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#!/bin/sh
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if [ $# -lt 3 ]; then echo Usage: dummylib.sh orig_lib_path dummy_lib_path mapfile; exit 1; fi
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TMPDIR=`mktemp -d dummylib.sh.XXXXXX` || exit 1
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F=`file -L $1`
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C=
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S=8
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case "$F" in
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*ELF\ 64-bit*shared\ object*x86-64*) C=-m64;;
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*ELF\ 32-bit*shared\ object*80?86*) C=-m32; S=4;;
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*ELF\ 64-bit*shared\ object*PowerPC*) C=-m64;;
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*ELF\ 32-bit*shared\ object*PowerPC*) C=-m32; S=4;;
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*ELF\ 64-bit*shared\ object*cisco*) C=-m64;;
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*ELF\ 32-bit*shared\ object*cisco*) C=-m32; S=4;;
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*ELF\ 64-bit*shared\ object*IA-64*) C=;;
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*ELF\ 64-bit*shared\ object*Alpha*) C=;;
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*ELF\ 64-bit*shared\ object*390*) C=-m64;;
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*ELF\ 32-bit*shared\ object*390*) C=-m31; S=4;;
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*ELF\ 64-bit*shared\ object*SPARC*) C=-m64;;
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*ELF\ 32-bit*shared\ object*SPARC*) C=-m32; S=4;;
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*ELF\ 64-bit*shared\ object*Alpha*) C=;;
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esac
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readelf -Ws $1 | awk '
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/\.dynsym.* contains/ { start=1 }
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/^$/ { start=0 }
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/ WEAK.* UND [^@]*$/ { if (start) {
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print ".data"; print ".weak " $8; print ".balign 8"
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print ".'$S'byte " $8
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} }
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/ UND / { next }
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/@/ { if (start) {
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fn=$8
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intfn="HACK" hack+0
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hack++
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if ($4 ~ /FUNC/) { print ".text"; size=16; print ".type " intfn ",@function" }
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else if ($4 ~ /OBJECT/) { print ".data"; size=$3; print ".type " intfn ",@object" }
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else if ($4 ~ /NOTYPE/) { print ".data"; size=$3 }
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else if ($4 ~ /TLS/) { print ".section .tdata,\"awT\",@progbits"; size=$3; print ".type " intfn ",@object" }
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else exit(1);
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print ".globl " intfn
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if ($5 ~ /WEAK/) { print ".weak " intfn }
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else if ($5 !~ /GLOBAL/) exit(1);
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print intfn ": .skip " size
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print ".size " intfn "," size
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print ".symver " intfn "," fn
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} }
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' > $TMPDIR/lib.s || exit
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soname=`readelf -Wd $1 | grep SONAME | sed 's/^.*\[//;s/\].*$//'`
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gcc $C -Wl,-z,noexecstack -shared -Wl,-soname,$soname,-version-script,$3 \
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-o $2 $TMPDIR/lib.s -nostdlib
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strip $2
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rm -rf $TMPDIR
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