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fold/third_party/ghidra-decompiler/specs/x86/x86win.cspec
trvon c08081a016
 feat: vendor x86-64 + 32-bit SLEIGH; precise SSA def-use; write-loop FP guard 
Unlocks the x86 family end-to-end and makes the write-loop detector precise
enough for statically-linked binaries.

x86 SLEIGH:
- Vendor Ghidra's x86 language specs (specs/x86, x86:LE:64:default + :32:default);
  add x86-64/x86 .sla build targets. archSpecFor maps x86/64 + x86/32.
- ghidra_lifter: set the x86-64 decode context (longMode/addrsize/opsize) in the
  raw path, and bound decompiler flow at the function end (0xC3 tail fill) so
  variable-length x86 does not run away into zero padding.

Precise SSA def-use (benefits all arches):
- ir::pcode::PcodeOp gains in_def (defining-op index per input); the SSA lifter
  records real def-use. summarizePointerWrites now resolves the store-address
  base via def-use instead of a last-write heuristic — essential on x86 where
  arg registers are reused as scratch (RAX) and sub-registers are written (SIL).
- paramIndexOf is arch-aware (AArch64 x0–x7; SysV x86-64 RDI/RSI/RDX/RCX/R8/R9).

Precision (the key fix at scale):
- A copy bounded by a size *parameter* (memcpy-like `for i<n`) is suppressed:
  if the loop index is `<`-compared against a pure parameter input, the function
  is size-bounded and not flagged. baby_bof's decode_base64 bounds on
  strlen(input) (a computed value, not a param) so it still fires. This cut a
  statically-linked x86-64 binary from 101 findings (≈100 glibc/libstdc++ FPs)
  to 1 — the real decode_base64 → 264-byte overflow.

Perf + reach:
- Cache the pre-pass SSA lift and reuse it in the main pass (re-lifting only the
  few callers of a write-loop callee that need the injected prototype).
- Give whole-binary r2 analysis a generous timeout (FOLD_R2_ANALYSIS_TIMEOUT_MS,
  default 120s) so large static binaries actually analyze (the 3s per-command
  watchdog left them with an empty function list).

Validated: decode_base64 overflow fires on x86-64 (index_amd64.cgi) and AArch64
(index_nocanary.cgi); AArch64 corpus BOF counts unchanged (3/1/1); x86-64 static
FP 101→1. Unit: test_pcode_summary +x86-64 case (9 assertions). meson test 77/77.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-01 10:34:28 -04:00

