Date: Thu, 10 Dec 2020 22:20:21 +0000 (UTC) From: Mitchell Horne <mhorne@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r368527 - head/sys/riscv/riscv Message-ID: <202012102220.0BAMKLrj097091@repo.freebsd.org>
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Author: mhorne Date: Thu Dec 10 22:20:20 2020 New Revision: 368527 URL: https://svnweb.freebsd.org/changeset/base/368527 Log: 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 Modified: head/sys/riscv/riscv/trap.c Modified: head/sys/riscv/riscv/trap.c ============================================================================== --- head/sys/riscv/riscv/trap.c Thu Dec 10 21:12:25 2020 (r368526) +++ head/sys/riscv/riscv/trap.c Thu Dec 10 22:20:20 2020 (r368527) @@ -179,6 +179,9 @@ page_fault_handler(struct trapframe *frame, int usermo 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); }
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