mirror of
https://github.com/netwide-assembler/nasm.git
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e38654a24e
We need to always define the end symbol, otherwise we might find ourselves in a situation where the alignment code grows (common!) and then the symbol is defined late. Reported-by: ig <glucksmann@avast.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
190 lines
6.9 KiB
Plaintext
190 lines
6.9 KiB
Plaintext
;; --------------------------------------------------------------------------
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;;
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;; Copyright 1996-2017 The NASM Authors - All Rights Reserved
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;; See the file AUTHORS included with the NASM distribution for
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;; the specific copyright holders.
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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
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;; conditions are met:
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;;
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;; * 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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;; * Redistributions in binary form must reproduce the above
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;; copyright notice, this list of conditions and the following
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;; disclaimer in the documentation and/or other materials provided
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;; with the distribution.
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;;
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;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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;; CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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;; INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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;; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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;; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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;; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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;; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;;
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;; --------------------------------------------------------------------------
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;
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; Smart alignment macros
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;
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USE: smartalign
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%imacro alignmode 1-2.nolist
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%ifidni %1,nop
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%define __ALIGN_JMP_THRESHOLD__ 16
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%define __ALIGN_16BIT_1B__ 0x90
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%define __ALIGN_16BIT_GROUP__ 1
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%define __ALIGN_32BIT_1B__ 0x90
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%define __ALIGN_32BIT_GROUP__ 1
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%define __ALIGN_64BIT_1B__ 0x90
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%define __ALIGN_64BIT_GROUP__ 1
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%elifidni %1,generic
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%define __ALIGN_JMP_THRESHOLD__ 8
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%define __ALIGN_16BIT_1B__ 0x90
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%define __ALIGN_16BIT_2B__ 0x89,0xf6
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%define __ALIGN_16BIT_3B__ 0x8d,0x74,0x00
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%define __ALIGN_16BIT_4B__ 0x8d,0xb4,0x00,0x00
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%define __ALIGN_16BIT_5B__ 0x8d,0xb4,0x00,0x00,0x90
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%define __ALIGN_16BIT_6B__ 0x8d,0xb4,0x00,0x00,0x89,0xff
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%define __ALIGN_16BIT_7B__ 0x8d,0xb4,0x00,0x00,0x8d,0x7d,0x00
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%define __ALIGN_16BIT_8B__ 0x8d,0xb4,0x00,0x00,0x8d,0xbd,0x00,0x00
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%define __ALIGN_16BIT_GROUP__ 8
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%define __ALIGN_32BIT_1B__ 0x90
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%define __ALIGN_32BIT_2B__ 0x89,0xf6
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%define __ALIGN_32BIT_3B__ 0x8d,0x76,0x00
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%define __ALIGN_32BIT_4B__ 0x8d,0x74,0x26,0x00
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%define __ALIGN_32BIT_5B__ 0x90,0x8d,0x74,0x26,0x00
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%define __ALIGN_32BIT_6B__ 0x8d,0xb6,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_7B__ 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_GROUP__ 7
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%define __ALIGN_64BIT_1B__ 0x90
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%define __ALIGN_64BIT_2B__ 0x66,0x90
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%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_64BIT_GROUP__ 4
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%elifidni %1,k8
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%define __ALIGN_JMP_THRESHOLD__ 16
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%define __ALIGN_16BIT_1B__ 0x90
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%define __ALIGN_16BIT_2B__ 0x66,0x90
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%define __ALIGN_16BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_16BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_16BIT_GROUP__ 4
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%define __ALIGN_32BIT_1B__ 0x90
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%define __ALIGN_32BIT_2B__ 0x66,0x90
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%define __ALIGN_32BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_32BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_32BIT_GROUP__ 4
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%define __ALIGN_64BIT_1B__ 0x90
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%define __ALIGN_64BIT_2B__ 0x66,0x90
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%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_64BIT_GROUP__ 4
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%elifidni %1,k7
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%define __ALIGN_JMP_THRESHOLD__ 16
