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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 argument 6, which means we have to copy our
* arguments into a new bit of stack, large enough to include the
* subcode. We fill the unused positions with zeros.
*/
#define DOOR_SYSCALL(name, code, copy_args) \
ENTRY(name); \
pushl %ebp; \
movl %esp, %ebp; \
pushl $code; /* syscall subcode, arg 6 */ \
pushl $0; /* dummy arg 5 */ \
pushl $0; /* dummy arg 4 */ \
copy_args; /* args 1, 2, 3 */ \
pushl $0; /* dummy return PC */ \
SYSTRAP_RVAL1(door); \
jae 1f; \
addl $28, %esp; \
leave; \
jmp __cerror; \
1: \
addl $28, %esp; \
leave; \
ret; \
SET_SIZE(name)
#define COPY_0 \
pushl $0; /* dummy */ \
pushl $0; /* dummy */ \
pushl $0 /* dummy */
#define COPY_1 \
pushl $0; /* dummy */ \
pushl $0; /* dummy */ \
pushl 8(%ebp) /* 1 */
#define COPY_2 \
pushl $0; /* dummy */ \
pushl 12(%ebp); /* 2 */ \
pushl 8(%ebp) /* 1 */
#define COPY_3 \
pushl 16(%ebp); /* 3 */ \
pushl 12(%ebp); /* 2 */ \
pushl 8(%ebp) /* 1 */
DOOR_SYSCALL(__door_bind, DOOR_BIND, COPY_1)
DOOR_SYSCALL(__door_call, DOOR_CALL, COPY_2)
DOOR_SYSCALL(__door_create, DOOR_CREATE, COPY_3)
DOOR_SYSCALL(__door_getparam, DOOR_GETPARAM, COPY_3)
DOOR_SYSCALL(__door_info, DOOR_INFO, COPY_2)
DOOR_SYSCALL(__door_revoke, DOOR_REVOKE, COPY_1)
DOOR_SYSCALL(__door_setparam, DOOR_SETPARAM, COPY_3)
DOOR_SYSCALL(__door_ucred, DOOR_UCRED, COPY_1)
DOOR_SYSCALL(__door_unbind, DOOR_UNBIND, COPY_0)
DOOR_SYSCALL(__door_unref, DOOR_UNREFSYS, COPY_0)
/*
* 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)
movl %esp, %edx / Save pointer to args
pushl %edi / save old %edi and %esi
pushl %esi / and use them to hold the
movl 16(%edx), %esi / stack pointer and
movl 20(%edx), %edi / size.
pushl $DOOR_RETURN / syscall subcode
pushl %edi / size of user stack
pushl %esi / base of user stack
pushl 12(%edx) / desc arguments ptr
pushl 8(%edx) / data size
pushl 4(%edx) / data ptr
pushl 0(%edx) / dummy return PC
door_restart:
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
*
* struct door_results has the arguments in place for the server proc,
* so we just call it directly.
*/
movl DOOR_SERVERS(%esp), %eax
andl %eax, %eax /* test nservers */
jg 1f
/*
* this is the last server thread - call creation func for more
*/
movl DOOR_INFO_PTR(%esp), %eax
pushl %eax /* door_info_t * */
call door_depletion_cb@PLT
addl $4, %esp
1:
/* Call the door server function now */
movl DOOR_PC(%esp), %eax
call *%eax
/* Exit the thread if we return here */
pushl $0
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.
*
* If the error code is EINTR or ERESTART, our stack may have been
* corrupted by a partial door call, so we refresh the system call
* arguments.
*/
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 */
_prologue_
call getpid
movl _daref_(door_create_pid), %edx
movl 0(%edx), %edx
_epilogue_
cmpl %eax, %edx /* same process? */
movl $EINTR, %eax /* if no, return EINTR (child of forkall) */
jne 4f
movl $0, 4(%esp) /* clear arguments and restart */
movl $0, 8(%esp)
movl $0, 12(%esp)
movl %esi, 16(%esp) /* refresh sp */
movl %edi, 20(%esp) /* refresh ssize */
movl $DOOR_RETURN, 24(%esp) /* refresh syscall subcode */
jmp door_restart
4:
/* Something bad happened during the door_return */
addl $28, %esp
popl %esi
popl %edi
jmp __cerror
SET_SIZE(__door_return)
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