[PATCH] D46456: [asan] Add support for Myriad RTEMS memory map

[Walter Lee via Phabricator via llvm-commits]

waltl created this revision.
waltl added reviewers: vitalybuka, eugenis, alekseyshl.
Herald added a subscriber: kubamracek.

The Myriad RTEMS memory system has a few unique aspects that
require support in the ASan run-time.

- A limited amount of memory (currently 512M).

- No virtual memory, no memory protection.

- DRAM starts at address 0x80000000.  Other parts of memory may be used for MMIO, etc.

- The second highest address bit is the "cache" bit, and 0x80000000 and 0x84000000 alias to the same memory.

To support the above, we make the following changes:

- Use a ShadowScale of 5, to reduce shadow memory overhead.

- Adjust some existing macros to remove assumption that the lowest memory address is 0.

- add a RawAddr macro that on Myriad strips the cache bit from the input address, before using the address for shadow memory (for other archs this does nothing).

- We must check that an address is in DRAM range before using it to index into shadow memory.


Repository:
  rL LLVM

https://reviews.llvm.org/D46456

Files:
  compiler-rt/lib/asan/asan_mapping.h
  compiler-rt/lib/asan/asan_poisoning.cc
  compiler-rt/lib/asan/asan_rtl.cc

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D46456.145273.patch
Type: text/x-patch
Size: 9138 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20180504/7136ad26/attachment.bin>