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1 .data
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2
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3
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4 .text
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5
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6 //Save return label address for the coreLoop to pointer
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7 //Arguments: Pointer to variable holding address
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8 .globl saveCoreLoopReturnAddr
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9 saveCoreLoopReturnAddr:
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10 movl 0x4(%esp) , %eax #load pointer
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11 movl $coreLoopReturn, %ecx #load label address
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12 movl %ecx, (%eax) #save address
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13 ret
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14
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15
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16
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17 //Switches form CoreLoop to VP ether normal VP or the Master Loop
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18 //switch to virt procr's stack and frame ptr then jump to virt procr fn
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19 /* VirtProcr offsets:
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20 * 0xc stackPtr
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21 * 0x10 framePtr
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22 * 0x14 nextInstrPt
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23 * 0x1c coreLoopFramePtr
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24 * 0x20 coreLoopStackPtr
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25 *
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26 * _VMSMasterEnv offsets:
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27 * 0x24 coreLoopReturnPt
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28 * 0x2c masterLock
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29 */
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30 .globl switchToVP
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31 switchToVP:
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32 movl 0x4(%esp) , %ecx #get VirtProcr
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33 movl %esp , 0x20(%ecx) #save core loop stack pointer
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34 movl %ebp , 0x1c(%ecx) #save core loop frame pointer
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35 movl 0x0c(%ecx), %esp #restore stack pointer
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36 movl 0x10(%ecx), %ebp #restore frame pointer
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37 movl 0x14(%ecx), %eax #get jmp pointer
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38 jmp *%eax #jmp to VP
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39 coreLoopReturn:
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40 ret
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41
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42
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43 //switches to core loop. saves return address
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44 /* VirtProcr offsets:
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45 * 0xc stackPtr
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46 * 0x10 framePtr
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47 * 0x14 nextInstrPt
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48 * 0x1c coreLoopFramePtr
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49 * 0x20 coreLoopStackPtr
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50 *
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51 * _VMSMasterEnv offsets:
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52 * 0x24 coreLoopReturnPt
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53 * 0x28 coreLoopEndPt
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54 * 0x2c masterLock
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55 */
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56 .globl switchToCoreLoop
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57 switchToCoreLoop:
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58 movl 0x4(%esp) , %ecx #get VirtProcr
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59 movl $VPReturn , 0x14(%ecx) #store return address
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60 movl %esp , 0x0c(%ecx) #save stack pointer
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61 movl %ebp , 0x10(%ecx) #save frame pointer
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62 movl 0x20(%ecx), %esp #restore stack pointer
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63 movl 0x1c(%ecx), %ebp #restore frame pointer
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64 movl $_VMSMasterEnv, %ecx
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65 movl (%ecx) , %ecx
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66 movl 0x24(%ecx), %eax #get CoreLoopStartPt
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67 jmp *%eax #jmp to CoreLoop
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68 VPReturn:
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69 ret
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70
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71
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72
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73 //switches to core loop from master. saves return address
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74 //Releases masterLock so the next MasterLoop can be executed
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75 /* VirtProcr offsets:
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76 * 0xc stackPtr
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77 * 0x10 framePtr
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78 * 0x14 nextInstrPt
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79 * 0x1c coreLoopFramePtr
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80 * 0x20 coreLoopStackPtr
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81 *
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82 * _VMSMasterEnv offsets:
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83 * 0x24 coreLoopReturnPt
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84 * 0x2c masterLock
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85 */
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86 .globl masterSwitchToCoreLoop
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87 masterSwitchToCoreLoop:
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88 movl 0x4(%esp) , %ecx #get VirtProcr
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89 movl $MasterReturn, 0x14(%ecx) #store return address
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90 movl %esp , 0x0c(%ecx) #save stack pointer
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91 movl %ebp , 0x10(%ecx) #save frame pointer
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92 movl 0x20(%ecx), %esp #restore stack pointer
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93 movl 0x1c(%ecx), %ebp #restore frame pointer
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94 movl $_VMSMasterEnv, %ecx
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95 movl (%ecx) , %ecx
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96 movl 0x24(%ecx), %eax #get CoreLoopStartPt
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97 movl $0x0 , 0x2c(%ecx) #release lock
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98 jmp *%eax #jmp to CoreLoop
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99 MasterReturn:
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100 ret
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101
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102
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103 //Switch to terminateCoreLoop
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104 // no need to call because the stack is already set up for switchVP
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105 // and both functions have the same argument.
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106 // do not save register of VP because this function will never return
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107 /* VirtProcr offsets:
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108 * 0xc stackPtr
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109 * 0x10 framePtr
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110 * 0x14 nextInstrPt
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111 * 0x1c coreLoopFramePtr
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112 * 0x20 coreLoopStackPtr
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113 *
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114 * _VMSMasterEnv offsets:
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115 * 0x24 coreLoopReturnPt
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116 * 0x2c masterLock
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117 */
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118 .globl asmTerminateCoreLoop
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119 asmTerminateCoreLoop:
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120 movl 0x4(%esp) , %ecx #get VirtProcr
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121 movl 0x20(%ecx), %esp #restore stack pointer
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122 movl 0x1c(%ecx), %ebp #restore frame pointer
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123 movl $terminateCoreLoop, %eax
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124 jmp *%eax #jmp to CoreLoop
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125
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