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