[PATCH V8 13/20] riscv: compat: process: Add UXL_32 support in start_thread
From: guoren@kernel.org
Date: 2022-03-16 07:05:11
Also in:
linux-arch, linux-arm-kernel, linux-mips, linux-riscv, linux-s390, lkml, sparclinux
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
From: Guo Ren <redacted> 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 <redacted> 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