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picodrive/pico/carthw/svp/stub_arm.S
notaz cff531af94 clarify PicoDrive's license 
- PicoDrive was originally released by fDave with simple
  "free for non-commercial use / For commercial use, separate licencing
  terms must be obtained" license and I kept it in my releases.
- in 2011, fDave re-released his code (same that I used as base
  many years ago) dual licensed with GPLv2 and MAME licenses:
    https://code.google.com/p/cyclone68000/

Based on the above I now proclaim that the whole source code is licensed
under the MAME license as more elaborate form of "for non-commercial use".
If that raises any doubt, I announce that all my modifications (which
is the vast majority of code by now) is licensed under the MAME license,
as it reads in COPYING file in this commit.

This does not affect ym2612.c/sn76496.c that were MAME licensed already
from the beginning.
2013-06-26 03:07:07 +03:00

619 lines
15 KiB
ArmAsm
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@*
@* Compiler helper functions and some SVP HLE code
@* (C) notaz, 2008,2009
@*
@* This work is licensed under the terms of MAME license.
@* See COPYING file in the top-level directory.
@*
.global ssp_drc_entry
.global ssp_drc_next
.global ssp_drc_next_patch
.global ssp_drc_end
.global ssp_hle_800
.global ssp_hle_902
.global ssp_hle_07_030
.global ssp_hle_07_036
.global ssp_hle_07_6d6
.global ssp_hle_11_12c
.global ssp_hle_11_384
.global ssp_hle_11_38a
.text
.align 2
@ SSP_GR0, SSP_X, SSP_Y, SSP_A,
@ SSP_ST, SSP_STACK, SSP_PC, SSP_P,
@ SSP_PM0, SSP_PM1, SSP_PM2, SSP_XST,
@ SSP_PM4, SSP_gr13, SSP_PMC, SSP_AL
@ register map:
@ r4: XXYY
@ r5: A
@ r6: STACK and emu flags: sss0 * .uu. .lll NZCV (NZCV is PSR bits from ARM)
@ r7: SSP context
@ r8: r0-r2 (.210)
@ r9: r4-r6 (.654)
@ r10: P
@ r11: cycles
@ r12: tmp
#define SSP_OFFS_GR 0x400
#define SSP_PC 6
#define SSP_P 7
#define SSP_PM0 8
#define SSP_PMC 14
#define SSP_OFFS_PM_WRITE 0x46c // pmac_write[]
#define SSP_OFFS_EMUSTAT 0x484 // emu_status
#define SSP_OFFS_IRAM_ROM 0x48c // ptr_iram_rom
#define SSP_OFFS_DRAM 0x490 // ptr_dram
#define SSP_OFFS_IRAM_DIRTY 0x494
#define SSP_OFFS_IRAM_CTX 0x498 // iram_context
#define SSP_OFFS_BLTAB 0x49c // block_table
#define SSP_OFFS_BLTAB_IRAM 0x4a0
#define SSP_OFFS_TMP0 0x4a4 // for entry PC
#define SSP_OFFS_TMP1 0x4a8
#define SSP_OFFS_TMP2 0x4ac
#define SSP_WAIT_PM0 0x2000
.macro ssp_drc_do_next patch_jump=0
.if \patch_jump
