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Every [TSO object](commentary/rts/heap-objects#thread-state-objects) contains a stack. The stack of a TSO grows downwards, with the topmost (most recently pushed) word pointed to by `tso->sp`, and the bottom of the stack given by `tso->stack + tso->stack_size`.
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Every [TSO object](commentary/rts/heap-objects#thread-state-objects) contains a stack (`tso->stackobj`). The stack of a TSO grows downwards, with the topmost (most recently pushed) word pointed to by `tso->stackobj->sp`, and the bottom of the stack given by `tso->stackobj->stack + tso->stackobj->stack_size`.
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