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nextstep.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "primpl.h"

#import <mach/mach.h>
#import <mach/mach_error.h>
#import <mach-o/dyld.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <syscall.h>



/*    These functions are hidden in NEXTSTEP, but beacuse they have syscall()
**    entries I can wrap these into their corresponding missing function.
*/
caddr_t
mmap(caddr_t addr, size_t len, int prot, int flags,
          int fildes, off_t off)
{
      return (caddr_t) syscall (SYS_mmap, addr, len, prot, flags, fildes, off);
}

int
munmap(caddr_t addr, size_t len)
{
      return syscall (SYS_munmap, addr, len);
}

int
mprotect(caddr_t addr, size_t len, int prot)
{
      return syscall (SYS_mprotect, addr, len, prot);
}


/* If found the brk() symbol in the sahred libraries but no syscall() entry ...
** I don't know whether it will work ...
int brk(void *endds)
{
      return syscall ();
}
*/

void *sbrk(int incr)
{
      return (void *) syscall (SYS_sbrk, incr);
}

/*    These are my mach based versions, untested and probably bad ...
*/
caddr_t my_mmap(caddr_t addr, size_t len, int prot, int flags,
          int fildes, off_t off)
{
      kern_return_t ret_val;
      
      /*    First map ...
      */
      ret_val = map_fd ( fildes,                            /* fd                   */
                        (vm_offset_t) off,            /* offset               */
                                (vm_offset_t*)&addr,        /* address              */
                                TRUE,                             /* find_space           */
                                (vm_size_t) len);                 /* size                       */

      if (ret_val != KERN_SUCCESS) {
      mach_error("Error calling map_fd() in mmap", ret_val );
            return (caddr_t)0;
      }
      
      /*    ... then protect (this is probably bad)
      */
      ret_val = vm_protect( task_self(),              /* target_task          */
                                     (vm_address_t)addr,    /* address              */
                                     (vm_size_t) len,       /* size                 */
                                     FALSE,                             /* set_maximum          */
                                     (vm_prot_t) prot);           /* new_protection */
      if (ret_val != KERN_SUCCESS) {
            mach_error("vm_protect in mmap()", ret_val );
            return (caddr_t)0;
      }
      
      return addr;
}

int my_munmap(caddr_t addr, size_t len)
{
      kern_return_t ret_val;

      ret_val = vm_deallocate(task_self(),
                                          (vm_address_t) addr,
                                          (vm_size_t) len);

      if (ret_val != KERN_SUCCESS) {
            mach_error("vm_deallocate in munmap()", ret_val);
            return -1;
      }
      
      return 0;
}

int my_mprotect(caddr_t addr, size_t len, int prot)
{
      vm_prot_t mach_prot;
      kern_return_t ret_val;
      
      switch (prot) {
            case PROT_READ:         mach_prot = VM_PROT_READ;           break;
            case PROT_WRITE:  mach_prot = VM_PROT_WRITE;          break;
            case PROT_EXEC:         mach_prot = VM_PROT_EXECUTE;  break;
            case PROT_NONE:         mach_prot = VM_PROT_NONE;           break;
      }
      
      ret_val = vm_protect(task_self(),               /* target_task          */
                                     (vm_address_t)addr,    /* address              */
                                     (vm_size_t) len,       /* size                 */
                                     FALSE,                             /* set_maximum          */
                                     (vm_prot_t) prot);           /* new_protection */

      if (ret_val != KERN_SUCCESS) {
            mach_error("vm_protect in mprotect()", ret_val);
            return -1;
      }
      
      return 0;
}

char *strdup(const char *s1)
{
      int len = strlen (s1);
      char *copy = (char*) malloc (len+1);
      
      if (copy == (char*)0)
            return (char*)0;

      strcpy (copy, s1);

      return copy;
}

/* Stub rld functions
*/
extern NSObjectFileImageReturnCode NSCreateObjectFileImageFromFile(
    const char *pathName,
    NSObjectFileImage *objectFileImage)
{
      return NSObjectFileImageFailure;
}

extern void * NSAddressOfSymbol(
    NSSymbol symbol)
{
      return NULL;
}

extern NSModule NSLinkModule(
    NSObjectFileImage objectFileImage, 
    const char *moduleName, /* can be NULL */
    enum bool bindNow)
{
      return NULL;
}

extern NSSymbol NSLookupAndBindSymbol(
    const char *symbolName)
{
      return NULL;
}

extern enum bool NSUnLinkModule(
    NSModule module, 
    enum bool keepMemoryMapped)
{
      return 0;
}



void _MD_EarlyInit(void)
{
}

PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
#ifndef _PR_PTHREADS
    if (isCurrent) {
      (void) sigsetjmp(CONTEXT(t), 1);
    }
    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
    return (PRWord *) CONTEXT(t);
#else
      *np = 0;
      return NULL;
#endif
}

#ifndef _PR_PTHREADS

void
_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
{
    return;
}

PRStatus
_MD_InitializeThread(PRThread *thread)
{
      return PR_SUCCESS;
}

PRStatus
_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
{
    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
    _PR_MD_SWITCH_CONTEXT(thread);
    return PR_SUCCESS;
}

PRStatus
_MD_WAKEUP_WAITER(PRThread *thread)
{
    if (thread) {
      PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
    }
    return PR_SUCCESS;
}

/* These functions should not be called for NEXTSTEP */
void
_MD_YIELD(void)
{
    PR_NOT_REACHED("_MD_YIELD should not be called for NEXTSTEP.");
}

PRStatus
_MD_CREATE_THREAD(
    PRThread *thread,
    void (*start) (void *),
    PRThreadPriority priority,
    PRThreadScope scope,
    PRThreadState state,
    PRUint32 stackSize)
{
    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for NEXTSTEP.");
      return PR_FAILURE;
}

#endif

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