mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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1334 lines
39 KiB
C
1334 lines
39 KiB
C
/*
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basic, incomplete SSP160x (SSP1601?) interpreter
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with SVP memory controller emu
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(c) Copyright 2008, Grazvydas "notaz" Ignotas
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Free for non-commercial use.
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For commercial use, separate licencing terms must be obtained.
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Modified for Genesis Plus GX (Eke-Eke), added big endian support, fixed mode & addr
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*/
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/*
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* Register info
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*
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* 0. "-"
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* size: 16
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* desc: Constant register with all bits set (0xffff).
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*
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* 1. "X"
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* size: 16
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* desc: Generic register. When set, updates P (P = X * Y * 2)
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*
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* 2. "Y"
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* size: 16
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* desc: Generic register. When set, updates P (P = X * Y * 2)
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*
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* 3. "A"
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* size: 32
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* desc: Accumulator.
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*
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* 4. "ST"
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* size: 16
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* desc: Status register. From MAME: bits 0-9 are CONTROL, other FLAG
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* fedc ba98 7654 3210
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* 210 - RPL (?) "Loop size". If non-zero, makes (rX+) and (rX-) respectively
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* modulo-increment and modulo-decrement. The value shows which
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* power of 2 to use, i.e. 4 means modulo by 16.
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* (e: fir16_32.sc, IIR_4B.SC, DECIM.SC)
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* 43 - RB (?)
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* 5 - GP0_0 (ST5?) Changed before acessing PM0 (affects banking?).
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* 6 - GP0_1 (ST6?) Cleared before acessing PM0 (affects banking?). Set after.
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* datasheet says these (5,6) bits correspond to hardware pins.
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* 7 - IE (?) Not directly used by SVP code (never set, but preserved)?
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* 8 - OP (?) Not used by SVP code (only cleared)? (MAME: saturated value
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* (probably means clamping? i.e. 0x7ffc + 9 -> 0x7fff))
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* 9 - MACS (?) Not used by SVP code (only cleared)? (e: "mac shift")
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* a - GPI_0 Interrupt 0 enable/status?
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* b - GPI_1 Interrupt 1 enable/status?
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* c - L L flag. Carry?
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* d - Z Zero flag.
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* e - OV Overflow flag.
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* f - N Negative flag.
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* seen directly changing code sequences:
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* ldi ST, 0 ld A, ST ld A, ST ld A, ST ldi st, 20h
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* ldi ST, 60h ori A, 60h and A, E8h and A, E8h
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* ld ST, A ld ST, A ori 3
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* ld ST, A
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*
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* 5. "STACK"
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* size: 16
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* desc: hw stack of 6 levels (according to datasheet)
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*
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* 6. "PC"
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* size: 16
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* desc: Program counter.
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*
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* 7. "P"
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* size: 32
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* desc: multiply result register. P = X * Y * 2
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* probably affected by MACS bit in ST.
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*
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* 8. "PM0" (PM from PMAR name from Tasco's docs)
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* size: 16?
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* desc: Programmable Memory access register.
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* On reset, or when one (both?) GP0 bits are clear,
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* acts as status for XST, mapped at 015004 at 68k side:
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* bit0: ssp has written something to XST (cleared when 015004 is read)
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* bit1: 68k has written something through a1500{0|2} (cleared on PM0 read)
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*
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* 9. "PM1"
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* size: 16?
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* desc: Programmable Memory access register.
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* This reg. is only used as PMAR.
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*
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* 10. "PM2"
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* size: 16?
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* desc: Programmable Memory access register.
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* This reg. is only used as PMAR.
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*
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* 11. "XST"
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* size: 16?
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* desc: eXternal STate. Mapped to a15000 and a15002 at 68k side.
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* Can be programmed as PMAR? (only seen in test mode code)
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* Affects PM0 when written to?
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*
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* 12. "PM4"
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* size: 16?
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* desc: Programmable Memory access register.
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* This reg. is only used as PMAR. The most used PMAR by VR.
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*
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* 13. (unused by VR)
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*
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* 14. "PMC" (PMC from PMAC name from Tasco's docs)
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* size: 32?
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* desc: Programmable Memory access Control. Set using 2 16bit writes,
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* first address, then mode word. After setting PMAC, PMAR sould
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* be blind accessed (ld -, PMx or ld PMx, -) to program it for
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* reading and writing respectively.
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* Reading the register also shifts it's state (from "waiting for
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* address" to "waiting for mode" and back). Reads always return
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* address related to last PMx register accressed.
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* (note: addresses do not wrap).
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*
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* 15. "AL"
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* size: 16
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* desc: Accumulator Low. 16 least significant bits of accumulator.
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* (normally reading acc (ld X, A) you get 16 most significant bits).
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*
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*
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* There are 8 8-bit pointer registers rX. r0-r3 (ri) point to RAM0, r4-r7 (rj) point to RAM1.
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* They can be accessed directly, or 2 indirection levels can be used [ (rX), ((rX)) ],
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* which work similar to * and ** operators in C, only they use different memory banks and
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* ((rX)) also does post-increment. First indirection level (rX) accesses RAMx, second accesses
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* program memory at address read from (rX), and increments value in (rX).
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*
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* r0,r1,r2,r4,r5,r6 can be modified [ex: ldi r0, 5].
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* 3 modifiers can be applied (optional):
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* + : post-increment [ex: ld a, (r0+) ]. Can be made modulo-increment by setting RPL bits in ST.
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* - : post-decrement. Can be made modulo-decrement by setting RPL bits in ST (not sure).
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* +!: post-increment, unaffected by RPL (probably).
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* These are only used on 1st indirection level, so things like [ld a, ((r0+))] and [ld X, r6-]
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* ar probably invalid.
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*
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* r3 and r7 are special and can not be changed (at least Samsung samples and SVP code never do).
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* They are fixed to the start of their RAM banks. (They are probably changeable for ssp1605+,
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* Samsung's old DSP page claims that).
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* 1 of these 4 modifiers must be used (short form direct addressing?):
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* |00: RAMx[0] [ex: (r3|00), 0] (based on sample code)
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* |01: RAMx[1]
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* |10: RAMx[2] ? maybe 10h? accortding to Div_c_dp.sc, 2
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* |11: RAMx[3]
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*
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*
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* Instruction notes
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*
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* ld a, * doesn't affect flags! (e: A_LAW.SC, Div_c_dp.sc)
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*
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* mld (rj), (ri) [, b]
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* operation: A = 0; P = (rj) * (ri)
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* notes: based on IIR_4B.SC sample. flags? what is b???
