201 lines
6.6 KiB
ArmAsm
201 lines
6.6 KiB
ArmAsm
/* $OpenBSD: setjmp.S,v 1.13 2023/12/10 16:45:51 deraadt Exp $ */
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/*
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* Copyright (c) 2001-2002 Opsycon AB (www.opsycon.se / www.opsycon.com)
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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 Opsycon AB 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 AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* 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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*/
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#include "SYS.h"
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#include <machine/regnum.h>
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#include <machine/setjmp.h>
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.section .openbsd.randomdata,"aw",@progbits
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.balign 8
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.globl __jmpxor
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.hidden __jmpxor
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__jmpxor:
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.space 3*REGSZ # (28/gp, 29/sp, 31/ra)
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.size __jmpxor, . - __jmpxor
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.type __jmpxor,@object
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.text
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/*
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* setjmp, longjmp implementation for libc. this code depends
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* on the layout of the struct sigcontext in machine/signal.h.
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*/
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FRAMESZ= MKFSIZ(0,4)
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GPOFF= FRAMESZ-2*REGSZ
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LEAF(setjmp, FRAMESZ)
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PTR_SUBU sp, FRAMESZ
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SETUP_GP64(GPOFF, setjmp)
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.set noreorder
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move a2, a0 # save jmpbuf
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li a0, 1 # how = SIG_BLOCK
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move a1, zero # get current signal mask
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li v0, SYS_sigprocmask
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99: syscall # mask in v0
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PINSYSCALL(SYS_sigprocmask, 99b)
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bne a3, zero, botch
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REG_S v0, _JB_MASK(a2) # save sc_mask
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LI v0, 0xACEDBADE # sigcontext magic number
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REG_S v0, _JB_REGS+ZERO*REGSZ(a2)
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REG_S s0, _JB_REGS+S0*REGSZ(a2)
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REG_S s1, _JB_REGS+S1*REGSZ(a2)
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REG_S s2, _JB_REGS+S2*REGSZ(a2)
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REG_S s3, _JB_REGS+S3*REGSZ(a2)
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REG_S s4, _JB_REGS+S4*REGSZ(a2)
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REG_S s5, _JB_REGS+S5*REGSZ(a2)
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REG_S s6, _JB_REGS+S6*REGSZ(a2)
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REG_S s7, _JB_REGS+S7*REGSZ(a2)
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REG_S s8, _JB_REGS+S8*REGSZ(a2)
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LA t0, __jmpxor # load cookie addr
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REG_L v0, 0(t0) # load gp cookie
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REG_L v1, GPOFF(sp)
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xor v0, v0, v1
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REG_S v0, _JB_REGS+GP*REGSZ(a2)
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REG_L v0, REGSZ(t0) # load sp cookie over gp cookie
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PTR_ADDU v1, sp, FRAMESZ
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xor v0, v0, v1
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REG_S v0, _JB_REGS+SP*REGSZ(a2)
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REG_L t0, 2*REGSZ(t0) # load ra cookie over addr
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xor t0, ra, t0
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REG_S t0, _JB_PC(a2)
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cfc1 t0, $31 # overwrite ra cookie
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#if _MIPS_FPSET == 32
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sdc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
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sdc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
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sdc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
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sdc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
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sdc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
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sdc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
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sdc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
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sdc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
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sdc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
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sdc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
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sdc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
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sdc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
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#else
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swc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
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swc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
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swc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
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swc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
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swc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
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swc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
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swc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
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swc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
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swc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
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swc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
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swc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
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swc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
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#endif
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REG_S t0, _JB_FPREGS+((FSR-F0)*REGSZ)(a2)
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RESTORE_GP64
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PTR_ADDU sp, FRAMESZ
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j ra
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move v0, zero
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END_STRONG(setjmp)
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LEAF(longjmp, FRAMESZ)
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PTR_SUBU sp, FRAMESZ
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SETUP_GP64(GPOFF, longjmp)
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.set noreorder
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move a2, a0 # save jmpbuf
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move a4, a1 # save val
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REG_L a1, _JB_MASK(a2) # load sc_mask
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li a0, 3 # how = SIG_SETMASK
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li v0, SYS_sigprocmask
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98: syscall
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PINSYSCALL(SYS_sigprocmask, 98b)
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bne a3, zero, botch
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REG_L v0, _JB_REGS+ZERO*REGSZ(a2)
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bne v0, 0xACEDBADE, botch # jump if error
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LA v0, __jmpxor # load cookie addr
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REG_L v1, 2*REGSZ(v0) # load ra cookie
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REG_L ra, _JB_PC(a2)
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xor ra, ra, v1
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REG_L s0, _JB_REGS+S0*REGSZ(a2)
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REG_L s1, _JB_REGS+S1*REGSZ(a2)
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REG_L s2, _JB_REGS+S2*REGSZ(a2)
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REG_L s3, _JB_REGS+S3*REGSZ(a2)
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REG_L s4, _JB_REGS+S4*REGSZ(a2)
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REG_L s5, _JB_REGS+S5*REGSZ(a2)
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REG_L s6, _JB_REGS+S6*REGSZ(a2)
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REG_L s7, _JB_REGS+S7*REGSZ(a2)
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REG_L s8, _JB_REGS+S8*REGSZ(a2)
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REG_L v1, 0(v0) # load gp cookie over ra cookie
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REG_L gp, _JB_REGS+GP*REGSZ(a2)
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xor gp, gp, v1
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REG_L v1, REGSZ(v0) # load sp cookie over gp cookie
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REG_L sp, _JB_REGS+SP*REGSZ(a2)
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xor sp, sp, v1
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REG_L v1, _JB_FPREGS+((FSR-F0)*REGSZ)(a2) # overwrite sp cookie
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ctc1 v1, $31
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#if _MIPS_FPSET == 32
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ldc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
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ldc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
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ldc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
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ldc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
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ldc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
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ldc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
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ldc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
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ldc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
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ldc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
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ldc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
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ldc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
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ldc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
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#else
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lwc1 $f20, _JB_FPREGS+((F20-F0)*REGSZ)(a2)
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lwc1 $f21, _JB_FPREGS+((F21-F0)*REGSZ)(a2)
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lwc1 $f22, _JB_FPREGS+((F22-F0)*REGSZ)(a2)
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lwc1 $f23, _JB_FPREGS+((F23-F0)*REGSZ)(a2)
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lwc1 $f24, _JB_FPREGS+((F24-F0)*REGSZ)(a2)
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lwc1 $f25, _JB_FPREGS+((F25-F0)*REGSZ)(a2)
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lwc1 $f26, _JB_FPREGS+((F26-F0)*REGSZ)(a2)
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lwc1 $f27, _JB_FPREGS+((F27-F0)*REGSZ)(a2)
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lwc1 $f28, _JB_FPREGS+((F28-F0)*REGSZ)(a2)
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lwc1 $f29, _JB_FPREGS+((F29-F0)*REGSZ)(a2)
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lwc1 $f30, _JB_FPREGS+((F30-F0)*REGSZ)(a2)
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lwc1 $f31, _JB_FPREGS+((F31-F0)*REGSZ)(a2)
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#endif
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beql a4, zero, 1f
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li a4, 1 # only executed if branch taken.
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1:
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j ra
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move v0, a4
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botch:
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jal _libc_abort
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nop
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RESTORE_GP64
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PTR_ADDU sp, FRAMESZ
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END_STRONG(longjmp)
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