10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 56812Sraf * Common Development and Distribution License (the "License"). 66812Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 216812Sraf 220Sstevel@tonic-gate/* 236812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "syscall.s" 280Sstevel@tonic-gate 296812Sraf#include "SYS.h" 300Sstevel@tonic-gate#include <sys/trap.h> 310Sstevel@tonic-gate 320Sstevel@tonic-gate ANSI_PRAGMA_WEAK(syscall,function) 330Sstevel@tonic-gate 340Sstevel@tonic-gate/* 356812Sraf * See sparc/sys/syscall.s to understand why _syscall6() exists. 360Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 376812Sraf * difference being that _syscall6 is not an exported symbol. 380Sstevel@tonic-gate */ 396812Sraf ENTRY2(syscall,_syscall6) 400Sstevel@tonic-gate popl %edx / return address 410Sstevel@tonic-gate popl %eax / system call number 420Sstevel@tonic-gate pushl %edx 430Sstevel@tonic-gate#if defined(_SYSC_INSN) 440Sstevel@tonic-gate .byte 0xf, 0x5 /* syscall */ 450Sstevel@tonic-gate#elif defined(_SEP_INSN) 460Sstevel@tonic-gate call 8f 470Sstevel@tonic-gate8: popl %edx 480Sstevel@tonic-gate movl %esp, %ecx 490Sstevel@tonic-gate addl $[9f - 8b], %edx 500Sstevel@tonic-gate sysenter 510Sstevel@tonic-gate9: 520Sstevel@tonic-gate#else 530Sstevel@tonic-gate int $T_SYSCALLINT 540Sstevel@tonic-gate#endif 550Sstevel@tonic-gate movl 0(%esp), %edx 560Sstevel@tonic-gate pushl %edx / restore the return address 570Sstevel@tonic-gate SYSCERROR 580Sstevel@tonic-gate ret 596812Sraf SET_SIZE(syscall) 600Sstevel@tonic-gate SET_SIZE(_syscall6) 610Sstevel@tonic-gate 620Sstevel@tonic-gate/* 630Sstevel@tonic-gate * See sparc/sys/syscall.s to understand why __systemcall6() exists. 640Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 650Sstevel@tonic-gate * difference being that __systemcall6 is not an exported symbol. 660Sstevel@tonic-gate * 670Sstevel@tonic-gate * WARNING WARNING WARNING: 680Sstevel@tonic-gate * The int $T_SYSCALL instruction below is needed by /proc when it scans a 690Sstevel@tonic-gate * controlled process's text for a syscall instruction. It must be present in 700Sstevel@tonic-gate * all libc variants because /proc cannot use an optimized syscall instruction 710Sstevel@tonic-gate * to enter the kernel; optimized syscalls could be disabled by private LDT use. 720Sstevel@tonic-gate * We must leave at least one int $T_SYSCALLINT in the text for /proc to find 730Sstevel@tonic-gate * (see the Pscantext() routine). 740Sstevel@tonic-gate */ 750Sstevel@tonic-gate ENTRY2(__systemcall,__systemcall6) 760Sstevel@tonic-gate popl %edx / return address 770Sstevel@tonic-gate popl %ecx / structure return address 780Sstevel@tonic-gate popl %eax / system call number 790Sstevel@tonic-gate pushl %edx 800Sstevel@tonic-gate int $T_SYSCALLINT 810Sstevel@tonic-gate jae 1f 820Sstevel@tonic-gate / error; clear syscall return values in the structure 830Sstevel@tonic-gate movl $-1, 0(%ecx) / sys_rval1 840Sstevel@tonic-gate movl $-1, 4(%ecx) / sys_rval2 850Sstevel@tonic-gate jmp 2f / %eax contains the error number 860Sstevel@tonic-gate1: 870Sstevel@tonic-gate / no error; copy syscall return values to the structure 880Sstevel@tonic-gate movl %eax, 0(%ecx) / sys_rval1 890Sstevel@tonic-gate movl %edx, 4(%ecx) / sys_rval2 900Sstevel@tonic-gate xorl %eax, %eax / no error, set %eax to zero 910Sstevel@tonic-gate2: 920Sstevel@tonic-gate movl 0(%esp), %edx / Restore the stack frame to original size 930Sstevel@tonic-gate pushl %ecx 940Sstevel@tonic-gate pushl %edx / restore the return address 950Sstevel@tonic-gate ret 960Sstevel@tonic-gate SET_SIZE(__systemcall) 970Sstevel@tonic-gate SET_SIZE(__systemcall6) 98