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riscv: handle debug.debugger_on_trap for fatal page faults

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Allows recovery or diagnosis of a fatal page fault before panicking the
system.

Reviewed by:	jhb, kp
Differential Revision:	https://reviews.freebsd.org/D27534
This commit is contained in:
Mitchell Horne 2020-12-10 22:20:20 +00:00
parent 78adacd4ea
commit 5a28499f2f
1 changed files with 12 additions and 0 deletions
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12
sys/riscv/riscv/trap.c
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@ -179,6 +179,9 @@ page_fault_handler(struct trapframe *frame, int usermode)
vm_offset_t va; vm_offset_t va;
struct proc *p; struct proc *p;
int error, sig, ucode; int error, sig, ucode;
#ifdef KDB
bool handled;
#endif
#ifdef KDB #ifdef KDB
if (kdb_active) { if (kdb_active) {
@ -250,6 +253,15 @@ done:
fatal: fatal:
dump_regs(frame); dump_regs(frame);
#ifdef KDB
if (debugger_on_trap) {
kdb_why = KDB_WHY_TRAP;
handled = kdb_trap(frame->tf_scause & SCAUSE_CODE, 0, frame);
kdb_why = KDB_WHY_UNSET;
if (handled)
return;
}
#endif
panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, stval); panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, stval);
} }