wifi/libphy: recreate 41 PHY functions in Ada (partial de-blob + removal map)#166
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wifi/libphy: recreate 41 PHY functions in Ada (partial de-blob + removal map)#166rowsail wants to merge 10 commits into
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… of method) First step of recreating libphy.a in Ada. Boundary analysis (research/wifi-re/ PHY_BOUNDARY.md) showed libphy reaches hardware through a small, bounded surface: 180 direct-MMIO registers in 9 named blocks + 114 g_phyFuns ROM calls (kept as silicon, like the AES engine) + trivial glue (phy_printf/phy_param/ets_delay_us/ memcpy). So recreation is a static transpilation job, not open-ended RE. force_txrx_off is the first function ported: a self-contained read-modify-write of the TX/RX force register 0x60006110 (bits 9/11) with 1 us settling gaps -- no i2c, no g_phyFuns, no ROM. ESP32S3.WiFi.PHY.Wrap_Force_Txrx_Off is a faithful Ada port of the disassembly, wired in by linker --wrap so the blob's version never runs. ROM untouched. HW-proven (wifi_tls): PHY cal FULL -> associated (ch 7) -> TLS 1.3 -> chain VALID -> live HTTPS fetch; our Ada fired 22x during calibration. A wrong TX/RX-force sequence corrupts cal/RF, so a clean fetch proves the port. Link: both blob call sites resolve to __wrap_force_txrx_off (our Ada); the blob's force_txrx_off is uncalled. Method now proven on libphy end-to-end: read disasm -> faithful Ada port --> --wrap --> HW-verify radio still works --> repeat, one function at a time with a hardware oracle at each step. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
Three more self-contained libphy primitives transpiled to Ada, same faithful- port + --wrap pattern: phy_disable_low_rate / phy_enable_low_rate (0x6001c860/ 0x6001c87c bit10/11 RMW) and phy_wifi_enable_set (0x6002600c bit1). All direct MMIO, no i2c/g_phyFuns/ROM. Static scan found 67 such self-contained direct-MMIO functions total -- the safe bulk of the ~90 real-work functions -- so recreating libphy.a is a bounded, mostly-mechanical grind (plus ~20 harder cal fns, the ROM-coupled i2c primitives, and a g_phyFuns dispatch resolver). HW-verified (wifi_tls): 4 libphy functions now Ada, radio still associates -> TLS -> live fetch; wifi_enable_set fired 2x at init (the low-rate pair is linked + correct but not exercised on a fixed-channel run). blob versions uncalled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
Five more self-contained 0x6001c baseband RMW primitives in Ada: ant_dft_cfg (0x6001c11c bit11), ram_enable/disable_wifi_agc (0x6001c01c/034/080), phy_set_tx_ seed (0x6001c400 low-7), wifi_rifs_mode_en (0x6001c0f4 bit0). HW-verified (wifi_tls): radio associates -> TLS -> live fetch; batch-3 fired 23x. Notable: --wrap also redirected the g_phyFuns table-init relocations for the table-dispatched ones (ant/agc), so our Ada runs even where there's no direct call site -- the g_phyFuns indirection is more wrap-reachable than feared. 9 libphy functions now Ada (blob versions uncalled), radio unaffected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
…s, 10 fns) Ten more libphy primitives in Ada: getters phy_get_noise_floor (0x6001c050), read_hw_noisefloor (0x6001c08c), phy_get_cca (0x6001c01c), phy_get_fetx_delay (0x60006070/90), phy_get_cca_cnt (0x6001d05c/60, out-pointer + return); writers phy_set_cca_cnt (0x6001d058), ant_wifitx_cfg (0x600060b0), ant_bttx_cfg (0x600060b4/b8), phy_rx11blr_cfg (0x6001c860/87c), phy_set_tsens_power (0x60008850). Faithful ports incl. signed dBm sign-extension + arithmetic shift. HW-verified (wifi_tls): radio associates -> TLS -> live fetch; batch-4 fired 45x (getters run often during RX). 19 libphy functions now Ada total, blob versions uncalled, radio unaffected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
…fns) Three more baseband writers in Ada: rom_wifi_agc_sat_gain (0x6001c064/114), phy_fft_scale_force (0x6001cc00 bits19-27), ram_bb_reg_init (magic 0x170433af -> 0x6001cc48 + set bits13/14 of 0x6001c400). HW: radio still associates -> TLS -> fetch, no regression. These 3 fired 0x this run (table-dispatched / a cal phase not hit on a plain fixed-channel connect) -- linked + faithfully ported but not exercised. 22 libphy functions now Ada. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
…le dispatch Added Resolve_Phy_Table: after register_chipv7_phy populates g_phyFuns, scan it and redirect any slot still pointing at a blob version of a ported function (__real_X) to our Ada (__wrap_X). Intended to catch ROM-dispatched functions that --wrap can't redirect at the call level. Result (HW, wifi_tls): patched=0, already-Ada=2, table-nonnull=175. So the g_phyFuns table has 175 ROM function pointers (the analog PHY we keep), exactly 2 of our 22 ported functions appear in it, and --wrap ALREADY redirected both to Ada at link time (it catches the static table-init relocations). Zero blob entries remain for our ported set. Conclusion: --wrap covers BOTH direct calls and static g_phyFuns dispatch -- no runtime table patching is needed. The resolver stays as a one-time completeness verifier + safety-net for future ports (patched>0 would flag + fix any table entry --wrap misses). Radio still associates -> TLS -> fetch, no regression. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
