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/* $OpenBSD: setjmp.S,v 1.12 2018/01/08 16:44:32 visa Exp $ */
/*
* Copyright (c) 2001-2002 Opsycon AB (www.opsycon.se / www.opsycon.com)
*
* 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 Opsycon AB 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 AUTHOR ``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 AUTHOR 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"
#include <machine/regnum.h>
#include <machine/setjmp.h>
.section .openbsd.randomdata,"aw",@progbits
.balign 8
.globl __jmpxor
.hidden __jmpxor
__jmpxor:
.space 3*REGSZ # (28/gp, 29/sp, 31/ra)
.size __jmpxor, . - __jmpxor
.type __jmpxor,@object
.text
/*
* setjmp, longjmp implementation for libc. this code depends
* on the layout of the struct sigcontext in machine/signal.h.
*/
FRAMESZ= MKFSIZ(0,4)
GPOFF= FRAMESZ-2*REGSZ
LEAF(setjmp, FRAMESZ)
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, setjmp)
.set noreorder
move a2, a0 # save jmpbuf
li a0, 1 # how = SIG_BLOCK
move a1, zero # get current signal mask
li v0, SYS_sigprocmask
syscall # mask in v0
bne a3, zero, botch
REG_S v0, _JB_MASK(a2) # save sc_mask
LI v0, 0xACEDBADE # sigcontext magic number
REG_S v0, _JB_REGS+ZERO*REGSZ(a2)
REG_S s0, _JB_REGS+S0*REGSZ(a2)
REG_S s1, _JB_REGS+S1*REGSZ(a2)
REG_S s2, _JB_REGS+S2*REGSZ(a2)
REG_S s3, _JB_REGS+S3*REGSZ(a2)
REG_S s4, _JB_REGS+S4*REGSZ(a2)
REG_S s5, _JB_REGS+S5*REGSZ(a2)
REG_S s6, _JB_REGS+S6*REGSZ(a2)
REG_S s7, _JB_REGS+S7*REGSZ(a2)
REG_S s8, _JB_REGS+S8*REGSZ(a2)
LA t0, __jmpxor # load cookie addr
REG_L v0, 0(t0) # load gp cookie
REG_L v1, GPOFF(sp)
xor v0, v0, v1
REG_S v0, _JB_REGS+GP*REGSZ(a2)
REG_L v0, REGSZ(t0) # load sp cookie over gp cookie
PTR_ADDU v1, sp, FRAMESZ
xor v0, v0, v1
REG_S v0, _JB_REGS+SP*REGSZ(a2)
REG_L t0, 2*REGSZ(t0) # load ra cookie over addr
xor t0, ra, t0
REG_S t0, _JB_PC(a2)
cfc1 t0, $31 # overwrite ra cookie
#if _MIPS_FPSET == 32
sdc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
sdc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
sdc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
sdc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
sdc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
sdc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
sdc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
sdc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
sdc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
sdc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
sdc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
sdc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
#else
swc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
swc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
swc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
swc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
swc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
swc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
swc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
swc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
swc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
swc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
swc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
swc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
#endif
REG_S t0, _JB_FPREGS+((FSR-F0)*REGSZ)(a2)
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
j ra
move v0, zero
END_STRONG(setjmp)
LEAF(longjmp, FRAMESZ)
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, longjmp)
.set noreorder
move a2, a0 # save jmpbuf
move a4, a1 # save val
REG_L a1, _JB_MASK(a2) # load sc_mask
li a0, 3 # how = SIG_SETMASK
li v0, SYS_sigprocmask
syscall
bne a3, zero, botch
REG_L v0, _JB_REGS+ZERO*REGSZ(a2)
bne v0, 0xACEDBADE, botch # jump if error
LA v0, __jmpxor # load cookie addr
REG_L v1, 2*REGSZ(v0) # load ra cookie
REG_L ra, _JB_PC(a2)
xor ra, ra, v1
REG_L s0, _JB_REGS+S0*REGSZ(a2)
REG_L s1, _JB_REGS+S1*REGSZ(a2)
REG_L s2, _JB_REGS+S2*REGSZ(a2)
REG_L s3, _JB_REGS+S3*REGSZ(a2)
REG_L s4, _JB_REGS+S4*REGSZ(a2)
REG_L s5, _JB_REGS+S5*REGSZ(a2)
REG_L s6, _JB_REGS+S6*REGSZ(a2)
REG_L s7, _JB_REGS+S7*REGSZ(a2)
REG_L s8, _JB_REGS+S8*REGSZ(a2)
REG_L v1, 0(v0) # load gp cookie over ra cookie
REG_L gp, _JB_REGS+GP*REGSZ(a2)
xor gp, gp, v1
REG_L v1, REGSZ(v0) # load sp cookie over gp cookie
REG_L sp, _JB_REGS+SP*REGSZ(a2)
xor sp, sp, v1
REG_L v1, _JB_FPREGS+((FSR-F0)*REGSZ)(a2) # overwrite sp cookie
ctc1 v1, $31
#if _MIPS_FPSET == 32
ldc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
ldc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
ldc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
ldc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
ldc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
ldc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
ldc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
ldc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
ldc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
ldc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
ldc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
ldc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
#else
lwc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
lwc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
lwc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
lwc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
lwc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
lwc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
lwc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
lwc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
lwc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
lwc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
lwc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
lwc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
#endif
beql a4, zero, 1f
li a4, 1 # only executed if branch taken.
1:
j ra
move v0, a4
botch:
jal _libc_abort
nop
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
END_STRONG(longjmp)
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