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Initial import

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Justine Tunney 2020-06-15 07:18:57 -07:00
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108
libc/nt/codegen.sh Normal file
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/*bin/echo ' -*- mode:sh; indent-tabs-mode:nil; tab-width:8; coding:utf-8 -*-│
│vi: set net ft=sh ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚────────────────────────────────────────────────────────────────'>/dev/null #*/
MADEDIRS=
mkdir -p libc/nt/kernel32 &&
touch libc/nt/kernel32/boop.s &&
rm -f libc/nt/*/*.s ||
exit
imp() {
NAME="$1"
ACTUAL="$2"
DLL="$3"
HINT="$4"
ARITY="$5"
if [ "$MADEDIRS" != "${MADEDIRS#*$3}" ]; then # ← sre interview question
mkdir -p "libc/nt/$3"
MADEDIRS="$MADEDIRS $3"
fi
{
# Generate Portable Executable import data structures
if [ "$DLL" = "ntdll" ]; then
echo ".include \"o/libc/nt/ntdllimport.inc\""
echo ".ntimp $ACTUAL"
else
echo ".include \"o/libc/nt/codegen.inc\""
echo ".imp $DLL,__imp_$ACTUAL,$ACTUAL,$HINT"
fi
# Generate System Five ABI translating thunks
if [ -n "$NAME" ]; then
case "$ARITY" in
0) thunk0 "$NAME" "$ACTUAL" "$NAME" ;;
1) thunk1 "$NAME" "$ACTUAL" "$NAME" ;;
2|3|4) thunk "$NAME" "$ACTUAL" __sysv2nt "$NAME" ;;
5|6) thunk "$NAME" "$ACTUAL" __sysv2nt6 "$NAME" ;;
7|8) thunk "$NAME" "$ACTUAL" __sysv2nt8 "$NAME" ;;
9|10) thunk "$NAME" "$ACTUAL" __sysv2nt10 "$NAME" ;;
11|12) thunk "$NAME" "$ACTUAL" __sysv2nt12 "$NAME" ;;
13|14) thunk "$NAME" "$ACTUAL" __sysv2nt14 "$NAME" ;;
esac
fi
} >libc/nt/$DLL/$ACTUAL.s
}
thunk() {
printf '
.text.windows
%s:
push %%rbp
mov %%rsp,%%rbp
.profilable
mov __imp_%s(%%rip),%%rax
jmp %s
.endfn %s,globl
.previous
' "$@"
}
thunk0() {
printf '
.text.windows
%s:
push %%rbp
mov %%rsp,%%rbp
.profilable
sub $32,%%rsp
call *__imp_%s(%%rip)
leave
ret
.endfn %s,globl
.previous
' "$@"
}
thunk1() {
printf '
.text.windows
%s:
push %%rbp
mov %%rsp,%%rbp
.profilable
mov %%rdi,%%rcx
sub $32,%%rsp
call *__imp_%s(%%rip)
leave
ret
.endfn %s,globl
.previous
' "$@"
}