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Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, X86)
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Python 3.9%
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Laurent Vivier 68c9ab9b77
target/m68k: fix V flag for CC_OP_SUBx 
V flag for subtraction is:

v = (res ^ src1) & (src1 ^ src2)

(see COMPUTE_CCR() in target/m68k/helper.c)

But gen_flush_flags() uses:

v = (res ^ src2) & (src1 ^ src2)

The problem has been found with the following program:

.global _start
_start:
move.l #-2147483648,%d0
subq.l #1,%d0
jvc 1f
move.l #1,%d1
move.l #1,%d0
trap #0
1:
move.l #0,%d1
move.l #1,%d0
trap #0

It works fine (exit(1)) on real hardware, and with "-singlestep".

"-singlestep" uses gen_helper_flush_flags(), whereas
without "-singlestep", V flag is computed directly in
gen_flush_flags().

This patch updates gen_flush_flags() to have the same result
as with gen_helper_flush_flags().

Backports commit 043b936ef6fe53396b3c6b8f5562ea3e238a071d from qemu
2018-03-03 14:59:20 -05:00
bindings
docs
include tcg: remove global exit_request 2018-03-02 09:38:08 -05:00
msvc tcg: move TCG_MO/BAR types into own file 2018-03-02 09:08:44 -05:00
qemu target/m68k: fix V flag for CC_OP_SUBx 2018-03-03 14:59:20 -05:00
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 Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
windows_export.bat

README.md

Unicorn Engine

Join the chat at https://gitter.im/unicorn-engine/chat

Build Status Build status

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.