From: Wolfgang Denk Date: Mon, 17 Aug 2009 11:17:29 +0000 (+0200) Subject: ARM: compiler options cleanup - improve tool chain support X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f772acf8a584067033eff1e231fcd1fb3a00d3d9;p=project%2Fbcm63xx%2Fu-boot.git ARM: compiler options cleanup - improve tool chain support For some time there have been repeated reports about build problems with some ARM (cross) tool chains. Especially issues about (in)compatibility with the tool chain provided runtime support library libgcc.a caused to add and support a private implementation of such runtime support code in U-Boot. A closer look at the code indicated that some of these issues are actually home-made. This patch attempts to clean up some of the most obvious problems and make building of U-Boot with different tool chains easier: - Even though all ARM systems basicy used the same compiler options to select a specific ABI from the tool chain, the code for this was distributed over all cpu/*/config.mk files. We move this one level up into lib_arm/config.mk instead. - So far, we only checked if "-mapcs-32" was supported by the tool chain; if yes, this was used, if not, "-mabi=apcs-gnu" was selected, no matter if the tool chain actually understood this option. There was no support for EABI conformant tool chains. This patch implements the following logic: 1) If the tool chain supports "-mabi=aapcs-linux -mno-thumb-interwork" we use these options (EABI conformant tool chain). 2) Otherwise, we check first if "-mapcs-32" is supported, and then check for "-mabi=apcs-gnu" If one test succeeds, we use the first found option. 3) In case 2), we also test if "-mno-thumb-interwork", and use this if the test succeeds. [For "-mabi=aapcs-linux" we set "-mno-thumb-interwork" mandatorily.] This way we use a similar logic for the compile options as the Linux kernel does. - Some EABI conformant tool chains cause external references to utility functions like raise(); such functions are provided in the new file lib_arm/eabi_compat.c Note that lib_arm/config.mk gets parsed several times, so we must make sure to add eabi_compat.o only once to the linker list. Signed-off-by: Wolfgang Denk Cc: Jean-Christophe PLAGNIOL-VILLARD Cc: Dirk Behme Cc: Magnus Lilja Cc: Tom Rix Cc: Prafulla Wadaskar Acked-by: Sergey Kubushyn Tested-by: Magnus Lilja Tested-by: Andrzej Wolski Tested-by: Gaye Abdoulaye Walsimou Tested-by: Tom Rix Tested-by: Jean-Christophe PLAGNIOL-VILLARD --- diff --git a/config.mk b/config.mk index fd56621fef..0c6d1d1aa7 100644 --- a/config.mk +++ b/config.mk @@ -86,7 +86,7 @@ ifdef ARCH sinclude $(TOPDIR)/lib_$(ARCH)/config.mk # include architecture dependend rules endif ifdef CPU -sinclude $(TOPDIR)/cpu/$(CPU)/config.mk # include CPU specific rules +sinclude $(TOPDIR)/cpu/$(CPU)/config.mk # include CPU specific rules endif ifdef SOC sinclude $(TOPDIR)/cpu/$(CPU)/$(SOC)/config.mk # include SoC specific rules diff --git a/cpu/arm1136/config.mk b/cpu/arm1136/config.mk index 295e8a5b87..61d5a382ed 100644 --- a/cpu/arm1136/config.mk +++ b/cpu/arm1136/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm1176/config.mk b/cpu/arm1176/config.mk index d2f057bf74..a31c7b0f89 100644 --- a/cpu/arm1176/config.mk +++ b/cpu/arm1176/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5t # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm1176/s3c64xx/config.mk b/cpu/arm1176/s3c64xx/config.mk index 4f3b66c5d7..a31c7b0f89 100644 --- a/cpu/arm1176/s3c64xx/config.mk +++ b/cpu/arm1176/s3c64xx/config.mk @@ -30,5 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5t # Supply options according to compiler version # # ========================================================================= -#PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm720t/config.mk b/cpu/arm720t/config.mk index 3cae1dc8f7..74d52831ed 100644 --- a/cpu/arm720t/config.mk +++ b/cpu/arm720t/config.mk @@ -31,6 +31,4 @@ PLATFORM_CPPFLAGS += -march=armv4 -mtune=arm7tdmi # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm920t/config.mk b/cpu/arm920t/config.mk index 5d8a10ff62..a43b156711 100644 --- a/cpu/arm920t/config.mk +++ b/cpu/arm920t/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv4 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm925t/config.mk b/cpu/arm925t/config.mk index 5d8a10ff62..a43b156711 100644 --- a/cpu/arm925t/config.mk +++ b/cpu/arm925t/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv4 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm926ejs/config.mk b/cpu/arm926ejs/config.mk index 885d5c134e..90eb3c0ede 100644 --- a/cpu/arm926ejs/config.mk +++ b/cpu/arm926ejs/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5te # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm926ejs/davinci/config.mk b/cpu/arm926ejs/davinci/config.mk index a57d03aa01..7757be398a 100644 --- a/cpu/arm926ejs/davinci/config.mk +++ b/cpu/arm926ejs/davinci/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5te # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm946es/config.mk b/cpu/arm946es/config.mk index 9d62ba8e3f..a81321bd3c 100644 --- a/cpu/arm946es/config.mk +++ b/cpu/arm946es/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv4 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/arm_cortexa8/config.mk b/cpu/arm_cortexa8/config.mk index 3bfe3db20c..da5ee162c5 100644 --- a/cpu/arm_cortexa8/config.mk +++ b/cpu/arm_cortexa8/config.mk @@ -30,6 +30,5 @@ PLATFORM_CPPFLAGS += -march=armv5 