[PATCH V7 13/20] riscv: compat: process: Add UXL_32 support in start_thread

[guoren@kernel.org]

From: Guo Ren <guoren@linux.alibaba.com>

If the current task is in COMPAT mode, set SR_UXL_32 in status for
returning userspace. We need CONFIG _COMPAT to prevent compiling
errors with rv32 defconfig.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
---
 arch/riscv/kernel/process.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 03ac3aa611f5..54787ca9806a 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -97,6 +97,11 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
 	}
 	regs->epc = pc;
 	regs->sp = sp;
+
+	if (is_compat_task())
+		regs->status = (regs->status & ~SR_UXL) | SR_UXL_32;
+	else
+		regs->status = (regs->status & ~SR_UXL) | SR_UXL_64;
 }
 
 void flush_thread(void)
-- 
2.25.1