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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASMAXP_PTRACE_H
2#define _ASMAXP_PTRACE_H
3
4
5/*
6 * This struct defines the way the registers are stored on the
7 * kernel stack during a system call or other kernel entry
8 *
9 * NOTE! I want to minimize the overhead of system calls, so this
10 * struct has as little information as possible. I does not have
11 *
12 * - floating point regs: the kernel doesn't change those
13 * - r9-15: saved by the C compiler
14 *
15 * This makes "fork()" and "exec()" a bit more complex, but should
16 * give us low system call latency.
17 */
18
19struct pt_regs {
20 unsigned long r0;
21 unsigned long r1;
22 unsigned long r2;
23 unsigned long r3;
24 unsigned long r4;
25 unsigned long r5;
26 unsigned long r6;
27 unsigned long r7;
28 unsigned long r8;
29 unsigned long r19;
30 unsigned long r20;
31 unsigned long r21;
32 unsigned long r22;
33 unsigned long r23;
34 unsigned long r24;
35 unsigned long r25;
36 unsigned long r26;
37 unsigned long r27;
38 unsigned long r28;
39 unsigned long hae;
40/* JRP - These are the values provided to a0-a2 by PALcode */
41 unsigned long trap_a0;
42 unsigned long trap_a1;
43 unsigned long trap_a2;
44/* These are saved by PAL-code: */
45 unsigned long ps;
46 unsigned long pc;
47 unsigned long gp;
48 unsigned long r16;
49 unsigned long r17;
50 unsigned long r18;
51};
52
53/*
54 * This is the extended stack used by signal handlers and the context
55 * switcher: it's pushed after the normal "struct pt_regs".
56 */
57struct switch_stack {
58 unsigned long r9;
59 unsigned long r10;
60 unsigned long r11;
61 unsigned long r12;
62 unsigned long r13;
63 unsigned long r14;
64 unsigned long r15;
65 unsigned long r26;
66 unsigned long fp[32]; /* fp[31] is fpcr */
67};
68
69#ifdef __KERNEL__
Christoph Hellwig481bed42005-11-07 00:59:47 -080070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#define user_mode(regs) (((regs)->ps & 8) != 0)
72#define instruction_pointer(regs) ((regs)->pc)
73#define profile_pc(regs) instruction_pointer(regs)
74extern void show_regs(struct pt_regs *);
75
akpm@osdl.orge52f4ca2006-01-12 01:05:37 -080076#define task_pt_regs(task) \
Al Viro27f45132006-01-12 01:05:36 -080077 ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
akpm@osdl.orge52f4ca2006-01-12 01:05:37 -080079#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81#endif
82
83#endif