Default Memory Configuration (Default RV32)

When RARS is left on its default settings, the address space segments are allocated as follows:

Memory Segment	Base/Start Address	End Address	Purpose & Behavior
Reserved	0x0000_0000	0x003F_FFFF	Reserved for the system; inaccessible to user programs.
Text Section (.text)	0x0040_0000	0x0FFF_FFFF	Holds compiled machine code instructions.
Data Section (.data)	0x1000_0000 / 0x1001_0000	0x1003_FFFF	Holds static and global variables.
Heap	0x1004_0000	0x7FFF_FFFF	Dynamic memory allocation; grows upward via system calls.
Stack	0x7FFF_FE00	0x7FFF_FFFF	Initialized at the top of memory; grows downward toward the heap.
MMIO	0xFFFF_0000	0xFFFF_FFFF	Memory-Mapped I/O (e.g., keyboard and display tools).

Alternative Memory Configurations

RARS allows you to change the underlying architecture and address space layout to match different requirements or operating systems. You can modify this by navigating to
Settings -> Memory Configuration... in the RARS menu.

64-bit Address Space (RV64): When simulating 64-bit RISC-V, the entire memory architecture shifts to handle standard 64-bit pointers, introducing significantly larger gaps between segments and expanding the reachable virtual memory limits.