[V12,13/20] riscv: compat: process: Add UXL_32 support in start_thread

Commit Message

Guo Ren April 5, 2022, 7:13 a.m. UTC

From: Guo Ren <[e-mail]>

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 <[e-mail]>
Signed-off-by: Guo Ren <[e-mail]>
Tested-by: Heiko Stuebner <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
---
 arch/riscv/kernel/process.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 504b496787aa..b4421c16198c 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -98,6 +98,15 @@  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)