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*
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* mpya (rj), (ri) [, b]
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* name: multiply and add?
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* operation: A += P; P = (rj) * (ri)
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*
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* mpys (rj), (ri), b
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* name: multiply and subtract?
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* notes: not used by VR code.
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*
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* mod cond, op
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* mod cond, shr does arithmetic shift
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*
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* 'ld -, AL' and probably 'ld AL, -' are for dummy assigns
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*
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* memory map:
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* 000000 - 1fffff ROM, accessable by both
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* 200000 - 2fffff unused?
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* 300000 - 31ffff DRAM, both
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* 320000 - 38ffff unused?
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* 390000 - 3907ff IRAM. can only be accessed by ssp?
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* 390000 - 39ffff similar mapping to "cell arrange" in Sega CD, 68k only?
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* 3a0000 - 3affff similar mapping to "cell arrange" in Sega CD, a bit different
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*
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* 30fe02 - 0 if SVP busy, 1 if done (set by SVP, checked and cleared by 68k)
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* 30fe06 - also sync related.
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* 30fe08 - job number [1-12] for SVP. 0 means no job. Set by 68k, read-cleared by SVP.
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*
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* + figure out if 'op A, P' is 32bit (nearly sure it is)
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* * does mld, mpya load their operands into X and Y?
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* * OP simm
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*
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* Assumptions in this code
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* P is not directly writeable
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* flags correspond to full 32bit accumulator
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* only Z and N status flags are emulated (others unused by SVP)
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* modifiers for 'OP a, ri' are ignored (invalid?/not used by SVP)
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* 'ld d, (a)' loads from program ROM
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*/
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#include "shared.h"
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#define u32 unsigned int
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/*#define USE_DEBUGGER*/
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/* 0 */
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#define rX ssp->gr[SSP_X].byte.h
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#define rY ssp->gr[SSP_Y].byte.h
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#define rA ssp->gr[SSP_A].byte.h
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#define rST ssp->gr[SSP_ST].byte.h /* 4 */
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#define rSTACK ssp->gr[SSP_STACK].byte.h
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#define rPC ssp->gr[SSP_PC].byte.h
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#define rP ssp->gr[SSP_P]
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#define rPM0 ssp->gr[SSP_PM0].byte.h /* 8 */
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#define rPM1 ssp->gr[SSP_PM1].byte.h
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#define rPM2 ssp->gr[SSP_PM2].byte.h
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#define rXST ssp->gr[SSP_XST].byte.h
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#define rPM4 ssp->gr[SSP_PM4].byte.h /* 12 */
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/* 13 */
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#define rPMC ssp->gr[SSP_PMC] /* will keep addr in .h, mode in .l */
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#define rAL ssp->gr[SSP_A].byte.l
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#define rA32 ssp->gr[SSP_A].v
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#define rIJ ssp->ptr.r
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#define IJind (((op>>6)&4)|(op&3))
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#define GET_PC() (PC - (unsigned short *)svp->iram_rom)
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#define GET_PPC_OFFS() ((unsigned int)PC - (unsigned int)svp->iram_rom - 2)
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#define SET_PC(d) PC = (unsigned short *)svp->iram_rom + d
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#define REG_READ(r) (((r) <= 4) ? ssp->gr[r].byte.h : read_handlers[r]())
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#define REG_WRITE(r,d) { \
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int r1 = r; \
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if (r1 >= 4) write_handlers[r1](d); \
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else if (r1 > 0) ssp->gr[r1].byte.h = d; \
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}
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/* flags */
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#define SSP_FLAG_L (1<<0xc)
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#define SSP_FLAG_Z (1<<0xd)
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#define SSP_FLAG_V (1<<0xe)
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#define SSP_FLAG_N (1<<0xf)
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/* update ZN according to 32bit ACC. */
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#define UPD_ACC_ZN \
