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HACK: qemu: change e_machine for IAMCU binaries

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For some strange reason IAMCU sets e_machine to 0x06 which causes
QEMU to freak out. This is just x86 code with a different C
calling convention, hack it back to 0x03 (EM_386) before running
under the emulator.

Change-Id: Ia5d51b771cad41f3013eb3d6a17912c8909c9bac
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2016-03-10 16:02:24 -08:00 • committed by Anas Nashif
commit e79c960dd8
2 changed files with 12 additions and 0 deletions
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1
Makefile
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@ -1136,6 +1136,7 @@ endif
qemu: zephyr
$(if $(QEMU_PIPE),,@echo "To exit from QEMU enter: 'CTRL+a, x'")
@echo '[QEMU] CPU: $(QEMU_CPU_TYPE_$(ARCH))'
$(if $(CONFIG_X86_IAMCU),python $(ZEPHYR_BASE)/scripts/qemu-machine-hack.py $(KERNEL_ELF_NAME))
$(Q)$(QEMU) $(QEMU_FLAGS) $(QEMU_EXTRA_FLAGS) -kernel $(KERNEL_ELF_NAME)
-include $(srctree)/boards/$(BOARD_NAME)/Makefile.board

11
scripts/qemu-machine-hack.py Normal file
View file

@ -0,0 +1,11 @@
import sys
# For some baffling reason IAMCU sets the instruction set architecture
# in the ELF header to 0x06 instead of 0x03 even though it is just
# 386 code. This gives QEMU fits. Hack it!
fd = open(sys.argv[1], "r+b")
fd.seek(0x12)
# Write 0x03 which is EM_386 to e_machine
fd.write(b'\x03')
fd.close()