fa432524a6
To make it easier for Native Bridge implementations to override these symbols. Bug: http://b/67993967 Test: make Change-Id: I4c53e53af494bca365dd2b3305ab0ccc2b23ba44
214 lines
5.4 KiB
ArmAsm
214 lines
5.4 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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#include <private/bionic_asm.h>
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// The internal structure of a jmp_buf is totally private.
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// Current layout (changes from release to release):
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//
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// word name description
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// 0 edx registers
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// 1 ebx
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// 2 esp
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// 3 ebp
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// 4 esi
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// 5 edi
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// 6 sigmask signal mask (not used with _setjmp / _longjmp)
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// 7 sigflag/cookie setjmp cookie in top 31 bits, signal mask flag in low bit
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// 8 checksum checksum of the core registers, to give better error messages.
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// 9 reserved
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#define _JB_EDX 0
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#define _JB_EBX 1
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#define _JB_ESP 2
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#define _JB_EBP 3
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#define _JB_ESI 4
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#define _JB_EDI 5
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#define _JB_SIGMASK 6
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#define _JB_SIGFLAG 7
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#define _JB_CHECKSUM 8
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.macro m_mangle_registers reg
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xorl \reg,%edx
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xorl \reg,%ebx
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xorl \reg,%esp
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xorl \reg,%ebp
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xorl \reg,%esi
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xorl \reg,%edi
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.endm
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.macro m_unmangle_registers reg
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m_mangle_registers \reg
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.endm
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.macro m_calculate_checksum dst, src
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movl $0, \dst
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.irp i,0,1,2,3,4,5
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xorl (\i*4)(\src), \dst
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.endr
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.endm
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ENTRY(setjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(setjmp)
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movl 4(%esp),%ecx
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mov $1,%eax
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jmp .L_sigsetjmp
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END(setjmp)
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ENTRY(_setjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_setjmp)
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movl 4(%esp),%ecx
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movl $0,%eax
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jmp .L_sigsetjmp
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END(_setjmp)
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ENTRY(sigsetjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(sigsetjmp)
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movl 4(%esp),%ecx
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movl 8(%esp),%eax
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.L_sigsetjmp:
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PIC_PROLOGUE
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pushl %eax
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call PIC_PLT(__bionic_setjmp_cookie_get)
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addl $4,%esp
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PIC_EPILOGUE
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// Record the setjmp cookie and whether or not we're saving the signal mask.
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movl %eax,(_JB_SIGFLAG * 4)(%ecx)
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// Do we need to save the signal mask?
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testl $1,%eax
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jz 1f
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// Get the current signal mask.
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PIC_PROLOGUE
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pushl $0
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call PIC_PLT(sigblock)
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addl $4,%esp
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PIC_EPILOGUE
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// Save the signal mask.
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movl 4(%esp),%ecx
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movl %eax,(_JB_SIGMASK * 4)(%ecx)
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1:
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// Fetch the setjmp cookie and clear the signal flag bit.
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movl (_JB_SIGFLAG * 4)(%ecx),%eax
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andl $-2,%eax
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// Save the callee-save registers.
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movl 0(%esp),%edx
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m_mangle_registers %eax
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movl %edx,(_JB_EDX * 4)(%ecx)
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movl %ebx,(_JB_EBX * 4)(%ecx)
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movl %esp,(_JB_ESP * 4)(%ecx)
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movl %ebp,(_JB_EBP * 4)(%ecx)
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movl %esi,(_JB_ESI * 4)(%ecx)
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movl %edi,(_JB_EDI * 4)(%ecx)
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m_unmangle_registers %eax
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m_calculate_checksum %eax, %ecx
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movl %eax, (_JB_CHECKSUM * 4)(%ecx)
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xorl %eax,%eax
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ret
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END(sigsetjmp)
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ENTRY(siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(siglongjmp)
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movl 4(%esp),%edx
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// Check the checksum before doing anything.
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m_calculate_checksum %eax, %edx
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xorl (_JB_CHECKSUM * 4)(%edx), %eax
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jnz 3f
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// Do we have a signal mask to restore?
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movl (_JB_SIGFLAG * 4)(%edx), %eax
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testl $1,%eax
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jz 1f
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// Restore the signal mask.
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PIC_PROLOGUE
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pushl (_JB_SIGMASK * 4)(%edx)
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call PIC_PLT(sigsetmask)
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addl $4,%esp
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PIC_EPILOGUE
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1:
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// Restore the callee-save registers.
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movl 4(%esp),%edx
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movl 8(%esp),%eax
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movl (_JB_SIGFLAG * 4)(%edx),%ecx
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andl $-2,%ecx
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movl %ecx,%ebx
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movl %ecx,%esp
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movl %ecx,%ebp
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movl %ecx,%esi
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movl %ecx,%edi
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xorl (_JB_EDX * 4)(%edx),%ecx
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xorl (_JB_EBX * 4)(%edx),%ebx
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xorl (_JB_ESP * 4)(%edx),%esp
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xorl (_JB_EBP * 4)(%edx),%ebp
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xorl (_JB_ESI * 4)(%edx),%esi
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xorl (_JB_EDI * 4)(%edx),%edi
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PIC_PROLOGUE
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pushl %eax
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pushl %ecx
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pushl (_JB_SIGFLAG * 4)(%edx)
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call PIC_PLT(__bionic_setjmp_cookie_check)
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addl $4,%esp
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popl %ecx
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popl %eax
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PIC_EPILOGUE
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testl %eax,%eax
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jnz 2f
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incl %eax
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2:
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movl %ecx,0(%esp)
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ret
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3:
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PIC_PROLOGUE
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pushl (_JB_SIGMASK * 4)(%edx)
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call PIC_PLT(__bionic_setjmp_checksum_mismatch)
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END(siglongjmp)
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ALIAS_SYMBOL(longjmp, siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(longjmp)
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ALIAS_SYMBOL(_longjmp, siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_longjmp)
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