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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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20
include/sbi/riscv_unpriv.h
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@@ -12,11 +12,23 @@
#include <sbi/sbi_types.h>
#define DECLARE_UNPRIVILEGED_LOAD_FUNCTION(type) \
type load_##type(const type *addr);
struct sbi_scratch;
#define DECLARE_UNPRIVILEGED_STORE_FUNCTION(type) \
void store_##type(type *addr, type val);
struct unpriv_trap {
unsigned long ilen;
unsigned long cause;
unsigned long tval;
};
#define DECLARE_UNPRIVILEGED_LOAD_FUNCTION(type) \
type load_##type(const type *addr, \
struct sbi_scratch *scratch, \
struct unpriv_trap *trap);
#define DECLARE_UNPRIVILEGED_STORE_FUNCTION(type) \
void store_##type(type *addr, type val, \
struct sbi_scratch *scratch, \
struct unpriv_trap *trap);
DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u8)
DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u16)