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authorWill Deacon <will.deacon@arm.com>2011-06-08 15:29:00 +0100
committerWill Deacon <will.deacon@arm.com>2011-12-12 16:07:35 +0000
commit2d81f1fe81b753a5744fd2deceafab3e62ba02d5 (patch)
treea5660d357bb9920f34751dd3ab39298e3e7cb33e /arch/arm/lib/Makefile
parentad622671a4da0b6db1c1382e6345e1361c5fbab8 (diff)
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ARM: lib: add call_with_stack function for safely changing stack
When disabling the MMU, it is necessary to take out a 1:1 identity map of the reset code so that it can safely be executed with and without the MMU active. To avoid the situation where the physical address of the reset code aliases with the virtual address of the active stack (which cannot be included in the 1:1 mapping), it is desirable to change to a new stack at a location which is less likely to alias. This code adds a new lib function, call_with_stack: void call_with_stack(void (*fn)(void *), void *arg, void *sp); which changes the stack to point at the sp parameter, before invoking fn(arg) with the new stack selected. Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/lib/Makefile')
-rw-r--r--arch/arm/lib/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index cf73a7f..0ade0ac 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -13,7 +13,8 @@ lib-y := backtrace.o changebit.o csumipv6.o csumpartial.o \
testchangebit.o testclearbit.o testsetbit.o \
ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
ucmpdi2.o lib1funcs.o div64.o \
- io-readsb.o io-writesb.o io-readsl.o io-writesl.o
+ io-readsb.o io-writesb.o io-readsl.o io-writesl.o \
+ call_with_stack.o
mmu-y := clear_user.o copy_page.o getuser.o putuser.o
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