xnu-1228.15.4.tar.gz

[apple/xnu.git] / bsd / kern / kern_symfile.c

diff --git a/bsd/kern/kern_symfile.c b/bsd/kern/kern_symfile.c
index ed56bd1cddf50ff18cb82d942ac60cb0a7d72ab3..98e4e7771c51244ffb4238bfc4c3df69ca859b7f 100644 (file)
--- a/bsd/kern/kern_symfile.c
+++ b/bsd/kern/kern_symfile.c
@@ -1,48 +1,35 @@
 /*
 /*

- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  *
  *     File:   bsd/kern/kern_symfile.c
  *
  */
 /* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  *
  *     File:   bsd/kern/kern_symfile.c
  *

- *     This file contains creates a dummy symbol file for mach_kernel
- *     based on the symbol table information passed by the
- *     SecondaryLoader/PlatformExpert.  This allows us to correctly
- *     link other executables (drivers, etc) against the the kernel in
- *     cases where the kernel image on the root device does not match
- *      the live kernel. This can occur during net-booting where the
- *     actual kernel image is obtained from the network via tftp rather
- *     than the root device.
- *
- *      If a symbol table is available, then the file /mach.sym will be
- *     created containing a Mach Header and a LC_SYMTAB load command
- *     followed by the the symbol table data for mach_kernel.
- *
- * NOTE:       This file supports only 32 bit kernels at the present time;
- *             adding support for 64 bit kernels is possible, but is not
- *             necessary at the present time.
- *

  * HISTORY
  * HISTORY

- * 
- *     .

  */
 
 #include <mach/vm_param.h>
  */
 
 #include <mach/vm_param.h>


@@ -71,273 +58,248 @@
 #include <kern/kalloc.h>
 #include <vm/vm_kern.h>
 #include <pexpert/pexpert.h>
 #include <kern/kalloc.h>
 #include <vm/vm_kern.h>
 #include <pexpert/pexpert.h>

+#include <IOKit/IOHibernatePrivate.h>
+
+/* This function is called from kern_sysctl in the current process context;
+ * it is exported with the System6.0.exports, but this appears to be a legacy
+ * export, as there are no internal consumers.
+ */
+int
+get_kernel_symfile(__unused proc_t p, __unused char const **symfile)
+{
+    return KERN_FAILURE;
+}

 
 

-extern unsigned char   rootdevice[];
-extern struct mach_header _mh_execute_header;
+struct kern_direct_file_io_ref_t
+{
+    vfs_context_t              ctx;
+    struct vnode               *vp;
+};

 
 

-static int kernel_symfile_opened = 0;
-static int error_code = 0;

 
 

-extern int  IODTGetLoaderInfo(char *key, void **infoAddr, int *infoSize);
-extern void IODTFreeLoaderInfo(char *key, void *infoAddr, int infoSize);
+static int file_ioctl(void * p1, void * p2, int theIoctl, caddr_t result)
+{
+    dev_t device = (dev_t) p1;

 
 

-/*
- * Can only operate against currently running 32 bit mach_kernel
- */
-static int
-output_kernel_symbols(struct proc *p)
+    return ((*bdevsw[major(device)].d_ioctl)
+                   (device, theIoctl, result, S_IFBLK, p2));
+}
+
+static int device_ioctl(void * p1, __unused void * p2, int theIoctl, caddr_t result)

 {
 {

-    struct vnode               *vp;
-    kauth_cred_t               cred = p->p_ucred;      /* XXX */
+    return (VNOP_IOCTL(p1, theIoctl, result, 0, p2));
+}
+
+struct kern_direct_file_io_ref_t *
+kern_open_file_for_direct_io(const char * name, 
+                            kern_get_file_extents_callback_t callback, 
+                            void * callback_ref,
+                            dev_t * device_result,
+                             uint64_t * partitionbase_result,
+                             uint64_t * maxiocount_result)
+{
+    struct kern_direct_file_io_ref_t * ref;
+
+    proc_t                     p;

     struct vnode_attr          va;
     struct vnode_attr          va;

-    struct vfs_context         context;
-    struct load_command                *cmd;
-    struct mach_header         *orig_mh, *mh;
-    struct segment_command     *orig_ds, *orig_ts, *orig_le, *sg;
-    struct section             *se, *const_text;
-    struct symtab_command      *st, *orig_st;
-    struct nlist               *sym;
-    vm_size_t                  orig_mhsize, orig_st_size;
-    vm_offset_t                        header;
-    vm_size_t                  header_size = 0; /* out: protected by header */
-    int                                error, error1;
-    unsigned int               i, j;
-    caddr_t                    addr;
-    vm_offset_t                        offset;
-    int                                rc_mh, rc_sc;
+    int                                error;
+    off_t                      f_offset;
+    uint32_t                   blksize;
+    uint64_t                   size;
+    dev_t                      device;
+    off_t                      maxiocount, count;
+
+    int (*do_ioctl)(void * p1, void * p2, int theIoctl, caddr_t result);
+    void * p1;
+    void * p2;

 
     error = EFAULT;
 
 
     error = EFAULT;
 

