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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 struct pt_regs {
20
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;
46
47         /*
48          * To distinguish bet excp, syscall, irq
49          * For traps and exceptions, Exception Cause Register.
50          *      ECR: <00> <VV> <CC> <PP>
51          *      Last word used by Linux for extra state mgmt (syscall-restart)
52          * For interrupts, use artificial ECR values to note current prio-level
53          */
54         union {
55                 struct {
56 #ifdef CONFIG_CPU_BIG_ENDIAN
57                         unsigned long state:8, ecr_vec:8,
58                                       ecr_cause:8, ecr_param:8;
59 #else
60                         unsigned long ecr_param:8, ecr_cause:8,
61                                       ecr_vec:8, state:8;
62 #endif
63                 };
64                 unsigned long event;
65         };
66
67         long user_r25;
68 };
69
70 /* Callee saved registers - need to be saved only when you are scheduled out */
71
72 struct callee_regs {
73         long r25;
74         long r24;
75         long r23;
76         long r22;
77         long r21;
78         long r20;
79         long r19;
80         long r18;
81         long r17;
82         long r16;
83         long r15;
84         long r14;
85         long r13;
86 };
87
88 #define instruction_pointer(regs)       ((regs)->ret)
89 #define profile_pc(regs)                instruction_pointer(regs)
90
91 /* return 1 if user mode or 0 if kernel mode */
92 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
93
94 #define user_stack_pointer(regs)\
95 ({  unsigned int sp;            \
96         if (user_mode(regs))    \
97                 sp = (regs)->sp;\
98         else                    \
99                 sp = -1;        \
100         sp;                     \
101 })
102
103 /* return 1 if PC in delay slot */
104 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
105
106 #define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
107 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
108
109 #define STATE_SCALL_RESTARTED   0x01
110
111 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
112 #define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
113
114 #define current_pt_regs()                                       \
115 ({                                                              \
116         /* open-coded current_thread_info() */                  \
117         register unsigned long sp asm ("sp");                   \
118         unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
119         (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
120 })
121
122 static inline long regs_return_value(struct pt_regs *regs)
123 {
124         return regs->r0;
125 }
126
127 #endif /* !__ASSEMBLY__ */
128
129 #endif /* __ASM_PTRACE_H */