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Vedant Kumar 89ece8e139 [llvm-mc] Ignore opcode size prefix in 64-bit CALL disassembly 
This is a fix for disassembling unusual instruction sequences in 64-bit
mode w.r.t the CALL rel16 instruction. It might be desirable to move the
check somewhere else, but it essentially mimics the special case
handling with JCXZ in 16-bit mode.

The current behavior accepts the opcode size prefix and causes the
call's immediate to stop disassembling after 2 bytes. When debugging
sequences of instructions with this pattern, the disassembler output
becomes extremely unreliable and essentially useless (if you jump midway
into what lldb thinks is a unified instruction, you'll lose %rip). So we
ignore the prefix and consume all 4 bytes when disassembling a 64-bit
mode binary.

Note: in Vol. 2A 3-99 the Intel spec states that CALL rel16 is N.S. N.S.
is defined as:

    Indicates an instruction syntax that requires an address override
    prefix in 64-bit mode and is not supported. Using an address
    override prefix in 64-bit mode may result in model-specific
    execution behavior. (Vol. 2A 3-7)

Since 0x66 is an operand override prefix we should be OK (although we
may want to warn about 0x67 prefixes to 0xe8). On the CPUs I tested
with, they all ignore the 0x66 prefix in 64-bit mode.

Patch by Matthew Barney!

Differential Revision: http://reviews.llvm.org/D9573

llvm-svn: 246038
2015-08-26 16:20:29 +00:00
autoconf Add an exposed variable for which c++ compiler we're using for our 2015-08-17 22:46:26 +00:00
bindings [PM/AA] Remove the last relics of the separate IPA library from LLVM, 2015-08-18 17:51:53 +00:00
cmake [cmake] Pass /manifest:no to the linker when asan is enabled 2015-08-25 16:06:40 +00:00
docs Big Kaleidoscope tutorial update. 2015-08-26 03:07:41 +00:00
examples Kaleidoscope: Update libdeps corresponding to r246002. 2015-08-26 08:05:55 +00:00
include [SROA] Rip out all support for SSAUpdater in SROA. 2015-08-26 09:09:29 +00:00
lib [llvm-mc] Ignore opcode size prefix in 64-bit CALL disassembly 2015-08-26 16:20:29 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
test [llvm-mc] Ignore opcode size prefix in 64-bit CALL disassembly 2015-08-26 16:20:29 +00:00
tools [llvm-objdump] Use the new MinVersion API introduced in r245938. NFC. 2015-08-26 12:26:11 +00:00
unittests AsmParser: Save and restore the parsing state for types using SlotMapping. 2015-08-21 21:32:39 +00:00
utils [lit] Speculatively fix PR24554 by manually closing the process handle 2015-08-25 16:07:06 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Minor updates to gitignore so that symlinks are ignored in the projects dir. 2015-07-07 20:24:58 +00:00
CMakeLists.txt [lit] Don't disable the lit progress bar by default with MSVC 2015-08-11 21:24:59 +00:00
CODE_OWNERS.TXT Add myself as the InstCombine owner. 2015-08-12 22:30:45 +00:00
configure Add an exposed variable for which c++ compiler we're using for our 2015-08-17 22:46:26 +00:00
CREDITS.TXT [WebAssembly] Initial WebAssembly backend 2015-06-29 23:51:55 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
Makefile.rules We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

README.txt 

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