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 /* 31 * This file defines common code sequences for system calls. 32 */ 33 #include <sys/asm_linkage.h> 34 #include <sys/syscall.h> 35 #include <sys/errno.h> 36 37 #define _fref_(name) name@PLT 38 #define _daref_(name) name@GOTPCREL(%rip) 39 #define _sref_(name) name(%rip) 40 41 /* 42 * Define the external symbol __cerror for all files. 43 */ 44 .globl __cerror 45 46 /* 47 * __SYSCALL provides the basic trap sequence. It assumes that 48 * an entry of the form SYS_name exists (from sys/syscall.h). 49 * Note that %rcx is smashed by the syscall instruction, 50 * so we move it to %r10 in order to pass it to the kernel. 51 */ 52 #define __SYSCALL(name) \ 53 movq %rcx, %r10; \ 54 /* CSTYLED */ \ 55 movl $SYS_##name, %eax; \ 56 syscall 57 58 #define SYSTRAP_RVAL1(name) __SYSCALL(name) 59 #define SYSTRAP_RVAL2(name) __SYSCALL(name) 60 #define SYSTRAP_2RVALS(name) __SYSCALL(name) 61 #define SYSTRAP_64RVAL(name) __SYSCALL(name) 62 63 /* 64 * SYSFASTTRAP provides the fast system call trap sequence. It assumes 65 * that an entry of the form T_name exists (probably from sys/trap.h). 66 */ 67 #define SYSFASTTRAP(name) \ 68 /* CSTYLED */ \ 69 movl $T_##name, %eax; \ 70 int $T_FASTTRAP 71 72 /* 73 * SYSCERROR provides the sequence to branch to __cerror if an error is 74 * indicated by the carry-bit being set upon return from a trap. 75 */ 76 #define SYSCERROR \ 77 jb __cerror 78 79 /* 80 * SYSLWPERR provides the sequence to return 0 on a successful trap 81 * and the error code if unsuccessful. 82 * Error is indicated by the carry-bit being set upon return from a trap. 83 */ 84 #define SYSLWPERR \ 85 jae 1f; \ 86 cmpl $ERESTART, %eax; \ 87 jne 2f; \ 88 movl $EINTR, %eax; \ 89 jmp 2f; \ 90 1: \ 91 xorq %rax, %rax; \ 92 2: 93 94 /* 95 * SYSREENTRY provides the entry sequence for restartable system calls. 96 */ 97 #define SYSREENTRY(name) \ 98 ENTRY(name); \ 99 1: 100 101 /* 102 * SYSRESTART provides the error handling sequence for restartable 103 * system calls. 104 * XX64 -- Are all of the argument registers restored to their 105 * original values on an ERESTART return (including %rcx)? 106 */ 107 #define SYSRESTART(name) \ 108 jae 1f; \ 109 cmpl $ERESTART, %eax; \ 110 je 1b; \ 111 jmp __cerror; \ 112 1: 113 114 /* 115 * SYSINTR_RESTART provides the error handling sequence for restartable 116 * system calls in case of EINTR or ERESTART. 117 */ 118 #define SYSINTR_RESTART(name) \ 119 jae 1f; \ 120 cmpl $ERESTART, %eax; \ 121 je 1b; \ 122 cmpl $EINTR, %eax; \ 123 je 1b; \ 124 jmp 2f; \ 125 1: \ 126 xorq %rax, %rax; \ 127 2: 128 129 /* 130 * SYSCALL provides the standard (i.e.: most common) system call sequence. 131 */ 132 #define SYSCALL(name) \ 133 ENTRY(name); \ 134 SYSTRAP_2RVALS(name); \ 135 SYSCERROR 136 137 #define SYSCALL_RVAL1(name) \ 138 ENTRY(name); \ 139 SYSTRAP_RVAL1(name); \ 140 SYSCERROR 141 142 /* 143 * SYSCALL64 provides the standard (i.e.: most common) system call sequence 144 * for system calls that return 64-bit values. 145 */ 146 #define SYSCALL64(name) \ 147 SYSCALL(name) 148 149 /* 150 * SYSCALL_RESTART provides the most common restartable system call sequence. 151 */ 152 #define SYSCALL_RESTART(name) \ 153 SYSREENTRY(name); \ 154 SYSTRAP_2RVALS(name); \ 155 SYSRESTART() 156 157 #define SYSCALL_RESTART_RVAL1(name) \ 158 SYSREENTRY(name); \ 159 SYSTRAP_RVAL1(name); \ 160 SYSRESTART() 161 162 /* 163 * SYSCALL2 provides a common system call sequence when the entry name 164 * is different than the trap name. 165 */ 166 #define SYSCALL2(entryname, trapname) \ 167 ENTRY(entryname); \ 168 SYSTRAP_2RVALS(trapname); \ 169 SYSCERROR 170 171 #define SYSCALL2_RVAL1(entryname, trapname) \ 172 ENTRY(entryname); \ 173 SYSTRAP_RVAL1(trapname); \ 174 SYSCERROR 175 176 /* 177 * SYSCALL2_RESTART provides a common restartable system call sequence when the 178 * entry name is different than the trap name. 179 */ 180 #define SYSCALL2_RESTART(entryname, trapname) \ 181 SYSREENTRY(entryname); \ 182 SYSTRAP_2RVALS(trapname); \ 183 SYSRESTART() 184 185 #define SYSCALL2_RESTART_RVAL1(entryname, trapname) \ 186 SYSREENTRY(entryname); \ 187 SYSTRAP_RVAL1(trapname); \ 188 SYSRESTART() 189 190 /* 191 * SYSCALL_NOERROR provides the most common system call sequence for those 192 * system calls which don't check the error reture (carry bit). 193 */ 194 #define SYSCALL_NOERROR(name) \ 195 ENTRY(name); \ 196 SYSTRAP_2RVALS(name) 197 198 #define SYSCALL_NOERROR_RVAL1(name) \ 199 ENTRY(name); \ 200 SYSTRAP_RVAL1(name) 201 202 /* 203 * Standard syscall return sequence, return code equal to rval1. 204 */ 205 #define RET \ 206 ret 207 208 /* 209 * Syscall return sequence, return code equal to rval2. 210 */ 211 #define RET2 \ 212 movq %rdx, %rax; \ 213 ret 214 215 /* 216 * Syscall return sequence with return code forced to zero. 217 */ 218 #define RETC \ 219 xorq %rax, %rax; \ 220 ret 221 222 #endif /* _LIBC_AMD64_INC_SYS_H */ 223