--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/darwin-user/mmap.c Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,410 @@
+/*
+ * mmap support for qemu
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/mman.h>
+
+#include "qemu.h"
+
+//#define DEBUG_MMAP
+
+/* NOTE: all the constants are the HOST ones */
+int target_mprotect(unsigned long start, unsigned long len, int prot)
+{
+ unsigned long end, host_start, host_end, addr;
+ int prot1, ret;
+
+#ifdef DEBUG_MMAP
+ printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
+ prot & PROT_READ ? 'r' : '-',
+ prot & PROT_WRITE ? 'w' : '-',
+ prot & PROT_EXEC ? 'x' : '-');
+#endif
+
+ if ((start & ~TARGET_PAGE_MASK) != 0)
+ return -EINVAL;
+ len = TARGET_PAGE_ALIGN(len);
+ end = start + len;
+ if (end < start)
+ return -EINVAL;
+ if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
+ return -EINVAL;
+ if (len == 0)
+ return 0;
+
+ host_start = start & qemu_host_page_mask;
+ host_end = HOST_PAGE_ALIGN(end);
+ if (start > host_start) {
+ /* handle host page containing start */
+ prot1 = prot;
+ for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
+ prot1 |= page_get_flags(addr);
+ }
+ if (host_end == host_start + qemu_host_page_size) {
+ for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ prot1 |= page_get_flags(addr);
+ }
+ end = host_end;
+ }
+ ret = mprotect((void *)host_start, qemu_host_page_size, prot1 & PAGE_BITS);
+ if (ret != 0)
+ return ret;
+ host_start += qemu_host_page_size;
+ }
+ if (end < host_end) {
+ prot1 = prot;
+ for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ prot1 |= page_get_flags(addr);
+ }
+ ret = mprotect((void *)(host_end - qemu_host_page_size), qemu_host_page_size,
+ prot1 & PAGE_BITS);
+ if (ret != 0)
+ return ret;
+ host_end -= qemu_host_page_size;
+ }
+
+ /* handle the pages in the middle */
+ if (host_start < host_end) {
+ ret = mprotect((void *)host_start, host_end - host_start, prot);
+ if (ret != 0)
+ return ret;
+ }
+ page_set_flags(start, start + len, prot | PAGE_VALID);
+ return 0;
+}
+
+/* map an incomplete host page */
+int mmap_frag(unsigned long host_start,
+ unsigned long start, unsigned long end,
+ int prot, int flags, int fd, unsigned long offset)
+{
+ unsigned long host_end, ret, addr;
+ int prot1, prot_new;
+
+ host_end = host_start + qemu_host_page_size;
+
+ /* get the protection of the target pages outside the mapping */
+ prot1 = 0;
+ for(addr = host_start; addr < host_end; addr++) {
+ if (addr < start || addr >= end)
+ prot1 |= page_get_flags(addr);
+ }
+
+ if (prot1 == 0) {
+ /* no page was there, so we allocate one */
+ ret = (long)mmap((void *)host_start, qemu_host_page_size, prot,
+ flags | MAP_ANONYMOUS, -1, 0);
+ if (ret == -1)
+ return ret;
+ }
+ prot1 &= PAGE_BITS;
+
+ prot_new = prot | prot1;
+ if (!(flags & MAP_ANONYMOUS)) {
+ /* msync() won't work here, so we return an error if write is
+ possible while it is a shared mapping */
+#ifndef __APPLE__
+ if ((flags & MAP_TYPE) == MAP_SHARED &&
+#else
+ if ((flags & MAP_SHARED) &&
+#endif
+ (prot & PROT_WRITE))
+ return -EINVAL;
+
+ /* adjust protection to be able to read */
+ if (!(prot1 & PROT_WRITE))
+ mprotect((void *)host_start, qemu_host_page_size, prot1 | PROT_WRITE);
+
+ /* read the corresponding file data */
+ pread(fd, (void *)start, end - start, offset);
+
+ /* put final protection */
+ if (prot_new != (prot1 | PROT_WRITE))
+ mprotect((void *)host_start, qemu_host_page_size, prot_new);
+ } else {
+ /* just update the protection */
