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 <wd@denx.de>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Dirk Behme <dirk.behme@googlemail.com>
Cc: Magnus Lilja <lilja.magnus@gmail.com>
Cc: Tom Rix <Tom.Rix@windriver.com>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-by: Sergey Kubushyn <ksi@koi8.net>
Tested-by: Magnus Lilja <lilja.magnus@gmail.com>
Tested-by: Andrzej Wolski <awolski@poczta.fm>
Tested-by: Gaye Abdoulaye Walsimou <walsimou@walsimou.com>
Tested-by: Tom Rix <Tom.Rix@windriver.com>
Tested-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

21 files changed, 59 insertions, 40 deletions

diff --git a/config.mk b/config.mk
index fd56621..0c6d1d1 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)/$(SOC)/config.mk	# include  SoC	specific rules
diff --git a/cpu/arm1136/config.mk b/cpu/arm1136/config.mk
index 295e8a5..61d5a38 100644
--- a/cpu/arm1136/config.mk
+++ b/cpu/arm1136/config.mk
@@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5
 # Supply options according to compiler version
 #
 # =========================================================================
-PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
-PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,)
 PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
diff --git a/cpu/arm1176/config.mk b/cpu/arm1176/config.mk
index d2f057b..a31c7b0 100644
--- a/cpu/arm1176/config.mk
+++ b/cpu/arm1176/config.mk
@@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5t
 # Supply options according to compiler version
 #
 # =========================================================================
-PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
-PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,)
 PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
diff --git a/cpu/arm1176/s3c64xx/config.mk b/cpu/arm1176/s3c64xx/config.mk
index 4f3b66c..a31c7b0 100644
--- a/cpu/arm1176/s3c64xx/config.mk
+++ b/cpu/arm1176/s3c64xx/config.mk
@@ -30,5 +30,4 @@ PLATFORM_CPPFLAGS += -march=armv5t
 # Supply options according to compiler version
 #
 # =========================================================================
-#PLATFORM_CPPFLAGS +=$(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 3cae1dc..74d5283 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 5d8a10f..a43b156 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 5d8a10f..a43b156 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 885d5c1..90eb3c0 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 a57d03a..7757be3 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 9d62ba8..a81321b 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 3bfe3db..da5ee16 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,\
 		    $(call cc-option,-malignment-traps,))
diff --git a/cpu/arm_cortexa8/omap3/board.c b/cpu/arm_cortexa8/omap3/board.c
index 2337287..b8bd052 100644
--- a/cpu/arm_cortexa8/omap3/board.c
+++ b/cpu/arm_cortexa8/omap3/board.c
@@ -300,13 +300,6 @@ int dram_init(void)
 /******************************************************************************
  * Dummy function to handle errors for EABI incompatibility
  *****************************************************************************/
-void raise(void)
-{
-}
-
-/******************************************************************************
- * Dummy function to handle errors for EABI incompatibility
- *****************************************************************************/
 void abort(void)
 {
 }
diff --git a/cpu/arm_intcm/config.mk b/cpu/arm_intcm/config.mk
index 9d62ba8..a81321b 100644
--- a/cpu/arm_intcm/config.mk
+++ b/cpu/arm_intcm/config.mk
@@ -30,6 +30,4 @@ PLATFORM_CPPFLAGS +=  -march=armv4
 # Supply options according to compiler version
 #
 # =========================================================================
-PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
-PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,)
 PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
diff --git a/cpu/ixp/config.mk b/cpu/ixp/config.mk
index a71a20b..2c33b40 100644
--- a/cpu/ixp/config.mk
+++ b/cpu/ixp/config.mk
@@ -33,5 +33,4 @@ PLATFORM_CPPFLAGS += -mbig-endian -march=armv5te -mtune=strongarm1100
 # Supply options according to compiler version
 #
 # =========================================================================
-PLATFORM_CPPFLAGS +=$(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 c0e7a1d..27bc481 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 af910e2..f360478 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 01e7040..3623f25 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 9ef4a19..553cd0c 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 c37e2e0..0293348 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 a13603e..705dfc3 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 0000000..86eacf1
--- /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 <wd@denx.de>
+ *
+ * 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 <common.h>
+
+int raise (int signum)
+{
+	printf("raise: Signal # %d caught\n", signum);
+	return 0;
+}