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Michael Specht 2018-02-16 12:51:57 +01:00
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README.md
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@ -36,6 +36,22 @@ We specified some source files (which will get compiled automatically) and some
Furthermore, we can disable subroutines by replacing the first opcode with a RTS (`instant_rts`). This is necessary in some cases because Champ does not emulate hardware and thus can not load data from disk, for example.
### Defining watches
You can watch registers or variables at certain program counter addresses by inserting a _champ directive_ in a comment after the respective code line in your assembler source code. All champ directives start with an _at sign_ (@). Here's an example:
```
LDA #2 ; load 2 into accumulator
ASL ; multiply by two
STA SOMEWHERE ; store result @Au
```
With the `@Au` directive, we tell champ to monitor the A register and interpret it as an unsigned 8 bit integer (likewise, `@As` would treat the value as a signed 8 bit integer).
By default, all champ values get recorded before the operation has been executed. To get the value after the operation, you can write: `@Au(post)`.
### Running the profiler
To start champ, type:
```

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plot3d.yaml
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load:
0x6000: plot3d/plot3d242c.s
0x6000: plot3d/plot3d242.s
0x1200: plot3d/multtab.s
0x8400: plot3d/ldrwtab.s
0x8900: plot3d/SINETABLE