linux-kernel - [PATCH V12 13/20] riscv: compat: process: Add UXL_32 support in start

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Message-Id: <20220405071314.3225832-14-guoren@kernel.org>
Date:   Tue,  5 Apr 2022 15:13:07 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org, palmer@...belt.com, arnd@...db.de,
        gregkh@...uxfoundation.org, hch@....de, nathan@...nel.org,
        naresh.kamboju@...aro.org
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-parisc@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        heiko@...ech.de, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V12 13/20] riscv: compat: process: 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. We need CONFIG _COMPAT to prevent compiling
errors with rv32 defconfig.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Palmer Dabbelt <palmer@...belt.com>
---
 arch/riscv/kernel/process.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 504b496787aa..b4421c16198c 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -98,6 +98,15 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
 	}
 	regs->epc = pc;
 	regs->sp = sp;
+
+#ifdef CONFIG_64BIT
+	regs->status &= ~SR_UXL;
+
+	if (is_compat_task())
+		regs->status |= SR_UXL_32;
+	else
+		regs->status |= SR_UXL_64;
+#endif
 }
 
 void flush_thread(void)
-- 
2.25.1