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lib: Handle page/access fault caused by unpriv load/store

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The unpriv load/store instruction from M-mode can cause page/access
fault to M-mode if S-mode page table did not have mappings OR it did
not have PMP access permission.

To tackle this, we redirect trap back to S-mode if unpriv load/store
instruction traps in M-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2019-05-23 13:30:58 +05:30
committed by Anup Patel
parent bb915780ac
commit a6395acd6c
9 changed files with 131 additions and 44 deletions
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include/sbi/sbi_error.h
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@@ -25,6 +25,7 @@
#define SBI_EILL -10
#define SBI_ENOSPC -11
#define SBI_ENOMEM -12
#define SBI_ETRAP -13
/* clang-format on */