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ptrace.h

#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.
 */

00019 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".
 */
00057 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)
extern void show_regs(struct pt_regs *);

#define task_pt_regs(task) \
  ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)

#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)

#endif

#endif

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