Initial commit

Initial commit

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build XCFramework
+    runs-on: macos-15
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Show toolchain
+        run: xcodebuild -version
+
+      - name: Install XcodeGen
+        run: brew install xcodegen
+
+      - name: Generate Xcode project
+        run: xcodegen generate
+
+      - name: Build framework
+        run: |
+          xcodebuild archive \
+            -project StikJIT.xcodeproj \
+            -scheme StikJIT \
+            -destination 'generic/platform=iOS' \
+            -archivePath build/StikJIT-iOS \
+            SKIP_INSTALL=NO \
+            BUILD_LIBRARY_FOR_DISTRIBUTION=YES \
+            CODE_SIGNING_ALLOWED=NO
+
+      - name: Assemble XCFramework
+        run: |
+          xcodebuild -create-xcframework \
+            -framework build/StikJIT-iOS.xcarchive/Products/Library/Frameworks/StikJIT.framework \
+            -output StikJIT.xcframework
+
+      - name: Upload XCFramework
+        uses: actions/upload-artifact@v4
+        with:
+          name: StikJIT.xcframework
+          path: StikJIT.xcframework
+          if-no-files-found: error

.gitignore

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+# Build output
+build/
+DerivedData/
+
+# The framework is a build artifact — rebuild it with the steps in README.md.
+StikJIT.xcframework/
+
+# XcodeGen-generated project — run `xcodegen generate`.
+*.xcodeproj
+
+# Xcode user data
+xcuserdata/
+*.xcuserstate
+
+# OS / editor junk
+.DS_Store
+*.bak
+*.swp
+*.log

LICENSE

@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

README.md

@@ -0,0 +1,36 @@
+# StikJIT
+
+An iOS XCFramework that enables JIT for another process over the device's RSD tunnel. Based on StikDebug.
+
+A separate process (e.g. an app extension) attaches a debugserver to the target by PID, marks its JIT memory executable, then detaches. It is self-contained: the idevice FFI and `universal.js` are bundled inside. The target must carry the `get-task-allow` entitlement.
+
+## Use
+
+Add `StikJIT.xcframework` to your target (Embed & Sign), then call it off the main thread:
+
+```swift
+import StikJIT
+
+try StikJIT.enableJIT(
+    targetPID: hostPID,             // process to enable JIT for
+    pairingFile: pairingFileURL,    // device pairing file
+    progress: { print("[StikJIT] \($0)") }
+)
+```
+
+It blocks until done and throws `StikJITError` on failure. Pass `configuration:` to override the tunnel endpoint (defaults to `10.7.0.1:49152`).
+
+## Build
+
+```sh
+xcodegen generate
+xcodebuild archive -scheme StikJIT -destination 'generic/platform=iOS' \
+  -archivePath build/StikJIT BUILD_LIBRARY_FOR_DISTRIBUTION=YES
+xcodebuild -create-xcframework \
+  -framework build/StikJIT.xcarchive/Products/Library/Frameworks/StikJIT.framework \
+  -output StikJIT.xcframework
+```
+
+## License
+
+StikJIT is licensed under the MPL-2.0 (see [`LICENSE`](LICENSE)). It uses StikDebug as a reference, with the bundled [idevice](https://github.com/jkcoxson/idevice) and universal.js retaining their own licenses.

