FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/dump_machdep.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2002 Marcel Moolenaar
      * 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 ``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 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 "opt_watchdog.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/sysctl.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/kerneldump.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <machine/dump.h>
    #include <machine/elf.h>
    #include <machine/md_var.h>
    #include <machine/pcb.h>
    #include <machine/armreg.h>
    #include <machine/vmparam.h>    /* For KERNVIRTADDR */
    
    int do_minidump = 1;
    SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RWTUN, &do_minidump, 0,
        "Enable mini crash dumps");
    
    void
    dumpsys_wbinv_all(void)
    {
    
            /*
             * Make sure we write coherent data.  Note that in the SMP case this
             * only operates on the L1 cache of the current CPU, but all other CPUs
             * have already been stopped, and their flush/invalidate was done as
             * part of stopping.
             */
            dcache_wbinv_poc_all();
    #ifdef __XSCALE__
            xscale_cache_clean_minidata();
    #endif
    }
    
    void
    dumpsys_map_chunk(vm_paddr_t pa, size_t chunk, void **va)
    {
            vm_paddr_t a;
            int i;
    
            for (i = 0; i < chunk; i++) {
                    a = pa + i * PAGE_SIZE;
                    *va = pmap_kenter_temporary(trunc_page(a), i);
            }
    }
    
    /*
     * Add a header to be used by libkvm to get the va to pa delta
     */
    int
    dumpsys_write_aux_headers(struct dumperinfo *di)
    {
            Elf_Phdr phdr;
            int error;
    
            bzero(&phdr, sizeof(phdr));
            phdr.p_type = PT_DUMP_DELTA;
            phdr.p_flags = PF_R;                    /* XXX */
            phdr.p_offset = 0;
            phdr.p_vaddr = KERNVIRTADDR;
            phdr.p_paddr = pmap_kextract(KERNVIRTADDR);
            phdr.p_filesz = 0;
            phdr.p_memsz = 0;
           phdr.p_align = PAGE_SIZE;
   
           error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
           return (error);
   }

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