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Message-Id: <20220201150545.1512822-14-guoren@kernel.org>
Date: Tue, 1 Feb 2022 23:05:37 +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
Cc: linux-arch@...r.kernel.org, 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, linux-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 V5 13/21] 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>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Palmer Dabbelt <palmer@...belt.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
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