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rST &= ~(SSP_FLAG_Z|SSP_FLAG_N); \
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if (!rA32) rST |= SSP_FLAG_Z; \
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else rST |= (rA32>>16)&SSP_FLAG_N;
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/* it seems SVP code never checks for L and OV, so we leave them out. */
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/* rST |= (t>>4)&SSP_FLAG_L; */
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#define UPD_LZVN \
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rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
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if (!rA32) rST |= SSP_FLAG_Z; \
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else rST |= (rA32>>16)&SSP_FLAG_N;
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/* standard cond processing. */
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/* again, only Z and N is checked, as SVP doesn't seem to use any other conds. */
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#define COND_CHECK \
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switch (op&0xf0) { \
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case 0x00: cond = 1; break; /* always true */ \
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case 0x50: cond = !((rST ^ (op<<5)) & SSP_FLAG_Z); break; /* Z matches f(?) bit */ \
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case 0x70: cond = !((rST ^ (op<<7)) & SSP_FLAG_N); break; /* N matches f(?) bit */ \
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default: break; \
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}
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/* ops with accumulator. */
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/* how is low word really affected by these? */
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/* nearly sure 'ld A' doesn't affect flags */
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#define OP_LDA(x) \
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rA = x
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#define OP_LDA32(x) \
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rA32 = x
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#define OP_SUBA(x) { \
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rA32 -= (x) << 16; \
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UPD_LZVN \
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}
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#define OP_SUBA32(x) { \
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rA32 -= (x); \
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UPD_LZVN \
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}
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#define OP_CMPA(x) { \
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u32 t = rA32 - ((x) << 16); \
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rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
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if (!t) rST |= SSP_FLAG_Z; \
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else rST |= (t>>16)&SSP_FLAG_N; \
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}
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#define OP_CMPA32(x) { \
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u32 t = rA32 - (x); \
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rST &= ~(SSP_FLAG_L|SSP_FLAG_Z|SSP_FLAG_V|SSP_FLAG_N); \
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if (!t) rST |= SSP_FLAG_Z; \
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else rST |= (t>>16)&SSP_FLAG_N; \
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}
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#define OP_ADDA(x) { \
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rA32 += (x) << 16; \
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UPD_LZVN \
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}
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#define OP_ADDA32(x) { \
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rA32 += (x); \
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UPD_LZVN \
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}
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#define OP_ANDA(x) \
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rA32 &= (x) << 16; \
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UPD_ACC_ZN
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#define OP_ANDA32(x) \
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rA32 &= (x); \
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UPD_ACC_ZN
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#define OP_ORA(x) \
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rA32 |= (x) << 16; \
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UPD_ACC_ZN
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#define OP_ORA32(x) \
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rA32 |= (x); \
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UPD_ACC_ZN
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#define OP_EORA(x) \
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rA32 ^= (x) << 16; \
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UPD_ACC_ZN
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#define OP_EORA32(x) \
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rA32 ^= (x); \
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UPD_ACC_ZN
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#define OP_CHECK32(OP) { \
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if ((op & 0x0f) == SSP_P) { /* A <- P */ \
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read_P(); /* update P */ \
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OP(rP.v); \
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break; \
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} \
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if ((op & 0x0f) == SSP_A) { /* A <- A */ \
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OP(rA32); \
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break; \
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} \
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}
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static ssp1601_t *ssp = NULL;
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static unsigned short *PC;
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static int g_cycles;
