* feat(ghidra): admit recordless legacy MIPS32 ELFs with a pinned 32-bit language
Firmware built with pre-ABI-flags GNU toolchains declares EF_MIPS_ARCH_32
with an unspecified ABI field and no PT_MIPS_ABIFLAGS record. The lane
refused them before provider selection, and Ghidra's own header
auto-selection picks a 64-bit R6 language for exactly these files.
Admit ELF32 ET_EXEC headers with EF_MIPS_ARCH_32 or EF_MIPS_ARCH_32R2,
an unspecified ABI field, EF_MIPS_ABI2 clear and no observed ABI flags
record. o32 is recorded as an inferred analysis assumption
(mips_abi_basis), floating-point ABI semantics stay unverified, and the
existing refusals (FP64, NAN2008, ASEs, machine variants, ELF64) are
unchanged. The profile pins -processor MIPS:<LE|BE>:32:default through a
provider-pinned-v1 selection the bridge-reported language_id is checked
against after import; a caller-selected REA_GHIDRA_LANGUAGE_ID still
wins. The lane identity is versioned
elf32-exec-arch32-legacy-pinned-v1.
verify:ghidra:mips gains a recordless legacy round for both byte orders
that strips the ABI record declarations from a real mips32 fixture,
checks REA's interpretation against GNU readelf, asserts the pinned
language after import and the retained assumption limitations through a
snapshot round-trip.
Fixes#1620
* fix(ghidra): require an inspected absence for the recordless MIPS lane
Address review: undefined ABI flags means the record was not inspected,
not that none exists. Only an inspected absence (null) establishes the
recordless legacy admission; a merely unobserved record keeps its
specific refusal. Also document the legacy admission and its pinned
language in the MIPS provider guide.
* fix(ghidra): tighten the recordless MIPS admission boundaries
Address review: a recordless-looking header whose ABI-record inspection
left declaration sources unexamined (carved ELF with a partial section
table and no program-header record) no longer establishes the recordless
admission; it is refused with the inspection limitation retained. An
EF_MIPS_ARCH_32 header that declares an ABI is refused rather than
relabeled through the 32R2 declared-ABI lane.
* fix(ghidra): reject EF_MIPS_ABI_ON32 from the recordless MIPS lane
Address review: bit 0x40 declares the old n32 ABI. A recordless header
carrying it was admitted with the inferred-o32 assumption even though
the header itself declares n32; the recordless shape now requires the
bit clear and refuses it with a specific constraint.
* fix(ghidra): keep recordless relocatable MIPS objects off the legacy lane
The recordless admission now requires ET_EXEC: the lane and its
verification cover executable firmware images, and a recordless ET_REL
object must stay on the declared-ABI path instead of inheriting the
inferred-o32 assumption under an executable lane id. The ABI-record
requirement paragraph is scoped to the declared-ABI lane so it no longer
contradicts the recordless admission documented above it.
* fix(ghidra): name the ET_EXEC scope for recordless objects and probe the legacy lane
A recordless relocatable object is not an incomplete inspection, so its
refusal now names the ET_EXEC scope of the legacy admission instead of
claiming unavailable ABI headers remain unknown. The recordless legacy
verifier round reads the probe pair and applies the full assertMipsProbe
oracle like the standard round, and its report keeps the independent
GNU readelf receipt beside the fixture facts.
* fix(ghidra): retain the concrete ELF32 legacy compiler pin
* fix(ghidra): bind legacy profiles to fully admitted targets
---------
Co-authored-by: BaaRai <baarai@users.noreply.github.com>
Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
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