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RE: [PATCH] linuxthreads/sysdeps/i386/useldt.h

From: Roland McGrath
Subject: RE: [PATCH] linuxthreads/sysdeps/i386/useldt.h
Date: Sat, 24 Feb 2001 18:23:43 -0500 (EST)

What is wrong with using:

extern struct _pthread_descr_struct _mydata_ __asm__("%gs:0");
#define THREAD_GETMEM(d, mem) (_mydata.mem)

I don't know if this hack works for every asm syntax, but it does for the
linux/x86 gas syntax and with what GCC generates for simple global variable
accesses.  I imagine it will produce invalid asm syntax for something like
taking the address of _mydata.foo, but if the only uses of this magic
declaration are in THREAD_GETMEM/THREAD_SETMEM, and perhaps adding a
volatile to the decl, then it should be fine.

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