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#ifdef USE_DEBUGGER
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static int running = 0;
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static int last_iram = 0;
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#endif
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/* ----------------------------------------------------- */
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/* register i/o handlers */
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/* 0-4, 13 */
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static u32 read_unknown(void)
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{
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#ifdef LOG_SVP
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elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown read @ %04x", GET_PPC_OFFS());
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#endif
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return 0;
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}
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static void write_unknown(u32 d)
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{
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#ifdef LOG_SVP
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elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: unknown write @ %04x", GET_PPC_OFFS());
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#endif
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}
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/* 4 */
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static void write_ST(u32 d)
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{
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/* if ((rST ^ d) & 0x0007) elprintf(EL_SVP, "ssp RPL %i -> %i @ %04x", rST&7, d&7, GET_PPC_OFFS()); */
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#ifdef LOG_SVP
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if ((rST ^ d) & 0x0f98) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME ST %04x -> %04x @ %04x", rST, d, GET_PPC_OFFS());
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#endif
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rST = d;
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}
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/* 5 */
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static u32 read_STACK(void)
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{
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--rSTACK;
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if ((short)rSTACK < 0) {
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rSTACK = 5;
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#ifdef LOG_SVP
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elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack underflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
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#endif
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}
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return ssp->stack[rSTACK];
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}
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static void write_STACK(u32 d)
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{
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if (rSTACK >= 6) {
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#ifdef LOG_SVP
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elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: stack overflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
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#endif
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rSTACK = 0;
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}
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ssp->stack[rSTACK++] = d;
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}
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/* 6 */
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static u32 read_PC(void)
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{
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/* g_cycles--; */
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return GET_PC();
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}
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static void write_PC(u32 d)
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{
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SET_PC(d);
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g_cycles--;
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}
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/* 7 */
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static u32 read_P(void)
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{
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int m1 = (signed short)rX;
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int m2 = (signed short)rY;
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rP.v = (m1 * m2 * 2);
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return rP.byte.h;
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}
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/* ----------------------------------------------------- */
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static int get_inc(int mode)
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{
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int inc = (mode >> 11) & 7;
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if (inc != 0) {
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if (inc != 7) inc--;
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/* inc = (1<<16) << inc; */
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inc = 1 << inc; /* 0 1 2 4 8 16 32 128 */
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if (mode & 0x8000) inc = -inc; /* decrement mode */
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}
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return inc;
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}
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#define overwite_write(dst, d) \
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{ \
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if (d & 0xf000) { dst &= ~0xf000; dst |= d & 0xf000; } \
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if (d & 0x0f00) { dst &= ~0x0f00; dst |= d & 0x0f00; } \
