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 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. The 56 * subcode goes in %r9, after all of the other arguments. 57 */ 58#define DOOR_SYSCALL(name, code) \ 59 ENTRY(name); \ 60 movq $code, %r9; /* subcode */ \ 61 SYSTRAP_RVAL1(door); \ 62 SYSCERROR; \ 63 RET; \ 64 SET_SIZE(name) 65 66 DOOR_SYSCALL(__door_bind, DOOR_BIND) 67 DOOR_SYSCALL(__door_call, DOOR_CALL) 68 DOOR_SYSCALL(__door_create, DOOR_CREATE) 69 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM) 70 DOOR_SYSCALL(__door_info, DOOR_INFO) 71 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE) 72 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM) 73 DOOR_SYSCALL(__door_ucred, DOOR_UCRED) 74 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND) 75 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS) 76 77/* 78 * int 79 * __door_return( 80 * void *data_ptr, 81 * size_t data_size, (in bytes) 82 * door_return_desc_t *door_ptr, (holds returned desc info) 83 * caddr_t stack_base, 84 * size_t stack_size) 85 */ 86 ENTRY(__door_return) 87 pushq %rbp 88 movq %rsp, %rbp 89 subq $0x8, %rsp 90 /* 91 * Save stack_base (arg4), since %rcx will be trashed if the syscall 92 * returns via sysret 93 */ 94 movq %rcx, -0x8(%rbp) 95 96door_restart: 97 movq $DOOR_RETURN, %r9 /* subcode */ 98 SYSTRAP_RVAL1(door) 99 jb 2f /* errno is set */ 100 /* 101 * On return, we're serving a door_call. Our stack looks like this: 102 * 103 * descriptors (if any) 104 * data (if any) 105 * sp-> struct door_results 106 */ 107 movl DOOR_SERVERS(%rsp), %eax 108 andl %eax, %eax /* test nservers */ 109 jg 1f 110 /* 111 * this is the last server thread - call creation func for more 112 */ 113 movq _daref_(door_server_func), %rax 114 movq 0(%rax), %rax 115 movq DOOR_INFO_PTR(%rsp), %rdi 116 call *%rax /* call create function */ 1171: 118 /* Call the door server function now */ 119 movq DOOR_COOKIE(%rsp), %rdi 120 movq DOOR_DATA_PTR(%rsp), %rsi 121 movq DOOR_DATA_SIZE(%rsp), %rdx 122 movq DOOR_DESC_PTR(%rsp), %rcx 123 movq DOOR_DESC_SIZE(%rsp), %r8 124 movq DOOR_PC(%rsp), %rax 125 call *%rax 126 /* Exit the thread if we return here */ 127 movq $0, %rdi 128 call _thrp_terminate 129 /* NOTREACHED */ 1302: 131 /* 132 * Error during door_return call. Repark the thread in the kernel if 133 * the error code is EINTR (or ERESTART) and this lwp is still part 134 * of the same process. 135 */ 136 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 137 jne 3f 138 movl $EINTR, %eax 1393: 140 cmpl $EINTR, %eax /* interrupted while waiting? */ 141 jne 4f /* if not, return the error */ 142 143 call getpid /* get current process id */ 144 movq _daref_(door_create_pid), %rdx 145 movl 0(%rdx), %edx 146 cmpl %eax, %edx /* same process? */ 147 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 148 jne 4f 149 150 movq $0, %rdi /* clear arguments and restart */ 151 movq $0, %rsi 152 movq $0, %rdx 153 movq -0x8(%rbp), %rcx /* Restore arg4 (stack_base) */ 154 jmp door_restart 155 1564: 157 leave 158 jmp __cerror 159 SET_SIZE(__door_return) 160