/*
* mmap support for qemu
- *
+ *
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
int prot1, ret;
#ifdef DEBUG_MMAP
- printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
+ printf("mprotect: start=0x" TARGET_FMT_lx
+ "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len,
prot & PROT_READ ? 'r' : '-',
prot & PROT_WRITE ? 'w' : '-',
prot & PROT_EXEC ? 'x' : '-');
return -EINVAL;
if (len == 0)
return 0;
-
+
host_start = start & qemu_host_page_mask;
host_end = HOST_PAGE_ALIGN(end);
if (start > host_start) {
for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
prot1 |= page_get_flags(addr);
}
- ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
+ ret = mprotect(g2h(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(g2h(host_start), host_end - host_start, prot);
}
/* map an incomplete host page */
-static int mmap_frag(target_ulong real_start,
- target_ulong start, target_ulong end,
+static int mmap_frag(target_ulong real_start,
+ target_ulong start, target_ulong end,
int prot, int flags, int fd, target_ulong offset)
{
target_ulong real_end, ret, 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(host_start, qemu_host_page_size, prot,
+ ret = (long)mmap(host_start, qemu_host_page_size, prot,
flags | MAP_ANONYMOUS, -1, 0);
if (ret == -1)
return ret;
/* adjust protection to be able to read */
if (!(prot1 & PROT_WRITE))
mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
-
+
/* read the corresponding file data */
pread(fd, g2h(start), end - start, offset);
-
+
/* put final protection */
if (prot_new != (prot1 | PROT_WRITE))
mprotect(host_start, qemu_host_page_size, prot_new);
}
/* NOTE: all the constants are the HOST ones */
-long target_mmap(target_ulong start, target_ulong len, int prot,
+target_long target_mmap(target_ulong start, target_ulong len, int prot,
int flags, int fd, target_ulong offset)
{
target_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
- long host_start;
+ unsigned long host_start;
#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__) || \
defined(__ia64) || defined(__mips__)
static target_ulong last_start = 0x40000000;
#ifdef DEBUG_MMAP
{
- printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
- start, len,
+ printf("mmap: start=0x" TARGET_FMT_lx
+ " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=",
+ start, len,
prot & PROT_READ ? 'r' : '-',
prot & PROT_WRITE ? 'w' : '-',
prot & PROT_EXEC ? 'x' : '-');
printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
break;
}
- printf("fd=%d offset=%lx\n", fd, offset);
+ printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset);
}
#endif
last_start += HOST_PAGE_ALIGN(len);
}
#endif
- if (0 && qemu_host_page_size != qemu_real_host_page_size) {
- /* NOTE: this code is only for debugging with '-p' option */
- /* ??? Can also occur when TARGET_PAGE_SIZE > host page size. */
- /* reserve a memory area */
- /* ??? This needs fixing for remapping. */
-abort();
- host_len = HOST_PAGE_ALIGN(len) + qemu_host_page_size - TARGET_PAGE_SIZE;
- real_start = (long)mmap(g2h(real_start), host_len, PROT_NONE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (real_start == -1)
- return real_start;
- real_end = real_start + host_len;
- start = HOST_PAGE_ALIGN(real_start);
- end = start + HOST_PAGE_ALIGN(len);
- if (start > real_start)
- munmap((void *)real_start, start - real_start);
- if (end < real_end)
- munmap((void *)end, real_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;
+
+ if (qemu_host_page_size > qemu_real_host_page_size) {
+ /*
+ * The guest expects to see mmapped areas aligned to it's pagesize.
+ * If the host's real page size is smaller than the guest's, we need
+ * to fixup the maps. It is done by allocating a larger area,
+ * displacing the map (if needed) and finally chopping off the spare
+ * room at the edges.
+ */
+
+ /*
+ * We assume qemu_host_page_size is always the same as
+ * TARGET_PAGE_SIZE, see exec.c. qemu_real_host_page_size is the
+ * hosts real page size.
+ */
+ target_ulong host_end;
+ unsigned long host_aligned_start;
+
+ host_len = HOST_PAGE_ALIGN(host_len + qemu_host_page_size
+ - qemu_real_host_page_size);
+ host_start = (unsigned long) mmap(real_start ?
