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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-11-24 16:54:35 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-05-08 11:42:34 +0200 |
| commit | 7d485f647c1f4a6976264c90447fb0dbf07b111d (patch) | |
| tree | 1ddeb6618cebf5b4a48ca225de772120b734e701 /arch/arm/Makefile | |
| parent | ARM: 8353/1: mm: Fix Cortex-A8 erratum 430973 segfaults for bootloaders and m... (diff) | |
| download | linux-7d485f647c1f4a6976264c90447fb0dbf07b111d.tar.xz linux-7d485f647c1f4a6976264c90447fb0dbf07b111d.zip | |
ARM: 8220/1: allow modules outside of bl range
Loading modules far away from the kernel in memory is problematic
because the 'bl' instruction only has limited reach, and modules are not
built with PLTs. Instead of using the -mlong-calls option (which affects
all compiler emitted bl instructions, but not the ones in assembler),
this patch allocates some additional space at module load time, and
populates it with PLT like veneers when encountering relocations that
are out of range.
This should work with all relocations against symbols exported by the
kernel, including those resulting from GCC generated implicit function
calls for ftrace etc.
The module memory size increases by about 5% on average, regardless of
whether any PLT entries were actually needed. However, due to the page
based rounding that occurs when allocating module memory, the average
memory footprint increase is negligible.
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Makefile')
| -rw-r--r-- | arch/arm/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 985227cbbd1b..ffb53e86599e 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -19,6 +19,10 @@ LDFLAGS_vmlinux += --be8 LDFLAGS_MODULE += --be8 endif +ifeq ($(CONFIG_ARM_MODULE_PLTS),y) +LDFLAGS_MODULE += -T $(srctree)/arch/arm/kernel/module.lds +endif + OBJCOPYFLAGS :=-O binary -R .comment -S GZFLAGS :=-9 #KBUILD_CFLAGS +=-pipe |