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riscv: handle access faults in user mode

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Access faults in user mode are treated like TLB misses, which leads to an
endless loop of faults. It's less serious than the same fault in kernel mode,
because we can just terminate the process, but that's not ideal.

Treat user mode access faults as a bus error.

Suggested by:	jrtc27
Reviewed by:	br, jhb
Sponsored by:	Axiado
Differential Revision:	https://reviews.freebsd.org/D26621
This commit is contained in:
kp 2020-10-02 07:30:11 +00:00
parent c06489b833
commit 80c44090ad
1 changed files with 4 additions and 0 deletions
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4
sys/riscv/riscv/trap.c
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@ -343,6 +343,10 @@ do_trap_user(struct trapframe *frame)
case EXCP_FAULT_LOAD:
case EXCP_FAULT_STORE:
case EXCP_FAULT_FETCH:
call_trapsignal(td, SIGBUS, BUS_ADRERR, (void *)frame->tf_sepc,
exception);
userret(td, frame);
break;
case EXCP_STORE_PAGE_FAULT:
case EXCP_LOAD_PAGE_FAULT:
case EXCP_INST_PAGE_FAULT: