Project(aosp-riscv) progress log (time in reverse order).

2022-09-30 Status update
- RVI upstream:
  - added riscv64 for tapas & banchan: riscv-android-src/platform-build#7
  - add riscv64 for vndk snapshot build script: riscv-android-src/platform-development#2
- Articles update:
  - Study Notes: Andorid Build System: https://zhuanlan.zhihu.com/p/561492724
  - How to add application for AOSP: https://zhuanlan.zhihu.com/p/562629048
  - Study Notes: Android Init Language: https://zhuanlan.zhihu.com/p/564715676
  - Android Early Init Boot Sequence: https://zhuanlan.zhihu.com/p/565027512
  - Study Notes: VNDK basic concepts: https://zhuanlan.zhihu.com/p/567512089
2022-08-30 Status update
- RVI upstream:
  - skip ptrace testing cases: riscv-android-src/platform-bionic#35
  - Backport commits to support fe_getround and fe_raise_inexact in builtins: riscv-android-src/toolchain-llvm-project#6
- bionic unit test ( on emulator) status update：
  - Round issue for math lib: resolved with riscv-android-src/toolchain-llvm-project#6
  - Signal Stack unwinding issue：https://gitee.com/aosp-riscv/working-group/issues/I5D6NY, rootcaused and found it is due to current LLVM/libunwind has not support signal frame unwinding. Reported to RVI upstream and T-head has worked out a patch, waiting for the new release and verify it.
  - "-nan" sprintf issue: https://gitee.com/aosp-riscv/working-group/issues/I5CKA4: will not priority it now, plan to report to Google and have a look what will they comment on this.
  - sys_ptrace: https://gitee.com/aosp-riscv/working-group/issues/I5NL9M, resolved with riscv-android-src/platform-bionic#35
- Articles update:
  - Participated in the 2nd RISC-V China Summit and made a joint report with RVI Android SIG chairman - Maohan, sildes at: https://github.com/aosp-riscv/working-group/blob/master/docs/slides/202208-rvsc2022-rvi-aosp-report.pdf
  - Signal Frame introduction: https://zhuanlan.zhihu.com/p/555659009
  - Libraries about Stack unwinding: https://zhuanlan.zhihu.com/p/556211455
  - Notes about ptrace: https://zhuanlan.zhihu.com/p/559140687
2022-07-30 Status update
- RVI upstream: The synchronization work between aosp-riscv (https://github.com/aosp-riscv) and RVI upstream (https://github.com/riscv-android-src) is almost complete. We will not add new features to aosp-riscv, and the development work later will move to RVI upstream (https://github.com/riscv-android-src).
  - updated qemu for riscv: riscv-android-src/platform-prebuilts-android-emulator#2
  - updated android 12 guide: riscv-android-src/riscv-android#5
  - Updated the android12.md for cts: riscv-android-src/riscv-android#6
  - rollback commented code: riscv-android-src/platform-bionic#34
  - revert the changes: riscv-android-src/platform-frameworks-av#1
  - remove build options for aosp 10: riscv-android-src/platform-build-soong#6
  - remove.sdk_rv: riscv-android-src/platform-build#4
  - revert.mainline_system_x86: riscv-android-src/platform-build#5
  - remove.sdk_phone_riscv64: riscv-android-src/platform-build#6
  - add -mno-relax when building libc++: riscv-android-src/toolchain-llvm_android#3
- bionic unit test ( on emulator) status update:
  - Round issue for math lib: https://gitee.com/aosp-riscv/working-group/issues/I5BV63, opened LLVM/compiler-rt PR: https://reviews.llvm.org/D128240, rework after review and waiting for reviewer accept.
  - Signal Stack unwinding failure: https://gitee.com/aosp-riscv/working-group/issues/I5D6NY, it is found that the build manifest of llvm-project does not pick the latest bionic and ndk, submitted an issue for discussion: riscv-android-src/toolchain-llvm-project#5
  - "-nan" sprintf error: https://gitee.com/aosp-riscv/working-group/issues/I5CKA4, submitted a GNU toolchain issue: riscv-collab/riscv-gnu-toolchain#1092, waiting for feedback
- Articles:
  - RenderScript poriting analysis for AOSP RISC-V: https://gitee.com/aosp-riscv/working-group/blob/master/articles/20220509-renderscipt-adaptation-analysis-in-android12-riscv64-porting.md (in chinese)
  - Setup CTS env: https://gitee.com/aosp-riscv/working-group/blob/master/articles/20220705-build-the-cts.md
  - Call Stack (RISC-V): https://zhuanlan.zhihu.com/p/542845861
  - Stack Unwinding - Overview: https://zhuanlan.zhihu.com/p/543823849
  - Stack Unwinding with Frame Pointer: https://zhuanlan.zhihu.com/p/543825539
  - Stack Unwinding with CFI: https://zhuanlan.zhihu.com/p/546207071
  - GCC cross toolchain for building RISC-V from source: https://zhuanlan.zhihu.com/p/544827596
2022-06-30 Status update
- RVI upstream:
  - roll-back temp changes: riscv-android-src/platform-bionic#27
  - redefine ucontext: riscv-android-src/platform-bionic#28
  - fixed benchmark for link reloc: riscv-android-src/platform-bionic#29
  - Fix unistd.exec_argv0_null for new kernels.: riscv-android-src/platform-bionic#32
  - use clang integrated as: riscv-android-src/platform-build-soong#4
  - add no-relax: riscv-android-src/platform-build-soong#5
  - updated android 12 download steps: riscv-android-src/riscv-android#4
- aosp-riscv development and bugfix:
  - added build of run-as: https://gitee.com/aosp-riscv/test-riscv/pulls/22
  - update env and add 8.log: https://gitee.com/aosp-riscv/test-riscv/pulls/21
  - added 9.log: https://gitee.com/aosp-riscv/test-riscv/pulls/23
  - Investigate round issue for math lib：
    - Root-Analysis: https://gitee.com/aosp-riscv/working-group/issues/I5BV63
    - Raised LLVM/compiler-rt PR: https://reviews.llvm.org/D128240 ，waiting for review.
  - Signal Stack unwinding failure：
    - Root-Analysis: https://gitee.com/aosp-riscv/working-group/issues/I5D6NY, in investigating
  - "-nan" sprintf error
    - Root-Analysis: https://gitee.com/aosp-riscv/working-group/issues/I5CKA4
    - submit a GNU toolchain issue: riscv-collab/riscv-gnu-toolchain#1092, waiting for feedback
  - ifunc crash
    - Root-Analysis: https://gitee.com/aosp-riscv/working-group/issues/I5DNIJ, found rootcasue, in resloving
  - exec_argv0_null failed
    - Root-Analysis: https://gitee.com/aosp-riscv/working-group/issues/I5EGDI, resolved.
- Articles:
  - Bazel for AOSP: https://zhuanlan.zhihu.com/p/529147848 (in chinese)
  - GNU IFUNC (RISC-V): https://zhuanlan.zhihu.com/p/532312568 (in chinese)
  - IFUNC in BIONIC: https://zhuanlan.zhihu.com/p/532885045 (in chinese)
2022-05-30 Status update
- RVI upstream:
  - redo prebuilt ndk for 12: riscv-android-src/platform-prebuilts-ndk#2
  - fixed some typo issues: riscv-android-src/platform-bionic#20
  - fixed issue for setjmp: riscv-android-src/platform-bionic#21
  - using 0x0001(c.addi) as padding bytes: riscv-android-src/platform-bionic#23
  - remove TLS_SLOT_SELF for riscv: riscv-android-src/platform-bionic#24
  - passed setjmp_DeathTest.setjmp_cookie_checksum: riscv-android-src/platform-bionic#25
