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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _LIBC_I386_INC_SYS_H 28 #define _LIBC_I386_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/trap.h> 38 #include <sys/errno.h> 39 #include "synonyms.h" 40 41 #define _prologue_ \ 42 pushl %ebx; \ 43 call 9f; \ 44 9: \ 45 popl %ebx; \ 46 addl $_GLOBAL_OFFSET_TABLE_ + [. - 9b], %ebx 47 48 #define _epilogue_ \ 49 popl %ebx 50 51 #define _fref_(name) name@PLT 52 #define _daref_(name) name@GOT(%ebx) 53 #define _sref_(name) name@GOTOFF(%ebx) 54 #define _esp_(offset) offset+4(%esp) /* add 4 for the saved %ebx */ 55 56 /* 57 * Define the external symbols __cerror and __cerror64 for all files. 58 */ 59 .globl __cerror 60 .globl __cerror64 61 62 /* 63 * __SYSCALLINT provides the basic trap sequence. It assumes that an entry 64 * of the form SYS_name exists (probably from sys/syscall.h). 65 */ 66 67 #define __SYSCALLINT(name) \ 68 /* CSTYLED */ \ 69 movl $SYS_/**/name, %eax; \ 70 int $T_SYSCALLINT 71 72 /* 73 * __SYSENTER provides a faster variant that is only able to 74 * return rval1. Note that %ecx and %edx are ALWAYS smashed. 75 */ 76 #define __SYSENTER(name) \ 77 call 8f; \ 78 8: popl %edx; \ 79 /* CSTYLED */ \ 80 movl $SYS_/**/name, %eax; \ 81 movl %esp, %ecx; \ 82 add $[9f - 8b], %edx; \ 83 sysenter; \ 84 9: 85 86 /* 87 * __SYSCALL provides a faster variant on processors and kernels 88 * that support it. Note that %ecx is ALWAYS smashed. 89 */ 90 #define __SYSCALL(name) \ 91 /* CSTYLED */ \ 92 movl $SYS_/**/name, %eax; \ 93 .byte 0xf, 0x5 /* syscall */ 94 95 #if defined(_SYSC_INSN) 96 #define SYSTRAP_RVAL1(name) __SYSCALL(name) 97 #define SYSTRAP_RVAL2(name) __SYSCALL(name) 98 #define SYSTRAP_2RVALS(name) __SYSCALL(name) 99 #define SYSTRAP_64RVAL(name) __SYSCALL(name) 100 #else /* _SYSC_INSN */ 101 #if defined(_SEP_INSN) 102 #define SYSTRAP_RVAL1(name) __SYSENTER(name) 103 #else /* _SEP_INSN */ 104 #define SYSTRAP_RVAL1(name) __SYSCALLINT(name) 105 #endif /* _SEP_INSN */ 106 #define SYSTRAP_RVAL2(name) __SYSCALLINT(name) 107 #define SYSTRAP_2RVALS(name) __SYSCALLINT(name) 108 #define SYSTRAP_64RVAL(name) __SYSCALLINT(name) 109 #endif /* _SYSC_INSN */ 110 111 /* 112 * SYSFASTTRAP provides the fast system call trap sequence. It assumes 113 * that an entry of the form T_name exists (probably from sys/trap.h). 114 */ 115 #define SYSFASTTRAP(name) \ 116 /* CSTYLED */ \ 117 movl $T_/**/name, %eax; \ 118 int $T_FASTTRAP 119 120 /* 121 * SYSCERROR provides the sequence to branch to __cerror if an error is 122 * indicated by the carry-bit being set upon return from a trap. 123 */ 124 #define SYSCERROR \ 125 jb __cerror 126 127 /* 128 * SYSCERROR64 provides the sequence to branch to __cerror64 if an error is 129 * indicated by the carry-bit being set upon return from a trap. 130 */ 131 #define SYSCERROR64 \ 132 jb __cerror64 133 134 /* 135 * SYSLWPERR provides the sequence to return 0 on a successful trap 136 * and the error code if unsuccessful. 137 * Error is indicated by the carry-bit being set upon return from a trap. 138 */ 139 #define SYSLWPERR \ 140 jae 1f; \ 141 cmpl $ERESTART, %eax; \ 142 jne 2f; \ 143 movl $EINTR, %eax; \ 144 jmp 2f; \ 145 1: \ 146 xorl %eax, %eax; \ 147 2: 148 149 /* 150 * SYSREENTRY provides the entry sequence for restartable system calls. 151 */ 152 #define SYSREENTRY(name) \ 153 /* CSTYLED */ \ 154 .restart_/**/name: \ 155 ENTRY(name) 156 157 /* 158 * SYSRESTART provides the error handling sequence for restartable 159 * system calls. 160 */ 161 #define SYSRESTART(name) \ 162 jae 1f; \ 163 cmpl $ERESTART, %eax; \ 164 je name; \ 165 jmp __cerror; \ 166 1: 167 168 /* 169 * SYSINTR_RESTART provides the error handling sequence for restartable 170 * system calls in case of EINTR or ERESTART. 171 */ 172 #define SYSINTR_RESTART(name) \ 173 jae 1f; \ 174 cmpl $ERESTART, %eax; \ 175 je name; \ 176 cmpl $EINTR, %eax; \ 177 je name; \ 178 jmp 2f; \ 179 1: \ 180 xorl %eax, %eax; \ 181 2: 182 183 /* 184 * SYSCALL provides the standard (i.e.: most common) system call sequence. 185 */ 186 #define SYSCALL(name) \ 187 ENTRY(name); \ 188 SYSTRAP_2RVALS(name); \ 189 SYSCERROR 190 191 #define SYSCALL_RVAL1(name) \ 192 ENTRY(name); \ 193 SYSTRAP_RVAL1(name); \ 194 SYSCERROR 195 196 /* 197 * SYSCALL64 provides the standard (i.e.: most common) system call sequence 198 * for system calls that return 64-bit values. 199 */ 200 #define SYSCALL64(name) \ 201 ENTRY(name); \ 202 SYSTRAP_64RVAL(name); \ 203 SYSCERROR64 204 205 /* 206 * SYSCALL_RESTART provides the most common restartable system call sequence. 207 */ 208 #define SYSCALL_RESTART(name) \ 209 SYSREENTRY(name); \ 210 SYSTRAP_2RVALS(name); \ 211 /* CSTYLED */ \ 212 SYSRESTART(.restart_/**/name) 213 214 #define SYSCALL_RESTART_RVAL1(name) \ 215 SYSREENTRY(name); \ 216 SYSTRAP_RVAL1(name); \ 217 /* CSTYLED */ \ 218 SYSRESTART(.restart_/**/name) 219 220 /* 221 * SYSCALL2 provides a common system call sequence when the entry name 222 * is different than the trap name. 223 */ 224 #define SYSCALL2(entryname, trapname) \ 225 ENTRY(entryname); \ 226 SYSTRAP_2RVALS(trapname); \ 227 SYSCERROR 228 229 #define SYSCALL2_RVAL1(entryname, trapname) \ 230 ENTRY(entryname); \ 231 SYSTRAP_RVAL1(trapname); \ 232 SYSCERROR 233 234 /* 235 * SYSCALL2_RESTART provides a common restartable system call sequence when the 236 * entry name is different than the trap name. 237 */ 238 #define SYSCALL2_RESTART(entryname, trapname) \ 239 SYSREENTRY(entryname); \ 240 SYSTRAP_2RVALS(trapname); \ 241 /* CSTYLED */ \ 242 SYSRESTART(.restart_/**/entryname) 243 244 #define SYSCALL2_RESTART_RVAL1(entryname, trapname) \ 245 SYSREENTRY(entryname); \ 246 SYSTRAP_RVAL1(trapname); \ 247 /* CSTYLED */ \ 248 SYSRESTART(.restart_/**/entryname) 249 250 /* 251 * SYSCALL_NOERROR provides the most common system call sequence for those 252 * system calls which don't check the error return (carry bit). 253 */ 254 #define SYSCALL_NOERROR(name) \ 255 ENTRY(name); \ 256 SYSTRAP_2RVALS(name) 257 258 #define SYSCALL_NOERROR_RVAL1(name) \ 259 ENTRY(name); \ 260 SYSTRAP_RVAL1(name) 261 262 /* 263 * Standard syscall return sequence, return code equal to rval1. 264 */ 265 #define RET \ 266 ret 267 268 /* 269 * Syscall return sequence, return code equal to rval2. 270 */ 271 #define RET2 \ 272 movl %edx, %eax; \ 273 ret 274 275 /* 276 * Syscall return sequence with return code forced to zero. 277 */ 278 #define RETC \ 279 xorl %eax, %eax; \ 280 ret 281 282 #endif /* _LIBC_I386_INC_SYS_H */ 283