From a65d29225ed884456f3d34dcefd3a18df24af03b Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 8 Jan 2011 16:18:51 +0000 Subject: ARM: add 'uinstall' target for installing uboot kernels We have 'install' and 'zinstall' for installing Image and zImage kernels, so add 'uinstall' to complete the set. This allows developers to have a ~/bin/installkernel script which (eg) copies the kernel to the tftp server automatically once the kernel has built, resulting in a better workflow. Signed-off-by: Russell King --- arch/arm/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/arm/Makefile') diff --git a/arch/arm/Makefile b/arch/arm/Makefile index c22c1adfedd6..da525bc96145 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -280,7 +280,7 @@ bzImage: zImage zImage Image xipImage bootpImage uImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ -zinstall install: vmlinux +zinstall uinstall install: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@ # We use MRPROPER_FILES and CLEAN_FILES now @@ -301,6 +301,7 @@ define archhelp echo ' (supply initrd image via make variable INITRD=)' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' + echo ' uinstall - Install U-Boot wrapped compressed kernel' echo ' Install using (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH) and run lilo' -- cgit v1.2.3 From 6f685c5cdd29649cf8cc8f57c72791159f936e07 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Thu, 3 Mar 2011 11:41:12 +0100 Subject: ARM: 6781/1: Thumb-2: Work around buggy Thumb-2 short branch relocations in gas Various binutils versions can resolve Thumb-2 branches to locally-defined, preemptible global symbols as short-range "b.n" branch instructions. This is a problem, because there's no guarantee the final destination of the symbol, or any candidate locations for a trampoline, are within range of the branch. For this reason, the kernel does not support fixing up the R_ARM_THM_JUMP11 (102) relocation in modules at all, and it makes little sense to add support. The symptom is that the kernel fails with an "unsupported relocation" error when loading some modules. Until fixed tools are available, passing -fno-optimize-sibling-calls to gcc should prevent gcc generating code which hits this problem, at the cost of a bit of extra runtime stack usage in some cases. The problem is described in more detail at: https://bugs.launchpad.net/binutils-linaro/+bug/725126 Only Thumb-2 kernels are affected. This patch adds a new CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11 config option which adds -fno-optimize-sibling-calls to CFLAGS_MODULE when building a Thumb-2 kernel. Signed-off-by: Dave Martin Acked-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/Kconfig | 31 +++++++++++++++++++++++++++++++ arch/arm/Makefile | 4 ++++ 2 files changed, 35 insertions(+) (limited to 'arch/arm/Makefile') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2fec7073f687..f871f2e1dd7c 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1379,6 +1379,37 @@ config THUMB2_KERNEL If unsure, say N. +config THUMB2_AVOID_R_ARM_THM_JUMP11 + bool "Work around buggy Thumb-2 short branch relocations in gas" + depends on THUMB2_KERNEL && MODULES + default y + help + Various binutils versions can resolve Thumb-2 branches to + locally-defined, preemptible global symbols as short-range "b.n" + branch instructions. + + This is a problem, because there's no guarantee the final + destination of the symbol, or any candidate locations for a + trampoline, are within range of the branch. For this reason, the + kernel does not support fixing up the R_ARM_THM_JUMP11 (102) + relocation in modules at all, and it makes little sense to add + support. + + The symptom is that the kernel fails with an "unsupported + relocation" error when loading some modules. + + Until fixed tools are available, passing + -fno-optimize-sibling-calls to gcc should prevent gcc generating + code which hits this problem, at the cost of a bit of extra runtime + stack usage in some cases. + + The problem is described in more detail at: + https://bugs.launchpad.net/binutils-linaro/+bug/725126 + + Only Thumb-2 kernels are affected. + + Unless you are sure your tools don't have this problem, say Y. + config ARM_ASM_UNIFIED bool diff --git a/arch/arm/Makefile b/arch/arm/Makefile index da525bc96145..6d611f407ce6 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -105,6 +105,10 @@ AFLAGS_AUTOIT :=$(call as-option,-Wa$(comma)-mimplicit-it=always,-Wa$(comma)-mau AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) CFLAGS_THUMB2 :=-mthumb $(AFLAGS_AUTOIT) $(AFLAGS_NOWARN) AFLAGS_THUMB2 :=$(CFLAGS_THUMB2) -Wa$(comma)-mthumb +# Work around buggy relocation from gas if requested: +ifeq ($(CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11),y) +CFLAGS_MODULE +=-fno-optimize-sibling-calls +endif endif # Need -Uarm for gcc < 3.x -- cgit v1.2.3