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if (d & 0x00f0) { dst &= ~0x00f0; dst |= d & 0x00f0; } \
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if (d & 0x000f) { dst &= ~0x000f; dst |= d & 0x000f; } \
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}
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static u32 pm_io(int reg, int write, u32 d)
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{
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if (ssp->emu_status & SSP_PMC_SET)
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{
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/* this MUST be blind r or w */
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if ((*(PC-1) & 0xff0f) && (*(PC-1) & 0xfff0)) {
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#ifdef LOG_SVP
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elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: tried to set PM%i (%c) with non-blind i/o %08x @ %04x",
|
|
reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
|
|
#endif
|
|
ssp->emu_status &= ~SSP_PMC_SET;
|
|
return 0;
|
|
}
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
|
|
#endif
|
|
ssp->pmac[write][reg] = rPMC.v;
|
|
ssp->emu_status &= ~SSP_PMC_SET;
|
|
#ifdef LOG_SVP
|
|
if ((rPMC.v & 0x7f) == 0x1c && (rPMC.v & 0x7fff0000) == 0) {
|
|
elprintf(EL_SVP, "ssp IRAM copy from %06x", (ssp->mem.bank.RAM1[0]-1)<<1);
|
|
#ifdef USE_DEBUGGER
|
|
last_iram = (ssp->mem.bank.RAM1[0]-1)<<1;
|
|
#endif
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* just in case */
|
|
if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i (%c) with only addr set @ %04x",
|
|
reg, write ? 'w' : 'r', GET_PPC_OFFS());
|
|
#endif
|
|
ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
|
|
}
|
|
|
|
if (reg == 4 || (rST & 0x60))
|
|
{
|
|
#ifdef LOG_SVP
|
|
#define CADDR ((((mode<<16)&0x7f0000)|addr)<<1)
|
|
#endif
|
|
unsigned short *dram = (unsigned short *)svp->dram;
|
|
if (write)
|
|
{
|
|
/*int mode = ssp->pmac_write[reg]&0xffff;
|
|
int addr = ssp->pmac_write[reg]>>16;*/
|
|
int addr = ssp->pmac[1][reg]&0xffff;
|
|
int mode = ssp->pmac[1][reg]>>16;
|
|
#ifdef LOG_SVP
|
|
if ((mode & 0xb800) == 0xb800)
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: mode %04x", mode);
|
|
#endif
|
|
if ((mode & 0x43ff) == 0x0018) /* DRAM */
|
|
{
|
|
int inc = get_inc(mode);
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (inc %i, ovrw %i)",
|
|
reg, CADDR, d, inc >> 16, (mode>>10)&1);
|
|
#endif
|
|
if (mode & 0x0400) {
|
|
overwite_write(dram[addr], d);
|
|
} else dram[addr] = d;
|
|
ssp->pmac[1][reg] += inc;
|
|
}
|
|
else if ((mode & 0xfbff) == 0x4018) /* DRAM, cell inc */
|
|
{
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "ssp PM%i DRAM w [%06x] %04x (cell inc, ovrw %i) @ %04x",
|
|
reg, CADDR, d, (mode>>10)&1, GET_PPC_OFFS());
|
|
#endif
|
|
if (mode & 0x0400) {
|
|
overwite_write(dram[addr], d);
|
|
} else dram[addr] = d;
|
|
/* ssp->pmac_write[reg] += (addr&1) ? (31<<16) : (1<<16); */
|
|
ssp->pmac[1][reg] += (addr&1) ? 31 : 1;
|
|
}
|
|
else if ((mode & 0x47ff) == 0x001c) /* IRAM */
|
|
{
|
|
int inc = get_inc(mode);
|
|
#ifdef LOG_SVP
|
|
if ((addr&0xfc00) != 0x8000)
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid IRAM addr: %04x", addr<<1);
|
|
elprintf(EL_SVP, "ssp IRAM w [%06x] %04x (inc %i)", (addr<<1)&0x7ff, d, inc >> 16);
|
|
#endif
|
|
((unsigned short *)svp->iram_rom)[addr&0x3ff] = d;
|
|
ssp->pmac[1][reg] += inc;
|
|
}
|
|
#ifdef LOG_SVP
|
|
else
|
|
{
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled write mode %04x, [%06x] %04x @ %04x",
|
|
reg, mode, CADDR, d, GET_PPC_OFFS());
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/*int mode = ssp->pmac_read[reg]&0xffff;
|
|
int addr = ssp->pmac_read[reg]>>16;*/
|
|
int addr = ssp->pmac[0][reg]&0xffff;
|
|
int mode = ssp->pmac[0][reg]>>16;
|
|
|
|
if ((mode & 0xfff0) == 0x0800) /* ROM, inc 1, verified to be correct */
|
|
{
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "ssp ROM r [%06x] %04x", CADDR,
|
|
((unsigned short *)cart.rom)[addr|((mode&0xf)<<16)]);
|
|
#endif
|
|
/*if ((signed int)ssp->pmac_read[reg] >> 16 == -1) ssp->pmac_read[reg]++;
|
|
ssp->pmac_read[reg] += 1<<16;*/
|
|
if ((signed int)(ssp->pmac[0][reg] & 0xffff) == -1) ssp->pmac[0][reg] += 1<<16;
|
|
ssp->pmac[0][reg] ++;
|
|
|
|
d = ((unsigned short *)cart.rom)[addr|((mode&0xf)<<16)];
|
|
}
|
|
else if ((mode & 0x47ff) == 0x0018) /* DRAM */
|
|
{
|
|
int inc = get_inc(mode);
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "ssp PM%i DRAM r [%06x] %04x (inc %i)", reg, CADDR, dram[addr], inc >> 16);
|
|
#endif
|
|
d = dram[addr];
|
|
ssp->pmac[0][reg] += inc;
|
|
}
|
|
else
|
|
{
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: PM%i unhandled read mode %04x, [%06x] @ %04x",
|
|
reg, mode, CADDR, GET_PPC_OFFS());
|
|
#endif
|
|
d = 0;
|
|
}
|
|
}
|
|
|
|
/* PMC value corresponds to last PMR accessed (not sure). */
|
|
rPMC.v = ssp->pmac[write][reg];
|
|
|
|
return d;
|
|
}
|
|
|
|
return (u32)-1;
|
|
}
|
|
|
|
/* 8 */
|
|
static u32 read_PM0(void)
|
|
{
|
|
u32 d = pm_io(0, 0, 0);
|
|
if (d != (u32)-1) return d;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PPC_OFFS());
|
|
#endif
|
|
d = rPM0;
|
|
if (!(d & 2) && (GET_PPC_OFFS() == 0x800 || GET_PPC_OFFS() == 0x1851E)) {
|
|
ssp->emu_status |= SSP_WAIT_PM0;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "det TIGHT loop: PM0");
|
|
#endif
|
|
}
|
|
rPM0 &= ~2; /* ? */
|
|
return d;
|
|
}
|
|
|
|
static void write_PM0(u32 d)
|
|
{
|
|
u32 r = pm_io(0, 1, d);
|
|
if (r != (u32)-1) return;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PPC_OFFS());
|
|
#endif
|
|
rPM0 = d;
|
|
}
|
|
|
|
/* 9 */
|
|
static u32 read_PM1(void)
|
|
{
|
|
u32 d = pm_io(1, 0, 0);
|
|
if (d != (u32)-1) return d;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM1 raw r %04x @ %04x", rPM1, GET_PPC_OFFS());
|
|
#endif
|
|
return rPM1;
|
|
}
|
|
|
|
static void write_PM1(u32 d)
|
|
{
|
|
u32 r = pm_io(1, 1, d);
|
|
if (r != (u32)-1) return;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM1 raw w %04x @ %04x", d, GET_PPC_OFFS());
|
|
#endif
|
|
rPM1 = d;
|
|
}
|
|
|
|
/* 10 */
|
|
static u32 read_PM2(void)
|
|
{
|
|
u32 d = pm_io(2, 0, 0);
|
|
if (d != (u32)-1) return d;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM2 raw r %04x @ %04x", rPM2, GET_PPC_OFFS());
|
|
#endif
|
|
return rPM2;
|
|
}
|
|
|
|
static void write_PM2(u32 d)
|
|
{
|
|
u32 r = pm_io(2, 1, d);
|
|
if (r != (u32)-1) return;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM2 raw w %04x @ %04x", d, GET_PPC_OFFS());
