improve "IP" decompilation
This commit is contained in:
parent
07e3c9eb06
commit
c3bfbb7b90
2
burn.sh
Normal file
2
burn.sh
Normal file
@ -0,0 +1,2 @@
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cdrecord -speed=8 -v dev=/dev/sr0 -dao -multi taudio01.wav
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cdrecord -eject -overburn -speed=8 -v dev=/dev/sr0 -tao -xa tdata02.iso
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20
common.mk
20
common.mk
@ -21,16 +21,16 @@ IP_OBJ = \
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systemid.o \
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toc.o \
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sg/sg_sec.o \
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sg/sg_arejp.o \
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sg/sg_areus.o \
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sg/sg_areec.o \
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sg/sg_are00.o \
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sg/sg_are01.o \
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sg/sg_are02.o \
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sg/sg_are03.o \
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sg/sg_are04.o \
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sg/sg_ini.o \
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sg/aip.o
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sg_arejp.o \
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sg_areus.o \
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sg_areec.o \
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sg_are00.o \
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sg_are01.o \
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sg_are02.o \
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sg_are03.o \
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sg_are04.o \
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sg_ini.o \
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aip.o
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%.o: %.obj
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$(OBJCOPY) -g \
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4
ip.lds
4
ip.lds
@ -42,11 +42,13 @@ SECTIONS
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.text.sg_ini :
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{
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KEEP(*(.text.*sg_ini))
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. = ORIGIN(sg_ini) + LENGTH(sg_ini);
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} > sg_ini
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.text.aip :
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{
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KEEP(*(.text.*aip))
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. = ORIGIN(aip) + LENGTH(aip);
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} > aip
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/DISCARD/ :
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@ -56,4 +58,6 @@ SECTIONS
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*(.bss)
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*(.comment)
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}
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INCLUDE "debug.lds"
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}
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5
sg_are00.s
Normal file
5
sg_are00.s
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@ -0,0 +1,5 @@
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.section .text.sg_are00
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bra _sg_are00_next
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nop
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.ascii " "
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_sg_are00_next:
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5
sg_are01.s
Normal file
5
sg_are01.s
Normal file
@ -0,0 +1,5 @@
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.section .text.sg_are01
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bra _sg_are01_next
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nop
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.ascii " "
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_sg_are01_next:
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5
sg_are02.s
Normal file
5
sg_are02.s
Normal file
@ -0,0 +1,5 @@
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.section .text.sg_are02
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bra _sg_are02_next
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nop
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.ascii " "
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_sg_are02_next:
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5
sg_are03.s
Normal file
5
sg_are03.s
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@ -0,0 +1,5 @@
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.section .text.sg_are03
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bra _sg_are03_next
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nop
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.ascii " "
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_sg_are03_next:
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5
sg_are04.s
Normal file
5
sg_are04.s
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@ -0,0 +1,5 @@
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.section .text.sg_are04
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bra _sg_are04_next
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nop
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.ascii " "
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_sg_are04_next:
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5
sg_areec.s
Normal file
5
sg_areec.s
Normal file
@ -0,0 +1,5 @@
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.section .text.sg_areec
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bra _sg_areec_next
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nop
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.ascii "For EUROPE. "
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_sg_areec_next:
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5
sg_arejp.s
Normal file
5
sg_arejp.s
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@ -0,0 +1,5 @@
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.section .text.sg_arejp
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bra _sg_arejp_next
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nop
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.ascii "For JAPAN,TAIWAN,PHILIPINES."
