17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57257d1b4Sraf * Common Development and Distribution License (the "License"). 67257d1b4Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217257d1b4Sraf 227c478bd9Sstevel@tonic-gate/* 237257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 279a70fc3bSMark J. Nelson .file "syscall.s" 287c478bd9Sstevel@tonic-gate 297257d1b4Sraf#include "SYS.h" 307c478bd9Sstevel@tonic-gate#include <sys/trap.h> 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(syscall,function) 337c478bd9Sstevel@tonic-gate 347c478bd9Sstevel@tonic-gate/* 357257d1b4Sraf * See sparc/sys/syscall.s to understand why _syscall6() exists. 367c478bd9Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 377257d1b4Sraf * difference being that _syscall6 is not an exported symbol. 387c478bd9Sstevel@tonic-gate */ 397257d1b4Sraf ENTRY2(syscall,_syscall6) 407c478bd9Sstevel@tonic-gate popl %edx / return address 417c478bd9Sstevel@tonic-gate popl %eax / system call number 427c478bd9Sstevel@tonic-gate pushl %edx 437c478bd9Sstevel@tonic-gate#if defined(_SYSC_INSN) 447c478bd9Sstevel@tonic-gate .byte 0xf, 0x5 /* syscall */ 457c478bd9Sstevel@tonic-gate#elif defined(_SEP_INSN) 467c478bd9Sstevel@tonic-gate call 8f 477c478bd9Sstevel@tonic-gate8: popl %edx 487c478bd9Sstevel@tonic-gate movl %esp, %ecx 497c478bd9Sstevel@tonic-gate addl $[9f - 8b], %edx 507c478bd9Sstevel@tonic-gate sysenter 517c478bd9Sstevel@tonic-gate9: 527c478bd9Sstevel@tonic-gate#else 537c478bd9Sstevel@tonic-gate int $T_SYSCALLINT 547c478bd9Sstevel@tonic-gate#endif 557c478bd9Sstevel@tonic-gate movl 0(%esp), %edx 567c478bd9Sstevel@tonic-gate pushl %edx / restore the return address 577c478bd9Sstevel@tonic-gate SYSCERROR 587c478bd9Sstevel@tonic-gate ret 597257d1b4Sraf SET_SIZE(syscall) 607c478bd9Sstevel@tonic-gate SET_SIZE(_syscall6) 617c478bd9Sstevel@tonic-gate 627c478bd9Sstevel@tonic-gate/* 637c478bd9Sstevel@tonic-gate * See sparc/sys/syscall.s to understand why __systemcall6() exists. 647c478bd9Sstevel@tonic-gate * On x86, the implementation of the two are the same, the only 657c478bd9Sstevel@tonic-gate * difference being that __systemcall6 is not an exported symbol. 667c478bd9Sstevel@tonic-gate * 677c478bd9Sstevel@tonic-gate * WARNING WARNING WARNING: 687c478bd9Sstevel@tonic-gate * The int $T_SYSCALL instruction below is needed by /proc when it scans a 697c478bd9Sstevel@tonic-gate * controlled process's text for a syscall instruction. It must be present in 707c478bd9Sstevel@tonic-gate * all libc variants because /proc cannot use an optimized syscall instruction 717c478bd9Sstevel@tonic-gate * to enter the kernel; optimized syscalls could be disabled by private LDT use. 727c478bd9Sstevel@tonic-gate * We must leave at least one int $T_SYSCALLINT in the text for /proc to find 737c478bd9Sstevel@tonic-gate * (see the Pscantext() routine). 747c478bd9Sstevel@tonic-gate */ 757c478bd9Sstevel@tonic-gate ENTRY2(__systemcall,__systemcall6) 767c478bd9Sstevel@tonic-gate popl %edx / return address 777c478bd9Sstevel@tonic-gate popl %ecx / structure return address 787c478bd9Sstevel@tonic-gate popl %eax / system call number 797c478bd9Sstevel@tonic-gate pushl %edx 807c478bd9Sstevel@tonic-gate int $T_SYSCALLINT 817c478bd9Sstevel@tonic-gate jae 1f 827c478bd9Sstevel@tonic-gate / error; clear syscall return values in the structure 837c478bd9Sstevel@tonic-gate movl $-1, 0(%ecx) / sys_rval1 847c478bd9Sstevel@tonic-gate movl $-1, 4(%ecx) / sys_rval2 857c478bd9Sstevel@tonic-gate jmp 2f / %eax contains the error number 867c478bd9Sstevel@tonic-gate1: 877c478bd9Sstevel@tonic-gate / no error; copy syscall return values to the structure 887c478bd9Sstevel@tonic-gate movl %eax, 0(%ecx) / sys_rval1 897c478bd9Sstevel@tonic-gate movl %edx, 4(%ecx) / sys_rval2 907c478bd9Sstevel@tonic-gate xorl %eax, %eax / no error, set %eax to zero 917c478bd9Sstevel@tonic-gate2: 927c478bd9Sstevel@tonic-gate movl 0(%esp), %edx / Restore the stack frame to original size 937c478bd9Sstevel@tonic-gate pushl %ecx 947c478bd9Sstevel@tonic-gate pushl %edx / restore the return address 957c478bd9Sstevel@tonic-gate ret 967c478bd9Sstevel@tonic-gate SET_SIZE(__systemcall) 977c478bd9Sstevel@tonic-gate SET_SIZE(__systemcall6) 98