xnu-1228.tar.gz

[apple/xnu.git] / osfmk / kdp / ml / ppc / kdp_vm.c

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#include <mach/mach_types.h>
#include <mach/vm_attributes.h>
#include <mach/vm_param.h>

#include <vm/pmap.h>
 
#include <ppc/proc_reg.h>
#include <ppc/machparam.h>
#include <ppc/mem.h>
#include <ppc/pmap.h>
#include <ppc/mappings.h> 
#include <ppc/cpu_data.h>
#include <ppc/misc_protos.h>

#include <mach/thread_status.h>
#include <mach-o/loader.h>
#include <mach/vm_region.h>
#include <mach/vm_statistics.h>

#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_protos.h>
#include <kdp/kdp_core.h>
#include <kdp/kdp_udp.h>
#include <kdp/kdp_internal.h>

#include <ppc/misc_protos.h>
#include <mach/vm_map.h>


pmap_t kdp_pmap;
boolean_t kdp_trans_off;
boolean_t kdp_read_io;
uint32_t kdp_src_high32;

unsigned kdp_vm_read( caddr_t, caddr_t, unsigned);
unsigned kdp_vm_write( caddr_t, caddr_t, unsigned);

extern vm_offset_t sectTEXTB, sectDATAB, sectLINKB, sectPRELINKB;
extern int sectSizeTEXT, sectSizeDATA, sectSizeLINK, sectSizePRELINK;

static addr64_t kdp_vtophys(pmap_t pmap, addr64_t va);
int             kern_dump(void);

typedef struct {
  int   flavor;                 /* the number for this flavor */
  mach_msg_type_number_t        count;  /* count of ints in this flavor */
} mythread_state_flavor_t;

static mythread_state_flavor_t thread_flavor_array[] = {
  {PPC_THREAD_STATE , PPC_THREAD_STATE_COUNT},
};

static int kdp_mynum_flavors = 1;
static int MAX_TSTATE_FLAVORS = 1;

typedef struct {
  vm_offset_t header; 
  int  hoffset;
  mythread_state_flavor_t *flavors;
  int tstate_size;
} tir_t;

unsigned int not_in_kdp = 1; /* Cleared when we begin to access vm functions in kdp */

char command_buffer[512];

/*
 *
 */
static addr64_t
kdp_vtophys(
        pmap_t pmap,
        addr64_t va)
{
        addr64_t    pa;
        ppnum_t pp;

        pp = pmap_find_phys(pmap, va);                          /* Get the page number */
        if(!pp) return 0;                                                       /* Just return if no translation */
        
        pa = ((addr64_t)pp << 12) | (va & 0x0000000000000FFFULL);       /* Shove in the page offset */
        return(pa);
}
/* Verify that src is valid, and physically copy len bytes from src to
 * dst, translating if necessary. If translation is enabled
 * (kdp_trans_off is 0), a non-zero kdp_pmap specifies the pmap to use
 * when translating src.
 */

unsigned kdp_vm_read(
        caddr_t src, 
        caddr_t dst, 
        unsigned len)
{
        addr64_t cur_virt_src, cur_virt_dst;
        addr64_t cur_phys_src, cur_phys_dst;
        unsigned resid, cnt;
        unsigned int dummy;
        pmap_t pmap;

#ifdef KDP_VM_READ_DEBUG
    kprintf("kdp_vm_read1: src %x dst %x len %x - %08X %08X\n", src, dst, len, ((unsigned long *)src)[0], ((unsigned long *)src)[1]);
#endif

        cur_virt_src = (addr64_t)((unsigned int)src | (((uint64_t)kdp_src_high32) << 32));
        cur_virt_dst = (addr64_t)((unsigned int)dst);
        
        if (kdp_trans_off) {
                resid = len;    /* Get the length to copy */

                while (resid != 0) {

                        if((cur_phys_dst = kdp_vtophys(kernel_pmap, cur_virt_dst)) == 0)
                                goto exit;

                        if(kdp_read_io == 0)
                                if(!mapping_phys_lookup((ppnum_t)(cur_virt_src >> 12), &dummy)) return 0;       /* Can't read where there's not any memory */
                
                        cnt = 4096 - (cur_virt_src & 0xFFF);    /* Get length left on page */
                        if (cnt > (4096 - (cur_virt_dst & 0xFFF)))
                                cnt = 4096 - (cur_virt_dst & 0xFFF);
                
                        if (cnt > resid)  cnt = resid;

                        bcopy_phys(cur_virt_src, cur_phys_dst, cnt);            /* Copy stuff over */

                        cur_virt_src += cnt;
                        cur_virt_dst += cnt;
                        resid -= cnt;
                }
                
