summaryrefslogtreecommitdiff
path: root/arch/mips/config.mk
AgeCommit message (Collapse)Author
2017-07-25MIPS: Stop building position independent codePaul Burton
U-Boot has up until now built with -fpic for the MIPS architecture, producing position independent code which uses indirection through a global offset table, making relocation fairly straightforward as it simply involves patching up GOT entries. Using -fpic does however have some downsides. The biggest of these is that generated code is bloated in various ways. For example, function calls are indirected through the GOT & the t9 register: 8f998064 lw t9,-32668(gp) 0320f809 jalr t9 Without -fpic the call is simply: 0f803f01 jal be00fc04 <puts> This is more compact & faster (due to the lack of the load & the dependency the jump has on its result). It is also easier to read & debug because the disassembly shows what function is being called, rather than just an offset from gp which would then have to be looked up in the ELF to discover the target function. Another disadvantage of -fpic is that each function begins with a sequence to calculate the value of the gp register, for example: 3c1c0004 lui gp,0x4 279c3384 addiu gp,gp,13188 0399e021 addu gp,gp,t9 Without using -fpic this sequence no longer appears at the start of each function, reducing code size considerably. This patch switches U-Boot from building with -fpic to building with -fno-pic, in order to gain the benefits described above. The cost of this is an extra step during the build process to extract relocation data from the ELF & write it into a new .rel section in a compact format, plus the added complexity of dealing with multiple types of relocation rather than the single type that applied to the GOT. The benefit is smaller, cleaner, more debuggable code. The relocate_code() function is reimplemented in C to handle the new relocation scheme, which also makes it easier to read & debug. Taking maltael_defconfig as an example the size of u-boot.bin built using the Codescape MIPS 2016.05-06 toolchain (gcc 4.9.2, binutils 2.24.90) shrinks from 254KiB to 224KiB. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: u-boot@lists.denx.de Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Tested-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2017-05-10MIPS: add support for generating u-boot.elfÁlvaro Fernández Rojas
Define PLATFORM_ELFFLAGS for MIPS in order to be able to generate u-boot.elf Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2016-05-31MIPS: provide a default u-boot-spl.ldsDaniel Schwierzeck
Provide a default linker script for SPL binaries. Start address and size of text section and BSS section are configurable. All sections are arranged in a way that only relevant sections are kept in the code section for maximum size reduction. All other sections are kept but moved outside the code section to help with debugging. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Acked-by: Marek Vasut <marex@denx.de>
2016-01-16MIPS: Kconfig: optimize gcc -march and -mtune setupDaniel Schwierzeck
Move setup of -march to arch/mips/Makefile and follow the design on ARM. Also add a possibility to chose specific CPU tune options. Signed-off-by: Wills Wang <wills.wang@live.com> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2016-01-16MIPS: add initial infrastructure for device-tree filesDaniel Schwierzeck
Prepare sub-folder for device-tree files. Make support for device-tree on MIPS available in Kbuild/Kconfig. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
2016-01-16MIPS: do not build position-independent executables for SPLDaniel Schwierzeck
SPL binaries are usually linked to a fixed address in SRAM. Furthermore SPL binaries do not need to relocate itself. Thus do not build them as position-independent binaries which helps to largely reduce the size of SPL binaries. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2015-03-28generic-board: move __HAVE_ARCH_GENERIC_BOARD to KconfigMasahiro Yamada
Move the option to Kconfig renaming it to CONFIG_HAVE_GENERIC_BOARD. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Alexey Brodkin <abrodkin@synopsys.com>
2014-11-01MIPS: add .padding section to linker scriptDaniel Schwierzeck
