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Rearranged paravirt function vector.

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- exit right below 6502 vectors.
- keep exit addr stable as it may be called from asm.
This commit is contained in:
Oliver Schmidt
2019-05-30 00:10:17 +02:00
parent c6bbea0bb0
commit 6efb71bea7
3 changed files with 25 additions and 30 deletions
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7
doc/sim65.sgml
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@@ -166,14 +166,9 @@ Other internal details:
Aside from the loaded binary, the reset vector at <tt/$FFFC/ will be
pre-loaded with the given <bf/reset address/.
<item>The <tt/exit/ address is <tt/$FFF1/.
<item>The <tt/exit/ address is <tt/$FFF9/.
Jumping to this address will terminate execution with the A register value as an exit code.
<item>The built-in functions are provided by 6 paravirtualization hooks present at
<tt/$FFF0-$FFF5/. Except for <tt/exit/, a <tt/JSR/ to one of these
addresses will return immediately after performing a special function.
These use cc65 calling conventions, and are intended for use with the sim65 target C library.
<item><tt/IRQ/ and <tt/NMI/ events will not be generated, though <tt/BRK/
can be used if the IRQ vector at <tt/$FFFE/ is manually prepared by the test code.