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JSL: Difference between revisions
From SnesLab
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* the [[return address]] (JSL's opcode location plus 3) is pushed onto the stack | * the [[return address]] (JSL's opcode location plus 3) is pushed onto the stack | ||
* control is transferred to the target location | * control is transferred to the target location | ||
[[JSR]] is a smaller/faster alternative if you know the subroutine is in the same bank as the call. | |||
=== See Also === | === See Also === | ||
* [[RTS]] | * [[RTS]] | ||
* [[RTL]] | * [[RTL]] | ||
Latest revision as of 02:14, 11 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Absolute Long | 22 | 4 bytes | 8 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
JSL (Jump to Subroutine Long) is a 65c816 instruction that transfers control to a subroutine, possibly one in a different bank.
No flags are affected.
Syntax
JSL long
JSL works even in emulation mode, but it is intended primarily for native mode.
Execution Sequence
- the current program counter bank register pushed onto the stack
- the return address (JSL's opcode location plus 3) is pushed onto the stack
- control is transferred to the target location
JSR is a smaller/faster alternative if you know the subroutine is in the same bank as the call.
See Also
External Links
- Eyes & Lichty, page 460 on JSL
- Labiak, page 147 on JSL
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.2.2.1