xref: /titanic_44/usr/src/lib/libc/sparc/sys/door.s (revision a60349c89adffc0902b2353230891d8e7f2b24d9)
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	(SA(MINFRAME) + STACK_BIAS + 0*CLONGSIZE)
45#define	DOOR_DATA_PTR	(SA(MINFRAME) + STACK_BIAS + 1*CLONGSIZE)
46#define	DOOR_DATA_SIZE	(SA(MINFRAME) + STACK_BIAS + 2*CLONGSIZE)
47#define	DOOR_DESC_PTR	(SA(MINFRAME) + STACK_BIAS + 3*CLONGSIZE)
48#define	DOOR_DESC_SIZE	(SA(MINFRAME) + STACK_BIAS + 4*CLONGSIZE)
49#define	DOOR_PC		(SA(MINFRAME) + STACK_BIAS + 5*CLONGSIZE)
50#define	DOOR_SERVERS	(SA(MINFRAME) + STACK_BIAS + 6*CLONGSIZE)
51#define	DOOR_INFO_PTR	(SA(MINFRAME) + STACK_BIAS + 7*CLONGSIZE)
52
53/*
54 * All of the syscalls except door_return() follow the same pattern.  The
55 * subcode goes in %o5, after all of the other arguments.
56 */
57#define	DOOR_SYSCALL(name, code)					\
58	ENTRY(name);							\
59	mov	code, %o5;		/* 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)
86door_restart:
87	mov	DOOR_RETURN, %o5	/* subcode */
88	SYSTRAP_RVAL1(door)
89	bcs,pn	%icc, 2f			/* errno is set */
90	ld	[%sp + DOOR_SERVERS], %g1	/* (delay) load nservers */
91	/*
92	 * On return, we're serving a door_call.  Our stack looks like this:
93	 *
94	 *		descriptors (if any)
95	 *		data (if any)
96	 *		struct door_results
97	 *		MINFRAME
98	 *	sp ->
99	 */
100	tst	%g1				/* test nservers */
101	bg	1f				/* everything looks o.k. */
102	ldn	[%sp + DOOR_COOKIE], %o0	/* (delay) load cookie */
103	/*
104	 * this is the last server thread - call creation func for more
105	 */
106	save	%sp, -SA(MINFRAME), %sp
107	call	door_depletion_cb
108	ldn	[%fp + DOOR_INFO_PTR], %o0	/* (delay) load door_info ptr */
109	restore
1101:
111	/* Call the door server function now */
112	ldn	[%sp + DOOR_DATA_PTR], %o1
113	ldn	[%sp + DOOR_DATA_SIZE], %o2
114	ldn	[%sp + DOOR_DESC_PTR], %o3
115	ldn	[%sp + DOOR_PC], %g1
116	jmpl	%g1, %o7
117	ldn	[%sp + DOOR_DESC_SIZE], %o4
118
119	/* Exit the thread if we return here */
120	call	_thrp_terminate
121	mov	%g0, %o0
122	/* NOTREACHED */
1232:
124	/*
125	 * Error during door_return call.  Repark the thread in the kernel if
126	 * the error code is EINTR (or ERESTART) and this lwp is still part
127	 * of the same process.
128	 */
129	cmp	%o0, ERESTART		/* ERESTART is same as EINTR */
130	be,a	3f
131	mov	EINTR, %o0
1323:
133	cmp	%o0, EINTR		/* interrupted while waiting? */
134	bne	__cerror		/* if not, return the error */
135	nop
136
137	save	%sp, -SA(MINFRAME), %sp
138	call	getpid
139	nop
140	PIC_SETUP(g1)
141#ifdef __sparcv9
142	sethi	%hi(door_create_pid), %g5
143	or	%g5, %lo(door_create_pid), %g5
144	ldn	[%g1 + %g5], %g1
145#else
146	ldn	[%g1 + door_create_pid], %g1
147#endif
148	ld	[%g1], %g1
149	cmp	%o0, %g1		/* same process? */
150	mov	EINTR, %o0	/* if no, return EINTR (child of forkall) */
151	bne	__cerror
152	restore
153
154	clr	%o0			/* clear arguments and restart */
155	clr	%o1
156	ba	door_restart
157	clr	%o2
158	SET_SIZE(__door_return)
159