Re: [hatari-devel] Re: New GemdosParam variable in debugger (was: EmuTOS startup sequence vs. real TOS)

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On Mittwoch, 2. Mai 2018 21:41:58 CEST Eero Tamminen wrote:
> Can somebody explain why e.g. BIOS & XBIOS trap entries don't
> need to do that in Hatari code?

GemDOS_OpCode is executed by emulating the GEMDOS_OPCODE instruction, which is 
part of the cartridge code. The code there is executed by the TRAP #1 handler, 
and thus already in supervisor mode, after pushing the trap exception frame.

Whereas VDI, BIOS & XBIOS calls are intercepted in newcpu.c, before actually 
emulating the TRAP instruction.

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