source: src/libcfa/concurrency/invoke.c @ 6b0b624

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerresolv-newwith_gc
Last change on this file since 6b0b624 was 6b0b624, checked in by Peter A. Buhr <pabuhr@…>, 4 years ago

change #ifndef to #pragma once

  • Property mode set to 100644
File size: 5.6 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// invoke.c --
8//
9// Author           : Thierry Delisle
10// Created On       : Tue Jan 17 12:27:26 2016
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Jul 21 22:28:33 2017
13// Update Count     : 1
14//
15
16#include <stdbool.h>
17#include <stdlib.h>
18#include <stdio.h>
19
20#include "libhdr.h"
21#include "invoke.h"
22
23#define __CFA_INVOKE_PRIVATE__
24#include "invoke.h"
25
26// magically invoke the "main" of the most derived class
27// Called from the kernel when starting a coroutine or task so must switch back to user mode.
28
29extern void __suspend_internal(void);
30extern void __leave_thread_monitor( struct thread_desc * this );
31extern void disable_interrupts();
32extern void enable_interrupts( DEBUG_CTX_PARAM );
33
34void CtxInvokeCoroutine(
35      void (*main)(void *),
36      struct coroutine_desc *(*get_coroutine)(void *),
37      void *this
38) {
39      // LIB_DEBUG_PRINTF("Invoke Coroutine : Received %p (main %p, get_c %p)\n", this, main, get_coroutine);
40
41      struct coroutine_desc* cor = get_coroutine( this );
42
43      if(cor->state == Primed) {
44            __suspend_internal();
45      }
46
47      cor->state = Active;
48
49      main( this );
50
51      cor->state = Halted;
52
53      //Final suspend, should never return
54      __suspend_internal();
55      abortf("Resumed dead coroutine");
56}
57
58void CtxInvokeThread(
59      void (*dtor)(void *),
60      void (*main)(void *),
61      struct thread_desc *(*get_thread)(void *),
62      void *this
63) {
64      // First suspend, once the thread arrives here,
65      // the function pointer to main can be invalidated without risk
66      __suspend_internal();
67
68      // Fetch the thread handle from the user defined thread structure
69      struct thread_desc* thrd = get_thread( this );
70
71      // Officially start the thread by enabling preemption
72      enable_interrupts( DEBUG_CTX );
73
74      // Call the main of the thread
75      main( this );
76
77      // To exit a thread we must :
78      // 1 - Mark it as halted
79      // 2 - Leave its monitor
80      // 3 - Disable the interupts
81      // 4 - Final suspend
82      // The order of these 4 operations is very important
83      //Final suspend, should never return
84      __leave_thread_monitor( thrd );
85      abortf("Resumed dead thread");
86}
87
88
89void CtxStart(
90      void (*main)(void *),
91      struct coroutine_desc *(*get_coroutine)(void *),
92      void *this,
93      void (*invoke)(void *)
94) {
95      // LIB_DEBUG_PRINTF("StartCoroutine : Passing in %p (main %p) to invoke (%p) from start (%p)\n", this, main, invoke, CtxStart);
96
97      struct coStack_t* stack = &get_coroutine( this )->stack;
98
99#if defined( __i386__ )
100
101        struct FakeStack {
102            void *fixedRegisters[3];                    // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
103            uint32_t mxcr;                        // SSE Status and Control bits (control bits are preserved across function calls)
104          uint16_t fcw;                         // X97 FPU control word (preserved across function calls)
105            void *rturn;                          // where to go on return from uSwitch
106            void *dummyReturn;                          // fake return compiler would have pushed on call to uInvoke
107            void *argument[3];                          // for 16-byte ABI, 16-byte alignment starts here
108            void *padding;                              // padding to force 16-byte alignment, as "base" is 16-byte aligned
109        };
110
111        ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack );
112        ((struct machine_context_t *)stack->context)->FP = NULL;                // terminate stack with NULL fp
113
114        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL;
115        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->argument[0] = this;     // argument to invoke
116        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = invoke;
117      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520
118      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F;  //Vol. 1 8-7
119
120#elif defined( __x86_64__ )
121
122      struct FakeStack {
123            void *fixedRegisters[5];            // fixed registers rbx, r12, r13, r14, r15
124            uint32_t mxcr;                      // SSE Status and Control bits (control bits are preserved across function calls)
125            uint16_t fcw;                       // X97 FPU control word (preserved across function calls)
126            void *rturn;                        // where to go on return from uSwitch
127            void *dummyReturn;                  // NULL return address to provide proper alignment
128      };
129
130      ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack );
131      ((struct machine_context_t *)stack->context)->FP = NULL;          // terminate stack with NULL fp
132
133      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL;
134      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = CtxInvokeStub;
135      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[0] = this;
136      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[1] = invoke;
137      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520
138      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F;  //Vol. 1 8-7
139#else
140      #error Only __i386__ and __x86_64__ is supported for threads in cfa
141#endif
142}
143
144// Local Variables: //
145// mode: c //
146// tab-width: 4 //
147// End: //
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