CODEWITHSUNDEEP
gccassemblylinkernasmld
JStefanelli
JStefanelli

Reputation: 143

Missing debug information from NASM and GCC

I am building a small OS exectuable and i have issues with the linking process using NASM, GCC and GNU Binutils.
I am linking multiple types of object files:

When I link toghether these files with a custom linker script and then re-read the degub information, I only find the debug info from the first object file linked (ordered by effective address).

For reference purposes, I'll post a couple of the lines that i use to compile:

nasm -g -felf32 -F dwarf entry.asm -o "build/entry.o"  
gcc -c main.c -o "build/main.o" -m32 -mtune=i386 -gdwarf

And link: 

ld -Tlinker.ld -m elf_i386 --nmagic -nostdlib -static -o "build/bootload.elf" -M -g > "build/map.txt"

I Use GCC v. 6.2, Binutils v. 2.27 and NASM v. 2.12
I'll post bits of the linker script if needed. Please help, debugging without line information is very annoying.

Upvotes: 0

Views: 322

Answers (1)

JStefanelli
JStefanelli

Reputation: 143

Fixed.
The problem, as suggested by @Jester(thanks), was in the linker script.
I was putting every object file section inside the .text section of the final ELF file. I'll post some code to explain the old and new, corrected behaviour:

OLD:

.text : AT(0x800) {
    test.o(*);
}

NEW:

.text : AT(0x800) {
    test.o(.text);
    test.o(.data);
    test.o(.bss);
}

All this code is for the linker script.

Upvotes: 1

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