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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26#pragma ident "%Z%%M% %I% %E% SMI" 27 28 .file "%M%" 29 30#include <sys/asm_linkage.h> 31 32 /* 33 * weak aliases for public interfaces 34 */ 35 ANSI_PRAGMA_WEAK(_door_bind,function) 36 ANSI_PRAGMA_WEAK(_door_call,function) 37 ANSI_PRAGMA_WEAK(_door_getparam,function) 38 ANSI_PRAGMA_WEAK(_door_info,function) 39 ANSI_PRAGMA_WEAK(_door_revoke,function) 40 ANSI_PRAGMA_WEAK(_door_setparam,function) 41 ANSI_PRAGMA_WEAK(_door_unbind,function) 42 43 ANSI_PRAGMA_WEAK(door_bind,function) 44 ANSI_PRAGMA_WEAK(door_call,function) 45 ANSI_PRAGMA_WEAK(door_getparam,function) 46 ANSI_PRAGMA_WEAK(door_info,function) 47 ANSI_PRAGMA_WEAK(door_revoke,function) 48 ANSI_PRAGMA_WEAK(door_setparam,function) 49 ANSI_PRAGMA_WEAK(door_unbind,function) 50 51#include <sys/door.h> 52#include "SYS.h" 53 54/* 55 * Offsets within struct door_results 56 */ 57#define DOOR_COOKIE _MUL(0, CLONGSIZE) 58#define DOOR_DATA_PTR _MUL(1, CLONGSIZE) 59#define DOOR_DATA_SIZE _MUL(2, CLONGSIZE) 60#define DOOR_DESC_PTR _MUL(3, CLONGSIZE) 61#define DOOR_DESC_SIZE _MUL(4, CLONGSIZE) 62#define DOOR_PC _MUL(5, CLONGSIZE) 63#define DOOR_SERVERS _MUL(6, CLONGSIZE) 64#define DOOR_INFO_PTR _MUL(7, CLONGSIZE) 65 66/* 67 * All of the syscalls except door_return() follow the same pattern. 68 * The subcode goes in argument 6, which means we have to copy our 69 * arguments into a new bit of stack, large enough to include the 70 * subcode. We fill the unused positions with zeros. 71 */ 72#define DOOR_SYSCALL(name, code, copy_args) \ 73 ENTRY(name); \ 74 pushl %ebp; \ 75 movl %esp, %ebp; \ 76 pushl $code; /* syscall subcode, arg 6 */ \ 77 pushl $0; /* dummy arg 5 */ \ 78 pushl $0; /* dummy arg 4 */ \ 79 copy_args; /* args 1, 2, 3 */ \ 80 pushl $0; /* dummy return PC */ \ 81 SYSTRAP_RVAL1(door); \ 82 jae 1f; \ 83 addl $28, %esp; \ 84 leave; \ 85 jmp __cerror; \ 861: \ 87 addl $28, %esp; \ 88 leave; \ 89 ret; \ 90 SET_SIZE(name) 91 92#define COPY_0 \ 93 pushl $0; /* dummy */ \ 94 pushl $0; /* dummy */ \ 95 pushl $0 /* dummy */ 96 97#define COPY_1 \ 98 pushl $0; /* dummy */ \ 99 pushl $0; /* dummy */ \ 100 pushl 8(%ebp) /* 1 */ 101 102#define COPY_2 \ 103 pushl $0; /* dummy */ \ 104 pushl 12(%ebp); /* 2 */ \ 105 pushl 8(%ebp) /* 1 */ 106 107#define COPY_3 \ 108 pushl 16(%ebp); /* 3 */ \ 109 pushl 12(%ebp); /* 2 */ \ 110 pushl 8(%ebp) /* 1 */ 111 112 DOOR_SYSCALL(__door_bind, DOOR_BIND, COPY_1) 113 DOOR_SYSCALL(__door_call, DOOR_CALL, COPY_2) 114 DOOR_SYSCALL(__door_create, DOOR_CREATE, COPY_3) 115 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM, COPY_3) 116 DOOR_SYSCALL(__door_info, DOOR_INFO, COPY_2) 117 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE, COPY_1) 118 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM, COPY_3) 119 DOOR_SYSCALL(__door_ucred, DOOR_UCRED, COPY_1) 120 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND, COPY_0) 121 