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#!/bin/sh
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
trap "rm -f arch_GOARCH.h defs_GOOS_GOARCH.h os_GOOS.h signals_GOOS.h" EXIT INT TERM
set -e
SYS=$1
export GOOS=$(echo $SYS | sed 's/_.*//')
export GOARCH=$(echo $SYS | sed 's/.*_//')
shift
case "$GOARCH" in
386) CC=8c;;
amd64) CC=6c;;
arm) CC=5c;;
esac
CC="$GOROOT/bin/tool/$CC"
export CC
export CFLAGS="-Dos_$GOOS -Darch_$GOARCH"
cp arch_$GOARCH.h arch_GOARCH.h
cp defs_${GOOS}_$GOARCH.h defs_GOOS_GOARCH.h
cp os_$GOOS.h os_GOOS.h
cp signals_$GOOS.h signals_GOOS.h
cat <<'EOF'
// Assembly constants.
// AUTO-GENERATED by autogen.sh; DO NOT EDIT
EOF
if [ ! -x "$CC" ]; then
echo "// dummy file for cmd/go to correctly generate buildscript"
exit
fi
case "$GOARCH" in
386)
# The offsets 0 and 4 are also known to:
# ../../cmd/8l/pass.c:/D_GS
# cgo/gcc_linux_386.c:/^threadentry
# cgo/gcc_darwin_386.c:/^threadentry
case "$GOOS" in
windows)
echo '#define get_tls(r) MOVL 0x14(FS), r'
echo '#define g(r) 0(r)'
echo '#define m(r) 4(r)'
;;
plan9)
echo '#define get_tls(r) MOVL _tos(SB), r '
echo '#define g(r) -8(r)'
echo '#define m(r) -4(r)'
;;
linux)
# On Linux systems, what we call 0(GS) and 4(GS) for g and m
# turn into %gs:-8 and %gs:-4 (using gcc syntax to denote
# what the machine sees as opposed to 8l input).
# 8l rewrites 0(GS) and 4(GS) into these.
#
# On Linux Xen, it is not allowed to use %gs:-8 and %gs:-4
# directly. Instead, we have to store %gs:0 into a temporary
# register and then use -8(%reg) and -4(%reg). This kind
# of addressing is correct even when not running Xen.
#
# 8l can rewrite MOVL 0(GS), CX into the appropriate pair
# of mov instructions, using CX as the intermediate register
# (safe because CX is about to be written to anyway).
# But 8l cannot handle other instructions, like storing into 0(GS),
# which is where these macros come into play.
# get_tls sets up the temporary and then g and r use it.
#
# The final wrinkle is that get_tls needs to read from %gs:0,
# but in 8l input it's called 8(GS), because 8l is going to
# subtract 8 from all the offsets, as described above.
echo '#define get_tls(r) MOVL 8(GS), r'
echo '#define g(r) -8(r)'
echo '#define m(r) -4(r)'
;;
*)
echo '#define get_tls(r)'
echo '#define g(r) 0(GS)'
echo '#define m(r) 4(GS)'
;;
esac
;;
amd64)
case "$GOOS" in
windows)
echo '#define get_tls(r) MOVQ 0x28(GS), r'
echo '#define g(r) 0(r)'
echo '#define m(r) 8(r)'
;;
*)
# The offsets 0 and 8 are known to:
# ../../cmd/6l/pass.c:/D_GS
# cgo/gcc_linux_amd64.c:/^threadentry
# cgo/gcc_darwin_amd64.c:/^threadentry
#
echo '#define get_tls(r)'
echo '#define g(r) 0(GS)'
echo '#define m(r) 8(GS)'
;;
esac
;;
arm)
echo '#define g R10'
echo '#define m R9'
echo '#define LR R14'
;;
*)
echo 'unknown $GOARCH: '$GOARCH 1>&2
exit 1
;;
esac
echo
"$CC" $CFLAGS -a proc.c |
awk '
{ gsub(/\r/, ""); }
/^aggr G$/ { aggr="g" }
/^aggr M$/ { aggr = "m" }
/^aggr Gobuf$/ { aggr = "gobuf" }
/^aggr WinCall$/ { aggr = "wincall" }
/^}/ { aggr = "" }
# Gobuf 24 sched;
# 'Y' 48 stack0;
# 'Y' 56 entry;
# 'A' G 64 alllink;
aggr != "" && /^ / {
name=$NF;
sub(/;/, "", name);
offset=$(NF-1);
printf("#define %s_%s %s\n", aggr, name, offset);
}
'
|
