Author: jhibbits Date: Wed Oct 30 15:30:40 2019 New Revision: 354182 URL: https://svnweb.freebsd.org/changeset/base/354182
Log: ARM64: Treat alignment faults as bus errors Summary: ARM64 currently treats all data abort exceptions as page faults. This can cause infinite loops on non-page fault faults, such as alignment faults. Since kernel-side alignment faults should be avoided, this adds support directly to the el0 fault handler, instead of the data_abort() handler. Test Plan: Tested on rpi3, with a misaligned ldm test. Reviewed by: andrew Differential Revision: https://reviews.freebsd.org/D22133 Modified: head/sys/arm64/arm64/trap.c Modified: head/sys/arm64/arm64/trap.c ============================================================================== --- head/sys/arm64/arm64/trap.c Wed Oct 30 15:26:41 2019 (r354181) +++ head/sys/arm64/arm64/trap.c Wed Oct 30 15:30:40 2019 (r354182) @@ -87,6 +87,7 @@ int (*dtrace_invop_jump_addr)(struct trapframe *); typedef void (abort_handler)(struct thread *, struct trapframe *, uint64_t, uint64_t, int); +static abort_handler align_abort; static abort_handler data_abort; static abort_handler *abort_handlers[] = { @@ -100,6 +101,7 @@ static abort_handler *abort_handlers[] = { [ISS_DATA_DFSC_PF_L1] = data_abort, [ISS_DATA_DFSC_PF_L2] = data_abort, [ISS_DATA_DFSC_PF_L3] = data_abort, + [ISS_DATA_DFSC_ALIGN] = align_abort, }; static __inline void @@ -163,6 +165,17 @@ svc_handler(struct thread *td, struct trapframe *frame call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr); userret(td, frame); } +} + +static void +align_abort(struct thread *td, struct trapframe *frame, uint64_t esr, + uint64_t far, int lower) +{ + if (!lower) + panic("Misaligned access from kernel space!"); + + call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr); + userret(td, frame); } static void _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
