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