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/*-
* 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/systm.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/stack.h>
#include <machine/vmparam.h>
#include <machine/pcb.h>
#include <machine/stack.h>
/*
* This code makes assumptions about the stack layout. These are correct
* when using APCS (the old ABI), but are no longer true with AAPCS and the
* ARM EABI. There is also an issue with clang and llvm when building for
* APCS where it lays out the stack incorrectly. Because of this we disable
* this when building for ARM EABI or when building with clang.
*/
extern vm_offset_t kernel_vm_end;
static void
stack_capture(struct stack *st, u_int32_t *frame)
{
#if !defined(__ARM_EABI__) && !defined(__clang__)
vm_offset_t callpc;
while (INKERNEL(frame) && (vm_offset_t)frame < kernel_vm_end) {
callpc = frame[FR_SCP];
if (stack_put(st, callpc) == -1)
break;
frame = (u_int32_t *)(frame[FR_RFP]);
}
#endif
}
void
stack_save_td(struct stack *st, struct thread *td)
{
u_int32_t *frame;
if (TD_IS_SWAPPED(td))
panic("stack_save_td: swapped");
if (TD_IS_RUNNING(td))
panic("stack_save_td: running");
/*
* This register, the frame pointer, is incorrect for the ARM EABI
* as it doesn't have a frame pointer, however it's value is not used
* when building for EABI.
*/
frame = (u_int32_t *)td->td_pcb->pcb_regs.sf_r11;
stack_zero(st);
stack_capture(st, frame);
}
void
stack_save(struct stack *st)
{
u_int32_t *frame;
frame = (u_int32_t *)__builtin_frame_address(0);
stack_zero(st);
stack_capture(st, frame);
}
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