CS1021 Tutorial 7 Advanced LDR and STR Instructions Q1 If R1 = 0x1000 and R4 = 8, what memory location (in hexadecimal) is loaded into R0 and what is the value of R1 (in hexadecimal) after each of the following instructions has been executed. (i) LDR (ii) LDR (iii) LDR (iv) LDR (v) LDR (vi) […]
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LOGIC AND SHIFT INSTRUCTIONS ARM Logic Instructions C/C++/Java operator src1 & src2 src1 ^ src2 src1 | src2 ~src2 ~(src1 | src2) (src1 & ~src2) • AND • EOR • ORR • MVN • ORN • BIC Examples ORR R0, R1, R2 AND R0, R0, #0x0F EORS R1, R3, R0 dst = src1 AND src2
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FLOW CONTROL Program Flow Control • BY DEFAULT, the program counter is incremented by 4 when each instruction is executed (PC = PC + 4) • next sequential instruction is then fetched, decoded and executed • need to be able alter this sequential program flow in order to write more useful programs • normally a
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INTRODUCTION CS1021 Introduction to Computing Prof Jeremy Jones Rm 4.16 top floor South Leinster St (SLS) jones@scss.tcd.ie CS1021 © 2018 jones@scss.tcd.ie School of Computer Science and Statistics, Trinity College Dublin 12-Nov-18 1 South Leinster St INTRODUCTION CS1021 and CS1022 CS1021 Introduction to Computing I (5 ECTS) • Semester 1 • ICS, CSB and CSL CS1022
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CS1021 Tutorial 5 Logic and Shift Instructions Q1 Calculate, in hexadecimal, the results of the following 8 bit expressions (i) 0x96 & 0xF0 0x90 (ii) 0x96 | 0x0F 0x9F (iii) 0xAA ^ 0xF0 0x5A (iv) ~0xA5 0x5A (v) 0x96 >> 2 0x25 and 32-bit expressions (vi) 0x0123 > 24 0x12 (viii) 0x12345678 >> 16 0x1234
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CS1021 Tutorial 6 Reading and Writing to Memory Q1 if a, b and c are 32bit signed integers stored at memory addresses 0x40000000, 0x40000004 and 0x40000008 respectively, write ARM assembly language instructions to compute: Q2 If a, b and c are 256 bit integers stored at memory addresses 0x400000000, 0x40000020 and 0x40000040 respectively, write ARM
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MEMORY CS1021 AFTER READING WEEK Mid-Semester Test • NOW Thurs 8th Nov @ 9am in Goldsmith Hall (ALL students to attend at 9am) Final 2 Labs • Lab5 2-Nov-18, due 16-Nov-18 (2 weeks duration) • Lab6 16-Nov-19, due 30-Nov-18 (2 weeks duration) End of Semester Exam • written 2 hour exam (week of 12-Dec-18) •
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CS1021 Tutorial 4 Condition Code Flags Q2 For each ARM Assembly Language code segment below, determine the value stored in R0 and the state of the N (Negative), Z (Zero), C (Carry) and V (oVerflow) flags after the instructions have been executed (i) LDR LDR R1, =0x00000001 ADDS R0, R0, R1 R0, =0x00000000 (ii) LDR
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CS1021 Tutorial 5 Logic and Shift Instructions Q1 Calculate, in hexadecimal, the results of the following 8 bit expressions (i) 0x96 & 0xF0 (ii) 0x96 | 0x0F (iii) 0xAA ^ 0xF0 (iv) ~0xA5 (v) 0x96 >> 2 and 32 bit expressions (vi) 0x0123 > 24 (viii) 0x12345678 >> 16 (ix) (0x12345678 >> 16) & 0xFF
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CS1021 Tutorial 7 Advanced LDR and STR Instructions Q1 If R1 = 0x1000 and R4 = 8, what memory location (in hexadecimal) is loaded into R0 and what is the value of R1 (in hexadecimal) after each of the following instructions has been executed. Q2 Given an array b stored at memory address 0x40001000 containing
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