-    vp         = NULL;
-    header     = NULL;
-    orig_mh    = NULL;
-    orig_st    = NULL;
-    
-    // Dispose of unnecessary gumf, the booter doesn't need to load these
-    rc_mh = IODTGetLoaderInfo("Kernel-__HEADER",
-                               (void **)&orig_mh, &orig_mhsize);
-    if (rc_mh == 0 && orig_mh)
-       IODTFreeLoaderInfo("Kernel-__HEADER",
-                           (void *)orig_mh, round_page_32(orig_mhsize));
-
-    rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB",
-                               (void **) &orig_st, &orig_st_size);
-    if (rc_sc == 0 && orig_st)
-       IODTFreeLoaderInfo("Kernel-__SYMTAB",
-                           (void *)orig_st, round_page_32(orig_st_size));
-
-    if (cred->cr_svuid != cred->cr_ruid || cred->cr_svgid != cred->cr_rgid)
-       goto out;
-
-    // Check to see if the root is 'e' or 'n', is this a test for network?
-    if (rootdevice[0] == 'e' && rootdevice[1] == 'n')
-       goto out;
-
-    context.vc_proc = p;
-    context.vc_ucred = cred;
-
-    if ((error = vnode_open("mach.sym", (O_CREAT | FWRITE), (S_IRUSR | S_IRGRP | S_IROTH), 0, &vp, &context)))
+    ref = (struct kern_direct_file_io_ref_t *) kalloc(sizeof(struct kern_direct_file_io_ref_t));
+    if (!ref)
+    {
+       error = EFAULT;
+       goto out;
+    }
+
+    ref->vp = NULL;
+    p = current_proc();                // kernproc;
+    ref->ctx = vfs_context_create(vfs_context_current());
+
+    if ((error = vnode_open(name, (O_CREAT | FWRITE), (0), 0, &ref->vp, ref->ctx)))

         goto out;
 
         goto out;
 

-    /* Don't dump to non-regular files or files with links. */
-    error = EFAULT;

     VATTR_INIT(&va);
     VATTR_INIT(&va);

+    VATTR_WANTED(&va, va_rdev);
+    VATTR_WANTED(&va, va_fsid);
+    VATTR_WANTED(&va, va_data_size);

     VATTR_WANTED(&va, va_nlink);
     VATTR_WANTED(&va, va_nlink);

-    if ((vp->v_type != VREG) || vnode_getattr(vp, &va, &context) || (va.va_nlink != 1))
-       goto out;
-
-    VATTR_INIT(&va);                   /* better to do it here than waste more stack in vnode_getsize */
-    VATTR_SET(&va, va_data_size, 0);
-    vnode_setattr(vp, &va, &context);
-    p->p_acflag |= ACORE;
-
-    // If the file type is MH_EXECUTE then this must be a kernel
-    // as all Kernel extensions must be of type MH_OBJECT
-    orig_ds = orig_ts = orig_le = NULL;
-    orig_st = NULL;
-    orig_mh = &_mh_execute_header;
-    cmd = (struct load_command *) &orig_mh[1];
-    for (i = 0; i < orig_mh->ncmds; i++) {
-       if (cmd->cmd == LC_SEGMENT) {
-           struct segment_command *orig_sg = (struct segment_command *) cmd;
-    
-           if (!strcmp(SEG_TEXT, orig_sg->segname))
-               orig_ts = orig_sg;
-           else if (!strcmp(SEG_DATA, orig_sg->segname))
-               orig_ds = orig_sg;
-           else if (!strcmp(SEG_LINKEDIT, orig_sg->segname))
-               orig_le = orig_sg;
-       }
-       else if (cmd->cmd == LC_SYMTAB)
-           orig_st = (struct symtab_command *) cmd;
-    
-       cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize);
+    error = EFAULT;
+    if (vnode_getattr(ref->vp, &va, ref->ctx))
+       goto out;
+
+    kprintf("vp va_rdev major %d minor %d\n", major(va.va_rdev), minor(va.va_rdev));
+    kprintf("vp va_fsid major %d minor %d\n", major(va.va_fsid), minor(va.va_fsid));
+    kprintf("vp size %qd\n", va.va_data_size);
+
+    if (ref->vp->v_type == VREG)
+    {
+       /* Don't dump files with links. */
+       if (va.va_nlink != 1)
+           goto out;
+
+        device = va.va_fsid;
+        p1 = (void *) device;
+        p2 = p;
+        do_ioctl = &file_ioctl;

