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Adrià 2816bd2754 Merge pull request #9600 from shahulmubeen-a/fix/agc-register-list-any-byte 
fix(libSceAgc): accept register lists at any byte address
2026-10-25 09:16:21 +01:00

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# libSceAgc technical debt
### Unknown function info
- [sceAgcDcbSetCfRegisterDirect, sceAgcDcbSetCfRegisterRangeDirect](../../../core/libs/prx/libSceAgc/DcbState/src/Registers.cpp) (libSceAgc) - signatures follow [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) and [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/main/src/SharpProspero/Interop/Agc/SceAgc.cs), which agree; the SET_CONFIG_REG (0x68) packet is OpenAGC's. The driver does not execute SET_CONFIG_REG, so a submitted packet throws
- [Command buffer cursors](../../../core/libs/prx/libSceAgc/Command/src/Packet.cpp) (libSceAgc) - a null `cursor_down` is taken as a buffer without downward allocations, whose limit is `top`. PPSA16064 builds one-packet buffers of 8 dwords that way; the console's handling is unconfirmed
- [sceAgcGetRegisterDefaultsInternal](../../../core/libs/prx/libSceAgc/Misc/src/RegisterDefaults.cpp) (libSceAgc) - returns the version 0 internal table while `sceAgcGetRegisterDefaults` now returns the version 13 public one; which internal table a console returns is not known. [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) returns the table of the version passed to `sceAgcInit` instead, and null before it
- [sceAgcGetRegisterDefaults](../../../core/libs/prx/libSceAgc/Misc/src/RegisterDefaults.cpp) (libSceAgc) - returns the version 13 public table (137 keyed entries over 84 context blocks) because the console returns the running system software's table: [ps5-vulkan](https://github.com/mpereiraesaa/ps5-vulkan/blob/4bb0c8b1423698a7369efc22b829bf16a99e7128/src/color_runtime_defaults.h) measured 128 entries over 79 blocks on 10.x and 137 over 84 on 12.02 and 13.x, the shapes of the version 10 and version 11/13 tables here, and PPSA99011 refuses the version 0 table. The [type table](../../../core/libs/prx/libSceAgc/Command/src/RegisterDefaults.cpp) is handed out as 8-byte `{key, index << 2 | bank}` pairs, the layout ps5-vulkan and the homebrew sharing its `ps5_agc_registers.h` read; the compact 12-byte entries also pack the block's register count and stride above bit 10, and those bits are dropped. `sceAgcGetRegisterDefaults2`, `sceAgcGetRegisterDefaults2Internal`, `sceAgcGetRegisterDefaultsInternal` and `sceAgcInit` hand out the compact 12-byte entries (`RegisterDefaultsTypeLayout::Compact`): SDK-built code walks the tables of the first two with a 12-byte stride, reads the key at +0 and the bank and index from the low 10 bits of the word at +4, and keeps an all-ones sentinel for a key it does not find. Which layout the legacy internal call returns on a console is not known. No console dump of the runtime type table was compared, and AnyPS5 does not choose 10.x or 12.02 by the system software a title targets
- [sceAgcInit](../../../core/libs/prx/libSceAgc/DcbState/src/Init.cpp) (libSceAgc) - versions 0–13 select their register-default tables and return 0; pointer-shaped or otherwise out-of-range values (>=14) return 0 without a register-default lookup. Console probe on firmware 13.60 ([#4808](https://github.com/boykopovar/AnyPS5/issues/4808#issuecomment-6149448503)): `sceAgcInit(&buf, 8)` (NID `kW3GLb7QfPg`) returns 0 and writes nothing; scalar versions 2–13 return `0x8A6C0004` there, while AnyPS5 still returns 0 for those scalars. The probe does not show that table 13 is selected for pointer-shaped calls. [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) returns `0x80890001` above 12 for `sceAgcInit`, and falls back to version 11 in `sceAgcGetRegisterDefaults2`. PPSA99011, PPSA99995, [ps5-vulkan](https://github.com/mpereiraesaa/ps5-vulkan) and [prospero-win](https://github.com/mpereiraesaa/prospero-win) call that NID with a pointer-shaped first argument. `sceAgcInit_0090` (NID `23LRUSvYu1M`) checks the state pointer and then calls `sceAgcInit`, as OpenAGC does
