What makes the stack concept useful in embedded programming?
2021年8月4日 · Compiled languages lead to calling conventions, and local and global variables. Local variables, return addresses, etc lead to a stack and stack pointer and stack pointer relative addressing. Without the stack pointer (or stack frame pointer) relative addressing instructions, compiled languages become much less attractive for that processor.
Main Stack Pointer(MSP) vs Process Stack Pointer(PSP)
2018年10月29日 · When an exception happens, a stack frame gets pushed to the currently active stack pointer, and then switches to use the MSP for the exception handler. In a multi tasking system, if the scheduler caused the exception, it is at this point that you change where the PSP is pointing to be the stack pointer for the next task, and return from the ...
Embedded: Main Stack Pointer and Process Stack Pointer co …
2021年7月31日 · There's one stack for the "operating system" (usually an RTOS, but could be something like Linux), and a separate stack for each process/task/thread running in the application code. The OS always uses the main stack pointer (mainly for quick response to interrupts, etc.), and the process stack pointer points to the stack of whichever process is ...
STM32 debugger shows wrong stack pointer
2024年12月1日 · Additionally, also the value reported in the register sp (stack pointer) is showing problems: according to the code that I have written, it should report the value saved in _estack (which is 0x3001FFFF). Obviously this is not happening.
STM32F103: Custom bootloader weird behaviour with stack pointer
2021年12月16日 · Here I saw that the first value of the hex file is 0x20000408 - the initial stack pointer value (in RAM space), if I understand everything correctly. In the bootloader hex itself, the initial stack pointer value is 0x20001250 (compiled with keil uVision 5). However, in all applications I compile from Stm32CubeIDE that I use, the value is ...
Storing data in stack - Electrical Engineering Stack Exchange
2020年5月12日 · The Stack Pointer in an 8085 contains the address of the last valid data that was pushed onto the Stack. When new data is pushed, this data should not be overwritten (obviously) and the Stack Pointer is decreased by 1 (or two when writing 16-bit data) before writing new data.
Manually storing the stack pointer rather than using push and pop ...
2017年3月19日 · C is a bottom-up stack where the stack pointer addresses the most recent value D is a bottom-up stack where the stack pointer addresses the next insertion point All of them are valid ways for a CPU to implement a stack, and it would be up to the micro-architecture choice of the CPU, or the OS calling convention if the CPU doesn't have explicit ...
ZiLOG Z80 Stack Pointer Location in Memory?
2020年3月10日 · Doesn't the stack pointer, among other CPU registers like PC,..reside in CPU? But if you are asking to which address the stack pointer is pointing at, then is a different story. Don't know about Z80, but usually it points to the top off the available memory e.g. -1 (FFFF) and it decrements, it makes sense since you are loading static variables from bottom to the top , …
embedded - Electrical Engineering Stack Exchange
Isn't the program supposed to automatically increment the stack pointer after every instruction? No. You're confusing the stack pointer with the program counter. The PC is incremented after every instruction. I don't really know why the stack pointer is decremented by 1 word size. To make room on the stack for the local variable f.
How can I find the current position of the stack without a stack ...
2016年9月27日 · Push a known value on the stack, say 0x77. Scan the whole stack space for this value (you know start and maximum size of the stack). Once you find 0x77 somwhere, execute a POP instruction and push 0x88. Check that memory address again. If it changed to 0x88, that's the top of your stack. Go to 6.