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_sg_arejp_next:
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5
sg_areus.s
Normal file
5
sg_areus.s
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@ -0,0 +1,5 @@
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.section .text.sg_areus
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bra _sg_areus_next
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nop
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.ascii "For USA and CANADA. "
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_sg_areus_next:
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250
sg_ini.s
250
sg_ini.s
@ -2,7 +2,7 @@
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.global _text_sg_ini_start
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_text_sg_ini_start:
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mov.l label_18,r0 /* 8d000000 → beginning of system ram, image area */
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mov.l label_18,r0 /* 8d000000 → end of system ram */
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mov r0,r15
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nop
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nop
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@ -23,26 +23,36 @@ label_20:
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.fill 0x2000,1,0x00
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label_2020:
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/* function that processes the list of addresses/values at label_2284 */
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mov.l label_204c,r0 /* 8c00d940 → label_2140 */
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mov #0,r1
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jsr @r0
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nop
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/* ???? possibly jump to boot menu? */
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mov.l label_2050,r0 /* 8c00d900 → label_2100 */
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jsr @r0
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nop
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/* possibly jump to boot menu? */
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mov.l label_2054,r0 /* 8c00d888 → label_2088 */
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jsr @r0
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nop
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/* check for Windows CE? */
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mov.l label_2058,r0 /* 8c00dae0 → label_22e0 */
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jsr @r0
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nop
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mov.l label_205c,r0 /* 8c00db40 → label_2340 */
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jsr @r0
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nop
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nop
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mov.l label_2060,r0 /* 8c00d86c → label_206c */
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jmp @r0
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nop
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nop
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nop
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@ -80,7 +90,7 @@ label_2084:
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label_2088:
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sts.l pr,@-r15
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mov.l label_20a4,r0 /* 8c000048 */
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mov.l @r0,r0
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mov.l @r0,r0 /* r0 ← 1 */
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cmp/eq #6,r0
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bt label_209e
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cmp/eq #7,r0
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@ -98,6 +108,7 @@ label_20a4:
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label_20a8:
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.long 0x8c00d8ac
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/* jump back to boot menu? */
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label_20ac:
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mov.l label_20b4,r0 /* 8c0000e0 */
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mov.l @r0,r0
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@ -108,61 +119,68 @@ label_20b4:
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label_20b8:
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exts.b r4,r0
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mov #57,r1
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mov #57,r1 /* ascii '9' */
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cmp/gt r1,r0
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bf label_20c2
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add #-7,r0
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label_20c2:
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rts
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add #-48,r0
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/* called from label_2100 and label_22e0 */
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label_20c6:
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xor r2,r2
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sts.l pr,@-r15
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mov.b @r4,r4
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mov r4,r0
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cmp/eq #32,r0
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bt label_20e0
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bsr label_20b8
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mov.b @r4,r4 /* r4 ← (0x8c00803e) = 0x30 */
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mov r4,r0 /* r0 ← 0x30 */
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cmp/eq #0x20,r0 /* check for ascii space in 'Compatible peripherals' of systemid */
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bt label_20e0 /* if it is space, return 0 */
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bsr label_20b8 /* ascii 0-9 to integer */
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nop
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mov #1,r1
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tst r1,r0
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bt.s label_20e0
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tst r1,r0 /* check for ascii '1' / "uses Windows CE" */
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bt.s label_20e0 /* if not "uses Windows CE", take branch to label_20e0 */