|
|
#endif
|
|
rPM2 = d;
|
|
}
|
|
|
|
/* 11 */
|
|
static u32 read_XST(void)
|
|
{
|
|
/* can be removed? */
|
|
u32 d = pm_io(3, 0, 0);
|
|
if (d != (u32)-1) return d;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PPC_OFFS());
|
|
#endif
|
|
return rXST;
|
|
}
|
|
|
|
static void write_XST(u32 d)
|
|
{
|
|
/* can be removed? */
|
|
u32 r = pm_io(3, 1, d);
|
|
if (r != (u32)-1) return;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PPC_OFFS());
|
|
#endif
|
|
rPM0 |= 1;
|
|
rXST = d;
|
|
}
|
|
|
|
/* 12 */
|
|
static u32 read_PM4(void)
|
|
{
|
|
u32 d = pm_io(4, 0, 0);
|
|
if (d == 0) {
|
|
switch (GET_PPC_OFFS()) {
|
|
case 0x0854:
|
|
ssp->emu_status |= SSP_WAIT_30FE08;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "det TIGHT loop: [30fe08]");
|
|
#endif
|
|
break;
|
|
case 0x4f12:
|
|
ssp->emu_status |= SSP_WAIT_30FE06;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "det TIGHT loop: [30fe06]");
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
if (d != (u32)-1) return d;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM4 raw r %04x @ %04x", rPM4, GET_PPC_OFFS());
|
|
#endif
|
|
return rPM4;
|
|
}
|
|
|
|
static void write_PM4(u32 d)
|
|
{
|
|
u32 r = pm_io(4, 1, d);
|
|
if (r != (u32)-1) return;
|
|
/* can be removed? */
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "PM4 raw w %04x @ %04x", d, GET_PPC_OFFS());
|
|
#endif
|
|
rPM4 = d;
|
|
}
|
|
|
|
/* 14 */
|
|
static u32 read_PMC(void)
|
|
{
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PMC r a %04x (st %c) @ %04x", rPMC.byte.h,
|
|
(ssp->emu_status & SSP_PMC_HAVE_ADDR) ? 'm' : 'a', GET_PPC_OFFS());
|
|
#endif
|
|
if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
|
|
/* if (ssp->emu_status & SSP_PMC_SET) */
|
|
/* elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS()); */
|
|
ssp->emu_status |= SSP_PMC_SET;
|
|
ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
|
|
/* return ((rPMC.h << 4) & 0xfff0) | ((rPMC.h >> 4) & 0xf); */
|
|
return ((rPMC.byte.l << 4) & 0xfff0) | ((rPMC.byte.l >> 4) & 0xf);
|
|
} else {
|
|
ssp->emu_status |= SSP_PMC_HAVE_ADDR;
|
|
/* return rPMC.h; */
|
|
return rPMC.byte.l;
|
|
}
|
|
}
|
|
|
|
static void write_PMC(u32 d)
|
|
{
|
|
if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
|
|
/* if (ssp->emu_status & SSP_PMC_SET) */
|
|
/* elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS()); */
|
|
ssp->emu_status |= SSP_PMC_SET;
|
|
ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
|
|
/* rPMC.l = d; */
|
|
rPMC.byte.h = d;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PMC w m %04x @ %04x", rPMC.byte.l, GET_PPC_OFFS());
|
|
#endif
|
|
} else {
|
|
ssp->emu_status |= SSP_PMC_HAVE_ADDR;
|
|
/* rPMC.h = d; */
|
|
rPMC.byte.l = d;
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "PMC w a %04x @ %04x", rPMC.byte.h, GET_PPC_OFFS());
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* 15 */
|
|
static u32 read_AL(void)
|
|
{
|
|
if (*(PC-1) == 0x000f) {
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP, "ssp dummy PM assign %08x @ %04x", rPMC.v, GET_PPC_OFFS());
|
|
#endif
|
|
ssp->emu_status &= ~(SSP_PMC_SET|SSP_PMC_HAVE_ADDR); /* ? */
|
|
}
|
|
return rAL;
|
|
}
|
|
|
|
static void write_AL(u32 d)
|
|
{
|
|
rAL = d;
|
|
}
|
|
|
|
|
|
typedef u32 (*read_func_t)(void);
|
|
typedef void (*write_func_t)(u32 d);
|
|
|
|
static read_func_t read_handlers[16] =
|
|
{
|
|
read_unknown, read_unknown, read_unknown, read_unknown, /* -, X, Y, A */
|
|
read_unknown, /* 4 ST */
|
|
read_STACK,
|
|
read_PC,
|
|
read_P,
|
|
read_PM0, /* 8 */
|
|
read_PM1,
|
|
read_PM2,
|
|
read_XST,
|
|
read_PM4, /* 12 */
|
|
read_unknown, /* 13 gr13 */
|
|
read_PMC,
|
|
read_AL
|
|
};
|
|
|
|
static write_func_t write_handlers[16] =
|
|
{
|
|
write_unknown, write_unknown, write_unknown, write_unknown, /* -, X, Y, A */
|
|
/* write_unknown, */ /* 4 ST */
|
|
write_ST, /* 4 ST (debug hook) */
|
|
write_STACK,
|
|
write_PC,
|
|
write_unknown, /* 7 P */
|
|
write_PM0, /* 8 */
|
|
write_PM1,
|
|
write_PM2,
|
|
write_XST,
|
|
write_PM4, /* 12 */
|
|
write_unknown, /* 13 gr13 */
|
|
write_PMC,
|
|
write_AL
|
|
};
|
|
|
|
/* ----------------------------------------------------- */
|
|
/* pointer register handlers */
|
|
|
|
#define ptr1_read(op) ptr1_read_(op&3,(op>>6)&4,(op<<1)&0x18)
|
|
|
|
static u32 ptr1_read_(int ri, int isj2, int modi3)
|
|
{
|
|
/* int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18); */
|
|
u32 mask, add = 0, t = ri | isj2 | modi3;
|
|
unsigned char *rp = NULL;
|
|
switch (t)
|
|
{
|
|
/* mod=0 (00) */
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02: return ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]];
|
|
case 0x03: return ssp->mem.bank.RAM0[0];
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06: return ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]];
|
|
case 0x07: return ssp->mem.bank.RAM1[0];
|
|
/* mod=1 (01), "+!" */
|
|
case 0x08:
|
|
case 0x09:
|
|
case 0x0a: return ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]++];
|
|
case 0x0b: return ssp->mem.bank.RAM0[1];
|
|
case 0x0c:
|
|
case 0x0d:
|
|
case 0x0e: return ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]++];
|
|
case 0x0f: return ssp->mem.bank.RAM1[1];
|
|
/* mod=2 (10), "-" */
|
|
case 0x10:
|
|
case 0x11:
|
|
case 0x12: rp = &ssp->ptr.bank.r0[t&3]; t = ssp->mem.bank.RAM0[*rp];
|
|
if (!(rST&7)) { (*rp)--; return t; }
|
|
add = -1; goto modulo;
|
|
case 0x13: return ssp->mem.bank.RAM0[2];
|
|
case 0x14:
|
|
case 0x15:
|
|
case 0x16: rp = &ssp->ptr.bank.r1[t&3]; t = ssp->mem.bank.RAM1[*rp];
|
|
if (!(rST&7)) { (*rp)--; return t; }
|
|
add = -1; goto modulo;
|
|
case 0x17: return ssp->mem.bank.RAM1[2];
|
|
/* mod=3 (11), "+" */
|
|
case 0x18:
|
|
case 0x19:
|
|
case 0x1a: rp = &ssp->ptr.bank.r0[t&3]; t = ssp->mem.bank.RAM0[*rp];
|
|
if (!(rST&7)) { (*rp)++; return t; }
|
|
add = 1; goto modulo;
|
|
case 0x1b: return ssp->mem.bank.RAM0[3];
|
|
case 0x1c:
|
|
case 0x1d:
|
|
case 0x1e: rp = &ssp->ptr.bank.r1[t&3]; t = ssp->mem.bank.RAM1[*rp];
|
|
if (!(rST&7)) { (*rp)++; return t; }
|
|
add = 1; goto modulo;
|
|
case 0x1f: return ssp->mem.bank.RAM1[3];
|
|
}
|
|
|
|
return 0;
|
|
|
|
modulo:
|
|
mask = (1 << (rST&7)) - 1;
|
|
*rp = (*rp & ~mask) | ((*rp + add) & mask);
|
|
return t;
|
|
}
|
|
|
|
static void ptr1_write(int op, u32 d)
|
|
{
|
|
int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
|
|
switch (t)
|
|
{
|
|
/* mod=0 (00) */
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02: ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]] = d; return;
