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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-04-23 12:17:56 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-04-26 19:41:08 +0200
commit2b3cdadee36b0445ed799932358dd94a1e839b46 (patch)
tree88120c5bcbf0a5420b3407bc5b0ccc1f0eae1456 /libc/sysdeps/linux/sparc/swapcontext.S
parentf1dcb9beedc5d05238e90cfbad026736d6efe891 (diff)
sparc: add deprecated context switching functions
Ported over from glibc mostly without changes. Lightly tested with mongrel2 in qemu-system-sparc.
Diffstat (limited to 'libc/sysdeps/linux/sparc/swapcontext.S')
-rw-r--r--libc/sysdeps/linux/sparc/swapcontext.S118
1 files changed, 118 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/swapcontext.S b/libc/sysdeps/linux/sparc/swapcontext.S
new file mode 100644
index 000000000..7dc7e2ebf
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/swapcontext.S
@@ -0,0 +1,118 @@
+/* Save current context and install the given one.
+ 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"
+
+#define ST_FLUSH_WINDOWS 3
+
+/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
+
+ Saves the machine context in oucp such that when it is activated,
+ it appears as if __swapcontext() returned again, restores the
+ machine context in ucp and thereby resumes execution in that
+ context.
+
+ 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(__swapcontext)
+ save %sp, -112, %sp
+ ta ST_FLUSH_WINDOWS
+ st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]
+ 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]
+ 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]
+ 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]
+
+ mov SIG_SETMASK, %o0
+ add %i1, UC_SIGMASK, %o1
+ add %i0, UC_SIGMASK, %o2
+ mov 8, %o3
+ mov __NR_rt_sigprocmask, %g1
+ ta 0x10
+
+ mov %i1, %i0
+ ldub [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN], %g1
+ cmp %g1, 0
+ be 1f
+ nop
+ ld [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_FSR], %fsr
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D0], %f0
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D2], %f2
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D4], %f4
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D6], %f6
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D8], %f8
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D10], %f10
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D12], %f12
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D14], %f14
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D16], %f16
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D18], %f18
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D20], %f20
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D22], %f22
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D24], %f24
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D26], %f26
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D28], %f28
+ ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D30], %f30
+1:
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y], %g1
+ wr %g1, 0x0, %y
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2], %g2
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3], %g3
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4], %g4
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5], %g5
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6], %g6
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7], %g7
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1], %i1
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2], %i2
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3], %i3
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4], %i4
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5], %i5
+ ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6], %i6
+ restore
+ ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O7], %o7
+ ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_PC], %g1
+ jmpl %g1, %g0
+ ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O0], %o0
+END(__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)