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<?xml version="1.0" encoding="UTF-8"?>
<compiler_spec>
<data_organization>
<absolute_max_alignment value="0" /> <!-- no maximum alignment -->
<machine_alignment value="8" />
<default_alignment value="1" />
<default_pointer_alignment value="4" />
<pointer_size value="4" />
<wchar_size value="2" />
<short_size value="2" />
<integer_size value="4" />
<long_size value="4" />
<long_long_size value="8" />
<float_size value="4" />
<double_size value="8" />
<long_double_size value="8" />
<size_alignment_map>
<entry size="1" alignment="1" />
<entry size="2" alignment="2" />
<entry size="4" alignment="4" />
<entry size="8" alignment="8" />
</size_alignment_map>
<bitfield_packing>
<use_MS_convention value="true"/>
</bitfield_packing>
</data_organization>
<global>
<range space="ram"/>
<register name="MXCSR"/>
</global>
<stackpointer register="ESP" space="ram"/>
<returnaddress>
<varnode space="stack" offset="0" size="4"/>
</returnaddress>
<default_proto>
<prototype name="__stdcall" extrapop="unknown" stackshift="4">
<input>
<pentry minsize="1" maxsize="500" align="4">
<addr offset="4" space="stack"/>
</pentry>
</input>
<output killedbycall="true">
<pentry minsize="4" maxsize="10" metatype="float" extension="float">
<register name="ST0"/>
</pentry>
<pentry minsize="1" maxsize="4">
<register name="EAX"/>
</pentry>
<pentry minsize="5" maxsize="8">
<addr space="join" piece1="EDX" piece2="EAX"/>
</pentry>
</output>
<unaffected>
<varnode space="ram" offset="0" size="4"/>
<register name="ESP"/>
<register name="EBP"/>
<register name="ESI"/>
<register name="EDI"/>
<register name="EBX"/>
<register name="DF"/>
<register name="FS_OFFSET"/>
</unaffected>
<killedbycall>
<register name="ECX"/>
<register name="EDX"/>
<register name="ST0"/>
<register name="ST1"/>
</killedbycall>
<likelytrash>
<register name="ECX"/>
</likelytrash>
</prototype>
</default_proto>
<prototype name="__cdecl" extrapop="4" stackshift="4">
<input>
<pentry minsize="1" maxsize="500" align="4">
<addr offset="4" space="stack"/>
</pentry>
</input>
<output killedbycall="true">
<pentry minsize="4" maxsize="10" metatype="float" extension="float">
<register name="ST0"/>
</pentry>
<pentry minsize="1" maxsize="4">
<register name="EAX"/>
</pentry>
<pentry minsize="5" maxsize="8">
<addr space="join" piece1="EDX" piece2="EAX"/>
</pentry>
</output>
<unaffected>
<varnode space="ram" offset="0" size="4"/>
<register name="ESP"/>
<register name="EBP"/>
<register name="ESI"/>
<register name="EDI"/>
<register name="EBX"/>
<register name="DF"/>
<register name="FS_OFFSET"/>
</unaffected>
<killedbycall>
<register name="ECX"/>
<register name="EDX"/>
<register name="ST0"/>
<register name="ST1"/>
</killedbycall>
<likelytrash>
<register name="ECX"/>
</likelytrash>
</prototype>
<prototype name="__fastcall" extrapop="unknown" stackshift="4">
<input>
<pentry minsize="1" maxsize="4">
<register name="ECX"/>
</pentry>
<pentry minsize="1" maxsize="4">
<register name="EDX"/>
</pentry>
<pentry minsize="1" maxsize="500" align="4">
<addr offset="4" space="stack"/>
</pentry>
</input>
<output killedbycall="true">
<pentry minsize="4" maxsize="10" metatype="float" extension="float">
<register name="ST0"/>
</pentry>
<pentry minsize="1" maxsize="4">
<register name="EAX"/>
</pentry>
<pentry minsize="5" maxsize="8">
<addr space="join" piece1="EDX" piece2="EAX"/>
</pentry>
</output>
<unaffected>
<varnode space="ram" offset="0" size="4"/>
<register name="ESP"/>
<register name="EBP"/>
<register name="ESI"/>
<register name="EDI"/>
<register name="EBX"/>
<register name="DF"/>
<register name="FS_OFFSET"/>
</unaffected>
<killedbycall>
<register name="ECX"/>
<register name="EDX"/>
<register name="ST0"/>
<register name="ST1"/>
</killedbycall>
<likelytrash>
<register name="ECX"/>
</likelytrash>
</prototype>
<prototype name="__thiscall" extrapop="unknown" stackshift="4">
<input thisbeforeretpointer="true">
<pentry minsize="1" maxsize="4">
<register name="ECX"/>
</pentry>
<pentry minsize="1" maxsize="500" align="4">
<addr offset="4" space="stack"/>
</pentry>
</input>
<output killedbycall="true">
<pentry minsize="4" maxsize="10" metatype="float" extension="float">
<register name="ST0"/>
</pentry>
<pentry minsize="1" maxsize="4">
<register name="EAX"/>
</pentry>
<pentry minsize="5" maxsize="8">
<addr space="join" piece1="EDX" piece2="EAX"/>
</pentry>
</output>
<unaffected>
<varnode space="ram" offset="0" size="4"/>
<register name="ESP"/>
<register name="EBP"/>
<register name="ESI"/>
<register name="EDI"/>
<register name="EBX"/>
<register name="DF"/>
<register name="FS_OFFSET"/>
</unaffected>
<killedbycall>
<register name="ECX"/>
<register name="EDX"/>
<register name="ST0"/>
<register name="ST1"/>
</killedbycall>
