71fdcedd1d
* Optimise the return path for syscalls so that they only restore a minimal set of registers instead of performing a full exception_return. A new flag in the trapframe indicates that the frame only holds partial state. When it is necessary to perform a full state restore (e.g. after an execve or signal), the flag is cleared to force a full restore.
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* $FreeBSD$ */
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/* From: NetBSD: frame.h,v 1.4 1997/04/06 08:47:27 cgd Exp */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _ALPHA_FRAME_H_
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#define _ALPHA_FRAME_H_
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#include <machine/alpha_cpu.h>
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/*
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* Software trap, exception, and syscall frame.
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*
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* Includes "hardware" (PALcode) frame.
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*
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* PALcode puts ALPHA_HWFRAME_* fields on stack. We have to add
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* all of the general-purpose registers except for zero, for sp
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* (which is automatically saved in the PCB's USP field for entries
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* from user mode, and which is implicitly saved and restored by the
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* calling conventions for entries from kernel mode), and (on traps
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* and exceptions) for a0, a1, and a2 (which are saved by PALcode).
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*/
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/* Quadword offsets of the registers to be saved. */
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#define FRAME_V0 0
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#define FRAME_T0 1
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#define FRAME_T1 2
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#define FRAME_T2 3
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#define FRAME_T3 4
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#define FRAME_T4 5
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#define FRAME_T5 6
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#define FRAME_T6 7
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#define FRAME_T7 8
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#define FRAME_S0 9
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#define FRAME_S1 10
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#define FRAME_S2 11
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#define FRAME_S3 12
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#define FRAME_S4 13
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#define FRAME_S5 14
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#define FRAME_S6 15
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#define FRAME_A3 16
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#define FRAME_A4 17
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#define FRAME_A5 18
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#define FRAME_T8 19
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#define FRAME_T9 20
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#define FRAME_T10 21
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#define FRAME_T11 22
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#define FRAME_RA 23
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#define FRAME_T12 24
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#define FRAME_AT 25
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#define FRAME_SP 26
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#define FRAME_FLAGS 27
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#define FRAME_FLAGS_SYSCALL 1 /* partial frame for syscalls */
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/* The following are set only when a signal is to be delivered to a process. */
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#define FRAME_TRAPARG_A0 28
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#define FRAME_TRAPARG_A1 29
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#define FRAME_TRAPARG_A2 30
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#define FRAME_SW_SIZE (FRAME_TRAPARG_A2 + 1)
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#define FRAME_HW_OFFSET FRAME_SW_SIZE
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#define FRAME_PS (FRAME_HW_OFFSET + ALPHA_HWFRAME_PS)
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#define FRAME_PC (FRAME_HW_OFFSET + ALPHA_HWFRAME_PC)
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#define FRAME_GP (FRAME_HW_OFFSET + ALPHA_HWFRAME_GP)
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#define FRAME_A0 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A0)
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#define FRAME_A1 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A1)
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#define FRAME_A2 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A2)
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#define FRAME_HW_SIZE ALPHA_HWFRAME_SIZE
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#define FRAME_SIZE (FRAME_HW_OFFSET + FRAME_HW_SIZE)
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struct trapframe {
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unsigned long tf_regs[FRAME_SIZE]; /* See above */
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};
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#endif /* _ALPHA_FRAME_H_ */
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