+ g2h(real_start) : NULL,
+ host_len, prot, flags,
+ fd, host_offset);
+ if (host_start == -1)
+ return -1;
+
+ host_end = host_start + host_len;
+
+ /* Find start and end, aligned to the targets pagesize with-in the
+ large mmaped area. */
+ host_aligned_start = TARGET_PAGE_ALIGN(host_start);
+ if (!(flags & MAP_ANONYMOUS))
+ host_aligned_start += offset - host_offset;
+
+ start = h2g(host_aligned_start);
+ end = start + TARGET_PAGE_ALIGN(len);
+
+ /* Chop off the leftovers, if any. */
+ if (host_aligned_start > host_start)
+ munmap((void *)host_start, host_aligned_start - host_start);
+ if (end < host_end)
+ munmap((void *)g2h(end), host_end - end);
+
+ goto the_end1;
+ } else {
+ /* if not fixed, no need to do anything */
host_start = (long)mmap(real_start ? g2h(real_start) : NULL,
host_len, prot, flags, fd, host_offset);
if (host_start == -1)
- return host_start;
+ return -1;
/* update start so that it points to the file position at 'offset' */
- if (!(flags & MAP_ANONYMOUS))
+ if (!(flags & MAP_ANONYMOUS))
host_start += offset - host_offset;
start = h2g(host_start);
goto the_end1;
}
}
-
+
if (start & ~TARGET_PAGE_MASK) {
errno = EINVAL;
return -1;
errno = EINVAL;
return -1;
}
- retaddr = target_mmap(start, len, prot | PROT_WRITE,
- MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
+ retaddr = target_mmap(start, len, prot | PROT_WRITE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
if (retaddr == -1)
- return retaddr;
+ return -1;
pread(fd, g2h(start), len, offset);
if (!(prot & PROT_WRITE)) {
ret = target_mprotect(start, len, prot);
}
/* handle the end of the mapping */
if (end < real_end) {
- ret = mmap_frag(real_end - qemu_host_page_size,
+ ret = mmap_frag(real_end - qemu_host_page_size,
real_end - qemu_host_page_size, real_end,
- prot, flags, fd,
+ prot, flags, fd,
offset + real_end - qemu_host_page_size - start);
if (ret == -1)
- return ret;
+ return -1;
real_end -= qemu_host_page_size;
}
-
+
/* map the middle (easier) */
if (real_start < real_end) {
unsigned long offset1;
offset1 = 0;
else
offset1 = offset + real_start - start;
- ret = (long)mmap(g2h(real_start), real_end - real_start,
+ ret = (long)mmap(g2h(real_start), real_end - real_start,
prot, flags, fd, offset1);
if (ret == -1)
- return ret;
+ return -1;
}
the_end1:
page_set_flags(start, start + len, prot | PAGE_VALID);
the_end:
#ifdef DEBUG_MMAP
- printf("ret=0x%lx\n", (long)start);
+ printf("ret=0x%llx\n", start);
page_dump(stdout);
printf("\n");
#endif
if (prot != 0)
real_end -= qemu_host_page_size;
}
-
+
/* unmap what we can */
if (real_start < real_end) {
- ret = munmap((void *)real_start, real_end - real_start);
+ ret = munmap(g2h(real_start), real_end - real_start);
if (ret != 0)
return ret;
}
/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
blocks which have been allocated starting on a host page */
-long target_mremap(target_ulong old_addr, target_ulong old_size,
+target_long target_mremap(target_ulong old_addr, target_ulong old_size,
target_ulong new_size, unsigned long flags,
target_ulong new_addr)
{
int prot;
+ unsigned long host_addr;
/* XXX: use 5 args syscall */
- new_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
- if (new_addr == -1)
- return new_addr;
- new_addr = h2g(new_addr);
+ host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
+ if (host_addr == -1)
+ return -1;
+ new_addr = h2g(host_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 -EINVAL;
if (end == start)
return 0;
-
+
start &= qemu_host_page_mask;
return msync(g2h(start), end - start, flags);
}
projects / qemu.git / blobdiff