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1 | /* |
2 | * include/asm-xtensa/ptrace.h | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_PTRACE_H | |
12 | #define _XTENSA_PTRACE_H | |
13 | ||
14 | #include <xtensa/config/core.h> | |
15 | ||
16 | /* | |
17 | * Kernel stack | |
18 | * | |
19 | * +-----------------------+ -------- STACK_SIZE | |
20 | * | register file | | | |
21 | * +-----------------------+ | | |
22 | * | struct pt_regs | | | |
23 | * +-----------------------+ | ------ PT_REGS_OFFSET | |
24 | * double : 16 bytes spill area : | ^ | |
25 | * excetion :- - - - - - - - - - - -: | | | |
26 | * frame : struct pt_regs : | | | |
27 | * :- - - - - - - - - - - -: | | | |
28 | * | | | | | |
29 | * | memory stack | | | | |
30 | * | | | | | |
31 | * ~ ~ ~ ~ | |
32 | * ~ ~ ~ ~ | |
33 | * | | | | | |
34 | * | | | | | |
35 | * +-----------------------+ | | --- STACK_BIAS | |
36 | * | struct task_struct | | | ^ | |
37 | * current --> +-----------------------+ | | | | |
38 | * | struct thread_info | | | | | |
39 | * +-----------------------+ -------- | |
40 | */ | |
41 | ||
42 | #define KERNEL_STACK_SIZE (2 * PAGE_SIZE) | |
43 | ||
44 | /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */ | |
45 | ||
46 | #define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ | |
47 | #define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ | |
48 | #define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ | |
49 | #define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ | |
50 | #define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ | |
51 | #define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ | |
52 | #define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ | |
53 | #define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ | |
54 | #define EXC_TABLE_SIZE 0x400 | |
55 | ||
56 | /* Registers used by strace */ | |
57 | ||
58 | #define REG_A_BASE 0xfc000000 | |
59 | #define REG_AR_BASE 0x04000000 | |
60 | #define REG_PC 0x14000000 | |
61 | #define REG_PS 0x080000e6 | |
62 | #define REG_WB 0x08000048 | |
63 | #define REG_WS 0x08000049 | |
64 | #define REG_LBEG 0x08000000 | |
65 | #define REG_LEND 0x08000001 | |
66 | #define REG_LCOUNT 0x08000002 | |
67 | #define REG_SAR 0x08000003 | |
68 | #define REG_DEPC 0x080000c0 | |
69 | #define REG_EXCCAUSE 0x080000e8 | |
70 | #define REG_EXCVADDR 0x080000ee | |
71 | #define SYSCALL_NR 0x1 | |
72 | ||
73 | #define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1) | |
74 | ||
75 | /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ | |
76 | ||
77 | #define PTRACE_GETREGS 12 | |
78 | #define PTRACE_SETREGS 13 | |
79 | #define PTRACE_GETFPREGS 14 | |
80 | #define PTRACE_SETFPREGS 15 | |
81 | #define PTRACE_GETFPREGSIZE 18 | |
82 | ||
83 | #ifndef __ASSEMBLY__ | |
84 | ||
85 | /* | |
86 | * This struct defines the way the registers are stored on the | |
87 | * kernel stack during a system call or other kernel entry. | |
88 | */ | |
89 | struct pt_regs { | |
90 | unsigned long pc; /* 4 */ | |
91 | unsigned long ps; /* 8 */ | |
92 | unsigned long depc; /* 12 */ | |
93 | unsigned long exccause; /* 16 */ | |
94 | unsigned long excvaddr; /* 20 */ | |
95 | unsigned long debugcause; /* 24 */ | |
96 | unsigned long wmask; /* 28 */ | |
97 | unsigned long lbeg; /* 32 */ | |
98 | unsigned long lend; /* 36 */ | |
99 | unsigned long lcount; /* 40 */ | |
100 | unsigned long sar; /* 44 */ | |
101 | unsigned long windowbase; /* 48 */ | |
102 | unsigned long windowstart; /* 52 */ | |
103 | unsigned long syscall; /* 56 */ | |
104 | int reserved[2]; /* 64 */ | |
105 | ||
106 | /* Make sure the areg field is 16 bytes aligned. */ | |
107 | int align[0] __attribute__ ((aligned(16))); | |
108 | ||
109 | /* current register frame. | |
110 | * Note: The ESF for kernel exceptions ends after 16 registers! | |
111 | */ | |
112 | unsigned long areg[16]; /* 128 (64) */ | |
113 | }; | |
114 | ||
115 | #ifdef __KERNEL__ | |
116 | # define xtensa_pt_regs(tsk) ((struct pt_regs*) \ | |
117 | (((long)(tsk)->thread_info + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4)) - 1) | |
118 | # define user_mode(regs) (((regs)->ps & 0x00000020)!=0) | |
119 | # define instruction_pointer(regs) ((regs)->pc) | |
120 | extern void show_regs(struct pt_regs *); | |
121 | ||
122 | # ifndef CONFIG_SMP | |
123 | # define profile_pc(regs) instruction_pointer(regs) | |
124 | # endif | |
125 | #endif /* __KERNEL__ */ | |
126 | ||
127 | #else /* __ASSEMBLY__ */ | |
128 | ||
129 | #ifdef __KERNEL__ | |
130 | # include <asm/offsets.h> | |
131 | #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) | |
132 | #endif | |
133 | ||
134 | #endif /* !__ASSEMBLY__ */ | |
135 | #endif /* _XTENSA_PTRACE_H */ |