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 * 1 word gutter after reg-file has been saved
22 * Technically not needed, Since SP always points to a "full" location
23 * (vs. "empty"). But pt_regs is shared with tools....
24 */
25 long res;
26
27 /* Real registers */
28 long bta; /* bta_l1, bta_l2, erbta */
29 long lp_start;
30 long lp_end;
31 long lp_count;
32 long status32; /* status32_l1, status32_l2, erstatus */
33 long ret; /* ilink1, ilink2 or eret */
34 long blink;
35 long fp;
36 long r26; /* gp */
37 long r12;
38 long r11;
39 long r10;
40 long r9;
41 long r8;
42 long r7;
43 long r6;
44 long r5;
45 long r4;
46 long r3;
47 long r2;
48 long r1;
49 long r0;
50 long sp; /* user/kernel sp depending on where we came from */
51 long orig_r0;
52
53 /*to distinguish bet excp, syscall, irq */
54 union {
55 #ifdef CONFIG_CPU_BIG_ENDIAN
56 /* so that assembly code is same for LE/BE */
57 unsigned long orig_r8:16, event:16;
58 #else
59 unsigned long event:16, orig_r8:16;
60 #endif
61 long orig_r8_word;
62 };
63 };
64
65 /* Callee saved registers - need to be saved only when you are scheduled out */
66
67 struct callee_regs {
68 long res; /* Again this is not needed */
69 long r25;
70 long r24;
71 long r23;
72 long r22;
73 long r21;
74 long r20;
75 long r19;
76 long r18;
77 long r17;
78 long r16;
79 long r15;
80 long r14;
81 long r13;
82 };
83
84 #define instruction_pointer(regs) ((regs)->ret)
85 #define profile_pc(regs) instruction_pointer(regs)
86
87 /* return 1 if user mode or 0 if kernel mode */
88 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
89
90 #define user_stack_pointer(regs)\
91 ({ unsigned int sp; \
92 if (user_mode(regs)) \
93 sp = (regs)->sp;\
94 else \
95 sp = -1; \
96 sp; \
97 })
98
99 /* return 1 if PC in delay slot */
100 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
101
102 #define in_syscall(regs) (regs->event & orig_r8_IS_SCALL)
103 #define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT)
104
105 #define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED)
106 #define syscall_restartable(regs) !(regs->event & orig_r8_IS_SCALL_RESTARTED)
107
108 #define current_pt_regs() \
109 ({ \
110 /* open-coded current_thread_info() */ \
111 register unsigned long sp asm ("sp"); \
112 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
113 (struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1; \
114 })
115
regs_return_value(struct pt_regs * regs)116 static inline long regs_return_value(struct pt_regs *regs)
117 {
118 return regs->r0;
119 }
120
121 #endif /* !__ASSEMBLY__ */
122
123 #define orig_r8_IS_SCALL 0x0001
124 #define orig_r8_IS_SCALL_RESTARTED 0x0002
125 #define orig_r8_IS_BRKPT 0x0004
126 #define orig_r8_IS_EXCPN 0x0008
127 #define orig_r8_IS_IRQ1 0x0010
128 #define orig_r8_IS_IRQ2 0x0020
129
130 #endif /* __ASM_PTRACE_H */
131