ASM function calling error (wrong efective address)

[suthers]

Wow thanks man, that's really helpful, but now I get this error:

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/cygdrive/c/toolchain/ld: cannot perform PE operations on non PE output file 'a.
exe'.

I thought that was one of the errors you use a cross binutils/compiler to get around...
Thanks in advance,

Jules

[suthers]

Well, if I just use the cross compiler and still use my version of ld, I still get the wrong addresses though...
Thanks for putting me out of my misery by the way...
And have I ever told you how much I appreciate your work as an admin
Thanks in advance,

Jules

[suthers]

Since I pressume you have no problem with calling asm functions, I presume the problems my linker is at fault...
So I'll try to see what I can do with the format to make your linker happy...
Jules

[Combuster]

You're still using the host platform's linker (ld), not the cross-linker (i386-elf-ld)
(I bet the same holds for gcc vs i386-elf-gcc)

[suthers]

, I am now officially retarded....
I haven't tried it, give me a second, but...
Thanks,

Jules

[suthers]

Damn it..., God,why must you thwart me at each stage of my plan to overtake the world with my super OS
I am now using the i386-elf- cross binutils/compiler, but know GCC is demanding cc1, I've put cc1 in the same file as it, but it still says no such file or directory...
I don't know what to do... damn win32...
Any help?
Thanks in advance,

Jules

P.S. I realise this forum isn't for idiots who can't get their compiler working, but could you make a special exception for me

[Omega]

Sorry if this is wasting your time but it looks like you're trying to do this:

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void switch_page_directory(page_directory_t *dir)
{
    current_directory = dir;
    asm volatile("mov %0, %%cr3":: "r"(&dir->tablesPhysical));
    u32int cr0;
    asm volatile("mov %%cr0, %0": "=r"(cr0));
    cr0 |= 0x80000000; // Enable paging!
    asm volatile("mov %0, %%cr0":: "r"(cr0));
}

Just got mine working last night thanks to JamesM's awesome tutorial, and this is code from that tutorial. Hope it helps.

[suthers]

Sorry if this is wasting your time but it looks like you're trying to do this:

Code: Select all

void switch_page_directory(page_directory_t *dir)
{
    current_directory = dir;
    asm volatile("mov %0, %%cr3":: "r"(&dir->tablesPhysical));
    u32int cr0;
    asm volatile("mov %%cr0, %0": "=r"(cr0));
    cr0 |= 0x80000000; // Enable paging!
    asm volatile("mov %0, %%cr0":: "r"(cr0));
}

Just got mine working last night thanks to JamesM's awesome tutorial, and this is code from that tutorial. Hope it helps.

yah that was exactly what I was trying to do and I'll implement it this way, but it's still an issue I need to fix...
Jules

[Omega]

I had the same issue you are having and I solved it by assembling as COFF. I use DJGPP so I had to:

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global start, _start
start:
_start:

That makes start callable from C in DJGPP. I don't think you need the underscore for GCC (Linux).

Then in your C file you do:

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extern void start(void);

And that should work. Good luck.

[suthers]

Thanks,

but what's with the start, then _start, why do you do that?
Thanks in advance,

Jules

[Omega]

You may not have to because I don't do that in my HAL.asm but I needed to in my loader because I am using GRUB for stage 1 and 2 and I saw in the GRUB Multiboot specs example code the use of that and without it I could not get my code to work like with my HAL.asm, so once I added that it worked, so maybe for you it will too. So, the short answer is I think it is a linker/djgpp thing. It may not relate to your problem.

[suthers]

Ok I'll try..
Jules