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/* $OpenBSD: setjmp.S,v 1.11 2016/05/29 07:59:36 guenther Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
*/
#include "SYS.h"
.section .openbsd.randomdata,"aw",@progbits
.align 4
.L__jmpxor
.zero 4*2 ; (r2/rp, r30/sp)
/*
* C library -- setjmp, longjmp
*
* longjmp(a,v)
* will generate a "return(v)" from
* the last call to
* setjmp(a)
* by restoring registers from the stack,
* and a struct sigcontext, see <signal.h>
*/
ENTRY(sigsetjmp, 64)
sub,<> %r0, %arg1, %r0
b .L_setjmp$dosaves
stw %arg1, 44(%arg0) ; last of reserved words
ALTENTRY(setjmp)
copy %arg0, %arg2 ; save jmpbuf in %arg2
ldi 1, %arg0 ; how = SIG_BLOCK
copy %r0, %arg1 ; set = empty
stw %rp, HPPA_FRAME_ERP(%sr0,%sp)
ldil L%SYSCALLGATE, %r1
ble 4(%sr7, %r1)
ldi SYS_sigprocmask, %t1
ldw HPPA_FRAME_ERP(%sr0,%sp), %rp
copy %arg2, %arg0 ; restore jmpbuf to %arg0
stw %ret0, 4(%arg0) ; mask
ALTENTRY(_setjmp)
.L_setjmp$dosaves
#ifdef __PIC__
addil LT%.L__jmpxor, %r19
ldw RT%.L__jmpxor(%r1), %t2
#else
ldil L%.L__jmpxor, %t1
ldo R%.L__jmpxor(%t1), %t2
#endif
ldw 0(%t2), %t1 ; xor for r2/rp
ldw 4(%t2), %t2 ; xor for r30/sp, overwrite address
xor %sp, %t2, %t2
stw %t2, 12(%arg0) ; sc.sc_sp = %sp
xor %rp, %t1, %t1
stw %t1, 20(%arg0) ; sc.sc_pcoqh = %rp
copy %r0, %t1
copy %r0, %t2
/* We store all callee-saved registers after the sigcontext. */
ldo 48(%arg0), %r1 ; offset to after sc
stwm %r3, 4(%r1)
stwm %r4, 4(%r1)
stwm %r5, 4(%r1)
stwm %r6, 4(%r1)
stwm %r7, 4(%r1)
stwm %r8, 4(%r1)
stwm %r9, 4(%r1)
stwm %r10, 4(%r1)
stwm %r11, 4(%r1)
stwm %r12, 4(%r1)
stwm %r13, 4(%r1)
stwm %r14, 4(%r1)
stwm %r15, 4(%r1)
stwm %r16, 4(%r1)
stwm %r17, 4(%r1)
stwm %r18, 4(%r1)
/* Return 0. */
bv %r0(%rp)
copy %r0, %ret0
EXIT(sigsetjmp)
.size _setjmp, . - _setjmp
.size setjmp, . - setjmp
ENTRY(siglongjmp,64)
ldw 44(%arg0), %arg2
sub,<> %r0, %arg2, %r0
b .L_longjmp$restores
nop
ALTENTRY(longjmp)
copy %arg1, %arg3 ; save val in %arg3
copy %arg0, %arg2 ; save jmpbuf in %arg2
ldw 4(%arg0), %arg1 ; set from jumpbuf
ldi 3, %arg0 ; how = SIG_SETMASK
stw %rp, HPPA_FRAME_ERP(%sr0,%sp)
ldil L%SYSCALLGATE, %r1
ble 4(%sr7, %r1)
ldi SYS_sigprocmask, %t1
ldw HPPA_FRAME_ERP(%sr0,%sp), %rp
copy %arg2, %arg0 ; restore jmpbuf to %arg0
copy %arg3, %arg1 ; restore val to %arg1
ALTENTRY(_longjmp)
.L_longjmp$restores
/* restore callee-saved registers */
ldo 48(%arg0), %r1
ldwm 4(%r1), %r3
ldwm 4(%r1), %r4
ldwm 4(%r1), %r5
ldwm 4(%r1), %r6
ldwm 4(%r1), %r7
ldwm 4(%r1), %r8
ldwm 4(%r1), %r9
ldwm 4(%r1), %r10
ldwm 4(%r1), %r11
ldwm 4(%r1), %r12
ldwm 4(%r1), %r13
ldwm 4(%r1), %r14
ldwm 4(%r1), %r15
ldwm 4(%r1), %r16
ldwm 4(%r1), %r17
ldwm 4(%r1), %r18
/* restore the rest */
#ifdef __PIC__
addil LT%.L__jmpxor, %r19
ldw RT%.L__jmpxor(%r1), %t2
#else
ldil L%.L__jmpxor, t1
ldo R%.L__jmpxor(t1), t2
#endif
ldw 0(t2), t1 ; xor for r2/rp
ldw 4(t2), t2 ; xor for r30/sp, overwrite address
ldw 12(%arg0), %r1
xor %r1, %t2, %sp
ldw 20(%arg0), %r1
xor %r1, %t1, %rp
copy %r0, %t1 ; overwrite the cookies
copy %r0, %t2
sub,<> %arg1, %r0, %r0
ldo 1(%arg1), %arg1
bv %r0(%rp)
copy %arg1, %ret0
EXIT(siglongjmp)
.size _longjmp, . - _longjmp
.size longjmp, . - longjmp
.end
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