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Fix NULL ucontext->uc_link handling on sparc64.

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* sysdeps/unix/sysv/linux/sparc/sparc64/__start_context.S: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/makecontext.c
	(__start_context): Declare.
	(__makecontext_ret): Delete.
	(__makecontext): Hook up __start_context instead of
	__makecontext_ret.
	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
	(sysdep_routines): Add __start_context when in stdlib.
This commit is contained in:
David S. Miller 2012-11-07 21:00:09 -08:00
parent 0fbb0fbc2e
commit 60e8270d6c
4 changed files with 54 additions and 12 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2012-11-07 David S. Miller <davem@davemloft.net>
* sysdeps/unix/sysv/linux/sparc/sparc64/__start_context.S: New file.
* sysdeps/unix/sysv/linux/sparc/sparc64/makecontext.c
(__start_context): Declare.
(__makecontext_ret): Delete.
(__makecontext): Hook up __start_context instead of
__makecontext_ret.
* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
(sysdep_routines): Add __start_context when in stdlib.
2012-11-07 Joseph Myers <joseph@codesourcery.com>
* sysdeps/x86/Makefile ($(objpfx)tst-xmmymm.out): Pass $(NM),

4
sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
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@ -3,3 +3,7 @@ default-abi := 64
sysdep-CFLAGS += -fcall-used-g6
LD += -melf64_sparc
ifeq ($(subdir),stdlib)
sysdep_routines += __start_context
endif

36
sysdeps/unix/sysv/linux/sparc/sparc64/__start_context.S Normal file
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@ -0,0 +1,36 @@
/* Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
.text
/* This is the helper code which gets called if a function which is
registered with 'makecontext' returns. In this case we have to
install the context listed in the uc_link element of the context
'makecontext' manipulated at the time of the 'makecontext' call.
If the pointer is NULL the process must terminate. */
ENTRY(__start_context)
brz,pn %i0, 1f
mov 1, %o1
call __setcontext
mov %i0, %o0
1: call HIDDEN_JUMPTARGET(exit)
mov 0, %o0
unimp 0
END(__start_context)

15
sysdeps/unix/sysv/linux/sparc/sparc64/makecontext.c
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@ -21,6 +21,8 @@
#include <stdlib.h>
#include <ucontext.h>
extern void __start_context (struct ucontext *ucp);
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
{
@ -37,7 +39,7 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
ucp->uc_mcontext.mc_gregs[MC_PC] = (long) func;
ucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) func) + 4;
ucp->uc_mcontext.mc_gregs[MC_O6] = ((long) sp) - 0x7ff;
ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __makecontext_ret) - 8;
ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __start_context) - 8;
ucp->uc_mcontext.mc_fp = ((long) topsp) - 0x7ff;
ucp->uc_mcontext.mc_i7 = 0;
topsp[14] = 0;
@ -52,15 +54,4 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
va_end (ap);
}
asm (" \n\
.text \n\
.type __makecontext_ret, #function \n\
__makecontext_ret: \n\
mov 1, %o1 \n\
call __setcontext \n\
mov %i0, %o0 \n\
unimp 0 \n\
.size __makecontext_ret, .-__makecontext_ret \n\
");
weak_alias (__makecontext, makecontext)