2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * originally from: locore.s, by William F. Jolitz
34 * Substantially rewritten by David Greenman, Rod Grimes,
35 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
39 #include <sys/syscall.h>
40 #include <machine/asmacros.h>
41 #include <machine/psl.h>
46 * Signal trampoline, copied to top of user stack
49 calll *SIGF_HANDLER(%esp)
50 leal SIGF_UC(%esp),%eax /* get ucontext */
52 testl $PSL_VM,UC_EFLAGS(%eax)
54 mov UC_GS(%eax),%gs /* restore %gs */
56 movl $SYS_sigreturn,%eax
57 pushl %eax /* junk to fake return addr. */
58 int $0x80 /* enter kernel with args */
63 #ifdef COMPAT_FREEBSD4
66 calll *SIGF_HANDLER(%esp)
67 leal SIGF_UC4(%esp),%eax /* get ucontext */
69 testl $PSL_VM,UC4_EFLAGS(%eax)
71 mov UC4_GS(%eax),%gs /* restore %gs */
73 movl $344,%eax /* 4.x SYS_sigreturn */
74 pushl %eax /* junk to fake return addr. */
75 int $0x80 /* enter kernel with args */
84 call *SIGF_HANDLER(%esp) /* call signal handler */
85 lea SIGF_SC(%esp),%eax /* get sigcontext */
87 testl $PSL_VM,SC_PS(%eax)
89 mov SC_GS(%eax),%gs /* restore %gs */
91 movl $103,%eax /* 3.x SYS_sigreturn */
92 pushl %eax /* junk to fake return addr. */
93 int $0x80 /* enter kernel with args */
97 * Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls
98 * don't change the interrupt mask, so if this one went directly to the
99 * kernel then there would be a window with interrupts enabled in kernel
100 * mode, and all interrupt handlers would have to be almost as complicated
101 * as the NMI handler to support this.
103 * Instead, convert the lcall to an int0x80 call. The kernel does most
104 * of the conversion by popping the lcall return values off the user
105 * stack and returning to them instead of to here, except when the
106 * conversion itself fails. Adjusting the stack here is impossible for
107 * vfork() and harder for other syscalls.
114 #endif /* COMPAT_43 */
122 .long esigcode-sigcode
123 #ifdef COMPAT_FREEBSD4
124 .globl szfreebsd4_sigcode
126 .long esigcode-freebsd4_sigcode
131 .long esigcode-osigcode
132 .globl sz_lcall_tramp
134 .long esigcode-lcall_tramp