test0r
2bec08a868
The blob is position-dependent: entry code at 0x14-0x1c does (return_addr & 0xFFFFFF00) == 0xFF001000 to validate the caller. Previously we loaded at 0x0, so the check could never pass and emu hung at 0x1c forever. Fixed: load blob at 0xFF001000 (bootrom TPL slot), map SRAM window 0xFF000000..0xFF100000, let x30 point at RET_STUB outside the window. Emu now runs through the integrity check, the first ~120 instructions of entry dispatch, and stops at blob+0x10A80 on an MSR/MRS sysreg access Unicorn doesn|t model -- the same depth ddr_emu2.c (C version) historically reached. Stock and patched (--sites all) behave identically under both --stub 0x00 and 0xFF. That|s the regression gate: any future patch that crashes in the pre-sysreg segment will diverge. Also added catch-all UC_HOOK_MEM_UNMAPPED with lazy 64KB page-map + stub fallback so unknown MMIO targets don|t crash the emu before we know about them.
168 lines
6.7 KiB
Python
Executable File
168 lines
6.7 KiB
Python
Executable File
#!/usr/bin/env python3
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"""DDR blob emulator — runs a raw (plaintext) RK3588 DDR init blob
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in Unicorn, stubs MMIO reads to a constant byte. Intent: smoke-test a
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patched blob to catch crashes/hangs before committing to a real flash.
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Usage: blob_emu.py <blob.bin> [--stub 0x00|0xFF] [--max N] [--trace]
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"""
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import argparse, sys
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from unicorn import *
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from unicorn.arm64_const import *
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# The blob is position-dependent: it expects to be loaded at 0xFF001000
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# (the RK3588 bootrom's TPL SRAM slot). An integrity check at 0x14-0x1c
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# ANDs the BL return address with 0xFFFFFF00 and compares to 0xFF001000.
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SRAM_BASE = 0xFF000000
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SRAM_SIZE = 0x00100000 # 1 MB SRAM window (covers 0xFF000000..0xFF100000)
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BLOB_BASE = 0xFF001000 # where the blob actually lives
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STACK_BASE = 0x00400000
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STACK_SIZE = 0x00100000
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RET_STUB = 0x00800000
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RET_SIZE = 0x00001000
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MMIO = [
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(0xFD580000, 0x00020000, "GRF"),
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(0xFD5F0000, 0x00010000, "BUS_GRF"),
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(0xFD7C0000, 0x00040000, "CRU"),
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(0xFD8C0000, 0x00010000, "SCRU"),
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(0xFE010000, 0x00020000, "DDRC"),
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(0xFE030000, 0x00010000, "FW_DDR"),
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(0xFE050000, 0x00010000, "SGRF"),
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(0xFE0C0000, 0x00040000, "DDRPHY"),
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(0xFE400000, 0x00010000, "PMU"),
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(0xFECC0000, 0x00010000, "SCRAMBLE"),
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# SRAM_BOOT (0xFF000000..0xFF100000) is regular RWX memory where
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# the blob lives, NOT MMIO — not listed here.
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]
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# Per-address stub values — ported from ddr_emu2.c.
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# Each entry: address → value to return on read.
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# Use base + offset; the MMIO read hook checks exact match first,
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# then falls back to region-specific patterns, then to the constant stub.
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ABS_STUB = {
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# SGRF (0xFE050000)
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0xFE0500E0: 0x00000000, # status = ready
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0xFE050054: 0x00000001, # CON21 = done
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0xFE0500E4: 0x00000000, # enable
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}
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# Region-offset patterns: (region_base, region_end, offset_mask, offset_value, return_value)
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REGION_OFF = [
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# DDRPHY (0xFE0C0000..0xFE100000), offset masked to lower 12 bits
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(0xFE0C0000, 0xFE100000, 0xFFF, 0xA24, 0x00000002), # DfiStatus ready
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(0xFE0C0000, 0xFE100000, 0xFFF, 0x684, 0x00000000), # CalBusy idle
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(0xFE0C0000, 0xFE100000, 0xFFF, 0x090, 0x00000000), # MicroContMux
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(0xFE0C0000, 0xFE100000, 0xFFF, 0x080, 0x00000000), # MicroReset done
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(0xFE0C0000, 0xFE100000, 0xFFF, 0x514, 0x00000000), # training done
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]
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# Region constants: entire region returns this by default
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REGION_CONST = [
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(0xFD8C0000, 0xFD8D0000, 0x00000001), # SCRU — PLL locked everywhere
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]
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def run(blob_path, stub_byte, max_insn, trace, entry=0):
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blob = open(blob_path, "rb").read()
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print(f"blob: {blob_path} size=0x{len(blob):x} stub=0x{stub_byte:02x}")
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uc = Uc(UC_ARCH_ARM64, UC_MODE_ARM)
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uc.mem_map(SRAM_BASE, SRAM_SIZE, UC_PROT_ALL) # SRAM window
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uc.mem_write(BLOB_BASE, blob) # blob at 0xFF001000
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uc.mem_map(STACK_BASE, STACK_SIZE, UC_PROT_ALL)
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uc.mem_map(RET_STUB, RET_SIZE, UC_PROT_ALL)
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uc.mem_write(RET_STUB, b"\x00\x00\x20\xd4") # brk #0
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for base, sz, _ in MMIO:
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uc.mem_map(base, sz, UC_PROT_ALL)
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state = {"count": 0, "last_pc": 0, "same_pc": 0, "max_pc": 0}
