* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
-
+#include "trace.h"
+#include "exec/log.h"
#include "qemu.h"
-#include "qemu-common.h"
-
-//#define DEBUG_MMAP
+#include "user-internals.h"
+#include "user-mmap.h"
static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
static __thread int mmap_lock_count;
pthread_mutex_unlock(&mmap_mutex);
}
+/*
+ * Validate target prot bitmask.
+ * Return the prot bitmask for the host in *HOST_PROT.
+ * Return 0 if the target prot bitmask is invalid, otherwise
+ * the internal qemu page_flags (which will include PAGE_VALID).
+ */
+static int validate_prot_to_pageflags(int *host_prot, int prot)
+{
+ int valid = PROT_READ | PROT_WRITE | PROT_EXEC | TARGET_PROT_SEM;
+ int page_flags = (prot & PAGE_BITS) | PAGE_VALID;
+
+ /*
+ * For the host, we need not pass anything except read/write/exec.
+ * While PROT_SEM is allowed by all hosts, it is also ignored, so
+ * don't bother transforming guest bit to host bit. Any other
+ * target-specific prot bits will not be understood by the host
+ * and will need to be encoded into page_flags for qemu emulation.
+ *
+ * Pages that are executable by the guest will never be executed
+ * by the host, but the host will need to be able to read them.
+ */
+ *host_prot = (prot & (PROT_READ | PROT_WRITE))
+ | (prot & PROT_EXEC ? PROT_READ : 0);
+
+#ifdef TARGET_AARCH64
+ {
+ ARMCPU *cpu = ARM_CPU(thread_cpu);
+
+ /*
+ * The PROT_BTI bit is only accepted if the cpu supports the feature.
+ * Since this is the unusual case, don't bother checking unless
+ * the bit has been requested. If set and valid, record the bit
+ * within QEMU's page_flags.
+ */
+ if ((prot & TARGET_PROT_BTI) && cpu_isar_feature(aa64_bti, cpu)) {
+ valid |= TARGET_PROT_BTI;
+ page_flags |= PAGE_BTI;
+ }
+ /* Similarly for the PROT_MTE bit. */
+ if ((prot & TARGET_PROT_MTE) && cpu_isar_feature(aa64_mte, cpu)) {
+ valid |= TARGET_PROT_MTE;
+ page_flags |= PAGE_MTE;
+ }
+ }
+#endif
+
+ return prot & ~valid ? 0 : page_flags;
+}
+
/* NOTE: all the constants are the HOST ones, but addresses are target. */
-int target_mprotect(abi_ulong start, abi_ulong len, int prot)
+int target_mprotect(abi_ulong start, abi_ulong len, int target_prot)
{
abi_ulong end, host_start, host_end, addr;
- int prot1, ret;
-
-#ifdef DEBUG_MMAP
- printf("mprotect: start=0x" TARGET_ABI_FMT_lx
- "len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c\n", start, len,
- prot & PROT_READ ? 'r' : '-',
- prot & PROT_WRITE ? 'w' : '-',
- prot & PROT_EXEC ? 'x' : '-');
-#endif
+ int prot1, ret, page_flags, host_prot;
- if ((start & ~TARGET_PAGE_MASK) != 0)
+ trace_target_mprotect(start, len, target_prot);
+
+ if ((start & ~TARGET_PAGE_MASK) != 0) {
+ return -TARGET_EINVAL;
+ }
+ page_flags = validate_prot_to_pageflags(&host_prot, target_prot);
+ if (!page_flags) {
return -TARGET_EINVAL;
+ }
len = TARGET_PAGE_ALIGN(len);
end = start + len;
- if (!guest_range_valid(start, len)) {
+ if (!guest_range_valid_untagged(start, len)) {
return -TARGET_ENOMEM;
}
- prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
- if (len == 0)
+ if (len == 0) {
return 0;
+ }
mmap_lock();
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 = host_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) {
+ for (addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
prot1 |= page_get_flags(addr);
}
end = host_end;
}
- ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
- if (ret != 0)
+ ret = mprotect(g2h_untagged(host_start), qemu_host_page_size,
+ prot1 & PAGE_BITS);
+ if (ret != 0) {
