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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _LIBC_I386_INC_SYS_H
#define _LIBC_I386_INC_SYS_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This file defines common code sequences for system calls.
*/
#include <sys/asm_linkage.h>
#include <sys/syscall.h>
#include <sys/errno.h>
#define _prologue_ \
pushl %ebx; \
call 9f; \
9: \
popl %ebx; \
addl $_GLOBAL_OFFSET_TABLE_ + [. - 9b], %ebx
#define _epilogue_ \
popl %ebx
#define _fref_(name) name@PLT
#define _daref_(name) name@GOT(%ebx)
#define _sref_(name) name@GOTOFF(%ebx)
#define _esp_(offset) offset+4(%esp) /* add 4 for the saved %ebx */
/*
* Define the external symbols __cerror and __cerror64 for all files.
*/
.globl __cerror
.globl __cerror64
/*
* __SYSCALLINT provides the basic trap sequence. It assumes that an entry
* of the form SYS_name exists (probably from sys/syscall.h).
*/
#define __SYSCALLINT(name) \
/* CSTYLED */ \
movl $SYS_/**/name, %eax; \
int $T_SYSCALLINT
/*
* __SYSENTER provides a faster variant that is only able to
* return rval1. Note that %ecx and %edx are ALWAYS smashed.
*/
#define __SYSENTER(name) \
call 8f; \
8: popl %edx; \
/* CSTYLED */ \
movl $SYS_/**/name, %eax; \
movl %esp, %ecx; \
add $[9f - 8b], %edx; \
sysenter; \
9:
/*
* __SYSCALL provides a faster variant on processors and kernels
* that support it. Note that %ecx is ALWAYS smashed.
*/
#define __SYSCALL(name) \
/* CSTYLED */ \
movl $SYS_/**/name, %eax; \
.byte 0xf, 0x5 /* syscall */
#if defined(_SYSC_INSN)
#define SYSTRAP_RVAL1(name) __SYSCALL(name)
#define SYSTRAP_RVAL2(name) __SYSCALL(name)
#define SYSTRAP_2RVALS(name) __SYSCALL(name)
#define SYSTRAP_64RVAL(name) __SYSCALL(name)
#else /* _SYSC_INSN */
#if defined(_SEP_INSN)
#define SYSTRAP_RVAL1(name) __SYSENTER(name)
#else /* _SEP_INSN */
#define SYSTRAP_RVAL1(name) __SYSCALLINT(name)
#endif /* _SEP_INSN */
#define SYSTRAP_RVAL2(name) __SYSCALLINT(name)
#define SYSTRAP_2RVALS(name) __SYSCALLINT(name)
#define SYSTRAP_64RVAL(name) __SYSCALLINT(name)
#endif /* _SYSC_INSN */
/*
* SYSFASTTRAP provides the fast system call trap sequence. It assumes
* that an entry of the form T_name exists (probably from sys/trap.h).
*/
#define SYSFASTTRAP(name) \
/* CSTYLED */ \
movl $T_/**/name, %eax; \
int $T_FASTTRAP
/*
* SYSCERROR provides the sequence to branch to __cerror if an error is
* indicated by the carry-bit being set upon return from a trap.
*/
#define SYSCERROR \
jb __cerror
/*
* SYSCERROR64 provides the sequence to branch to __cerror64 if an error is
* indicated by the carry-bit being set upon return from a trap.
*/
#define SYSCERROR64 \
jb __cerror64
/*
* SYSLWPERR provides the sequence to return 0 on a successful trap
* and the error code if unsuccessful.
* Error is indicated by the carry-bit being set upon return from a trap.
*/
#define SYSLWPERR \
jae 1f; \
cmpl $ERESTART, %eax; \
jne 2f; \
movl $EINTR, %eax; \
jmp 2f; \
1: \
xorl %eax, %eax; \
2:
/*
* SYSREENTRY provides the entry sequence for restartable system calls.
*/
#define SYSREENTRY(name) \
/* CSTYLED */ \
.restart_/**/name: \
ENTRY(name)
/*
* SYSRESTART provides the error handling sequence for restartable
* system calls.
*/
#define SYSRESTART(name) \
jae 1f; \
cmpl $ERESTART, %eax; \
je name; \
jmp __cerror; \
1:
/*
* SYSINTR_RESTART provides the error handling sequence for restartable
* system calls in case of EINTR or ERESTART.
*/
#define SYSINTR_RESTART(name) \
jae 1f; \
cmpl $ERESTART, %eax; \
je name; \
cmpl $EINTR, %eax; \
je name; \
jmp 2f; \
1: \
xorl %eax, %eax; \
2:
/*
* SYSCALL provides the standard (i.e.: most common) system call sequence.
*/
#define SYSCALL(name) \
ENTRY(name); \
SYSTRAP_2RVALS(name); \
SYSCERROR
#define SYSCALL_RVAL1(name) \
ENTRY(name); \
SYSTRAP_RVAL1(name); \
SYSCERROR
/*
* SYSCALL64 provides the standard (i.e.: most common) system call sequence
* for system calls that return 64-bit values.
*/
#define SYSCALL64(name) \
ENTRY(name); \
SYSTRAP_64RVAL(name); \
SYSCERROR64
/*
* SYSCALL_RESTART provides the most common restartable system call sequence.
*/
#define SYSCALL_RESTART(name) \
SYSREENTRY(name); \
SYSTRAP_2RVALS(name); \
/* CSTYLED */ \
SYSRESTART(.restart_/**/name)
#define SYSCALL_RESTART_RVAL1(name) \
SYSREENTRY(name); \
SYSTRAP_RVAL1(name); \
/* CSTYLED */ \
SYSRESTART(.restart_/**/name)
/*
* SYSCALL2 provides a common system call sequence when the entry name
* is different than the trap name.
*/
#define SYSCALL2(entryname, trapname) \
ENTRY(entryname); \
SYSTRAP_2RVALS(trapname); \
SYSCERROR
#define SYSCALL2_RVAL1(entryname, trapname) \
ENTRY(entryname); \
SYSTRAP_RVAL1(trapname); \
SYSCERROR
/*
* SYSCALL2_RESTART provides a common restartable system call sequence when the
* entry name is different than the trap name.
*/
#define SYSCALL2_RESTART(entryname, trapname) \
SYSREENTRY(entryname); \
SYSTRAP_2RVALS(trapname); \
/* CSTYLED */ \
SYSRESTART(.restart_/**/entryname)
#define SYSCALL2_RESTART_RVAL1(entryname, trapname) \
SYSREENTRY(entryname); \
SYSTRAP_RVAL1(trapname); \
/* CSTYLED */ \
SYSRESTART(.restart_/**/entryname)
/*
* SYSCALL_NOERROR provides the most common system call sequence for those
* system calls which don't check the error return (carry bit).
*/
#define SYSCALL_NOERROR(name) \
ENTRY(name); \
SYSTRAP_2RVALS(name)
#define SYSCALL_NOERROR_RVAL1(name) \
ENTRY(name); \
SYSTRAP_RVAL1(name)
/*
* Standard syscall return sequence, return code equal to rval1.
*/
#define RET \
ret
/*
* Syscall return sequence, return code equal to rval2.
*/
#define RET2 \
movl %edx, %eax; \
ret
/*
* Syscall return sequence with return code forced to zero.
*/
#define RETC \
xorl %eax, %eax; \
ret
#endif /* _LIBC_I386_INC_SYS_H */
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