181 lines
4.3 KiB
Sed
181 lines
4.3 KiB
Sed
#-*-mode:sed;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
|
|
#───vi: et ft=sed ts=8 tw=8 fenc=utf-8 :vi─────────────────┘
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# sed -i -f build/realify.sed foo.s
|
|
#
|
|
# OVERVIEW
|
|
#
|
|
# This converts ints and longs to shorts while preserving System V ABI
|
|
# x86_64 compatibility. This works better than gcc -m16 because we can
|
|
# avoid the ASZ and OSZ prefixes in most cases while also avoiding the
|
|
# legacy 32-bit calling conventions.
|
|
|
|
# remove comments
|
|
s/[ \t][ \t]*#.*//
|
|
|
|
# preserve hardcoded stack offsets
|
|
# bloats code size 13% compared to recomputing stack solution
|
|
s/leave\(q\|\)/leavew\n\tadd\t$6,%sp/
|
|
s/call\(q\|\)\t/sub\t$6,%sp\n\tcallw\t/
|
|
s/ret\(q\|\)/retw\t$6/
|
|
s/pushq\t\(.*\)/sub\t$6,%sp\n\tpush\t\1/
|
|
s/popq\t\(.*\)/pop\t\1\n\tadd\t$6,%sp/
|
|
|
|
# can be used instead if
|
|
# 1. functions have 6 args or fewer
|
|
# 2. long double parameters forceinline
|
|
#s/leave\(q\|\)/leavew/
|
|
#s/call\(q\|\)/callw/
|
|
#s/ret\(q\|\)/retw/
|
|
#s/popq\t%rbp/pop\t%bp/
|
|
#s/pushq\t%rbp/push\t%bp/
|
|
#s/pushq\t\(.*\)/sub $6,%sp\n\tpush \1/
|
|
#s/popq\t\(.*\)/pop \1\n\tadd $6,%sp/
|
|
|
|
s/, /,/g
|
|
|
|
# 32-bitify
|
|
s/rax/eax/g
|
|
s/rbx/ebx/g
|
|
s/rcx/ecx/g
|
|
s/rdx/edx/g
|
|
s/rbp/ebp/g
|
|
s/rdi/edi/g
|
|
s/rsi/esi/g
|
|
s/rsp/esp/g
|
|
|
|
# unextension
|
|
s/movswl/mov/
|
|
s/movzwl/mov/
|
|
s/movslq/mov/
|
|
s/movzlq/mov/
|
|
s/movsbl/movsbw/
|
|
|
|
# unsuffix
|
|
s/^\(\t\(fild\|fist\|fistp\|fiadd\|fisub\|fisubr\|fimul\|fidiv\|fidivr\|ficom\)\)q\t/\1\t/
|
|
s/^\(\t\(mov\|add\|adc\|cmp\|test\|lea\|sbb\|mul\|imul\|div\|idiv\|in\|out\|xor\|sub\|and\|or\|rol\|ror\|rcl\|rcr\|shl\|shr\|sal\|sar\|inc\|dec\|not\|neg\)\)l\t/\1w\t/
|
|
s/^\(\t[a-z]*\)q\t/\1w\t/
|
|
s/movsww/mov/
|
|
|
|
# remove fluff
|
|
s/mov\t%eax,%eax//
|
|
s/mov\t%ebx,%ebx//
|
|
s/mov\t%ecx,%ecx//
|
|
s/mov\t%edx,%edx//
|
|
s/mov\t%ebp,%ebp//
|
|
s/mov\t%edi,%edi//
|
|
s/mov\t%esi,%esi//
|
|
s/mov\t%esp,%esp//
|
|
|
|
# make pic absolute
|
|
s/(%rip)//
|
|
|
|
# legal real mode modrm
|
|
s/(%ebx)/(%bx)/
|
|
s/(%edi)/(%di)/
|
|
s/(%esi)/(%si)/
|
|
s/(%ebp)/(%bp)/
|
|
s/(%ebx,%esi\(,1\|\))/(%bx,%si)/
|
|
s/(%ebx,%edi\(,1\|\))/(%bx,%di)/
|
|
s/(%ebp,%esi\(,1\|\))/(%bp,%si)/
|
|
s/(%ebp,%edi\(,1\|\))/(%bp,%di)/
|
|
|
|
# we need the asz prefix
|
|
s/(%eax,%eax/(%EAX,%EAX/
|
|
s/(%eax,%ebp/(%EAX,%EBP/
|
|
s/(%eax,%ebx/(%EAX,%EBX/
|
|
s/(%eax,%ecx/(%EAX,%ECX/
|
|
