![]() So you can either declare that array in some data area, then to work with it, you load symbol data1 into register ("load address of data1"), and use that to fetch memory content from that address. map file to see where the code and data are targeted to land). So for your particular platform: google for memory mappings on web and check the linker script (for start just use linker option to produce. ARM ASSEMBLY READWRITE HOW TOWhere these will land in physical memory after loading executable depends on how the executable is linked (linker is using a script file which is helping him to decide which AREA to put where, and how to create symbol table for dynamic relocation done by the executable loader, by editing the linker script you can adjust where the code and data land, but normally you don't need to do that).Īlso the linker script and assembler directives can affect size of available stack, and where it is mapped in physical memory. With similar AREA myData, DATA, READWRITE you can start section where it's possible to define data like data1 DCD 1,2,3, this will compile as three words with values 1, 2, 3 in consecutive bytes, with label data1 pointing to the first byte of first word. ![]() How can I operate with values declared in this way ? Please explain how can I implement this using assembly only without any C code, even without stack, just with raw data.ĪREA ARM, CODE, READONLY - this marks start of section for code in the source. I wonder how can I implement this example using only assembly.īTW Where DCD declared variables are stored in the memory ? This function takes this values from the stack and sorts them and put back on the stack. ![]() ![]() Int arr = Īs far as I understand this code creates array of integers on the stack and calls _sortc function which implemented in assembly. I have found example of simple sorting algorithm AREA ARM, CODE, READONLYĪnd this assembly should be called this way from C code #define MAX_ELEMENTS 10 I have difficulties with understanding memory ARM memory map. ![]()
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