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LLVM backend for 6502
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Jonathan Roelofs 3d47855394 Fix thumbv4t indirect calls 
So there are a couple of issues with indirect calls on thumbv4t. First, the most
'obvious' instruction, 'blx' isn't available until v5t. And secondly, the
next-most-obvious sequence: 'mov lr, pc; bx rN' doesn't DTRT in thumb code
because the saved off pc has its thumb bit cleared, so when the callee returns
we end up in ARM mode.... yuck.

The solution is to 'bl' to a nearby landing pad with a 'bx rN' in it.

We could cut down on code size by sharing the landing pads between call sites
that are close enough, but for the moment let's do correctness first and look at
performance later.


Patch by: Iain Sandoe

http://reviews.llvm.org/D6519


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223380 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-04 19:34:50 +00:00
autoconf Expose LLVM version string via macro in llvm-config.h, and modify Go bindings 2014-11-19 03:34:17 +00:00
bindings Add bindings for the rest of the MCJIT options that we previously 2014-12-02 21:09:01 +00:00
cmake Detect if the linker is gold and if so always use --gc-sections. 2014-12-04 17:54:35 +00:00
docs Add a section to Statepoint docs mentioning shared bugzilla search and standard mailing lists 2014-12-04 18:33:28 +00:00
examples ExceptionDemo: Let setMCJITMemoryManager() take unique_ptr, since r223183. 2014-12-03 02:05:51 +00:00
include Remove dead code. NFC. 2014-12-04 16:59:36 +00:00
lib Fix thumbv4t indirect calls 2014-12-04 19:34:50 +00:00
projects
test Fix thumbv4t indirect calls 2014-12-04 19:34:50 +00:00
tools Add mach-o LC_RPATH support to llvm-objdump 2014-12-04 07:37:02 +00:00
unittests Remove dead code. NFC. 2014-12-04 16:59:36 +00:00
utils test-release.sh: Add a way to specify --build to configure 2014-12-04 17:15:35 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt [OCaml] [cmake] Add CMake buildsystem for OCaml. 2014-12-01 19:50:23 +00:00
CODE_OWNERS.TXT
configure Expose LLVM version string via macro in llvm-config.h, and modify Go bindings 2014-11-19 03:34:17 +00:00
CREDITS.TXT
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt

README.txt 

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