[0157ca7] | 1 | // -*- Mode: C -*- |
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[8def349] | 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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| 8 | // invoke.c -- |
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| 9 | // |
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| 10 | // Author : Thierry Delisle |
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| 11 | // Created On : Tue Jan 17 12:27:26 2016 |
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| 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : -- |
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| 14 | // Update Count : 0 |
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| 15 | // |
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[78b3f52] | 16 | |
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| 17 | #include <stdbool.h> |
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| 18 | #include <stdlib.h> |
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| 19 | #include <stdio.h> |
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| 20 | |
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[d9c44c3] | 21 | #include "libhdr.h" |
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[78b3f52] | 22 | #include "invoke.h" |
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| 23 | |
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[5c81105] | 24 | #define __CFA_INVOKE_PRIVATE__ |
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| 25 | #include "invoke.h" |
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[78b3f52] | 26 | |
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| 27 | // magically invoke the "main" of the most derived class |
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| 28 | // Called from the kernel when starting a coroutine or task so must switch back to user mode. |
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[5c81105] | 29 | |
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[0c92c9f] | 30 | extern void __suspend_internal(void); |
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[1c273d0] | 31 | extern void __leave_thread_monitor( struct thread_desc * this ); |
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[82ff5845] | 32 | extern void disable_interrupts(); |
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[2ac095d] | 33 | extern void enable_interrupts( DEBUG_CTX_PARAM ); |
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[78b3f52] | 34 | |
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[b58a5772] | 35 | void CtxInvokeCoroutine( |
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[1c273d0] | 36 | void (*main)(void *), |
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| 37 | struct coroutine_desc *(*get_coroutine)(void *), |
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[80d9e49] | 38 | void *this |
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| 39 | ) { |
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[c84e80a] | 40 | // LIB_DEBUG_PRINTF("Invoke Coroutine : Received %p (main %p, get_c %p)\n", this, main, get_coroutine); |
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[80d9e49] | 41 | |
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[c3acb841] | 42 | struct coroutine_desc* cor = get_coroutine( this ); |
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[80d9e49] | 43 | |
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| 44 | if(cor->state == Primed) { |
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[0c92c9f] | 45 | __suspend_internal(); |
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[80d9e49] | 46 | } |
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[78b3f52] | 47 | |
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| 48 | cor->state = Active; |
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| 49 | |
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[80d9e49] | 50 | main( this ); |
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[8118303] | 51 | |
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[ee897e4b] | 52 | cor->state = Halted; |
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[8f49a54] | 53 | |
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[8118303] | 54 | //Final suspend, should never return |
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[0c92c9f] | 55 | __suspend_internal(); |
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| 56 | abortf("Resumed dead coroutine"); |
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[8118303] | 57 | } |
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| 58 | |
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| 59 | void CtxInvokeThread( |
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[1c273d0] | 60 | void (*dtor)(void *), |
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| 61 | void (*main)(void *), |
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| 62 | struct thread_desc *(*get_thread)(void *), |
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[8118303] | 63 | void *this |
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| 64 | ) { |
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[1c273d0] | 65 | // First suspend, once the thread arrives here, |
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| 66 | // the function pointer to main can be invalidated without risk |
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[0c92c9f] | 67 | __suspend_internal(); |
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[8118303] | 68 | |
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[1c273d0] | 69 | // Fetch the thread handle from the user defined thread structure |
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[348006f] | 70 | struct thread_desc* thrd = get_thread( this ); |
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[1c273d0] | 71 | |
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| 72 | // Officially start the thread by enabling preemption |
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[2ac095d] | 73 | enable_interrupts( DEBUG_CTX ); |
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[8118303] | 74 | |
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[1c273d0] | 75 | // Call the main of the thread |
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[8118303] | 76 | main( this ); |
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| 77 | |
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[1c273d0] | 78 | // To exit a thread we must : |
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| 79 | // 1 - Mark it as halted |
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| 80 | // 2 - Leave its monitor |
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| 81 | // 3 - Disable the interupts |
