Problems with new binutils, -mbss-plt and prelink

[Alan Modra]

On Fri, Jul 29, 2005 at 02:39:45PM +0200, Jakub Jelinek wrote:
> But current binutils put it at the end of .got instead (the 4 word block,
> containing 0x4e800021 (blrl insn), address of _DYNAMIC without relocation
> and 2 zeros.  Can I at least rely on it being either at the beginning or
> at the end of .got section (and check whether the 2 initial values are ok
> and no relocations are against those 4 values)?

For old binutils, it will be at the beginning of .got.  For new
binutils, it will always be at the lesser of .got size and 32k.
More precisely:

binutils	layout		.got size		g_o_t
old		old		16 to 32768		4
new		old		16 to 32776		size - 12
		old		32780 to 65536		32768
		secure		12 to 32776		size - 12
		secure		32780 to 65536		32768

Writing out this table made me realize there is a bug in the current
code for old layout >= 32780.  I'll fix it later today.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre