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