        } else {

                resid = len;

                if(kdp_pmap) pmap = kdp_pmap;                           /* If special pmap, use it */
                else pmap = kernel_pmap;                                        /* otherwise, use kernel's */

                while (resid != 0) {   
/* Always translate the destination using the kernel_pmap. */
                        if((cur_phys_dst = kdp_vtophys(kernel_pmap, cur_virt_dst)) == 0)
                                goto exit;

                        if((cur_phys_src = kdp_vtophys(pmap, cur_virt_src)) == 0)
                                goto exit;

                        if(kdp_read_io == 0)
                                if(!mapping_phys_lookup((ppnum_t)(cur_phys_src >> 12), &dummy)) goto exit;      /* Can't read where there's not any memory */

                        cnt = 4096 - (cur_virt_src & 0xFFF);    /* Get length left on page */
                        if (cnt > (4096 - (cur_virt_dst & 0xFFF)))
                                cnt = 4096 - (cur_virt_dst & 0xFFF);

                        if (cnt > resid) cnt = resid;

#ifdef KDP_VM_READ_DEBUG
                                kprintf("kdp_vm_read2: pmap %08X, virt %016LLX, phys %016LLX\n", 
                                        pmap, cur_virt_src, cur_phys_src);
#endif

                        bcopy_phys(cur_phys_src, cur_phys_dst, cnt);            /* Copy stuff over */
                        
                        cur_virt_src +=cnt;
                        cur_virt_dst +=cnt;
                        resid -= cnt;
                }
        }
exit:
#ifdef KDP_VM_READ_DEBUG
        kprintf("kdp_vm_read: ret %08X\n", len-resid);
#endif
        return (len - resid);
}

/*
 * 
 */
unsigned kdp_vm_write(
        caddr_t src,
        caddr_t dst,
        unsigned len)
{       
        addr64_t cur_virt_src, cur_virt_dst;
        addr64_t cur_phys_src, cur_phys_dst;
        unsigned resid, cnt, cnt_src, cnt_dst;

#ifdef KDP_VM_WRITE_DEBUG
        printf("kdp_vm_write: src %x dst %x len %x - %08X %08X\n", src, dst, len, ((unsigned long *)src)[0], ((unsigned long *)src)[1]);
#endif

        cur_virt_src = (addr64_t)((unsigned int)src);
        cur_virt_dst = (addr64_t)((unsigned int)dst);

        resid = len;

        while (resid != 0) {
                if ((cur_phys_dst = kdp_vtophys(kernel_pmap, cur_virt_dst)) == 0) 
                        goto exit;

                if ((cur_phys_src = kdp_vtophys(kernel_pmap, cur_virt_src)) == 0) 
                        goto exit;

                cnt_src = ((cur_phys_src + NBPG) & (-NBPG)) - cur_phys_src;
                cnt_dst = ((cur_phys_dst + NBPG) & (-NBPG)) - cur_phys_dst;

                if (cnt_src > cnt_dst)
                        cnt = cnt_dst;
                else
                        cnt = cnt_src;
                if (cnt > resid) 
                        cnt = resid;

                bcopy_phys(cur_phys_src, cur_phys_dst, cnt);            /* Copy stuff over */
                sync_cache64(cur_phys_dst, cnt);                                        /* Sync caches */

                cur_virt_src +=cnt;
                cur_virt_dst +=cnt;
                resid -= cnt;
        }
exit:
        return (len - resid);
}


static void
kern_collectth_state(thread_t thread, tir_t *t)
{
  vm_offset_t   header;
  int  hoffset, i ;
  mythread_state_flavor_t *flavors;
  struct thread_command *tc;
  /*
   *    Fill in thread command structure.
   */
  header = t->header;
  hoffset = t->hoffset;
  flavors = t->flavors;
        
  tc = (struct thread_command *) (header + hoffset);
  tc->cmd = LC_THREAD;
  tc->cmdsize = sizeof(struct thread_command)
    + t->tstate_size;
  hoffset += sizeof(struct thread_command);
  /*
   * Follow with a struct thread_state_flavor and
   * the appropriate thread state struct for each
   * thread state flavor.
   */
  for (i = 0; i < kdp_mynum_flavors; i++) {
    *(mythread_state_flavor_t *)(header+hoffset) =
      flavors[i];
    hoffset += sizeof(mythread_state_flavor_t);

    if (machine_thread_get_kern_state(thread, flavors[i].flavor,
                             (thread_state_t) (header+hoffset),
                                      &flavors[i].count) != KERN_SUCCESS)
      printf ("Failure in machine_thread_get_kern_state()\n");
    hoffset += flavors[i].count*sizeof(int);
  }

