Commit 5fa64b31 authored by Emilio G. Cota's avatar Emilio G. Cota Committed by Richard Henderson
Browse files

osdep: introduce qemu_mprotect_rwx/none 



Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
Signed-off-by: default avatarEmilio G. Cota <cota@braap.org>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
parent 34184b07

include/qemu/osdep.h

+2 −0
Original line number Diff line number Diff line
@@ -371,6 +371,8 @@ 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);

util/osdep.c

+41 −0
Original line number Diff line number Diff line
@@ -73,6 +73,47 @@ int qemu_madvise(void *addr, size_t len, int advice) 
#endif

}



static int qemu_mprotect__osdep(void *addr, size_t size, int prot)

{

    g_assert(!((uintptr_t)addr & ~qemu_real_host_page_mask));

    g_assert(!(size & ~qemu_real_host_page_mask));



#ifdef _WIN32

    DWORD old_protect;



    if (!VirtualProtect(addr, size, prot, &old_protect)) {

        error_report("%s: VirtualProtect failed with error code %ld",

                     __func__, GetLastError());

        return -1;

    }

    return 0;

#else

    if (mprotect(addr, size, 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



static int fcntl_op_setlk = -1;