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Do not clobber sp in _hurd_stack_setup.

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GCC mainline now gives errors for an asm that clobbers the stack
pointer.  According to
<https://gcc.gnu.org/ml/gcc-patches/2018-12/msg00932.html> GCC
previously ignored such a clobber; thus, this patch removes it from
_hurd_stack_setup.

Tested with build-many-glibcs.py for i686-gnu.

	* sysdeps/mach/hurd/i386/init-first.c (_hurd_stack_setup): Do not
	clobber sp.
This commit is contained in:
Joseph Myers 2018-12-13 22:36:33 +00:00
parent ade8b817fe
commit db6df070cf
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-12-13 Joseph Myers <joseph@codesourcery.com>
* sysdeps/mach/hurd/i386/init-first.c (_hurd_stack_setup): Do not
clobber sp.
2018-12-13 fanjinke <fanjinke@hygon.cn>
* sysdeps/x86/cpu-features.c (init_cpu_features): Check for

2
sysdeps/mach/hurd/i386/init-first.c
View File

@ -361,7 +361,7 @@ _hurd_stack_setup (void)
*--data = caller;
asm volatile ("movl %0, %%esp\n" /* Switch to new outermost stack. */
"movl $0, %%ebp\n" /* Clear outermost frame pointer. */
"jmp *%1" : : "r" (data), "r" (&doinit1) : "sp");
"jmp *%1" : : "r" (data), "r" (&doinit1));
/* NOTREACHED */
}