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lib: Redirect unhandled traps from non-M modes to S mode

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In case we didn't handle a trap with one of the available
handlers, check if the trap comes from S or U mode and
redirect it to S mode's trap handler.

Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>
This commit is contained in:
Nick Kossifidis
2019-04-16 20:21:55 +03:00
committed by Anup Patel
parent 194dbbe5a1
commit 804b997ed4
1 changed files with 3 additions and 0 deletions
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3
lib/sbi_trap.c
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@@ -142,6 +142,7 @@ void sbi_trap_handler(struct sbi_trap_regs *regs,
const char *msg = "trap handler failed";
u32 hartid = sbi_current_hartid();
ulong mcause = csr_read(CSR_MCAUSE);
ulong mtval = csr_read(CSR_MTVAL);
if (mcause & (1UL << (__riscv_xlen - 1))) {
mcause &= ~(1UL << (__riscv_xlen - 1));
@@ -178,6 +179,8 @@ void sbi_trap_handler(struct sbi_trap_regs *regs,
msg = "ecall handler failed";
break;
default:
/* If the trap came from S or U mode, redirect it there */
rc = sbi_trap_redirect(regs, scratch, regs->mepc, mcause, mtval);
break;
};