We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
RTL: Difference between revisions
From SnesLab
(→External Links: hide archive URL for E&L) |
(more info) |
||
| Line 36: | Line 36: | ||
'''RTL''' (Return from Subroutine Long) is a [[65c816]] instruction used to return control from a subroutine that may have been called from a different [[bank]]. | '''RTL''' (Return from Subroutine Long) is a [[65c816]] instruction used to return control from a subroutine that may have been called from a different [[bank]]. | ||
RTL pulls the [[return address]] from the stack, but increments the value by one before loading it into the [[program counter]]. The calling bank is then pulled into the [[program bank register]]. In other words, RTL unwinds what JSL did to the stack. | |||
No flags are affected. | No flags are affected. | ||
Revision as of 21:27, 10 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (RTL) | 6B | 1 byte | 6 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
RTL (Return from Subroutine Long) is a 65c816 instruction used to return control from a subroutine that may have been called from a different bank.
RTL pulls the return address from the stack, but increments the value by one before loading it into the program counter. The calling bank is then pulled into the program bank register. In other words, RTL unwinds what JSL did to the stack.
No flags are affected.
Syntax
RTL
RTL works even in emulation mode, but it is intended primarily for native mode.
See Also
External Links
- Eyes & Lichty, page 494 on RTL
- Labiak, page 177 on RTL
- snes9x implementation of RTL: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2879
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.2.2.2