294156a7ff
* 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
/* $FreeBSD$ */
|
|
/* From: NetBSD: frame.h,v 1.4 1997/04/06 08:47:27 cgd Exp */
|
|
|
|
/*
|
|
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Chris G. Demetriou
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
#ifndef _ALPHA_FRAME_H_
|
|
#define _ALPHA_FRAME_H_
|
|
|
|
#include <machine/alpha_cpu.h>
|
|
|
|
/*
|
|
* Software trap, exception, and syscall frame.
|
|
*
|
|
* Includes "hardware" (PALcode) frame.
|
|
*
|
|
* PALcode puts ALPHA_HWFRAME_* fields on stack. We have to add
|
|
* all of the general-purpose registers except for zero, for sp
|
|
* (which is automatically saved in the PCB's USP field for entries
|
|
* from user mode, and which is implicitly saved and restored by the
|
|
* calling conventions for entries from kernel mode), and (on traps
|
|
* and exceptions) for a0, a1, and a2 (which are saved by PALcode).
|
|
*/
|
|
|
|
/* Quadword offsets of the registers to be saved. */
|
|
#define FRAME_V0 0
|
|
#define FRAME_T0 1
|
|
#define FRAME_T1 2
|
|
#define FRAME_T2 3
|
|
#define FRAME_T3 4
|
|
#define FRAME_T4 5
|
|
#define FRAME_T5 6
|
|
#define FRAME_T6 7
|
|
#define FRAME_T7 8
|
|
#define FRAME_S0 9
|
|
#define FRAME_S1 10
|
|
#define FRAME_S2 11
|
|
#define FRAME_S3 12
|
|
#define FRAME_S4 13
|
|
#define FRAME_S5 14
|
|
#define FRAME_S6 15
|
|
#define FRAME_A3 16
|
|
#define FRAME_A4 17
|
|
#define FRAME_A5 18
|
|
#define FRAME_T8 19
|
|
#define FRAME_T9 20
|
|
#define FRAME_T10 21
|
|
#define FRAME_T11 22
|
|
#define FRAME_RA 23
|
|
#define FRAME_T12 24
|
|
#define FRAME_AT 25
|
|
#define FRAME_SP 26
|
|
#define FRAME_FLAGS 27
|
|
#define FRAME_FLAGS_SYSCALL 1 /* partial frame for syscalls */
|
|
/* The following are set only when a signal is to be delivered to a process. */
|
|
#define FRAME_TRAPARG_A0 28
|
|
#define FRAME_TRAPARG_A1 29
|
|
#define FRAME_TRAPARG_A2 30
|
|
|
|
#define FRAME_SW_SIZE (FRAME_TRAPARG_A2 + 1)
|
|
#define FRAME_HW_OFFSET FRAME_SW_SIZE
|
|
|
|
#define FRAME_PS (FRAME_HW_OFFSET + ALPHA_HWFRAME_PS)
|
|
#define FRAME_PC (FRAME_HW_OFFSET + ALPHA_HWFRAME_PC)
|
|
#define FRAME_GP (FRAME_HW_OFFSET + ALPHA_HWFRAME_GP)
|
|
#define FRAME_A0 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A0)
|
|
#define FRAME_A1 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A1)
|
|
#define FRAME_A2 (FRAME_HW_OFFSET + ALPHA_HWFRAME_A2)
|
|
|
|
#define FRAME_HW_SIZE ALPHA_HWFRAME_SIZE
|
|
#define FRAME_SIZE (FRAME_HW_OFFSET + FRAME_HW_SIZE)
|
|
|
|
struct trapframe {
|
|
unsigned long tf_regs[FRAME_SIZE]; /* See above */
|
|
};
|
|
|
|
#endif /* _ALPHA_FRAME_H_ */
|