1 files changed, 74 insertions, 0 deletions
diff --git a/src/s390x/getcontext.S b/src/s390x/getcontext.S
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+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2008 Google, Inc
+	Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
+   Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
+   Copyright (C) 2017 IBM
+
+   Modified for s390x by Michael Munday <mike.munday@ibm.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+// int _Us390x_getcontext (unw_tdep_context_t *ucp)
+
+	.global _Us390x_getcontext
+	.type _Us390x_getcontext, @function
+_Us390x_getcontext:
+	.cfi_startproc
+
+	// Save the minimal set of registers required to restore the
+	// context. Generally speaking this is just the preserved
+	// registers but we've also saved the parameter registers
+	// so that return values can be modified too.
+
+	// save PSW address
+	// (not strictly needed but makes other code simpler)
+	stg   %r14,0x30(%r2)
+
+	// floating point parameters (not strictly needed)
+	std   %f0,0x100(%r2)
+	std   %f2,0x110(%r2)
+	std   %f4,0x120(%r2)
+	std   %f6,0x130(%r2)
+
+	// floating point preserved registers
+	stfpc 0xf8(%r2)
+	std   %f8,0x140(%r2)
+	std   %f9,0x148(%r2)
+	std   %f10,0x150(%r2)
+	std   %f11,0x158(%r2)
+	std   %f12,0x160(%r2)
+	std   %f13,0x168(%r2)
+	std   %f14,0x170(%r2)
+	std   %f15,0x178(%r2)
+
+	// preserved registers and parameters
+	lgr   %r1,%r2
+	lghi  %r2,0
+	stmg  %r2,%r15,0x48(%r1)
+
+	br    %r14
+
+	.cfi_endproc
+	.size _Us390x_getcontext, . - _Us390x_getcontext
+
+	// We do not need executable stack.
+	.section        .note.GNU-stack,"",@progbits