|
|
case 0x03: ssp->mem.bank.RAM0[0] = d; return;
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06: ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]] = d; return;
|
|
case 0x07: ssp->mem.bank.RAM1[0] = d; return;
|
|
/* mod=1 (01), "+!" */
|
|
/* mod=3, "+" */
|
|
case 0x08:
|
|
case 0x18:
|
|
case 0x09:
|
|
case 0x19:
|
|
case 0x0a:
|
|
case 0x1a: ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]++] = d; return;
|
|
case 0x0b: ssp->mem.bank.RAM0[1] = d; return;
|
|
case 0x0c:
|
|
case 0x1c:
|
|
case 0x0d:
|
|
case 0x1d:
|
|
case 0x0e:
|
|
case 0x1e: ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]++] = d; return;
|
|
case 0x0f: ssp->mem.bank.RAM1[1] = d; return;
|
|
/* mod=2 (10), "-" */
|
|
case 0x10:
|
|
case 0x11:
|
|
case 0x12: ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]--] = d; return;
|
|
case 0x13: ssp->mem.bank.RAM0[2] = d; return;
|
|
case 0x14:
|
|
case 0x15:
|
|
case 0x16: ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]--] = d; return;
|
|
case 0x17: ssp->mem.bank.RAM1[2] = d; return;
|
|
/* mod=3 (11) */
|
|
case 0x1b: ssp->mem.bank.RAM0[3] = d; return;
|
|
case 0x1f: ssp->mem.bank.RAM1[3] = d; return;
|
|
}
|
|
}
|
|
|
|
static u32 ptr2_read(int op)
|
|
{
|
|
int mv = 0, t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
|
|
switch (t)
|
|
{
|
|
/* mod=0 (00) */
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02: mv = ssp->mem.bank.RAM0[ssp->ptr.bank.r0[t&3]]++; break;
|
|
case 0x03: mv = ssp->mem.bank.RAM0[0]++; break;
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06: mv = ssp->mem.bank.RAM1[ssp->ptr.bank.r1[t&3]]++; break;
|
|
case 0x07: mv = ssp->mem.bank.RAM1[0]++; break;
|
|
/* mod=1 (01) */
|
|
case 0x0b: mv = ssp->mem.bank.RAM0[1]++; break;
|
|
case 0x0f: mv = ssp->mem.bank.RAM1[1]++; break;
|
|
/* mod=2 (10) */
|
|
case 0x13: mv = ssp->mem.bank.RAM0[2]++; break;
|
|
case 0x17: mv = ssp->mem.bank.RAM1[2]++; break;
|
|
/* mod=3 (11) */
|
|
case 0x1b: mv = ssp->mem.bank.RAM0[3]++; break;
|
|
case 0x1f: mv = ssp->mem.bank.RAM1[3]++; break;
|
|
default:
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: invalid mod in ((rX))? @ %04x", GET_PPC_OFFS());
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
return ((unsigned short *)svp->iram_rom)[mv];
|
|
}
|
|
|
|
|
|
/* ----------------------------------------------------- */
|
|
|
|
void ssp1601_reset(ssp1601_t *l_ssp)
|
|
{
|
|
ssp = l_ssp;
|
|
ssp->emu_status = 0;
|
|
ssp->gr[SSP_GR0].v = 0xffff0000;
|
|
rPC = 0x400;
|
|
rSTACK = 0; /* ? using ascending stack */
|
|
rST = 0;
|
|
}
|
|
|
|
|
|
#ifdef USE_DEBUGGER
|
|
static void debug_dump(void)
|
|
{
|
|
printf("GR0: %04x X: %04x Y: %04x A: %08x\n", ssp->gr[SSP_GR0].byte.h, rX, rY, ssp->gr[SSP_A].v);
|
|
printf("PC: %04x (%04x) P: %08x\n", GET_PC(), GET_PC() << 1, ssp->gr[SSP_P].v);
|
|
printf("PM0: %04x PM1: %04x PM2: %04x\n", rPM0, rPM1, rPM2);
|
|
printf("XST: %04x PM4: %04x PMC: %08x\n", rXST, rPM4, ssp->gr[SSP_PMC].v);
|
|
printf(" ST: %04x %c%c%c%c, GP0_0 %i, GP0_1 %i\n", rST, rST&SSP_FLAG_N?'N':'n', rST&SSP_FLAG_V?'V':'v',
|
|
rST&SSP_FLAG_Z?'Z':'z', rST&SSP_FLAG_L?'L':'l', (rST>>5)&1, (rST>>6)&1);
|
|
printf("STACK: %i %04x %04x %04x %04x %04x %04x\n", rSTACK, ssp->stack[0], ssp->stack[1],
|
|
ssp->stack[2], ssp->stack[3], ssp->stack[4], ssp->stack[5]);
|
|
printf("r0-r2: %02x %02x %02x r4-r6: %02x %02x %02x\n", rIJ[0], rIJ[1], rIJ[2], rIJ[4], rIJ[5], rIJ[6]);
|
|
elprintf(EL_SVP, "cycles: %i, emu_status: %x", g_cycles, ssp->emu_status);
|
|
}
|
|
|
|
static void debug_dump_mem(void)
|
|
{
|
|
int h, i;
|
|
printf("RAM0\n");
|
|
for (h = 0; h < 32; h++)
|
|
{
|
|
if (h == 16) printf("RAM1\n");
|
|
printf("%03x:", h*16);
|
|
for (i = 0; i < 16; i++)
|
|
printf(" %04x", ssp->mem.RAM[h*16+i]);
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
static void debug_dump2file(const char *fname, void *mem, int len)
|
|
{
|
|
FILE *f = fopen(fname, "wb");
|
|
unsigned short *p = mem;
|
|
int i;
|
|
if (f) {
|
|
for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
|
|
fwrite(mem, 1, len, f);
|
|
fclose(f);
|
|
for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8);
|
|
printf("dumped to %s\n", fname);
|
|
}
|
|
else
|
|
printf("dump failed\n");
|
|
}
|
|
|
|
static int bpts[10] = { 0, };
|
|
|
|
static void debug(unsigned int pc, unsigned int op)
|
|
{
|
|
static char buffo[64] = {0,};
|
|
char buff[64] = {0,};
|
|
int i;
|
|
|
|
if (running) {
|
|
for (i = 0; i < 10; i++)
|
|
if (pc != 0 && bpts[i] == pc) {
|
|
printf("breakpoint %i\n", i);
|
|
running = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (running) return;
|
|
|
|
printf("%04x (%02x) @ %04x\n", op, op >> 9, pc<<1);
|
|
|
|
while (1)
|
|
{
|
|
printf("dbg> ");
|
|
fflush(stdout);
|
|
fgets(buff, sizeof(buff), stdin);
|
|
if (buff[0] == '\n') strcpy(buff, buffo);
|
|
else strcpy(buffo, buff);
|
|
|
|
switch (buff[0]) {
|
|
case 0: exit(0);
|
|
case 'c':
|
|
case 'r': running = 1; return;
|
|
case 's':
|
|
case 'n': return;
|
|
case 'x': debug_dump(); break;
|
|
case 'm': debug_dump_mem(); break;
|
|
case 'b': {
|
|
char *baddr = buff + 2;
|
|
i = 0;
|
|
if (buff[3] == ' ') { i = buff[2] - '0'; baddr = buff + 4; }
|
|
bpts[i] = strtol(baddr, NULL, 16) >> 1;
|
|
printf("breakpoint %i set @ %04x\n", i, bpts[i]<<1);
|
|
break;
|
|
}
|
|
case 'd':
|
|
sprintf(buff, "iramrom_%04x.bin", last_iram);
|
|
debug_dump2file(buff, svp->iram_rom, sizeof(svp->iram_rom));
|
|
debug_dump2file("dram.bin", svp->dram, sizeof(svp->dram));
|
|
break;
|
|
default: printf("unknown command\n"); break;
|
|
}
|
|
}
|
|
}
|
|
#endif /* USE_DEBUGGER */
|
|
|
|
|
|
void ssp1601_run(int cycles)
|
|
{
|
|
SET_PC(rPC);
|
|
g_cycles = cycles;
|
|
|
|
do
|
|
{
|
|
int op;
|
|
u32 tmpv;
|
|
|
|
op = *PC++;
|
|
#ifdef USE_DEBUGGER
|
|
debug(GET_PC()-1, op);
|
|
#endif
|
|
switch (op >> 9)
|
|
{
|
|
/* ld d, s */
|
|
case 0x00:
|
|
if (op == 0) break; /* nop */
|
|
if (op == ((SSP_A<<4)|SSP_P)) { /* A <- P */
|
|
/* not sure. MAME claims that only hi word is transfered. */
|
|
read_P(); /* update P */
|
|
rA32 = rP.v;
|
|
}
|
|
else
|
|
{
|
|
tmpv = REG_READ(op & 0x0f);
|
|
REG_WRITE((op & 0xf0) >> 4, tmpv);
|
|
}
|
|
break;
|
|
|
|
/* ld d, (ri) */
|
|
case 0x01: tmpv = ptr1_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
|
|
|
|
/* ld (ri), s */
|
|
case 0x02: tmpv = REG_READ((op & 0xf0) >> 4); ptr1_write(op, tmpv); break;
|
|
|
|
/* ldi d, imm */
|
|
case 0x04: tmpv = *PC++; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
|
|
|
|
/* ld d, ((ri)) */
|
|
