Make more improvements

This change includes many bug fixes, for the NT polyfills, strings,
memory, boot, and math libraries which were discovered by adding more
tools for recreational programming, such as PC emulation. Lemon has also
been vendored because it works so well at parsing languages.

build/realify.sed

@@ -0,0 +1,177 @@
+#-*-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
+s/leave\(q\|\)/leavew ; add $6,%sp/
+s/call\(q\|\)\t/sub $6,%sp ; callw /
+s/ret\(q\|\)/retw\t$6/
+s/pushq\t\(.*\)/sub $6,%sp ; push \1/
+s/popq\t\(.*\)/pop \1 ; add $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 ; push \1/
+#s/popq\t\(.*\)/pop \1 ; add $6,%sp/
+
+# 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/
+
+# 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/
+
+# 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/(%eax,%esp/(%EAX,%ESP/
+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/(%ebp,%esp/(%EBP,%ESP/
+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/(%ebx,%esp/(%EBX,%ESP/
+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/(%ecx,%esp/(%ECX,%ESP/
+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/(%edi,%esp/(%EDI,%ESP/
+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/(%edx,%esp/(%EDX,%ESP/
+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/(%esi,%esp/(%ESI,%ESP/
+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/(%esp,%esp/(%ESP,%ESP/
+s/(,%eax/(,%EAX/
+s/(,%ebx/(,%EBX/
+s/(,%ecx/(,%ECX/
+s/(,%edx/(,%EDX/
+s/(,%esi/(,%ESI/
+s/(,%edi/(,%EDI/
+s/(,%ebp/(,%EBP/
+s/(,%esp/(,%ESP/
+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 :\
+# impossible to avoid rex byte access with naive substitution
+# best workaround is avoid uint8_t* and try using uint16_t* more
+#s/dil/bl/g
+#s/sil/bh/g
+#s/spl/bl/g
+#s/bpl/bh/g
+
+# nope
+s/cltq//