goto error;
+ }
host_start += qemu_host_page_size;
}
if (end < host_end) {
- prot1 = prot;
- for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ prot1 = host_prot;
+ 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,
- prot1 & PAGE_BITS);
- if (ret != 0)
+ ret = mprotect(g2h_untagged(host_end - qemu_host_page_size),
+ qemu_host_page_size, prot1 & PAGE_BITS);
+ if (ret != 0) {
goto error;
+ }
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);
- if (ret != 0)
+ ret = mprotect(g2h_untagged(host_start),
+ host_end - host_start, host_prot);
+ if (ret != 0) {
goto error;
+ }
}
- page_set_flags(start, start + len, prot | PAGE_VALID);
+ page_set_flags(start, start + len, page_flags);
mmap_unlock();
return 0;
error:
int prot1, prot_new;
real_end = real_start + qemu_host_page_size;
- host_start = g2h(real_start);
+ host_start = g2h_untagged(real_start);
/* get the protection of the target pages outside the mapping */
prot1 = 0;
mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
/* read the corresponding file data */
- if (pread(fd, g2h(start), end - start, offset) == -1)
+ if (pread(fd, g2h_untagged(start), end - start, offset) == -1)
return -1;
/* put final protection */
mprotect(host_start, qemu_host_page_size, prot_new);
}
if (prot_new & PROT_WRITE) {
- memset(g2h(start), 0, end - start);
+ memset(g2h_untagged(start), 0, end - start);
}
}
return 0;
}
#if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
+#ifdef TARGET_AARCH64
+# define TASK_UNMAPPED_BASE 0x5500000000
+#else
# define TASK_UNMAPPED_BASE (1ul << 38)
+#endif
#else
# define TASK_UNMAPPED_BASE 0x40000000
#endif
/* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk
of guest address space. */
-static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
+static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
+ abi_ulong align)
{
- abi_ulong addr;
- abi_ulong end_addr;
+ abi_ulong addr, end_addr, incr = qemu_host_page_size;
int prot;
- int looped = 0;
+ bool looped = false;
if (size > reserved_va) {
return (abi_ulong)-1;
}
- size = HOST_PAGE_ALIGN(size);
+ /* Note that start and size have already been aligned by mmap_find_vma. */
+
end_addr = start + size;
- if (end_addr > reserved_va) {
- end_addr = reserved_va;
+ if (start > reserved_va - size) {
+ /* Start at the top of the address space. */
+ end_addr = ((reserved_va - size) & -align) + size;
+ looped = true;
}
- addr = end_addr - qemu_host_page_size;
+ /* Search downward from END_ADDR, checking to see if a page is in use. */
+ addr = end_addr;
while (1) {
+ addr -= incr;
if (addr > end_addr) {
if (looped) {
+ /* Failure. The entire address space has been searched. */
return (abi_ulong)-1;
}
- end_addr = reserved_va;
- addr = end_addr - qemu_host_page_size;
- looped = 1;
- continue;
- }
- prot = page_get_flags(addr);
- if (prot) {
- end_addr = addr;
- }
- if (addr && addr + size == end_addr) {
- break;
+ /* Re-start at the top of the address space. */
+ addr = end_addr = ((reserved_va - size) & -align) + size;
+ looped = true;
+ } else {
+ prot = page_get_flags(addr);
+ if (prot) {
+ /* Page in use. Restart below this page. */
+ addr = end_addr = ((addr - size) & -align) + size;
+ } else if (addr && addr + size == end_addr) {
+ /* Success! All pages between ADDR and END_ADDR are free. */
+ if (start == mmap_next_start) {
+ mmap_next_start = addr;
+ }
+ return addr;
+ }
}
- addr -= qemu_host_page_size;
- }
-
- if (start == mmap_next_start) {
- mmap_next_start = addr;
}
-
- return addr;
}
/*
* It must be called with mmap_lock() held.
