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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $FreeBSD$
*
* originally from: locore.s, by William F. Jolitz
*
* Substantially rewritten by David Greenman, Rod Grimes,
* Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
* and many others.
*/
#include <sys/syscall.h>
#include <machine/asmacros.h>
#include <machine/psl.h>
#include "assym.inc"
/*
* Signal trampoline, copied to top of user stack
*/
ENTRY(sigcode)
calll *SIGF_HANDLER(%esp)
leal SIGF_UC(%esp),%eax /* get ucontext */
pushl %eax
testl $PSL_VM,UC_EFLAGS(%eax)
jne 1f
mov UC_GS(%eax),%gs /* restore %gs */
1:
movl $SYS_sigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
1:
jmp 1b
#ifdef COMPAT_FREEBSD4
ALIGN_TEXT
freebsd4_sigcode:
calll *SIGF_HANDLER(%esp)
leal SIGF_UC4(%esp),%eax /* get ucontext */
pushl %eax
testl $PSL_VM,UC4_EFLAGS(%eax)
jne 1f
mov UC4_GS(%eax),%gs /* restore %gs */
1:
movl $344,%eax /* 4.x SYS_sigreturn */
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
1:
jmp 1b
#endif
#ifdef COMPAT_43
ALIGN_TEXT
osigcode:
call *SIGF_HANDLER(%esp) /* call signal handler */
lea SIGF_SC(%esp),%eax /* get sigcontext */
pushl %eax
testl $PSL_VM,SC_PS(%eax)
jne 9f
mov SC_GS(%eax),%gs /* restore %gs */
9:
movl $103,%eax /* 3.x SYS_sigreturn */
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
0: jmp 0b
/*
* Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls
* don't change the interrupt mask, so if this one went directly to the
* kernel then there would be a window with interrupts enabled in kernel
* mode, and all interrupt handlers would have to be almost as complicated
* as the NMI handler to support this.
*
* Instead, convert the lcall to an int0x80 call. The kernel does most
* of the conversion by popping the lcall return values off the user
* stack and returning to them instead of to here, except when the
* conversion itself fails. Adjusting the stack here is impossible for
* vfork() and harder for other syscalls.
*/
ALIGN_TEXT
lcall_tramp:
int $0x80
1: jmp 1b
#endif /* COMPAT_43 */
ALIGN_TEXT
esigcode:
.data
.globl szsigcode
szsigcode:
.long esigcode-sigcode
#ifdef COMPAT_FREEBSD4
.globl szfreebsd4_sigcode
szfreebsd4_sigcode:
.long esigcode-freebsd4_sigcode
#endif
#ifdef COMPAT_43
.globl szosigcode
szosigcode:
.long esigcode-osigcode
.globl sz_lcall_tramp
sz_lcall_tramp:
.long esigcode-lcall_tramp
#endif
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