diff options
Diffstat (limited to 'usr/klibc/arch/x86_64/MCONFIG')
| -rw-r--r-- | usr/klibc/arch/x86_64/MCONFIG | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/usr/klibc/arch/x86_64/MCONFIG b/usr/klibc/arch/x86_64/MCONFIG new file mode 100644 index 0000000..70d690e --- /dev/null +++ b/usr/klibc/arch/x86_64/MCONFIG @@ -0,0 +1,43 @@ +# -*- 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 |