source: src/libcfa/concurrency/invoke.c @ 39fea2f

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerresolv-newwith_gc
Last change on this file since 39fea2f was 39fea2f, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Implemented proper support for full-coroutines. Stack unwinding still not done.

  • Property mode set to 100644
File size: 5.7 KB
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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_coroutine(void);
31extern void __leave_thread_monitor( struct thread_desc * this );
32extern void disable_interrupts();
33extern void enable_interrupts( DEBUG_CTX_PARAM );
34
35void CtxInvokeCoroutine(
36      void (*main)(void *),
37      struct coroutine_desc *(*get_coroutine)(void *),
38      void *this
39) {
40      // LIB_DEBUG_PRINTF("Invoke Coroutine : Received %p (main %p, get_c %p)\n", this, main, get_coroutine);
41
42      struct coroutine_desc* cor = get_coroutine( this );
43
44      if(cor->state == Primed) {
45            __suspend_internal();
46      }
47
48      cor->state = Active;
49
50      main( this );
51
52      cor->state = Halted;
53
54      //Final suspend, should never return
55      __leave_coroutine();
56      abortf("Resumed dead coroutine");
57}
58
59void CtxInvokeThread(
60      void (*dtor)(void *),
61      void (*main)(void *),
62      struct thread_desc *(*get_thread)(void *),
63      void *this
64) {
65      // First suspend, once the thread arrives here,
66      // the function pointer to main can be invalidated without risk
67      __suspend_internal();
68
69      // Fetch the thread handle from the user defined thread structure
70      struct thread_desc* thrd = get_thread( this );
71
72      // Officially start the thread by enabling preemption
73      enable_interrupts( DEBUG_CTX );
74
75      // Call the main of the thread
76      main( this );
77
78      // To exit a thread we must :
79      // 1 - Mark it as halted
80      // 2 - Leave its monitor
81      // 3 - Disable the interupts
82      // 4 - Final suspend
83      // The order of these 4 operations is very important
84      //Final suspend, should never return
85      __leave_thread_monitor( thrd );
86      abortf("Resumed dead thread");
87}
88
89
90void CtxStart(
91      void (*main)(void *),
92      struct coroutine_desc *(*get_coroutine)(void *),
93      void *this,
94      void (*invoke)(void *)
95) {
96      // LIB_DEBUG_PRINTF("StartCoroutine : Passing in %p (main %p) to invoke (%p) from start (%p)\n", this, main, invoke, CtxStart);
97
98      struct coStack_t* stack = &get_coroutine( this )->stack;
99
100#if defined( __i386__ )
101
102        struct FakeStack {
103            void *fixedRegisters[3];                    // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
104            uint32_t mxcr;                        // SSE Status and Control bits (control bits are preserved across function calls)
105          uint16_t fcw;                         // X97 FPU control word (preserved across function calls)
106            void *rturn;                          // where to go on return from uSwitch
107            void *dummyReturn;                          // fake return compiler would have pushed on call to uInvoke
108            void *argument[3];                          // for 16-byte ABI, 16-byte alignment starts here
109            void *padding;                              // padding to force 16-byte alignment, as "base" is 16-byte aligned
110        };
111
112        ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack );
113        ((struct machine_context_t *)stack->context)->FP = NULL;                // terminate stack with NULL fp
114
115        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL;
116        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->argument[0] = this;     // argument to invoke
117        ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = invoke;
118      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520
119      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F;  //Vol. 1 8-7
120
121#elif defined( __x86_64__ )
122
123      struct FakeStack {
124            void *fixedRegisters[5];            // fixed registers rbx, r12, r13, r14, r15
125            uint32_t mxcr;                      // SSE Status and Control bits (control bits are preserved across function calls)
126            uint16_t fcw;                       // X97 FPU control word (preserved across function calls)
127            void *rturn;                        // where to go on return from uSwitch
128            void *dummyReturn;                  // NULL return address to provide proper alignment
129      };
130
131      ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack );
132      ((struct machine_context_t *)stack->context)->FP = NULL;          // terminate stack with NULL fp
133
134      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL;
135      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = CtxInvokeStub;
136      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[0] = this;
137      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[1] = invoke;
138      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->mxcr = 0x1F80; //Vol. 2A 3-520
139      ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fcw = 0x037F;  //Vol. 1 8-7
140#else
141      #error Only __i386__ and __x86_64__ is supported for threads in cfa
142#endif
143}
144
145// Local Variables: //
146// mode: c //
147// tab-width: 4 //
148// End: //
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