     }
     }

-
-    if (!orig_ts || !orig_ds || !orig_le || !orig_st) 
-       goto out;
-
-    const_text = NULL;
-    se = (struct section *) &orig_ts[1];
-    for (i = 0; i < orig_ts->nsects; i++, se++) {
-       if (!strcmp("__const", se->sectname)) {
-           const_text = se;
-           break;
-       }
+    else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
+    {
+       /* Partition. */
+        device = va.va_rdev;
+
+        p1 = ref->vp;
+        p2 = ref->ctx;
+        do_ioctl = &device_ioctl;

     }
     }

-    if (!const_text)
-       goto out;
-
-    header_size =   sizeof(struct mach_header) 
-                   + orig_ts->cmdsize
-                   + orig_ds->cmdsize
-                   + sizeof(struct symtab_command);
-
-    (void) kmem_alloc(kernel_map,
-                           (vm_offset_t *) &header,
-                           (vm_size_t) header_size);
-    if (header)
-       bzero((void *) header, header_size);

     else
     else

-       goto out;
-
-    /*
-     * Set up Mach-O header.
-     */
-    mh = (struct mach_header *) header;
-    mh->magic      = orig_mh->magic;
-    mh->cputype    = orig_mh->cputype;
-    mh->cpusubtype = orig_mh->cpusubtype;
-    mh->filetype   = orig_mh->filetype;
-    mh->ncmds      = 3;
-    mh->sizeofcmds = header_size - sizeof(struct mach_header);
-    mh->flags      = orig_mh->flags;
-
-    // Initialise the current file offset and addr
-    offset = round_page(header_size);
-    addr = (caddr_t) const_text->addr; // Load address of __TEXT,__const
-
-    /*
-     * Construct a TEXT segment load command
-     * the only part of the TEXT segment we keep is the __TEXT,__const
-     * which contains the kernel vtables. 
-     */
-    sg = (struct segment_command *) &mh[1];
-    bcopy(orig_ts, sg, orig_ts->cmdsize);
-    sg->vmaddr   = (unsigned long) addr;
-    sg->vmsize   = const_text->size;
-    sg->fileoff  = 0;
-    sg->filesize = const_text->size + round_page(header_size);
-    sg->maxprot  = 0;
-    sg->initprot = 0;
-    sg->flags    = 0;
-    se = (struct section *)(sg+1);
-    for ( j = 0; j < sg->nsects; j++, se++ ) {
-       se->addr  = (unsigned long) addr;
-       se->size  = 0;
-       se->offset = offset;
-       se->nreloc = 0;
-       if (!strcmp("__const", se->sectname)) {
-           se->size = const_text->size;
-           addr    += const_text->size;
-           offset  += const_text->size;
-           const_text = se;
-       }
-    }
-    offset = round_page(offset);
-
-    // Now copy of the __DATA segment load command, the image need
-    // not be stored to disk nobody needs it, yet!
-    sg = (struct segment_command *)((int)sg + sg->cmdsize);
-    bcopy(orig_ds, sg, orig_ds->cmdsize);
-
-    sg->vmaddr   = (unsigned long) addr;
-    sg->vmsize   = 0x1000;     // One page for some reason?
-    sg->fileoff  = offset;
-    sg->filesize = 0;
-    sg->maxprot  = 0;
-    sg->initprot = 0;
-    sg->flags    = 0;
-    se = (struct section *)(sg+1);
-    for ( j = 0; j < sg->nsects; j++, se++ ) {
-       se->addr  = (unsigned long) addr;
-       se->size  = 0;
-       se->offset = offset;
-       se->nreloc = 0;
-    }
-    offset = round_page(offset);
-
-
-    /*
-     * Set up LC_SYMTAB command
-     */
-    st          = (struct symtab_command *)((int)sg + sg->cmdsize);
-    st->cmd     = LC_SYMTAB;
-    st->cmdsize = sizeof(struct symtab_command);
-    st->symoff  = offset;
-    st->nsyms   = orig_st->nsyms;
-    st->strsize = orig_st->strsize;
-    st->stroff =  offset + st->nsyms * sizeof(struct nlist);    
-
-    /*
-     * Convert the symbol table in place from section references
-     * to absolute references.
-     */
-    sym = (struct nlist *) orig_le->vmaddr;
-    for (i = 0; i < st->nsyms; i++, sym++ ) {
-       if ( (sym->n_type & N_TYPE) == N_SECT) {
-           sym->n_sect = NO_SECT;
-           sym->n_type = (sym->n_type & ~N_TYPE) | N_ABS;
-       }
+    {
+       /* Don't dump to non-regular files. */
+       error = EFAULT;
+        goto out;

