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