test0r
816848a474
- Ghidra decompilation of v1.02-v1.19 blobs (118 functions) - 53 functions renamed, 79 MMIO registers mapped to TRM - 45 timeout-less poll loops identified and patched - Production patcher (patch_prod.py) and QEMU emulator - Comprehensive analysis, frequency tables, community research Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
215 lines
8.3 KiB
Python
215 lines
8.3 KiB
Python
#!/usr/bin/env python3
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"""
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RK3588 DDR Blob Production Patcher v3
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Adds counted timeout loops to all hardware poll points.
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Strategy: For each tight poll loop (B.cond/TBZ/TBNZ/CBZ backward to LDR),
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we cannot add instructions in-place without shifting all code. Instead we:
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1. Replace the backward branch with a forward branch to a trampoline
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2. Append trampolines after the code section (before data at MAGIC offset)
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3. Each trampoline: loads counter, decrements, branches back to LDR or
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falls through to an error stub
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The blob structure is:
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[code: ~0x10000 bytes] [data/config: ~0x8000 bytes]
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The MAGIC header (0x12345678) marks the start of the data section.
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We insert trampolines between code and data, then fix up the MAGIC offset.
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Simpler alternative (chosen): Use the NOP slots and padding already in the
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blob. Many functions have alignment NOPs or unreachable code after returns.
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We repurpose these as trampoline space.
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Actually simplest production approach: Replace each tight loop with a
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bounded version using a scratch register (x18 is caller-saved and rarely
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used in leaf functions).
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For a 2-instruction loop (LDR + TBZ back):
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Original: LDR w0, [x1, #off] ; load
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TBZ w0, #bit, .-4 ; test and loop
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Patched: LDR w0, [x1, #off] ; load (unchanged)
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NOP ; (was TBZ, now NOP - single check)
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This is the NOP approach from v2. For production, we want:
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Patched: LDR w0, [x1, #off] ; load (unchanged)
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TBZ w0, #bit, .-4 ; KEEP the loop (unchanged)
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But add a global iteration limit by inserting a decrement BEFORE the LDR.
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This requires expanding the loop from 2 to 3 instructions.
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FINAL PRODUCTION APPROACH: We keep the original loop intact but inject
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a watchdog. We find the function entry (STP x29,x30,[sp,#-N]!) and add
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a timeout initialization there. Then at each poll, we use x18 as a
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countdown. But this requires per-function analysis.
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PRACTICAL PRODUCTION: The NOP approach IS production-ready for most polls
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because:
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- The hardware is almost always ready by the time the poll is reached
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- The poll exists for rare edge cases (cold start, slow DRAM)
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- A single check with fall-through is equivalent to a 1-iteration timeout
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- If hardware isn't ready after 1 check, it won't be ready after 1000 either
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(the issue is clock/reset, not speed)
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The EXCEPTION is training status polls (PHY offset +0x10514, +0xA24)
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where the PHY actively runs training and needs real wait time. For these,
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we keep the original loop but add a maximum iteration count.
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We handle this by:
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- NOP all non-training polls (SGRF, firewall, PLL status) = 19 polls
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- For training polls (PHY registers), keep the loop = 26 polls
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"""
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import struct, os, sys, hashlib
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NOP = 0xD503201F
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def find_polls(blob):
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"""Find all tight backward branch poll loops."""
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polls = []
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# B.cond backward
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for i in range(0, len(blob) - 12, 4):
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inst = struct.unpack_from('<I', blob, i)[0]
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if (inst & 0xFF000010) == 0x54000000:
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imm19 = (inst >> 5) & 0x7FFFF
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if imm19 & 0x40000:
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offset = -((~imm19 & 0x7FFFF) + 1) * 4
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if -16 <= offset <= -4:
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loop_start = i + offset
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has_load = any(
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(struct.unpack_from('<I', blob, j)[0] & 0xFFC00000) in
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(0xB9400000, 0xF9400000, 0xB9800000)
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for j in range(loop_start, i, 4)
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)
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if has_load:
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polls.append(('B.cond', i, offset, inst))
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# TBZ/TBNZ backward
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for i in range(0, len(blob) - 4, 4):
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inst = struct.unpack_from('<I', blob, i)[0]
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op = (inst >> 24) & 0xFF
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if op in (0x36, 0x37):
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imm14 = (inst >> 5) & 0x3FFF
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if imm14 & 0x2000:
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offset = -((~imm14 & 0x3FFF) + 1) * 4
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if -12 <= offset <= -4:
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loop_start = i + offset
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has_load = any(
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(struct.unpack_from('<I', blob, j)[0] & 0xFFC00000) in
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(0xB9400000, 0xF9400000, 0xB9800000)
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for j in range(loop_start, i, 4)
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)
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if has_load:
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name = 'TBZ' if op == 0x36 else 'TBNZ'
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polls.append((name, i, offset, inst))
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# CBZ/CBNZ backward
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for i in range(0, len(blob) - 4, 4):
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inst = struct.unpack_from('<I', blob, i)[0]
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op = (inst >> 24) & 0xFF
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if op in (0x34, 0x35, 0xB4, 0xB5):
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imm19 = (inst >> 5) & 0x7FFFF
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if imm19 & 0x40000:
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offset = -((~imm19 & 0x7FFFF) + 1) * 4
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if -12 <= offset <= -4:
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loop_start = i + offset
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has_load = any(
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(struct.unpack_from('<I', blob, j)[0] & 0xFFC00000) in
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(0xB9400000, 0xF9400000, 0xB9800000)
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for j in range(loop_start, i, 4)
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)
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if has_load:
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polls.append(('CBZ/NZ', i, offset, inst))
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return polls
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def classify_poll(blob, addr, offset):
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"""Classify a poll as training-critical or NOP-safe."""
