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