layer for interfacing with GNU

src/gnu/gnu.h

@@ -0,0 +1,58 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef GNU_H
+#define GNU_H
+
+typedef struct GNU_LinkMap64
+{
+  U64 addr_vaddr;
+  U64 name_vaddr;
+  U64 ld_vaddr;   // address of the dynamic section
+  U64 next_vaddr;
+  U64 prev_vaddr;
+} GNU_LinkMap64;
+
+typedef struct GNU_LinkMap32
+{
+  U32 addr_vaddr;
+  U32 name_vaddr;
+  U32 ld_vaddr;
+  U32 next_vaddr;
+  U32 prev_vaddr;
+} GNU_LinkMap32;
+
+typedef U32 GNU_RT;
+enum
+{
+  GNU_RT_Consistent = 0,
+  GNU_RT_Add        = 1,
+  GNU_RT_Delete     = 2,
+};
+
+// struct reflects r_debug from /usr/include/link.h
+typedef struct GNU_RDebugInfo64
+{
+  S32    r_version; // must be greater than 0
+  U64    r_map;     // address of first loaded object
+  U64    r_brk;     // when module is loared/unloaded DL calls this function
+  GNU_RT r_state;
+  U64    r_ldbase;  // base addres of dynamic linker
+} GNU_RDebugInfo64;
+
+typedef struct GNU_RDebugInfo32
+{
+  S32    r_version;
+  U32    r_map;
+  U32    r_brk;
+  GNU_RT r_state;
+  U32    r_ldbase;
+} GNU_RDebugInfo32;
+
+////////////////////////////////
+
+internal GNU_LinkMap64 elf_linkmap64_from_linkmap32(GNU_LinkMap32 linkmap32);
+internal U64 gnu_rdebug_info_size_from_arch(Arch arch);
+internal U64 gnu_r_brk_offset_from_arch(Arch arch);
+
+#endif // GNU_H