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@@ -8,30 +8,80 @@ CC=${CC:-gcc}
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# endianess of target (automagically determined below)
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ENDIAN=
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-# don't do this if ELF format isn't used. it doesn't matter since offsets are
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-# only needed for the asm parts (currently mips/arm32) and those have ELF
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-check_elf ()
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+# check which object format to dissect
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+READELF=
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+OBJDUMP=
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+check_obj ()
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{
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+ # prepare an object file; as side effect dtermine the endianess
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+ CROSS=$(echo $CC | sed 's/gcc.*//')
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echo '#include <stdint.h>' >/tmp/getoffs.c
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echo "const int32_t val = 1;" >>/tmp/getoffs.c
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$CC $CFLAGS -I .. -c /tmp/getoffs.c -o /tmp/getoffs.o || exit 1
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- if ! command -v readelf >/dev/null || ! file /tmp/getoffs.o | grep -q ELF; then
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- echo "/* mkoffset.sh: no readelf or not ELF, offset table not created */" >$fn
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- echo "WARNING: no readelf or not ELF, offset table not created"
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- exit
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+
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+ # check for readelf; readelf is the only toolchain tool not using bfd,
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+ # hence it works with ELF files for every target
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+ if file /tmp/getoffs.o | grep -q ELF; then
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+ if command -v readelf >/dev/null; then
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+ READELF=readelf
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+ elif command -v ${CROSS}readelf >/dev/null; then
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+ READELF=${CROSS}readelf
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+ fi
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+ fi
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+ if [ -n "$READELF" ]; then
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+ # find the the .rodata section (in case -fdata-sections is used)
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+ rosect=$($READELF -S /tmp/getoffs.o | grep '\.rodata\|\.sdata' |
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+ sed 's/^[^.]*././;s/ .*//')
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+ # read .rodata section as hex string (should be only 4 bytes)
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+ ro=$($READELF -x $rosect /tmp/getoffs.o | grep '0x' | cut -c14-48 |
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+ tr -d ' \n' | cut -c1-8)
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+ # if no output could be read readelf isn't working
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+ if [ -z "$ro" ]; then
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+ READELF=
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+ fi
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+ fi
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+ # if there is no working readelf try using objdump
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+ if [ -z "$READELF" ]; then
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+ # objdump is using bfd; try using the toolchain objdump first
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+ # since this is likely working with the toolchain objects
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+ if command -v ${CROSS}objdump >/dev/null; then
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+ OBJDUMP=${CROSS}objdump
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+ elif command -v objdump >/dev/null; then
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+ OBJDUMP=objdump
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+ fi
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+ # find the start line of the .rodata section; read the next line
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+ ro=$($OBJDUMP -s /tmp/getoffs.o | awk '\
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+ /Contents of section.*(__const|.rodata|.sdata)/ {o=1; next} \
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+ {if(o) { gsub(/ .*/,""); $1=""; gsub(/ /,""); print; o=0}}')
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+ # no working tool for extracting the ro data; stop here
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+ if [ -z "$ro" ]; then
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+ echo "/* mkoffset.sh: no readelf or not ELF, offset table not created */" >$fn
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+ echo "WARNING: no readelf or not ELF, offset table not created"
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+ exit
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+ fi
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fi
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+ # extract decimal value from ro
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+ rodata=$(printf "%d" 0x$ro)
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+ ENDIAN=$(if [ "$rodata" -eq 1 ]; then echo be; else echo le; fi)
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}
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# compile with target C compiler and extract value from .rodata section
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compile_rodata ()
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{
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$CC $CFLAGS -I .. -c /tmp/getoffs.c -o /tmp/getoffs.o || exit 1
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- # find the name of the .rodata section (in case -fdata-sections is used)
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- rosect=$(readelf -S /tmp/getoffs.o | grep '\.rodata\|\.sdata' |
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+ if [ -n "$READELF" ]; then
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+ # find the .rodata section (in case -fdata-sections is used)
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+ rosect=$(readelf -S /tmp/getoffs.o | grep '\.rodata\|\.sdata' |
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sed 's/^[^.]*././;s/ .*//')
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- # read out .rodata section as hex string (should be only 4 bytes)
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- ro=$(readelf -x $rosect /tmp/getoffs.o | grep '0x' | cut -c14-48 |
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+ # read .rodata section as hex string (should be only 4 bytes)
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+ ro=$(readelf -x $rosect /tmp/getoffs.o | grep '0x' | cut -c14-48 |
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tr -d ' \n' | cut -c1-8)
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+ elif [ -n "$OBJDUMP" ]; then
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+ # find the start line of the .rodata section; read the next line
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+ ro=$($OBJDUMP -s /tmp/getoffs.o | awk '\
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+ /Contents of section.*(__const|.rodata|.sdata)/ {o=1; next} \
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+ {if(o) { gsub(/ .*/,""); $1=""; gsub(/ /,""); print; o=0}}')
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+ fi
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if [ "$ENDIAN" = "le" ]; then
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# swap needed for le target
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hex=""
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@@ -63,12 +113,7 @@ get_define () # prefix struct member member...
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fn="${1:-.}/pico_int_offs.h"
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if echo $CFLAGS | grep -qe -flto; then CFLAGS="$CFLAGS -fno-lto"; fi
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-check_elf
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-# determine endianess
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-echo '#include <stdint.h>' >/tmp/getoffs.c
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-echo "const int32_t val = 1;" >>/tmp/getoffs.c
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-compile_rodata
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-ENDIAN=$(if [ "$rodata" -eq 1 ]; then echo be; else echo le; fi)
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+check_obj
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# output header
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echo "/* autogenerated by mkoffset.sh, do not edit */" >$fn
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echo "/* target endianess: $ENDIAN, compiled with: $CC $CFLAGS */" >>$fn
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