str lr, [r7, #SSP_OFFS_TMP2] @ jump instr. (actually call) address + 4
.endif
mov r0, r0, lsl #16
mov r0, r0, lsr #16
str r0, [r7, #SSP_OFFS_TMP0]
cmp r0, #0x400
blt 0f @ ssp_de_iram
ldr r2, [r7, #SSP_OFFS_BLTAB]
ldr r2, [r2, r0, lsl #2]
tst r2, r2
.if \patch_jump
bne ssp_drc_do_patch
.else
bxne r2
.endif
bl ssp_translate_block
mov r2, r0
ldr r0, [r7, #SSP_OFFS_TMP0] @ entry PC
ldr r1, [r7, #SSP_OFFS_BLTAB]
str r2, [r1, r0, lsl #2]
.if \patch_jump
b ssp_drc_do_patch
.else
bx r2
.endif
0: @ ssp_de_iram:
ldr r1, [r7, #SSP_OFFS_IRAM_DIRTY]
tst r1, r1
ldreq r1, [r7, #SSP_OFFS_IRAM_CTX]
beq 1f @ ssp_de_iram_ctx
bl ssp_get_iram_context
mov r1, #0
str r1, [r7, #SSP_OFFS_IRAM_DIRTY]
mov r1, r0
str r1, [r7, #SSP_OFFS_IRAM_CTX]
ldr r0, [r7, #SSP_OFFS_TMP0] @ entry PC
1: @ ssp_de_iram_ctx:
ldr r2, [r7, #SSP_OFFS_BLTAB_IRAM]
add r2, r2, r1, lsl #12 @ block_tab_iram + iram_context * 0x800/2*4
add r1, r2, r0, lsl #2
ldr r2, [r1]
tst r2, r2
.if \patch_jump
bne ssp_drc_do_patch
.else
bxne r2
.endif
str r1, [r7, #SSP_OFFS_TMP1]
bl ssp_translate_block
mov r2, r0
ldr r0, [r7, #SSP_OFFS_TMP0] @ entry PC
ldr r1, [r7, #SSP_OFFS_TMP1] @ &block_table_iram[iram_context][rPC]
str r2, [r1]
.if \patch_jump
b ssp_drc_do_patch
.else
bx r2
.endif
.endm @ ssp_drc_do_next
ssp_drc_entry:
stmfd sp!, {r4-r11, lr}
mov r11, r0
ssp_regfile_load:
ldr r7, =ssp
ldr r7, [r7]
add r2, r7, #0x400
add r2, r2, #4
ldmia r2, {r3,r4,r5,r6,r8}
mov r3, r3, lsr #16
mov r3, r3, lsl #16
orr r4, r3, r4, lsr #16 @ XXYY
and r8, r8, #0x0f0000
mov r8, r8, lsl #13 @ sss0 *
and r9, r6, #0x670000
tst r6, #0x80000000
orrne r8, r8, #0x8
tst r6, #0x20000000
orrne r8, r8, #0x4 @ sss0 * NZ..
orr r6, r8, r9, lsr #12 @ sss0 * .uu. .lll NZ..
ldr r8, [r7, #0x440] @ r0-r2
ldr r9, [r7, #0x444] @ r4-r6
ldr r10,[r7, #(0x400+SSP_P*4)] @ P
ldr r0, [r7, #(SSP_OFFS_GR+SSP_PC*4)]
mov r0, r0, lsr #16
ssp_drc_next:
ssp_drc_do_next 0
ssp_drc_next_patch:
ssp_drc_do_next 1
ssp_drc_do_patch:
ldr r1, [r7, #SSP_OFFS_TMP2] @ jump instr. (actually call) address + 4
subs r12,r2, r1
moveq r3, #0xe1000000
orreq r3, r3, #0x00a00000 @ nop
streq r3, [r1, #-4]
beq ssp_drc_dp_end
cmp r12,#4
ldreq r3, [r1]
addeq r3, r3, #1
streq r3, [r1, #-4] @ move the other cond up
moveq r3, #0xe1000000
orreq r3, r3, #0x00a00000
streq r3, [r1] @ fill it's place with nop
beq ssp_drc_dp_end
ldr r3, [r1, #-4]
sub r12,r12,#4
mov r3, r3, lsr #24
bic r3, r3, #1 @ L bit
orr r3, r3, r12,lsl #6
mov r3, r3, ror #8 @ patched branch instruction
str r3, [r1, #-4] @ patch the bl/b to jump directly to another handler