- [sceAgcSetSubmitMode](../../../core/libs/prx/libSceAgc/Misc/src/Suspend.cpp) (libSceAgc) - mode values unknown; only 0 is accepted
- [sceAgcGetGsOversubscription](../../../core/libs/prx/libSceAgc/Shader/src/GsOversubscription.cpp) (libSceAgc) - signature and occupancy formula (base and expanded vertex/export capacities, budget shift, `GE_PC_ALLOC` / `SPI_SHADER_PGM_RSRC4_GS` encoding) follow KytyPS5 only, not confirmed on hardware or a title; a negative or NaN factor that gives a negative target, a missing GS context register or a zero `GE_MAX_OUTPUT_PER_SUBGROUP` throws
- [sceAgcGetGsPrimPayload](../../../core/libs/prx/libSceAgc/Shader/src/GsPrimPayload.cpp) (libSceAgc) - the search does not stop at an `SPI_SHADER_IDX_FORMAT` (0x1C2) entry whose format is not `SPI_SHADER_2COMP`, as the analysis of the library declared in the pull request describes (its origin and firmware version are not identified), while [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c#L1285-L1310) stops there; not verified on PS5 hardware. A null payload, a null shader or a register count with a null register array throws instead of faulting on the memory access
- [sceAgcCbCondWrite](../../../core/libs/prx/libSceAgc/Cb/src/Branch.cpp) (libSceAgc) - argument order and the 9-dword COND_WRITE layout follow the clean-room [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) and [sharpemu](https://github.com/sharpemu/sharpemu/blob/main/src/SharpEmu.Libs/Agc/AgcExports.CommandPackets.cs), which agree on them; SharpProspero lists another order. The write space is accepted only as 1 (memory), the one value both encode the same way, and other values throw.
- [sceAgcAcbAtomicGds_0900](../../../core/libs/prx/libSceAgc/Acb/src/Control.cpp) (libSceAgc) - signature, control/mode bit mapping and the 11-dword ATOMIC_GDS (0x1d) layout follow the clean-room [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c) only, which derives them from the library's disassembly; KytyPS5 and shadPS4 have no body for it. Not confirmed on hardware or a title (PPSA07286 imports it, nothing was run), and the driver has no ATOMIC_GDS handler (opcode 0x1d is not executed as an atomic GDS operation)
- [sceAgcGetIsTrinityMode](../../../core/libs/prx/libSceAgc/Misc/src/Platform.cpp) (libSceAgc) - signature from the only PPSA26344 call (a pointer to a one-byte flag, result ignored); a null pointer throws because its error code is unknown
- [sceAgcDcbAtomicGds_0900](../../../core/libs/prx/libSceAgc/DcbFlow/src/Control.cpp) (libSceAgc) - and `sceAgcDcbAtomicGds` (forwards to it) - signature, control/mode bit mapping and the 11-dword ATOMIC_GDS (0x1d) layout are those of `sceAgcAcbAtomicGds_0900`, which follow the clean-room [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c) only; KytyPS5 and shadPS4 have no body for it. Not confirmed on hardware or a title, and the driver has no ATOMIC_GDS handler
- [sceAgcDcbContextStateOpGetSize](../../../core/libs/prx/libSceAgc/DcbState/src/ContextState.cpp) (libSceAgc) - sizes from KytyPS5 only (5, 27, 27 and 32 dwords), equal to what `sceAgcDcbContextStateOp_0100` writes; KytyPS5 returns 0 for an operation above 3, here it throws
- [sceAgcDcbContextStateOp](../../../core/libs/prx/libSceAgc/DcbState/src/ContextState.cpp) (libSceAgc) - delegates to `sceAgcDcbContextStateOp_0100` (same packets as KytyPS5's `AgcDcbContextStateOp`); KytyPS5 returns nullptr for an operation above 3, here it throws; the packet words were not compared with a real console
- [sceAgcBranchPatchSetThenTarget_0300, sceAgcBranchPatchSetElseTarget_0300](../../../core/libs/prx/libSceAgc/Patch/src/Branch.cpp) (libSceAgc) - names from their NIDs (`7Wa3aeJgeVU`, `rP5xLdOf26k`); the `(packet, cachePolicy, target, sizeInDwords)` signature is inferred from PPSA28416's calls (a branch packet, 0, an aligned target, 4), with the policy stored where `sceAgcCbBranch` puts it
