[Trying again... didn't go through last time I sent it...]
I built an ELF executable with a load address of 0xC0000000. Here's what
objdump said about it:
myfile: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 000004d6 C0000000 C0000000 00001000 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
[etc...]
GRUB had some trouble with it, complaining that "Loading below 1MB is not
supported." The commands I used to load it were root (hd0,0); makeactive;
kernel mydir/myfile (Bochs for Win32, FAT file system).
Changing the load address to 0x00200000 solved the problem.
I think this is the GRUB code that gave the error (5.96.1, stage2/boot.c,
lines 110-111):
if (((int) entry_addr) < 0x100000)
errnum = ERR_BELOW_1MB;
Is this a bug? Is it customary to treat 32-bit addresses as signed integers?
If this is a bug, then the fix is straightforward -- for entry_addr and
similar variables, change the type (and explicit casts) to unsigned int. Or
maybe change the types to void*, which will have portability problems on
64-bit machines, but int would have had those problems, too.
I'd be happy to make the patch and test it, but first I'm concerned that
there's a reason why the team picked int rather than unsigned int, such that
my proposed fix wouldn't be appropriate.
--
Mike Tsao
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