     }
 
     }
 

-    /*
-     * Write out the load commands at the beginning of the file.
-     */
-    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0,
-                   UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+    // get partition base
+
+    error = do_ioctl(p1, p2, DKIOCGETBASE, (caddr_t) partitionbase_result);
+    if (error)
+        goto out;
+
+    // get block size & constraints
+
+    error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &blksize);
+    if (error)
+        goto out;
+
+    maxiocount = 1*1024*1024*1024;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t) &count);

     if (error)
     if (error)

-       goto out;
-
-    /*
-     * Write out the __TEXT,__const data segment.
-     */
-    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr,
-                   const_text->size, const_text->offset,
-                   UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+        count = 0;
+    count *= blksize;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTWRITE, (caddr_t) &count);
+    if (error)
+        count = 0;
+    count *= blksize;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTREAD, (caddr_t) &count);
+    if (error)
+        count = 0;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTWRITE, (caddr_t) &count);
+    if (error)
+        count = 0;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTREAD, (caddr_t) &count);
+    if (error)
+        count = 0;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTWRITE, (caddr_t) &count);

     if (error)
     if (error)

-       goto out;
-
-    /*
-     *         Write out kernel symbols
-     */
-    offset = st->nsyms * sizeof(struct nlist) + st->strsize;   // symtab size
-    error = vn_rdwr(UIO_WRITE, vp,
-                  (caddr_t) orig_le->vmaddr, offset, st->symoff,
-                   UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+        count = 0;
+    if (count && (count < maxiocount))
+        maxiocount = count;
+
+    kprintf("max io 0x%qx bytes\n", maxiocount);
+    if (maxiocount_result)
+        *maxiocount_result = maxiocount;
+
+    // generate the block list
+
+    error = 0;
+    if (ref->vp->v_type == VREG)
+    {
+       f_offset = 0;
+       while(f_offset < (off_t) va.va_data_size) 
+       {
+           size_t io_size = 1*1024*1024*1024;
+           daddr64_t blkno;
+
+           error = VNOP_BLOCKMAP(ref->vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, 0, NULL);
+           if (error)
+               goto out;
+           callback(callback_ref, ((uint64_t) blkno) * blksize, (uint64_t) io_size);
+           f_offset += io_size;
+       }
+       callback(callback_ref, 0ULL, 0ULL);
+    }
+    else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
+    {
+        error = do_ioctl(p1, p2, DKIOCGETBLOCKCOUNT, (caddr_t) &size);
+        if (error)
+            goto out;
+       size *= blksize;
+       callback(callback_ref, 0ULL, size);
+       callback(callback_ref, size, 0ULL);
+    }
+
+    if (device_result)
+        *device_result = device;
+

 out:
 out:

-    if (header)
-       kmem_free(kernel_map, header, header_size);
+    kprintf("kern_open_file_for_direct_io(%d)\n", error);

 
 

-    if (vp) {
-       error1 = vnode_close(vp, FWRITE, &context);
-       if (!error) error = error1;
+    if (error && ref) {
+       if (ref->vp) {
+           vnode_close(ref->vp, FWRITE, ref->ctx);
+           ref->vp = NULLVP;
+       }
+
+       vfs_context_rele(ref->ctx);
+       kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
+       ref = NULL;

     }
 
     }
 

-    return(error);
+    return(ref);

 }
 }

-/*
- * 
- */
-int get_kernel_symfile(struct proc *p, char **symfile)
+
+int
+kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, caddr_t addr, vm_size_t len)

 {
 {

-    if (!kernel_symfile_opened) {
-        kernel_symfile_opened = 1;
-        error_code = output_kernel_symbols(p);
-    }
-    if (!error_code)
-       *symfile = "\\mach.sym";
+    return (vn_rdwr(UIO_WRITE, ref->vp,
+                       addr, len, offset,
+                       UIO_SYSSPACE32, IO_SYNC|IO_NODELOCKED|IO_UNIT, 
+                        vfs_context_ucred(ref->ctx), (int *) 0,
+                       vfs_context_proc(ref->ctx)));
+}

 
 

-    return error_code;
+void
+kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref)
+{
+    kprintf("kern_close_file_for_direct_io\n");
+
+    if (ref) {
+       int                error;
+
+       if (ref->vp) {
+           error = vnode_close(ref->vp, FWRITE, ref->ctx);
+           ref->vp = NULLVP;
+           kprintf("vnode_close(%d)\n", error);
+       }
+       vfs_context_rele(ref->ctx);
+       ref->ctx = NULL;
+       kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
+    }

 }
 
 }