diff options
| author | Mitchell Horne <mhorne@FreeBSD.org> | 2020-12-10 22:20:20 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2020-12-10 22:20:20 +0000 |
| commit | 5a28499f2ff58dbdc2666c8791ca82cddc6ec4e0 (patch) | |
| tree | 3cf366292c04710c3b693f4bbd29cfd7dd3ac9a7 /sys/riscv/riscv | |
| parent | 78adacd4eab39a3508bd8c65f0aba94fc6b907ce (diff) | |
| download | src-5a28499f2ff58dbdc2666c8791ca82cddc6ec4e0.tar.gz src-5a28499f2ff58dbdc2666c8791ca82cddc6ec4e0.zip | |
riscv: handle debug.debugger_on_trap for fatal page faults
Allows recovery or diagnosis of a fatal page fault before panicking the
system.
Reviewed by: jhb, kp
Differential Revision: https://reviews.freebsd.org/D27534
Notes
Notes:
svn path=/head/; revision=368527
Diffstat (limited to 'sys/riscv/riscv')
| -rw-r--r-- | sys/riscv/riscv/trap.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/riscv/riscv/trap.c b/sys/riscv/riscv/trap.c index 6ba82980bc17..599fd64b56be 100644 --- a/sys/riscv/riscv/trap.c +++ b/sys/riscv/riscv/trap.c @@ -179,6 +179,9 @@ page_fault_handler(struct trapframe *frame, int usermode) vm_offset_t va; struct proc *p; int error, sig, ucode; +#ifdef KDB + bool handled; +#endif #ifdef KDB if (kdb_active) { @@ -250,6 +253,15 @@ done: fatal: 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); } |