1 files changed, 17 insertions, 4 deletions
diff --git a/lib/execmem.h b/lib/execmem.h
index b4860e9..895769d 100644
--- a/lib/execmem.h
+++ b/lib/execmem.h
@@ -1,9 +1,22 @@
 #pragma once
-#include <stdlib.h>
-/* Write to a foreign page which is already RX / with unknown permissions. */
-int execmem_write(void *dest, const void *src, size_t len);
-
+#include <sys/types.h>
 /* For allocating trampolines - this is just a mmap wrapper. */
 int execmem_alloc_unsealed(uintptr_t hint, void **page_p, size_t *size_p);
 int execmem_seal(void *page);
 void execmem_free(void *page);
+
+/* Write to foreign pages which are already RX or have unknown permissions.
+ * If callback is not NULL, run it on all other threads 'atomically', in the
+ * sense that it will be called on any thread which executed any of the old
+ * instructions in the write region.
+ * Oh, and it might mutate writes (to sort it). */
+struct execmem_foreign_write {
+    void *dst;
+    const void *src;
+    size_t len;
+};
+typedef uintptr_t (*execmem_pc_patch_callback)(void *ctx, uintptr_t pc);
+int execmem_foreign_write_with_pc_patch(struct execmem_foreign_write *writes,
+                                        size_t nwrites,
+                                        execmem_pc_patch_callback callback,
+                                        void *callback_ctx);