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 2009 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 41/* 42 * Offsets within struct door_results 43 */ 44#define DOOR_COOKIE _MUL(0, CLONGSIZE) 45#define DOOR_DATA_PTR _MUL(1, CLONGSIZE) 46#define DOOR_DATA_SIZE _MUL(2, CLONGSIZE) 47#define DOOR_DESC_PTR _MUL(3, CLONGSIZE) 48#define DOOR_DESC_SIZE _MUL(4, CLONGSIZE) 49#define DOOR_PC _MUL(5, CLONGSIZE) 50#define DOOR_SERVERS _MUL(6, CLONGSIZE) 51#define DOOR_INFO_PTR _MUL(7, CLONGSIZE) 52 53/* 54 * All of the syscalls except door_return() follow the same pattern. 55 * The subcode goes in argument 6, which means we have to copy our 56 * arguments into a new bit of stack, large enough to include the 57 * subcode. We fill the unused positions with zeros. 58 */ 59#define DOOR_SYSCALL(name, code, copy_args) \ 60 ENTRY(name); \ 61 pushl %ebp; \ 62 movl %esp, %ebp; \ 63 pushl $code; /* syscall subcode, arg 6 */ \ 64 pushl $0; /* dummy arg 5 */ \ 65 pushl $0; /* dummy arg 4 */ \ 66 copy_args; /* args 1, 2, 3 */ \ 67 pushl $0; /* dummy return PC */ \ 68 SYSTRAP_RVAL1(door); \ 69 jae 1f; \ 70 addl $28, %esp; \ 71 leave; \ 72 jmp __cerror; \ 731: \ 74 addl $28, %esp; \ 75 leave; \ 76 ret; \ 77 SET_SIZE(name) 78 79#define COPY_0 \ 80 pushl $0; /* dummy */ \ 81 pushl $0; /* dummy */ \ 82 pushl $0 /* dummy */ 83 84#define COPY_1 \ 85 pushl $0; /* dummy */ \ 86 pushl $0; /* dummy */ \ 87 pushl 8(%ebp) /* 1 */ 88 89#define COPY_2 \ 90 pushl $0; /* dummy */ \ 91 pushl 12(%ebp); /* 2 */ \ 92 pushl 8(%ebp) /* 1 */ 93 94#define COPY_3 \ 95 pushl 16(%ebp); /* 3 */ \ 96 pushl 12(%ebp); /* 2 */ \ 97 pushl 8(%ebp) /* 1 */ 98 99 DOOR_SYSCALL(__door_bind, DOOR_BIND, COPY_1) 100 DOOR_SYSCALL(__door_call, DOOR_CALL, COPY_2) 101 DOOR_SYSCALL(__door_create, DOOR_CREATE, COPY_3) 102 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM, COPY_3) 103 DOOR_SYSCALL(__door_info, DOOR_INFO, COPY_2) 104 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE, COPY_1) 105 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM, COPY_3) 106 DOOR_SYSCALL(__door_ucred, DOOR_UCRED, COPY_1) 107 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND, COPY_0) 108 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS, COPY_0) 109 110/* 111 * int 112 * __door_return( 113 * void *data_ptr, 114 * size_t data_size, (in bytes) 115 * door_return_desc_t *door_ptr, (holds returned desc info) 116 * caddr_t stack_base, 117 * size_t stack_size) 118 */ 119 ENTRY(__door_return) 120 movl %esp, %edx / Save pointer to args 121 122 pushl %edi / save old %edi and %esi 123 pushl %esi / and use them to hold the 124 movl 16(%edx), %esi / stack pointer and 125 movl 20(%edx), %edi / size. 126 127 pushl $DOOR_RETURN / syscall subcode 128 pushl %edi / size of user stack 129 pushl %esi / base of user stack 130 pushl 12(%edx) / desc arguments ptr 131 pushl 8(%edx) / data size 132 pushl 4(%edx) / data ptr 133 pushl 0(%edx) / dummy return PC 134 135door_restart: 136 SYSTRAP_RVAL1(door) 137 jb 2f /* errno is set */ 138 /* 139 * On return, we're serving a door_call. Our stack looks like this: 140 * 141 * descriptors (if any) 142 * data (if any) 143 * sp-> struct door_results 144 * 145 * struct door_results has the arguments in place for the server proc, 146 * so we just call it directly. 147 */ 148 movl DOOR_SERVERS(%esp), %eax 149 andl %eax, %eax /* test nservers */ 150 jg 1f 151 /* 152 * this is the last server thread - call creation func for more 153 */ 154 movl DOOR_INFO_PTR(%esp), %eax 155 pushl %eax /* door_info_t * */ 156 call door_depletion_cb@PLT 157 addl $4, %esp 1581: 159 /* Call the door server function now */ 160 movl DOOR_PC(%esp), %eax 161 call *%eax 162 /* Exit the thread if we return here */ 163 pushl $0 164 call _thrp_terminate 165 /* NOTREACHED */ 1662: 167 /* 168 * Error during door_return call. Repark the thread in the kernel if 169 * the error code is EINTR (or ERESTART) and this lwp is still part 170 * of the same process. 171 * 172 * If the error code is EINTR or ERESTART, our stack may have been 173 * corrupted by a partial door call, so we refresh the system call 174 * arguments. 175 */ 176 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 177 jne 3f 178 movl $EINTR, %eax 1793: 180 cmpl $EINTR, %eax /* interrupted while waiting? */ 181 jne 4f /* if not, return the error */ 182 _prologue_ 183 call getpid 184 movl _daref_(door_create_pid), %edx 185 movl 0(%edx), %edx 186 _epilogue_ 187 cmpl %eax, %edx /* same process? */ 188 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 189 jne 4f 190 movl $0, 4(%esp) /* clear arguments and restart */ 191 movl $0, 8(%esp) 192 movl $0, 12(%esp) 193 movl %esi, 16(%esp) /* refresh sp */ 194 movl %edi, 20(%esp) /* refresh ssize */ 195 movl $DOOR_RETURN, 24(%esp) /* refresh syscall subcode */ 196 jmp door_restart 1974: 198 /* Something bad happened during the door_return */ 199 addl $28, %esp 200 popl %esi 201 popl %edi 202 jmp __cerror 203 SET_SIZE(__door_return) 204