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# -*- makefile -*-
#
# arch/x86-64/MCONFIG
#
# Special rules for this architecture. Note that this is actually
# included from the main Makefile, and that pathnames should be
# accordingly.
#
# Blatantly copied and modified from i386 version by Mats Petersson, AMD.
#
#
# NOTE: -fno-asynchronous-unwind-tables produce significantly smaller
# binaries (20% smaller), but makes the code completely useless for
# debugging using gdb.
#
KLIBCARCHREQFLAGS = -m64
KLIBCOPTFLAGS += -Os -fomit-frame-pointer -mno-sse \
$(call cc-option,-falign-functions=1, ) \
$(call cc-option,-falign-jumps=1, ) \
$(call cc-option,-falign-loops=1, )
ifeq ($(DEBUG),y)
KLIBCOPTFLAGS += -g
else
KLIBCOPTFLAGS += -fno-asynchronous-unwind-tables
endif
KLIBCBITSIZE = 64
KLIBCLDFLAGS = -m elf_x86_64 $(LD_IMAGE_BASE_OPT) 0x00400000
# Extra linkflags when building the shared version of the library
# This address needs to be reachable using normal inter-module
# calls, and work on the memory models for this architecture
# 2 MB - normal binaries start at 4 MB
#
# binutils now uses max-page-size=0x200000 by default, which pushes
# klibc.so data over the 4 MB mark, overlapping the executable.
# The old default was max-page-size=0x100000, but that also results
# in a broken layout with binutils 2.30. Since there's no
# architectural page size betwen 4 KB and 2MB, set it to 4 KB.
KLIBCSHAREDFLAGS = $(LD_IMAGE_BASE_OPT) 0x00200000 -z max-page-size=0x1000
# Kernel has never used stack trampolines
KLIBCEXECSTACK := n
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