[8def349] | 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 | // invoke.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Tue Jan 17 12:27:26 2016 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[bede27b] | 12 | // Last Modified On : Fri Feb 9 16:37:42 2018 |
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| 13 | // Update Count : 5 |
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[8def349] | 14 | // |
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[78b3f52] | 15 | |
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| 16 | #include <stdbool.h> |
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| 17 | #include <stdlib.h> |
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| 18 | #include <stdio.h> |
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[76e069f] | 19 | #include <unwind.h> |
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[78b3f52] | 20 | |
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| 21 | #include "invoke.h" |
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| 22 | |
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[5c81105] | 23 | #define __CFA_INVOKE_PRIVATE__ |
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| 24 | #include "invoke.h" |
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[78b3f52] | 25 | |
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| 26 | // magically invoke the "main" of the most derived class |
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| 27 | // Called from the kernel when starting a coroutine or task so must switch back to user mode. |
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[5c81105] | 28 | |
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[0c92c9f] | 29 | extern void __suspend_internal(void); |
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[212c2187] | 30 | extern void __leave_coroutine( struct coroutine_desc * ); |
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[e8e457e] | 31 | extern void __finish_creation( struct thread_desc * ); |
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[1c273d0] | 32 | extern void __leave_thread_monitor( struct thread_desc * this ); |
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[82ff5845] | 33 | extern void disable_interrupts(); |
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[36982fc] | 34 | extern void enable_interrupts( __cfaabi_dbg_ctx_param ); |
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[78b3f52] | 35 | |
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[b58a5772] | 36 | void CtxInvokeCoroutine( |
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[36982fc] | 37 | void (*main)(void *), |
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| 38 | struct coroutine_desc *(*get_coroutine)(void *), |
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| 39 | void *this |
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[80d9e49] | 40 | ) { |
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[36982fc] | 41 | struct coroutine_desc* cor = get_coroutine( this ); |
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[80d9e49] | 42 | |
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[36982fc] | 43 | if(cor->state == Primed) { |
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| 44 | __suspend_internal(); |
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| 45 | } |
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[80d9e49] | 46 | |
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[36982fc] | 47 | cor->state = Active; |
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[78b3f52] | 48 | |
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[36982fc] | 49 | main( this ); |
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[78b3f52] | 50 | |
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[36982fc] | 51 | //Final suspend, should never return |
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[212c2187] | 52 | __leave_coroutine( cor ); |
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[169d944] | 53 | __cabi_abort( "Resumed dead coroutine" ); |
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[8118303] | 54 | } |
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| 55 | |
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[76e069f] | 56 | static _Unwind_Reason_Code _CtxCoroutine_UnwindStop( |
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| 57 | __attribute((__unused__)) int version, |
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| 58 | _Unwind_Action actions, |
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| 59 | __attribute((__unused__)) _Unwind_Exception_Class exceptionClass, |
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| 60 | __attribute((__unused__)) struct _Unwind_Exception * unwind_exception, |
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| 61 | __attribute((__unused__)) struct _Unwind_Context * context, |
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[212c2187] | 62 | void * param |
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[76e069f] | 63 | ) { |
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| 64 | if( actions & _UA_END_OF_STACK ) { |
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| 65 | // We finished unwinding the coroutine, |
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| 66 | // leave it |
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[212c2187] | 67 | __leave_coroutine( param ); |
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[76e069f] | 68 | __cabi_abort( "Resumed dead coroutine" ); |
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| 69 | } |
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| 70 | if( actions & _UA_CLEANUP_PHASE ) return _URC_NO_REASON; |
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| 71 | |
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| 72 | return _URC_FATAL_PHASE2_ERROR; |
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| 73 | } |
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| 74 | |
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[212c2187] | 75 | void _CtxCoroutine_Unwind(struct _Unwind_Exception * storage, struct coroutine_desc * cor) __attribute__ ((__noreturn__)); |
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| 76 | void _CtxCoroutine_Unwind(struct _Unwind_Exception * storage, struct coroutine_desc * cor) { |
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| 77 | _Unwind_Reason_Code ret = _Unwind_ForcedUnwind( storage, _CtxCoroutine_UnwindStop, cor ); |
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[76e069f] | 78 | printf("UNWIND ERROR %d after force unwind\n", ret); |
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| 79 | abort(); |
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| 80 | } |
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| 81 | |
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[8118303] | 82 | void CtxInvokeThread( |
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[36982fc] | 83 | void (*dtor)(void *), |
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| 84 | void (*main)(void *), |
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| 85 | struct thread_desc *(*get_thread)(void *), |
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| 86 | void *this |
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[8118303] | 87 | ) { |
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[212c2187] | 88 | // Fetch the thread handle from the user defined thread structure |
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| 89 | struct thread_desc* thrd = get_thread( this ); |
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| 90 | |
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[36982fc] | 91 | // First suspend, once the thread arrives here, |
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| 92 | // the function pointer to main can be invalidated without risk |
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[e8e457e] | 93 | __finish_creation( thrd ); |
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[36982fc] | 94 | |
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| 95 | // Officially start the thread by enabling preemption |
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| 96 | enable_interrupts( __cfaabi_dbg_ctx ); |
