-18 15:12:17 +053014
15#ifndef __ASSEMBLY__
16
17/* THE pt_regs: Defines how regs are saved during entry into kernel */
18
19struct pt_regs {
Vineet Gupta3be80aa2013-01-18 15:12:17 +053020
21 /* Real registers */
22 long bta; /* bta_l1, bta_l2, erbta */
23 long lp_start;
24 long lp_end;
25 long lp_count;
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 long r12;
32 long r11;
33 long r10;
34 long r9;
35 long r8;
36 long r7;
37 long r6;
38 long r5;
39 long r4;
40 long r3;
41 long r2;
42 long r1;
43 long r0;
44 long sp; /* user/kernel sp depending on where we came from */
45 long orig_r0;
Vineet Gupta5c39c0a2013-02-11 20:01:24 +053046
47 /*to distinguish bet excp, syscall, irq */
48 union {
49#ifdef CONFIG_CPU_BIG_ENDIAN
50 /* so that assembly code is same for LE/BE */
51 unsigned long orig_r8:16, event:16;
52#else
53 unsigned long event:16, orig_r8:16;
54#endif
55 long orig_r8_word;
56 };
Vineet Gupta359105b2013-05-28 13:50:41 +053057
58 long user_r25;
Vineet Gupta3be80aa2013-01-18 15:12:17 +053059};
60
61/* Callee saved registers - need to be saved only when you are scheduled out */
62
63struct callee_regs {
Vineet Gupta3be80aa2013-01-18 15:12:17 +053064 long r25;
65 long r24;
66 long r23;
67 long r22;
68 long r21;
69 long r20;
70 long r19;
71 long r18;
72 long r17;
73 long r16;
74 long r15;
75 long r14;
76 long r13;
77};
78
79#define instruction_pointer(regs) ((regs)->ret)
80#define profile_pc(regs) instruction_pointer(regs)
81
82/* return 1 if user mode or 0 if kernel mode */
83#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
84
85#define user_stack_pointer(regs)\
86({ unsigned int sp; \
87 if (user_mode(regs)) \
88 sp = (regs)->sp;\
89 else \
90 sp = -1; \
91 sp; \
92})
Vineet Gupta4adeefe2013-01-18 15:12:18 +053093
Vineet Gupta2e651ea2013-01-23 16:30:36 +053094/* return 1 if PC in delay slot */
95#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
96
Vineet Gupta5c39c0a2013-02-11 20:01:24 +053097#define in_syscall(regs) (regs->event & orig_r8_IS_SCALL)
98#define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT)
Vineet Gupta4adeefe2013-01-18 15:12:18 +053099
Vineet Gupta55bb9482013-01-18 15:12:19 +0530100#define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED)
101#define syscall_restartable(regs) !(regs->event & orig_r8_IS_SCALL_RESTARTED)
102
Vineet Guptabf90e1e2013-01-18 15:12:18 +0530103#define current_pt_regs() \
104({ \
105 /* open-coded current_thread_info() */ \
106 register unsigned long sp asm ("sp"); \
107 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
Vineet Gupta283237a2013-05-28 09:34:45 +0530108 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
Vineet Guptabf90e1e2013-01-18 15:12:18 +0530109})
110
Vineet Gupta4d86dfb2013-01-22 17:03:59 +0530111static inline long regs_return_value(struct pt_regs *regs)
112{
113 return regs->r0;
114}
115
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530116#endif /* !__ASSEMBLY__ */
117
Vineet Gupta5c39c0a2013-02-11 20:01:24 +0530118#define orig_r8_IS_SCALL 0x0001
119#define orig_r8_IS_SCALL_RESTARTED 0x0002
120#define orig_r8_IS_BRKPT 0x0004
Vineet Gupta367f3fc2013-03-20 16:53:14 +0530121#define orig_r8_IS_EXCPN 0x0008
Vineet Gupta5c39c0a2013-02-11 20:01:24 +0530122#define orig_r8_IS_IRQ1 0x0010
123#define orig_r8_IS_IRQ2 0x0020
124
Vineet Gupta3be80aa2013-01-18 15:12:17 +0530125#endif /* __ASM_PTRACE_H */