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. The 55 * subcode goes in %r9, after all of the other arguments. 56 */ 57#define DOOR_SYSCALL(name, code) \ 58 ENTRY(name); \ 59 movq $code, %r9; /* subcode */ \ 60 SYSTRAP_RVAL1(door); \ 61 SYSCERROR; \ 62 RET; \ 63 SET_SIZE(name) 64 65 DOOR_SYSCALL(__door_bind, DOOR_BIND) 66 DOOR_SYSCALL(__door_call, DOOR_CALL) 67 DOOR_SYSCALL(__door_create, DOOR_CREATE) 68 DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM) 69 DOOR_SYSCALL(__door_info, DOOR_INFO) 70 DOOR_SYSCALL(__door_revoke, DOOR_REVOKE) 71 DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM) 72 DOOR_SYSCALL(__door_ucred, DOOR_UCRED) 73 DOOR_SYSCALL(__door_unbind, DOOR_UNBIND) 74 DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS) 75 76/* 77 * int 78 * __door_return( 79 * void *data_ptr, 80 * size_t data_size, (in bytes) 81 * door_return_desc_t *door_ptr, (holds returned desc info) 82 * caddr_t stack_base, 83 * size_t stack_size) 84 */ 85 ENTRY(__door_return) 86 pushq %rbp 87 movq %rsp, %rbp 88 subq $0x8, %rsp 89 /* 90 * Save stack_base (arg4), since %rcx will be trashed if the syscall 91 * returns via sysret 92 */ 93 movq %rcx, -0x8(%rbp) 94 95door_restart: 96 movq $DOOR_RETURN, %r9 /* subcode */ 97 SYSTRAP_RVAL1(door) 98 jb 2f /* errno is set */ 99 /* 100 * On return, we're serving a door_call. Our stack looks like this: 101 * 102 * descriptors (if any) 103 * data (if any) 104 * sp-> struct door_results 105 */ 106 movl DOOR_SERVERS(%rsp), %eax 107 andl %eax, %eax /* test nservers */ 108 jg 1f 109 /* 110 * this is the last server thread - call creation func for more 111 */ 112 movq DOOR_INFO_PTR(%rsp), %rdi 113 call door_depletion_cb@PLT 1141: 115 /* Call the door server function now */ 116 movq DOOR_COOKIE(%rsp), %rdi 117 movq DOOR_DATA_PTR(%rsp), %rsi 118 movq DOOR_DATA_SIZE(%rsp), %rdx 119 movq DOOR_DESC_PTR(%rsp), %rcx 120 movq DOOR_DESC_SIZE(%rsp), %r8 121 movq DOOR_PC(%rsp), %rax 122 call *%rax 123 /* Exit the thread if we return here */ 124 movq $0, %rdi 125 call _thrp_terminate 126 /* NOTREACHED */ 1272: 128 /* 129 * Error during door_return call. Repark the thread in the kernel if 130 * the error code is EINTR (or ERESTART) and this lwp is still part 131 * of the same process. 132 */ 133 cmpl $ERESTART, %eax /* ERESTART is same as EINTR */ 134 jne 3f 135 movl $EINTR, %eax 1363: 137 cmpl $EINTR, %eax /* interrupted while waiting? */ 138 jne 4f /* if not, return the error */ 139 140 call getpid /* get current process id */ 141 movq _daref_(door_create_pid), %rdx 142 movl 0(%rdx), %edx 143 cmpl %eax, %edx /* same process? */ 144 movl $EINTR, %eax /* if no, return EINTR (child of forkall) */ 145 jne 4f 146 147 movq $0, %rdi /* clear arguments and restart */ 148 movq $0, %rsi 149 movq $0, %rdx 150 movq -0x8(%rbp), %rcx /* Restore arg4 (stack_base) */ 151 jmp door_restart 152 1534: 154 leave 155 jmp __cerror 156 SET_SIZE(__door_return) 157