From e61d488e0f642f03d344a044a32f04abb789bd3d Mon Sep 17 00:00:00 2001
From: Tom Bloor <tom@tbsliver.me>
Date: Tue, 31 Dec 2024 00:21:38 +0000
Subject: [PATCH] Add section headers for better debugging

---
 programs/return-42/00_elf_header.txt          |  8 ++---
 programs/return-42/03_string_table.txt        |  3 ++
 programs/return-42/04_section_header_null.txt | 29 +++++++++++++++++++
 .../return-42/05_section_header_program.txt   | 29 +++++++++++++++++++
 .../06_section_header_string_table.txt        | 29 +++++++++++++++++++
 5 files changed, 94 insertions(+), 4 deletions(-)
 create mode 100644 programs/return-42/03_string_table.txt
 create mode 100644 programs/return-42/04_section_header_null.txt
 create mode 100644 programs/return-42/05_section_header_program.txt
 create mode 100644 programs/return-42/06_section_header_string_table.txt

diff --git a/programs/return-42/00_elf_header.txt b/programs/return-42/00_elf_header.txt
index e26537a..d0f1b9e 100644
--- a/programs/return-42/00_elf_header.txt
+++ b/programs/return-42/00_elf_header.txt
@@ -48,8 +48,8 @@
 40 00 00 00 00 00 00 00
 
 # Section Header Table Offset - e_shoff
-# We dont have one! no offset
-00 00 00 00 00 00 00 00
+# 64 + 56 + 16 + 16
+98 00 00 00 00 00 00 00
 
 # Processor Flags - e_flags - No flags set
 00 00 00 00
@@ -68,9 +68,9 @@
 
 # Section Header Count - e_shnum
 # Set to 3 based on example
-00 00
+03 00
 
 ##Section Header String Table Index - e_shstrndx
 # Set to 2 based on example
-00 00
+02 00
 
diff --git a/programs/return-42/03_string_table.txt b/programs/return-42/03_string_table.txt
new file mode 100644
index 0000000..1f8d71c
--- /dev/null
+++ b/programs/return-42/03_string_table.txt
@@ -0,0 +1,3 @@
+# String table. ".shstrab\0.text\0" -- 16 bytes
+2e 73 68 73 74 72 74 61 62 00 2e 74 65 78 74 00
+
diff --git a/programs/return-42/04_section_header_null.txt b/programs/return-42/04_section_header_null.txt
new file mode 100644
index 0000000..e420139
--- /dev/null
+++ b/programs/return-42/04_section_header_null.txt
@@ -0,0 +1,29 @@
+# Section header table, section 0 -- null -- 64 bytes
+
+# 0x0A = offset to the name of the section in the string table
+00 00 00 00
+
+# 1 = type: null
+00 00 00 00
+
+# flags = executable | occupies memory
+00 00 00 00 00 00 00 00
+
+# address in virtual memory of this section
+00 00 00 00 00 00 00 00
+
+# offset in the file of this section (start of program code)
+00 00 00 00 00 00 00 00
+
+# size of this section in the file: 16 bytes
+00 00 00 00 00 00 00 00
+
+# sh_link -- not used for this section
+00 00 00 00 00 00 00 00
+
+# 0x01 = alignment code: default??
+00 00 00 00 00 00 00 00
+
+# sh_entsize: not used
+00 00 00 00 00 00 00 00
+
diff --git a/programs/return-42/05_section_header_program.txt b/programs/return-42/05_section_header_program.txt
new file mode 100644
index 0000000..028fb23
--- /dev/null
+++ b/programs/return-42/05_section_header_program.txt
@@ -0,0 +1,29 @@
+# Section header table, section 1 -- program text -- 64 bytes
+
+# 0x0A = offset to the name of the section in the string table
+0a 00 00 00
+
+# 1 = type: program data
+01 00 00 00
+
+# flags = executable | occupies memory
+06 00 00 00 00 00 00 00
+
+# address in virtual memory of this section
+78 00 40 00 00 00 00 00
+
+# offset in the file of this section (start of program code)
+78 00 00 00 00 00 00 00
+
+# size of this section in the file: 16 bytes
+10 00 00 00 00 00 00 00
+
+# sh_link -- not used for this section
+00 00 00 00 00 00 00 00
+
+# 0x01 = alignment code: default??
+01 00 00 00 00 00 00 00
+
+# sh_entsize: not used
+00 00 00 00 00 00 00 00
+
diff --git a/programs/return-42/06_section_header_string_table.txt b/programs/return-42/06_section_header_string_table.txt
new file mode 100644
index 0000000..a4655ee
--- /dev/null
+++ b/programs/return-42/06_section_header_string_table.txt
@@ -0,0 +1,29 @@
+# Section header table, section 2 -- string table
+
+# 0x0 = offset to the name of the section in the string table
+00 00 00 00
+
+# 3 = type: string table
+03 00 00 00
+
+# 0x0 = flags
+00 00 00 00 00 00 00 00
+
+# 0x0 = address in virtual memory (not used)
+00 00 00 00 00 00 00 00
+
+# 0xB0 = offset in the file of this section (start of string table)
+b0 00 00 00 00 00 00 00
+
+# 0x10 = size of this section in the file: 16 bytes
+10 00 00 00 00 00 00 00
+
+# sh_link -- not used for this section
+00 00 00 00 00 00 00 00
+
+# 0x01 = alignment code: default??
+01 00 00 00 00 00 00 00
+
+# sh_entsize: not used
+00 00 00 00 00 00 00 00
+