Resources/universal.js

@@ -0,0 +1,296 @@
+// Universal JIT Script, last updated 2026-29-03 (YYYY-DD-MM)
+/*
+ // JIT "syscalls"
+ __attribute__((noinline,optnone,naked))
+ void JIT26Detach(void) {
+     asm("mov x16, #0 \n"
+         "brk #0xf00d \n"
+         "ret");
+ }
+ __attribute__((noinline,optnone,naked))
+ void* JIT26PrepareRegion(void *addr, size_t len) {
+     asm("mov x16, #1 \n"
+         "brk #0xf00d \n"
+         "ret");
+ }
+
+ __attribute__((noinline,optnone,naked))
+void BreakSendJITScript(char* script, size_t len) {
+    asm("mov x16, #2 \n"
+        "brk #0xf00d \n"
+        "ret");
+}
+ */
+const CMD_DETACH = 0;
+const CMD_PREPARE_REGION = 1;
+const CMD_NEW_BREAKPOINTS = 2;
+const commands = {
+    [CMD_DETACH]: JIT26Detach,
+    [CMD_PREPARE_REGION]: JIT26PrepareRegion,
+    [CMD_NEW_BREAKPOINTS]: JIT26NewBreakpoints
+};
+const legacyCommands = {
+    [0x68]: JIT26NewBreakpoints,
+    [0x69]: JIT26HandleBrk0x69,
+    [0xf00d]: JIT26HandleBrk0xf00d
+};
+
+// Log levels
+//const LOG_NONE = 0;
+const LOG_INFO = 1;
+const LOG_VERBOSE = 2;
+let logLevel = LOG_INFO;
+function log_verbose(msg) {
+    if (logLevel >= LOG_VERBOSE) {
+        log(msg);
+    }
+}
+
+// To avoid having to re-parse these in each function, we save some registers here
+let tid, x0, x1, x16, pc;
+let detached = false;
+let continuesWithSignal = true;
+let pid = get_pid();
+let attachResponse = send_command(`vAttach;${pid.toString(16)}`);
+
+log(`pid = ${pid}`);
+log(`attach_response = ${attachResponse}`);
+    
+let totalBreakpoints = 0;
+while (!detached) {
+    totalBreakpoints++;
+    log(`Handling signal ${totalBreakpoints}`);
+    
+    let brkResponse = send_command(`c`);
+    log_verbose(`brkResponse = ${brkResponse}`);
+    
+    // extract tid, pc, x16
+    let tmpMatch = /T[0-9a-f]+thread:(?<tid>[0-9a-f]+);/.exec(brkResponse);
+    tid = tmpMatch ? tmpMatch.groups['tid'] : null;
+    tmpMatch = /20:(?<reg>[0-9a-f]{16});/.exec(brkResponse);
+    pc = tmpMatch ? tmpMatch.groups['reg'] : null;
+    tmpMatch = /10:(?<reg>[0-9a-f]{16});/.exec(brkResponse);
+    x16 = tmpMatch ? tmpMatch.groups['reg'] : null;
+    if (!tid || !pc || !x16) {
+        log(`Failed to extract registers: tid=${tid}, pc=${pc}, x16=${x16}`);
+        continue;
+    }
+    pc = littleEndianHexStringToNumber(pc);
+    x16 = littleEndianHexStringToNumber(x16);
+    
+    let instructionResponse = send_command(`m${pc.toString(16)},4`);
+    log(`instruction at pc: ${instructionResponse}`);
+    let instrU32 = littleEndianHexToU32(instructionResponse);
+    
+    // check if this is a brk
+    if ((instrU32 & 0xFFE0001F)>>>0 != 0xD4200000) {
+        log(`Skipping: instruction was not a brk (was 0x${instrU32.toString(16)})`);
+        if (continuesWithSignal) {
+            let signum = /^T(?<sig>[a-z0-9;]{2})/.exec(brkResponse);
+            signum = signum ? signum.groups['sig'] : null;
+            if (!signum) {
+                log(`Failed to extract signal number: ${signum}`);
+                continue;
+            }
+            log(`Continuing with signal 0x${signum}`);
+            send_command(`vCont;S${signum}:${tid}`);
+        }
+        continue;
+    }
+    
+    let brkImmediate = extractBrkImmediate(instrU32);
+    log(`BRK immediate: 0x${brkImmediate.toString(16)} (${brkImmediate})`);
+    if (legacyCommands[brkImmediate] != undefined) {