* Return -1 if error.
*/
-abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
+abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align)
{
void *ptr, *prev;
abi_ulong addr;
int wrapped, repeat;
+ align = MAX(align, qemu_host_page_size);
+
/* If 'start' == 0, then a default start address is used. */
if (start == 0) {
start = mmap_next_start;
} else {
start &= qemu_host_page_mask;
}
+ start = ROUND_UP(start, align);
size = HOST_PAGE_ALIGN(size);
if (reserved_va) {
- return mmap_find_vma_reserved(start, size);
+ return mmap_find_vma_reserved(start, size, align);
}
addr = start;
* - mremap() with MREMAP_FIXED flag
* - shmat() with SHM_REMAP flag
*/
- ptr = mmap(g2h(addr), size, PROT_NONE,
+ ptr = mmap(g2h_untagged(addr), size, PROT_NONE,
MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
/* ENOMEM, if host address space has no memory */
if (h2g_valid(ptr + size - 1)) {
addr = h2g(ptr);
- if ((addr & ~TARGET_PAGE_MASK) == 0) {
+ if ((addr & (align - 1)) == 0) {
/* Success. */
if (start == mmap_next_start && addr >= TASK_UNMAPPED_BASE) {
mmap_next_start = addr + size;
/* Assume the result that the kernel gave us is the
first with enough free space, so start again at the
next higher target page. */
- addr = TARGET_PAGE_ALIGN(addr);
+ addr = ROUND_UP(addr, align);
break;
case 1:
/* Sometimes the kernel decides to perform the allocation
at the top end of memory instead. */
- addr &= TARGET_PAGE_MASK;
+ addr &= -align;
break;
case 2:
/* Start over at low memory. */
}
/* NOTE: all the constants are the HOST ones */
-abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
+abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
int flags, int fd, abi_ulong offset)
{
abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
+ int page_flags, host_prot;
mmap_lock();
-#ifdef DEBUG_MMAP
- {
- printf("mmap: start=0x" TARGET_ABI_FMT_lx
- " len=0x" TARGET_ABI_FMT_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 ");
- 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=" TARGET_ABI_FMT_lx "\n", fd, offset);
- }
-#endif
+ trace_target_mmap(start, len, target_prot, flags, fd, offset);
if (!len) {
errno = EINVAL;
goto fail;
}
+ page_flags = validate_prot_to_pageflags(&host_prot, target_prot);
+ if (!page_flags) {
+ errno = EINVAL;
+ goto fail;
+ }
+
/* Also check for overflows... */
len = TARGET_PAGE_ALIGN(len);
if (!len) {
goto fail;
}
+ /*
+ * If we're mapping shared memory, ensure we generate code for parallel
+ * execution and flush old translations. This will work up to the level
+ * supported by the host -- anything that requires EXCP_ATOMIC will not
+ * be atomic with respect to an external process.
+ */
+ if (flags & MAP_SHARED) {
+ CPUState *cpu = thread_cpu;
+ if (!(cpu->tcg_cflags & CF_PARALLEL)) {
+ cpu->tcg_cflags |= CF_PARALLEL;
+ tb_flush(cpu);
+ }
+ }
+
real_start = start & qemu_host_page_mask;
host_offset = offset & qemu_host_page_mask;
if (!(flags & MAP_FIXED)) {
host_len = len + offset - host_offset;
host_len = HOST_PAGE_ALIGN(host_len);
- start = mmap_find_vma(real_start, host_len);
+ start = mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE);
if (start == (abi_ulong)-1) {
errno = ENOMEM;
goto fail;
may need to truncate file maps at EOF and add extra anonymous pages
up to the targets page boundary. */
- if ((qemu_real_host_page_size < qemu_host_page_size) &&
+ if ((qemu_real_host_page_size() < qemu_host_page_size) &&
!(flags & MAP_ANONYMOUS)) {
struct stat sb;
/* Note: we prefer to control the mapping address. It is
especially important if qemu_host_page_size >
qemu_real_host_page_size */
- p = mmap(g2h(start), host_len, prot,
+ p = mmap(g2h_untagged(start), host_len, host_prot,
flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
- if (p == MAP_FAILED)
+ if (p == MAP_FAILED) {
goto fail;
+ }
/* update start so that it points to the file position at 'offset' */
host_start = (unsigned long)p;
if (!(flags & MAP_ANONYMOUS)) {
- p = mmap(g2h(start), len, prot,
+ p = mmap(g2h_untagged(start), len, host_prot,
flags | MAP_FIXED, fd, host_offset);
if (p == MAP_FAILED) {
- munmap(g2h(start), host_len);
+ munmap(g2h_untagged(start), host_len);
goto fail;
}
host_start += offset - host_offset;
* It can fail only on 64-bit host with 32-bit target.