+ if (prot_new != prot1) {
+ mprotect((void *)host_start, qemu_host_page_size, prot_new);
+ }
+ }
+ return 0;
+}
+
+/* NOTE: all the constants are the HOST ones */
+long target_mmap(unsigned long start, unsigned long len, int prot,
+ int flags, int fd, unsigned long offset)
+{
+ unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len;
+#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
+ static unsigned long last_start = 0x40000000;
+#endif
+
+#ifdef DEBUG_MMAP
+ {
+ printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
+ start, len,
+ prot & PROT_READ ? 'r' : '-',
+ prot & PROT_WRITE ? 'w' : '-',
+ prot & PROT_EXEC ? 'x' : '-');
+ if (flags & MAP_FIXED)
+ printf("MAP_FIXED ");
+ if (flags & MAP_ANONYMOUS)
+ printf("MAP_ANON ");
+#ifndef MAP_TYPE
+# define MAP_TYPE 0x3
+#endif
+ switch(flags & MAP_TYPE) {
+ case MAP_PRIVATE:
+ printf("MAP_PRIVATE ");
+ break;
+ case MAP_SHARED:
+ printf("MAP_SHARED ");
+ break;
+ default:
+ printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
+ break;
+ }
+ printf("fd=%d offset=%lx\n", fd, offset);
+ }
+#endif
+
+ if (offset & ~TARGET_PAGE_MASK)
+ return -EINVAL;
+
+ len = TARGET_PAGE_ALIGN(len);
+ if (len == 0)
+ return start;
+ host_start = start & qemu_host_page_mask;
+
+ if (!(flags & MAP_FIXED)) {
+#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
+ /* tell the kernel to search at the same place as i386 */
+ if (host_start == 0) {
+ host_start = last_start;
+ last_start += HOST_PAGE_ALIGN(len);
+ }
+#endif
+ if (qemu_host_page_size != qemu_real_host_page_size) {
+ /* NOTE: this code is only for debugging with '-p' option */
+ /* reserve a memory area */
+ host_len = HOST_PAGE_ALIGN(len) + qemu_host_page_size - TARGET_PAGE_SIZE;
+ host_start = (long)mmap((void *)host_start, host_len, PROT_NONE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (host_start == -1)
+ return host_start;
+ host_end = host_start + host_len;
+ start = HOST_PAGE_ALIGN(host_start);
+ end = start + HOST_PAGE_ALIGN(len);
+ if (start > host_start)
+ munmap((void *)host_start, start - host_start);
+ if (end < host_end)
+ munmap((void *)end, host_end - end);
+ /* use it as a fixed mapping */
+ flags |= MAP_FIXED;
+ } else {
+ /* if not fixed, no need to do anything */
+ host_offset = offset & qemu_host_page_mask;
+ host_len = len + offset - host_offset;
+ start = (long)mmap((void *)host_start, host_len,
+ prot, flags, fd, host_offset);
+ if (start == -1)
+ return start;
+ /* update start so that it points to the file position at 'offset' */
+ if (!(flags & MAP_ANONYMOUS))
+ start += offset - host_offset;
+ goto the_end1;
+ }
+ }
+
+ if (start & ~TARGET_PAGE_MASK)
+ return -EINVAL;
+ end = start + len;
+ host_end = HOST_PAGE_ALIGN(end);
+
+ /* worst case: we cannot map the file because the offset is not
+ aligned, so we read it */
+ if (!(flags & MAP_ANONYMOUS) &&
+ (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
+ /* msync() won't work here, so we return an error if write is
+ possible while it is a shared mapping */
+#ifndef __APPLE__
+ if ((flags & MAP_TYPE) == MAP_SHARED &&
+#else
+ if ((flags & MAP_SHARED) &&
+#endif
+ (prot & PROT_WRITE))
+ return -EINVAL;
+ retaddr = target_mmap(start, len, prot | PROT_WRITE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+ if (retaddr == -1)
+ return retaddr;
+ pread(fd, (void *)start, len, offset);
+ if (!(prot & PROT_WRITE)) {
+ ret = target_mprotect(start, len, prot);
+ if (ret != 0)
+ return ret;
+ }
+ goto the_end;
+ }
+