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,\ $(call cc-option,-malignment-traps,)) diff --git a/cpu/arm_cortexa8/omap3/board.c b/cpu/arm_cortexa8/omap3/board.c index 233728762f..b8bd0524af 100644 --- a/cpu/arm_cortexa8/omap3/board.c +++ b/cpu/arm_cortexa8/omap3/board.c @@ -297,13 +297,6 @@ int dram_init(void) return 0; } -/****************************************************************************** - * Dummy function to handle errors for EABI incompatibility - *****************************************************************************/ -void raise(void) -{ -} - /****************************************************************************** * Dummy function to handle errors for EABI incompatibility *****************************************************************************/ diff --git a/cpu/arm_intcm/config.mk b/cpu/arm_intcm/config.mk index 9d62ba8e3f..a81321bd3c 100644 --- a/cpu/arm_intcm/config.mk +++ b/cpu/arm_intcm/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv4 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/ixp/config.mk b/cpu/ixp/config.mk index a71a20b822..2c33b40a2c 100644 --- a/cpu/ixp/config.mk +++ b/cpu/ixp/config.mk @@ -33,5 +33,4 @@ PLATFORM_CPPFLAGS += -mbig-endian -march=armv5te -mtune=strongarm1100 # Supply options according to compiler version # # ========================================================================= -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/lh7a40x/config.mk b/cpu/lh7a40x/config.mk index c0e7a1d044..27bc481260 100644 --- a/cpu/lh7a40x/config.mk +++ b/cpu/lh7a40x/config.mk @@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv4 # Supply options according to compiler version # # ======================================================================== -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/pxa/config.mk b/cpu/pxa/config.mk index af910e2f67..f360478d0c 100644 --- a/cpu/pxa/config.mk +++ b/cpu/pxa/config.mk @@ -31,6 +31,4 @@ PLATFORM_CPPFLAGS += -march=armv5te -mtune=xscale # Supply options according to compiler version # # ======================================================================== -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/s3c44b0/config.mk b/cpu/s3c44b0/config.mk index 01e7040d61..3623f2503e 100644 --- a/cpu/s3c44b0/config.mk +++ b/cpu/s3c44b0/config.mk @@ -31,6 +31,4 @@ PLATFORM_CPPFLAGS += -march=armv4 -mtune=arm7tdmi -msoft-float # Supply options according to compiler version # # ======================================================================== -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/cpu/sa1100/config.mk b/cpu/sa1100/config.mk index 9ef4a19d33..553cd0c9cf 100644 --- a/cpu/sa1100/config.mk +++ b/cpu/sa1100/config.mk @@ -31,6 +31,4 @@ PLATFORM_CPPFLAGS += -march=armv4 -mtune=strongarm1100 # Supply options according to compiler version # # ======================================================================== -PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) -PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,) PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) diff --git a/lib_arm/Makefile b/lib_arm/Makefile index c37e2e0d8a..02933485cd 100644 --- a/lib_arm/Makefile +++ b/lib_arm/Makefile @@ -51,12 +51,21 @@ OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y)) LGOBJS := $(addprefix $(obj),$(GLSOBJS)) \ $(addprefix $(obj),$(GLCOBJS)) +# Always build libarm.a +TARGETS := $(LIB) + +# Build private libgcc only when asked for ifdef USE_PRIVATE_LIBGCC -all: $(LIB) $(LIBGCC) -else -all: $(LIB) +TARGETS += $(LIBGCC) +endif + +# For EABI conformant tool chains, provide eabi_compat() +ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) +TARGETS += $(obj)eabi_compat.o endif +all: $(TARGETS) + $(LIB): $(obj).depend $(OBJS) $(AR) $(ARFLAGS) $@ $(OBJS) diff --git a/lib_arm/config.mk b/lib_arm/config.mk index a13603e409..705dfc306c 100644 --- a/lib_arm/config.mk +++ b/lib_arm/config.mk @@ -25,4 +25,32 @@ CROSS_COMPILE ?= arm-linux- PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__ +# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb: +PLATFORM_CPPFLAGS += $(call cc-option,-marm,) + +# Try if EABI is supported, else fall back to old API, +# i. e. for example: +# - with ELDK 4.2 (EABI supported), use: +# -mabi=aapcs-linux -mno-thumb-interwork +# - with ELDK 4.1 (gcc 4.x, no EABI), use: +# -mabi=apcs-gnu -mno-thumb-interwork +# - with ELDK 3.1 (gcc 3.x), use: +# -mapcs-32 -mno-thumb-interwork +PLATFORM_CPPFLAGS += $(call cc-option,\ + -mabi=aapcs-linux -mno-thumb-interwork,\ + $(call cc-option,\ + -mapcs-32,\ + $(call cc-option,\ + -mabi=apcs-gnu,\ + )\ + ) $(call cc-option,-mno-thumb-interwork,)\ + ) + +# For EABI, make sure to provide raise() +ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) +# This file is parsed several times; make sure to add only once. +ifeq (,$(findstring lib_arm/eabi_compat.o,$(PLATFORM_LIBS))) +PLATFORM_LIBS += $(OBJTREE)/lib_arm/eabi_compat.o +endif +endif LDSCRIPT := $(SRCTREE)/cpu/$(CPU)/u-boot.lds diff --git a/lib_arm/eabi_compat.c b/lib_arm/eabi_compat.c new file mode 100644 index 0000000000..86eacf1b0e --- /dev/null +++ b/lib_arm/eabi_compat.c @@ -0,0 +1,18 @@ +/* + * Utility functions needed for (some) EABI conformant tool chains. + * + * (C) Copyright 2009 Wolfgang Denk + * + * This program is Free Software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + */ + +#include + +int raise (int signum) +{ + printf("raise: Signal # %d caught\n", signum); + return 0; +}