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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _LIBC_SPARC_INC_SYS_H 28 #define _LIBC_SPARC_INC_SYS_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * This file defines common code sequences for system calls. Note that 34 * it is assumed that __cerror is within the short branch distance from 35 * all the traps (so that a simple bcs can follow the trap, rather than 36 * a position independent code sequence.) Ditto for __cerror64. 37 */ 38 39 #include <sys/asm_linkage.h> 40 #include <sys/syscall.h> 41 #include <sys/errno.h> 42 #include "synonyms.h" 43 44 /* 45 * While it's tempting to imagine we could use 'rd %pc' here, 46 * in fact it's a rather slow operation that consumes many 47 * cycles, so we use the usual side-effect of 'call' instead. 48 */ 49 #define PIC_SETUP(r) \ 50 mov %o7, %g1; \ 51 9: call 8f; \ 52 sethi %hi(_GLOBAL_OFFSET_TABLE_ - (9b - .)), %r; \ 53 8: or %r, %lo(_GLOBAL_OFFSET_TABLE_ - (9b - .)), %r; \ 54 add %r, %o7, %r; \ 55 mov %g1, %o7 56 57 /* 58 * Trap number for system calls 59 */ 60 #define SYSCALL_TRAPNUM 8 61 #define FASTSCALL_TRAPNUM 9 62 63 /* 64 * Define the external symbols __cerror and __cerror64 for all files. 65 */ 66 .global __cerror 67 .global __cerror64 68 69 /* 70 * __SYSTRAP provides the basic trap sequence. It assumes that an entry 71 * of the form SYS_name exists (probably from sys/syscall.h). 72 */ 73 #define __SYSTRAP(name) \ 74 /* CSTYLED */ \ 75 mov SYS_/**/name, %g1; \ 76 ta SYSCALL_TRAPNUM 77 78 #define SYSTRAP_RVAL1(name) __SYSTRAP(name) 79 #define SYSTRAP_RVAL2(name) __SYSTRAP(name) 80 #define SYSTRAP_2RVALS(name) __SYSTRAP(name) 81 #define SYSTRAP_64RVAL(name) __SYSTRAP(name) 82 83 /* 84 * SYSFASTTRAP provides the fast system call trap sequence. It assumes 85 * that an entry of the form ST_name exists (probably from sys/trap.h). 86 */ 87 #define SYSFASTTRAP(name) \ 88 /* CSTYLED */ \ 89 ta ST_/**/name 90 91 /* 92 * SYSCERROR provides the sequence to branch to __cerror if an error is 93 * indicated by the carry-bit being set upon return from a trap. 94 */ 95 #define SYSCERROR \ 96 bcs __cerror; \ 97 nop 98 99 /* 100 * SYSCERROR64 provides the sequence to branch to __cerror64 if an error is 101 * indicated by the carry-bit being set upon return from a trap. 102 */ 103 #define SYSCERROR64 \ 104 bcs __cerror64; \ 105 nop 106 107 /* 108 * SYSLWPERR provides the sequence to return 0 on a successful trap 109 * and the error code if unsuccessful. 110 * Error is indicated by the carry-bit being set upon return from a trap. 111 */ 112 #define SYSLWPERR \ 113 /* CSTYLED */ \ 114 bcc,a,pt %icc, 1f; \ 115 clr %o0; \ 116 cmp %o0, ERESTART; \ 117 move %icc, EINTR, %o0; \ 118 1: 119 120 #define SAVE_OFFSET 68 121 122 /* 123 * SYSREENTRY provides the entry sequence for restartable system calls. 124 */ 125 #define SYSREENTRY(name) \ 126 ENTRY(name); \ 127 stn %o0, [%sp + SAVE_OFFSET]; \ 128 /* CSTYLED */ \ 129 .restart_/**/name: 130 131 /* 132 * SYSRESTART provides the error handling sequence for restartable 133 * system calls. 