[RFC] arm:consider THUMB and BE endian kernel build

[yalin wang]

this patch fix the function in kernel_thread(),
when kernel is build as THUMB2 or BE8 endian, we should
also set the correct bit in CPSR, so that kernel can return to
the correct state to execute.
---
 arch/arm/kernel/process.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index f192a2a..9a7ab32 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -220,6 +220,12 @@ copy_thread(unsigned long clone_flags, unsigned 
long stack_start,
 		thread->cpu_context.r4 = stk_sz;
 		thread->cpu_context.r5 = stack_start;
 		childregs->ARM_cpsr = SVC_MODE;
+#ifdef CONFIG_THUMB2_KERNEL
+		childregs->ARM_cpsr |= PSR_T_BIT;
+#endif
+#ifdef CONFIG_CPU_ENDIAN_BE8
+		childregs->ARM_cpsr |= PSR_E_BIT;
+#endif
 	}
 	thread->cpu_context.pc = (unsigned long)ret_from_fork;
 	thread->cpu_context.sp = (unsigned long)childregs;
--
1.9.1
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