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%define __ALIGN_16BIT_1B__ 0x90
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%define __ALIGN_16BIT_2B__ 0x66,0x90
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%define __ALIGN_16BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_16BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_64BIT_GROUP__ 4
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%define __ALIGN_32BIT_1B__ 0x90
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%define __ALIGN_32BIT_2B__ 0x8b,0xc0
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%define __ALIGN_32BIT_3B__ 0x8d,0x04,0x20
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%define __ALIGN_32BIT_4B__ 0x8d,0x44,0x20,0x00
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%define __ALIGN_32BIT_5B__ 0x8d,0x44,0x20,0x00,0x90
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%define __ALIGN_32BIT_6B__ 0x8d,0x80,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_7B__ 0x8d,0x04,0x05,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_GROUP__ 7
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%define __ALIGN_64BIT_1B__ 0x90
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%define __ALIGN_64BIT_2B__ 0x66,0x90
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%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
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%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
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%define __ALIGN_64BIT_GROUP__ 4
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%elifidni %1,p6
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%define __ALIGN_JMP_THRESHOLD__ 16
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%define __ALIGN_16BIT_1B__ 0x90
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%define __ALIGN_16BIT_2B__ 0x66,0x90
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%define __ALIGN_16BIT_3B__ 0x0f,0x1f,0x00
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%define __ALIGN_16BIT_4B__ 0x0f,0x1f,0x40,0x00
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%define __ALIGN_16BIT_GROUP__ 4
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%define __ALIGN_32BIT_1B__ 0x90
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%define __ALIGN_32BIT_2B__ 0x66,0x90
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%define __ALIGN_32BIT_3B__ 0x0f,0x1f,0x00
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%define __ALIGN_32BIT_4B__ 0x0f,0x1f,0x40,0x00
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%define __ALIGN_32BIT_5B__ 0x0f,0x1f,0x44,0x00,0x00
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%define __ALIGN_32BIT_6B__ 0x66,0x0f,0x1f,0x44,0x00,0x00
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%define __ALIGN_32BIT_7B__ 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_8B__ 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
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%define __ALIGN_32BIT_GROUP__ 8
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%define __ALIGN_64BIT_1B__ 0x90
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%define __ALIGN_64BIT_2B__ 0x66,0x90
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%define __ALIGN_64BIT_3B__ 0x0f,0x1f,0x00
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%define __ALIGN_64BIT_4B__ 0x0f,0x1f,0x40,0x00
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%define __ALIGN_64BIT_5B__ 0x0f,0x1f,0x44,0x00,0x00
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%define __ALIGN_64BIT_6B__ 0x66,0x0f,0x1f,0x44,0x00,0x00
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%define __ALIGN_64BIT_7B__ 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
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%define __ALIGN_64BIT_8B__ 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
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%define __ALIGN_64BIT_GROUP__ 8
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%else
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%error unknown alignment mode: %1
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%endif
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%ifnempty %2
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%ifidni %2,nojmp
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%xdefine __ALIGN_JMP_THRESHOLD__ -1
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%else
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%xdefine __ALIGN_JMP_THRESHOLD__ %2
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%endif
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%endif
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%xdefine __ALIGNMODE__ %1,__ALIGN_JMP_THRESHOLD__
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%endmacro
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%unimacro align 1-2+.nolist
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%imacro align 1-2+.nolist
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sectalign %1 ; align a segment as well
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%ifnempty %2
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times (((%1) - (($-$$) % (%1))) % (%1)) %2
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%elif __PASS__ == 0 || __PASS__ == 3
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times (((%1) - (($-$$) % (%1))) % (%1)) nop
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%else
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%push
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%assign %$pad (((%1) - (($-$$) % (%1))) % (%1))
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%if __ALIGN_JMP_THRESHOLD__ != -1 && %$pad > __ALIGN_JMP_THRESHOLD__
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jmp %$end
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; We can't re-use %$pad here as $ will have changed!
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times (((%1) - (($-$$) % (%1))) % (%1)) nop
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%else
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times (%$pad / __ALIGN_%[__BITS__]BIT_GROUP__) \
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db __ALIGN_%[__BITS__]BIT_%[__ALIGN_%[__BITS__]BIT_GROUP__]B__
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%assign %$pad %$pad % __ALIGN_%[__BITS__]BIT_GROUP__
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%if %$pad > 0
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db __ALIGN_%[__BITS__]BIT_%[%$pad]B__
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%endif
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%endif
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%$end:
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%pop
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%endif
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%endmacro
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alignmode generic
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