layer for interfacing with GNU

src/gnu/gnu.c

@@ -0,0 +1,53 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+internal GNU_LinkMap64
+gnu_linkmap64_from_linkmap32(GNU_LinkMap32 linkmap32)
+{
+  GNU_LinkMap64 linkmap64 = {0};
+  linkmap64.addr_vaddr = linkmap32.addr_vaddr;
+  linkmap64.name_vaddr = linkmap32.name_vaddr;
+  linkmap64.ld_vaddr   = linkmap32.ld_vaddr;
+  linkmap64.next_vaddr = linkmap32.next_vaddr;
+  linkmap64.prev_vaddr = linkmap32.prev_vaddr;
+  return linkmap64;
+}
+
+internal U64
+gnu_rdebug_info_size_from_arch(Arch arch)
+{
+  U64 size = 0;
+  switch (byte_size_from_arch(arch)) {
+  case 0: break;
+  case 4: size = sizeof(GNU_RDebugInfo32); break;
+  case 8: size = sizeof(GNU_RDebugInfo64); break;
+  default: InvalidPath; break;
+  }
+  return size;
+}
+
+internal U64
+gnu_r_brk_offset_from_arch(Arch arch)
+{
+  U64 offset = 0;
+  switch (gnu_rdebug_info_size_from_arch(arch)) {
+  case 0: offset = 0; break;
+  case sizeof(GNU_RDebugInfo32): offset = OffsetOf(GNU_RDebugInfo32, r_brk); break;
+  case sizeof(GNU_RDebugInfo64): offset = OffsetOf(GNU_RDebugInfo64, r_brk); break;
+  default: InvalidPath; break;
+  }
+  return offset;
+}
+
+internal GNU_RDebugInfo64
+gnu_rdebug_info64_from_rdebug_info32(GNU_RDebugInfo32 rdebug32)
+{
+  GNU_RDebugInfo64 result = {0};
+  result.r_version = rdebug32.r_version;
+  result.r_map     = rdebug32.r_map;
+  result.r_brk     = rdebug32.r_brk;
+  result.r_state   = rdebug32.r_state;
+  result.r_ldbase  = rdebug32.r_ldbase;
+  return result;
+}
+

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

src/raddbg/raddbg_main.c

@@ -210,6 +210,7 @@
 #include "pe/pe.h"
 #include "elf/elf.h"
 #include "elf/elf_parse.h"
+#include "gnu/gnu.h"
 #include "codeview/codeview.h"
 #include "codeview/codeview_parse.h"
 #include "msf/msf.h"
@@ -257,6 +258,7 @@
 #include "pe/pe.c"
 #include "elf/elf.c"
 #include "elf/elf_parse.c"
+#include "gnu/gnu.c"
 #include "codeview/codeview.c"
 #include "codeview/codeview_parse.c"
 #include "msf/msf.c"