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|
;; --------------------------------------------------------------------------
;;
;; Copyright 1996-2016 The NASM Authors - All Rights Reserved
;; See the file AUTHORS included with the NASM distribution for
;; the specific copyright holders.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following
;; conditions are met:
;;
;; * Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; * Redistributions in binary form must reproduce the above
;; copyright notice, this list of conditions and the following
;; disclaimer in the documentation and/or other materials provided
;; with the distribution.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
;; CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
;; INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
;; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
;; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
;; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
;; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;
;; --------------------------------------------------------------------------
;
; Smart alignment macros
;
USE: smartalign
%imacro alignmode 1-2.nolist
%ifidni %1,nop
%define __ALIGN_JMP_THRESHOLD__ 16
%define __ALIGN_16BIT_1B__ 0x90
%define __ALIGN_16BIT_GROUP__ 1
%define __ALIGN_32BIT_1B__ 0x90
%define __ALIGN_32BIT_GROUP__ 1
%define __ALIGN_64BIT_1B__ 0x90
%define __ALIGN_64BIT_GROUP__ 1
%elifidni %1,generic
%define __ALIGN_JMP_THRESHOLD__ 8
%define __ALIGN_16BIT_1B__ 0x90
%define __ALIGN_16BIT_2B__ 0x89,0xf6
%define __ALIGN_16BIT_3B__ 0x8d,0x74,0x00
%define __ALIGN_16BIT_4B__ 0x8d,0xb4,0x00,0x00
%define __ALIGN_16BIT_5B__ 0x8d,0xb4,0x00,0x00,0x90
%define __ALIGN_16BIT_6B__ 0x8d,0xb4,0x00,0x00,0x89,0xff
%define __ALIGN_16BIT_7B__ 0x8d,0xb4,0x00,0x00,0x8d,0x7d,0x00
%define __ALIGN_16BIT_8B__ 0x8d,0xb4,0x00,0x00,0x8d,0xbd,0x00,0x00
%define __ALIGN_16BIT_GROUP__ 8
%define __ALIGN_32BIT_1B__ 0x90
%define __ALIGN_32BIT_2B__ 0x89,0xf6
%define __ALIGN_32BIT_3B__ 0x8d,0x76,0x00
%define __ALIGN_32BIT_4B__ 0x8d,0x74,0x26,0x00
%define __ALIGN_32BIT_5B__ 0x90,0x8d,0x74,0x26,0x00
%define __ALIGN_32BIT_6B__ 0x8d,0xb6,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_7B__ 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_GROUP__ 7
%define __ALIGN_64BIT_1B__ 0x90
%define __ALIGN_64BIT_2B__ 0x66,0x90
%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_64BIT_GROUP__ 4
%elifidni %1,k8
%define __ALIGN_JMP_THRESHOLD__ 16
%define __ALIGN_16BIT_1B__ 0x90
%define __ALIGN_16BIT_2B__ 0x66,0x90
%define __ALIGN_16BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_16BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_16BIT_GROUP__ 4
%define __ALIGN_32BIT_1B__ 0x90
%define __ALIGN_32BIT_2B__ 0x66,0x90
%define __ALIGN_32BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_32BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_32BIT_GROUP__ 4
%define __ALIGN_64BIT_1B__ 0x90
%define __ALIGN_64BIT_2B__ 0x66,0x90
