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 <ke...@koconnor.net>
---
Makefile | 9 +++++----
scripts/ldnoexec.py | 32 ++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+), 4 deletions(-)
create mode 100755 scripts/ldnoexec.py
diff --git a/Makefile b/Makefile
index c20be15..3d8943e 100644
--- a/Makefile
+++ b/Makefile
@@ -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 $@"
diff --git a/scripts/ldnoexec.py b/scripts/ldnoexec.py
new file mode 100755
index 0000000..b0b32d4
--- /dev/null
+++ b/scripts/ldnoexec.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python2
+# Script to remove EXEC flag from an ELF file
+#
+# Copyright (C) 2020 Kevin O'Connor <ke...@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import os, optparse, sys
+
+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()
--
2.26.2
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