diff options
Diffstat (limited to 'lib/Support/Unix/Memory.inc')
| -rw-r--r-- | lib/Support/Unix/Memory.inc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Support/Unix/Memory.inc b/lib/Support/Unix/Memory.inc index 40d6b3f..e00394e 100644 --- a/lib/Support/Unix/Memory.inc +++ b/lib/Support/Unix/Memory.inc @@ -51,7 +51,18 @@ int getPosixProtectionFlags(unsigned Flags) { llvm::sys::Memory::MF_EXEC: return PROT_READ | PROT_WRITE | PROT_EXEC; case llvm::sys::Memory::MF_EXEC: +#if defined(__FreeBSD__) + // On PowerPC, having an executable page that has no read permission + // can have unintended consequences. The function InvalidateInstruction- + // Cache uses instructions dcbf and icbi, both of which are treated by + // the processor as loads. If the page has no read permissions, + // executing these instructions will result in a segmentation fault. + // Somehow, this problem is not present on Linux, but it does happen + // on FreeBSD. + return PROT_READ | PROT_EXEC; +#else return PROT_EXEC; +#endif default: llvm_unreachable("Illegal memory protection flag specified!"); } |