2 * Copyright (c) 2003 Peter Wemm
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <machine/asmacros.h>
30 #include <sys/syscall.h>
32 #include "ia32_assym.h"
37 * Signal trampoline, copied to top of user stack
38 * XXX may need to be MD to match backend sendsig handoff protocol
43 calll *IA32_SIGF_HANDLER(%esp)
44 leal IA32_SIGF_UC(%esp),%eax /* get ucontext */
46 movl $SYS_sigreturn,%eax
47 pushl %eax /* junk to fake return addr. */
48 int $0x80 /* enter kernel with args */
53 #ifdef COMPAT_FREEBSD4
55 freebsd4_ia32_sigcode:
56 calll *IA32_SIGF_HANDLER(%esp)
57 leal IA32_SIGF_UC4(%esp),%eax/* get ucontext */
59 movl $344,%eax /* 4.x SYS_sigreturn */
60 pushl %eax /* junk to fake return addr. */
61 int $0x80 /* enter kernel with args */
70 calll *IA32_SIGF_HANDLER(%esp)/* call signal handler */
71 leal IA32_SIGF_SC(%esp),%eax /* get sigcontext */
73 movl $103,%eax /* 3.x SYS_sigreturn */
74 pushl %eax /* junk to fake return addr. */
75 int $0x80 /* enter kernel with args */
80 * Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls
81 * don't change the interrupt mask, so if this one went directly to the
82 * kernel then there would be a window with interrupts enabled in kernel
83 * mode, and all interrupt handlers would have to be almost as complicated
84 * as the NMI handler to support this.
86 * Instead, convert the lcall to an int0x80 call. The kernel does most
87 * of the conversion by popping the lcall return values off the user
88 * stack and returning to them instead of to here, except when the
89 * conversion itself fails. Adjusting the stack here is impossible for
90 * vfork() and harder for other syscalls.
102 .globl sz_ia32_sigcode
104 .long esigcode-ia32_sigcode
105 #ifdef COMPAT_FREEBSD4
106 .globl sz_freebsd4_ia32_sigcode
107 sz_freebsd4_ia32_sigcode:
108 .long esigcode-freebsd4_ia32_sigcode
111 .globl sz_ia32_osigcode
113 .long esigcode-ia32_osigcode
114 .globl sz_lcall_tramp
116 .long esigcode-lcall_tramp