[Bug sanitizer/59018] New: [4.9 Regression] libsanitizer doesn't build for x32

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59018

            Bug ID: 59018
           Summary: [4.9 Regression] libsanitizer doesn't build for x32
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org

r204368 breaks x32.  There are 4 problems:

1. internal_syscall casts pointers to uint64.  It doesn't work for
x32 since 32-bit pointers are signed extended to int64. They should
be casted to uptr first.  A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00403.html

2. internal_clone needs to allocate 2 int64 to restore 2 pointers
by pop which only pops 64-bit integer into 64-bit register. Also
"movq   %6,%%r8\n" can't be used to load 32-bit pointer into 64-bit
r8.  We should let compiler handle it.  A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00405.html

3. x32 uses the same file system calls as x86-64. The types
used in those system calls must be the same for x32 and x86-64.
A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00407.html

4. X32 uses the same FPU state as x86-64.  We should check
__x86_64 instead of __WORDSIZE == 64.  A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00408.html

All patches are tested on x32, x86-64 and x86.