case 0x05: tmpv = ptr2_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
|
|
|
|
/* ldi (ri), imm */
|
|
case 0x06: tmpv = *PC++; ptr1_write(op, tmpv); break;
|
|
|
|
/* ld adr, a */
|
|
case 0x07: ssp->mem.RAM[op & 0x1ff] = rA; break;
|
|
|
|
/* ld d, ri */
|
|
case 0x09: tmpv = rIJ[(op&3)|((op>>6)&4)]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
|
|
|
|
/* ld ri, s */
|
|
case 0x0a: rIJ[(op&3)|((op>>6)&4)] = REG_READ((op & 0xf0) >> 4); break;
|
|
|
|
/* ldi ri, simm */
|
|
case 0x0c:
|
|
case 0x0d:
|
|
case 0x0e:
|
|
case 0x0f: rIJ[(op>>8)&7] = op; break;
|
|
|
|
/* call cond, addr */
|
|
case 0x24: {
|
|
int cond = 0;
|
|
COND_CHECK
|
|
if (cond) { int new_PC = *PC++; write_STACK(GET_PC()); write_PC(new_PC); }
|
|
else PC++;
|
|
break;
|
|
}
|
|
|
|
/* ld d, (a) */
|
|
case 0x25: tmpv = ((unsigned short *)svp->iram_rom)[rA]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
|
|
|
|
/* bra cond, addr */
|
|
case 0x26: {
|
|
int cond = 0;
|
|
COND_CHECK
|
|
if (cond) { int new_PC = *PC++; write_PC(new_PC); }
|
|
else PC++;
|
|
break;
|
|
}
|
|
|
|
/* mod cond, op */
|
|
case 0x48: {
|
|
int cond = 0;
|
|
COND_CHECK
|
|
if (cond) {
|
|
switch (op & 7) {
|
|
case 2: rA32 = (signed int)rA32 >> 1; break; /* shr (arithmetic) */
|
|
case 3: rA32 <<= 1; break; /* shl */
|
|
case 6: rA32 = -(signed int)rA32; break; /* neg */
|
|
case 7: if ((int)rA32 < 0) rA32 = -(signed int)rA32; break; /* abs */
|
|
default:
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: unhandled mod %i @ %04x",
|
|
op&7, GET_PPC_OFFS());
|
|
#endif
|
|
break;
|
|
}
|
|
UPD_ACC_ZN /* ? */
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* mpys? */
|
|
case 0x1b:
|
|
#ifdef LOG_SVP
|
|
if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS());
|
|
#endif
|
|
read_P(); /* update P */
|
|
rA32 -= rP.v; /* maybe only upper word? */
|
|
UPD_ACC_ZN /* there checking flags after this */
|
|
rX = ptr1_read_(op&3, 0, (op<<1)&0x18); /* ri (maybe rj?) */
|
|
rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); /* rj */
|
|
break;
|
|
|
|
/* mpya (rj), (ri), b */
|
|
case 0x4b:
|
|
#ifdef LOG_SVP
|
|
if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS());
|
|
#endif
|
|
read_P(); /* update P */
|
|
rA32 += rP.v; /* confirmed to be 32bit */
|
|
UPD_ACC_ZN /* ? */
|
|
rX = ptr1_read_(op&3, 0, (op<<1)&0x18); /* ri (maybe rj?) */
|
|
rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); /* rj */
|
|
break;
|
|
|
|
/* mld (rj), (ri), b */
|
|
case 0x5b:
|
|
#ifdef LOG_SVP
|
|
if (!(op&0x100)) elprintf(EL_SVP|EL_ANOMALY, "ssp FIXME: no b bit @ %04x", GET_PPC_OFFS());
|
|
#endif
|
|
rA32 = 0;
|
|
rST &= 0x0fff; /* ? */
|
|
rX = ptr1_read_(op&3, 0, (op<<1)&0x18); /* ri (maybe rj?) */
|
|
rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); /* rj */
|
|
break;
|
|
|
|
/* OP a, s */
|
|
case 0x10: OP_CHECK32(OP_SUBA32); tmpv = REG_READ(op & 0x0f); OP_SUBA(tmpv); break;
|
|
case 0x30: OP_CHECK32(OP_CMPA32); tmpv = REG_READ(op & 0x0f); OP_CMPA(tmpv); break;
|
|
case 0x40: OP_CHECK32(OP_ADDA32); tmpv = REG_READ(op & 0x0f); OP_ADDA(tmpv); break;
|
|
case 0x50: OP_CHECK32(OP_ANDA32); tmpv = REG_READ(op & 0x0f); OP_ANDA(tmpv); break;
|
|
case 0x60: OP_CHECK32(OP_ORA32 ); tmpv = REG_READ(op & 0x0f); OP_ORA (tmpv); break;
|
|
case 0x70: OP_CHECK32(OP_EORA32); tmpv = REG_READ(op & 0x0f); OP_EORA(tmpv); break;
|
|
|
|
/* OP a, (ri) */
|
|
case 0x11: tmpv = ptr1_read(op); OP_SUBA(tmpv); break;
|
|
case 0x31: tmpv = ptr1_read(op); OP_CMPA(tmpv); break;
|
|
case 0x41: tmpv = ptr1_read(op); OP_ADDA(tmpv); break;
|
|
case 0x51: tmpv = ptr1_read(op); OP_ANDA(tmpv); break;
|
|
case 0x61: tmpv = ptr1_read(op); OP_ORA (tmpv); break;
|
|
case 0x71: tmpv = ptr1_read(op); OP_EORA(tmpv); break;
|
|
|
|
/* OP a, adr */
|
|
case 0x03: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_LDA (tmpv); break;
|
|
case 0x13: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_SUBA(tmpv); break;
|
|
case 0x33: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_CMPA(tmpv); break;
|
|
case 0x43: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_ADDA(tmpv); break;
|
|
case 0x53: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_ANDA(tmpv); break;
|
|
case 0x63: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_ORA (tmpv); break;
|
|
case 0x73: tmpv = ssp->mem.RAM[op & 0x1ff]; OP_EORA(tmpv); break;
|
|
|
|
/* OP a, imm */
|
|
case 0x14: tmpv = *PC++; OP_SUBA(tmpv); break;
|
|
case 0x34: tmpv = *PC++; OP_CMPA(tmpv); break;
|
|
case 0x44: tmpv = *PC++; OP_ADDA(tmpv); break;
|
|
case 0x54: tmpv = *PC++; OP_ANDA(tmpv); break;
|
|
case 0x64: tmpv = *PC++; OP_ORA (tmpv); break;
|
|
case 0x74: tmpv = *PC++; OP_EORA(tmpv); break;
|
|
|
|
/* OP a, ((ri)) */
|
|
case 0x15: tmpv = ptr2_read(op); OP_SUBA(tmpv); break;
|
|
case 0x35: tmpv = ptr2_read(op); OP_CMPA(tmpv); break;
|
|
case 0x45: tmpv = ptr2_read(op); OP_ADDA(tmpv); break;
|
|
case 0x55: tmpv = ptr2_read(op); OP_ANDA(tmpv); break;
|
|
case 0x65: tmpv = ptr2_read(op); OP_ORA (tmpv); break;
|
|
case 0x75: tmpv = ptr2_read(op); OP_EORA(tmpv); break;
|
|
|
|
/* OP a, ri */
|
|
case 0x19: tmpv = rIJ[IJind]; OP_SUBA(tmpv); break;
|
|
case 0x39: tmpv = rIJ[IJind]; OP_CMPA(tmpv); break;
|
|
case 0x49: tmpv = rIJ[IJind]; OP_ADDA(tmpv); break;
|
|
case 0x59: tmpv = rIJ[IJind]; OP_ANDA(tmpv); break;
|
|
case 0x69: tmpv = rIJ[IJind]; OP_ORA (tmpv); break;
|
|
case 0x79: tmpv = rIJ[IJind]; OP_EORA(tmpv); break;
|
|
|
|
/* OP simm */
|
|
case 0x1c:
|
|
OP_SUBA(op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
case 0x3c:
|
|
OP_CMPA(op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
case 0x4c:
|
|
OP_ADDA(op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
/* MAME code only does LSB of top word, but this looks wrong to me. */
|
|
case 0x5c:
|
|
OP_ANDA(op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
case 0x6c:
|
|
OP_ORA (op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
case 0x7c:
|
|
OP_EORA(op & 0xff);
|
|
#ifdef LOG_SVP
|
|
if (op&0x100) elprintf(EL_SVP|EL_ANOMALY, "FIXME: simm with upper bit set");
|
|
#endif
|
|
break;
|
|
|
|
default:
|
|
#ifdef LOG_SVP
|
|
elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME unhandled op %04x @ %04x", op, GET_PPC_OFFS());
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
while (--g_cycles > 0 && !(ssp->emu_status & SSP_WAIT_MASK));
|
|
|
|
read_P(); /* update P */
|
|
rPC = GET_PC();
|
|
|
|
#ifdef LOG_SVP
|
|
if (ssp->gr[SSP_GR0].v != 0xffff0000)
|
|
elprintf(EL_ANOMALY|EL_SVP, "ssp FIXME: REG 0 corruption! %08x", ssp->gr[SSP_GR0].v);
|
|
#endif
|
|
}
|
|
|