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Diffstat (limited to 'libc/sysdeps/linux/sparc/getcontext.S')
-rw-r--r--libc/sysdeps/linux/sparc/getcontext.S84
1 files changed, 84 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/getcontext.S b/libc/sysdeps/linux/sparc/getcontext.S
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+++ b/libc/sysdeps/linux/sparc/getcontext.S
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+/* Save current context.
+ Copyright (C) 2008-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by David S. Miller <davem@davemloft.net>, 2008.
+
+ 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>
+
+#include "ucontext_i.h"
+
+/* int __getcontext (ucontext_t *ucp)
+
+ Saves the machine context in UCP such that when it is activated,
+ it appears as if __getcontext() returned again.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to save anything
+ other than the PRESERVED state. */
+
+
+ENTRY(__getcontext)
+ save %sp, -112, %sp
+ st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]
+
+ /* In reality, we only use the GREG_PC value when setting
+ or swapping contexts. But we fill in NPC for completeness. */
+ add %i7, 8, %o0
+ st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC]
+ add %o0, 4, %o0
+ st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC]
+
+ rd %y, %o1
+ st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y]
+
+ st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1]
+ st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2]
+ st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3]
+ st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4]
+ st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5]
+ st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6]
+ st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7]
+
+ mov SIG_BLOCK, %o0
+ clr %o1
+ add %i0, UC_SIGMASK, %o2
+ mov 8, %o3
+ mov __NR_rt_sigprocmask, %g1
+ ta 0x10
+
+ /* Zero, success, return value. */
+ st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0]
+ st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1]
+ st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2]
+ st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3]
+ st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4]
+ st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5]
+ st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6]
+ st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7]
+
+ st %g0, [%i0 + UC_MCONTEXT + MC_GWINS]
+
+ /* Do not save FPU state, it is volatile across calls. */
+ stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN]
+
+ st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID]
+ st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR]
+ jmpl %i7 + 8, %g0
+ restore %g0, %g0, %o0
+END(__getcontext)
+
+weak_alias (__getcontext, getcontext)