134 */ 135 #define SYSRESTART(name) \ 136 /* CSTYLED */ \ 137 bcc,pt %icc, 1f; \ 138 cmp %o0, ERESTART; \ 139 /* CSTYLED */ \ 140 be,a,pn %icc, name; \ 141 ldn [%sp + SAVE_OFFSET], %o0; \ 142 /* CSTYLED */ \ 143 ba,a __cerror; \ 144 1: 145 146 /* 147 * SYSINTR_RESTART provides the error handling sequence for restartable 148 * system calls in case of EINTR or ERESTART. 149 */ 150 #define SYSINTR_RESTART(name) \ 151 /* CSTYLED */ \ 152 bcc,a,pt %icc, 1f; \ 153 clr %o0; \ 154 cmp %o0, ERESTART; \ 155 /* CSTYLED */ \ 156 be,a,pn %icc, name; \ 157 ldn [%sp + SAVE_OFFSET], %o0; \ 158 cmp %o0, EINTR; \ 159 /* CSTYLED */ \ 160 be,a,pn %icc, name; \ 161 ldn [%sp + SAVE_OFFSET], %o0; \ 162 1: 163 164 /* 165 * SYSCALL provides the standard (i.e.: most common) system call sequence. 166 */ 167 #define SYSCALL(name) \ 168 ENTRY(name); \ 169 SYSTRAP_2RVALS(name); \ 170 SYSCERROR 171 172 #define SYSCALL_RVAL1(name) \ 173 ENTRY(name); \ 174 SYSTRAP_RVAL1(name); \ 175 SYSCERROR 176 177 /* 178 * SYSCALL64 provides the standard (i.e.: most common) system call sequence 179 * for system calls that return 64-bit values. 180 */ 181 #define SYSCALL64(name) \ 182 ENTRY(name); \ 183 SYSTRAP_64RVAL(name); \ 184 SYSCERROR64 185 186 /* 187 * SYSCALL_RESTART provides the most common restartable system call sequence. 188 */ 189 #define SYSCALL_RESTART(name) \ 190 SYSREENTRY(name); \ 191 SYSTRAP_2RVALS(name); \ 192 /* CSTYLED */ \ 193 SYSRESTART(.restart_/**/name) 194 195 #define SYSCALL_RESTART_RVAL1(name) \ 196 SYSREENTRY(name); \ 197 SYSTRAP_RVAL1(name); \ 198 /* CSTYLED */ \ 199 SYSRESTART(.restart_/**/name) 200 201 /* 202 * SYSCALL2 provides a common system call sequence when the entry name 203 * is different than the trap name. 204 */ 205 #define SYSCALL2(entryname, trapname) \ 206 ENTRY(entryname); \ 207 SYSTRAP_2RVALS(trapname); \ 208 SYSCERROR 209 210 #define SYSCALL2_RVAL1(entryname, trapname) \ 211 ENTRY(entryname); \ 212 SYSTRAP_RVAL1(trapname); \ 213 SYSCERROR 214 215 /* 216 * SYSCALL2_RESTART provides a common restartable system call sequence when the 217 * entry name is different than the trap name. 218 */ 219 #define SYSCALL2_RESTART(entryname, trapname) \ 220 SYSREENTRY(entryname); \ 221 SYSTRAP_2RVALS(trapname); \ 222 /* CSTYLED */ \ 223 SYSRESTART(.restart_/**/entryname) 224 225 #define SYSCALL2_RESTART_RVAL1(entryname, trapname) \ 226 SYSREENTRY(entryname); \ 227 SYSTRAP_RVAL1(trapname); \ 228 /* CSTYLED */ \ 229 SYSRESTART(.restart_/**/entryname) 230 231 /* 232 * SYSCALL_NOERROR provides the most common system call sequence for those 233 * system calls which don't check the error return (carry bit). 234 */ 235 #define SYSCALL_NOERROR(name) \ 236 ENTRY(name); \ 237 SYSTRAP_2RVALS(name) 238 239 #define SYSCALL_NOERROR_RVAL1(name) \ 240 ENTRY(name); \ 241 SYSTRAP_RVAL1(name) 242 243 /* 244 * Standard syscall return sequence, return code equal to rval1. 245 */ 246 #define RET \ 247 retl; \ 248 nop 249 250 /* 251 * Syscall return sequence, return code equal to rval2. 252 */ 253 #define RET2 \ 254 retl; \ 255 mov %o1, %o0 256 257 /* 258 * Syscall return sequence with return code forced to zero. 259 */ 260 #define RETC \ 261 retl; \ 262 clr %o0 263 264 #endif /* _LIBC_SPARC_INC_SYS_H */ 265