examples of stack frames

Once we've established the value of the arguments on line 8. (4 and 2 respectively)

Stack frame example .data sum DWORD ? .code push 6. ; second argument p g push 5. ; first argument call AddTwo. ; EAX = sum mov sumeax. ; save the sum.

Python (v3) Stack Frame Examples stack frame and creating an object on the heap for the value. ... variables for them in the stack frame.

ENTER instruction creates stack frame for a called procedure sets EBP to the base of the stack frame. ? reserves space for local variables. ? Example:.

2008?12?22? Stack frame example. AddTwo PROC push ebp mov ebpesp. ; base of stack frame mov eax

Stack frames support procedure calls. Example: 400544: callq 400550 <mult2>. 400549: movq. %rax(%rbx) ... Procedure Call Example (initial state).

function is called the stack frame or activation record. • Callee/Caller terminology? 3. The Stack Stack Frame Example. 6. 9. Recursive Example.

A procedure can explicitly access stack parameters using constant offsets from EBP. • Example: [ebp + 8]. • EBP is often called the base pointer or frame 

Stack frame example. AddTwo PROC push ebp mov ebpesp. ; base of stack frame mov eax

Stack Frames. • Stack Parameters. • Local Variables. • ENTER and LEAVE Instructions. • LOCAL Directive. Web site. Examples. • LOCAL Directive.

Simple Stack Frame Examples CS21 at Swarthmore College At the beginning of the programmainis called We createa new stack frame Sincemainhas no parameters the stackframe is empty 7 n = 4 8 out = f(n2) 9 print out 10 11 main() main:7 At the beginning of the programmainis called We createa new stack frame

Python (v3) Stack Frame Examples CS21 at Swarthmore College At the beginning of the programmainis called We createa new stack frame Sincemainhas no parameters the stackframe is empty 7 n = 4 8 out = f(n2) 9 print(out) 10 11 main() main:7 At the beginning of the programmainis called We createa new stack frame

• Stack Pointerpoints to slot above (below) current frame 20 Stack Frame Example 21 Stack Frame Example Dynamic Link (AKA Control Link) points to AR of the caller • Optional if size of caller AR is static and known • Used to restore stack pointer during return sequence 22 Stack Frame Example

The stack pointer must be adjusted to allocate the stack frame before any other use of the stack pointer register At most one frame pointer can be used in the function Use of a frame pointer is identified if the stack pointer value is moved into another regis-ter after the stack pointer has been adjusted to allocate the stack frame

This paper focuses on the layout of a stack frame; a companion paper (Olinsky et al 2004) addresses 300 incoming k = 0 spills completed region a newly allocated slot in k = ?12 (cursor) region under construction not yet allocated Fig 2 Contiguous allocation of a stack frame using a cursor

•Stack frame enables many parameters to be made available to the called routines •Stack frame of different subroutines can be stacked at the stack •When a subroutine finishes it jumps (returns to the return-address at the stack frame and Execution of the calling program resumes We learnt

main() At the beginning of the program main is called We create a new stack frame Since main has no parameters the stack frame is empty

Assembly Example 1 text globl main main: subu $sp$sp24 # stack frame is 6 words sw $ra20($sp) # save return address sw $fp16($sp)

Stack frames are allocated on the run-time stack; the stack grows downward from high addresses to low addresses Each stack frame has sufficient space allocated 

EXAMPLE: This subroutine calls one of five user subroutines based upon a user id code in the low byte of data register D0 The subroutine effects the A0 and D0 

The portion of “The Stack” used for an invocation of a function is called the stack frame or activation record Stack Frame Example

13 jui 2021 · is called the function's stack frame or activation record https://www cs princeton edu/courses/archive/spring03/cs320/notes/7-1 pdf  

Lecture 7: Subroutines and stack frames g Parameter passing though the stack n An example g Local variables and the stack frame g LINK and ULNK instructions

Registers are used as “working memory” to store intermediate values in a computation COMP1917 c Alan Blair 2012 COMP1917 12s2 Memory and Stack Frames 7

To access this data on the stack a pointer called the Stack Frame Motivation • Assume the following C code Best example is $ra – Local variables

Stack frames support procedure calls Example: 400544: callq 400550 400549: movq rax( rbx) Procedure Call Example (initial state)