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https://github.com/elliotnunn/powermac-rom.git
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3302c1ba99
Whenever a field was added to the end of the Primary System Area (PSA) record, the offsets of all other fields would change. When reversing NK version 02.27, I noticed that 32 bytes had been added to the end of the PSA between 02.27 and 02.28. To build a byte-perfect 02.27, all references to PSA fields must therefore use the record definition in NKPublic.s instead of a numeric offset. In this commit, all PSA references are identified by field name (_FFF if the field has not yet been reversed).
62 lines
1.1 KiB
ArmAsm
62 lines
1.1 KiB
ArmAsm
;_______________________________________________________________________
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; My additions to the NanoKernel, to go at the end of the code image
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;_______________________________________________________________________
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if &TYPE('NKDebugShim') != 'UNDEFINED'
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DeclareMPCall 200, NKDebug
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NKDebug
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; Lifted from NKxprintf:
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; Put the physical address of the r3 arg in r8
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rlwinm. r9, r11, 0, MSR_DRbit, MSR_DRbit ; IntSyscall sets this
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mr r8, r3
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beq @already_physical
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li r9, 0
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bl V2P ; takes page EA in r8, r9=0, returns page PA in r17
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beq @fail
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rlwimi r8, r17, 0, 0, 19
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@already_physical
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; Copy the command into the KDP buffer reserved for this purpose:
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; r8 = src
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; r29 = dest
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; r30 = ctr
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; r31 = val
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mfsprg r1, 0
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lwz r1, EWA.PA_KDP(r1)
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li r30, 0
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addi r29, r1, PSA.ThudBuffer
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@cmdloop
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lbzx r31, r8, r30
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stbx r31, r29, r30
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addi r30, r30, 1
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cmpwi r31, 0
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bne @cmdloop
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lwz r31, PSA._404(r1)
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stw r8, PSA._404(r1)
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bl panic
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lwz r8, PSA._404(r1)
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li r0, 0
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stw r0, 0(r8)
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stw r31, PSA._404(r1)
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b ReturnZeroFromMPCall
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@fail
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b ReturnMPCallOOM
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endif
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