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