1 | |
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2 | #include <stdbool.h> |
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3 | #include <stdlib.h> |
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4 | #include <stdio.h> |
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5 | |
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6 | #include "libhdr.h" |
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7 | #include "invoke.h" |
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8 | |
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9 | struct machine_context_t { |
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10 | void *SP; |
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11 | void *FP; |
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12 | void *PC; |
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13 | }; |
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14 | |
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15 | extern void coInvokeStub( void ); |
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16 | |
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17 | // magically invoke the "main" of the most derived class |
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18 | // Called from the kernel when starting a coroutine or task so must switch back to user mode. |
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19 | void __invokeCoroutine__F_P9scoVtablePv__1(struct coVtable *vtable, void* vthis) |
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20 | { |
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21 | LIB_DEBUG_PRINTF("Invoke : Received %p (v %p)\n", vthis, vtable); |
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22 | |
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23 | struct coroutine* cor = vtable->this_coroutine(vthis); |
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24 | |
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25 | cor->state = Active; |
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26 | |
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27 | vtable->main(vthis); |
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28 | } |
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29 | |
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30 | void __startCoroutine__A0_1_0___this_coroutine__PFP10scoroutine_Pd0___co_main__PF_Pd0___vtable__PFP9scoVtable_Pd0__F_Pd0PF_P9scoVtablePv___1( |
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31 | struct coroutine *(*this_coroutine)(void * ), |
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32 | void (*co_main)(void *), |
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33 | struct coVtable *(*get_vtable)(void *), |
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34 | void *vthis, |
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35 | void (*invoke)(struct coVtable *, void *) |
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36 | ) { |
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37 | LIB_DEBUG_PRINTF("StartCoroutine : Passing in %p (v %p) to %p\n", vthis, vtable, invoke); |
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38 | |
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39 | struct coVtable * vtable = get_vtable( vthis ); |
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40 | struct coroutine* this = this_coroutine( vthis ); |
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41 | struct coStack_t* stack = &this->stack; |
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42 | |
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43 | #if defined( __i386__ ) |
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44 | |
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45 | struct FakeStack { |
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46 | void *fixedRegisters[3]; // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant) |
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47 | void *rturn; // where to go on return from uSwitch |
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48 | void *dummyReturn; // fake return compiler would have pushed on call to uInvoke |
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49 | void *argument[2]; // for 16-byte ABI, 16-byte alignment starts here |
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50 | void *padding[2]; // padding to force 16-byte alignment, as "base" is 16-byte aligned |
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51 | }; |
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52 | |
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53 | ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack ); |
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54 | ((struct machine_context_t *)stack->context)->FP = NULL; // terminate stack with NULL fp |
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55 | |
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56 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL; |
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57 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->argument[0] = vtable; // argument to invoke |
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58 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->argument[1] = vthis; // argument to invoke |
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59 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = invoke; |
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60 | |
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61 | #elif defined( __x86_64__ ) |
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62 | |
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63 | struct FakeStack { |
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64 | void *fixedRegisters[5]; // fixed registers rbx, r12, r13, r14, r15 |
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65 | void *rturn; // where to go on return from uSwitch |
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66 | void *dummyReturn; // NULL return address to provide proper alignment |
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67 | }; |
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68 | |
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69 | ((struct machine_context_t *)stack->context)->SP = (char *)stack->base - sizeof( struct FakeStack ); |
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70 | ((struct machine_context_t *)stack->context)->FP = NULL; // terminate stack with NULL fp |
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71 | |
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72 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->dummyReturn = NULL; |
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73 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->rturn = coInvokeStub; |
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74 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[0] = vtable; |
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75 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[1] = vthis; |
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76 | ((struct FakeStack *)(((struct machine_context_t *)stack->context)->SP))->fixedRegisters[2] = invoke; |
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77 | #else |
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78 | #error Only __i386__ and __x86_64__ is supported for threads in cfa |
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79 | #endif |
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80 | } |
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