Commit 79fd7e649e287228a1445820a72f7dd33baedb96 MIPS: always keep all sections in u-boot ELF binary. Always keep all sections in u-boot ELF binary. Move all unneeded sections after _end to avoid allocating space in the final binary. Also remove .deadcode section which is now obsolete. removed section .deadcode because the original symptoms were not visible anymore. Unfortuneatly the binutils bug still exists. The size of .rel.dyn section is often bigger than needed for all entries. But objcopy only allocates space as much as required for all reloc entries. Thus there is a gap between the last entry and __rel_dyn_end in u-boot.bin. If u-boot is booted from RAM (e.g. in SPL scenarios) that area could contain garbage data which could lead to CPU exceptions during relocation. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2014-11-01MIPS: refactor setting of compiler optionsDaniel Schwierzeck
Refactor and unify all compiler settings in arch/mips/config.mk. Also add tune flags for each supported CPU type. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2014-07-30kconfig: delete redundant CONFIG_${ARCH} definitionMasahiro Yamada
CONFIG_${ARCH} is defined by Kconfig. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2014-04-20MIPS: allow use of generic boardPaul Burton
This patch allows MIPS boards to make use of generic board, replacing arch/mips/lib/board.c with common/board_{f,r}.c and struct bd_info with the asm-generic version. Signed-off-by: Paul Burton <paul.burton@imgtec.com>
2014-04-20MIPS: always keep all sections in u-boot ELF binary.Daniel Schwierzeck
Always keep all sections in u-boot ELF binary. Move all unneeded sections after _end to avoid allocating space in the final binary. Also remove .deadcode section which is now obsolete. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2014-03-04kbuild: fix CROSS_COMPILE settings in config.mkMasahiro Yamada
The syntax CROSS_COMIPLE ?= <cross_compiler_prefix> does not work because config.mk is parsed after exporting CROSS_COMPILE. Like Linux Kernel's arch/$(ARCH)/Makefile, we must write as follows: ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := <cross_compiler_prefix> endif Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
2014-02-25kbuild: rename OBJCFLAGS to OBJCOPYFLAGSMasahiro Yamada
Rename OBJCFLAGS to OBJCOPYFLAGS beforehand to use "cmd_objcopy" in scripts/Makefile.lib in an upcoming commit. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
2013-07-24Add GPL-2.0+ SPDX-License-Identifier to source filesWolfgang Denk
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
2013-02-12MIPS: add dynamic relocation supportGabor Juhos
The code handles relocation entries with the following relocation types only: mips32: R_MIPS_REL32 mips64: R_MIPS_REL+R_MIPS_64 xburst: R_MIPS_REL32 Other relocation entries are skipped without processing. The code must be extended if other relocation types must be supported. Add -pie to LDFLAGS_FINAL to generate the .rel.dyn fixup table, which will be applied to the relocated image before transferring control to it. The CONFIG_NEEDS_MANUAL_RELOC is not needed after the patch, so remove that as well. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2012-08-24MIPS: move CONFIG_STANDALONE_LOAD_ADDR to CPU config makefilesDaniel Schwierzeck
Prepare for upcoming MIPS64 CPU support. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2012-08-24MIPS: factor out endianess flag handling to arch config.mkDaniel Schwierzeck
This is CPU independent and should be configured architecture-wide. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2011-05-10MIPS: Introduce --gc-sections for MIPSDaniel Schwierzeck
All architectures but MIPS are using --gc-sections on final linking. This patch introduces that feature for MIPS to reduce the memory and flash footprint. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Stefan Roese <sr@denx.de> Cc: Thomas Lange <thomas@corelatus.se> Cc: Vlad Lungu <vlad.lungu@windriver.com> Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
2011-04-12Make STANDALONE_LOAD_ADDR configurable per boardWolfgang Denk
Rename STANDALONE_LOAD_ADDR into CONFIG_STANDALONE_LOAD_ADDR and allow that the architecture-specific default value gets overwritten by defining the value in the board header file. Signed-off-by: Wolfgang Denk <wd@denx.de> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp> Cc: Daniel Hellstrom <daniel@gaisler.com> Cc: Tsi Chung Liew <tsi-chung.liew@freescale.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2010-04-13Move lib_$ARCH directories to arch/$ARCH/libPeter Tyser
Also move lib_$ARCH/config.mk to arch/$ARCH/config.mk This change is intended to clean up the top-level directory structure and more closely mimic Linux's directory organization. Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
generated by cgit (git 2.34.1) at 2024-12-28 06:44:27 +0000