ssp_drc_dp_end:
str r2, [r7, #SSP_OFFS_TMP1]
sub r0, r1, #4
add r1, r1, #4
bl cache_flush_d_inval_i
ldr r2, [r7, #SSP_OFFS_TMP1]
ldr r0, [r7, #SSP_OFFS_TMP0]
bx r2
ssp_drc_end:
mov r0, r0, lsl #16
str r0, [r7, #(SSP_OFFS_GR+SSP_PC*4)]
ssp_regfile_store:
str r10,[r7, #(0x400+SSP_P*4)] @ P
str r8, [r7, #0x440] @ r0-r2
str r9, [r7, #0x444] @ r4-r6
mov r9, r6, lsr #13
and r9, r9, #(7<<16) @ STACK
mov r3, r6, lsl #28
msr cpsr_flg, r3 @ to to ARM PSR
and r6, r6, #0x670
mov r6, r6, lsl #12
orrmi r6, r6, #0x80000000 @ N
orreq r6, r6, #0x20000000 @ Z
mov r3, r4, lsl #16 @ Y
mov r2, r4, lsr #16
mov r2, r2, lsl #16 @ X
add r8, r7, #0x400
add r8, r8, #4
stmia r8, {r2,r3,r5,r6,r9}
mov r0, r11
ldmfd sp!, {r4-r11, lr}
bx lr
@ ld A, PM0
@ andi 2
@ bra z=1, gloc_0800
ssp_hle_800:
ldr r0, [r7, #(SSP_OFFS_GR+SSP_PM0*4)]
ldr r1, [r7, #SSP_OFFS_EMUSTAT]
tst r0, #0x20000
orreq r1, r1, #SSP_WAIT_PM0
subeq r11,r11, #1024
streq r1, [r7, #SSP_OFFS_EMUSTAT]
mov r0, #0x400
beq ssp_drc_end
orrne r0, r0, #0x004
b ssp_drc_next
.macro hle_flushflags
bic r6, r6, #0xf
mrs r1, cpsr
orr r6, r6, r1, lsr #28
.endm
.macro hle_popstack
sub r6, r6, #0x20000000
add r1, r7, #0x400
add r1, r1, #0x048 @ stack
add r1, r1, r6, lsr #28
ldrh r0, [r1]
.endm
ssp_hle_902:
cmp r11, #0
ble ssp_drc_end
add r1, r7, #0x200
ldrh r0, [r1]
ldr r3, [r7, #SSP_OFFS_IRAM_ROM]
add r2, r3, r0, lsl #1 @ (r7|00)
ldrh r0, [r2], #2
mov r5, r5, lsl #16
mov r5, r5, lsr #16
bic r0, r0, #0xfc00
add r3, r3, r0, lsl #1 @ IRAM dest
ldrh r12,[r2], #2 @ length
bic r3, r3, #3 @ always seen aligned
@ orr r5, r5, #0x08000000
@ orr r5, r5, #0x00880000
@ sub r5, r5, r12, lsl #16
bic r6, r6, #0xf
add r12,r12,#1
mov r0, #1
str r0, [r7, #SSP_OFFS_IRAM_DIRTY]
sub r11,r11,r12,lsl #1
sub r11,r11,r12 @ -= length*3
ssp_hle_902_loop:
ldrh r0, [r2], #2
ldrh r1, [r2], #2
subs r12,r12,#2
orr r0, r0, r1, lsl #16
str r0, [r3], #4
bgt ssp_hle_902_loop
tst r12, #1
ldrneh r0, [r2], #2
strneh r0, [r3], #2
ldr r0, [r7, #SSP_OFFS_IRAM_ROM]
add r1, r7, #0x200
sub r2, r2, r0
mov r2, r2, lsr #1
strh r2, [r1] @ (r7|00)
sub r0, r3, r0
mov r0, r0, lsr #1
orr r0, r0, #0x08000000
orr r0, r0, #0x001c8000
str r0, [r7, #(SSP_OFFS_GR+SSP_PMC*4)]
str r0, [r7, #(SSP_OFFS_PM_WRITE+4*4)]
hle_popstack
subs r11,r11,#16 @ timeslice is likely to end
ble ssp_drc_end
b ssp_drc_next
@ this one is car rendering related
.macro hle_11_12c_mla offs_in
ldrsh r5, [r7, #(\offs_in+0)]
ldrsh r0, [r7, #(\offs_in+2)]
ldrsh r1, [r7, #(\offs_in+4)]
mul r5, r2, r5
ldrsh r12,[r7, #(\offs_in+6)]
