[PATCH 12/18] riscv: threads need UBE flag setting if big-endian

[Ben Dooks]

If operating in big-endian, start all threads with UBE to keep
them the same endian as the system.

Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
---
 arch/riscv/include/asm/csr.h | 1 +
 arch/riscv/kernel/process.c  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 6fed42e37705..78f795936c7e 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -13,6 +13,7 @@
 #define SR_SIE		_AC(0x00000002, UL) /* Supervisor Interrupt Enable */
 #define SR_MIE		_AC(0x00000008, UL) /* Machine Interrupt Enable */
 #define SR_SPIE		_AC(0x00000020, UL) /* Previous Supervisor IE */
+#define SR_UBE		_AC(0x00000040, UL) /* User mode is big-endian */
 #define SR_MPIE		_AC(0x00000080, UL) /* Previous Machine IE */
 #define SR_SPP		_AC(0x00000100, UL) /* Previously Supervisor */
 #define SR_MPP		_AC(0x00001800, UL) /* Previously Machine */
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index a0a40889d79a..c4e335b5e5f3 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -144,6 +144,8 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
 	unsigned long sp)
 {
 	regs->status = SR_PIE;
+	if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		regs->status |= SR_UBE;
 	if (has_fpu()) {
 		regs->status |= SR_FS_INITIAL;
 		/*
-- 
2.37.2.352.g3c44437643