ELF note parser

src/elf/elf.h

@@ -784,15 +784,6 @@ typedef struct
   U16 vs_vers;
 } ELF_ExternalVersym;
 
-typedef struct
-{
-  U32 name_size;
-  U32 desc_size;
-  U32 type;
-  // name + desc
-  // U8  data[1];
-} ELF_Note;
-
 ////////////////////////////////
 // Extensions
 

src/elf/elf_parse.c

@@ -164,3 +164,48 @@ elf_gnu_debug_link_from_bin(String8 raw_data, ELF_Bin *bin)
   }
   return result;
 }
+
+internal ELF_NoteList
+elf_parse_note(Arena *arena, String8 raw_note, ELF_Class elf_class, ELF_MachineKind e_machine)
+{
+  ELF_NoteList result = {0};
+
+  for (U64 cursor = 0; cursor < raw_note.size; ) {
+    U32 owner_size;
+    U64 owner_size_size = str8_deserial_read_struct(raw_note, cursor, &owner_size);
+    if (owner_size_size == 0) { goto exit; }
+    cursor += owner_size_size;
+
+    U32 desc_size;
+    U64 desc_size_size = str8_deserial_read_struct(raw_note, cursor, &desc_size);
+    if (desc_size_size == 0) { goto exit; }
+    cursor += desc_size_size;
+
+    ELF_NoteType type;
+    U64 type_size = str8_deserial_read_struct(raw_note, cursor, &type);
+    if (type_size == 0) { goto exit; }
+    cursor += type_size;
+
+    if (cursor + owner_size > raw_note.size) { goto exit; }
+    String8 owner = str8_cstring_capped(raw_note.str + cursor, raw_note.str + cursor + owner_size);
+    cursor += owner_size;
+
+    if (cursor + desc_size > raw_note.size) { goto exit; }
+    String8 desc = str8_substr(raw_note, r1u64(cursor, cursor + desc_size));
+    cursor += desc_size;
+    cursor = AlignPow2(cursor, 4);
+
+    ELF_NoteNode *n = push_array(arena, ELF_NoteNode, 1);
+    n->v.owner = owner;
+    n->v.desc  = desc;
+    n->v.type  = type;
+
+    SLLQueuePush(result.first, result.last, n);
+    result.count += 1;
+  }
+
+exit:;
+  return result;
+}
+
+

src/elf/elf_parse.h

@@ -10,22 +10,22 @@
 typedef struct ELF_Shdr64Array ELF_Shdr64Array;
 struct ELF_Shdr64Array
 {
+  U64         count;
   ELF_Shdr64 *v;
-  U64 count;
 };
 
 typedef struct ELF_Phdr64Array ELF_Phdr64Array;
 struct ELF_Phdr64Array
 {
+  U64         count;
   ELF_Phdr64 *v;
-  U64 count;
 };
 
 typedef struct ELF_Bin ELF_Bin;
 struct ELF_Bin
 {
-  ELF_Hdr64 hdr;
-  Rng1U64 sh_name_range;
+  ELF_Hdr64       hdr;
+  Rng1U64         sh_name_range;
   ELF_Shdr64Array shdrs;
   ELF_Phdr64Array phdrs;
 };
@@ -34,7 +34,30 @@ typedef struct ELF_GnuDebugLink ELF_GnuDebugLink;
 struct ELF_GnuDebugLink
 {
   String8 path;
-  U32 checksum;
+  U32     checksum;
+};
+
+typedef struct ELF_Note ELF_Note;
+struct ELF_Note
+{
+  String8      owner;
+  ELF_NoteType type;
+  String8      desc;
+};
+
+typedef struct ELF_NoteNode ELF_NoteNode;
+struct ELF_NoteNode
+{
+  ELF_Note      v;
+  ELF_NoteNode *next;
+};
+
+typedef struct ELF_NoteList ELF_NoteList;
+struct ELF_NoteList
+{
+  U64           count;
+  ELF_NoteNode *first;
+  ELF_NoteNode *last;
 };
 
 ////////////////////////////////
@@ -49,4 +72,6 @@ internal String8 elf_name_from_shdr64(String8 raw_data, ELF_Bin *bin, ELF_Shdr64
 internal U64 elf_base_addr_from_bin(ELF_Bin *bin);
 internal ELF_GnuDebugLink elf_gnu_debug_link_from_bin(String8 raw_data, ELF_Bin *bin);
 
+internal ELF_NoteList elf_parse_note(Arena *arena, String8 raw_note, ELF_Class elf_class, ELF_MachineKind e_machine);
+
 #endif // ELF_PARSE_H