  t->hoffset = hoffset;
}

int
kdp_dump_trap(
              int type,
              __unused struct savearea *regs)
{
  printf ("An unexpected trap (type %d) occurred during the kernel dump, terminating.\n", type);
  kdp_send_crashdump_pkt(KDP_EOF, NULL, 0, ((void *) 0));
  abort_panic_transfer();
  kdp_flag &= ~KDP_PANIC_DUMP_ENABLED;
  kdp_flag &= ~PANIC_CORE_ON_NMI;
  kdp_flag &= ~PANIC_LOG_DUMP;

  kdp_reset();

  kdp_raise_exception(EXC_BAD_ACCESS, 0, 0, kdp.saved_state);
  return( 0 );
}

/*
 * Kernel dump (limited to currently executing 32 bit mach_kernel only)
 */
int
kern_dump(void)
{
  int error = 0;
  vm_map_t      map;
  unsigned int  thread_count, segment_count;
  unsigned int  command_size = 0, header_size = 0, tstate_size = 0;
  unsigned int  hoffset = 0, foffset = 0, nfoffset = 0,  vmoffset = 0;
  unsigned int  max_header_size = 0;
  vm_offset_t   header;
  struct mach_header    *mh;
  struct segment_command        *sc;
  vm_size_t     size;
  vm_prot_t     prot = 0;
  vm_prot_t     maxprot = 0;
  vm_inherit_t  inherit = 0;
  int           error1 = 0;
  mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
  vm_size_t     nflavors;
  vm_size_t     i;
  uint32_t nesting_depth = 0;
  kern_return_t kret = 0;
  struct vm_region_submap_info_64 vbr;
  mach_msg_type_number_t vbrcount  = 0;
  tir_t tir1;

  int panic_error = 0;
  unsigned int txstart = 0;
  unsigned int mach_section_count = 4;
  unsigned int num_sects_txed = 0;

  map = kernel_map;
  not_in_kdp = 0; /* Tell vm functions not to acquire locks */

  thread_count = 1;
  segment_count = get_vmmap_entries(map); 
  
  printf("Kernel map has %d entries\n", segment_count);

  nflavors = kdp_mynum_flavors;
  bcopy((char *)thread_flavor_array,(char *) flavors,sizeof(thread_flavor_array));

  for (i = 0; i < nflavors; i++)
    tstate_size += sizeof(mythread_state_flavor_t) +
      (flavors[i].count * sizeof(int));

  command_size = (segment_count + mach_section_count) *
    sizeof(struct segment_command) +
    thread_count*sizeof(struct thread_command) +
    tstate_size*thread_count;

  header_size = command_size + sizeof(struct mach_header);
  header = (vm_offset_t) command_buffer;
        
  /*
   *    Set up Mach-O header for currently executing 32 bit kernel.
   */
  printf ("Generated Mach-O header size was %d\n", header_size);

  mh = (struct mach_header *) header;
  mh->magic = MH_MAGIC;
  mh->cputype = cpu_type();
  mh->cpusubtype = cpu_subtype();       /* XXX incorrect; should match kernel */
  mh->filetype = MH_CORE;
  mh->ncmds = segment_count + thread_count + mach_section_count;
  mh->sizeofcmds = command_size;
  mh->flags = 0;

  hoffset = sizeof(struct mach_header); /* offset into header */
  foffset = round_page_32(header_size); /* offset into file */
  /* Padding.. */
  if ((foffset - header_size) < (4*sizeof(struct segment_command))) {
      /* Hack */
      foffset += ((4*sizeof(struct segment_command)) - (foffset-header_size)); 
    }

  max_header_size = foffset;

  vmoffset = VM_MIN_ADDRESS;            /* offset into VM */

  /* Transmit the Mach-O MH_CORE header, and seek forward past the 
   * area reserved for the segment and thread commands 
   * to begin data transmission 
   */

   if ((panic_error = kdp_send_crashdump_pkt(KDP_SEEK, NULL, sizeof(nfoffset) , &nfoffset)) < 0) { 
     printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error); 
     return -1; 
   } 

   if ((panic_error = kdp_send_crashdump_data(KDP_DATA, NULL, sizeof(struct mach_header), (caddr_t) mh) < 0)) {
     printf ("kdp_send_crashdump_data failed with error %d\n", panic_error);
     return -1 ;
   }

   if ((panic_error = kdp_send_crashdump_pkt(KDP_SEEK, NULL, sizeof(foffset) , &foffset) < 0)) {
     printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error);
     return (-1);
   }
  printf ("Transmitting kernel state, please wait: ");

  while ((segment_count > 0) || (kret == KERN_SUCCESS)){
    /* Check if we've transmitted all the kernel sections */
    if (num_sects_txed == mach_section_count) {
      
