On Tuesday, 27 October 2015 at 12:13:13 UTC, guodemone wrote:
sorry,My english is poot.
file asm.h
[...]
Can ldc work with C header files? I don't think it can but I
could be wrong.
Here's how I build my 32-bit bootloader and link with my kernel
main (you will have to replace names etc.):
---
nasm -felf -o kickstart32.o kickstart32.s (I don't have an asm.h)
gdc -m32 -gdwarf-2 -nostdlib -fPIC -c -o kernel32.main.o kmain.d
ld -nodefaultlibs -melf_i386 -z max-page-size=0x1000 -T
linker32.ld -o kernel32.bin kickstart32.o kernel32.main.o
---
For this build setup you will need a linker script. Here's mine
in case you don't have one. 'kickstart' is the entry point in my
kickstart.s. Replace names and offsets as required for your code.
---
/* Use -melf_i386 or -melf64_x86-64
* to specify the architecture
* ld -nodefaultlibs -melf_i386 -z max-page-size=0x1000 -T
<linker_script> -o <output_binary>
*/
ENTRY (kickstart)
SECTIONS{
. = 0x00100000;
.text :{
code = .; _code = .; __code = .;
*(.text)
*(.rodata)
}
.rodata ALIGN (0x1000) : {
*(.rodata)
}
.data ALIGN (0x1000) : {
data = .; _data = .; __data = .;
*(.data)
start_ctors = .; *(.ctors) end_ctors = .;
start_dtors = .; *(.dtors) end_dtors = .;
}
.bss : {
sbss = .;
bss = .; _bss = .; __bss = .;
*(COMMON)
*(.bss)
ebss = .;
}
end = .; _end = .; __end = .;
}
---
I got a lot of info from these sites:
https://www.cs.cmu.edu/~410-s07/p4/p4-boot.pdf
https://en.wikibooks.org/wiki/X86_Assembly/Bootloaders
http://wiki.osdev.org/Bare_bones
(NOTE: wiki.osdev.org has a lot of incorrect information, but it
was useful as a starting point when I got stuck moving to a
64-bit kernel)
bye,
lobo