- [sceAgcDcbSet{Cx,Sh,Uc}RegistersIndirectGetSize](../../../core/libs/prx/libSceAgc/DcbState/src/Registers.cpp) (libSceAgc) - the count argument is ignored: PPSA28416 calls them with leftover register contents (0xf5f5039c), so the real functions likely take none; the size is 20 bytes either way
- [sceAgcCbSetShRegistersDirect, sceAgcCbSetUcRegistersDirect](../../../core/libs/prx/libSceAgc/Cb/src/Registers.cpp) (libSceAgc) - a register list may start at any byte address, and its 8-byte `{offset, value}` entries are copied byte for byte. PPSA26344 (02.002.000) passes the `sh_registers` lists of compute shader headers that sit 1 byte past an 8-byte boundary in `core_common_subcore.core_b1_fx.sprig.xpps` ([#902](https://github.com/boykopovar/AnyPS5/pull/902)), so those lists start at 1 mod 4 (0x8021363131 in an open-world run). The title runs on the console with these lists, but how the console reads an unaligned list (at the given address, or at a rounded-down one) is not measured
- [sceAgcUpdateInterpolantMapping_0100](../../../core/libs/prx/libSceAgc/Misc/src/ShaderFusion.cpp) (libSceAgc) - name from its NID (`k0E7vkgqAuE`); the `(regs, vs, ps)` arguments are the declared ones, behaviour unknown
- [sceAgcWriteDataPatchSetDst, sceAgcWriteDataPatchSetCachePolicy and their Async forms](../../../core/libs/prx/libSceAgc/Patch/src/WaitRegMem.cpp) (libSceAgc) - the signatures `(packet, uint8 value)` are inferred from the other patch functions, as no public declaration was found; the value is taken in the encoding of the `dst` and `cachePolicy` arguments of `sceAgcDcbWriteData` (graphics) and `sceAgcAcbWriteData` (Async, compute), and the patched packet is the one those calls would write. `sceAgcAsyncWriteDataPatchSetAddressOrOffset` is assumed to patch the address like `sceAgcWriteDataPatchSetAddressOrOffset`, as the compute WRITE_DATA packet keeps it in the same dwords
- [sceAgcCreateInterpolantMapping_10000](../../../core/libs/prx/libSceAgc/Shader/src/InterpolantMapping.cpp) (libSceAgc) - name from its NID (`dbOlWdppb4o`); same arguments as `sceAgcCreateInterpolantMapping_0100`; PPSA26344 passes three pointers at each of nine observed call sites (`0x9F914E`, `0x9F91E2`, `0x9F9216`, `0x1604BBD`, `0x16122D7`, `0x1618285`, `0x161838C`, `0x16184EE`, `0x1618607`), consistent with that argument assumption, but does not read the return value there, so its return type is not established.
- [sceAgcGetDataPacketPayloadRange](../../../core/libs/prx/libSceAgc/Misc/src/PacketInfo.cpp) (libSceAgc) - signature, the `{base, size in bytes}` output and the type 0 range (header + 1, one dword longer than the type 1 payload) from KytyPS5 only, matching `sceAgcGetDataPacketPayloadAddress_0090`; prosper returns header + 2 for both types from that address function
- [sceAgcGetDataPacketPayloadAddress](../../../core/libs/prx/libSceAgc/Misc/src/PacketInfo.cpp) (libSceAgc) - forward to `sceAgcGetDataPacketPayloadAddress_0090` and the inferred (addr, cmd, type) parameters follow SharpProspero and decrypted firmware 3.20 NID mapping; not verified on console hardware
- [sceAgcAcbMemSemaphore, sceAgcDcbMemSemaphore](../../../core/libs/prx/libSceAgc/Acb/src/Sync.cpp) (libSceAgc) - signature (cb, semaphoreAddr, waitForMailbox, signalType, operation) inferred from PPSA03396, whose wrapper passes the address second and operation 6 (signal) or 7 (wait) last; the three trailing arguments go to the packet as-is
- [sceAgcCbMemSemaphore](../../../core/libs/prx/libSceAgc/Cb/src/Sync.cpp) (libSceAgc) - signature (cb, semaphoreAddr, operation, modifier, value) follows SharpProspero; writes 4-dword PM4 0x39 packet with control word 0x80100000 following console oracle measurements in prosper (cases agcbuild_CbMemSemaphore_a/b/c); operation, modifier and value are unused
