source: libcfa/src/concurrency/invoke.c @ 2026bb6

arm-ehjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-expr
Last change on this file since 2026bb6 was 2026bb6, checked in by Thierry Delisle <tdelisle@…>, 2 years ago

More robust fix for optionally linking threads

  • Property mode set to 100644
File size: 5.4 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 Feb  9 16:37:42 2018
13// Update Count     : 5
14//
15
16#define __cforall_thread__
17
18#include <stdbool.h>
19#include <stdlib.h>
20#include <stdio.h>
21#include <unwind.h>
22
23#include "invoke.h"
24
25#define __CFA_INVOKE_PRIVATE__
26#include "invoke.h"
27
28// magically invoke the "main" of the most derived class
29// Called from the kernel when starting a coroutine or task so must switch back to user mode.
30
31extern void __suspend_internal(void);
32extern void __leave_coroutine( struct coroutine_desc * );
33extern void __finish_creation( struct thread_desc * );
34extern void __leave_thread_monitor( struct thread_desc * this );
35extern void disable_interrupts() OPTIONAL_THREAD;
36extern void enable_interrupts( __cfaabi_dbg_ctx_param );
37
38void CtxInvokeCoroutine(
39        void (*main)(void *),
40        struct coroutine_desc *(*get_coroutine)(void *),
41        void *this
42) {
43        struct coroutine_desc* cor = get_coroutine( this );
44
45        if(cor->state == Primed) {
46                __suspend_internal();
47        }
48
49        cor->state = Active;
50
51        main( this );
52
53        //Final suspend, should never return
54        __leave_coroutine( cor );
55        __cabi_abort( "Resumed dead coroutine" );
56}
57
58static _Unwind_Reason_Code _CtxCoroutine_UnwindStop(
59        __attribute((__unused__)) int version,
60        _Unwind_Action actions,
61        __attribute((__unused__)) _Unwind_Exception_Class exceptionClass,
62        __attribute((__unused__)) struct _Unwind_Exception * unwind_exception,
63        __attribute((__unused__)) struct _Unwind_Context * context,
64        void * param
65) {
66        if( actions & _UA_END_OF_STACK  ) {
67                // We finished unwinding the coroutine,
68                // leave it
69                __leave_coroutine( param );
70                __cabi_abort( "Resumed dead coroutine" );
71        }
72        if( actions & _UA_CLEANUP_PHASE ) return _URC_NO_REASON;
73
74        return _URC_FATAL_PHASE2_ERROR;
75}
76
77void _CtxCoroutine_Unwind(struct _Unwind_Exception * storage, struct coroutine_desc * cor) __attribute__ ((__noreturn__));
78void _CtxCoroutine_Unwind(struct _Unwind_Exception * storage, struct coroutine_desc * cor) {
79        _Unwind_Reason_Code ret = _Unwind_ForcedUnwind( storage, _CtxCoroutine_UnwindStop, cor );
80        printf("UNWIND ERROR %d after force unwind\n", ret);
81        abort();
82}
83
84void CtxInvokeThread(
85        void (*dtor)(void *),
86        void (*main)(void *),
87        struct thread_desc *(*get_thread)(void *),
88        void *this
89) {
90        // Fetch the thread handle from the user defined thread structure
91        struct thread_desc* thrd = get_thread( this );
92
93        // First suspend, once the thread arrives here,
94        // the function pointer to main can be invalidated without risk
95        __finish_creation( thrd );
96
97        // Officially start the thread by enabling preemption
98        enable_interrupts( __cfaabi_dbg_ctx );
99
100        // Call the main of the thread
101        main( this );
102
103        // To exit a thread we must :
104        // 1 - Mark it as halted
105        // 2 - Leave its monitor
106        // 3 - Disable the interupts
107        // 4 - Final suspend
108        // The order of these 4 operations is very important
109        //Final suspend, should never return
110        __leave_thread_monitor( thrd );
111        __cabi_abort( "Resumed dead thread" );
112}
113
114
115void CtxStart(
116        void (*main)(void *),
117        struct coroutine_desc *(*get_coroutine)(void *),
118        void *this,
119        void (*invoke)(void *)
120) {
121        struct coroutine_desc * cor = get_coroutine( this );
122        struct __stack_t * stack = cor->stack.storage;
123
124#if defined( __i386 )
125
126        struct FakeStack {
127            void *fixedRegisters[3];              // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
128            void *rturn;                          // where to go on return from uSwitch
129            void *dummyReturn;                    // fake return compiler would have pushed on call to uInvoke
130            void *argument[3];                    // for 16-byte ABI, 16-byte alignment starts here
131            void *padding;                        // padding to force 16-byte alignment, as "base" is 16-byte aligned
132        };
133
134        cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
135        cor->context.FP = NULL;         // terminate stack with NULL fp
136
137        struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
138
139        fs->dummyReturn = NULL;
140        fs->argument[0] = this;     // argument to invoke
141        fs->rturn = invoke;
142
143#elif defined( __x86_64 )
144
145        struct FakeStack {
146                void *fixedRegisters[5];            // fixed registers rbx, r12, r13, r14, r15
147                void *rturn;                        // where to go on return from uSwitch
148                void *dummyReturn;                  // NULL return address to provide proper alignment
149        };
150
151        cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
152        cor->context.FP = NULL;         // terminate stack with NULL fp
153
154        struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
155
156        fs->dummyReturn = NULL;
157        fs->rturn = CtxInvokeStub;
158        fs->fixedRegisters[0] = this;
159        fs->fixedRegisters[1] = invoke;
160
161#elif defined( __ARM_ARCH )
162
163        struct FakeStack {
164                float fpRegs[16];                       // floating point registers
165                void *intRegs[9];                       // integer/pointer registers
166                void *arg[2];                           // placeholder for this pointer
167        };
168
169        cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
170        cor->context.FP = NULL;
171
172        struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
173
174        fs->intRegs[8] = CtxInvokeStub;
175        fs->arg[0] = this;
176        fs->arg[1] = invoke;
177
178#else
179        #error uknown hardware architecture
180#endif
181}
182
183// Local Variables: //
184// mode: c //
185// tab-width: 4 //
186// End: //
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