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e7a7d8c508
This brings down the size of the struct from 56 to 32 bytes on 64-bit,
and to 20 bytes on 32-bit. This leads to memory savings:
Before:
$ find . -name 'tcg.o' | xargs size
text data bss dec hex filename
41131 29800 88 71019 1156b ./aarch64-softmmu/tcg/tcg.o
37969 29416 96 67481 10799 ./x86_64-linux-user/tcg/tcg.o
39354 28816 96 68266 10aaa ./arm-linux-user/tcg/tcg.o
40802 29096 88 69986 11162 ./arm-softmmu/tcg/tcg.o
39417 29672 88 69177 10e39 ./x86_64-softmmu/tcg/tcg.o
After:
$ find . -name 'tcg.o' | xargs size
text data bss dec hex filename
40883 29800 88 70771 11473 ./aarch64-softmmu/tcg/tcg.o
37473 29416 96 66985 105a9 ./x86_64-linux-user/tcg/tcg.o
38858 28816 96 67770 108ba ./arm-linux-user/tcg/tcg.o
40554 29096 88 69738 1106a ./arm-softmmu/tcg/tcg.o
39169 29672 88 68929 10d41 ./x86_64-softmmu/tcg/tcg.o
Note that using an entire byte for some enums that need less than
that wastes a few bits (noticeable in 32 bits, where we use
20 bytes instead of 16) but avoids extraction code, which overall
is a win--I've tested several variations of the patch, and the appended
is the best performer for OpenSSL's bntest by a very small margin:
Before:
$ taskset -c 0 perf stat -r 15 -- x86_64-linux-user/qemu-x86_64 img/bntest-x86_64 >/dev/null
[...]
Performance counter stats for 'x86_64-linux-user/qemu-x86_64 img/bntest-x86_64' (15 runs):
10538.479833 task-clock (msec) # 0.999 CPUs utilized ( +- 0.38% )
772 context-switches # 0.073 K/sec ( +- 2.03% )
0 cpu-migrations # 0.000 K/sec ( +-100.00% )
2,207 page-faults # 0.209 K/sec ( +- 0.08% )
10.552871687 seconds time elapsed ( +- 0.39% )
After:
$ taskset -c 0 perf stat -r 15 -- x86_64-linux-user/qemu-x86_64 img/bntest-x86_64 >/dev/null
Performance counter stats for 'x86_64-linux-user/qemu-x86_64 img/bntest-x86_64' (15 runs):
10459.968847 task-clock (msec) # 0.999 CPUs utilized ( +- 0.30% )
739 context-switches # 0.071 K/sec ( +- 1.71% )
0 cpu-migrations # 0.000 K/sec ( +- 68.14% )
2,204 page-faults # 0.211 K/sec ( +- 0.10% )
10.473900411 seconds time elapsed ( +- 0.30% )
Backports commit 00c8fa9ffeee7458e5ed62c962faf638156c18da from qemu
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| bindings | ||
| docs | ||
| include | ||
| msvc | ||
| qemu | ||
| samples | ||
| tests | ||
| .appveyor.yml | ||
| .gitignore | ||
| .travis.yml | ||
| AUTHORS.TXT | ||
| Brewfile | ||
| ChangeLog | ||
| config.mk | ||
| COPYING | ||
| COPYING.LGPL2 | ||
| COPYING_GLIB | ||
| CREDITS.TXT | ||
| install-cmocka-linux.sh | ||
| list.c | ||
| make.sh | ||
| Makefile | ||
| msvc.bat | ||
| pkgconfig.mk | ||
| README.md | ||
| uc.c | ||
| windows_export.bat | ||
Unicorn Engine
Unicorn is a lightweight, multi-platform, multi-architecture CPU emulator framework based on QEMU.
Unicorn offers some unparalleled features:
- Multi-architecture: ARM, ARM64 (ARMv8), M68K, MIPS, SPARC, and X86 (16, 32, 64-bit)
- Clean/simple/lightweight/intuitive architecture-neutral API
- Implemented in pure C language, with bindings for Crystal, Clojure, Visual Basic, Perl, Rust, Ruby, Python, Java, .NET, Go, Delphi/Free Pascal and Haskell.
- Native support for Windows & *nix (with Mac OSX, Linux, *BSD & Solaris confirmed)
- High performance via Just-In-Time compilation
- Support for fine-grained instrumentation at various levels
- Thread-safety by design
- Distributed under free software license GPLv2
Further information is available at http://www.unicorn-engine.org
License
This project is released under the GPL license.
Compilation & Docs
See docs/COMPILE.md file for how to compile and install Unicorn.
More documentation is available in docs/README.md.
Contact
Contact us via mailing list, email or twitter for any questions.
Contribute
If you want to contribute, please pick up something from our Github issues.
We also maintain a list of more challenged problems in a TODO list.
CREDITS.TXT records important contributors of our project.