From bootsector to C ++ kernel

Question

I decided to write a simple asm loader and C ++ kernel. I read a lot of tutorials, but I can not compile the assembly file as shown below:

[BITS 32]
[global start]
[extern _k_main]
start:
   call _k_main
   cli
   hlt

(I would like to call the k_main function from the c file)

Compile / compile / link errors:

nasm -f bin -o kernelstart.asm -o kernelstart.bin:
error: bin file cannot contain external references

okay, then I tried to create a .o file:

nasm -f aout -o kernelstart.asm -o kernelstart.o  (That right)
ld -i -e _main -Ttext 0x1000 kernel.o kernelstart.o main.o
error: File format not recognized

Someone give me a plz working example or say how to compile.: / (I look through the tutorials and helps 2 days ago, but can not find the correct answer)

Answer 1

I have no direct answer to where your error comes from. However, I see a lot of errors, so I will write them here:

NASM

nasm -f aout -o kernelstart.asm -o kernelstart

Does it even work? It should be something like

nasm -f aout -o kernelstart kernelstart.asm

ld

ld -i -e _main -Ttext 0x1000 kernel.o kernelstart.o main.o

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