%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_64BIT_GROUP__ 4
%elifidni %1,k7
%define __ALIGN_JMP_THRESHOLD__ 16
%define __ALIGN_16BIT_1B__ 0x90
%define __ALIGN_16BIT_2B__ 0x66,0x90
%define __ALIGN_16BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_16BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_64BIT_GROUP__ 4
%define __ALIGN_32BIT_1B__ 0x90
%define __ALIGN_32BIT_2B__ 0x8b,0xc0
%define __ALIGN_32BIT_3B__ 0x8d,0x04,0x20
%define __ALIGN_32BIT_4B__ 0x8d,0x44,0x20,0x00
%define __ALIGN_32BIT_5B__ 0x8d,0x44,0x20,0x00,0x90
%define __ALIGN_32BIT_6B__ 0x8d,0x80,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_7B__ 0x8d,0x04,0x05,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_GROUP__ 7
%define __ALIGN_64BIT_1B__ 0x90
%define __ALIGN_64BIT_2B__ 0x66,0x90
%define __ALIGN_64BIT_3B__ 0x66,0x66,0x90
%define __ALIGN_64BIT_4B__ 0x66,0x66,0x66,0x90
%define __ALIGN_64BIT_GROUP__ 4
%elifidni %1,p6
%define __ALIGN_JMP_THRESHOLD__ 16
%define __ALIGN_16BIT_1B__ 0x90
%define __ALIGN_16BIT_2B__ 0x66,0x90
%define __ALIGN_16BIT_3B__ 0x0f,0x1f,0x00
%define __ALIGN_16BIT_4B__ 0x0f,0x1f,0x40,0x00
%define __ALIGN_16BIT_GROUP__ 4
%define __ALIGN_32BIT_1B__ 0x90
%define __ALIGN_32BIT_2B__ 0x66,0x90
%define __ALIGN_32BIT_3B__ 0x0f,0x1f,0x00
%define __ALIGN_32BIT_4B__ 0x0f,0x1f,0x40,0x00
%define __ALIGN_32BIT_5B__ 0x0f,0x1f,0x44,0x00,0x00
%define __ALIGN_32BIT_6B__ 0x66,0x0f,0x1f,0x44,0x00,0x00
%define __ALIGN_32BIT_7B__ 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_8B__ 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
%define __ALIGN_32BIT_GROUP__ 8
%define __ALIGN_64BIT_1B__ 0x90
%define __ALIGN_64BIT_2B__ 0x66,0x90
%define __ALIGN_64BIT_3B__ 0x0f,0x1f,0x00
%define __ALIGN_64BIT_4B__ 0x0f,0x1f,0x40,0x00
%define __ALIGN_64BIT_5B__ 0x0f,0x1f,0x44,0x00,0x00
%define __ALIGN_64BIT_6B__ 0x66,0x0f,0x1f,0x44,0x00,0x00
%define __ALIGN_64BIT_7B__ 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
%define __ALIGN_64BIT_8B__ 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
%define __ALIGN_64BIT_GROUP__ 8
%else
%error unknown alignment mode: %1
%endif
%ifnempty %2
%ifidni %2,nojmp
%xdefine __ALIGN_JMP_THRESHOLD__ -1
%else
%xdefine __ALIGN_JMP_THRESHOLD__ %2
%endif
%endif
%xdefine __ALIGNMODE__ %1,__ALIGN_JMP_THRESHOLD__
%endmacro
%unimacro align 1-2+.nolist
%imacro align 1-2+.nolist
sectalign %1 ; align a segment as well
%ifnempty %2
times (((%1) - (($-$$) % (%1))) % (%1)) %2
%elif __PASS__ == 0 || __PASS__ == 3
times (((%1) - (($-$$) % (%1))) % (%1)) nop
%else
%push
%assign %$pad (((%1) - (($-$$) % (%1))) % (%1))
%if __ALIGN_JMP_THRESHOLD__ != -1 && %$pad > __ALIGN_JMP_THRESHOLD__
jmp %$end
; We can't re-use %$pad here as $ will have changed!
times (((%1) - (($-$$) % (%1))) % (%1)) nop
%$end:
%else
times (%$pad / __ALIGN_%[__BITS__]BIT_GROUP__) \
db __ALIGN_%[__BITS__]BIT_%[__ALIGN_%[__BITS__]BIT_GROUP__]B__
%assign %$pad %$pad % __ALIGN_%[__BITS__]BIT_GROUP__
%if %$pad > 0
db __ALIGN_%[__BITS__]BIT_%[%$pad]B__
%endif
%endif
%pop
%endif
%endmacro
alignmode generic
|
