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- /*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
- *
- * Copyright (c) 2005 Antoine Brodin
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/param.h>
- #include <sys/lock.h>
- #include <sys/mutex.h>
- #include <sys/proc.h>
- #include <sys/stack.h>
- #include <sys/systm.h>
- #include <vm/vm.h>
- #include <vm/pmap.h>
- #include <vm/vm_extern.h>
- #include <machine/db_machdep.h>
- #include <machine/pcb.h>
- #include <machine/spr.h>
- #include <machine/stack.h>
- #include <machine/trap.h>
- #ifdef __powerpc64__
- #define CALLOFFSET 8 /* Account for the TOC reload slot */
- #else
- #define CALLOFFSET 4
- #endif
- static void
- stack_capture(struct stack *st, vm_offset_t frame)
- {
- vm_offset_t callpc;
- stack_zero(st);
- if (frame < PAGE_SIZE)
- return;
- while (1) {
- frame = *(vm_offset_t *)frame;
- if (frame < PAGE_SIZE)
- break;
- #ifdef __powerpc64__
- callpc = *(vm_offset_t *)(frame + 16) - 4;
- #else
- callpc = *(vm_offset_t *)(frame + 4) - 4;
- #endif
- if ((callpc & 3) || (callpc < 0x100))
- break;
- /*
- * Don't bother traversing trap-frames - there should
- * be enough info down to the frame to work out where
- * things are going wrong. Plus, prevents this shortened
- * version of code from accessing user-space frames
- */
- if (callpc + CALLOFFSET == (vm_offset_t) &trapexit ||
- callpc + CALLOFFSET == (vm_offset_t) &asttrapexit)
- break;
- if (stack_put(st, callpc) == -1)
- break;
- }
- }
- int
- stack_save_td(struct stack *st, struct thread *td)
- {
- vm_offset_t frame;
- THREAD_LOCK_ASSERT(td, MA_OWNED);
- KASSERT(!TD_IS_SWAPPED(td),
- ("stack_save_td: thread %p is swapped", td));
- if (TD_IS_RUNNING(td))
- return (EOPNOTSUPP);
- frame = td->td_pcb->pcb_sp;
- stack_capture(st, frame);
- return (0);
- }
- void
- stack_save(struct stack *st)
- {
- register_t frame;
- frame = (register_t)__builtin_frame_address(0);
- stack_capture(st, frame);
- }
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