NuKVM/memtest86plus
3
0
Fork 0
mirror of https://github.com/memtest86plus/memtest86plus.git synced 2026-08-05 18:57:00 -05:00
Code Issues Packages Projects Releases Wiki Activity

debug_memtest.sh: Extract offsets (also BSS) from code and binary (#562)

Browse Source 
* debug_memtest.sh: Extract offsets from code and binary

Split the Init function so that the binary is built before creating the
gdb script.

The offsets most often subject to change are now determined
automatically instead of being hard-coded.

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>

* debug_memtest.sh: Extract and pass BSS offset to gdb

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>

---------

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>
This commit is contained in:
Tormod Volden
2025-11-24 00:58:58 +01:00
committed by GitHub
parent 492ca4f67f
commit bd03d8a6a1
1 changed files with 20 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
build/x86_64/debug_memtest.sh
+20 -13
View File
@@ -120,15 +120,17 @@ Make() {
}
# Retrieve addresses from code (not used in this version)
# Get_Offsets() {
# IMAGEBASE=$(grep -P '#define\tIMAGE_BASE' header.S | cut -f3)
# BASEOFCODE=$(grep -P '#define\tBASE_OF_CODE' header.S | cut -f3)
# Retrieve addresses from code
Get_Offsets() {
IMAGEBASE=$(grep -P '#define\tIMAGE_BASE' ../../boot/x86/header.S | cut -f4)
BASEOFCODE=$(grep -P '#define\tBASE_OF_CODE' ../../boot/x86/header.S | cut -f3)
DATA=0x$(objdump -t memtest.debug | grep -w _data | cut -d" " -f1)
BSS=0x$(objdump -t memtest.debug | grep -w _bss | cut -d" " -f1)
# TODO: get RELOCADDR and DATA
# }
# TODO: get BASEOFCODE and RELOCADDR (LOW_LOAD_LIMIT in app/main.c)
}
Init() {
Init_Gdb() {
QEMU="qemu-system-x86_64"
QEMU_FLAGS=" -bios OVMF.fd"
@@ -137,13 +139,13 @@ Init() {
QEMU_FLAGS+=" -drive if=pflash,format=raw,file=OVMF_VARS.fd"
# Define offsets for loading of symbol-table
IMAGEBASE=0x200000
Get_Offsets
BASEOFCODE=0x1000
DATA=0x23000
RELOCADDR=0x400000
printf -v OFFSET "0x%X" $(($IMAGEBASE + $BASEOFCODE))
printf -v DATAOFFSET "0x%X" $(($IMAGEBASE + $BASEOFCODE + $DATA))
printf -v BSSOFFSET "0x%X" $(($IMAGEBASE + $BASEOFCODE + $BSS))
printf -v RELOCDATA "0x%X" $(($RELOCADDR + $DATA))
GDB_FILE="gdbscript"
@@ -160,8 +162,8 @@ Init() {
exit 1
fi
echo "add-symbol-file memtest.debug $OFFSET -s .data $DATAOFFSET" >> $GDB_FILE
echo "add-symbol-file memtest.debug $RELOCADDR -s .data $RELOCDATA" >> $GDB_FILE
echo "add-symbol-file memtest.debug $OFFSET -s .data $DATAOFFSET -s .bss $BSSOFFSET" >> $GDB_FILE
echo "add-symbol-file memtest.debug $RELOCADDR -s .data $RELOCDATA -s .bss $BSSOFFSET" >> $GDB_FILE
echo "b main" >> $GDB_FILE
echo "commands" >> $GDB_FILE
@@ -176,7 +178,9 @@ Init() {
echo "info b" >> $GDB_FILE
echo "c" >> $GDB_FILE
fi
}
Init_Lds() {
if [ ! -f ldscripts/memtest_shared.lds ]; then
echo "'memtest_shared.lds' does not exist."
exit 1
@@ -214,12 +218,15 @@ Prepare_Directory() {
# Global checks
Check
# Initialize
Init
# Prepare linker script
Init_Lds
# Build
Make
# Prepare gdb script
Init_Gdb
# Create needed directories and move efi binary to appropriate location
Prepare_Directory