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OverwriteMalloc.h

@@ -0,0 +1,89 @@
+//
+// Created by Akilan on 07/03/2024.
+//
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include <dlfcn.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+#include <assert.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define FILENAME "/dev/contigmem"
+
+
+
+static inline void *MALLOC(size_t size)
+{
+//    void * temp = malloc(size);
+//    assert(temp);
+//    return temp;
+
+// Ensuring malloc this is mmap and phyiscally contigous
+    
+    // void *ptr = malloc(size);
+    // return ptr;
+}
+
+// Currently not implementing free
+// This is to ensure the PureCap
+// program can terminate itself
+// even though there is memory not
+// cleared.
+static inline void *FREE(void *ptr)
+{
+    // int *pt = ptr;
+    // size_t size;
+    // --pt;
+    // size = *pt;
+    // if(munmap(pt, size) == -1)
+    // {
+    //     perror("munmap");
+    //     exit(EXIT_FAILURE);
+    // }
+    // free(ptr);
+}
+
+
+inline void *MALLOCPHYSICALLCONTIGOUS(size_t size) {
+    int fd = open
+            (FILENAME, O_RDWR | O_CREAT, 0600);
+    if (fd < 0) {
+        perror("open");
+        exit(EXIT_FAILURE);
+    }
+
+    off_t offset = 0; // offset to seek to.
+
+    if (ftruncate(fd, size) < 0) {
+        perror("ftruncate");
+        close(fd);
+        exit(EXIT_FAILURE);
+    }
+
+    int *ptr = mmap(NULL, size,
+                    PROT_READ | PROT_WRITE, MAP_SHARED,
+                    fd, offset);
+    if(ptr == MAP_FAILED)
+    {
+        perror("mmap");
+        exit(EXIT_FAILURE);
+    }
+
+    *ptr = size;
+
+    return ptr;
+}
+