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lib: Handle traps when doing unpriv load/store in get_insn()

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We can get a page/access trap when doing unpriv load/store in
get_insn() function because on a SMP system Linux swapper running
on HART A can unmap pages from page table used by HART B.

To tackle this we extend get_insn() implementation so that if
we get trap in get_insn() then we redirect it to S-mode as fetch
page/access fault.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2019-08-12 11:50:22 +05:30
parent 2e0f3ac758
commit a88e424f6c
4 changed files with 65 additions and 46 deletions
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3
include/sbi/riscv_unpriv.h
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@@ -43,6 +43,7 @@ DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u64)
DECLARE_UNPRIVILEGED_STORE_FUNCTION(u64)
DECLARE_UNPRIVILEGED_LOAD_FUNCTION(ulong)
ulong get_insn(ulong mepc, ulong *mstatus);
ulong get_insn(ulong mepc, struct sbi_scratch *scratch,
struct unpriv_trap *trap);
#endif