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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/alpha/include/uapi/asm/ptrace.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _UAPI_ASMAXP_PTRACE_H

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#define _UAPI_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. It 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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/* This makes the stack 16-byte aligned as GCC expects */

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	unsigned long __pad0;

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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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#ifndef __KERNEL__

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	unsigned long fp[32];	/* fp[31] is fpcr */

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#endif

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};

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#endif /* _UAPI_ASMAXP_PTRACE_H */

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