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riscv: compat: process: Add UXL_32 support in start_thread

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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>
Link: https://lore.kernel.org/r/20220405071314.3225832-14-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2022-04-05 15:13:07 +08:00 committed by Palmer Dabbelt
parent dfb0bfa738
commit 69d0bf4cc6
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1 changed files with 9 additions and 0 deletions
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9
arch/riscv/kernel/process.c
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@ -98,6 +98,15 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
} }
regs->epc = pc; regs->epc = pc;
regs->sp = sp; 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) void flush_thread(void)