1 #ifndef _ASMAXP_PTRACE_H
2 #define _ASMAXP_PTRACE_H
6 * This struct defines the way the registers are stored on the
7 * kernel stack during a system call or other kernel entry
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
12 * - floating point regs: the kernel doesn't change those
13 * - r9-15: saved by the C compiler
15 * This makes "fork()" and "exec()" a bit more complex, but should
16 * give us low system call latency.
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: */
54 * This is the extended stack used by signal handlers and the context
55 * switcher: it's pushed after the normal "struct pt_regs".
66 unsigned long fp[32]; /* fp[31] is fpcr */
71 #define __ARCH_SYS_PTRACE 1
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 *);
78 #define task_pt_regs(task) \
79 ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
81 #define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)