+ /* handle the start of the mapping */
+ if (start > host_start) {
+ if (host_end == host_start + qemu_host_page_size) {
+ /* one single host page */
+ ret = mmap_frag(host_start, start, end,
+ prot, flags, fd, offset);
+ if (ret == -1)
+ return ret;
+ goto the_end1;
+ }
+ ret = mmap_frag(host_start, start, host_start + qemu_host_page_size,
+ prot, flags, fd, offset);
+ if (ret == -1)
+ return ret;
+ host_start += qemu_host_page_size;
+ }
+ /* handle the end of the mapping */
+ if (end < host_end) {
+ ret = mmap_frag(host_end - qemu_host_page_size,
+ host_end - qemu_host_page_size, host_end,
+ prot, flags, fd,
+ offset + host_end - qemu_host_page_size - start);
+ if (ret == -1)
+ return ret;
+ host_end -= qemu_host_page_size;
+ }
+
+ /* map the middle (easier) */
+ if (host_start < host_end) {
+ unsigned long offset1;
+ if (flags & MAP_ANONYMOUS)
+ offset1 = 0;
+ else
+ offset1 = offset + host_start - start;
+ ret = (long)mmap((void *)host_start, host_end - host_start,
+ prot, flags, fd, offset1);
+ if (ret == -1)
+ return ret;
+ }
+ the_end1:
+ page_set_flags(start, start + len, prot | PAGE_VALID);
+ the_end:
+#ifdef DEBUG_MMAP
+ printf("target_mmap: ret=0x%lx\n", (long)start);
+ page_dump(stdout);
+ printf("\n");
+#endif
+ return start;
+}
+
+int target_munmap(unsigned long start, unsigned long len)
+{
+ unsigned long end, host_start, host_end, addr;
+ int prot, ret;
+
+#ifdef DEBUG_MMAP
+ printf("munmap: start=0x%lx len=0x%lx\n", start, len);
+#endif
+ if (start & ~TARGET_PAGE_MASK)
+ return -EINVAL;
+ len = TARGET_PAGE_ALIGN(len);
+ if (len == 0)
+ return -EINVAL;
+ end = start + len;
+ host_start = start & qemu_host_page_mask;
+ host_end = HOST_PAGE_ALIGN(end);
+
+ if (start > host_start) {
+ /* handle host page containing start */
+ prot = 0;
+ for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
+ prot |= page_get_flags(addr);
+ }
+ if (host_end == host_start + qemu_host_page_size) {
+ for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ prot |= page_get_flags(addr);
+ }
+ end = host_end;
+ }
+ if (prot != 0)
+ host_start += qemu_host_page_size;
+ }
+ if (end < host_end) {
+ prot = 0;
+ for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ prot |= page_get_flags(addr);
+ }
+ if (prot != 0)
+ host_end -= qemu_host_page_size;
+ }
+
+ /* unmap what we can */
+ if (host_start < host_end) {
+ ret = munmap((void *)host_start, host_end - host_start);
+ if (ret != 0)
+ return ret;
+ }
+
+ page_set_flags(start, start + len, 0);
+ return 0;
+}
+
+/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
+ blocks which have been allocated starting on a host page */
+long target_mremap(unsigned long old_addr, unsigned long old_size,
+ unsigned long new_size, unsigned long flags,
+ unsigned long new_addr)
+{
+#ifndef __APPLE__
+ /* XXX: use 5 args syscall */
+ new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags);
+ if (new_addr == -1)
+ return new_addr;
+ prot = page_get_flags(old_addr);
+ page_set_flags(old_addr, old_addr + old_size, 0);
+ page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
+ return new_addr;
+#else
+ qerror("target_mremap: unsupported\n");
+#endif
+
+}
+
+int target_msync(unsigned long start, unsigned long len, int flags)
+{
+ unsigned long end;
+
+ if (start & ~TARGET_PAGE_MASK)
+ return -EINVAL;
+ len = TARGET_PAGE_ALIGN(len);
+ end = start + len;
+ if (end < start)
+ return -EINVAL;
+ if (end == start)
+ return 0;
+
+ start &= qemu_host_page_mask;
+ return msync((void *)start, end - start, flags);
+}