1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _LIBC_AMD64_INC_SYS_H 28 #define _LIBC_AMD64_INC_SYS_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * This file defines common code sequences for system calls. 34 */ 35 #include <sys/asm_linkage.h> 36 #include <sys/syscall.h> 37 #include <sys/errno.h> 38 39 #define _fref_(name) name@PLT 40 #define _daref_(name) name@GOTPCREL(%rip) 41 #define _sref_(name) name(%rip) 42 43 /* 44 * Define the external symbol __cerror for all files. 45 */ 46 .globl __cerror 47 48 /* 49 * __SYSCALL provides the basic trap sequence. It assumes that 50 * an entry of the form SYS_name exists (from sys/syscall.h). 51 * Note that %rcx is smashed by the syscall instruction, 52 * so we move it to %r10 in order to pass it to the kernel. 53 */ 54 #define __SYSCALL(name) \ 55 movq %rcx, %r10; \ 56 /* CSTYLED */ \ 57 movl $SYS_/**/name, %eax; \ 58 syscall 59 60 #define SYSTRAP_RVAL1(name) __SYSCALL(name) 61 #define SYSTRAP_RVAL2(name) __SYSCALL(name) 62 #define SYSTRAP_2RVALS(name) __SYSCALL(name) 63 #define SYSTRAP_64RVAL(name) __SYSCALL(name) 64 65 /* 66 * SYSFASTTRAP provides the fast system call trap sequence. It assumes 67 * that an entry of the form T_name exists (probably from sys/trap.h). 68 */ 69 #define SYSFASTTRAP(name) \ 70 /* CSTYLED */ \ 71 movl $T_/**/name, %eax; \ 72 int $T_FASTTRAP 73 74 /* 75 * SYSCERROR provides the sequence to branch to __cerror if an error is 76 * indicated by the carry-bit being set upon return from a trap. 77 */ 78 #define SYSCERROR \ 79 jb __cerror 80 81 /* 82 * SYSLWPERR provides the sequence to return 0 on a successful trap 83 * and the error code if unsuccessful. 84 * Error is indicated by the carry-bit being set upon return from a trap. 85 */ 86 #define SYSLWPERR \ 87 jae 1f; \ 88 cmpl $ERESTART, %eax; \ 89 jne 2f; \ 90 movl $EINTR, %eax; \ 91 jmp 2f; \ 92 1: \ 93 xorq %rax, %rax; \ 94 2: 95 96 /* 97 * SYSREENTRY provides the entry sequence for restartable system calls. 98 */ 99 #define SYSREENTRY(name) \ 100 ENTRY(name); \ 101 1: 102 103 /* 104 * SYSRESTART provides the error handling sequence for restartable 105 * system calls. 106 * XX64 -- Are all of the argument registers restored to their 107 * original values on an ERESTART return (including %rcx)? 108 */ 109 #define SYSRESTART(name) \ 110 jae 1f; \ 111 cmpl $ERESTART, %eax; \ 112 je 1b; \ 113 jmp __cerror; \ 114 1: 115 116 /* 117 * SYSINTR_RESTART provides the error handling sequence for restartable 118 * system calls in case of EINTR or ERESTART. 119 */ 120 #define SYSINTR_RESTART(name) \ 121 jae 1f; \ 122 cmpl $ERESTART, %eax; \ 123 je 1b; \ 124 cmpl $EINTR, %eax; \ 125 je 1b; \ 126 jmp 2f; \ 127 1: \ 128 xorq %rax, %rax; \ 129 2: 130 131 /* 132 * SYSCALL provides the standard (i.e.: most common) system call sequence. 133 */ 134 #define SYSCALL(name) \ 135 ENTRY(name); \ 136 SYSTRAP_2RVALS(name); \ 137 SYSCERROR 138 139 #define SYSCALL_RVAL1(name) \ 140 ENTRY(name); \ 141 SYSTRAP_RVAL1(name); \ 142 SYSCERROR 143 144 /* 145 * SYSCALL64 provides the standard (i.e.: most common) system call sequence 146 * for system calls that return 64-bit values. 147 */ 148 #define SYSCALL64(name) \ 149 SYSCALL(name) 150 151 /* 152 * SYSCALL_RESTART provides the most common restartable system call sequence. 153 */ 154 #define SYSCALL_RESTART(name) \ 155 SYSREENTRY(name); \ 156 SYSTRAP_2RVALS(name); \ 157 SYSRESTART() 158 159 #define SYSCALL_RESTART_RVAL1(name) \ 160 SYSREENTRY(name); \ 161 SYSTRAP_RVAL1(name); \ 162 SYSRESTART() 163 164 /* 165 * SYSCALL2 provides a common system call sequence when the entry name 166 * is different than the trap name. 167 */ 168 #define SYSCALL2(entryname, trapname) \ 169 ENTRY(entryname); \ 170 SYSTRAP_2RVALS(trapname); \ 171 SYSCERROR 172 173 #define SYSCALL2_RVAL1(entryname, trapname) \ 174 ENTRY(entryname); \ 175 SYSTRAP_RVAL1(trapname); \ 176 SYSCERROR 177 178 /* 179 * SYSCALL2_RESTART provides a common restartable system call sequence when the 180 * entry name is different than the trap name. 181 */ 182 #define SYSCALL2_RESTART(entryname, trapname) \ 183 SYSREENTRY(entryname); \ 184 SYSTRAP_2RVALS(trapname); \ 185 SYSRESTART() 186 187 #define SYSCALL2_RESTART_RVAL1(entryname, trapname) \ 188 SYSREENTRY(entryname); \ 189 SYSTRAP_RVAL1(trapname); \ 190 SYSRESTART() 191 192 /* 193 * SYSCALL_NOERROR provides the most common system call sequence for those 194 * system calls which don't check the error reture (carry bit). 195 */ 196 #define SYSCALL_NOERROR(name) \ 197 ENTRY(name); \ 198 SYSTRAP_2RVALS(name) 199 200 #define SYSCALL_NOERROR_RVAL1(name) \ 201 ENTRY(name); \ 202 SYSTRAP_RVAL1(name) 203 204 /* 205 * Standard syscall return sequence, return code equal to rval1. 206 */ 207 #define RET \ 208 ret 209 210 /* 211 * Syscall return sequence, return code equal to rval2. 212 */ 213 #define RET2 \ 214 movq %rdx, %rax; \ 215 ret 216 217 /* 218 * Syscall return sequence with return code forced to zero. 219 */ 220 #define RETC \ 221 xorq %rax, %rax; \ 222 ret 223 224 #endif /* _LIBC_AMD64_INC_SYS_H */ 225