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2 * include/asm-xtensa/ptrace.h
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
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 #ifndef _XTENSA_PTRACE_H
12 #define _XTENSA_PTRACE_H
14 #include <xtensa/config/core.h>
19 * +-----------------------+ -------- STACK_SIZE
21 * +-----------------------+ |
22 * | struct pt_regs | |
23 * +-----------------------+ | ------ PT_REGS_OFFSET
24 * double : 16 bytes spill area : | ^
25 * excetion :- - - - - - - - - - - -: | |
26 * frame : struct pt_regs : | |
27 * :- - - - - - - - - - - -: | |
29 * | memory stack | | |
35 * +-----------------------+ | | --- STACK_BIAS
36 * | struct task_struct | | | ^
37 * current --> +-----------------------+ | | |
38 * | struct thread_info | | | |
39 * +-----------------------+ --------
42 #define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
44 /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
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
56 /* Registers used by strace */
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
73 #define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
75 /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
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
86 * This struct defines the way the registers are stored on the
87 * kernel stack during a system call or other kernel entry.
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 */
106 /* Make sure the areg field is 16 bytes aligned. */
107 int align
[0] __attribute__ ((aligned(16)));
109 /* current register frame.
110 * Note: The ESF for kernel exceptions ends after 16 registers!
112 unsigned long areg
[16]; /* 128 (64) */
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
*);
123 # define profile_pc(regs) instruction_pointer(regs)
125 #endif /* __KERNEL__ */
127 #else /* __ASSEMBLY__ */
130 # include <asm/offsets.h>
131 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
134 #endif /* !__ASSEMBLY__ */
135 #endif /* _XTENSA_PTRACE_H */