lightrec: use mmap() for code buffer if possible

When not using the custom memory map, the code buffer was simply
malloc'd. This only works if the memory returned has no protection,
which is not the case e.g. on Linux.

If mmap() is available, use it to allocate the code buffer, so that the
proper memory protection flags can be used.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

diff --git a/libpcsxcore/lightrec/plugin.c b/libpcsxcore/lightrec/plugin.c
index 8d96c0a..72201c1 100644 (file)
--- a/libpcsxcore/lightrec/plugin.c
+++ b/libpcsxcore/lightrec/plugin.c
@@ -6,6 +6,10 @@
 #include <signal.h>
 #include <assert.h>
 
+#if P_HAVE_MMAP
+#include <sys/mman.h>
+#endif
+
 #include "../cdrom.h"
 #include "../gpu.h"
 #include "../gte.h"
@@ -436,9 +440,17 @@ static int lightrec_plugin_init(void)
        lightrec_map[PSX_MAP_PARALLEL_PORT].address = psxP;
 
        if (!LIGHTREC_CUSTOM_MAP) {
+#if P_HAVE_MMAP
+               code_buffer = mmap(0, CODE_BUFFER_SIZE,
+                                  PROT_EXEC | PROT_READ | PROT_WRITE,
+                                  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+               if (code_buffer == MAP_FAILED)
+                       return -ENOMEM;
+#else
                code_buffer = malloc(CODE_BUFFER_SIZE);
                if (!code_buffer)
                        return -ENOMEM;
+#endif
        }
 
        if (LIGHTREC_CUSTOM_MAP) {
@@ -571,8 +583,13 @@ static void lightrec_plugin_shutdown(void)
 {
        lightrec_destroy(lightrec_state);
 
-       if (!LIGHTREC_CUSTOM_MAP)
+       if (!LIGHTREC_CUSTOM_MAP) {
+#if P_HAVE_MMAP
+               munmap(code_buffer, CODE_BUFFER_SIZE);
+#else
                free(code_buffer);
+#endif
+       }
 }
 
 static void lightrec_plugin_reset(void)