[RISC-V] Add support for AddressSanitizer on RISC-V GCC

[Joshua via Gcc-patches]

From: cooper.joshua <cooper.jos...@linux.alibaba.com>

    gcc/
    
        * config/riscv/riscv.c (asan_shadow_offset): Implement the offset of 
asan shadow memory for risc-v.
        (asan_shadow_offset): new macro definition.

    libsanitizer/
    
        * sanitizer_common/sanitizer_common.h (ModuleArch): New enumerator.
        (ModuleArchToString): New architecture option.
        * sanitizer_common/sanitizer_platform.h: New macro definition.
        * sanitizer_common/sanitizer_symbolizer_libcdep.cpp (GetArgV): New 
architecture option.
---
 gcc/config/riscv/riscv.c                                      | 11 +++++++++++
 libsanitizer/sanitizer_common/sanitizer_common.h              |  5 ++++-
 libsanitizer/sanitizer_common/sanitizer_platform.h            |  6 ++++++
 .../sanitizer_common/sanitizer_symbolizer_libcdep.cpp         |  2 ++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/gcc/config/riscv/riscv.c b/gcc/config/riscv/riscv.c
index bfb3885..05669c2 100644
--- a/gcc/config/riscv/riscv.c
+++ b/gcc/config/riscv/riscv.c
@@ -5245,6 +5245,14 @@ riscv_gpr_save_operation_p (rtx op)linux.alibaba
   return true;
 }
 
+/* Implement TARGET_ASAN_SHADOW_OFFSET.  */
+
+static unsigned HOST_WIDE_INT
+riscv_asan_shadow_offset (void)
+{
+  return HOST_WIDE_INT_UC (0x10000000);
+}
+
 /* Initialize the GCC target structure.  */
 #undef TARGET_ASM_ALIGNED_HI_OP
 #define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
@@ -5428,6 +5436,9 @@ riscv_gpr_save_operation_p (rtx op)
 #undef TARGET_NEW_ADDRESS_PROFITABLE_P
 #define TARGET_NEW_ADDRESS_PROFITABLE_P riscv_new_address_profitable_p
 
+#undef TARGET_ASAN_SHADOW_OFFSET
+#define TARGET_ASAN_SHADOW_OFFSET riscv_asan_shadow_offset
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-riscv.h"
diff --git a/libsanitizer/sanitizer_common/sanitizer_common.h 
b/libsanitizer/sanitizer_common/sanitizer_common.h
index ac16e0e..ea7dff7 100644
--- a/libsanitizer/sanitizer_common/sanitizer_common.h
+++ b/libsanitizer/sanitizer_common/sanitizer_common.h
@@ -649,7 +649,8 @@ enum ModuleArch {
   kModuleArchARMV7,
   kModuleArchARMV7S,
   kModuleArchARMV7K,
-  kModuleArchARM64
+  kModuleArchARM64,
+  kModuleArchRISCV
 };
 
 // Opens the file 'file_name" and reads up to 'max_len' bytes.
@@ -693,6 +694,8 @@ inline const char *ModuleArchToString(ModuleArch arch) {
       return "armv7k";
     case kModuleArchARM64:
       return "arm64";
+    case kModuleArchRISCV:
+      return "riscv";
   }
   CHECK(0 && "Invalid module arch");
   return "";
diff --git a/libsanitizer/sanitizer_common/sanitizer_platform.h 
b/libsanitizer/sanitizer_common/sanitizer_platform.h
index c68bfa2..bf52490 100644
--- a/libsanitizer/sanitizer_common/sanitizer_platform.h
+++ b/libsanitizer/sanitizer_common/sanitizer_platform.h
@@ -126,6 +126,12 @@
 # define FIRST_32_SECOND_64(a, b) (a)
 #endif
 
+#if defined(__riscv__)
+# define SANITIZER_RISCV 1
+#else
+# define SANITIZER_RISCV 0
+#endif
+
 #if defined(__x86_64__) && !defined(_LP64)
 # define SANITIZER_X32 1
 #else
diff --git a/libsanitizer/sanitizer_common/sanitizer_symbolizer_libcdep.cpp 
b/libsanitizer/sanitizer_common/sanitizer_symbolizer_libcdep.cpp
index 490c6fe..408f57d 100644
--- a/libsanitizer/sanitizer_common/sanitizer_symbolizer_libcdep.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_symbolizer_libcdep.cpp
@@ -270,6 +270,8 @@ class LLVMSymbolizerProcess : public SymbolizerProcess {
     const char* const kSymbolizerArch = "--default-arch=s390x";
 #elif defined(__s390__)
     const char* const kSymbolizerArch = "--default-arch=s390";
+#elif defined(__riscv__)
+    const char* const kSymbolizerArch = "--default-arch=riscv";
 #else
     const char* const kSymbolizerArch = "--default-arch=unknown";
 #endif
-- 
2.7.4