  - fixed TLS issues and pass unit tests: riscv-android-src/platform-bionic#26
- aosp-riscv development and bugfix:
  - PR for Disable dex2oat: https://gitee.com/aosp-riscv/platform_build/pulls/5
  - completed sync mem* from RVI upstream：https://gitee.com/aosp-riscv/platform_bionic/pulls/22
  - fix setjmp issue： https://gitee.com/aosp-riscv/platform_bionic/pulls/21
  - sync from rvi upstream：https://gitee.com/aosp-riscv/platform_bionic/pulls/19
  - added log after fixed setjmp issue：https://gitee.com/aosp-riscv/test-riscv/pulls/18
  - enable those disabled cases: https://gitee.com/aosp-riscv/test-riscv/pulls/19
  - workaround sanitize issue: https://gitee.com/aosp-riscv/platform_build_soong/pulls/7
  - sync tls from rvi: https://gitee.com/aosp-riscv/platform_bionic/pulls/24
  - fixed setjmp checksum issue: https://gitee.com/aosp-riscv/platform_bionic/pulls/23
- Articles:
  - PR for the analysis of RenderScript in Android 12 RISCV64 porting: https://gitee.com/aosp-riscv/working-group/pulls/34
  - add article about setjmp：https://gitee.com/aosp-riscv/working-group/pulls/35
2022-04-28 Status update
- RVI upstream:
- aosp-riscv development and bugfix:
  - Updated emulator integration branch
  - Remove bcc and ld.mc in Target Base System
- Technical articles related:
2022-03-30 Status update
- Sync aosp-riscv to RVI upstream:
  - improve vfork
- Sync aosp-riscv from RVI upstream:
  - N/A
- aosp-riscv development and bugfix:
- Technical articles related:
  - added doc to introduce howto build emu
  - Add rust toolchain build instructions
2022-03-16 Status update
- Sync aosp-riscv to RVI upstream:
  - squash and remove duplicated codes
  - minor bugfixes in fenv
- Sync aosp-riscv from RVI upstream:
  - riscv64: fix fenv handling
- aosp-riscv development and bugfix:
- Technical articles related:
2022-03-03 Status update
- Sync aosp-riscv to RVI upstream:
- Sync aosp-riscv from RVI upstream:
- aosp-riscv development and bugfix:
- Technical articles related:
  - status updated on Feb/17/2022
  - added template for articles
2022-02-17 Status update
- Setup bionic dynamic-link unit test and bugfix:
- Sync aosp-riscv from RVI upstream:
- Sync aosp-riscv to RVI upstream:
2022-01-20 Status update
- Bionic static unit test and bugfix:
- Article/Document update:
- RVI aosp 12 upstream work:
2021-12-23 Status update
- Build a minimal system, run AOSP's bionic-unit-test-static on QEMU, and solve the bugs found in the test.
  - malloc.malloc_info: SIGABRT：https://gitee.com/aosp-riscv/test-riscv/pulls/2
  - part of stdio cases FAILED due to can not create tmpfiles: https://gitee.com/aosp-riscv/test-riscv/pulls/2
  - Fixed wrong mdev path issue: https://gitee.com/aosp-riscv/test-riscv/pulls/2
  - ifunc.*：Segmentation fault: https://gitee.com/aosp-riscv/platform_bionic/pulls/4; also raise PR to upstream: riscv-android-src/platform-bionic#1
  - added bionic-unit-tests-static log: https://gitee.com/aosp-riscv/test-riscv/pulls/2
  - Added doc on how-to setup test env: https://gitee.com/aosp-riscv/test-riscv/pulls/2
- Participate in OSDTConf2021 and present a report about AOSP for RISC-V community open source progress
  - report slides: https://github.com/plctlab/PLCT-Open-Reports/blob/master/20211218-osdt2021-aosp-rv-wangchen.pdf
  - report vedio: https://www.bilibili.com/video/BV1Sg411w7Le
2021-12-10: Bionic has been successfully compiled, and integration tests are being run using the gtest suite provided by Google.
