Signed-off-by: Emilio G. Cota <c...@braap.org>
---
include/qemu/osdep.h | 2 ++
util/osdep.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 3cb36e6..dcecfbc 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -348,6 +348,8 @@ void sigaction_invoke(struct sigaction *action,
#endif
int qemu_madvise(void *addr, size_t len, int advice);
+int qemu_mprotect_rwx(void *addr, size_t size);
+int qemu_mprotect_none(void *addr, size_t size);
int qemu_open(const char *name, int flags, ...);
int qemu_close(int fd);
diff --git a/util/osdep.c b/util/osdep.c
index 90f4f11..85df97e 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -90,6 +90,46 @@ int qemu_madvise(void *addr, size_t len, int advice)
#endif
}
+static int qemu_mprotect__osdep(void *addr, size_t size, int prot)
+{
+ void *start = QEMU_ALIGN_PTR_DOWN(addr, qemu_real_host_page_size);
+ void *end = QEMU_ALIGN_PTR_UP(addr + size, qemu_real_host_page_size);
+#ifdef _WIN32
+ DWORD old_protect;
+
+ if (!VirtualProtect(start, end - start, prot, &old_protect)) {
+ error_report("%s: VirtualProtect failed with error code %d",
+ __func__, GetLastError());
+ return -1;
+ }
+ return 0;
+#else
+ if (mprotect(start, end - start, prot)) {
+ error_report("%s: mprotect failed: %s", __func__, strerror(errno));
+ return -1;
+ }
+ return 0;
+#endif
+}
+
+int qemu_mprotect_rwx(void *addr, size_t size)
+{
+#ifdef _WIN32
+ return qemu_mprotect__osdep(addr, size, PAGE_EXECUTE_READWRITE);
+#else
+ return qemu_mprotect__osdep(addr, size, PROT_READ | PROT_WRITE |
PROT_EXEC);
+#endif
+}
+
+int qemu_mprotect_none(void *addr, size_t size)
+{
+#ifdef _WIN32
+ return qemu_mprotect__osdep(addr, size, PAGE_NOACCESS);
+#else
+ return qemu_mprotect__osdep(addr, size, PROT_NONE);
+#endif
+}
+
#ifndef _WIN32
/*
* Dups an fd and sets the flags
--
2.7.4