- [sceAgcAsyncCondExecPatchSetCommandAddress, sceAgcAsyncCondExecPatchSetEnd](../../../core/libs/prx/libSceAgc/Patch/src/CondExec.cpp) (libSceAgc) - no reference has a body for them; they are assumed to patch the COND_EXEC packet like `sceAgcCondExecPatchSetCommandAddress` and `sceAgcCondExecPatchSetEnd`, since `sceAgcAcbCondExec` writes the same packet as `sceAgcDcbCondExec`, as `sceAgcAsyncRewindPatchSetRewindState` does for REWIND
- [sceAgcAcbAtomicGds_0900](../../../core/libs/prx/libSceAgc/Acb/src/Control.cpp) (libSceAgc) - name from its NID (`gQkqkLttcpw`)
- [sceAgcDcbPrimeUtcl2](../../../core/libs/prx/libSceAgc/DcbState/src/Display.cpp) (libSceAgc) - assumed to write the packet `sceAgcAcbPrimeUtcl2` writes: PRIME_UTCL2 has the same 5 dwords on the graphics and compute rings. Not confirmed on a title. Both write a NOP of that size, as there is no TLB to prime
- [sceAgcDcbQueueEndOfShaderActionGetSize](../../../core/libs/prx/libSceAgc/DcbState/src/ContextState.cpp) (libSceAgc) - the builder is inline in the SDK and not exported; the size is assumed to be that of the RELEASE_MEM packet `sceAgcCbReleaseMem` writes (32 bytes), the same as `sceAgcAcbQueueEndOfShaderActionGetSize`, as in [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) and [REmu](https://github.com/xnetcat/REmu/blob/main/crates/remu-runtime/src/agc_dcb.rs)
- [sceAgcDcbSetZPassPredicationEnableGetSize, sceAgcDcbSetPredicationDisableGetSize, sceAgcDcbSetBoolPredicationEnableGetSize](../../../core/libs/prx/libSceAgc/DcbState/src/Predication.cpp) (libSceAgc) - the builders are inline in the SDK and not exported; the size is assumed to be that of the SET_PREDICATION packet `sceAgcDcbSetPredication` writes (16 bytes)
- [sceAgcAcbWaitUntilSafeForRendering](../../../core/libs/prx/libSceAgc/Acb/src/Control.cpp) (libSceAgc) - `(buffer, videoOutHandle, displayBufferIndex)`, the declared arguments, which PPSA12544 (01.000.010) passes inside `waitUntilSafeForRendering` and `waitUntilSafeForRendering VR` markers on an asynchronous compute command buffer, ignoring the result. It writes the same rendering-wait packet as `sceAgcDcbWaitUntilSafeForRendering`, which the driver now accepts on compute queues too; the wait blocks only that queue's worker. Whether the console encodes the compute variant differently is not known
- [sceAgcGetDefaultCxStateFlat](../../../core/libs/prx/libSceAgc/Misc/src/RegisterDefaults.cpp) (libSceAgc) - copies up to `size` bytes (clamped to 2048 bytes, the 512-dword `AgcContextState`) from the default context state initialized from the version 8 public register default groups (CX, SH, UC), indexed by register offset, following OpenAGC `src/context_state.c`; returns `0x80890001` on null destination; version selection without `sceAgcInit` is unverified
- [sceAgcDcbSetIndexIndirectArgs, sceAgcDcbSetIndexIndirectArgsGetSize](../../../core/libs/prx/libSceAgc/DcbDraw/src/IndexBuffer.cpp) (libSceAgc) - the `(buffer, attributeAddress, attributeIndex)` signature, a 64-bit address and a 32-bit index, is [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c#L1742-L1757)'s. The console oracle in prosper measured the packet, an INDEX_ATTRIBUTES_INDIRECT (opcode 0x91) holding the low address dword, the high address dword and the index ([measured](https://github.com/mattias800/prosper/blob/3ea5cb9a846b6dcd00f5073360462bbda4f72288/prosper/tests/data/console_oracle/agcbuild.golden.tsv#L172-L174)), and a size of 16 bytes ([measured](https://github.com/mattias800/prosper/blob/3ea5cb9a846b6dcd00f5073360462bbda4f72288/prosper/tests/data/console_oracle/agc.golden.tsv#L67)). The console clears the low four address bits and keeps the low 16 bits of the index; here a nonzero address that is not 16-byte aligned, or an index above 0xffff, throws, as `sceAgcDcbSetIndexBuffer` throws for a misaligned address. A null address is written as 0, as the console writes it. No title is known to call them.