<likelytrash>
<register name="ECX"/>
</likelytrash>
</prototype>
<resolveprototype name="__fastcall/__thiscall/__stdcall">
<model name="__stdcall"/> <!-- The default case -->
<model name="__fastcall"/>
<model name="__thiscall"/>
</resolveprototype>
<eval_current_prototype name="__fastcall/__thiscall/__stdcall"/>
<!-- Injections for various compiler helper functions -->
<callfixup name="EH_prolog">
<target name="__EH_prolog"/>
<target name="_EH_prolog"/>
<target name="thunk_EH_prolog"/>
<pcode>
<body><![CDATA[
ESP = ESP - 4;
*:4 ESP = -1;
ESP = ESP - 4;
* ESP = EAX;
EAX = * FS_OFFSET;
ESP = ESP - 4;
* ESP = EAX;
* FS_OFFSET = ESP;
tmp = ESP + 12;
* tmp = EBP;
EBP = tmp;
]]></body>
</pcode>
</callfixup>
<callfixup name="EH_prolog3">
<target name="_EH_prolog3"/>
<target name="__EH_prolog3"/>
<target name="EH_prolog3_GS"/>
<target name="_EH_prolog3_GS"/>
<target name="__EH_prolog3_GS"/>
<target name="EH_prolog3_catch"/>
<target name="_EH_prolog3_catch"/>
<target name="__EH_prolog3_catch"/>
<target name="EH_prolog3_catch_GS"/>
<target name="_EH_prolog3_catch_GS"/>
<target name="__EH_prolog3_catch_GS"/>
<target name="EH_prolog3_catch"/>
<target name="_EH_prolog3_catch"/>
<target name="__EH_prolog3_catch"/>
<target name="EH_prolog3_catch_GS"/>
<target name="_EH_prolog3_catch_GS"/>
<target name="__EH_prolog3_catch_GS"/>
<pcode>
<body><![CDATA[
EBP = ESP + 4;
tmp = * EBP;
ESP = ESP - tmp;
ESP = ESP - 24;
]]></body>
</pcode>
</callfixup>
<callfixup name="EH_epilog3">
<target name="_EH_epilog3"/>
<target name="__EH_epilog3"/>
<target name="EH_epilog3_GS"/>
<target name="_EH_epilog3_GS"/>
<target name="__EH_epilog3_GS"/>
<target name="EH_epilog3_catch"/>
<target name="_EH_epilog3_catch"/>
<target name="__EH_epilog3_catch"/>
<target name="EH_epilog3_catch_GS"/>
<target name="_EH_epilog3_catch_GS"/>
<target name="FID_conflict:__EH_epilog3_GS"/>
<target name="FID_conflict:__EH_epilog3_catch"/>
<target name="FID_conflict:__EH_epilog3_catch_GS"/>
<target name="SEH_epilog"/>
<target name="_SEH_epilog"/>
<target name="__SEH_epilog"/>
<target name="SEH_epilog4"/>
<target name="_SEH_epilog4"/>
<target name="__SEH_epilog4"/>
<target name="SEH_epilog4_GS"/>
<target name="_SEH_epilog4_GS"/>
<target name="__SEH_epilog4_GS"/>
<target name="FID_conflict:__SEH_epilog4_GS"/>
<pcode>
<body><![CDATA[
ESP = EBP;
EBP = * ESP;
ESP = ESP + 4;
]]></body>
</pcode>
</callfixup>
<!-- Not sure if these are ever used, and how they affect the stack
<callfixup name="EH_prolog3_align">
<target name="_EH_prolog3_align"/>
<target name="__EH_prolog3_align"/>
<target name="EH_prolog3_GS_align"/>
<target name="_EH_prolog3_GS_align"/>
<target name="__EH_prolog3_GS_align"/>
<target name="EH_prolog3_catch_align"/>
<target name="_EH_prolog3_catch_align"/>
<target name="__EH_prolog3_catch_align"/>
<target name="EH_prolog3_catch_GS_align"/>
<target name="_EH_prolog3_catch_GS_align"/>
<target name="__EH_prolog3_catch_GS_align"/>
<pcode>
<body><![CDATA[
EBP = ESP + 4;
tmp = * EBP;
ESP = ESP - tmp;
ESP = ESP - 24;
]]></body>
</pcode>
</callfixup>
<callfixup name="EH_epilog3_align">
<target name="_EH_epilog3_align"/>
<target name="__EH_epilog3_align"/>
<target name="EH_epilog3_GS_align"/>
<target name="_EH_epilog3_GS_align"/>
<target name="__EH_epilog3_GS_align"/>
<pcode>
<body><![CDATA[
ESP = EBP;
EBP = * ESP;
ESP = ESP - 4;
]]></body>
</pcode>
</callfixup>
-->
<callfixup name="alloca_probe">
<target name="__alloca_probe"/>
<target name="__alloca_probe_8"/>
<target name="__alloca_probe_16"/>
<target name="__chkstk"/>
<pcode>
<body><![CDATA[
ESP = ESP + 4 - EAX;
]]></body>
</pcode>
</callfixup>
<callfixup name="SEH_prolog">
<target name="_SEH_prolog"/>
<target name="__SEH_prolog"/>
<pcode>
<body><![CDATA[
newframetmp = ESP + 8;
localsizetmp:4 = * newframetmp;
ESP = ESP - localsizetmp;
ESP = ESP - 20;
* newframetmp = EBP;
EBP = newframetmp;
*ESP = EDI;
*(ESP+4) = ESI;
*(ESP+8) = EBX;
]]></body>
</pcode>
</callfixup>
<callfixup name="SEH_prolog4">
<target name="_SEH_prolog4"/>
<target name="__SEH_prolog4"/>
<target name="SEH_prolog4_GS"/>
<target name="_SEH_prolog4_GS"/>
<target name="__SEH_prolog4_GS"/>
<pcode>
<body><![CDATA[
newframetmp = ESP + 8;
localsizetmp:4 = * newframetmp;
ESP = ESP - localsizetmp;
ESP = ESP - 24;
* newframetmp = EBP;
EBP = newframetmp;
*(ESP+4) = EDI;
*(ESP+8) = ESI;
*(ESP+12) = EBX;
]]></body>
</pcode>
</callfixup>
<callfixup name="__RTC_CheckEsp">
<target name="__RTC_CheckEsp"/>
<pcode>
<body><![CDATA[
temp:4 = 0;
]]></body>
</pcode>
</callfixup>
<callfixup name="security_check_cookie">
<target name="__security_check_cookie"/>
<pcode>
<body><![CDATA[
tmpzero:4 = 0;
]]></body>
</pcode>
</callfixup>
</compiler_spec>
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