+        // when we find a valid brk immediate command, parse x0 and x1
+        tmpMatch = /00:(?<reg>[0-9a-f]{16});/.exec(brkResponse);
+        x0 = tmpMatch ? tmpMatch.groups['reg'] : null;
+        tmpMatch = /01:(?<reg>[0-9a-f]{16});/.exec(brkResponse);
+        x1 = tmpMatch ? tmpMatch.groups['reg'] : null;
+        if (!x0 || !x1) {
+            log(`Failed to extract registers: x0=${x0}, x1=${x1}`);
+            continue;
+        }
+        x0 = littleEndianHexStringToNumber(x0);
+        x1 = littleEndianHexStringToNumber(x1);
+        
+        // jump over brk
+        let pcPlus4 = numberToLittleEndianHexString(pc + 4n);
+        let pcPlus4Response = send_command(`P20=${pcPlus4};thread:${tid};`);
+        log(`pcPlus4Response = ${pcPlus4Response}`);
+        
+        // dispatch brk-immediate command
+        const command = legacyCommands[brkImmediate];
+        command(brkResponse);
+    } else {
+        log(`Skipping breakpoint: brk immediate 0x${brkImmediate.toString(16)} was not handled by this script. You could add it by evaluating legacyCommands[0x${brkImmediate.toString(16)}] = yourFunction;`);
+        continue;
+    }
+}
+
+function JIT26Detach() {
+    let detachResponse = send_command(`D`);
+    log_verbose(`detachResponse = ${detachResponse}`);
+    detached = true;
+}
+
+// brk 0x68
+function JIT26NewBreakpoints(brkResponse) {
+    let instructionResponse = send_command(`m${pc.toString(16)},4`);
+    log(`instruction at pc: ${instructionResponse}`);
+    let instrU32 = littleEndianHexToU32(instructionResponse);
+    let brkImmediate = extractBrkImmediate(instrU32);
+    
+    let memResponse = send_command(`m${x0.toString(16)},${x1}`);
+
+    let scriptText = hexToAscii(memResponse);
+    log_verbose(`Script text: ${scriptText}`);
+
+    const res = runScriptAndCapture(scriptText);
+    if (res.ok) {
+        log('Script succeeded:', res.value);
+    } else {
+        log('Script failed:', res.name, res.message);
+        log(res.stack);
+    }
+}
+
+// brk 0x69
+function JIT26HandleBrk0x69(brkResponse) {
+    // in the old script we chose 0x69, so now we check here and return error
+    // if you wish to keep using this, you can set your own handler like `legacyCommands[0x69] = yourHandler;` using BreakSendJITScript
+    log(`Error: It seems you are using legacy breakpoint 0x69. Please set your legacy handler using \`legacyCommands[0x69] = yourHandler;\` or migrate to universal jitcalls to use this script. The function will now return 0xE0000069.`);
+    let putX0Response = send_command(`P0=E0000069;thread:${tid};`);
+    log(`putX0Response = ${putX0Response}`);
+}
+
+// brk 0xf00d
+function JIT26HandleBrk0xf00d(brkResponse) {
+    // dispatch command via x16
+    const command = commands[x16];
+    if (command === undefined) {
+        log(`Unknown command ${x16.toString(16)}`);
+        return;
+    }
+    log(`Invoking command ${x16.toString(16)}`);
+    command(brkResponse);
+}
+
+function JIT26PrepareRegion(brkResponse) {
+    let instructionResponse = send_command(`m${pc.toString(16)},4`);
+    log(`instruction at pc: ${instructionResponse}`);
+    let instrU32 = littleEndianHexToU32(instructionResponse);
+    let brkImmediate = extractBrkImmediate(instrU32);
+    
+    if (x0 == 0n && x1 == 0n) {
+        return;
+    }
+
+    let jitPageAddress = x0;
+    if (x0 == 0n) {
