Messages in this thread Patch in this message |  | | From | guoren@kernel ... | Subject | [PATCH V11 13/20] riscv: compat: process: Add UXL_32 support in start_thread | Date | Sat, 2 Apr 2022 21:52:49 +0800 |
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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> Tested-by: Heiko Stuebner <heiko@sntech.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Palmer Dabbelt <palmer@dabbelt.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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