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_SPARCV9_INC_SYS_H 28 #define _LIBC_SPARCV9_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.) 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 64 60 61 /* 62 * Define the external symbol __cerror for all files. 63 */ 64 .global __cerror 65 66 /* 67 * __SYSTRAP provides the basic trap sequence. It assumes that an entry 68 * of the form SYS_name exists (probably from sys/syscall.h). 69 */ 70 #define __SYSTRAP(name) \ 71 /* CSTYLED */ \ 72 mov SYS_/**/name, %g1; \ 73 ta SYSCALL_TRAPNUM 74 75 #define SYSTRAP_RVAL1(name) __SYSTRAP(name) 76 #define SYSTRAP_RVAL2(name) __SYSTRAP(name) 77 #define SYSTRAP_2RVALS(name) __SYSTRAP(name) 78 #define SYSTRAP_64RVAL(name) __SYSTRAP(name) 79 80 /* 81 * SYSFASTTRAP provides the fast system call trap sequence. It assumes 82 * that an entry of the form ST_name exists (probably from sys/trap.h). 83 */ 84 #define SYSFASTTRAP(name) \ 85 /* CSTYLED */ \ 86 ta ST_/**/name 87 88 /* 89 * SYSCERROR provides the sequence to branch to __cerror if an error is 90 * indicated by the carry-bit being set upon return from a trap. 91 */ 92 #define SYSCERROR \ 93 /* CSTYLED */ \ 94 bcs __cerror; \ 95 nop 96 97 /* 98 * SYSLWPERR provides the sequence to return 0 on a successful trap 99 * and the error code if unsuccessful. 100 * Error is indicated by the carry-bit being set upon return from a trap. 101 */ 102 #define SYSLWPERR \ 103 /* CSTYLED */ \ 104 bcc,a,pt %icc, 1f; \ 105 clr %o0; \ 106 cmp %o0, ERESTART; \ 107 move %icc, EINTR, %o0; \ 108 1: 109 110 #define SAVE_OFFSET (STACK_BIAS + 8 * 16) 111 112 /* 113 * SYSREENTRY provides the entry sequence for restartable system calls. 114 */ 115 #define SYSREENTRY(name) \ 116 ENTRY(name); \ 117 stn %o0, [%sp + SAVE_OFFSET]; \ 118 /* CSTYLED */ \ 119 .restart_/**/name: 120 121 /* 122 * SYSRESTART provides the error handling sequence for restartable 123 * system calls. 124 */ 125 #define SYSRESTART(name) \ 126 /* CSTYLED */ \ 127 bcc,pt %icc, 1f; \ 128 cmp %o0, ERESTART; \ 129 /* CSTYLED */ \ 130 be,a,pn %icc, name; \ 131 ldn [%sp + SAVE_OFFSET], %o0; \ 132 /* CSTYLED */ \ 133 ba,a __cerror; \ 134 1: 135 136 /* 137 * SYSINTR_RESTART provides the error handling sequence for restartable 138 * system calls in case of EINTR or ERESTART. 139 */ 140 #define SYSINTR_RESTART(name) \ 141 /* CSTYLED */ \ 142 bcc,a,pt %icc, 1f; \ 143 clr %o0; \ 144 cmp %o0, ERESTART; \ 145 /* CSTYLED */ \ 146 be,a,pn %icc, name; \ 147 ldn [%sp + SAVE_OFFSET], %o0; \ 148 cmp %o0, EINTR; \ 149 /* CSTYLED */ \ 150 be,a,pn %icc, name; \ 151 ldn [%sp + SAVE_OFFSET], %o0; \ 152 1: 153 154 /* 155 * SYSCALL provides the standard (i.e.: most common) system call sequence. 156 */ 157 #define SYSCALL(name) \ 158 ENTRY(name); \ 159 SYSTRAP_2RVALS(name); \ 160 SYSCERROR 161 162 #define SYSCALL_RVAL1(name) \ 163 ENTRY(name); \ 164 SYSTRAP_RVAL1(name); \ 165 SYSCERROR 166 167 /* 168 * SYSCALL_RESTART provides the most common restartable system call sequence. 169 */ 170 #define SYSCALL_RESTART(name) \ 171 SYSREENTRY(name); \ 172 SYSTRAP_2RVALS(name); \ 173 /* CSTYLED */ \ 174 SYSRESTART(.restart_/**/name) 175 176 #define SYSCALL_RESTART_RVAL1(name) \ 177 SYSREENTRY(name); \ 178 SYSTRAP_RVAL1(name); \ 179 /* CSTYLED */ \ 180 SYSRESTART(.restart_/**/name) 181 182 /* 183 * SYSCALL2 provides a common system call sequence when the entry name 184 * is different than the trap name. 185 */ 186 #define SYSCALL2(entryname, trapname) \ 187 ENTRY(entryname); \ 188 SYSTRAP_2RVALS(trapname); \ 189 SYSCERROR 190 191 #define SYSCALL2_RVAL1(entryname, trapname) \ 192 ENTRY(entryname); \ 193 SYSTRAP_RVAL1(trapname); \ 194 SYSCERROR 195 196 /* 197 * SYSCALL2_RESTART provides a common restartable system call sequence when the 198 * entry name is different than the trap name. 199 */ 200 #define SYSCALL2_RESTART(entryname, trapname) \ 201 SYSREENTRY(entryname); \ 202 SYSTRAP_2RVALS(trapname); \ 203 /* CSTYLED */ \ 204 SYSRESTART(.restart_/**/entryname) 205 206 #define SYSCALL2_RESTART_RVAL1(entryname, trapname) \ 207 SYSREENTRY(entryname); \ 208 SYSTRAP_RVAL1(trapname); \ 209 /* CSTYLED */ \ 210 SYSRESTART(.restart_/**/entryname) 211 212 /* 213 * SYSCALL_NOERROR provides the most common system call sequence for those 214 * system calls which don't check the error return (carry bit). 215 */ 216 #define SYSCALL_NOERROR(name) \ 217 ENTRY(name); \ 218 SYSTRAP_2RVALS(name) 219 220 #define SYSCALL_NOERROR_RVAL1(name) \ 221 ENTRY(name); \ 222 SYSTRAP_RVAL1(name) 223 224 /* 225 * Standard syscall return sequence, return code equal to rval1. 226 */ 227 #define RET \ 228 retl; \ 229 nop 230 231 /* 232 * Syscall return sequence, return code equal to rval2. 233 */ 234 #define RET2 \ 235 retl; \ 236 mov %o1, %o0 237 238 /* 239 * Syscall return sequence with return code forced to zero. 240 */ 241 #define RETC \ 242 retl; \ 243 clr %o0 244 245 #endif /* _LIBC_SPARCV9_INC_SYS_H */ 246