| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ |
| Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 70 | |
| 71 | #define __ARCH_SYS_PTRACE 1 |
| 72 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #define user_mode(regs) (((regs)->ps & 8) != 0) |
| 74 | #define instruction_pointer(regs) ((regs)->pc) |
| 75 | #define profile_pc(regs) instruction_pointer(regs) |
| 76 | extern void show_regs(struct pt_regs *); |
| 77 | |
| 78 | #define alpha_task_regs(task) \ |
| 79 | ((struct pt_regs *) ((long) (task)->thread_info + 2*PAGE_SIZE) - 1) |
| 80 | |
| 81 | #define force_successful_syscall_return() (alpha_task_regs(current)->r0 = 0) |
| 82 | |
| 83 | #endif |
| 84 | |
| 85 | #endif |