103 lines
2.5 KiB
ArmAsm
103 lines
2.5 KiB
ArmAsm
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x86/setjmp.S
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* Implement the assembly part of setjmp.
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*/
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#define SIG_SETMASK 2
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/*
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* sigjmp_buf[0] = %ebx
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* sigjmp_buf[1] = %esi
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* sigjmp_buf[2] = %edi
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* sigjmp_buf[3] = %ebp
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* sigjmp_buf[4] = %esp
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* sigjmp_buf[5] = <return-address>
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* sigjmp_buf[6] = <non-zero if sigmask saved>
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* sigjmp_buf[7...] = <saved sigmask if sigjmp_buf[6] != 0>
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*/
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.global setjmp
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.type setjmp, @function
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setjmp:
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# setjmp saves the signal mask on Sortix
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jmp 1f
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.size setjmp, . - setjmp
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.global sigsetjmp
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.type sigsetjmp, @function
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sigsetjmp:
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movl 8(%esp), %edx
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testl %edx, %edx
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jz 2f
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1: movl 4(%esp), %ecx
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leal (7 * 4)(%ecx), %edx
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pushl %edx # oldset
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pushl $0 # set
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pushl $0 # how (ignored because set is NULL)
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call sigprocmask
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addl $(3 * 4), %esp
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movl $1, %edx
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2: movl 4(%esp), %ecx
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movl 0(%esp), %eax
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movl %ebx, (0 * 4)(%ecx)
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movl %esi, (1 * 4)(%ecx)
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movl %edi, (2 * 4)(%ecx)
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movl %ebp, (3 * 4)(%ecx)
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movl %esp, (4 * 4)(%ecx)
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movl %eax, (5 * 4)(%ecx)
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movl %edx, (6 * 4)(%ecx)
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xorl %eax, %eax
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ret
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.size sigsetjmp, . - sigsetjmp
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.global longjmp
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.type longjmp, @function
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longjmp:
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jmp siglongjmp
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.size longjmp, . - longjmp
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.global siglongjmp
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.type siglongjmp, @function
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siglongjmp:
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movl 4(%esp), %ecx
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movl 8(%esp), %eax
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testl %eax, %eax
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jnz 1f
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movl $1, %eax
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1: movl (6 * 4)(%ecx), %edx
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testl %edx, %edx
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jz 2f
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pushl %eax
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pushl %ecx
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pushl $0 # oldset
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leal (7 * 4)(%ecx), %edx
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pushl %edx # set
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pushl $SIG_SETMASK # how
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call sigprocmask
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addl $(3 * 4), %esp
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popl %ecx
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popl %eax
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2: movl (0 * 4)(%ecx), %ebx
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movl (1 * 4)(%ecx), %esi
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movl (2 * 4)(%ecx), %edi
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movl (3 * 4)(%ecx), %ebp
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movl (4 * 4)(%ecx), %esp
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movl (5 * 4)(%ecx), %edx
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movl %edx, 0(%esp)
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ret
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.size siglongjmp, . - siglongjmp
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