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lib: sbi_trap: Restore redirect for access faults

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commit 764a17d852 ("lib: sbi: Implement firmware counters") added
switch cases for CAUSE_LOAD_ACCESS and CAUSE_STORE_ACCESS. This caused
them to stop being redirected to U or S mode, as that is handled in the
default switch case. As a result, an error in userspace could cause the
system to hang. Fix this by allowing the acces fault case to fall
through to the default case.

Fixes: 764a17d852 ("lib: sbi: Implement firmware counters")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Samuel Holland
2021-08-14 08:41:47 -05:00
committed by Anup Patel
parent 33eac764f2
commit ee274377b2
1 changed files with 3 additions and 4 deletions
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7
lib/sbi/sbi_trap.c
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@@ -259,11 +259,10 @@ struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs)
msg = "ecall handler failed";
break;
case CAUSE_LOAD_ACCESS:
sbi_pmu_ctr_incr_fw(SBI_PMU_FW_ACCESS_LOAD);
break;
case CAUSE_STORE_ACCESS:
sbi_pmu_ctr_incr_fw(SBI_PMU_FW_ACCESS_STORE);
break;
sbi_pmu_ctr_incr_fw(mcause == CAUSE_LOAD_ACCESS ?
SBI_PMU_FW_ACCESS_LOAD : SBI_PMU_FW_ACCESS_STORE);
/* fallthrough */
default:
/* If the trap came from S or U mode, redirect it there */
trap.epc = regs->mepc;