linux-kernel - [PATCH V3 15/17] riscv: compat: Add UXL_32 support in start

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Message-Id: <20220120073911.99857-16-guoren@kernel.org>
Date:   Thu, 20 Jan 2022 15:39:08 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org, palmer@...belt.com, arnd@...db.de,
        anup@...infault.org, gregkh@...uxfoundation.org,
        liush@...winnertech.com, wefu@...hat.com, drew@...gleboard.org,
        wangjunqiang@...as.ac.cn, hch@....de, hch@...radead.org
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-csky@...r.kernel.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        inux-parisc@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V3 15/17] riscv: compat: Add UXL_32 support in start_thread

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

If the current task is in COMPAT mode, set SR_UXL_32 in status for
returning userspace.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
---
 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..1a666ad299b4 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;
+
+#ifdef CONFIG_COMPAT
+	if (is_compat_task())
+		regs->status |= SR_UXL_32;
+#endif
 }
 
 void flush_thread(void)
-- 
2.25.1