#!/bin/sh
# Host objcopy lacks the riscv backend.  Force the generic elf64-little
# reader so it can parse the input, then restore e_machine/e_flags in
# the output (which objcopy writes as EM_NONE) from the input file.
#
# Kernel objcopy invocations are: objcopy [FLAGS] INPUT OUTPUT
# (cmd_objcopy in scripts/Makefile.lib).  The last two args are always
# the in/out files.

in=""
out=""
for a; do
	case "$a" in
	-*) ;;
	*)  in=$out; out=$a ;;
	esac
done

/usr/bin/objcopy -I elf64-little "$@" || exit $?

# If output is ELF, restore e_machine (0x12, 2 bytes) and e_flags
# (0x30, 4 bytes) from the input so lld recognises it as riscv.
if [ -n "$in" ] && [ -f "$in" ] && [ -f "$out" ] && \
   [ "$(head -c4 "$out" 2>/dev/null)" = "$(printf '\177ELF')" ]; then
	dd if="$in" of="$out" bs=1 skip=18 seek=18 count=2 conv=notrunc 2>/dev/null
	dd if="$in" of="$out" bs=1 skip=48 seek=48 count=4 conv=notrunc 2>/dev/null
fi
exit 0