On Tue, Aug 25, 2020 at 12:39 PM Jim Wilson <[email protected]> wrote:
> On Wed, Aug 19, 2020 at 1:02 AM Joshua via Gcc-patches
> <[email protected]> wrote:
> > * config/riscv/riscv.c (asan_shadow_offset): Implement the offset
> > of asan shadow memory for risc-v.
> > (asan_shadow_offset): new macro definition.
>
> When I try the patch, I get asan errors complaining about memory mappings.
I tried looking at this again today. I spent a few hours debugging
sanitizer code to see what is going on, and managed to convince myself
that the patch can't possibly work for riscv64-linux. There are at
least two changes missing. It also can't possibly work for
riscv32-linux. There is at least one change missing.
libsanitizer/configure.tgt only supports riscv64-linux, so nothing
gets built for riscv32-linux. I have no idea how you got this
working. Maybe you forgot to send the entire patch? If there is a
way to get it working, it would be good if you could describe in
detail how you got it working.
For riscv64-linux with these additional patches
hifiveu017:1192$ more tmp.file
diff --git a/libsanitizer/asan/asan_mapping.h b/libsanitizer/asan/asan_mapping.h
index 09be904270c..906fb1eebc8 100644
--- a/libsanitizer/asan/asan_mapping.h
+++ b/libsanitizer/asan/asan_mapping.h
@@ -164,6 +164,7 @@ static const u64 kAArch64_ShadowOffset64 = 1ULL << 36;
static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000;
static const u64 kMIPS64_ShadowOffset64 = 1ULL << 37;
static const u64 kPPC64_ShadowOffset64 = 1ULL << 41;
+static const u64 kRISCV64_ShadowOffset64 = 1ULL << 36;
static const u64 kSystemZ_ShadowOffset64 = 1ULL << 52;
static const u64 kSPARC64_ShadowOffset64 = 1ULL << 43; // 0x80000000000
static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30; // 0x40000000
@@ -210,6 +211,8 @@ static const u64 kMyriadCacheBitMask32 = 0x40000000ULL;
# define SHADOW_OFFSET kAArch64_ShadowOffset64
# elif defined(__powerpc64__)
# define SHADOW_OFFSET kPPC64_ShadowOffset64
+# elif defined(__riscv) && (__riscv_xlen == 64)
+# define SHADOW_OFFSET kRISCV64_ShadowOffset64
# elif defined(__s390x__)
# define SHADOW_OFFSET kSystemZ_ShadowOffset64
# elif SANITIZER_FREEBSD
diff --git a/libsanitizer/sanitizer_common/sanitizer_linux.cpp b/libsanitizer/sa
nitizer_common/sanitizer_linux.cpp
index 11c03e286dc..962df07772e 100644
--- a/libsanitizer/sanitizer_common/sanitizer_linux.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_linux.cpp
@@ -1048,6 +1048,8 @@ uptr GetMaxVirtualAddress() {
return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
# elif defined(__mips64)
return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
+# elif defined(__riscv) && (__riscv_xlen == 64)
+ return (1ULL << 39) - 1; // 0x0000008000000000UL;
# elif defined(__s390x__)
return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
#elif defined(__sparc__)
hifiveu017:1193$
I now get
==2936470==AddressSanitizer CHECK failed:
../../../../gcc-git/libsanitizer/sanitizer_common/sanitizer_allocator_primary64.h:76
"((kSpaceBeg)) == ((address_range.Init(TotalSpaceSize,
PrimaryAllocatorName, kSpaceBeg)))" (0x600000000000,
0xffffffffffffffff)
<empty stack>
so there is still something missing but I think I am closer.
Jim