+        let requestRXResponse = send_command(`_M${x1.toString(16)},rx`);
+        log_verbose(`requestRXResponse = ${requestRXResponse}`);
+        
+        if (!requestRXResponse || requestRXResponse.length === 0) {
+            log(`Failed to allocate RX memory`);
+            return;
+        }
+        
+        jitPageAddress = BigInt(`0x${requestRXResponse}`);
+        log(`Allocated JIT page at address: 0x${jitPageAddress.toString(16)}`);
+    }
+
+    let prepareJITPageResponse = prepare_memory_region(jitPageAddress, x1);
+    log(`prepareJITPageResponse = ${prepareJITPageResponse}`);
+
+    let putX0Response = send_command(`P0=${numberToLittleEndianHexString(jitPageAddress)};thread:${tid};`);
+    log(`putX0Response = ${putX0Response}`);
+}
+
+// utilities
+function littleEndianHexStringToNumber(hexStr) {
+    const bytes = [];
+    for (let i = 0; i < hexStr.length; i += 2) {
+        bytes.push(parseInt(hexStr.substr(i, 2), 16));
+    }
+    let num = 0n;
+    for (let i = 4; i >= 0; i--) {
+        num = (num << 8n) | BigInt(bytes[i]);
+    }
+    return num;
+}
+
+function numberToLittleEndianHexString(num) {
+    const bytes = [];
+    for (let i = 0; i < 5; i++) {
+        bytes.push(Number(num & 0xFFn));
+        num >>= 8n;
+    }
+    while (bytes.length < 8) {
+        bytes.push(0);
+    }
+    return bytes.map(b => b.toString(16).padStart(2, '0')).join('');
+}
+
+function littleEndianHexToU32(hexStr) {
+    return parseInt(hexStr.match(/../g).reverse().join(''), 16);
+}
+
+function extractBrkImmediate(u32) {
+    return (u32 >> 5) & 0xFFFF;
+}
+
+function hexToAscii(hexStr) {
+    let str = '';
+    for (let i = 0; i < hexStr.length; i += 2) {
+        const byte = parseInt(hexStr.substr(i, 2), 16);
+        if (byte === 0) break;
+        str += String.fromCharCode(byte);
+    }
+    return str;
+}
+
+function runScriptAndCapture(scriptText) {
+    try {
+        const value = eval(scriptText);
+        return { ok: true, value };
+    } catch (err) {
+        return {
+            ok: false,
+            name: err && err.name,
+            message: err && err.message,
+            stack: err && err.stack
+        };
+    }
+}
+
+// For making your own script / adding your own breakpoints. you can send this string to BreakSendJITScript and it'll add it for any subsequent breakpoints
+// x0, x1, x16, pc and tid are global variables. If you need more registers, parse them like:
+// tmpMatch = /02:(?<reg>[0-9a-f]{16});/.exec(brkResponse); // x2
+// let x2 = tmpMatch ? tmpMatch.groups['reg'] : null;
+// if (!x2) {
+//     log(`Failed to extract registers: x2=${x2}`);
+//     return;
+// }
+// x2 = littleEndianHexStringToNumber(x2);
+//
+/*
+commands[3] = wowBreakPoint;
+
+function wowBreakPoint(brekpoint) {
+    let instructionResponse = send_command(`m${pc.toString(16)},4`);
+    log(`instruction at pc: ${instructionResponse}`);
+    let instrU32 = littleEndianHexToU32(instructionResponse);
+    let brkImmediate = extractBrkImmediate(instrU32);
+    
+    if (x0 == 0n && x1 == 0n) {
+        return;
+    }
+
+    let jitPageAddress = x0;
+    let prepareJITPageResponse = prepare_memory_region(jitPageAddress, x1);
+    log(`prepareJITPageResponse = ${prepareJITPageResponse}`);
+
+    let putX0Response = send_command(`P0=${numberToLittleEndianHexString(jitPageAddress)};thread:${tid};`);
+    log(`putX0Response = ${putX0Response}`);
+}
+*/