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| 82 | // The order of these 3 operations is very important |
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| 83 | __leave_thread_monitor( thrd ); |
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[c84e80a] | 84 | |
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[8118303] | 85 | //Final suspend, should never return |
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[0c92c9f] | 86 | __suspend_internal(); |
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| 87 | abortf("Resumed dead thread"); |
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[78b3f52] | 88 | } |
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| 89 | |
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[5c81105] | 90 | |
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[b58a5772] | 91 | void CtxStart( |
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[1c273d0] | 92 | void (*main)(void *), |
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| 93 | struct coroutine_desc *(*get_coroutine)(void *), |
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| 94 | void *this, |
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[80d9e49] | 95 | void (*invoke)(void *) |
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| 96 | ) { |
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[c84e80a] | 97 | // LIB_DEBUG_PRINTF("StartCoroutine : Passing in %p (main %p) to invoke (%p) from start (%p)\n", this, main, invoke, CtxStart); |
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[5c81105] | 98 | |
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[80d9e49] | 99 | struct coStack_t* stack = &get_coroutine( this )->stack; |
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[78b3f52] | 100 | |
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[d9c44c3] | 101 | #if defined( __i386__ ) |
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| 102 | |
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| 103 | struct FakeStack { |
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| 104 | void *fixedRegisters[3]; // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant) |
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[17af7d1] | 105 | uint32_t mxcr; // SSE Status and Control bits (control bits are preserved across function calls) |
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| 106 | uint16_t fcw; // X97 FPU control word (preserved across function calls) |
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| 107 | void *rturn; // where to go on return from uSwitch |
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[d9c44c3] | 108 | void *dummyReturn; // fake return compiler would have pushed on call to uInvoke |
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[80d9e49] | 109 | void *argument[3]; // for 16-byte ABI, 16-byte alignment starts here |
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| 110 | void *padding; // padding to force 16-byte alignment, as "base" is 16-byte aligned |
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[d9c44c3] | 111 | }; |
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| 112 | |
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| 113 | ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack ); |
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| 114 | ((struct machine_context_t *)stack->context)->FP = NULL; // terminate stack with NULL fp |
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| 115 | |
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| 116 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL; |
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[80d9e49] | 117 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->argument[0] = this; // argument to invoke |
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[d9c44c3] | 118 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = invoke; |
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[17af7d1] | 119 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520 |
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[1c273d0] | 120 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F; //Vol. 1 8-7 |
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[d9c44c3] | 121 | |
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| 122 | #elif defined( __x86_64__ ) |
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| 123 | |
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[78b3f52] | 124 | struct FakeStack { |
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[17af7d1] | 125 | void *fixedRegisters[5]; // fixed registers rbx, r12, r13, r14, r15 |
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| 126 | uint32_t mxcr; // SSE Status and Control bits (control bits are preserved across function calls) |
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| 127 | uint16_t fcw; // X97 FPU control word (preserved across function calls) |
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| 128 | void *rturn; // where to go on return from uSwitch |
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| 129 | void *dummyReturn; // NULL return address to provide proper alignment |
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[d9c44c3] | 130 | }; |
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[78b3f52] | 131 | |
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| 132 | ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack ); |
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| 133 | ((struct machine_context_t *)stack->context)->FP = NULL; // terminate stack with NULL fp |
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| 134 | |
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| 135 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL; |
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[b58a5772] | 136 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = CtxInvokeStub; |
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[80d9e49] | 137 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[0] = this; |
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[5c81105] | 138 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[1] = invoke; |
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[8761006c] | 139 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520 |
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[1c273d0] | 140 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F; //Vol. 1 8-7 |
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[d9c44c3] | 141 | #else |
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| 142 | #error Only __i386__ and __x86_64__ is supported for threads in cfa |
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| 143 | #endif |
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[e4745d7a] | 144 | } |
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