mla r5, r3, r0, r5
mla r5, r4, r1, r5
add r5, r5, r12,lsl #11
movs r5, r5, lsr #13
add r1, r7, r8, lsr #23
strh r5, [r1]
add r8, r8, #(1<<24)
.endm
ssp_hle_11_12c:
cmp r11, #0
ble ssp_drc_end
mov r0, #0
bl ssp_pm_read
mov r4, r0
mov r0, #0
bl ssp_pm_read
mov r5, r0
mov r0, #0
bl ssp_pm_read
mov r2, r4, lsl #16
mov r2, r2, asr #15 @ (r7|00) << 1
mov r3, r5, lsl #16
mov r3, r3, asr #15 @ (r7|01) << 1
mov r4, r0, lsl #16
mov r4, r4, asr #15 @ (r7|10) << 1
bic r8, r8, #0xff
mov r8, r8, ror #16
hle_11_12c_mla 0x20
hle_11_12c_mla 0x28
hle_11_12c_mla 0x30
mov r8, r8, ror #16
orr r8, r8, #0x1c
@ hle_flushflags
hle_popstack
sub r11,r11,#33
b ssp_drc_next
ssp_hle_11_384:
mov r3, #2
b ssp_hle_11_38x
ssp_hle_11_38a:
mov r3, #3 @ r5
ssp_hle_11_38x:
cmp r11, #0
ble ssp_drc_end
mov r2, #0 @ EFh, EEh
mov r1, #1 @ r4
add r0, r7, #0x1c0 @ r0 (based)
ssp_hle_11_38x_loop:
ldrh r5, [r0], #2
ldr r12,[r7, #0x224]
mov r5, r5, lsl #16
eor r5, r5, r5, asr #31
add r5, r5, r5, lsr #31 @ abs(r5)
cmp r5, r12,lsl #16
orrpl r2, r2, r1,lsl #16 @ EFh |= r4
ldrh r5, [r0, #2]!
ldr r12,[r7, #0x220]
cmp r5, r12,lsr #16
orrpl r2, r2, r1,lsl #16 @ EFh |= r4
ldr r12,[r7, #0x1e8]
add r0, r0, #2
mov r12,r12,lsl #16
cmp r5, r12,lsr #16
orrmi r2, r2, r1
mov r1, r1, lsl #1
subs r3, r3, #1
bpl ssp_hle_11_38x_loop
str r2, [r7, #0x1dc]
sub r0, r0, r7
bic r8, r8, #0xff
orr r8, r8, r0, lsr #1
bic r9, r9, #0xff
orr r9, r9, r1
@ hle_flushflags
hle_popstack
sub r11,r11,#(9+30*4)
b ssp_drc_next
ssp_hle_07_6d6:
cmp r11, #0
ble ssp_drc_end
ldr r1, [r7, #0x20c]
and r0, r8, #0xff @ assuming alignment
add r0, r7, r0, lsl #1
mov r2, r1, lsr #16
mov r1, r1, lsl #16 @ 106h << 16
mov r2, r2, lsl #16 @ 107h << 16
ssp_hle_07_6d6_loop:
ldr r5, [r0], #4
tst r5, r5
bmi ssp_hle_07_6d6_end
mov r5, r5, lsl #16
cmp r5, r1
movmi r1, r5
cmp r5, r2
sub r11,r11,#16
bmi ssp_hle_07_6d6_loop
mov r2, r5
b ssp_hle_07_6d6_loop
ssp_hle_07_6d6_end:
sub r0, r0, r7
mov r0, r0, lsr #1
bic r8, r8, #0xff
orr r8, r8, r0
orr r1, r2, r1, lsr #16
str r1, [r7, #0x20c]
hle_popstack
sub r11,r11,#6
b ssp_drc_next
ssp_hle_07_030:
ldrh r0, [r7]
mov r0, r0, lsl #4
orr r0, r0, r0, lsr #16
strh r0, [r7]
sub r11,r11,#3
ssp_hle_07_036:
ldr r1, [r7, #0x1e0] @ F1h F0h
rsb r5, r1, r1, lsr #16
mov r5, r5, lsl #16 @ AL not needed
cmp r5, #(4<<16)
sub r11,r11,#5
bmi hle_07_036_ending2
ldr r1, [r7, #0x1dc] @ EEh
cmp r5, r1, lsl #16
sub r11,r11,#5
bpl hle_07_036_ret
mov r0, r5, lsr #16
add r1, r7, #0x100
strh r0, [r1, #0xea] @ F5h
ldr r0, [r7, #0x1e0] @ F0h