- [sceAgcSuspendPointAndCheckStatus](../../../core/libs/prx/libSceAgc/Export.cpp) - this named callable export is listed in the [PS5 3.20 export table](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceAgc.c) and was cross-checked against the same module in PS5 firmware 13.60. Its signature and behaviour are unverified; the declaration uses the no-parameter unknown-signature convention and throws through `NotImplemented_nid_no_patch`.
### Functional
- [sceAgcDebugRaiseException](../../../core/libs/prx/libSceAgc/Misc/src/Debug.cpp) (libSceAgc) - logs the exception id and returns 0, as retail hardware does nothing per [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c); the trap (`ud2`) OpenAGC describes for development hardware is not reproduced. Neither is verified on a console. The `uint32` exception id is [KytyPS5](https://github.com/KytyPS5/KytyPS5/blob/6f0cddd4404ec5203e71fea77e75fc373299ba3f/src/libs/agc.cpp)'s claim; OpenAGC declares no arguments, so the logged id may be leftover register contents
- [sceAgcSetAmmSemaphoreMemory, sceAgcSetSemaphoreMemory, sceAgcGetSemaphoreLabel](../../../core/libs/prx/libSceAgc/Misc/src/Semaphore.cpp) (libSceAgc) - the checks, error codes and clearing are the firmware's, but two firmware steps are not reproduced. After its checks, the firmware validates the memory with libkernel `qSleeVC6lwI`: an ioctl `0xc018ac15` taking `{memory, size, 1}`. The AMM call always does this; the non-AMM call only for memory from 8 TiB up that ends below 15 TiB. The firmware then sends `{7: memory, 8: size, 0xb: 0 for AMM, 1 otherwise}` through sceAgcDriverPassInfoDownward. Neither step happens here, so a registration that the kernel or driver would refuse succeeds. A null memory with a non-zero size and a range that wraps the address space throw where the firmware would fault
- [sceAgcDcbSetWorkloadsActive and sceAgcDcbSetWorkloadComplete](../../../core/libs/prx/libSceAgc/DcbState/src/Workload.cpp) (libSceAgc) - the DCB calls write the packets [KytyPS5](https://github.com/KytyPS5/KytyPS5/blob/main/src/libs/agc.cpp) writes: an 18-dword (active) or 12-dword (complete) `IT_NOP` packet with the stream id, and for active the 64-bit mask of the workload ids, for complete the workload id and the 64-bit clear mask of that id. Both return null for a null command buffer, an unregistered or out-of-range stream, a workload id above 63, and for active a duplicate id or a count of 0 or above 63. The layouts and checks come from KytyPS5 alone; the console oracle in [prosper](https://github.com/mattias800/prosper/blob/main/prosper/tests/data/console_oracle/agcbuild.golden.tsv) measures the null return only for unregistered streams, not the packet contents of a registered one. PPSA29866 calls sceAgcDcbSetWorkloadsActive while building its command buffers (sceAgcDcbSetWorkloadComplete was not observed); nothing else was observed.