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stub_word = int.from_bytes(bytes([stub_byte]) * 8, "little")
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def hook_code(uc, addr, size, ud):
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state["count"] += 1
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if addr == state["last_pc"]:
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state["same_pc"] += 1
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if state["same_pc"] > 5000:
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print(f"HANG at PC=0x{addr:x} after {state['count']} insns")
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uc.emu_stop()
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else:
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state["same_pc"] = 0
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state["last_pc"] = addr
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if addr > state["max_pc"]:
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state["max_pc"] = addr
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if state["count"] >= max_insn:
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print(f"LIMIT at PC=0x{addr:x} (max_pc=0x{state['max_pc']:x}, {state['count']} insns)")
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uc.emu_stop()
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if trace and state["count"] % 10000 == 0:
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print(f"[{state['count']}] PC=0x{addr:x}")
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def stub_value(addr):
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# Exact-address overrides first
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if addr in ABS_STUB:
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return ABS_STUB[addr]
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# Region + offset patterns
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for rbase, rend, mask, off_val, ret_val in REGION_OFF:
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if rbase <= addr < rend and (addr & mask) == off_val:
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return ret_val
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# Whole-region constants
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for rbase, rend, ret_val in REGION_CONST:
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if rbase <= addr < rend:
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return ret_val
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# Fall through to constant-byte stub
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return stub_word
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mmio_reads = []
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def hook_mmio_read(uc, typ, addr, size, val, ud):
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v = stub_value(addr) & ((1 << (size * 8)) - 1)
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uc.mem_write(addr, v.to_bytes(size, "little"))
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if len(mmio_reads) < 50:
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mmio_reads.append((uc.reg_read(UC_ARM64_REG_PC), addr, v))
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uc.hook_add(UC_HOOK_CODE, hook_code, begin=SRAM_BASE, end=SRAM_BASE + SRAM_SIZE)
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for base, sz, _ in MMIO:
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uc.hook_add(UC_HOOK_MEM_READ, hook_mmio_read, begin=base, end=base + sz)
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# Catch any unmapped read/write and log what the blob wanted
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unmapped = []
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def hook_unmapped(uc, typ, addr, size, val, ud):
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pc = uc.reg_read(UC_ARM64_REG_PC)
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unmapped.append((pc, typ, addr, size, val))
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# Lazily map a 64KB page containing the address and stub it
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page = addr & ~0xFFFF
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try:
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uc.mem_map(page, 0x10000, UC_PROT_ALL)
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except UcError:
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pass
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v = stub_value(addr) & ((1 << (size * 8)) - 1)
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uc.mem_write(addr, v.to_bytes(size, "little"))
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return True # tell Unicorn to continue
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uc.hook_add(UC_HOOK_MEM_UNMAPPED, hook_unmapped)
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uc.reg_write(UC_ARM64_REG_SP, STACK_BASE + STACK_SIZE - 16)
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uc.reg_write(UC_ARM64_REG_X30, RET_STUB)
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try:
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uc.emu_start(BLOB_BASE + entry, RET_STUB, count=max_insn)
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except UcError as e:
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pc = uc.reg_read(UC_ARM64_REG_PC)
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print(f"EXC at PC=0x{pc:x}: {e} (max_pc=0x{state['max_pc']:x}, {state['count']} insns)")
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return 1
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print(f"HALT insns={state['count']} max_pc=0x{state['max_pc']:x}")
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print(f"--- first MMIO reads ({len(mmio_reads)}) ---")
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for pc, addr, v in mmio_reads[:20]:
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print(f" PC=0x{pc:x} RD 0x{addr:x} -> 0x{v:x}")
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if unmapped:
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print(f"--- unmapped accesses ({len(unmapped)}) ---")
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for pc, typ, addr, size, val in unmapped[:20]:
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print(f" PC=0x{pc:x} type={typ} 0x{addr:x} size={size}")
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return 0
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if __name__ == "__main__":
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ap = argparse.ArgumentParser()
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ap.add_argument("blob")
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ap.add_argument("--stub", default="0x00")
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ap.add_argument("--max", type=int, default=200_000)
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ap.add_argument("--trace", action="store_true")
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ap.add_argument("--entry", default="0x0", help="start PC (0x40 skips version check)")
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a = ap.parse_args()
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sys.exit(run(a.blob, int(a.stub, 0), a.max, a.trace, int(a.entry, 0)))
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