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unicorn/qemu
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Joseph Myers 85b647e486
target/i386: fix pcmpxstrx substring search 
One of the cases of the SSE4.2 pcmpestri / pcmpestrm / pcmpistri /
pcmpistrm instructions does a substring search. The implementation of
this case in the pcmpxstrx helper is incorrect. The operation in this
case is a search for a string (argument d to the helper) in another
string (argument s to the helper); if a copy of d at a particular
position would run off the end of s, the resulting output bit should
be 0 whether or not the strings match in the region where they
overlap, but the QEMU implementation was wrongly comparing only up to
the point where s ends and counting it as a match if an initial
segment of d matched a terminal segment of s. Here, "run off the end
of s" means that some byte of d would overlap some byte outside of s;
thus, if d has zero length, it is considered to match everywhere,
including after the end of s. This patch fixes the implementation to
correspond with the proper instruction semantics. This fixes four gcc
test failures in my GCC 6-based testing.

Backports commit ae35eea7e4a9f21dd147406dfbcd0c4c6aaf2a60 from qemu
2018-03-04 23:58:45 -05:00
..
accel target/arm: [tcg] Port to generic translation framework 2018-03-04 20:28:06 -05:00
crypto crypto: Clean up includes 2018-02-19 00:47:40 -05:00
default-configs arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
docs docs: clarify memory region lifecycle 2018-02-12 15:11:21 -05:00
fpu softfloat: define floatx80_round() 2018-03-03 20:57:27 -05:00
hw i386: Remove AMD feature flag aliases from Opteron models 2018-03-01 23:49:04 -05:00
include tcg/s390: Use constant pool for movi 2018-03-04 22:32:04 -05:00
qapi qapi: add explicit null to string input and output visitors 2018-03-03 20:32:50 -05:00
qobject qnum: add uint type 2018-03-03 18:37:56 -05:00
qom boards.h: Define new flag ignore_memory_transaction_failures 2018-03-04 21:27:15 -05:00
scripts scripts: use build_ prefix for string not piped through cgen() 2018-03-03 22:11:28 -05:00
target target/i386: fix pcmpxstrx substring search 2018-03-04 23:58:45 -05:00
tcg tcg/mips: Fully convert tcg_target_op_def 2018-03-04 23:54:26 -05:00
util configure: Drop AIX host support 2018-03-04 21:32:40 -05:00
aarch64.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
aarch64eb.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
accel.c clean-up: removed duplicate #includes 2018-02-28 08:51:56 -05:00
arm.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
armeb.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
atomic_template.h tcg: Add atomic128 helpers 2018-02-27 21:43:48 -05:00
CODING_STYLE import 2015-08-21 15:04:50 +08:00
configure configure: Drop AIX host support 2018-03-04 21:32:40 -05:00
COPYING import 2015-08-21 15:04:50 +08:00
COPYING.LIB import 2015-08-21 15:04:50 +08:00
cpu-exec-common.c tcg: Add EXCP_ATOMIC 2018-02-27 11:57:58 -05:00
cpu-exec.c tcg: Move USE_DIRECT_JUMP discriminator to tcg/cpu/tcg-target.h 2018-03-04 21:52:35 -05:00
cpus.c tcg: handle EXCP_ATOMIC exception for system emulation 2018-03-02 09:56:43 -05:00
cputlb.c cputlb: Support generating CPU exceptions on memory transaction failures 2018-03-04 13:14:50 -05:00
exec.c memory: Open code FlatView rendering 2018-03-04 02:06:48 -05:00
gen_all_header.sh arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
glib_compat.c qapi: Improve qobject input visitor error reporting 2018-03-02 12:05:53 -05:00
HACKING import 2015-08-21 15:04:50 +08:00
header_gen.py tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
ioport.c hw: remove pio_addr_t 2018-02-24 02:43:16 -05:00
LICENSE import 2015-08-21 15:04:50 +08:00
m68k.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
Makefile Makefile: Add a FORCE target 2018-02-24 17:03:51 -05:00
Makefile.objs tcg: Add atomic helpers 2018-02-27 15:57:47 -05:00
Makefile.target tcg: Add generic translation framework 2018-03-04 14:31:16 -05:00
memory.c memory: Move FlatView allocation to a helper 2018-03-04 02:08:37 -05:00
memory_ldst.inc.c exec: introduce memory_ldst.inc.c 2018-03-01 09:59:34 -05:00
memory_mapping.c include/qemu/osdep.h: Don't include qapi/error.h 2018-02-21 23:08:18 -05:00
mips.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
mips64.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
mips64el.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
mipsel.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
powerpc.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
qapi-schema.json qapi: Update scripts to commit 01b2ffcedd94ad7b42bc870e4c6936c87ad03429 2018-03-03 18:32:12 -05:00
qemu-timer.c timer/cpus: fix some typos and update some comments 2018-02-25 23:21:57 -05:00
rules.mak rules.mak: Don't extract libs from .mo-libs in link command 2018-02-26 02:08:03 -05:00
softmmu_template.h cputlb: Support generating CPU exceptions on memory transaction failures 2018-03-04 13:14:50 -05:00
sparc.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
sparc64.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00
tcg-runtime.c tcg: Increase hit rate of lookup_tb_ptr 2018-03-03 17:16:23 -05:00
translate-all.c tcg: Infrastructure for managing constant pools 2018-03-04 22:17:33 -05:00
translate-all.h translate-all.c: Compute L1 page table properties at runtime 2018-02-26 11:46:58 -05:00
translate-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
unicorn_common.h qom/cpu: Add MemoryRegion property 2018-02-18 21:54:50 -05:00
VERSION import 2015-08-21 15:04:50 +08:00
vl.c util: add cacheinfo 2018-03-03 16:58:28 -05:00
vl.h import 2015-08-21 15:04:50 +08:00
x86_64.h tcg: Add tcg_op_supported 2018-03-04 23:20:28 -05:00