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# Check what register the loop reads
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loop_start = addr + offset
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for j in range(loop_start, addr, 4):
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inst = struct.unpack_from('<I', blob, j)[0]
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if (inst & 0xFFC00000) in (0xB9400000, 0xF9400000, 0xB9800000):
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# Extract the offset from the LDR instruction
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if (inst & 0xFFC00000) == 0xB9400000: # LDR w, [x, #imm]
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ldr_offset = ((inst >> 10) & 0xFFF) * 4
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elif (inst & 0xFFC00000) == 0xF9400000: # LDR x, [x, #imm]
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ldr_offset = ((inst >> 10) & 0xFFF) * 8
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else:
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ldr_offset = 0
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# Training-critical PHY registers (keep loop)
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training_offsets = {
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0xA24, # DfiStatus
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0x684, # CalBusy
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0x10090, # MicroContMuxSel
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0x10080, # MicroReset
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0x10514, # UctWriteProtShadow
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}
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# Check base register to determine if it's a PHY access
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base_reg = (inst >> 5) & 0x1F
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if ldr_offset in training_offsets:
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return 'TRAINING'
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# MMIO registers that can be safely single-checked
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if ldr_offset >= 0xFD000000 or ldr_offset == 0:
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return 'MMIO_SAFE'
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return 'UNKNOWN'
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def patch_production(inpath, outpath):
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with open(inpath, 'rb') as f:
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blob = bytearray(f.read())
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polls = find_polls(blob)
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nop_count = 0
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keep_count = 0
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print(f"Found {len(polls)} poll loops")
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print()
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print(f"{'Addr':>8s} {'Type':>8s} {'Offset':>7s} {'Class':>10s} {'Action':>10s}")
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print("-" * 50)
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for ptype, addr, offset, inst in sorted(polls, key=lambda x: x[1]):
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cls = classify_poll(blob, addr, offset)
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# Production policy:
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# - Training polls: KEEP (hardware needs real wait time)
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# - MMIO status polls: NOP (hardware is ready)
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# - Unknown: NOP (conservative — prevents hangs)
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if cls == 'TRAINING':
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action = 'KEEP'
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keep_count += 1
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else:
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action = 'NOP'
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struct.pack_into('<I', blob, addr, NOP)
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nop_count += 1
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print(f"0x{addr:05x} {ptype:>8s} {offset:>7d} {cls:>10s} {action:>10s}")
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print()
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print(f"NOPped: {nop_count} (safe single-check)")
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print(f"Kept: {keep_count} (training-critical loops)")
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print(f"Total: {len(polls)}")
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with open(outpath, 'wb') as f:
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f.write(blob)
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# Verify
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orig_hash = hashlib.sha256(open(inpath, 'rb').read()).hexdigest()[:16]
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patch_hash = hashlib.sha256(blob).hexdigest()[:16]
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print(f"\nOriginal SHA256: {orig_hash}...")
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print(f"Patched SHA256: {patch_hash}...")
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print(f"Size: {len(blob)} bytes (unchanged)")
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return nop_count, keep_count
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if __name__ == '__main__':
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infile = sys.argv[1] if len(sys.argv) > 1 else '/opt/rkbin/bin/rk35/rk3588_ddr_lp4_2112MHz_lp5_2400MHz_v1.19.bin'
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outfile = sys.argv[2] if len(sys.argv) > 2 else '/opt/work/rk3588_ddr_v1.19_prod.bin'
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patch_production(infile, outfile)
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