Cirrus Logic CS485 Instrukcja Użytkownika Pobierz pdf (Strona 10)

CS485G Spring 2015 10

iv. 1000

= −8. Try to negate this number.

v. 0111

= 7.

vi. 1001

= −7.

13 Compilation and disassembly in Linux

1. Compiler for C: gcc. Compiler for C++: g++.

2. Command-line options are by Unix convention marked with -.

-o ﬁlename put the output of compilation in ﬁlename

-E Don’t compile; just run the preprocessor

-S Compile but don’t assemble; result is ﬁlename.s

-c Compile and assemble, but don’t link; result is ﬁlename.o

-g Add debugging information to the result.

-On Turn on optimization level n (from 0 to 3)

3. Tools to inspect compiled code

(a) objdump -d ﬁlename: disassembles ﬁlename

(b) gdb ﬁlename: runs the debugger on ﬁlename; can disassemble

(d) strings ﬁlename: shows all the ASCII strings in ﬁlename.

(e) od ﬁlename: displays ﬁlename in numeric or character format.

(f) ldd ﬁlename: tells what dynamic libraries ﬁlename uses.

(g) dissy ﬁlename: graphical tool to inspect ﬁlename. You can in-

stall dissy by using apt-get.

14 Machine basics

1. Lecture 7, 1/30/2015 Lab 3

2. Lecture 8, 2/2/2015

3. An architecture, also called an instruction-set architecture (ISA), is

the part of a processor design that you need to know to read/write

assembler code. It includes the instruction set and the characteristics

of registers. Examples: x86 (also called IA-32), IPF (also called IA-64:

Itanium), x86 64.

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Cirrus Logic CS485 Instrukcja Użytkownika Strona 10