11 Questions
What are the three methods for passing information to functions in assembly?
In global memory, in registers, on the stack
What does the stack hold for C compatible functions?
Arguments, return address, previous frame's %ebp value, automatic variables, saved values for other compiler used registers
What is the C compiler return value convention?
The C compiler return value convention is to store the return value in the %eax register
What is the purpose of the 'pushl' instruction in Assembly Language?
The 'pushl' instruction is used to push a value onto the stack.
What is the purpose of the 'call' instruction in Assembly Language?
The 'call' instruction is used to call a function or subroutine.
What is the purpose of the 'movl' instruction in Assembly Language?
The 'movl' instruction is used to move data from one location to another.
What is the purpose of the 'ret' instruction in Assembly Language?
The 'ret' instruction is used to return from a function or subroutine.
What are the two mechanisms in the instruction set for calling and returning from functions?
Linux system calls and returns int $0x80 and iret (hardware saves eip, eflags) C library style function calls and returns call and ret (hardware saves eip)
What is a 'old school' way to pass data back and forth between assembly language functions?
Leaving all data in 'global memory'
How is a caller function in C typically written?
extern int mycode(int x, int y); int main(void){ ... z = mycode(x, y); ... }
What is the purpose of the 'call' and 'ret' mechanism in function calls?
To handle the code for calling a function and the code in the function itself.
Test your knowledge on calling sequences in assembly language programming and learn how to effectively coordinate the code for calling and returning functions. Explore the mechanisms involved and master the art of handling details in your programming endeavors.
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