sparc: add deprecated context switching functions

Ported over from glibc mostly without changes.
Lightly tested with mongrel2 in qemu-system-sparc.

1 files changed, 84 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/sparc/getcontext.S b/libc/sysdeps/linux/sparc/getcontext.S
new file mode 100644
index 000000000..615a2c190
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/getcontext.S
@@ -0,0 +1,84 @@
+/* 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)