source: src/libcfa/concurrency/CtxSwitch-x86_64.S @ 8def349

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc
Last change on this file since 8def349 was eb2e723, checked in by Thierry Delisle <tdelisle@…>, 7 years ago

First prototype of kernel with proper startup and shutdown, not yet implemented for i386

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File size: 2.3 KB
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1//                               -*- Mode: Asm -*-
2//
3// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
4//
5// The contents of this file are covered under the licence agreement in the
6// file "LICENCE" distributed with Cforall.
7//
8// CtxSwitch-x86_64.S --
9//
10// Author           : Thierry Delisle
11// Created On       : Mon Nov 28 12:27:26 2016
12// Last Modified By : Thierry Delisle
13// Last Modified On : Mon Nov 28 12:27:26 2016
14// Update Count     : 0
15//
16// This  library is free  software; you  can redistribute  it and/or  modify it
17// under the terms of the GNU Lesser General Public License as published by the
18// Free Software  Foundation; either  version 2.1 of  the License, or  (at your
19// option) any later version.
20//
21// This library is distributed in the  hope that it will be useful, but WITHOUT
22// ANY  WARRANTY;  without even  the  implied  warranty  of MERCHANTABILITY  or
23// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
24// for more details.
25//
26// You should  have received a  copy of the  GNU Lesser General  Public License
27// along  with this library.
28//
29
30// This context switch routine depends on the fact that the stack of a new
31// thread has been set up to look like the thread has saved its context in
32// the normal manner.
33//
34// void CtxSwitch( machine_context *from, machine_context *to );
35
36// Offsets in the context structure. This needs to be synchronized with the
37// high level code a little better.
38
39#define PTR_BYTE        8
40#define SP_OFFSET       ( 0 * PTR_BYTE )
41#define FP_OFFSET       ( 1 * PTR_BYTE )
42#define PC_OFFSET       ( 2 * PTR_BYTE )
43
44.text
45        .align 2
46.globl  CtxSwitch
47CtxSwitch:
48
49        // Save volatile registers on the stack.
50
51        pushq %r15
52        pushq %r14
53        pushq %r13
54        pushq %r12
55        pushq %rbx
56
57        // Save old context in the "from" area.
58
59        movq %rsp,SP_OFFSET(%rdi)
60        movq %rbp,FP_OFFSET(%rdi)
61
62        // Load new context from the "to" area.
63
64        movq SP_OFFSET(%rsi),%rsp
65        movq FP_OFFSET(%rsi),%rbp
66
67        // Load volatile registers from the stack.
68
69        popq %rbx
70        popq %r12
71        popq %r13
72        popq %r14
73        popq %r15
74
75        // Return to thread.
76
77        ret
78
79.text
80        .align 2
81.globl  CtxInvokeStub
82CtxInvokeStub:
83        movq %rbx, %rdi
84        jmp *%r12
85
86.text
87        .align 2
88.globl  CtxGet
89CtxGet:
90        movq %rsp,SP_OFFSET(%rdi)
91        movq %rbp,FP_OFFSET(%rdi)
92
93        ret
94
95// Local Variables: //
96// mode: c //
97// tab-width: 4 //
98// End: //
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