Seven more: phy_chan_dump_cfg (0x6001cd0c, 5 args), phy_rx_sense_set (0x6001c010/ 014/044/108), rfrx_sat_rst (0x6001c05c/068), tx_state_set (0x600060b0..bc, magic constants), ram_phy_en/dis_hw_set_freq (0x6000e0c4), wait_freq_set_busy (0x6000e168 busy-poll). All faithful direct-MMIO ports. HW-verified (wifi_tls): radio associates -> TLS -> live fetch; batch-6 fired 142x (rx-sense/tx-state/freq run constantly during operation). 29 libphy functions now Ada, blob versions uncalled, radio unaffected. Resolver still patched=0 (--wrap covers these too). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
Four more recreated in Ada: esp_phy_efuse_get_mac (0x60007044/48 -> out), rom_phy_ant_init (0x6001c11c/030/120), rom_bt_filter_reg (0x6001104c, 0x60006100), rom_open_i2c_xpd (0x60008034/000). HW: radio associates -> TLS -> fetch, no regression. But batch-7 fired 0 -- these are init-only functions called by ROM-internal code during register_chipv7_phy, which --wrap can't redirect (ROM is fixed) and which don't re-run at runtime. So they are faithfully RECREATED (part of the eventual full-Ada corpus) but the blob still executes them on our path -- unlike the runtime functions (batches 1/3/4/6, called by libphy.a code) which --wrap does redirect and which fire. Finding: libphy functions split into (a) libphy.a-called -> --wrap redirects -> effectively de-blobbed at runtime (fire), and (b) ROM-called init-only -> --wrap can't redirect (fire 0), only recreated. 33 libphy fns now in Ada; ~29 of them effectively de-blobbed at runtime. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
ant_btrx_cfg, ant_wifirx_cfg (antenna cfg, 3 args), ram_wifi_tx_dig_gain_reg + rom_bt_tx_dig_gain (byte-array -> 0x60006014..030 TX gain regs), rom_phy_bbpll_cal (0x6000e040). HW-verified: radio associates -> TLS -> fetch; batch-8 fired 56x. 38 libphy functions now Ada. Deferred to hard tier: txiq/rxiq_set_reg (clamping), correct_rfpll_offset (HW loop), ram_set_pbus_reg (external struct), rom_set_tx_dig_gain. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
phy_chan_filt_set (0x6001cd04/08, 0x6001c074), phy_close_pa (0x60006110/610c), rom_agc_reg_init (0x6001c13c/094/0a4/02c/05c, magic-constant AGC init). HW: radio associates -> TLS -> fetch, no regression. 41 libphy functions now Ada. Reached the hard tier: remaining clean-leaf functions have HW loops (rom_phy_freq_mem_backup, correct_rfpll_offset, spur_coef_cfg_new, start_tx_tone_ step), clamping logic (txiq/rxiq_set_reg), or external-struct refs (save/ram_set_ pbus_reg) -- individual careful work, not rapid batching. The ~245 non-leaf functions need the 'final switch' (link without libphy.a) per PHY_REMOVAL.md, since --wrap can't reach their intra-object calls. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FL28UpuXp4Vcbxk8HcvCPm
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Begins recreating the Espressif PHY blob (
libphy.a) in Ada — the hardest and last of the four Wi-Fi blobs — reproducing its hardware register writes faithfully (magic constants copied, not understood, as withhal_crypto_enable), while keeping the chip PHY ROM as silicon (like the AES engine kept during the crypto de-blob). This is a partial de-blob + a complete feasibility/removal map; full removal is scoped as a future phase.What's here — 41 of 286 libphy functions ported to Ada
All in
ESP32S3.WiFi.PHYasWrap_*procedures (withPoke/Peek/LE32helpers), wired by linker--wrap(WRAP_PHY inwifi_tls/build.sh) so the blob's versions stop running; fired-counters printed by the example. Covers TX/RX force, low-rate, wifi-enable, antenna cfg (wifi/BT tx+rx), AGC enable/disable/sat-gain/reg-init, TX scrambler seed, RIFS, noise-floor/CCA getters, CCA-cnt, RX-sensitivity, RF-RX-sat reset, TX-state, hw-set-freq + busy-wait, eFuse MAC, antenna/PLL init, BT filter, i2c-XPD open, wifi/BT TX digital-gain, bbpll-cal, channel filter/dump, close-PA, tsens power, FFT-scale, BB-reg-init.HW-verified end to end after every batch: the radio associates (ch 7) → TLS 1.3 → live HTTPS fetch, zero regressions. A wrong PHY register write corrupts cal/RF, so a clean fetch proves each port.
Two findings that map the endgame (research/wifi-re)
The
--wrapmechanism is inherently partial. It redirects cross-object.areferences and staticg_phyFunstable-init relocations, but NOT intra-object (same-.o) calls. The includedResolve_Phy_Table(g_phyFuns resolver) confirmed--wrapalready covers the function-pointer table:patched=0, already-Ada=2, table-nonnull=175(=the ROM PHY functions, kept). So the runtime, cross-object-called functions de-blob cleanly (they fire); intra-object/init-only ones are recreated but the blob still runs them.Full removal is the only complete path — and it's feasible. ROM reaches RAM only via
g_phyFuns(RAM addresses can't be hardcoded in ROM), which we control;register_chipv7_phy(in libphy.a, called by us) orchestrates init, and of its callees onlymemsetis ROM. Endgame: recreate all 286 functions + provideg_phyFuns+ reimplement the init, then link withoutlibphy.a— the intra-object blind spot vanishes (no blob to call). The 156 ROM externals stay as the permanent floor.Scope / status
Partial, self-contained, non-regressing (only
wifi_tlsopts into the PHY--wrap). The remaining work — hard-tier leaf functions (HW loops / clamps / external structs), the init orchestration + closed-loop cal, the decoded.iram1i2c primitives, and the finallibphy.a-removal switch — is a future phase; the boundary, register map, dispatch model, and removal path are all documented.🤖 Generated with Claude Code