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ldnoexec: Add script to remove ET_EXEC flag from intermediate build objects 

Add a script to remove the ET_EXEC flag from the 16bit and "32bit
segmented" intermediate objects.  This avoids build failures with some
linkers that will not allow linking these objects again.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-07-22 11:31:40 -04:00
parent 6ada2285d9
commit 699a4e5d69
2 changed files with 37 additions and 4 deletions
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9
Makefile
View File

@ -127,9 +127,10 @@ $(Q)printf '$(foreach i,$2,#include "$i"\n)' > $3.tmp.c
$(Q)$(CC) -I. $1 $(CFLAGSWHOLE) -c $3.tmp.c -o $3
endef
%.strip.o: %.o
%.noexec.o: %.o
@echo " Stripping $@"
$(Q)$(STRIP) $< -o $@
$(Q)$(STRIP) $< -o $<.strip.o
$(Q)$(PYTHON) ./scripts/ldnoexec.py $<.strip.o $@
$(OUT)%.s: %.c
@echo " Compiling to assembler $@"
@ -185,9 +186,9 @@ $(OUT)rom32seg.o: $(OUT)code32seg.o $(OUT)romlayout32seg.lds
@echo " Linking $@"
$(Q)$(LD) -T $(OUT)romlayout32seg.lds $< -o $@
$(OUT)rom.o: $(OUT)rom16.strip.o $(OUT)rom32seg.strip.o $(OUT)code32flat.o $(OUT)romlayout32flat.lds
$(OUT)rom.o: $(OUT)rom16.noexec.o $(OUT)rom32seg.noexec.o $(OUT)code32flat.o $(OUT)romlayout32flat.lds
@echo " Linking $@"
$(Q)$(LD) -N -T $(OUT)romlayout32flat.lds $(OUT)rom16.strip.o $(OUT)rom32seg.strip.o $(OUT)code32flat.o -o $@
$(Q)$(LD) -N -T $(OUT)romlayout32flat.lds $(OUT)rom16.noexec.o $(OUT)rom32seg.noexec.o $(OUT)code32flat.o -o $@
$(OUT)bios.bin.prep: $(OUT)rom.o scripts/checkrom.py
@echo " Prepping $@"

32
scripts/ldnoexec.py Executable file
View File

@ -0,0 +1,32 @@
#!/usr/bin/env python
# Script to remove EXEC flag from an ELF file
#
# Copyright (C) 2020 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import optparse
FLAG_OFFSET = 16
def main():
# Parse command-line arguments
usage = "%prog <input_file> <output_file>"
opts = optparse.OptionParser(usage)
options, args = opts.parse_args()
if len(args) != 2:
opts.error("Incorrect number of arguments")
infilename, outfilename = args
# Read input
f = open(infilename, "rb")
srcdata = f.read()
f.close()
# Update
outdata = bytearray(srcdata)
outdata[FLAG_OFFSET] = 0x01 # change ET_EXEC to ET_REL
# Write output
f = open(outfilename, "wb")
f.write(outdata)
f.close()
if __name__ == '__main__':
main()