s/(%eax,%edi/(%EAX,%EDI/
|
|
s/(%eax,%edx/(%EAX,%EDX/
|
|
s/(%eax,%esi/(%EAX,%ESI/
|
|
s/(%ebp,%eax/(%EBP,%EAX/
|
|
s/(%ebp,%ebp/(%EBP,%EBP/
|
|
s/(%ebp,%ebx/(%EBP,%EBX/
|
|
s/(%ebp,%ecx/(%EBP,%ECX/
|
|
s/(%ebp,%edi/(%EBP,%EDI/
|
|
s/(%ebp,%edx/(%EBP,%EDX/
|
|
s/(%ebp,%esi/(%EBP,%ESI/
|
|
s/(%ebx,%eax/(%EBX,%EAX/
|
|
s/(%ebx,%ebp/(%EBX,%EBP/
|
|
s/(%ebx,%ebx/(%EBX,%EBX/
|
|
s/(%ebx,%ecx/(%EBX,%ECX/
|
|
s/(%ebx,%edi/(%EBX,%EDI/
|
|
s/(%ebx,%edx/(%EBX,%EDX/
|
|
s/(%ebx,%esi/(%EBX,%ESI/
|
|
s/(%ecx,%eax/(%ECX,%EAX/
|
|
s/(%ecx,%ebp/(%ECX,%EBP/
|
|
s/(%ecx,%ebx/(%ECX,%EBX/
|
|
s/(%ecx,%ecx/(%ECX,%ECX/
|
|
s/(%ecx,%edi/(%ECX,%EDI/
|
|
s/(%ecx,%edx/(%ECX,%EDX/
|
|
s/(%ecx,%esi/(%ECX,%ESI/
|
|
s/(%edi,%eax/(%EDI,%EAX/
|
|
s/(%edi,%ebp/(%EDI,%EBP/
|
|
s/(%edi,%ebx/(%EDI,%EBX/
|
|
s/(%edi,%ecx/(%EDI,%ECX/
|
|
s/(%edi,%edi/(%EDI,%EDI/
|
|
s/(%edi,%edx/(%EDI,%EDX/
|
|
s/(%edi,%esi/(%EDI,%ESI/
|
|
s/(%edx,%eax/(%EDX,%EAX/
|
|
s/(%edx,%ebp/(%EDX,%EBP/
|
|
s/(%edx,%ebx/(%EDX,%EBX/
|
|
s/(%edx,%ecx/(%EDX,%ECX/
|
|
s/(%edx,%edi/(%EDX,%EDI/
|
|
s/(%edx,%edx/(%EDX,%EDX/
|
|
s/(%edx,%esi/(%EDX,%ESI/
|
|
s/(%esi,%eax/(%ESI,%EAX/
|
|
s/(%esi,%ebp/(%ESI,%EBP/
|
|
s/(%esi,%ebx/(%ESI,%EBX/
|
|
s/(%esi,%ecx/(%ESI,%ECX/
|
|
s/(%esi,%edi/(%ESI,%EDI/
|
|
s/(%esi,%edx/(%ESI,%EDX/
|
|
s/(%esi,%esi/(%ESI,%ESI/
|
|
s/(%esp,%eax/(%ESP,%EAX/
|
|
s/(%esp,%ebp/(%ESP,%EBP/
|
|
s/(%esp,%ebx/(%ESP,%EBX/
|
|
s/(%esp,%ecx/(%ESP,%ECX/
|
|
s/(%esp,%edi/(%ESP,%EDI/
|
|
s/(%esp,%edx/(%ESP,%EDX/
|
|
s/(%esp,%esi/(%ESP,%ESI/
|
|
s/(,%eax/(,%EAX/
|
|
s/(,%ebx/(,%EBX/
|
|
s/(,%ecx/(,%ECX/
|
|
s/(,%edx/(,%EDX/
|
|
s/(,%esi/(,%ESI/
|
|
s/(,%edi/(,%EDI/
|
|
s/(,%ebp/(,%EBP/
|
|
s/(%eax)/(%EAX)/
|
|
s/(%ecx)/(%ECX)/
|
|
s/(%edx)/(%EDX)/
|
|
s/(%esp)/(%ESP)/
|
|
|
|
# 16bitify
|
|
s/eax/ax/g
|
|
s/ebx/bx/g
|
|
s/ecx/cx/g
|
|
s/edx/dx/g
|
|
s/ebp/bp/g
|
|
s/edi/di/g
|
|
s/esi/si/g
|
|
s/esp/sp/g
|
|
|
|
# sigh :\
|
|
# gcc needs a flag for not using rex byte regs. workaround:
|
|
# - %dil can be avoided through copious use of STOS() macro
|
|
# - %sil can be avoided through copious use of LODS() macro
|
|
# - %bpl shouldn't be allocated due to -fno-omit-frame-pointer
|
|
# - %spl shouldn't be allocated like ever
|
|
# beyond that there's only a few cases where %dil and %sil
|
|
# need some handcoded asm() macros to workaround, for example
|
|
# if ARG1 is long and you say (ARG1 & 1) gcc will use %dil
|
|
# so just kludge it using asm("and\t$1,%0" : "+Q"(ARG1))
|
|
#s/dil/bl/g
|
|
#s/sil/bh/g
|
|
#s/spl/bl/g
|
|
#s/bpl/bh/g
|
|
|
|
# nope
|
|
s/cltq//
|