Test your knowledge on in-line assembly code implementation in GCC compiler with this quiz! Learn about the benefits and challenges of using in-line assembly, and discover how to integrate it with C code. Get familiar with the machine language coding rules, including the i386 byte by byte binary instruction format and ModR/M 3-bit register codes. Plus, explore a sample function with in-line assembly code and analyze the resulting .s file to see the state of the stack and body of function logic. Strengthen

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Questions and Answers

What is in-line assembly code?

A way to put assembly instructions in-line between your C statements.

What do you need to know to integrate assembly code with C using in-line assembly code?

How the compiler locates variables, uses registers, and manages the stack.

Which of the following is an example of a function with in-line assembly code?

int foobar(int x, int *y) { asm("pushl %eax"); i = x; j = &i; *y = *j; asm("popl %eax"); return 0; }

What is the state of the stack at maximum depth in the assembled code?

%eax %ebx j i %ebp %eip x y Signup and view all the answers

Which of the following is an optional field in the i386 byte by byte binary instruction format?

Instruction Prefixes Signup and view all the answers

What is the advantage of generating optimal code for performance?

It is faster to fetch and execute Signup and view all the answers

Which of the following is a shorter machine code available for some instructions involving %eax?

%eax Signup and view all the answers

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Study Notes

GCC compiler allows for in-line assembly instructions in C code
In-line assembly is trickier to integrate than writing C callable functions
Requires knowledge of how the compiler locates variables, uses registers, and manages the stack
In-line assembly code executes faster than a function call to equivalent assembly code
Sample function with in-line assembly code provided
Resulting .s file shows state of the stack and body of function logic
Machine language coding rules involve various required and optional binary fields
i386 byte by byte binary instruction format includes instruction prefixes, op code, SIB, displacement, and data elements
ModR/M 3-bit register codes provided
Understanding machine language is important for generating optimal code for performance.