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wdenkb15cbc02000-08-21 15:05:47 +00001#ifndef _PPC_PTRACE_H
2#define _PPC_PTRACE_H
3
4/*
5 * This struct defines the way the registers are stored on the
6 * kernel stack during a system call or other kernel entry.
7 *
8 * this should only contain volatile regs
9 * since we can keep non-volatile in the thread_struct
10 * should set this up when only volatiles are saved
11 * by intr code.
12 *
13 * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
14 * that the overall structure is a multiple of 16 bytes in length.
15 *
16 * Note that the offsets of the fields in this struct correspond with
17 * the PT_* values below. This simplifies arch/ppc/kernel/ptrace.c.
18 */
19
20#include <linux/config.h>
21
22#ifndef __ASSEMBLY__
23#ifdef CONFIG_PPC64BRIDGE
24#define PPC_REG unsigned long /*long*/
25#else
26#define PPC_REG unsigned long
27#endif
28struct pt_regs {
29 PPC_REG gpr[32];
30 PPC_REG nip;
31 PPC_REG msr;
32 PPC_REG orig_gpr3; /* Used for restarting system calls */
33 PPC_REG ctr;
34 PPC_REG link;
35 PPC_REG xer;
36 PPC_REG ccr;
37 PPC_REG mq; /* 601 only (not used at present) */
38 /* Used on APUS to hold IPL value. */
39 PPC_REG trap; /* Reason for being here */
40 PPC_REG dar; /* Fault registers */
41 PPC_REG dsisr;
42 PPC_REG result; /* Result of a system call */
43};
44#endif
45
46#define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
47
48/* Size of stack frame allocated when calling signal handler. */
49#define __SIGNAL_FRAMESIZE 64
50
51#define instruction_pointer(regs) ((regs)->nip)
52#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
53
54/*
55 * Offsets used by 'ptrace' system call interface.
56 * These can't be changed without breaking binary compatibility
57 * with MkLinux, etc.
58 */
59#define PT_R0 0
60#define PT_R1 1
61#define PT_R2 2
62#define PT_R3 3
63#define PT_R4 4
64#define PT_R5 5
65#define PT_R6 6
66#define PT_R7 7
67#define PT_R8 8
68#define PT_R9 9
69#define PT_R10 10
70#define PT_R11 11
71#define PT_R12 12
72#define PT_R13 13
73#define PT_R14 14
74#define PT_R15 15
75#define PT_R16 16
76#define PT_R17 17
77#define PT_R18 18
78#define PT_R19 19
79#define PT_R20 20
80#define PT_R21 21
81#define PT_R22 22
82#define PT_R23 23
83#define PT_R24 24
84#define PT_R25 25
85#define PT_R26 26
86#define PT_R27 27
87#define PT_R28 28
88#define PT_R29 29
89#define PT_R30 30
90#define PT_R31 31
91
92#define PT_NIP 32
93#define PT_MSR 33
94#ifdef __KERNEL__
95#define PT_ORIG_R3 34
96#endif
97#define PT_CTR 35
98#define PT_LNK 36
99#define PT_XER 37
100#define PT_CCR 38
101#define PT_MQ 39
102
103#define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */
104#define PT_FPR31 (PT_FPR0 + 2*31)
105#define PT_FPSCR (PT_FPR0 + 2*32 + 1)
106
107#endif