- Clang toolchain: added libFuzzer
- Enable soong tests during building:
  - aosp-riscv/platform_build_soong#1
  - aosp-riscv/platform-build-bazel#1
- Move some patches to git:
- Pass build with "mmm bionic":
- Added test repo:
  - https://gitee.com/aosp-riscv/platform_manifest/pulls/11
2021-11-30 For AOSP 12 ported to RV64, the implementation of mmm bionic/libc/ --skip-soong-tests was successfully built, we now have libc/libm/libdl. The relevant changes have been submitted to the repositories. The details are as follows (here, some PRs are created on gitee, all commits are pushed both on github & gitee):
- toolchain for AOSP：
  - Rust for Android:
    - compiler: add riscv64gc-linux-android target (Tier 3): https://github.com/aosp-riscv/rust/commit/8397a76b895b586dcfc8637e98908f65df1af1f9
    - library: add riscv64gc-linux-android support: https://github.com/aosp-riscv/rust/commit/2eacf985415ba38018de70845c0b150885ad4d57
    - Modified libc, added support for riscv64：aosp-riscv/toolchain_rustc#1
  - Clang/llvm for Android:
    - add riscv __get_tls method: https://github.com/aosp-riscv/toolchain_llvm-project/commit/2511f435f0c0c02f1a64d55b3b45c657dc84b050
    - Change some repos' fetch address and revision to support riscv64: https://github.com/aosp-riscv/platform_manifest/commit/a3446a1580947ac5d5d29e99365fdf90b0edb3ef
- manifest：PR: https://gitee.com/aosp-riscv/platform_manifest/pulls/7
- AOSP (PRs)：
2021-11-15 For AOSP 12 ported to RV64, the implementation of m --skip-ninja --skip-soong-tests was successfully built. The relevant changes have been submitted to the repositories. The details are as follows (here, gitee is taken as an example, github has been mirrored):
- manifest repository：https://gitee.com/aosp-riscv/platform_manifest
- Newly added AOSP repositories:
  - art/ : https://gitee.com/aosp-riscv/platform_art
  - bionic/: https://gitee.com/aosp-riscv/platform_bionic
  - build/make/: https://gitee.com/aosp-riscv/platform_build
  - build/soong/: https://gitee.com/aosp-riscv/platform_build_soong
  - external/crosvm/: https://gitee.com/aosp-riscv/platform_external_crosvm
  - frameworks/av/: https://gitee.com/aosp-riscv/platform_frameworks_av
  - packages/modules/NeuralNetworks/: https://gitee.com/aosp-riscv/platform-packages-modules-NeuralNetworks
  - prebuilts/vndk/v28/: https://gitee.com/aosp-riscv/platform-prebuilts-vndk-v28
  - prebuilts/vndk/v29/: https://gitee.com/aosp-riscv/platform-prebuilts-vndk-v29
  - prebuilts/vndk/v30/: https://gitee.com/aosp-riscv/platform-prebuilts-vndk-v30
  - system/apex/: https://gitee.com/aosp-riscv/platform-system-apex
  - system/core/: https://gitee.com/aosp-riscv/platform_system_core
  - system/iorap/: https://gitee.com/aosp-riscv/platform-system-iorap
  - system/nvram/: https://gitee.com/aosp-riscv/platform-system-nvram
- In addition, some repositories are currently unable to be created on gitee/github because the overall volume or some files are too large and exceed the limitaiton required by gitee/github. Therefore, we currently use patching method to save the changes, and below are these repositories involved:
  - cts/
  - frameworks/base/
  - packages/modules/ArtPrebuilt/
  - packages/services/Car/
  - prebuilts/clang/host/linux-x86/
  - prebuilts/runtime/ The newly built patch repository is: https://gitee.com/aosp-riscv/patches_aosp_riscv
- The list of PRs submitted is as follows:
- Updated tech article “Howto build aosp-riscv”
- Newed tech article "Code analysis for soong_ui"
2021-10-29 Restart the AOSP migration work of PLCT lab. The new goal is to migrate AOSP 12 to RV64.
- Setup group @ https://github.com/aosp-riscv (mirrored with https://gitee.com/aosp-riscv) with some initial repos.
- [PR Merged] added note on howto setup build env: https://gitee.com/aosp-riscv/working-group/pulls/1
- Newed tech article "Code analysis for envsetup"
- Newed tech article "Howto setup build environment"
2021-01-xx Due to open-source work from T-Head(alibaba), we (PLCT lab) stopped the AOSP porting work in early 2021. All code repositories (except working-group) under the original https://github.com/aosp-riscv and https://gitee.com/aosp-riscv are backed up to Gitee's aosp-riscv-bionic-porting.
2021-01-15 Still in investigating how to add RVG64 support based on the Soong framework of AOSP. The main difficulty at present is: due to the AOSP compilation system is extremely large and complex, contains too much content required for engineering, and is intertwined and dependent on each other, so how to cleanly mask the modules that we don’t care about first and only compile those core content of the bionic library is the current focus and difficulty. There is not much clue yet, anyone is welcomed to provide help and suggestions.
2020-12-29 Completed the porting of dynamic linking feature for bionic, we can now support implicit dynamic link and explicit dynamic link with bionic. The make framework system is also improved. For specific changes, please refer to the develop branch of the bionic transplantation main repository, https://github.com/aosp-riscv/port_bionic. The next step is to port and modify AOSP's Soong construction system and use AOSP Soong construction system to compile the bionic library and related applications for RISC-V.
