| 1 | #
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| 2 | # Copyright (c) 2008 Josef Cejka
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | .text
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| 30 | .global setjmp
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| 31 | .global longjmp
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| 32 |
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| 33 | .type setjmp,@function
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| 34 | setjmp:
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| 35 | movl 0(%esp), %ecx # save current pc
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| 36 | leal 4(%esp), %edx # save stack pointer
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| 37 | movl (%edx), %eax # get jmp_buf pointer
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| 38 |
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| 39 | # Save registers
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| 40 | movl %ebx, 0(%eax)
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| 41 | movl %esi, 4(%eax)
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| 42 | movl %edi, 8(%eax)
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| 43 | movl %ebp, 12(%eax)
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| 44 | movl %edx, 16(%eax)
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| 45 |
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| 46 | movl %ecx, 20(%eax) # save pc
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| 47 | ret
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| 48 |
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| 49 | .type longjmp,@function
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| 50 | longjmp:
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| 51 |
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| 52 | movl 4(%esp), %ecx # put address of jmp_buf into ecx
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| 53 | movl 8(%esp), %eax # put return value into eax
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| 54 |
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| 55 | # restore all registers
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| 56 | movl 0(%ecx), %ebx
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| 57 | movl 4(%ecx), %esi
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| 58 | movl 8(%ecx), %edi
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| 59 | movl 12(%ecx), %ebp
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| 60 | movl 16(%ecx), %esp
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| 61 |
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| 62 | movl 20(%ecx), %edx # saved return address
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| 63 | jmp *%edx
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