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xor r2,r2
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mov #1,r2
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label_20e0:
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lds.l @r15+,pr
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rts
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mov r2,r0
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mov r2,r0 /* return 1 if Windows CE, 0 if not */
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.word 0xffff
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label_20e8:
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mov.l label_20fc,r1 ! 8c008024
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mov.l label_20f8,r3 ! 4c494d20
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mov.l @r1,r2
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mov.l label_20f8,r3 /* ascii ' MIL' ; 0x4c494d20 */
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mov.l @r1,r2 /* r2 ← 0x2d444720 ' GD-' */
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cmp/eq r3,r2
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movt r0
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rts
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nop
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nop
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label_20f8:
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.long 0x4c494d20
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.ascii " MIL" /* 4c494d20 */
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label_20fc:
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.long 0x8c008024
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/* called from label_2020 */
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label_2100:
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sts.l pr,@-r15
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mov.l label_212c,r3 /* 8c00d8c6 → label_20c6 */
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mov.l label_213c,r4 ! 8c008000
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mov.l label_213c,r4 /* 8c008000 */
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jsr @r3
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add #62,r4
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tst r0,r0
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add #0x3e,r4 /* r4 ← 0x8c00803e */
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tst r0,r0 /* check return value != 0 */
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bf label_2126
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/* check for ' MIL' CD */
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mov.l label_2130,r3 /* 8c00d8e8 → label_20e8 */
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jsr @r3
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nop
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tst r0,r0
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tst r0,r0 /* check return value != 0 */
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bf label_2126
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mov.l label_2138,r3 ! 8c010000
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mov.w @r3,r0
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cmp/eq #34,r0
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cmp/eq #34,r0 /* check for 'stc vbr,r0' ?? */
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bf label_2126
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mov.l label_2134,r1 /* 8c00d8ac → label_20ac */
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jmp @r1
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@ -182,22 +200,25 @@ label_2138:
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label_213c:
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.long 0x8c008000
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/* function that processes the list of addresses/values at label_2284 */
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label_2140:
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mov.l r2,@-r15
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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sts.l pr,@-r15
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mova label_2284,r0
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mov.w @(r0,r1),r1
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add r1,r0
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mova label_2284,r0 /* 0x8c00da84 */
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mov.w @(r0,r1),r1 /* 0x2 */
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add r1,r0 /* 0x8c00da86 */
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label_2150:
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add #3,r0
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shlr2 r0
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shll2 r0
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mov.w @r0+,r4
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tst r4,r4
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bf label_2172
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shll2 r0 /* #1 r0 ← 0x8c00da88
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#2 r0 ← 0x8c00da90 */
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mov.w @r0+,r4 /* #1 r0 ← 0x8c00da8a ; r4 ← 2
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#2 r4 ← 1 */
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tst r4,r4 /* r4 & r4 != 0 → T unset */
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bf label_2172 /* branch taken */
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mov.w @r0+,r4
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tst r4,r4
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bf.s label_2150
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@ -210,20 +231,22 @@ label_2150:
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rts
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sett
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label_2172:
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mov.w @r0+,r3
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mov.l label_2278,r1 ! ffff8000
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and r3,r1
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tst r1,r1
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bt label_2180
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mov.w @r0+,r3 /* #1 0x8c00da8a ; r0 ← 0x8c00da8c ; r3 ← 0x6
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#2 0x8c00da92 ; r0 ← 0x8c00da94 ; r3 ← 0x18
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*/
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mov.l label_2278,r1 /* ffff8000 */
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and r3,r1 /* r1 ← 0 */