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| 97 | |
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| 98 | // Call the main of the thread |
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| 99 | main( this ); |
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| 100 | |
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| 101 | // To exit a thread we must : |
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| 102 | // 1 - Mark it as halted |
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| 103 | // 2 - Leave its monitor |
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| 104 | // 3 - Disable the interupts |
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| 105 | // 4 - Final suspend |
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| 106 | // The order of these 4 operations is very important |
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| 107 | //Final suspend, should never return |
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| 108 | __leave_thread_monitor( thrd ); |
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[169d944] | 109 | __cabi_abort( "Resumed dead thread" ); |
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[78b3f52] | 110 | } |
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| 111 | |
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[5c81105] | 112 | |
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[b58a5772] | 113 | void CtxStart( |
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[36982fc] | 114 | void (*main)(void *), |
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| 115 | struct coroutine_desc *(*get_coroutine)(void *), |
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| 116 | void *this, |
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| 117 | void (*invoke)(void *) |
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[80d9e49] | 118 | ) { |
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[b2f6113] | 119 | struct coroutine_desc * cor = get_coroutine( this ); |
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| 120 | struct __stack_t * stack = cor->stack.storage; |
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[78b3f52] | 121 | |
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[381fdee] | 122 | #if defined( __i386 ) |
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[d9c44c3] | 123 | |
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| 124 | struct FakeStack { |
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| 125 | void *fixedRegisters[3]; // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant) |
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[17af7d1] | 126 | void *rturn; // where to go on return from uSwitch |
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[d9c44c3] | 127 | void *dummyReturn; // fake return compiler would have pushed on call to uInvoke |
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[80d9e49] | 128 | void *argument[3]; // for 16-byte ABI, 16-byte alignment starts here |
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| 129 | void *padding; // padding to force 16-byte alignment, as "base" is 16-byte aligned |
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[d9c44c3] | 130 | }; |
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| 131 | |
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[b2f6113] | 132 | cor->context.SP = (char *)stack->base - sizeof( struct FakeStack ); |
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| 133 | cor->context.FP = NULL; // terminate stack with NULL fp |
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[d9c44c3] | 134 | |
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[b2f6113] | 135 | struct FakeStack *fs = (struct FakeStack *)cor->context.SP; |
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| 136 | |
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| 137 | fs->dummyReturn = NULL; |
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| 138 | fs->argument[0] = this; // argument to invoke |
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| 139 | fs->rturn = invoke; |
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[d9c44c3] | 140 | |
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[381fdee] | 141 | #elif defined( __x86_64 ) |
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[d9c44c3] | 142 | |
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[36982fc] | 143 | struct FakeStack { |
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| 144 | void *fixedRegisters[5]; // fixed registers rbx, r12, r13, r14, r15 |
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| 145 | void *rturn; // where to go on return from uSwitch |
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| 146 | void *dummyReturn; // NULL return address to provide proper alignment |
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| 147 | }; |
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| 148 | |
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[b2f6113] | 149 | cor->context.SP = (char *)stack->base - sizeof( struct FakeStack ); |
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| 150 | cor->context.FP = NULL; // terminate stack with NULL fp |
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| 151 | |
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| 152 | struct FakeStack *fs = (struct FakeStack *)cor->context.SP; |
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[36982fc] | 153 | |
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[b2f6113] | 154 | fs->dummyReturn = NULL; |
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| 155 | fs->rturn = CtxInvokeStub; |
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| 156 | fs->fixedRegisters[0] = this; |
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| 157 | fs->fixedRegisters[1] = invoke; |
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[b158d8f] | 158 | |
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| 159 | #elif defined( __ARM_ARCH ) |
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| 160 | |
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| 161 | struct FakeStack { |
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| 162 | float fpRegs[16]; // floating point registers |
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| 163 | void *intRegs[9]; // integer/pointer registers |
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| 164 | void *arg[2]; // placeholder for this pointer |
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| 165 | }; |
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| 166 | |
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[b2f6113] | 167 | cor->context.SP = (char *)stack->base - sizeof( struct FakeStack ); |
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| 168 | cor->context.FP = NULL; |
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[b158d8f] | 169 | |
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[b2f6113] | 170 | struct FakeStack *fs = (struct FakeStack *)cor->context.SP; |
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[b158d8f] | 171 | |
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| 172 | fs->intRegs[8] = CtxInvokeStub; |
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| 173 | fs->arg[0] = this; |
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| 174 | fs->arg[1] = invoke; |
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[381fdee] | 175 | |
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[d9c44c3] | 176 | #else |
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[381fdee] | 177 | #error uknown hardware architecture |
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[d9c44c3] | 178 | #endif |
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[e4745d7a] | 179 | } |
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[6b0b624] | 180 | |
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| 181 | // Local Variables: // |
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| 182 | // mode: c // |
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| 183 | // tab-width: 4 // |
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| 184 | // End: // |
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