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 * Copyright 2021 Tintri by DDN, Inc. All rights reserved. 27 */ 28 29 .file "door.s" 30 31#include "SYS.h" 32#include <sys/door.h> 33 34 /* 35 * weak aliases for public interfaces 36 */ 37 ANSI_PRAGMA_WEAK2(door_bind,__door_bind,function) 38 ANSI_PRAGMA_WEAK2(door_getparam,__door_getparam,function) 39 ANSI_PRAGMA_WEAK2(door_info,__door_info,function) 40 ANSI_PRAGMA_WEAK2(door_revoke,__door_revoke,function) 41 ANSI_PRAGMA_WEAK2(door_setparam,__door_setparam,function) 42 43/* 44 * Offsets within struct door_results 45 */ 46#define DOOR_COOKIE _MUL(0, CLONGSIZE) 47#define DOOR_DATA_PTR _MUL(1, CLONGSIZE) 48#define DOOR_DATA_SIZE _MUL(2, CLONGSIZE) 49#define DOOR_DESC_PTR _MUL(3, CLONGSIZE) 50#define DOOR_DESC_SIZE _MUL(4, CLONGSIZE) 51#define DOOR_PC _MUL(5, CLONGSIZE) 52#define DOOR_SERVERS _MUL(6, CLONGSIZE) 53#define DOOR_INFO_PTR _MUL(7, CLONGSIZE) 54 55/* 56 * All of the syscalls except door_return() follow the same pattern. 57 * The subcode goes in argument 6, which means we have to copy our 58 * arguments into a new bit of stack, large enough to include the 59 * subcode. We fill the unused positions with zeros. 60 */ 61#define DOOR_SYSCALL(name, code, copy_args) \ 62 ENTRY(name); \ 63 pushl %ebp; \ 64 movl %esp, %ebp; \ 65 pushl $code; /* syscall subcode, arg 6 */ \ 66 pushl $0; /* dummy arg 5 */ \ 67 pushl $0; /* dummy arg 4 */ \ 68 copy_args; /* args 1, 2, 3 */ \ 69 pushl $0; /* dummy return PC */ \ 70 SYSTRAP_RVAL1(door); \ 71 jae 1f; \ 72 addl $28, %esp; \ 73 leave; \ 74 jmp __cerror; \ 751: \ 76 addl $28, %esp; \ 77 leave; \ 78 ret; \ 79 SET_SIZE(name) 80 81#define COPY_0 \ 82 pushl $0; /* dummy */ \ 83 pushl $0; /* dummy */ \ 84 pushl $0 /* dummy */ 85 86#define COPY_1 \ 87 pushl $0; /* dummy */ \ 88 pushl $0; /* dummy */ \ 89 pushl 8(%ebp) /* 1 */ 90 91#define COPY_2 \ 92 pushl $0; /* dummy */ \ 93 pushl 12(%ebp); /* 2 */ \ 94 pushl 8(%ebp) /* 1 */ 95 96#define COPY_3 \ 97 pushl 16(%ebp); /* 3 */ \ 98 pushl 12(%ebp); /* 2 */ \ 99 pushl 8(%ebp) /* 1 */ 100 101 DOOR_SYSCALL(__door_bind, DOOR_BIND, COPY_1) 102 DOOR_SYSCALL(__door_call, DOOR_CALL, COPY_2) 103 DOOR_SYSCALL(__door_create, DOOR_CREATE, COPY_3) 104 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM, COPY_3) 105 DOOR_SYSCALL(__door_info, DOOR_INFO, COPY_2) 106 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE, COPY_1) 107 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM, COPY_3) 108 DOOR_SYSCALL(__door_ucred, DOOR_UCRED, COPY_1) 109 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND, COPY_0) 110 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS, COPY_0) 111 112/* 113 * int 114 * __door_return( 115 * void *data_ptr, 116 * size_t data_size, (in bytes) 117 * door_return_desc_t *door_ptr, (holds returned desc info) 118 * caddr_t stack_base, 119 * size_t stack_size) 120 */ 121 ENTRY(__door_return) 122 movl %esp, %edx / Save pointer to args 123 124 pushl %edi / save old %edi and %esi 125 pushl %esi / and use them to hold the 126 movl 16(%edx), %esi / stack pointer and 127 movl 20(%edx), %edi / size. 128 129 pushl $DOOR_RETURN / syscall subcode 130 pushl %edi / size of user stack 131 pushl %esi / base of user stack 132 pushl 12(%edx) / desc arguments ptr 133 pushl 8(%edx) / data size 134 pushl 4(%edx) / data ptr 135 pushl 0(%edx) / dummy return PC 136 137door_restart: 138 SYSTRAP_RVAL1(door) 139 jb 2f /* errno is set */ 140 /* 141 * On return, we're serving a door_call. Our stack looks like this: 142 * 143 * descriptors (if any) 144 * data (if any) 145 * sp-> struct door_results 146 * 147 * The stack will be aligned to 16 bytes; we must maintain that 148 * alignment prior to any call instruction. 149 * struct door_results has the arguments in place for the server proc, 150 * so we just call it directly. 151 */ 152 movl DOOR_SERVERS(%esp), %eax 153 andl %eax, %eax /* test nservers */ 154 jg 1f 155 /* 156 * this is the last server thread - call creation func for more 157 */ 158 movl DOOR_INFO_PTR(%esp), %eax 159 subl $12, %esp 160 pushl %eax /* door_info_t * */ 161 call door_depletion_cb@PLT 162 addl $16, %esp 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 subl $12, %esp 169 pushl $0 170 call _thrp_terminate 171 /* NOTREACHED */ 1722: 173 /* 174 * Error during door_return call. Repark the thread in the kernel if 175 * the error code is EINTR (or ERESTART) and this lwp is still part 176 * of the same process. 177 * 178 * If the error code is EINTR or ERESTART, our stack may have been 179 * corrupted by a partial door call, so we refresh the system call 180 * arguments. 181 */ 182 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 183 jne 3f 184 movl $EINTR, %eax 1853: 186 cmpl $EINTR, %eax /* interrupted while waiting? */ 187 jne 4f /* if not, return the error */ 188 _prologue_ 189 call getpid 190 movl _daref_(door_create_pid), %edx 191 movl 0(%edx), %edx 192 _epilogue_ 193 cmpl %eax, %edx /* same process? */ 194 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 195 jne 4f 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