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1 | @ vim:filetype=armasm |
2 | |
3 | @ ranges/opcodes (idle, normal): |
4 | @ 71xx, 73xx - bne.s (8bit offset) |
5 | @ 75xx, 77xx - beq.s (8bit offset) |
6 | @ 7dxx, 7fxx - bra.s (8bit offset) |
7 | |
8 | .data |
9 | .align 2 |
10 | |
11 | have_patches: |
12 | .word 0 |
13 | |
14 | .equ patch_desc_table_size, 10 |
15 | |
16 | patch_desc_table: |
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17 | .word (0x71fa<<16) | 0x66fa, idle_detector_bcc8, idle_bne, Op6602 @ bne.s |
18 | .word (0x71f8<<16) | 0x66f8, idle_detector_bcc8, idle_bne, Op6602 @ bne.s |
19 | .word (0x71f6<<16) | 0x66f6, idle_detector_bcc8, idle_bne, Op6602 @ bne.s |
20 | .word (0x71f2<<16) | 0x66f2, idle_detector_bcc8, idle_bne, Op6602 @ bne.s |
21 | .word (0x75fa<<16) | 0x67fa, idle_detector_bcc8, idle_beq, Op6702 @ beq.s |
22 | .word (0x75f8<<16) | 0x67f8, idle_detector_bcc8, idle_beq, Op6702 @ beq.s |
23 | .word (0x75f6<<16) | 0x67f6, idle_detector_bcc8, idle_beq, Op6702 @ beq.s |
24 | .word (0x75f2<<16) | 0x67f2, idle_detector_bcc8, idle_beq, Op6702 @ beq.s |
25 | .word (0x7dfe<<16) | 0x60fe, idle_detector_bcc8, idle_bra, Op6002 @ bra.s |
26 | .word (0x7dfc<<16) | 0x60fc, idle_detector_bcc8, idle_bra, Op6002 @ bra.s |
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27 | |
28 | |
29 | .text |
30 | .align 2 |
31 | |
32 | |
33 | .global CycloneInitIdle |
34 | |
35 | CycloneInitIdle: |
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36 | adr r12,offset_table |
37 | ldr r3, [r12, #2*4] @ =CycloneJumpTab-ot |
38 | ldr r2, [r12, #1*4] @ =patch_desc_table-ot |
39 | add r3, r3, r12 |
40 | add r2, r2, r12 |
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41 | mov r12,#patch_desc_table_size |
42 | |
43 | cii_loop: |
44 | ldrh r0, [r2] |
45 | ldr r1, [r2, #4] @ detector |
46 | str r1, [r3, r0, lsl #2] |
47 | ldrh r0, [r2, #2] |
48 | ldr r1, [r2, #8] @ idle |
49 | add r0, r3, r0, lsl #2 |
50 | str r1, [r0] |
51 | ldr r1, [r2, #12] @ normal |
52 | str r1, [r0, #0x800] |
53 | add r2, r2, #16 |
54 | subs r12,r12,#1 |
55 | bgt cii_loop |
56 | |
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57 | adr r12,offset_table |
58 | ldr r0, [r12, #0*4] @ =have_patches-ot |
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59 | mov r1, #1 |
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60 | str r1, [r0, r12] |
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61 | bx lr |
62 | |
63 | |
64 | .global CycloneFinishIdle |
65 | |
66 | CycloneFinishIdle: |
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67 | adr r12,offset_table |
68 | ldr r3, [r12, #0*4] @ =have_patches-ot |
69 | ldr r0, [r3, r12]! |
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70 | tst r0, r0 |
71 | bxeq lr |
72 | |
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73 | stmfd sp!, {r4,r5} |
74 | mov r5, r3 |
75 | ldr r2, [r12, #1*4] @ =patch_desc_table-ot |
76 | ldr r3, [r12, #2*4] @ =CycloneJumpTab-ot |
77 | ldr r4, [r12, #3*4] @ =Op____-ot |
78 | add r2, r2, r12 |
79 | add r3, r3, r12 |
80 | add r4, r4, r12 |
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81 | mov r12,#patch_desc_table_size |
82 | |
83 | cfi_loop: |
84 | ldrh r0, [r2] |
85 | ldr r1, [r2, #12] @ normal |
86 | str r1, [r3, r0, lsl #2] |
87 | ldrh r0, [r2, #2] |
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88 | add r0, r3, r0, lsl #2 |
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89 | str r4, [r0] @ Op____ |
90 | str r4, [r0, #0x800] |
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91 | add r2, r2, #16 |
92 | subs r12,r12,#1 |
93 | bgt cfi_loop |
94 | |