* On any other target/host host mmap() handles this error correctly.
*/
- if (!guest_range_valid(start, len)) {
+ if (end < start || !guest_range_valid_untagged(start, len)) {
errno = ENOMEM;
goto fail;
}
/* msync() won't work here, so we return an error if write is
possible while it is a shared mapping */
if ((flags & MAP_TYPE) == MAP_SHARED &&
- (prot & PROT_WRITE)) {
+ (host_prot & PROT_WRITE)) {
errno = EINVAL;
goto fail;
}
- retaddr = target_mmap(start, len, prot | PROT_WRITE,
+ retaddr = target_mmap(start, len, target_prot | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
if (retaddr == -1)
goto fail;
- if (pread(fd, g2h(start), len, offset) == -1)
+ if (pread(fd, g2h_untagged(start), len, offset) == -1)
goto fail;
- if (!(prot & PROT_WRITE)) {
- ret = target_mprotect(start, len, prot);
+ if (!(host_prot & PROT_WRITE)) {
+ ret = target_mprotect(start, len, target_prot);
assert(ret == 0);
}
goto the_end;
if (real_end == real_start + qemu_host_page_size) {
/* one single host page */
ret = mmap_frag(real_start, start, end,
- prot, flags, fd, offset);
+ host_prot, flags, fd, offset);
if (ret == -1)
goto fail;
goto the_end1;
}
ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
- prot, flags, fd, offset);
+ host_prot, flags, fd, offset);
if (ret == -1)
goto fail;
real_start += qemu_host_page_size;
if (end < real_end) {
ret = mmap_frag(real_end - qemu_host_page_size,
real_end - qemu_host_page_size, end,
- prot, flags, fd,
+ host_prot, flags, fd,
offset + real_end - qemu_host_page_size - start);
if (ret == -1)
goto fail;
offset1 = 0;
else
offset1 = offset + real_start - start;
- p = mmap(g2h(real_start), real_end - real_start,
- prot, flags, fd, offset1);
+ p = mmap(g2h_untagged(real_start), real_end - real_start,
+ host_prot, flags, fd, offset1);
if (p == MAP_FAILED)
goto fail;
}
}
the_end1:
- page_set_flags(start, start + len, prot | PAGE_VALID);
+ if (flags & MAP_ANONYMOUS) {
+ page_flags |= PAGE_ANON;
+ }
+ page_flags |= PAGE_RESET;
+ page_set_flags(start, start + len, page_flags);
the_end:
-#ifdef DEBUG_MMAP
- printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
- page_dump(stdout);
- printf("\n");
-#endif
+ trace_target_mmap_complete(start);
+ if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
+ log_page_dump(__func__);
+ }
tb_invalidate_phys_range(start, start + len);
mmap_unlock();
return start;
real_end -= qemu_host_page_size;
}
if (real_start != real_end) {
- mmap(g2h(real_start), real_end - real_start, PROT_NONE,
+ mmap(g2h_untagged(real_start), real_end - real_start, PROT_NONE,
MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE,
-1, 0);
}
abi_ulong end, real_start, real_end, addr;
int prot, ret;
-#ifdef DEBUG_MMAP
- printf("munmap: start=0x" TARGET_ABI_FMT_lx " len=0x"
- TARGET_ABI_FMT_lx "\n",
- start, len);
-#endif
+ trace_target_munmap(start, len);
+
if (start & ~TARGET_PAGE_MASK)
