Martin Michelsen
29 lines
727 B
ArmAsm
29 lines
727 B
ArmAsm
mova r0, [first_patch_header]
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mov r7, r0 # r7 = read ptr
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xor r3, r3
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dec r3
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shl r3, 2 # r3 = 0xFFFFFFFC (mask for aligning r7)
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apply_patch:
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add r7, 3
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and r7, r3 # r7 = (r7 + 3) & (~3) (align to 4-byte boundary)
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mov.l r4, [r7]+ # r4 = dest addr
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mov.l r5, [r7]+
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add r5, r4 # r5 = dest end ptr (dest addr + size)
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cmpeq r4, r5 # if (size == 0) return
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bt done
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again:
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cmpeq r4, r5
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bt apply_patch # if (r4 == r5) done with the patch; go to next header
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mov.b r0, [r7]+
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mov.b [r4], r0 # *(r4) = *(r7++);
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bs again # r4++; continue
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add r4, 1
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done:
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rets
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nop
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.align 4
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first_patch_header:
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