contiki/cpu/x86/Makefile.x86_common
Michael LeMay f85654a82f x86, galileo: Add UEFI support
This patch adds support for optionally building EFI binaries in
addition to Multiboot ELF binaries.  It includes a script,
build_uefi.sh, that downloads tool and library sources from the EDK II
project, builds the GenFw tool that is used to create UEFI binaries,
and creates a makefile that is included from the main x86 common
makefile and enables UEFI support in the Contiki build system.  If the
script is not run prior to building Contiki, then an informational
message will be displayed with instructions for running build_uefi.sh
if UEFI support is desired.  This patch also adds the path to the
auto-generated makefile to .gitignore.

This patch modifies the linker script for the Intel Quark X1000 to
account for the output file section offsets and alignment expectations
of the EDK II GenFw project.

This patch also adds a newlib patch to remove the weak symbol
attribute from floating point stdio support routines.  See
<newlib>/newlib/README for an explanation of how the newlib developers
intended for _printf_float and _scanf_float to be linked.  Newlib
declares them as weak symbols with the intention that developers would
force them to be linked only when needed using a linker command line
option.  However, some but not all Contiki programs require them, so
we cannot simply always include or exclude them.  Instead, we remove
the weak symbol attributes and rely on the linker to automatically
determine whether or not they should be linked.  This avoids an issue
in which weak symbols were undefined in the intermediate DLL generated
as part of the UEFI build process.  That resulted in the GenFw program
emitting "ERROR 3000" messages when it encountered relocations
referencing such an undefined symbol.

Finally, this patch updates README.md to both make some revisions to
account for the UART support introduced in previous patches as well as
to provide instructions for using the UEFI support.
2015-12-21 08:06:14 -02:00

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1.5 KiB
Makefile

CONTIKI_CPU_DIRS += . init/common
CONTIKI_SOURCEFILES += gdt.c helpers.S idt.c cpu.c
CC = gcc
LD = gcc
AS = as
OBJCOPY = objcopy
SIZE = size
STRIP = strip
# Omit exception handling unwind tables (see
# http://wiki.dwarfstd.org/index.php?title=Exception_Handling). Removing these
# tables saves space and has not caused any readily-apparent functional
# changes.
#
# Furthermore, the .eh_frame and .eh_frame_hdr sections that are otherwise
# generated are treated as code sections by the UEFI GenFw program, since they
# are read-only alloc sections. They get grouped with the actual code
# sections, ahead of the data sections. This perturbs symbols and complicates
# debugging.
#
# Synchronize the unwind table options here with the CFLAGS and CXXFLAGS in
# ./bsp/libc/build_newlib.sh.
CFLAGS += -Wall -fno-asynchronous-unwind-tables -fno-unwind-tables
LDFLAGS += -Wl,-Map=contiki-$(TARGET).map,--build-id=none
ifeq ($(BUILD_RELEASE),1)
CFLAGS += -Os -fno-strict-aliasing -ffunction-sections -fdata-sections
# XXX: --gc-sections can be very tricky sometimes. If somehow the release
# binary seems to be broken, check if removing this option fixes the issue.
# Applying the --strip-all option to the UEFI build may induce an "Invalid operation" error.
# The UEFI GenFw program strips symbols.
MULTIBOOT_LDFLAGS += -Wl,--strip-all,--gc-sections
else
CFLAGS += -O0
ifeq ($(findstring clang,$(CC)),clang)
CFLAGS += -g
else
CFLAGS += -ggdb3
endif
endif