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Date: Wed, 16 Mar 2022 15:03:10 +0800 From: guoren@...nel.org To: guoren@...nel.org, palmer@...belt.com, arnd@...db.de, anup@...infault.org, gregkh@...uxfoundation.org, 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, heiko@...ech.de, Guo Ren <guoren@...ux.alibaba.com> Subject: [PATCH V8 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 03ac3aa611f5..8c7665481a9f 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -97,6 +97,15 @@ 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
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