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 .file "door.s" 28 29#include "SYS.h" 30#include <sys/door.h> 31 32 /* 33 * weak aliases for public interfaces 34 */ 35 ANSI_PRAGMA_WEAK2(door_bind,__door_bind,function) 36 ANSI_PRAGMA_WEAK2(door_getparam,__door_getparam,function) 37 ANSI_PRAGMA_WEAK2(door_info,__door_info,function) 38 ANSI_PRAGMA_WEAK2(door_revoke,__door_revoke,function) 39 ANSI_PRAGMA_WEAK2(door_setparam,__door_setparam,function) 40 ANSI_PRAGMA_WEAK2(door_unbind,__door_unbind,function) 41 42/* 43 * Offsets within struct door_results 44 */ 45#define DOOR_COOKIE _MUL(0, CLONGSIZE) 46#define DOOR_DATA_PTR _MUL(1, CLONGSIZE) 47#define DOOR_DATA_SIZE _MUL(2, CLONGSIZE) 48#define DOOR_DESC_PTR _MUL(3, CLONGSIZE) 49#define DOOR_DESC_SIZE _MUL(4, CLONGSIZE) 50#define DOOR_PC _MUL(5, CLONGSIZE) 51#define DOOR_SERVERS _MUL(6, CLONGSIZE) 52#define DOOR_INFO_PTR _MUL(7, CLONGSIZE) 53 54/* 55 * All of the syscalls except door_return() follow the same pattern. 56 * The subcode goes in argument 6, which means we have to copy our 57 * arguments into a new bit of stack, large enough to include the 58 * subcode. We fill the unused positions with zeros. 59 */ 60#define DOOR_SYSCALL(name, code, copy_args) \ 61 ENTRY(name); \ 62 pushl %ebp; \ 63 movl %esp, %ebp; \ 64 pushl $code; /* syscall subcode, arg 6 */ \ 65 pushl $0; /* dummy arg 5 */ \ 66 pushl $0; /* dummy arg 4 */ \ 67 copy_args; /* args 1, 2, 3 */ \ 68 pushl $0; /* dummy return PC */ \ 69 SYSTRAP_RVAL1(door); \ 70 jae 1f; \ 71 addl $28, %esp; \ 72 leave; \ 73 jmp __cerror; \ 741: \ 75 addl $28, %esp; \ 76 leave; \ 77 ret; \ 78 SET_SIZE(name) 79 80#define COPY_0 \ 81 pushl $0; /* dummy */ \ 82 pushl $0; /* dummy */ \ 83 pushl $0 /* dummy */ 84 85#define COPY_1 \ 86 pushl $0; /* dummy */ \ 87 pushl $0; /* dummy */ \ 88 pushl 8(%ebp) /* 1 */ 89 90#define COPY_2 \ 91 pushl $0; /* dummy */ \ 92 pushl 12(%ebp); /* 2 */ \ 93 pushl 8(%ebp) /* 1 */ 94 95#define COPY_3 \ 96 pushl 16(%ebp); /* 3 */ \ 97 pushl 12(%ebp); /* 2 */ \ 98 pushl 8(%ebp) /* 1 */ 99 100 DOOR_SYSCALL(__door_bind, DOOR_BIND, COPY_1) 101 DOOR_SYSCALL(__door_call, DOOR_CALL, COPY_2) 102 DOOR_SYSCALL(__door_create, DOOR_CREATE, COPY_3) 103 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM, COPY_3) 104 DOOR_SYSCALL(__door_info, DOOR_INFO, COPY_2) 105 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE, COPY_1) 106 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM, COPY_3) 107 DOOR_SYSCALL(__door_ucred, DOOR_UCRED, COPY_1) 108 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND, COPY_0) 109 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS, COPY_0) 110 111/* 112 * int 113 * __door_return( 114 * void *data_ptr, 115 * size_t data_size, (in bytes) 116 * door_return_desc_t *door_ptr, (holds returned desc info) 117 * caddr_t stack_base, 118 * size_t stack_size) 119 */ 120 ENTRY(__door_return) 121 movl %esp, %edx / Save pointer to args 122 123 pushl %edi / save old %edi and %esi 124 pushl %esi / and use them to hold the 125 movl 16(%edx), %esi / stack pointer and 126 movl 20(%edx), %edi / size. 127 128 pushl $DOOR_RETURN / syscall subcode 129 pushl %edi / size of user stack 130 pushl %esi / base of user stack 131 pushl 12(%edx) / desc arguments ptr 132 pushl 8(%edx) / data size 133 pushl 4(%edx) / data ptr 134 pushl 0(%edx) / dummy return PC 135 136door_restart: 137 SYSTRAP_RVAL1(door) 138 jb 2f /* errno is set */ 139 /* 140 * On return, we're serving a door_call. Our stack looks like this: 141 * 142 * descriptors (if any) 143 * data (if any) 144 * sp-> struct door_results 145 * 146 * struct door_results has the arguments in place for the server proc, 147 * so we just call it directly. 148 */ 149 movl DOOR_SERVERS(%esp), %eax 150 andl %eax, %eax /* test nservers */ 151 jg 1f 152 /* 153 * this is the last server thread - call creation func for more 154 */ 155 movl DOOR_INFO_PTR(%esp), %eax 156 _prologue_ 157 pushl %eax /* door_info_t * */ 158 movl _daref_(door_server_func), %eax 159 movl 0(%eax), %eax 160 call *%eax /* call create function */ 161 addl $4, %esp 162 _epilogue_ 1631: 164 /* Call the door server function now */ 165 movl DOOR_PC(%esp), %eax 166 call *%eax 167 /* Exit the thread if we return here */ 168 pushl $0 169 call _thrp_terminate 170 /* NOTREACHED */ 1712: 172 /* 173 * Error during door_return call. Repark the thread in the kernel if 174 * the error code is EINTR (or ERESTART) and this lwp is still part 175 * of the same process. 176 * 177 * If the error code is EINTR or ERESTART, our stack may have been 178 * corrupted by a partial door call, so we refresh the system call 179 * arguments. 180 */ 181 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 182 jne 3f 183 movl $EINTR, %eax 1843: 185 cmpl $EINTR, %eax /* interrupted while waiting? */ 186 jne 4f /* if not, return the error */ 187 _prologue_ 188 call getpid 189 movl _daref_(door_create_pid), %edx 190 movl 0(%edx), %edx 191 _epilogue_ 192 cmpl %eax, %edx /* same process? */ 193 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 194 jne 4f 195 196 movl $0, 4(%esp) /* clear arguments and restart */ 197 movl $0, 8(%esp) 198 movl $0, 12(%esp) 199 movl %esi, 16(%esp) /* refresh sp */ 200 movl %edi, 20(%esp) /* refresh ssize */ 201 movl $DOOR_RETURN, 24(%esp) /* refresh syscall subcode */ 202 jmp door_restart 2034: 204 /* Something bad happened during the door_return */ 205 addl $28, %esp 206 popl %esi 207 popl %edi 208 jmp __cerror 209 SET_SIZE(__door_return) 210