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
20 struct pt_regs {
21
22 #ifdef CONFIG_ARC_PLAT_EZNPS
23 unsigned long eflags; /* Extended FLAGS */
24 unsigned long gpa1; /* General Purpose Aux */
25 #endif
26
27 /* Real registers */
28 unsigned long bta; /* bta_l1, bta_l2, erbta */
29
30 unsigned long lp_start, lp_end, lp_count;
31
32 unsigned long status32; /* status32_l1, status32_l2, erstatus */
33 unsigned long ret; /* ilink1, ilink2 or eret */
34 unsigned long blink;
35 unsigned long fp;
36 unsigned long r26; /* gp */
37
38 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
39
40 unsigned long sp; /* User/Kernel depending on where we came from */
41 unsigned long orig_r0;
42
43 /*
44 * To distinguish bet excp, syscall, irq
45 * For traps and exceptions, Exception Cause Register.
46 * ECR: <00> <VV> <CC> <PP>
47 * Last word used by Linux for extra state mgmt (syscall-restart)
48 * For interrupts, use artificial ECR values to note current prio-level
49 */
50 union {
51 struct {
52 #ifdef CONFIG_CPU_BIG_ENDIAN
53 unsigned long state:8, ecr_vec:8,
54 ecr_cause:8, ecr_param:8;
55 #else
56 unsigned long ecr_param:8, ecr_cause:8,
57 ecr_vec:8, state:8;
58 #endif
59 };
60 unsigned long event;
61 };
62
63 unsigned long user_r25;
64 };
65 #else
66
67 struct pt_regs {
68
69 unsigned long orig_r0;
70
71 union {
72 struct {
73 #ifdef CONFIG_CPU_BIG_ENDIAN
74 unsigned long state:8, ecr_vec:8,
75 ecr_cause:8, ecr_param:8;
76 #else
77 unsigned long ecr_param:8, ecr_cause:8,
78 ecr_vec:8, state:8;
79 #endif
80 };
81 unsigned long event;
82 };
83
84 unsigned long bta; /* bta_l1, bta_l2, erbta */
85
86 unsigned long user_r25;
87
88 unsigned long r26; /* gp */
89 unsigned long fp;
90 unsigned long sp; /* user/kernel sp depending on where we came from */
91
92 unsigned long r12, r30;
93
94 #ifdef CONFIG_ARC_HAS_ACCL_REGS
95 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
96 #endif
97
98 /*------- Below list auto saved by h/w -----------*/
99 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
100
101 unsigned long blink;
102 unsigned long lp_end, lp_start, lp_count;
103
104 unsigned long ei, ldi, jli;
105
106 unsigned long ret;
107 unsigned long status32;
108 };
109
110 #endif
111
112 /* Callee saved registers - need to be saved only when you are scheduled out */
113
114 struct callee_regs {
115 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
116 };
117
118 #define instruction_pointer(regs) ((regs)->ret)
119 #define profile_pc(regs) instruction_pointer(regs)
120
121 /* return 1 if user mode or 0 if kernel mode */
122 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
123
124 #define user_stack_pointer(regs)\
125 ({ unsigned int sp; \
126 if (user_mode(regs)) \
127 sp = (regs)->sp;\
128 else \
129 sp = -1; \
130 sp; \
131 })
132
133 /* return 1 if PC in delay slot */
134 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
135
136 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
137 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
138
139 #define STATE_SCALL_RESTARTED 0x01
140
141 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
142 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
143
144 #define current_pt_regs() \
145 ({ \
146 /* open-coded current_thread_info() */ \
147 register unsigned long sp asm ("sp"); \
148 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
149 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
150 })
151
regs_return_value(struct pt_regs * regs)152 static inline long regs_return_value(struct pt_regs *regs)
153 {
154 return (long)regs->r0;
155 }
156
157 #endif /* !__ASSEMBLY__ */
158
159 #endif /* __ASM_PTRACE_H */
160