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS, COPY_0) 122 123/* 124 * int 125 * __door_return( 126 * void *data_ptr, 127 * size_t data_size, (in bytes) 128 * door_return_desc_t *door_ptr, (holds returned desc info) 129 * caddr_t stack_base, 130 * size_t stack_size) 131 */ 132 ENTRY(__door_return) 133 movl %esp, %edx / Save pointer to args 134 135 pushl %edi / save old %edi and %esi 136 pushl %esi / and use them to hold the 137 movl 16(%edx), %esi / stack pointer and 138 movl 20(%edx), %edi / size. 139 140 pushl $DOOR_RETURN / syscall subcode 141 pushl %edi / size of user stack 142 pushl %esi / base of user stack 143 pushl 12(%edx) / desc arguments ptr 144 pushl 8(%edx) / data size 145 pushl 4(%edx) / data ptr 146 pushl 0(%edx) / dummy return PC 147 148door_restart: 149 SYSTRAP_RVAL1(door) 150 jb 3f /* errno is set */ 151 /* 152 * On return, we're serving a door_call. Our stack looks like this: 153 * 154 * descriptors (if any) 155 * data (if any) 156 * sp-> struct door_results 157 * 158 * struct door_results has the arguments in place for the server proc, 159 * so we just call it directly. 160 */ 161 movl DOOR_SERVERS(%esp), %eax 162 andl %eax, %eax /* test nservers */ 163 jg 1f 164 /* 165 * this is the last server thread - call creation func for more 166 */ 167 movl DOOR_INFO_PTR(%esp), %eax 168 _prologue_ 169 pushl %eax /* door_info_t * */ 170 movl _daref_(door_server_func), %eax 171 movl 0(%eax), %eax 172 call *%eax /* call create function */ 173 addl $4, %esp 174 _epilogue_ 1751: 176 /* Call the door server function now */ 177 movl DOOR_PC(%esp), %eax 178 call *%eax 179 1802: 181 /* Exit the thread if we return here */ 182 pushl $0 183 call _thr_terminate 184 /* NOTREACHED */ 1853: 186 /* 187 * Error during door_return call. Repark the thread in the kernel if 188 * the error code is EINTR (or ERESTART) and this lwp is still part 189 * of the same process. 190 * 191 * If the error code is EINTR or ERESTART, our stack may have been 192 * corrupted by a partial door call, so we refresh the system call 193 * arguments. 194 */ 195 cmpl $EEXIST, %eax /* exit this thread if EEXIST */ 196 je 2b 197 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 198 jne 4f 199 movl $EINTR, %eax 2004: 201 cmpl $EINTR, %eax /* interrupted while waiting? */ 202 jne 5f /* if not, return the error */ 203 _prologue_ 204 call _private_getpid /* get current process id */ 205 movl _daref_(door_create_pid), %edx 206 movl 0(%edx), %edx 207 _epilogue_ 208 cmpl %eax, %edx /* same process? */ 209 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 210 jne 5f 211 212 movl $0, 4(%esp) /* clear arguments and restart */ 213 movl $0, 8(%esp) 214 movl $0, 12(%esp) 215 movl %esi, 16(%esp) /* refresh sp */ 216 movl %edi, 20(%esp) /* refresh ssize */ 217 movl $DOOR_RETURN, 24(%esp) /* refresh syscall subcode */ 218 jmp door_restart 2195: 220 /* Something bad happened during the door_return */ 221 addl $28, %esp 222 popl %esi 223 popl %edi 224 jmp __cerror 225 SET_SIZE(__door_return) 226