DerekChiou_EE306_Spring2009_Lecture20

DerekChiou_EE306_Spring2009_Lecture20 -...

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© Derek Chiou Lecture 20: Protection Prof. Derek Chiou University of Texas at Austin
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Administration Using Skype as an alternative to coming to office My username is derekchiou Feel free to call during office hours (MT 5PM-6PM) Exam 2 now scheduled for the 20 th Lab 2 due on Sunday, the 12 th at 11:59PM However, Lab 3 likely will be assigned before the 12 th at 11:59PM 4/8/2009 © Derek Chiou : EE306: Lecture 20 2
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4/8/2009 © Derek Chiou : EE306: Lecture 20 Recap & Outline Recap Quick overview of Traps Protection Outline Program Status Register Handling Interrupts/Service Routines 3
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Simulator Example 4/8/2009 © Derek Chiou : EE306: Lecture 20 4
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Program Status Register 4/8/2009 © Derek Chiou : EE306: Lecture 20 5
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Two Stacks User stack User Stack Pointer (USP) Supervisor stack Supervisor Stack Pointer (SSP) At any given time, in User mode or Supervisor mode R6 is corresponding stack pointer On switch, current R6 saved to appropriate special register Saved.SSP Saved.USP 4/8/2009 © Derek Chiou : EE306: Lecture 20 6
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Example 4/8/2009 © Derek Chiou : EE306: Lecture 20 7
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Binary to ASCII Conversion 4/8/2009 © Derek Chiou : EE306: Lecture 20 8
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ASCII to Binary Conversion 4/8/2009 © Derek Chiou : EE306: Lecture 20 9
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ASCII to Binary 4/8/2009 © Derek Chiou : EE306: Lecture 20 10
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Binary to ASCII Convert from Binary to ASCII?
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