1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
6 */
7 #ifndef __ASM_ARC_PTRACE_H
8 #define __ASM_ARC_PTRACE_H
9
10 #include <uapi/asm/ptrace.h>
11
12 #ifndef __ASSEMBLY__
13
14 /* THE pt_regs: Defines how regs are saved during entry into kernel */
15
16 #ifdef CONFIG_ISA_ARCOMPACT
17 struct pt_regs {
18
19 /* Real registers */
20 unsigned long bta; /* bta_l1, bta_l2, erbta */
21
22 unsigned long lp_start, lp_end, lp_count;
23
24 unsigned long status32; /* status32_l1, status32_l2, erstatus */
25 unsigned long ret; /* ilink1, ilink2 or eret */
26 unsigned long blink;
27 unsigned long fp;
28 unsigned long r26; /* gp */
29
30 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
31
32 unsigned long sp; /* User/Kernel depending on where we came from */
33 unsigned long orig_r0;
34
35 /*
36 * To distinguish bet excp, syscall, irq
37 * For traps and exceptions, Exception Cause Register.
38 * ECR: <00> <VV> <CC> <PP>
39 * Last word used by Linux for extra state mgmt (syscall-restart)
40 * For interrupts, use artificial ECR values to note current prio-level
41 */
42 union {
43 struct {
44 #ifdef CONFIG_CPU_BIG_ENDIAN
45 unsigned long state:8, ecr_vec:8,
46 ecr_cause:8, ecr_param:8;
47 #else
48 unsigned long ecr_param:8, ecr_cause:8,
49 ecr_vec:8, state:8;
50 #endif
51 };
52 unsigned long event;
53 };
54
55 unsigned long user_r25;
56 };
57 #else
58
59 struct pt_regs {
60
61 unsigned long orig_r0;
62
63 union {
64 struct {
65 #ifdef CONFIG_CPU_BIG_ENDIAN
66 unsigned long state:8, ecr_vec:8,
67 ecr_cause:8, ecr_param:8;
68 #else
69 unsigned long ecr_param:8, ecr_cause:8,
70 ecr_vec:8, state:8;
71 #endif
72 };
73 unsigned long event;
74 };
75
76 unsigned long bta; /* bta_l1, bta_l2, erbta */
77
78 unsigned long user_r25;
79
80 unsigned long r26; /* gp */
81 unsigned long fp;
82 unsigned long sp; /* user/kernel sp depending on where we came from */
83
84 unsigned long r12, r30;
85
86 #ifdef CONFIG_ARC_HAS_ACCL_REGS
87 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
88 #endif
89 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
90 unsigned long DSP_CTRL;
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
109 struct 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
regs_return_value(struct pt_regs * regs)147 static 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 */
155
