1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91
33 * $FreeBSD: releng/11.2/sys/i386/i386/sigtramp.s 329199 2018-02-13 12:54:03Z kib $
34 *
35 * originally from: locore.s, by William F. Jolitz
36 *
37 * Substantially rewritten by David Greenman, Rod Grimes,
38 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
39 * and many others.
40 */
41
42 #include "opt_compat.h"
43
44 #include <sys/syscall.h>
45 #include <machine/asmacros.h>
46 #include <machine/psl.h>
47
48 #include "assym.s"
49
50 /*
51 * Signal trampoline, copied to top of user stack
52 */
53 NON_GPROF_ENTRY(sigcode)
54 calll *SIGF_HANDLER(%esp)
55 leal SIGF_UC(%esp),%eax /* get ucontext */
56 pushl %eax
57 testl $PSL_VM,UC_EFLAGS(%eax)
58 jne 1f
59 mov UC_GS(%eax),%gs /* restore %gs */
60 1:
61 movl $SYS_sigreturn,%eax
62 pushl %eax /* junk to fake return addr. */
63 int $0x80 /* enter kernel with args */
64 /* on stack */
65 1:
66 jmp 1b
67
68 #ifdef COMPAT_FREEBSD4
69 ALIGN_TEXT
70 freebsd4_sigcode:
71 calll *SIGF_HANDLER(%esp)
72 leal SIGF_UC4(%esp),%eax /* get ucontext */
73 pushl %eax
74 testl $PSL_VM,UC4_EFLAGS(%eax)
75 jne 1f
76 mov UC4_GS(%eax),%gs /* restore %gs */
77 1:
78 movl $344,%eax /* 4.x SYS_sigreturn */
79 pushl %eax /* junk to fake return addr. */
80 int $0x80 /* enter kernel with args */
81 /* on stack */
82 1:
83 jmp 1b
84 #endif
85
86 #ifdef COMPAT_43
87 ALIGN_TEXT
88 osigcode:
89 call *SIGF_HANDLER(%esp) /* call signal handler */
90 lea SIGF_SC(%esp),%eax /* get sigcontext */
91 pushl %eax
92 testl $PSL_VM,SC_PS(%eax)
93 jne 9f
94 mov SC_GS(%eax),%gs /* restore %gs */
95 9:
96 movl $103,%eax /* 3.x SYS_sigreturn */
97 pushl %eax /* junk to fake return addr. */
98 int $0x80 /* enter kernel with args */
99 0: jmp 0b
100 #endif /* COMPAT_43 */
101
102 ALIGN_TEXT
103 esigcode:
104
105 .data
106 .globl szsigcode
107 szsigcode:
108 .long esigcode-sigcode
109 #ifdef COMPAT_FREEBSD4
110 .globl szfreebsd4_sigcode
111 szfreebsd4_sigcode:
112 .long esigcode-freebsd4_sigcode
113 #endif
114 #ifdef COMPAT_43
115 .globl szosigcode
116 szosigcode:
117 .long esigcode-osigcode
118 #endif
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