    while (1) {

    /*
     *  Get region information for next region.
     */

      vbrcount = VM_REGION_SUBMAP_INFO_COUNT_64;
      if((kret = vm_region_recurse_64(map, 
                                      &vmoffset, &size, &nesting_depth, 
                                      (vm_region_recurse_info_t)&vbr,
                                      &vbrcount)) != KERN_SUCCESS) {
        break;
      }

      if(vbr.is_submap) {
        nesting_depth++;
        continue;
      } else {
        break;
      }
    }

    if(kret != KERN_SUCCESS)
      break;

    prot = vbr.protection;
    maxprot = vbr.max_protection;
    inherit = vbr.inheritance;
    }
    else
      {
        switch (num_sects_txed) {
        case 0:
          {
            /* Transmit the kernel text section */
            vmoffset = sectTEXTB;
            size = sectSizeTEXT;
          }
          break;
        case 1:
          {
            vmoffset = sectDATAB;
            size = sectSizeDATA;
          }
          break;
        case 2:
          {
            vmoffset = sectPRELINKB;
            size = sectSizePRELINK;
          }
          break;
        case 3:
          {
            vmoffset = sectLINKB;
            size = sectSizeLINK;
          }
          break;
          /* TODO the lowmem vector area may be useful, but its transmission is
           * disabled for now. The traceback table area should be transmitted 
           * as well - that's indirected from 0x5080.
           */
        }
        num_sects_txed++;
      }
    /*
     *  Fill in segment command structure.
     */
    
    if (hoffset > max_header_size)
      break;
    sc = (struct segment_command *) (header);
    sc->cmd = LC_SEGMENT;
    sc->cmdsize = sizeof(struct segment_command);
    sc->segname[0] = 0;
    sc->vmaddr = vmoffset;
    sc->vmsize = size;
    sc->fileoff = foffset;
    sc->filesize = size;
    sc->maxprot = maxprot;
    sc->initprot = prot;
    sc->nsects = 0;

    if ((panic_error = kdp_send_crashdump_pkt(KDP_SEEK, NULL, sizeof(hoffset) , &hoffset)) < 0) { 
        printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error); 
        return -1; 
      } 
    
    if ((panic_error = kdp_send_crashdump_data(KDP_DATA, NULL, sizeof(struct segment_command) , (caddr_t) sc)) < 0) {
        printf ("kdp_send_crashdump_data failed with error %d\n", panic_error);
        return -1 ;
      }

    /* Do not transmit memory tagged VM_MEMORY_IOKIT - instead, seek past that
     * region on the server - this creates a hole in the file  
     */

    if ((vbr.user_tag != VM_MEMORY_IOKIT)) {
      
      if ((panic_error = kdp_send_crashdump_pkt(KDP_SEEK, NULL, sizeof(foffset) , &foffset)) < 0) {
          printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error);
          return (-1);
        }

      txstart = vmoffset;

      if ((panic_error = kdp_send_crashdump_data(KDP_DATA, NULL, size, (caddr_t) txstart)) < 0) {
          printf ("kdp_send_crashdump_data failed with error %d\n", panic_error);
          return -1 ;
        }
    }

    hoffset += sizeof(struct segment_command);
    foffset += size;
    vmoffset += size;
    segment_count--;
  }
  tir1.header = header;
  tir1.hoffset = 0;
  tir1.flavors = flavors;
  tir1.tstate_size = tstate_size;

  /* Now send out the LC_THREAD load command, with the thread information
   * for the current activation.
   * Note that the corefile can contain LC_SEGMENT commands with file offsets
   * that point past the edge of the corefile, in the event that the last N
   * VM regions were all I/O mapped or otherwise non-transferable memory, 
   * not followed by a normal VM region; i.e. there will be no hole that 
   * reaches to the end of the core file.
   */
  kern_collectth_state (current_thread(), &tir1);

  if ((panic_error = kdp_send_crashdump_pkt(KDP_SEEK, NULL, sizeof(hoffset) , &hoffset)) < 0) { 
      printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error); 
      return -1; 
    } 
  
    if ((panic_error = kdp_send_crashdump_data(KDP_DATA, NULL, tir1.hoffset , (caddr_t) header)) < 0) {
        printf ("kdp_send_crashdump_data failed with error %d\n", panic_error);
        return -1 ;
      }
    
    /* last packet */
    if ((panic_error = kdp_send_crashdump_pkt(KDP_EOF, NULL, 0, ((void *) 0))) < 0)
      {
        printf ("kdp_send_crashdump_pkt failed with error %d\n", panic_error);
        return (-1) ;
      }
    
    if (error == 0)
      error = error1;
    return (error);
}