1*0Sstevel@tonic-gate/* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate/* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate#pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate .file "%M%" 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate#include <sys/asm_linkage.h> 32*0Sstevel@tonic-gate#include <sys/trap.h> 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate ANSI_PRAGMA_WEAK(syscall,function) 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate#include "SYS.h" 37*0Sstevel@tonic-gate 38*0Sstevel@tonic-gate#undef _syscall /* override "synonyms.h" */ 39*0Sstevel@tonic-gate#undef __systemcall 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate/* 42*0Sstevel@tonic-gate * See sparc/sys/syscall.s to understand why __syscall6() exists. 43*0Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 44*0Sstevel@tonic-gate * difference being that __syscall6 is not an exported symbol. 45*0Sstevel@tonic-gate */ 46*0Sstevel@tonic-gate ENTRY2(_syscall,_syscall6) 47*0Sstevel@tonic-gate popl %edx / return address 48*0Sstevel@tonic-gate popl %eax / system call number 49*0Sstevel@tonic-gate pushl %edx 50*0Sstevel@tonic-gate#if defined(_SYSC_INSN) 51*0Sstevel@tonic-gate .byte 0xf, 0x5 /* syscall */ 52*0Sstevel@tonic-gate#elif defined(_SEP_INSN) 53*0Sstevel@tonic-gate call 8f 54*0Sstevel@tonic-gate8: popl %edx 55*0Sstevel@tonic-gate movl %esp, %ecx 56*0Sstevel@tonic-gate addl $[9f - 8b], %edx 57*0Sstevel@tonic-gate sysenter 58*0Sstevel@tonic-gate9: 59*0Sstevel@tonic-gate#else 60*0Sstevel@tonic-gate int $T_SYSCALLINT 61*0Sstevel@tonic-gate#endif 62*0Sstevel@tonic-gate movl 0(%esp), %edx 63*0Sstevel@tonic-gate pushl %edx / restore the return address 64*0Sstevel@tonic-gate SYSCERROR 65*0Sstevel@tonic-gate ret 66*0Sstevel@tonic-gate SET_SIZE(_syscall) 67*0Sstevel@tonic-gate SET_SIZE(_syscall6) 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate/* 70*0Sstevel@tonic-gate * See sparc/sys/syscall.s to understand why __systemcall6() exists. 71*0Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 72*0Sstevel@tonic-gate * difference being that __systemcall6 is not an exported symbol. 73*0Sstevel@tonic-gate * 74*0Sstevel@tonic-gate * WARNING WARNING WARNING: 75*0Sstevel@tonic-gate * The int $T_SYSCALL instruction below is needed by /proc when it scans a 76*0Sstevel@tonic-gate * controlled process's text for a syscall instruction. It must be present in 77*0Sstevel@tonic-gate * all libc variants because /proc cannot use an optimized syscall instruction 78*0Sstevel@tonic-gate * to enter the kernel; optimized syscalls could be disabled by private LDT use. 79*0Sstevel@tonic-gate * We must leave at least one int $T_SYSCALLINT in the text for /proc to find 80*0Sstevel@tonic-gate * (see the Pscantext() routine). 81*0Sstevel@tonic-gate */ 82*0Sstevel@tonic-gate ENTRY2(__systemcall,__systemcall6) 83*0Sstevel@tonic-gate popl %edx / return address 84*0Sstevel@tonic-gate popl %ecx / structure return address 85*0Sstevel@tonic-gate popl %eax / system call number 86*0Sstevel@tonic-gate pushl %edx 87*0Sstevel@tonic-gate int $T_SYSCALLINT 88*0Sstevel@tonic-gate jae 1f 89*0Sstevel@tonic-gate / error; clear syscall return values in the structure 90*0Sstevel@tonic-gate movl $-1, 0(%ecx) / sys_rval1 91*0Sstevel@tonic-gate movl $-1, 4(%ecx) / sys_rval2 92*0Sstevel@tonic-gate jmp 2f / %eax contains the error number 93*0Sstevel@tonic-gate1: 94*0Sstevel@tonic-gate / no error; copy syscall return values to the structure 95*0Sstevel@tonic-gate movl %eax, 0(%ecx) / sys_rval1 96*0Sstevel@tonic-gate movl %edx, 4(%ecx) / sys_rval2 97*0Sstevel@tonic-gate xorl %eax, %eax / no error, set %eax to zero 98*0Sstevel@tonic-gate2: 99*0Sstevel@tonic-gate movl 0(%esp), %edx / Restore the stack frame to original size 100*0Sstevel@tonic-gate pushl %ecx 101*0Sstevel@tonic-gate pushl %edx / restore the return address 102*0Sstevel@tonic-gate ret 103*0Sstevel@tonic-gate SET_SIZE(__systemcall) 104*0Sstevel@tonic-gate SET_SIZE(__systemcall6) 105