| #ifndef _ASMAXP_PTRACE_H |
| #define _ASMAXP_PTRACE_H |
| |
| |
| /* |
| * This struct defines the way the registers are stored on the |
| * kernel stack during a system call or other kernel entry |
| * |
| * NOTE! I want to minimize the overhead of system calls, so this |
| * struct has as little information as possible. I does not have |
| * |
| * - floating point regs: the kernel doesn't change those |
| * - r9-15: saved by the C compiler |
| * |
| * This makes "fork()" and "exec()" a bit more complex, but should |
| * give us low system call latency. |
| */ |
| |
| struct pt_regs { |
| unsigned long r0; |
| unsigned long r1; |
| unsigned long r2; |
| unsigned long r3; |
| unsigned long r4; |
| unsigned long r5; |
| unsigned long r6; |
| unsigned long r7; |
| unsigned long r8; |
| unsigned long r19; |
| unsigned long r20; |
| unsigned long r21; |
| unsigned long r22; |
| unsigned long r23; |
| unsigned long r24; |
| unsigned long r25; |
| unsigned long r26; |
| unsigned long r27; |
| unsigned long r28; |
| unsigned long hae; |
| /* JRP - These are the values provided to a0-a2 by PALcode */ |
| unsigned long trap_a0; |
| unsigned long trap_a1; |
| unsigned long trap_a2; |
| /* These are saved by PAL-code: */ |
| unsigned long ps; |
| unsigned long pc; |
| unsigned long gp; |
| unsigned long r16; |
| unsigned long r17; |
| unsigned long r18; |
| }; |
| |
| /* |
| * This is the extended stack used by signal handlers and the context |
| * switcher: it's pushed after the normal "struct pt_regs". |
| */ |
| struct switch_stack { |
| unsigned long r9; |
| unsigned long r10; |
| unsigned long r11; |
| unsigned long r12; |
| unsigned long r13; |
| unsigned long r14; |
| unsigned long r15; |
| unsigned long r26; |
| unsigned long fp[32]; /* fp[31] is fpcr */ |
| }; |
| |
| #ifdef __KERNEL__ |
| |
| #define arch_has_single_step() (1) |
| #define user_mode(regs) (((regs)->ps & 8) != 0) |
| #define instruction_pointer(regs) ((regs)->pc) |
| #define profile_pc(regs) instruction_pointer(regs) |
| |
| #define task_pt_regs(task) \ |
| ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1) |
| |
| #define current_pt_regs() \ |
| ((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1) |
| |
| #define force_successful_syscall_return() (current_pt_regs()->r0 = 0) |
| |
| #endif |
| |
| #endif |