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95 | mov r1, #0 |
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96 | str r1, [r5] @ have_patches |
97 | ldmfd sp!, {r4,r5} |
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98 | bx lr |
99 | |
100 | |
101 | |
102 | .macro inc_counter cond |
103 | @ ldr\cond r0, [r7, #0x60] |
104 | @ mov r11,lr |
105 | @ sub r0, r4, r0 |
106 | @ sub r0, r0, #2 |
107 | @ bl\cond SekRegisterIdleHit |
108 | @ mov lr, r11 |
109 | .endm |
110 | |
111 | idle_bra: |
112 | mov r5, #2 |
113 | inc_counter |
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114 | b Op6002 |
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115 | |
116 | idle_bne: |
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117 | tst r10, #0x40000000 @ Z set? |
118 | moveq r5, #2 @ 2 is intentional due to strange timing issues |
119 | inc_counter eq |
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120 | b Op6602 |
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121 | |
122 | idle_beq: |
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123 | tst r10, #0x40000000 @ Z set? |
124 | movne r5, #2 |
125 | inc_counter ne |
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126 | b Op6702 |
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127 | |
128 | |
129 | @ @@@ @ |
130 | |
131 | idle_detector_bcc8: |
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132 | bl SekIsIdleReady |
133 | tst r0, r0 |
134 | beq exit_detector @ not yet |
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135 | |
136 | mov r0, r8, asl #24 @ Shift 8-bit signed offset up... |
137 | add r0, r4, r0, asr #24 @ jump dest |
138 | bic r0, r0, #1 |
139 | |
140 | mov r1, #0 |
141 | sub r1, r1, r8, lsl #24 |
142 | mov r1, r1, lsr #24 |
143 | sub r1, r1, #2 |
144 | bic r1, r1, #1 |
145 | |
146 | bl SekIsIdleCode |
147 | tst r0, r0 |
148 | and r2, r8, #0x00ff |
149 | orr r2, r2, #0x7100 |
150 | orreq r2, r2, #0x0200 |
151 | mov r0, r8, lsr #8 |
152 | cmp r0, #0x66 |
153 | orrgt r2, r2, #0x0400 @ 67xx (beq) |
154 | orrlt r2, r2, #0x0c00 @ 60xx (bra) |
155 | |
156 | @ r2 = patch_opcode |
157 | sub r0, r4, #2 |
158 | ldrh r1, [r0] |
159 | mov r11,r2 |
160 | mov r3, r7 |
161 | bl SekRegisterIdlePatch |
162 | cmp r0, #1 @ 0 - ok to patch, 1 - no patch, 2 - remove detector |
163 | strlth r11,[r4, #-2] |
164 | ble exit_detector |
165 | |
166 | @ remove detector from Cyclone |
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167 | adr r12,offset_table |
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168 | mov r0, r8, lsr #8 |
169 | cmp r0, #0x66 |
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170 | ldrlt r1, [r12, #4*4] @ =Op6002-ot |
171 | ldreq r1, [r12, #4*5] @ =Op6602-ot |
172 | ldrgt r1, [r12, #4*6] @ =Op6702-ot |
173 | add r1, r1, r12 |
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174 | |
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175 | str r1, [r6, r8, lsl #2] |
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176 | bx r1 |
177 | |
178 | exit_detector: |
179 | mov r0, r8, lsr #8 |
180 | cmp r0, #0x66 |
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181 | blt Op6002 |
182 | beq Op6602 |
183 | b Op6702 |
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184 | |
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185 | offset_table: |
186 | .word have_patches - offset_table |
187 | .word patch_desc_table - offset_table |
188 | .word CycloneJumpTab - offset_table |
189 | .word Op____ - offset_table |
190 | .word Op6002 - offset_table |
191 | .word Op6602 - offset_table @ 5 |
192 | .word Op6702 - offset_table |