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3 Commits

Author SHA1 Message Date
Bin Meng
10753ef8fd riscv: Return to previous privilege level after trap handling 
At present the trap handler returns to hardcoded M-mode/S-mode.
Change to returning to previous privilege level instead.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2018-12-18 09:56:27 +08:00
Bin Meng
496262cca6 riscv: Fix context restore before returning from trap handler 
sp cannot be loaded before restoring other registers.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2018-12-18 09:56:27 +08:00
Bin Meng
4b3f5ed5ac riscv: Move trap handler codes to mtrap.S 
Currently the M-mode trap handler codes are in start.S. For future
extension, move them to a separate file mtrap.S.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2018-12-18 09:56:27 +08:00