vectored interrupt mode not an option for stvec

[Jan Reinhard]

Hello OpenSBI member,

as described in my issue on the OpenSBI Repository, Vectored mode for 
stvec is not possible right now:
https://github.com/riscv-software-src/opensbi/issues/391

I was asked to provide a patch to make it possible. I attached it to 
this mail.

Regards,
Jan

-- 
Mit freundlichen Grüßen / Best regards / Cordialement

Jan Reinhard
Security Engineer
jan.reinhard at sysgo.com
Phone: +49 (0) 6136 9948 735

SYSGO GmbH
Am Pfaffenstein 8 | 55270 Klein-Winternheim | Germany

www.sysgo.com | www.sysgo.com/news

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diff --git a/lib/sbi/sbi_trap.c b/lib/sbi/sbi_trap.c
index e63a563..363e91f 100644
--- a/lib/sbi/sbi_trap.c
+++ b/lib/sbi/sbi_trap.c
@@ -205,6 +205,8 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
 
 		/* Set MEPC to S-mode exception vector base */
 		regs->mepc = csr_read(CSR_STVEC);
+       /* clear the mode field */
+       regs->mepc &= ~0x3;
 
 		/* Set MPP to S-mode */
 		regs->mstatus &= ~MSTATUS_MPP;
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