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authorCatalin Marinas <catalin.marinas@arm.com>2009-05-30 14:00:18 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2009-05-30 14:00:18 +0100
commit26584853a44c58f3d6ac7360d697a2ddcd1a3efa (patch)
treea47156d781c6207d316746a056a81ca82b90d452 /arch/arm/kernel
parentee8c9571191e588ede9a220ded807e33c4897d91 (diff)
Add core support for ARMv6/v7 big-endian
Starting with ARMv6, the CPUs support the BE-8 variant of big-endian (byte-invariant). This patch adds the core support: - setting of the BE-8 mode via the CPSR.E register for both kernel and user threads - big-endian page table walking - REV used to rotate instructions read from memory during fault processing as they are still little-endian format - Kconfig and Makefile support for BE-8. The --be8 option must be passed to the final linking stage to convert the instructions to little-endian Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/entry-armv.S3
-rw-r--r--arch/arm/kernel/entry-common.S3
-rw-r--r--arch/arm/kernel/process.c2
3 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index d662a2f1fd8..9d7ce4377c5 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -482,6 +482,9 @@ __und_usr:
subeq r4, r2, #4 @ ARM instr at LR - 4
subne r4, r2, #2 @ Thumb instr at LR - 2
1: ldreqt r0, [r4]
+#ifdef CONFIG_CPU_ENDIAN_BE8
+ reveq r0, r0 @ little endian instruction
+#endif
beq call_fpe
@ Thumb instruction
#if __LINUX_ARM_ARCH__ >= 7
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index b55cb033180..366e5097a41 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -210,6 +210,9 @@ ENTRY(vector_swi)
A710( teq ip, #0x0f000000 )
A710( bne .Larm710bug )
#endif
+#ifdef CONFIG_CPU_ENDIAN_BE8
+ rev r10, r10 @ little endian instruction
+#endif
#elif defined(CONFIG_AEABI)
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index c3265a2e7cd..1585423699e 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -365,7 +365,7 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
regs.ARM_r2 = (unsigned long)fn;
regs.ARM_r3 = (unsigned long)do_exit;
regs.ARM_pc = (unsigned long)kernel_thread_helper;
- regs.ARM_cpsr = SVC_MODE;
+ regs.ARM_cpsr = SVC_MODE | PSR_ENDSTATE;
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}