July 2025
Beginner
528 pages
13h 18m
English
Content preview from The Microprocessor
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CHAPTER 9Stack Operations
9.1 INTRODUCTION
In our programming exercises, we have been reserving data statically in memory sections such as .rodata, .data and .bss. This means that once memory is allocated for a data element, it remains reserved throughout the program execution. However, sometimes a program may require memory temporarily, only for the duration of a subroutine. For example, to save registers at the beginning of a subroutine and restore them before returning, or to store the local variables in a subroutine. Once the subroutine returns, this temporary storage can be made available to other subroutines.
To understand the memory usage pattern, let us take a sequence of subroutine calls: the main function calls subA and subB. subA, in turn, calls subA1 and ...
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