Populate the memory map structure

src/hiload.c

@@ -21,7 +21,7 @@ typedef struct {
 } ModuleInfos;
 
 typedef struct {
-  struct sc_array_memreg *memory_regions;
+  struct sc_array_memreg memory_regions;
 } HiloadContext;
 
 static HiloadContext context = {0};
@@ -267,7 +267,7 @@ int hi_init() {
   sc_log_set_level("DEBUG");
 
 
-  if (read_memory_maps_self(context.memory_regions) != HILOAD_OK) {
+  if (read_memory_maps_self(&context.memory_regions) != HILOAD_OK) {
     sc_log_error("Could not populate program memory maps.\n");
     return HILOAD_FAIL;
   }

src/memory.c

@@ -4,22 +4,68 @@
 #include "logger.h"
 #include "types.h"
 
-void hi_clear_memreg(struct sc_array_memreg *regions)
-{
-  MemoryRegions *reg;
-  sc_array_foreach(regions, *reg) {
-
-  }
-}
-
 HiloadResult read_memory_maps_self(struct sc_array_memreg *regions) {
   str memory_str = str_null;
 
+  sc_array_clear(regions);
+  sc_array_init(regions);
+
   HiloadResult res = read_stream_to_str(&memory_str, "/proc/self/maps");
   if (res == HILOAD_FAIL)
     return HILOAD_FAIL;
 
+  int i = 0;
+
+  MemoryRegions reg = {0};
+  char *strptr = (char *)str_ptr(memory_str);
+  char *line = strtok(strptr, "\n");
+  while (line) {
+
+    if (i >= HI_MEM_REG_MAX) {
+      sc_array_add(regions, reg);
+      memset(&reg, 0, sizeof(reg));
+      i = 0;
+    }
+
+    char perm_str[5];
+    u32 dev_major;
+    u32 dev_minor;
+    char pathname[256];
+
+    // clang-format off
+    // Example from `cat /proc/self/maps`
+    // 7fa0b66ca000-7fa0b66cc000 rw-p 00033000 fe:02 28063911 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
+    int result = sscanf(line, "%lx-%lx %4s %lx %x:%x %lu %255s",
+                        &reg.region_starts[i],
+                        &reg.region_ends[i],
+                        perm_str,
+                        &reg.offsets[i],
+                        &dev_major,
+                        &dev_minor,
+                        &reg.inodes[i],
+                        pathname);
+
+    if (perm_str[0] == 'r') reg.permissions[i] |= HI_MEMORY_READ;
+    if (perm_str[1] == 'w') reg.permissions[i] |= HI_MEMORY_WRITE;
+    if (perm_str[2] == 'x') reg.permissions[i] |= HI_MEMORY_EXECUTE;
+    if (perm_str[3] == 'p') reg.permissions[i] |= HI_MEMORY_PRIVATE;
+    if (perm_str[3] == 's') reg.permissions[i] |= HI_MEMORY_SHARED;
+
+    // pathname could be empty, so we check for it
+    if (result >= 8) {
+      reg.pathnames[i] = strdup(pathname);
+    }
+
+    i++;
+    line = strtok(NULL, "\n");
+  }
+
+  // clang-format on
+  sc_array_add(regions, reg);
+
   sc_log_debug("Memory Map\n-- /proc/self/maps:\n%s\n", str_ptr(memory_str));
 
+  str_free(memory_str);
+
   return HILOAD_OK;
 }

src/memory.h

@@ -7,30 +7,30 @@
 
 #include <assert.h>
 
-enum MemoryPermissions {
+typedef enum {
   HI_MEMORY_READ = 1 << 0,
   HI_MEMORY_WRITE = 1 << 1,
   HI_MEMORY_EXECUTE = 1 << 2,
   HI_MEMORY_SHARED = 1 << 3,
   HI_MEMORY_PRIVATE = 1 << 4
-};
+} MemoryPermissions;
 
 #define HI_MEM_REG_MAX 256
 typedef struct {
-  void *region_starts[HI_MEM_REG_MAX];
+  uptr region_starts[HI_MEM_REG_MAX];
-  void *region_end[HI_MEM_REG_MAX];
+  uptr region_ends[HI_MEM_REG_MAX];
-  u32 region_flags[HI_MEM_REG_MAX]; // enum MemoryPermissions
+  uptr offsets[HI_MEM_REG_MAX];
-  u32 offset[HI_MEM_REG_MAX];
+  u64 inodes[HI_MEM_REG_MAX];
-  str pathname[HI_MEM_REG_MAX];
+  u32 permissions[HI_MEM_REG_MAX]; // enum MemoryPermissions
+  const char *pathnames[HI_MEM_REG_MAX];
 } MemoryRegions;
 
+
+
 sc_array_def(MemoryRegions, memreg);
-_Static_assert(sizeof(MemoryRegions) < 1024 * 11, "MemoryRegion size has increased. Fix this assert.");
+_Static_assert(sizeof(MemoryRegions) < 1024 * 12, "MemoryRegion size has increased. Fix this assert.");
 
-/* Needed to free the underlying pathnames before clear */
+/* A pointer that can be used to place the memory regions into. Clears regions before use, but uses the same buffer. */
-void hi_clear_memreg(struct sc_array_memreg *regions);
-
-/* A pointer that can be used to place the memory regions into. If mr isn't cleared, the content will be cleared. */
 HiloadResult read_memory_maps_self(struct sc_array_memreg *regions);
 
 #endif // MEMORY_H_

src/types.h

@@ -2,6 +2,7 @@
 #define TYPES_H_
 
 #include <stdint.h>
+#include <stddef.h>
 
 typedef uint8_t u8;
 typedef uint16_t u16;
@@ -14,6 +15,9 @@ typedef int64_t i64;
 typedef float f32;
 typedef double f64;
 
+typedef uintptr_t uptr;
+typedef ptrdiff_t ptrdiff;
+
 typedef enum { HILOAD_OK = 0, HILOAD_FAIL } HiloadResult;
 
 #endif // TYPES_H_