Ignore:
Timestamp:
Dec 2, 2016, 5:10:22 PM (5 years ago)
Author:
Thierry Delisle <tdelisle@…>
Branches:
aaron-thesis, arm-eh, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, resolv-new, with_gc
Children:
d7bcbf5
Parents:
4cb935e
Message:

Ugly but working coroutines

File:
1 edited

Legend:

Unmodified
Added
Removed
  • src/libcfa/concurrency/CtxSwitch-x86_64.S

    r4cb935e r78b3f52  
     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  coInvokeStub
     82coInvokeStub:
     83        movq %rbx, %rdi
     84        movq %r12, %rsi
     85        jmp *%r13
     86
     87// Local Variables: //
     88// mode: c //
     89// tab-width: 4 //
     90// End: //
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