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tst r1,r1 /* r1 & r1 == 0 → T set */
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bt label_2180 /* branch taken */
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xor r1,r3
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bf label_2182
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label_2180:
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mov.l @r0+,r2
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mov.l @r0+,r2 /* 0x8c00da8c ; r2 ← 0xff000038 */
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label_2182:
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mov.l label_227c,r1 ! 6000
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and r3,r1
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tst r1,r1
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bt label_21a0
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mov.l label_227c,r1 /* r1 ← 6000 */
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and r3,r1 /* r1 ← 0 */
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tst r1,r1 /* T set */
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bt label_21a0 /* branch taken */
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xor r1,r3
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add #12,r3
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mov.l @r0+,r1
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@ -236,27 +259,43 @@ label_2194:
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add #4,r2
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bra label_2150
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mov r5,r0
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/* branch from label_2182 */
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label_21a0:
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bsrf r3
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dt r4
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bf.s label_21a0
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add #4,r2
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bt label_2150
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bsrf r3 /* #1 0x06 ; PC ← 0x8c00d9aa (label_21aa)
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#2 0x18 ; PC ← 0x8c00d9bc (label_2abc)
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#3 0x0c ; PC ← 0x8c00d9b0 (label_21b0)
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*/
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dt r4 /* #1 r4 ← 1 ; T unset
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#2 r4 ← 0 ; T set
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#3 r4 ← 3 ; T unset
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*/
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bf.s label_21a0 /* #1 branch taken ; #2 branch not taken */
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add #4,r2 /* 0xff000038 ; r2 ← 0xff00003c */
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bt label_2150 /* branch taken */
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label_21aa:
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mov #0,r1
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rts
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mov.l r1,@r2
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label_21b0:
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mov #0,r1
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rts
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mov.w r1,@r2
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mov #0,r1
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rts
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mov.b r1,@r2
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mov.l @r0+,r1
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label_21bc:
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mov.l @r0+,r1 /* 0x8c00da98 ; r1 ← 0x12c0 */
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rts
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mov.l r1,@r2
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mov.l r1,@r2 /* 0xffa0002c ; CHCR2 ← 0x000012c0
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DM: fixed
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SM: incremented
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RS: external request, single address mode
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*/
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label_21c2:
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mov.w @r0+,r1
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rts
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mov.l r1,@r2
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mov.l @r0+,r1
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rts
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mov.b r1,@r2
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@ -357,50 +396,90 @@ label_2278:
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label_227c:
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.long 0x00006000
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/* unreachable? */
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.word 0x8040
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.word 0xa05f
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.long 0xa05f8040 /* unused; VO_BORDER_COL */
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label_2284:
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.word 0x0002
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.word 0x0009
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label_2286:
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.word 0x0009 /* unused garbage data? */
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label_2288:
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.word 0x0002
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.word 0x0006
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.word 0x0038
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.word 0xff00
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label_228a:
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.word 0x0006 /* r3 */
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label_228c:
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.long 0xff000038
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label_2290:
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.word 0x0001
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.word 0x0018
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.word 0x002c
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.word 0xffa0
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.word 0x12c0
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.word 0x0000
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label_2292:
