[PATCH] Fix i386 GD->IE TLS transition

[H. J. Lu]

On Fri, Jun 23, 2006 at 04:00:51PM +0200, Jakub Jelinek wrote:
> Hi!
> 
> #!/bin/sh
> CFLAGS="-g -m32 -O2"
> gcc $CFLAGS -fpic -c -o a.o -xc - <<EOF
> extern __thread int data; extern int *foo (void); extern void abort (void);
> int main (void) { if (foo () != &data) abort (); return 0; }
> EOF
> gcc $CFLAGS -c -o b.o -xc - <<EOF
> extern __thread int data;
> int *foo (void) { return &data; }
> EOF
> echo '__thread int data;' | gcc $CFLAGS -c -o c.o -xc -
> gcc $CFLAGS -Wl,--export-dynamic -o test a.o b.o c.o
> ./test; echo $?
> 
> is mis-linked, as the GOT slot contains R_386_TPOFF value (0xfffffffc),
> but the code in main subtracts this value from %gs:0 rather than adds to it.
> 
> Apparently H.J. was trying to fix this two months ago, but the fix was both
> insufficient and flawed.

I can't duplicate the failure with the testcase above.

H.J.