- [sceAgcDcbSetWorkloadStreamInactive](../../../core/libs/prx/libSceAgc/DcbState/src/Workload.cpp) and [sceAgcAcbSetWorkloadsActive, sceAgcAcbSetWorkloadComplete, sceAgcAcbSetWorkloadStreamInactive](../../../core/libs/prx/libSceAgc/Acb/src/Control.cpp) (libSceAgc) - return null without writing to the buffer for a null command buffer or a stream that is not registered (out-of-range ids included), and throw for a registered stream. The console oracle in prosper measured only that null return, with no stream registered, three argument patterns each and nothing written ([ACB](https://github.com/mattias800/prosper/blob/df074498e56c0df22d74f9c6622e4709bc1c9a19/prosper/tests/data/console_oracle/agcbuild.golden.tsv#L48-L56), [DCB](https://github.com/mattias800/prosper/blob/df074498e56c0df22d74f9c6622e4709bc1c9a19/prosper/tests/data/console_oracle/agcbuild.golden.tsv#L196-L204)); the packet a registered stream gets is not measured. KytyPS5 has no body for these four, and its `IT_NOP` layout for the DCB active and complete calls differs from the SET_UCONFIG_REG, WRITE_DATA and SET_WORKLOAD sequence [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/agc_workload_packet.c) derives from the driver, so neither is taken. The `(buf, streamId)`, `(buf, streamId, workloadId)` and `(buf, streamId, workloadIds, workloadCount)` signatures are those of the DCB calls in [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c#L2317-L2384), which says the ACB calls use the same driver builders; no ACB declaration was found. `sceAgcDcbSetWorkloadsActive` checks the stream before it reads the workload ids, as OpenAGC does: the console returned null for stream 1 with the ids at address 2 ([measured](https://github.com/mattias800/prosper/blob/df074498e56c0df22d74f9c6622e4709bc1c9a19/prosper/tests/data/console_oracle/agcbuild.golden.tsv#L203)) without faulting
- [sceAgcDcbSetWorkload*](../../../core/libs/prx/libSceAgc/DcbState/src/Workload.cpp) and [sceAgcAcbSetWorkload*](../../../core/libs/prx/libSceAgc/Acb/src/Control.cpp) (libSceAgc) - the console's packets are not written: the executor has no ATOMIC_MEM or mask table. In `libSceAgc.sprx` (firmware 12.00, read from disassembly) all six write a SET_UCONFIG_REG to 0x342 (tag `0xCC000000 | stream`, or `0xCD000000 + workload * 32 + stream` for complete) and a WRITE_DATA to 0xC343, and active and complete add an ATOMIC_MEM (header `0xC0071E00`) on the stream's 64-bit mask. [Measured on a PS5](https://gist.github.com/orezraey/befe7632b827421988b47a6c04e89e1d) (firmware 13.60): WRITE_DATA dwords 5 to 8 are `0x06010000`, `0xC343`, 0 and the mask's high half (0 for inactive); the header low byte is 0x04 on the DCB SET_UCONFIG_REG and WRITE_DATA and 0x00 on the ACB ones; the table was at `0xFE003A000 + 8 * stream`; the pointer passed to `sceAgcDriverRegisterWorkloadStream` is never written
- [sceAgcCreatePrimState](../../../core/libs/prx/libSceAgc/Shader/src/PrimState.cpp) (libSceAgc) - the `ge_user_vgpr_en` special is passed to the user configuration registers at whatever offset the shader header stores, as the SPRX does according to [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/3c7e8072f0d7684e930454794fd5c02056946d73/src/game_compat.c#L1181-L1252), which copies all four specials verbatim (KytyPS5 stops on any other offset). PPSA99039, PPSA99505, PPSA99515 and PPSA99997 build their headers by hand with it at 0x25c (`GE_USER_VGPR1`) instead of 0x262 (`GE_USER_VGPR_EN`), value 0, and run on the console; it is not moved to 0x262, and the driver reads neither register. `ge_cntl`, `vgt_shader_stages_en` and a used `vgt_gs_out_prim_type` must still be at their own offsets, since the driver reads those registers there, so a header that stores one elsewhere throws naming the offset, although by OpenAGC the SPRX would copy it as well
- [sceAgcDcbEventWrite](../../../core/libs/prx/libSceAgc/DcbFlow/src/Sync.cpp) (libSceAgc) - non-sample-dump event types (any event other than 0x38 and 0x39) emit a 2-dword PM4 packet 0x46 without address dwords; the address argument is ignored for these events. Void Terrarium (PPSA03061, #5055) passes a non-null address buffer (0x00000002d2a10000) with event type 0x16 (cache flush).
- This pending declaration has an unverified signature and behavior; it is a parameterless import-resolution declaration that throws through `NotImplemented_nid_no_patch`: [`sceAgcAcbInitializeDefaultHardwareState`](../../../core/libs/prx/libSceAgc/Unimplemented.cpp).
- [sceAgcAcquireMemSetEngine, sceAgcCbMemsetExclusive](../../../core/libs/prx/libSceAgc/Unimplemented.cpp) (libSceAgc) - declared with canonical signatures from decrypted headers; behavior on retail consoles remains unmeasured. Both throw through `NotImplemented_nid_no_patch`.
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