Sources/BundledScript.swift

@@ -0,0 +1,16 @@
+import Foundation
+
+enum BundledScript {
+
+    static func universalJS() throws -> String {
+        let bundle = Bundle(for: BundleToken.self)
+        guard let url = bundle.url(forResource: "universal", withExtension: "js"),
+              let source = try? String(contentsOf: url, encoding: .utf8),
+              !source.isEmpty else {
+            throw StikJITError.scriptUnavailable
+        }
+        return source
+    }
+}
+
+private final class BundleToken {}

Sources/IdeviceFFI.swift

@@ -0,0 +1,21 @@
+import Foundation
+@_implementationOnly import idevice
+
+enum IdeviceFFI {
+
+    static func consume(_ pointer: UnsafeMutablePointer<IdeviceFfiError>?,
+                        fallback: String) -> StikJITError {
+        guard let pointer else { return .device(code: -1, subCode: 0, message: fallback) }
+        let error = StikJITError.device(
+            code: pointer.pointee.code,
+            subCode: pointer.pointee.sub_code,
+            message: pointer.pointee.message.map { String(cString: $0) } ?? fallback)
+        idevice_error_free(pointer)
+        return error
+    }
+
+    static func check(_ fallback: String,
+                      _ call: () -> UnsafeMutablePointer<IdeviceFfiError>?) throws {
+        if let error = call() { throw consume(error, fallback: fallback) }
+    }
+}

Sources/JITSession.swift

@@ -0,0 +1,108 @@
+import Foundation
+@_implementationOnly import idevice
+
+final class JITSession {
+
+    struct Tunnel {
+        var adapter: OpaquePointer?
+        var handshake: OpaquePointer?
+        func free() {
+            if let handshake { rsd_handshake_free(handshake) }
+            if let adapter { adapter_free(adapter) }
+        }
+    }
+
+    private struct DebugSession {
+        var remoteServer: OpaquePointer?
+        var debugProxy: OpaquePointer?
+        func free() {
+            if let debugProxy { debug_proxy_free(debugProxy) }
+            if let remoteServer { remote_server_free(remoteServer) }
+        }
+    }
+
+    private let pairingFilePath: String
+    private let configuration: StikJIT.Configuration
+
+    init(pairingFilePath: String, configuration: StikJIT.Configuration) {
+        self.pairingFilePath = pairingFilePath
+        self.configuration = configuration
+    }
+
+    func enableJIT(targetPID: Int32, progress: @escaping (String) -> Void) throws {
+        let tunnel = try makeTunnel()
+        defer { tunnel.free() }
+
+        let session = try connectDebugSession(over: tunnel)
+        defer { session.free() }
+
+        guard let debugProxy = session.debugProxy else { throw StikJITError.debugProxyUnavailable }
+
+        debug_proxy_send_ack(debugProxy)
+        _ = try? sendCommand("QStartNoAckMode", over: debugProxy)
+        debug_proxy_set_ack_mode(debugProxy, 0)
+
+        try ScriptRunner(targetPID: targetPID, debugProxy: debugProxy, progress: progress).run()
+    }
+
+    private func openPairingFile() throws -> OpaquePointer {
+        guard !pairingFilePath.isEmpty, FileManager.default.fileExists(atPath: pairingFilePath) else {
+            throw StikJITError.pairingFile("not found at \(pairingFilePath)")
+        }
+        var handle: OpaquePointer?
+        try IdeviceFFI.check("failed to read pairing file") {
+            pairingFilePath.withCString { rp_pairing_file_read($0, &handle) }
+        }
+        guard let handle else { throw StikJITError.pairingFile("unreadable at \(pairingFilePath)") }
+        return handle
+    }
+
+    private func makeTunnel() throws -> Tunnel {
+        let pairing = try openPairingFile()
+        defer { rp_pairing_file_free(pairing) }
+
+        var address = sockaddr_in()
+        address.sin_family = sa_family_t(AF_INET)
+        address.sin_port = configuration.rsdPort.bigEndian
+        _ = configuration.deviceAddress.withCString { inet_pton(AF_INET, $0, &address.sin_addr) }
+
+        var tunnel = Tunnel()
+        try IdeviceFFI.check("failed to create RSD tunnel") {
+            "StikJIT".withCString { hostname in
+                withUnsafePointer(to: &address) { pointer in
+                    pointer.withMemoryRebound(to: sockaddr.self, capacity: 1) { sa in
+                        tunnel_create_rppairing(
+                            sa, socklen_t(MemoryLayout<sockaddr_in>.stride),
+                            hostname, pairing, nil, nil,
+                            &tunnel.adapter, &tunnel.handshake)
+                    }
+                }
+            }
+        }
+        return tunnel
+    }
+
+    private func connectDebugSession(over tunnel: Tunnel) throws -> DebugSession {
+        var session = DebugSession()
+        try IdeviceFFI.check("failed to connect remote server") {
+            remote_server_connect_rsd(tunnel.adapter, tunnel.handshake, &session.remoteServer)
+        }
+        try IdeviceFFI.check("failed to connect debug proxy") {
+            debug_proxy_connect_rsd(tunnel.adapter, tunnel.handshake, &session.debugProxy)
+        }
+        return session
+    }
+
+    @discardableResult
+    private func sendCommand(_ command: String, over debugProxy: OpaquePointer) throws -> String? {
+        guard let handle = command.withCString({ debugserver_command_new($0, nil, 0) }) else { return nil }
+        defer { debugserver_command_free(handle) }
+        var response: UnsafeMutablePointer<CChar>?
+        try IdeviceFFI.check("debugserver command failed") {
+            debug_proxy_send_command(debugProxy, handle, &response)
+        }
+        guard let response else { return nil }
+        defer { idevice_string_free(response) }
+        return String(cString: response)
+    }
+}

