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1da177e4 LT |
1 | #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 | ||
19 | struct 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 | */ | |
57 | struct 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__ | |
70 | #define user_mode(regs) (((regs)->ps & 8) != 0) | |
71 | #define instruction_pointer(regs) ((regs)->pc) | |
72 | #define profile_pc(regs) instruction_pointer(regs) | |
73 | extern void show_regs(struct pt_regs *); | |
74 | ||
75 | #define alpha_task_regs(task) \ | |
76 | ((struct pt_regs *) ((long) (task)->thread_info + 2*PAGE_SIZE) - 1) | |
77 | ||
78 | #define force_successful_syscall_return() (alpha_task_regs(current)->r0 = 0) | |
79 | ||
80 | #endif | |
81 | ||
82 | #endif |