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midterm - CS 220 Computer Systems II Architecture and...

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CS 220: Computer Systems II: Architecture and Programming Fall 2009 - Section A0 Midterm Exam - 2009/10/28 Name: ______________________________ ================================================================================ 1: Circle which of the flags (it can be any number of them) listed under each set of numbers will be set (to 1) after each pair of numbers is computed using 16-bit addition/subtraction (the flags names are short for "Overflow" (OF), "Carry" (CF), "Sign" (SF) and "Zero" (ZF)): 0x4000 0x0000 0xC000 0xC000 0x8008 + 0x4000 - 0x0001 - 0x8000 + 0xC000 - 0x8008 -------- -------- -------- -------- -------- OF CF OF CF OF CF OF CF OF CF SF ZF SF ZF SF ZF SF ZF SF ZF ================================================================================ 2: Circle which one (1) of the following would be the value of %ch if the following code is executed (assume var1 is defined as ".int" elsewhere): ========================= movl $0x1234567, %eax movl %eax, var1 movw var1, %cx ========================= a) 0x12 b) 0x34 c) 0x56 d) 0x07 e) 0x01 f) 0x23 g) 0x45 h) 0x67 i) 0x21 j) 0x43 k) 0x65 l) 0x70 m) 0x10 n) 0x32 o) 0x54 p) 0x76 ================================================================================ 3: Convert each of the following 8-bit signed numbers to decimal: 0xF8 0x40 0x66 0x80 0xC0 ================================================================================ 4: Circle which one (1) of the following is the register which GCC uses to point to the stack (the Stack Pointer): a) eax b) ebx c) ecx d) edx
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e) ebp f) esp g) edi h) esi ================================================================================ 5: Circle which flags (it can be any number of them) listed under each
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