Sources/ScriptRunner.swift

@@ -0,0 +1,81 @@
+import Foundation
+import JavaScriptCore
+@_implementationOnly import idevice
+
+final class ScriptRunner {
+
+    private static let jitPageSize: UInt64 = 16384
+
+    private let targetPID: Int32
+    private let debugProxy: OpaquePointer
+    private let progress: (String) -> Void
+    private var context: JSContext?
+
+    init(targetPID: Int32, debugProxy: OpaquePointer, progress: @escaping (String) -> Void) {
+        self.targetPID = targetPID
+        self.debugProxy = debugProxy
+        self.progress = progress
+    }
+
+    func run() throws {
+        let source = try BundledScript.universalJS()
+
+        guard let context = JSContext() else { throw StikJITError.scriptUnavailable }
+        self.context = context
+
+        context.exceptionHandler = { [weak self] _, value in
+            self?.progress("JS exception: \(value?.toString() ?? "<unknown>")")
+        }
+
+        let getPID: @convention(block) () -> Int = { [targetPID] in Int(targetPID) }
+        let send: @convention(block) (String?) -> String = { [weak self] command in
+            guard let self, let command else { return "" }
+            return self.sendCommand(command) ?? ""
+        }
+        let prepare: @convention(block) (Double, Double) -> String = { [weak self] address, length in
+            guard let self else { return "" }
+            return self.prepareMemoryRegion(UInt64(address), length: UInt64(length)) ?? "OK"
+        }
+        let log: @convention(block) (JSValue?) -> Void = { [weak self] value in
+            self?.progress(value?.toString() ?? "")
+        }
+
+        context.setObject(getPID,  forKeyedSubscript: "get_pid" as NSString)
+        context.setObject(send,    forKeyedSubscript: "send_command" as NSString)
+        context.setObject(prepare, forKeyedSubscript: "prepare_memory_region" as NSString)
+        context.setObject(log,     forKeyedSubscript: "log" as NSString)
+
+        progress("Running universal.js against pid \(targetPID)…")
+        context.evaluateScript(source)
+        progress("JIT script finished (region blessed, detached).")
+    }
+
+    private func sendCommand(_ command: String) -> String? {
+        guard let handle = command.withCString({ debugserver_command_new($0, nil, 0) }) else { return nil }
+        defer { debugserver_command_free(handle) }
+        var response: UnsafeMutablePointer<CChar>?
+        if let error = debug_proxy_send_command(debugProxy, handle, &response) {
+            progress("send_command error: \(IdeviceFFI.consume(error, fallback: "send_command").localizedDescription)")
+            return nil
+        }
+        guard let response else { return "" }
+        defer { idevice_string_free(response) }
+        return String(cString: response)
+    }
+
+    private func prepareMemoryRegion(_ address: UInt64, length: UInt64) -> String? {
+        guard length > 0 else { return "OK" }
+        let pageCount = (length - 1) / Self.jitPageSize + 1
+        for page in 0..<pageCount {
+            let pageAddress = address + page * Self.jitPageSize
+
+            let response = sendCommand("M\(String(pageAddress, radix: 16)),1:69")
+            if let response, !(response.hasPrefix("OK") || response.isEmpty) {
+                progress("page bless failed @0x\(String(pageAddress, radix: 16)): \(response)")
+                return nil
+            }
+        }
+        progress("Blessed \(pageCount) JIT page(s) at 0x\(String(address, radix: 16))")
+        return "OK"
+    }
+}

