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What is SUB ADR LDM STRD BL.W? What does sp,sp,#0x28 mean? What does r3, r0, r1, r2 mean? What does my-strcpy and my_capitalise mean?

What is SUB ADR LDM STRD BL.W? What does sp,sp,#0x28 mean? What does r3, r0, r1, r2 mean? What does my-strcpy and my_capitalise mean?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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What is SUB ADR LDM STRD BL.W? What does sp,sp,#0x28 mean? What does r3, r0, r1, r2 mean? What does my-strcpy and my_capitalise mean?
Figure Q7 below shows a simple program written in C and complied in ARM Keil. Ox080006D4 B08A 33: 34: 35: OX080006D6 A307 OX080006D8 CBOF 0×080006DA E9CD2308 0×080006DE E9CD0106 36: 0×080006E2 A901 O×080006E4 A806 0×080006E6 F7FFFDA9 37: 38: OX080006EA A801 0×080006EC F7FFFDAD SUB const char a[] char b(20]: sp,sp,#0x28 "Hello world!"; ADR r3,(pc)+0x20 2 @0×080006F4 r3,(r0-r3) STRD r2,r3,(sp,#0x20] STRD r0,rl,/sp,#0x18) LDM my_strcpy (a, b), ADD ADD rl,sp,#0x04 r0,sp,#0x18 BL.W my_strepy (0x0800023C) my_capitalize (b); ADD r0,sp,#0x04 BL.W my_capitalize (0×0800024A) Figure 07
Transcribed Image Text:Figure Q7 below shows a simple program written in C and complied in ARM Keil. Ox080006D4 B08A 33: 34: 35: OX080006D6 A307 OX080006D8 CBOF 0×080006DA E9CD2308 0×080006DE E9CD0106 36: 0×080006E2 A901 O×080006E4 A806 0×080006E6 F7FFFDA9 37: 38: OX080006EA A801 0×080006EC F7FFFDAD SUB const char a[] char b(20]: sp,sp,#0x28 "Hello world!"; ADR r3,(pc)+0x20 2 @0×080006F4 r3,(r0-r3) STRD r2,r3,(sp,#0x20] STRD r0,rl,/sp,#0x18) LDM my_strcpy (a, b), ADD ADD rl,sp,#0x04 r0,sp,#0x18 BL.W my_strepy (0x0800023C) my_capitalize (b); ADD r0,sp,#0x04 BL.W my_capitalize (0×0800024A) Figure 07
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