2020-12-15
- Started to port the dynamic link functionality for bionic. Currently, the compilation and linking of libc.so and linker have been completed, but still can not work well. We are still under debugging. Anybody familiar with the dynamic linker are welcomed to provide your suggestions. For specific changes, please refer to the develop branch of the bionic transplantation main repository, https://github.com/aosp-riscv/port_bionic, and its corresponding submodule repository.
- The focus of further work is still to achieve dynamic link support, and the current implementation flaws are felt to be larger than static links. In addition, we will continue to improve the bionic function and try to transplant the Soong construction system of AOSP, and support the use of AOSP Soong construction system to compile the bionic library and related applications for RISC-V.
2020-11-30 Completed the porting of shell and init. Currently, the bionic libc.a library can work, and a minimal Android root file system can be generated by statically linking against it. The rootfs can be launched and run on qemu-system-riscv64 and supports running some basic operation commands. In addition, the original make framework system has been improved to prepare for the next stage to further support dynamic linking. For specific changes, please refer to the develop branch of the bionic transplantation main repository, https://github.com/aosp-riscv/port_bionic, and its corresponding submodule repository. For more detailed introduction, please refer to another introduction article: ["Create a minimal Android system for RISC-V"] (https://plctlab.github.io/aosp/create-a-minimal-android-system-for-riscv.html). The next step is to improve the dynamic linking support, continue to improve the bionic function and try to transplant the Soong construction system of AOSP, and support the use of the Soong construction system of AOSP to compile the bionic library and related applications for RISC-V.
2020-11-13 Further improve the libc static library of bionic. Currently using v10.0.1 llvm/clang to compile, and using the GNU RISC-V version of ld based on bionic's libc_static, crtbegin_static and crtend.o to achieve static linking and executable program generation. On this basis, we transplanted and compiled the toybox that comes with AOSP and made a minimal rootfs (shell and init still use busybox compiled for glibc). At present, the rootfs can be started and run on qemu-system-riscv64. You can run some commands, but some commands will report errors when executed. For specific changes, please refer to the commit comment of the develop branch of the bionic porting main repository, https://github.com/aosp-riscv/port_bionic, and the commit comments of the develop branch of its submodule repositories. The next step will be to continue to improve the libc of bionic and the self-made minimal root file system.
2020-10-30 The make framework has been improved to support the compilation and generation of libc static libraries, as well as crtbegin.o and crtend.o. Currently, the statically compiled executable program can jump from the kernel to the main function and ensure that argv and envp are read correctly. The porting of other TLS and syscall parts is still ongoing. For specific changes, please refer to the develop branch of https://github.com/aosp-riscv/port_bionic.
2020-10-16 Simplify the build framework of the AOSP bionic library to make, and submit the preliminary porting work to the develop branch of https://github.com/aosp-riscv/port_bionic. Currently, the project repository depends on two sub-repositories: https://github.com/aosp-riscv/platform_bionic and https://github.com/aosp-riscv/external_jemalloc_new (Because the changes are still drafts, the current changes to AOSP are all placed on their respective develop branches. Another note: the current porting work is based off android-10.0.0_r39 tag version based on AOSP). The next step is to continue to improve the make project and make changes to the bionic code. The first goal is to implement libc.a.
2020-10-01 Using the latest AOSP kernel and configuration, with GNU and LLVM/Clang tool-chain for RISC-V, we successfully compiled and booted the kernel on QEMU. The only problem is: after mounting the minimum rootfs, we encounter a "Segmentation Fault" error. Still debugging this issue. In addition, we began to study how to port the bionic library of AOSP to RISC-V. The current work is to port the AOSP building framework for bionic.
2020-09-15 We launched the task to port the AOSP kernel to RISC-V. After some research, we decided to base it off the branch android-5.4-stable of AOSP common kernels and we are working on it now.
2020-09-01 We fixed the errors in build dir and prebuilts dir when using the 'mmm art/compiler' to generate the ninja files for the compiler module. We are debugging the errors in the system dir and cts dir.
2020-08-15 We have added the lunch menu for RISC-V, and successfully loaded the menu. After that, we added the RISC-V config files for build/make and build/soong, We are debugging the RISC-V config files in build/soong.

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