return -TARGET_EINVAL;
len = TARGET_PAGE_ALIGN(len);
- if (len == 0 || !guest_range_valid(start, len)) {
+ if (len == 0 || !guest_range_valid_untagged(start, len)) {
return -TARGET_EINVAL;
}
if (reserved_va) {
mmap_reserve(real_start, real_end - real_start);
} else {
- ret = munmap(g2h(real_start), real_end - real_start);
+ ret = munmap(g2h_untagged(real_start), real_end - real_start);
}
}
int prot;
void *host_addr;
- if (!guest_range_valid(old_addr, old_size) ||
+ if (!guest_range_valid_untagged(old_addr, old_size) ||
((flags & MREMAP_FIXED) &&
- !guest_range_valid(new_addr, new_size))) {
+ !guest_range_valid_untagged(new_addr, new_size)) ||
+ ((flags & MREMAP_MAYMOVE) == 0 &&
+ !guest_range_valid_untagged(old_addr, new_size))) {
errno = ENOMEM;
return -1;
}
mmap_lock();
if (flags & MREMAP_FIXED) {
- host_addr = mremap(g2h(old_addr), old_size, new_size,
- flags, g2h(new_addr));
+ host_addr = mremap(g2h_untagged(old_addr), old_size, new_size,
+ flags, g2h_untagged(new_addr));
if (reserved_va && host_addr != MAP_FAILED) {
/* If new and old addresses overlap then the above mremap will
} else if (flags & MREMAP_MAYMOVE) {
abi_ulong mmap_start;
- mmap_start = mmap_find_vma(0, new_size);
+ mmap_start = mmap_find_vma(0, new_size, TARGET_PAGE_SIZE);
if (mmap_start == -1) {
errno = ENOMEM;
host_addr = MAP_FAILED;
} else {
- host_addr = mremap(g2h(old_addr), old_size, new_size,
- flags | MREMAP_FIXED, g2h(mmap_start));
+ host_addr = mremap(g2h_untagged(old_addr), old_size, new_size,
+ flags | MREMAP_FIXED,
+ g2h_untagged(mmap_start));
if (reserved_va) {
mmap_reserve(old_addr, old_size);
}
}
}
if (prot == 0) {
- host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
- if (host_addr != MAP_FAILED && reserved_va && old_size > new_size) {
- mmap_reserve(old_addr + old_size, new_size - old_size);
+ host_addr = mremap(g2h_untagged(old_addr),
+ old_size, new_size, flags);
+
+ if (host_addr != MAP_FAILED) {
+ /* Check if address fits target address space */
+ if (!guest_range_valid_untagged(h2g(host_addr), new_size)) {
+ /* Revert mremap() changes */
+ host_addr = mremap(g2h_untagged(old_addr),
+ new_size, old_size, flags);
+ errno = ENOMEM;
+ host_addr = MAP_FAILED;
+ } else if (reserved_va && old_size > new_size) {
+ mmap_reserve(old_addr + old_size, old_size - new_size);
+ }
}
} else {
errno = ENOMEM;
host_addr = MAP_FAILED;
}
- /* Check if address fits target address space */
- if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
- /* Revert mremap() changes */
- host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
- errno = ENOMEM;
- host_addr = MAP_FAILED;
- }
}
if (host_addr == MAP_FAILED) {
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);
+ page_set_flags(new_addr, new_addr + new_size,
+ prot | PAGE_VALID | PAGE_RESET);
}
tb_invalidate_phys_range(new_addr, new_addr + new_size);
mmap_unlock();
projects / mirror_qemu.git / blobdiff