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22062a9630
Always equal to task_pt_regs(current); defined only when we are in signal delivery. It may be different from current_pt_regs() - e.g. architectures like m68k may have pt_regs location on exception different from that on a syscall and signals (just as ptrace handling) may happen on exceptions as well as on syscalls. When they are equal, it's often better to have signal_pt_regs defined (in asm/ptrace.h) as current_pt_regs - that tends to be optimized better than default would be. However, optimisation is the only reason why we might want an arch-specific definition; if current_pt_regs() and task_pt_regs(current) have different values, the latter one is right. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
#ifndef _ASMAXP_PTRACE_H
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#define _ASMAXP_PTRACE_H
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/*
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* This struct defines the way the registers are stored on the
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* kernel stack during a system call or other kernel entry
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*
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* NOTE! I want to minimize the overhead of system calls, so this
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* struct has as little information as possible. I does not have
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*
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* - floating point regs: the kernel doesn't change those
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* - r9-15: saved by the C compiler
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*
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* This makes "fork()" and "exec()" a bit more complex, but should
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* give us low system call latency.
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*/
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struct pt_regs {
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unsigned long r0;
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unsigned long r1;
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unsigned long r2;
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unsigned long r3;
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unsigned long r4;
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unsigned long r5;
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unsigned long r6;
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unsigned long r7;
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unsigned long r8;
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unsigned long r19;
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unsigned long r20;
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unsigned long r21;
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unsigned long r22;
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unsigned long r23;
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unsigned long r24;
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unsigned long r25;
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unsigned long r26;
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unsigned long r27;
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unsigned long r28;
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unsigned long hae;
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/* JRP - These are the values provided to a0-a2 by PALcode */
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unsigned long trap_a0;
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unsigned long trap_a1;
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unsigned long trap_a2;
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/* These are saved by PAL-code: */
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unsigned long ps;
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unsigned long pc;
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unsigned long gp;
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unsigned long r16;
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unsigned long r17;
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unsigned long r18;
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};
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/*
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* This is the extended stack used by signal handlers and the context
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* switcher: it's pushed after the normal "struct pt_regs".
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*/
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struct switch_stack {
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long r26;
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unsigned long fp[32]; /* fp[31] is fpcr */
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};
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#ifdef __KERNEL__
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#define arch_has_single_step() (1)
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#define user_mode(regs) (((regs)->ps & 8) != 0)
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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#define task_pt_regs(task) \
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((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
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#define current_pt_regs() \
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((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1)
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#define signal_pt_regs current_pt_regs
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#define force_successful_syscall_return() (current_pt_regs()->r0 = 0)
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#endif
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#endif
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