Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   guoren@kernel.org
To:     guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de,
        anup@brainfault.org, gregkh@linuxfoundation.org,
        liush@allwinnertech.com, wefu@redhat.com, drew@beagleboard.org,
        wangjunqiang@iscas.ac.cn, hch@lst.de
Cc:     linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-csky@vger.kernel.org,
        linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-parisc@vger.kernel.org,
        linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        x86@kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V5 13/21] riscv: compat: process: Add UXL_32 support in start_thread
Date:   Tue,  1 Feb 2022 23:05:37 +0800
Message-Id: <20220201150545.1512822-14-guoren@kernel.org>
In-Reply-To: <20220201150545.1512822-1-guoren@kernel.org>
References: <20220201150545.1512822-1-guoren@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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..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