and r0, r0, #3
strh r0, [r1, #0xf0] @ F8h
add r2, r0, #0xc0 @ r2
add r2, r7, r2, lsl #1
ldrh r2, [r2]
ldr r0, [r7]
mov r1, #4
and r0, r0, r2
bl ssp_pm_write
@ will handle PMC later
ldr r0, [r7, #0x1e8] @ F5h << 16
ldr r1, [r7, #0x1f0] @ F8h
ldr r2, [r7, #0x1d4] @ EAh
sub r0, r0, #(3<<16)
add r0, r0, r1, lsl #16
sub r0, r2, r0, asr #18
and r0, r0, #0x7f
rsbs r0, r0, #0x78 @ length
ble hle_07_036_ending1
sub r11,r11,r0
@ copy part
ldr r1, [r7, #(SSP_OFFS_GR+SSP_PMC*4)]
ldr r2, [r7, #SSP_OFFS_DRAM]
mov r1, r1, lsl #16
add r1, r2, r1, lsr #15 @ addr (based)
ldrh r2, [r7, #0] @ pattern
ldrh r3, [r7, #6] @ mode
mov r12, #0x4000
orr r12,r12,#0x0018
subs r12,r3, r12
subnes r12,r12,#0x0400
blne tr_unhandled
orr r2, r2, r2, lsl #16
tst r3, #0x400
bne hle_07_036_ovrwr
hle_07_036_no_ovrwr:
tst r1, #2
strneh r2, [r1], #0x3e @ align
subne r0, r0, #1
subs r0, r0, #4
blt hle_07_036_l2
hle_07_036_l1:
subs r0, r0, #4
str r2, [r1], #0x40
str r2, [r1], #0x40
bge hle_07_036_l1
hle_07_036_l2:
tst r0, #2
strne r2, [r1], #0x40
tst r0, #1
strneh r2, [r1], #2
b hle_07_036_end_copy
hle_07_036_ovrwr:
tst r2, #0x000f
orreq r12,r12,#0x000f
tst r2, #0x00f0
orreq r12,r12,#0x00f0
tst r2, #0x0f00
orreq r12,r12,#0x0f00
tst r2, #0xf000
orreq r12,r12,#0xf000
orrs r12,r12,r12,lsl #16
beq hle_07_036_no_ovrwr
tst r1, #2
beq hle_07_036_ol0
ldrh r3, [r1]
and r3, r3, r12
orr r3, r3, r2
strh r3, [r1], #0x3e @ align
sub r0, r0, #1
hle_07_036_ol0:
subs r0, r0, #2
blt hle_07_036_ol2
hle_07_036_ol1:
subs r0, r0, #2
ldr r3, [r1]
and r3, r3, r12
orr r3, r3, r2
str r3, [r1], #0x40
bge hle_07_036_ol1
hle_07_036_ol2:
tst r0, #1
ldrneh r3, [r1]
andne r3, r3, r12
orrne r3, r3, r2
strneh r3, [r1], #2
hle_07_036_end_copy:
ldr r2, [r7, #SSP_OFFS_DRAM]
add r3, r7, #0x400
sub r0, r1, r2 @ new addr
mov r0, r0, lsr #1
strh r0, [r3, #(0x6c+4*4)] @ SSP_OFFS_PM_WRITE+4*4 (low)
hle_07_036_ending1:
ldr r0, [r7, #0x1e0] @ F1h << 16
add r0, r0, #(1<<16)
and r0, r0, #(3<<16)
add r0, r0, #(0xc4<<16)
bic r8, r8, #0xff0000
orr r8, r8, r0 @ r2
add r0, r7, r0, lsr #15
ldrh r0, [r0]
ldr r2, [r7]
and r0, r0, r2
movs r5, r0, lsl #16
ldr r1, [r7, #4] @ new mode
add r2, r7, #0x400
strh r1, [r2, #(0x6c+4*4+2)] @ SSP_OFFS_PM_WRITE+4*4 (high)
mov r1, #4
bl ssp_pm_write
sub r11,r11,#35
hle_07_036_ret:
hle_popstack
b ssp_drc_next
hle_07_036_ending2:
sub r11,r11,#3
movs r5, r5, lsl #1
bmi hle_07_036_ret
mov r0, #0x87
b ssp_drc_next @ let the dispatcher finish this
@ vim:filetype=armasm
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