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JSL: Difference between revisions
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'''JSL''' (Jump to Subroutine Long) is a [[65c816]] instruction that transfers control to a subroutine, possibly one in a different [[bank]]. | '''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 ==== | |||
<pre> | |||
JSL long | |||
</pre> | |||
JSL works even in [[emulation mode]], but it is intended primarily for native mode. | |||
==== Execution Sequence ==== | ==== Execution Sequence ==== | ||
* the current program counter bank is pushed onto the stack | * 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 === | === See Also === | ||
* [[RTS]] | * [[RTS]] | ||
* [[RTL]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/460 page 460] on JSL | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n157 page 147] on JSL | ||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.2.2.1 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
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