Making a symbol dynamic in executable

[Zack Weinberg]

On Fri, Feb 23, 2001 at 06:36:10PM -0800, H . J . Lu wrote:
> On Fri, Feb 23, 2001 at 06:16:01PM -0800, Zack Weinberg wrote:
> > 
> > That implies, to me, that there might be a way to force just one
> > symbol into the dynamic symbol table.  I know very little about this.
> > Worst case (in ELF), couldn't we bodge an entry into .dynsym by hand?
> > 
> 
> Funny you asked. The short answer is no. But we did get a request to add
> STV_EXPORT to the ELF visibility in gABI.

Heh.  I don't think you appreciated what I meant by "bodge an entry
into .dynsym by hand."  This is what I meant:

	.globl __frame_objects
	.data
	.type __frame_objects,@object
	.size __frame_objects,4
__frame_objects:
	.long 0

	.section .dynstr
.Lname:
	.asciz "__frame_objects"

	.section .dynsym
	.long .Lname-.dynstr		# st_name
	.long __frame_objects-.data	# st_value
	.long 4				# st_size
	.byte (1 << 4) + 1		# st_info: (STB_GLOBAL, STT_OBJECT)
	.byte 0				# st_other
	.word 2				# st_shndx (assumed data==2)
	
This generates an object file with an apparently correct dynamic
symbol table, but the linker strips it when you try to put it into an
executable.  Oh well.

zw