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