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