Initial commit

2025-10-06 00:14:04 -04:00
commit d98bdabb74
553 changed files with 32764 additions and 0 deletions
--- a/p2-load/p2-load.c
+++ b/p2-load/p2-load.c
@@ -0,0 +1,96 @@
+/*
+ * CS 261 PA2: Mini-ELF loader
+ *
+ * Name: Nicholas Tamassia
+ * This code was developed in compliance with the JMU Honor Code.
+ */
+
+#include "p2-load.h"
+
+/**********************************************************************
+ *                         REQUIRED FUNCTIONS
+ *********************************************************************/
+
+bool read_phdr (FILE *file, uint16_t offset, elf_phdr_t *phdr)
+{
+    if (!file || !phdr || fseek(file, offset, SEEK_SET) != 0) {
+        return false;
+    }
+
+    return ((fread(phdr, sizeof(elf_phdr_t), 1, file) == 1) && phdr->magic == 0xDEADBEEF);
+}
+
+bool load_segment (FILE *file, byte_t *memory, elf_phdr_t *phdr)
+{
+    if (!file || !memory || !phdr) {
+        return false;
+    }
+
+    if (phdr->p_vaddr + phdr->p_size > MEMSIZE || fseek(file, phdr->p_offset, SEEK_SET) != 0) {
+        return false;
+    }
+
+    if ((fread(memory + phdr->p_vaddr, phdr->p_size, 1, file) != 1) && phdr->p_size != 0) {
+        return false;
+    }
+
+    return true;
+}
+
+/**********************************************************************
+ *                         OPTIONAL FUNCTIONS
+ *********************************************************************/
+
+void dump_phdrs (uint16_t numphdrs, elf_phdr_t *phdrs)
+{
+    printf(" Segment   Offset    Size      VirtAddr  Type      Flags\n");
+
+    for (int i = 0; i < numphdrs; i++) {
+        elf_phdr_t phdr = phdrs[i];
+        char flags[4] = "RWX";
+
+        for (int j = 2; j >= 0; j--) {
+            if ((phdr.p_flags & (1 << (2 - j))) == 0) {
+                flags[j] = ' ';
+            }
+        }
+
+        printf("  %02d       0x%04x    0x%04x    0x%04x    %-10s%s\n", i, phdr.p_offset, phdr.p_size, phdr.p_vaddr, p_type_mapper(phdr.p_type), flags);
+    }
+}
+
+char* p_type_mapper(uint16_t type) {
+    switch (type) {
+        case 0: return "DATA"; break;
+        case 1: return "CODE"; break;
+        case 2: return "STACK"; break;
+        case 3: return "HEAP"; break;
+        default: return "UNKNOWN"; break;
+    }
+}
+
+void dump_memory (byte_t *memory, uint16_t start, uint16_t end)
+{
+    printf("Contents of memory from %04x to %04x:\n", start, end);
+
+    int aligned_start = start - (start % 16);
+
+    for (int i = aligned_start; i < end; i++) {
+        if (i % 16 == 0) {
+            printf("  %04x ", i);
+        }
+
+        if (i >= start) {
+            printf(" %02x", memory[i]);
+        } else {
+            printf("   ");
+        }
+        
+        if (i % 16 == 15 || i == end - 1) {
+            printf("\n");
+        } else if (i % 16 == 7) {
+            printf(" ");
+        }
+    }
+}
+