source: libcfa/src/concurrency/CtxSwitch-x86_64.S @ bf71cfd

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprno_listpersistent-indexer
Last change on this file since bf71cfd was bf71cfd, checked in by Thierry Delisle <tdelisle@…>, 3 years ago

Moved up many directories in source

  • Property mode set to 100644
File size: 2.4 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// CtxSwitch-x86_64.S --
8//
9// Author           : Thierry Delisle
10// Created On       : Mon Nov 28 12:27:26 2016
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Jul 21 22:28:11 2017
13// Update Count     : 1
14//
15// This  library is free  software; you  can redistribute  it and/or  modify it
16// under the terms of the GNU Lesser General Public License as published by the
17// Free Software  Foundation; either  version 2.1 of  the License, or  (at your
18// option) any later version.
19//
20// This library is distributed in the  hope that it will be useful, but WITHOUT
21// ANY  WARRANTY;  without even  the  implied  warranty  of MERCHANTABILITY  or
22// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
23// for more details.
24//
25// You should  have received a  copy of the  GNU Lesser General  Public License
26// along  with this library.
27//
28
29// This context switch routine depends on the fact that the stack of a new
30// thread has been set up to look like the thread has saved its context in
31// the normal manner.
32//
33// void CtxSwitch( machine_context *from, machine_context *to );
34
35// Offsets in the context structure. This needs to be synchronized with the
36// high level code a little better.
37
38#define PTR_BYTE        8
39#define SP_OFFSET       ( 0 * PTR_BYTE )
40#define FP_OFFSET       ( 1 * PTR_BYTE )
41#define PC_OFFSET       ( 2 * PTR_BYTE )
42
43.text
44        .align 2
45.globl  CtxSwitch
46CtxSwitch:
47
48        // Save floating & SSE control words on the stack.
49
50        subq   $8,%rsp
51        stmxcsr 0(%rsp)         // 4 bytes
52        fnstcw  4(%rsp)         // 2 bytes
53
54        // Save volatile registers on the stack.
55
56        pushq %r15
57        pushq %r14
58        pushq %r13
59        pushq %r12
60        pushq %rbx
61
62        // Save old context in the "from" area.
63
64        movq %rsp,SP_OFFSET(%rdi)
65        movq %rbp,FP_OFFSET(%rdi)
66
67        // Load new context from the "to" area.
68
69        movq SP_OFFSET(%rsi),%rsp
70        movq FP_OFFSET(%rsi),%rbp
71
72        // Load volatile registers from the stack.
73
74        popq %rbx
75        popq %r12
76        popq %r13
77        popq %r14
78        popq %r15
79
80        // Load floating & SSE control words from the stack.
81
82        fldcw   4(%rsp)
83        ldmxcsr 0(%rsp)
84        addq   $8,%rsp
85
86        // Return to thread.
87
88        ret
89
90.text
91        .align 2
92.globl  CtxInvokeStub
93CtxInvokeStub:
94        movq %rbx, %rdi
95        jmp *%r12
96
97// Local Variables: //
98// mode: c //
99// tab-width: 4 //
100// End: //
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