Memory of a Program

Memory of a Program - Memory of a Program A program sees...

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Memory of a Program A program sees memory as an array of bytes that goes from address 0 to 232-1 (0 to 4GB-1) That is assuming a 32-bit architecture. 0 (4GB-1) 232- 1
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Memory Sections The memory is organized into sections called “memory mappings”. Stack Text Data Bss Heap Shared Libs 0 232-1
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Memory Sections Each section has different permissions: read/write/execute or a combination of them. Text- Instructions that the program runs Data – Initialized global variables. Bss – Uninitialized global variables. They are initialized to zeroes. Heap – Memory returned when calling malloc/new. It grows upwards. Stack – It stores local variables and return addresses. It grows downwards.
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Memory Sections Dynamic libraries – They are libraries shared with other processes. Each dynamic library has its own text, data, and bss. Each program has its own view of the memory
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