[scudo] ARM32 support

[cryptoad]

Summary

With the previous modifications, the code works on ARM32. The random shuffle
test is unsupported on 32-bit platforms for the moment and being marked as
such. There is no hardware support for the checksum computation yet, this will
come at a later point.

[rengolin]

Hi Kostya,

What's the point of adding a review if you're going to commit anyway?

http://llvm.org/docs/DeveloperPolicy.html#code-reviews

"once a patch is sent out for review, it needs an explicit “looks good” before it is submitted. Do not assume silent approval, or request active objections to the patch with a deadline."

cheers,
--renato

[cryptoad]

My apologies, I assumed it was benign enough. It won't happen again.

cmake/config-ix.cmake

 set(ALL_PROFILE_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${PPC64}
     ${MIPS32} ${MIPS64} ${S390X})
 set(ALL_TSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64} ${PPC64})
 set(ALL_UBSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X})
 set(ALL_SAFESTACK_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64} ${MIPS32} ${MIPS64})
 set(ALL_CFI_SUPPORTED_ARCH ${X86} ${X86_64} ${MIPS64})
 set(ALL_ESAN_SUPPORTED_ARCH ${X86_64} ${MIPS64})
-set(ALL_SCUDO_SUPPORTED_ARCH ${X86} ${X86_64})
+set(ALL_SCUDO_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32})
 set(ALL_XRAY_SUPPORTED_ARCH ${X86_64} ${ARM32} ${ARM64})
 
 if(APPLE)
   include(CompilerRTDarwinUtils)
 
   find_darwin_sdk_dir(DARWIN_osx_SYSROOT macosx)
   find_darwin_sdk_dir(DARWIN_iossim_SYSROOT iphonesimulator)
   find_darwin_sdk_dir(DARWIN_ios_SYSROOT iphoneos)

test/scudo/random_shuffle.cpp

 // RUN: %clang_scudo %s -o %t
 // RUN: rm -rf %T/random_shuffle_tmp_dir
 // RUN: mkdir %T/random_shuffle_tmp_dir
 // RUN: %run %t 100 > %T/random_shuffle_tmp_dir/out1
 // RUN: %run %t 100 > %T/random_shuffle_tmp_dir/out2
 // RUN: %run %t 10000 > %T/random_shuffle_tmp_dir/out1
 // RUN: %run %t 10000 > %T/random_shuffle_tmp_dir/out2
 // RUN: not diff %T/random_shuffle_tmp_dir/out?
 // RUN: rm -rf %T/random_shuffle_tmp_dir
-// UNSUPPORTED: i386-linux,i686-linux
+// UNSUPPORTED: i386-linux,i686-linux,arm-linux,armhf-linux
 
 // Tests that the allocator shuffles the chunks before returning to the user.
 
 #include <stdlib.h>
 #include <stdio.h>
 
 int main(int argc, char **argv) {
   int alloc_size = argc == 2 ? atoi(argv[1]) : 100;
   char *base = new char[alloc_size];
   for (int i = 0; i < 20; i++) {
     char *p = new char[alloc_size];
     printf("%zd\n", base - p);
   }
 }