Sources/StikJIT.swift

@@ -0,0 +1,26 @@
+import Foundation
+
+public enum StikJIT {
+
+    public struct Configuration: Sendable {
+
+        public var deviceAddress: String
+
+        public var rsdPort: UInt16
+
+        public init(deviceAddress: String = "10.7.0.1", rsdPort: UInt16 = 49152) {
+            self.deviceAddress = deviceAddress
+            self.rsdPort = rsdPort
+        }
+
+        public static let `default` = Configuration()
+    }
+
+    public static func enableJIT(targetPID: Int32,
+                                 pairingFile: URL,
+                                 configuration: Configuration = .default,
+                                 progress: @escaping (String) -> Void = { _ in }) throws {
+        let session = JITSession(pairingFilePath: pairingFile.path, configuration: configuration)
+        try session.enableJIT(targetPID: targetPID, progress: progress)
+    }
+}

Sources/StikJITError.swift

@@ -0,0 +1,25 @@
+import Foundation
+
+public enum StikJITError: Error, LocalizedError {
+
+    case pairingFile(String)
+
+    case scriptUnavailable
+
+    case debugProxyUnavailable
+
+    case device(code: Int32, subCode: Int32, message: String)
+
+    public var errorDescription: String? {
+        switch self {
+        case .pairingFile(let detail):
+            return "Pairing file error: \(detail)."
+        case .scriptUnavailable:
+            return "The bundled universal.js could not be loaded from the StikJIT framework."
+        case .debugProxyUnavailable:
+            return "Failed to establish a debugserver connection to the target process."
+        case .device(let code, let subCode, let message):
+            return "\(message) (idevice code \(code)/\(subCode))."
+        }
+    }
+}

idevice/module.modulemap

@@ -0,0 +1,4 @@
+module idevice [system] {
+  header "idevice.h"
+  export *
+}

project.yml

@@ -0,0 +1,49 @@
+name: StikJIT
+options:
+  bundleIdPrefix: com.stik
+  deploymentTarget:
+    iOS: "17.4"
+  createIntermediateGroups: true
+
+settings:
+  base:
+    SWIFT_VERSION: "5.0"
+    MARKETING_VERSION: "1.0.0"
+    CURRENT_PROJECT_VERSION: "1"
+    CLANG_CXX_LIBRARY: "libc++"
+
+targets:
+  StikJIT:
+    type: framework
+    platform: iOS
+    sources:
+      - path: Sources
+      - path: Resources
+        buildPhase: resources
+    dependencies:
+      - sdk: JavaScriptCore.framework
+      - sdk: Network.framework
+      - sdk: Security.framework
+      - sdk: CFNetwork.framework
+      - sdk: SystemConfiguration.framework
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: com.stik.StikJIT
+        PRODUCT_NAME: StikJIT
+        DEFINES_MODULE: YES
+        BUILD_LIBRARY_FOR_DISTRIBUTION: YES
+        SKIP_INSTALL: NO
+        # idevice FFI: modulemap/headers to compile `import idevice`, and force_load the
+        # static lib so all its symbols are embedded in the framework binary (self-contained).
+        SWIFT_INCLUDE_PATHS: "$(SRCROOT)/idevice"
+        HEADER_SEARCH_PATHS: "$(SRCROOT)/idevice"
+        LIBRARY_SEARCH_PATHS: "$(SRCROOT)/idevice"
+        OTHER_LDFLAGS: "-force_load $(SRCROOT)/idevice/libidevice_ffi.a"
+
+schemes:
+  StikJIT:
+    build:
+      targets:
+        StikJIT: all
+    archive:
+      config: Release