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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "door.s"
#include "SYS.h"
#include <sys/door.h>
/*
* weak aliases for public interfaces
*/
ANSI_PRAGMA_WEAK2(door_bind,__door_bind,function)
ANSI_PRAGMA_WEAK2(door_getparam,__door_getparam,function)
ANSI_PRAGMA_WEAK2(door_info,__door_info,function)
ANSI_PRAGMA_WEAK2(door_revoke,__door_revoke,function)
ANSI_PRAGMA_WEAK2(door_setparam,__door_setparam,function)
/*
* Offsets within struct door_results
*/
#define DOOR_COOKIE _MUL(0, CLONGSIZE)
#define DOOR_DATA_PTR _MUL(1, CLONGSIZE)
#define DOOR_DATA_SIZE _MUL(2, CLONGSIZE)
#define DOOR_DESC_PTR _MUL(3, CLONGSIZE)
#define DOOR_DESC_SIZE _MUL(4, CLONGSIZE)
#define DOOR_PC _MUL(5, CLONGSIZE)
#define DOOR_SERVERS _MUL(6, CLONGSIZE)
#define DOOR_INFO_PTR _MUL(7, CLONGSIZE)
/*
* All of the syscalls except door_return() follow the same pattern. The
* subcode goes in %r9, after all of the other arguments.
*/
#define DOOR_SYSCALL(name, code) \
ENTRY(name); \
movq $code, %r9; /* subcode */ \
SYSTRAP_RVAL1(door); \
SYSCERROR; \
RET; \
SET_SIZE(name)
DOOR_SYSCALL(__door_bind, DOOR_BIND)
DOOR_SYSCALL(__door_call, DOOR_CALL)
DOOR_SYSCALL(__door_create, DOOR_CREATE)
DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM)
DOOR_SYSCALL(__door_info, DOOR_INFO)
DOOR_SYSCALL(__door_revoke, DOOR_REVOKE)
DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM)
DOOR_SYSCALL(__door_ucred, DOOR_UCRED)
DOOR_SYSCALL(__door_unbind, DOOR_UNBIND)
DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS)
/*
* int
* __door_return(
* void *data_ptr,
* size_t data_size, (in bytes)
* door_return_desc_t *door_ptr, (holds returned desc info)
* caddr_t stack_base,
* size_t stack_size)
*/
ENTRY(__door_return)
pushq %rbp
movq %rsp, %rbp
subq $0x8, %rsp
/*
* Save stack_base (arg4), since %rcx will be trashed if the syscall
* returns via sysret
*/
movq %rcx, -0x8(%rbp)
door_restart:
movq $DOOR_RETURN, %r9 /* subcode */
SYSTRAP_RVAL1(door)
jb 2f /* errno is set */
/*
* On return, we're serving a door_call. Our stack looks like this:
*
* descriptors (if any)
* data (if any)
* sp-> struct door_results
*/
movl DOOR_SERVERS(%rsp), %eax
andl %eax, %eax /* test nservers */
jg 1f
/*
* this is the last server thread - call creation func for more
*/
movq DOOR_INFO_PTR(%rsp), %rdi
call door_depletion_cb@PLT
1:
/* Call the door server function now */
movq DOOR_COOKIE(%rsp), %rdi
movq DOOR_DATA_PTR(%rsp), %rsi
movq DOOR_DATA_SIZE(%rsp), %rdx
movq DOOR_DESC_PTR(%rsp), %rcx
movq DOOR_DESC_SIZE(%rsp), %r8
movq DOOR_PC(%rsp), %rax
call *%rax
/* Exit the thread if we return here */
movq $0, %rdi
call _thrp_terminate
/* NOTREACHED */
2:
/*
* Error during door_return call. Repark the thread in the kernel if
* the error code is EINTR (or ERESTART) and this lwp is still part
* of the same process.
*/
cmpl $ERESTART, %eax /* ERESTART is same as EINTR */
jne 3f
movl $EINTR, %eax
3:
cmpl $EINTR, %eax /* interrupted while waiting? */
jne 4f /* if not, return the error */
call getpid /* get current process id */
movq _daref_(door_create_pid), %rdx
movl 0(%rdx), %edx
cmpl %eax, %edx /* same process? */
movl $EINTR, %eax /* if no, return EINTR (child of forkall) */
jne 4f
movq $0, %rdi /* clear arguments and restart */
movq $0, %rsi
movq $0, %rdx
movq -0x8(%rbp), %rcx /* Restore arg4 (stack_base) */
jmp door_restart
4:
leave
jmp __cerror
SET_SIZE(__door_return)
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