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.word 0x0018 /* r3 */
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label_2294:
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.long 0xffa0002c /* CHCR2 ← 0x000012c0 */
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label_2298:
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.long 0x000012c0
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label_229c:
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.word 0x0004
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label_229e:
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.word 0x000c
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.word 0x0000
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.word 0xffd0
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.word 0x0001
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.word 0x0018
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.word 0x0024
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.word 0xff00
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.word 0x0020
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.word 0x0000
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.word 0x0002
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.word 0x001e
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.word 0x7490
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.word 0xa05f
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label_22a0:
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.long 0xffd00000 /* ICR ← 0
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IPRA ← 0
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IPRB ← 0
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IPRC ← 0
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*/
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label_22a4:
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.word 0x0001 /* r4 */
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label_22a6:
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.word 0x0018 /* r3 → bsrf label_21bc */
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label_22a8:
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.long 0xff000024 /* r2
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?? ← 0x00000020 */
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label_22ac:
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.long 0x00000020 /* r1 */
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label_22b0:
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.word 0x0002 /* r4 */
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label_22b2:
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.word 0x001e /* r3 → bsrf label_21c2 */
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label_22b4:
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.long 0xa05f7490 /* r2
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SB_G1CRC ← 0x0222
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SB_G1CWC ← 0x0222
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*/
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label_22b8:
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.word 0x0222
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label_22ba:
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.word 0x0222
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.word 0x0002
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.word 0x001e
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.word 0x74a0
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.word 0xa05f
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label_22bc:
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.word 0x0002 /* r4 */
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label_22be:
|
||||
.word 0x001e /* r3 → bsrf label_21c2 */
|
||||
label_22c0:
|
||||
.long 0xa05f74a0 /* r2
|
||||
SB_G1GDRC ← 0x2001
|
||||
SB_G1GDWC ← 0x2001
|
||||
*/
|
||||
label_22c4:
|
||||
.word 0x2001
|
||||
label_22c6:
|
||||
.word 0x2001
|
||||
.word 0x0002
|
||||
.word 0x001e
|
||||
.word 0x7890
|
||||
.word 0xa05f
|
||||
|
||||
label_22c8:
|
||||
.word 0x0002 /* r4 */
|
||||
label_22ca:
|
||||
.word 0x001e /* r3 → bsrf label_21c2 */
|
||||
label_22cc:
|
||||
.long 0xa05f7890 /* SB_G2DSTO ← 0x001b
|
||||
SB_G2TRTO ← 0x0271
|
||||
*/
|
||||
label_22d0:
|
||||
.word 0x001b
|
||||
label_22d2:
|
||||
.word 0x0271
|
||||
|
||||
label_22d4:
|
||||
.word 0x0000
|
||||
.word 0x0000
|
||||
nop
|
||||
@ -408,14 +487,16 @@ label_2284:
|
||||
nop
|
||||
nop
|
||||
|
||||
/* called from label_2020 */
|
||||
label_22e0:
|
||||
sts.l pr,@-r15
|
||||
mov.l label_2330,r4 ! 8c008000
|
||||
mov.l label_2328,r3 ! 8c00d8c6
|
||||
/* check systemid for "uses Windows CE" */
|
||||
mov.l label_2330,r4 /* 8c008000 systemid */
|
||||
mov.l label_2328,r3 /* 8c00d8c6 label_20c6 */
|
||||
jsr @r3
|
||||
add #62,r4
|
||||
tst r0,r0
|
||||
bt label_2320
|
||||
add #0x3e,r4
|
||||
tst r0,r0 /* r0 (1 if Windows CE) */
|
||||
bt label_2320 /* if not Windows CE, return */
|
||||
mov.l label_2334,r1 ! 8ce01010
|
||||
mov.l @r1,r0
|
||||
tst r0,r0
|
||||
@ -467,10 +548,11 @@ label_2340:
|
||||
add #-20,r15
|
||||
mov r15,r3
|
||||
mov r15,r5
|
||||
mov.l r3,@(16,r15)
|
||||
mov.l r3,@(16,r15) /* copy stack pointer to stack */
|
||||
add #16,r5
|
||||
bsr label_23e0
|
||||
mov #30,r4
|
||||
|
||||
mov r0,r4
|
||||
tst r4,r4
|
||||
bt label_2384
|
||||
@ -554,7 +636,7 @@ label_23e0:
|
||||
mov #0,r6
|
||||
mov #0,r7
|
||||
mov.l label_2404,r0 ! 8c0000bc
|
||||
mov.l @r0,r0
|
||||
mov.l @r0,r0 /* r0 ← 0x8c001000 */
|
||||
label_23e8:
|
||||
jmp @r0
|
||||
nop
|
||||
@ -562,14 +644,14 @@ label_23ec:
|
||||
mov #0,r6
|
||||
mov #1,r7
|
||||
mov.l label_2404,r0 ! 8c0000bc
|
||||
mov.l @r0,r0
|
||||
mov.l @r0,r0 /* r0 ← 0x8c001000 */
|
||||
jmp @r0
|
||||
nop
|
||||
label_23f8:
|
||||
mov #0,r6
|
||||
mov #2,r7
|
||||
mov.l label_2404,r0 ! 8c0000bc
|
||||
mov.l @r0,r0
|
||||
mov.l @r0,r0 /* r0 ← 0x8c001000 */
|
||||
jmp @r0
|
||||
nop
|
||||
label_2404:
|
||||
|
||||
10
systemid.s
10
systemid.s
@ -34,12 +34,12 @@
|
||||
|
||||
.section .text.systemid
|
||||
|
||||
.ascii "SEGA SEGAKATANA " /* H/W identifier */
|
||||
.ascii "SEGA ENTERPRISES" /* H/W Vendor ID */
|
||||
.ascii "39F1 " /* Media ID */
|
||||
.ascii "SEGA SEGAKATANA " /* 0x00 H/W identifier */
|
||||
.ascii "SEGA ENTERPRISES" /* 0x10 H/W Vendor ID */
|
||||
.ascii "39F1 " /* 0x20 Media ID */
|
||||
.ascii "GD-ROM1/1 " /* Media information */
|
||||
.ascii "JUE " /* Compatible Area Symbol */
|
||||
.ascii "C000810 " /* Compatible peripherals */
|
||||
.ascii "JUE " /* 0x30 Compatible Area Symbol */
|
||||
.ascii "C000810 " /* Compatible peripherals */
|
||||
.ascii "HDR-0900 " /* Product number */
|
||||
.ascii "V0.000" /* Version number */
|
||||
.ascii "19980901" /* Release date */
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user