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DSP Core Reference Manual

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A-374 SC140 DSP Core Reference Manual
RTSTK
RTSTK Restore PC from Stack (AGU) RTSTK
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
Operation Assembler Syntax
(SP – 8) → PC
SP – 8 → SP
RTSTK
RTSTK
Forces a return from a subroutine or exception by restoring the program counter (PC) from the active stack
in memory. The restore to the PC is not from the RAS register, even if RAS is valid. The implicit pop is
done before the execution set in the delay slot is executed. The stack pointer decrements by 8 and RAS
becomes invalid. This instruction can be used to bypass RAS (for example, when the return address is
changed directly on the stack). RTSTK does one 32-bit long-word memory access.
Register Address Bit Name Description
SR[18] EXP Determines which stack pointer is used.
Register Address Bit Name Description
EMR[3] NMID Cleared .