[PATCH] D149346: [compiler-rt][interception][win] Add error messages for some errors

[Alvin Wong via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG1a7a00bdc99f: [compiler-rt][interception][win] Add error messages for some errors (authored by alvinhochun).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149346/new/

https://reviews.llvm.org/D149346

Files:
  compiler-rt/lib/interception/interception_win.cpp


Index: compiler-rt/lib/interception/interception_win.cpp
===================================================================
--- compiler-rt/lib/interception/interception_win.cpp
+++ compiler-rt/lib/interception/interception_win.cpp
@@ -270,8 +270,13 @@
 }
 
 static void WriteJumpInstruction(uptr from, uptr target) {
-  if (!DistanceIsWithin2Gig(from + kJumpInstructionLength, target))
+  if (!DistanceIsWithin2Gig(from + kJumpInstructionLength, target)) {
+    ReportError(
+        "interception_win: cannot write jmp further than 2GB away, from %p to "
+        "%p.\n",
+        (void *)from, (void *)target);
     InterceptionFailed();
+  }
   ptrdiff_t offset = target - from - kJumpInstructionLength;
   *(u8*)from = 0xE9;
   *(u32*)(from + 1) = offset;
@@ -295,6 +300,10 @@
   int offset = indirect_target - from - kIndirectJumpInstructionLength;
   if (!DistanceIsWithin2Gig(from + kIndirectJumpInstructionLength,
                             indirect_target)) {
+    ReportError(
+        "interception_win: cannot write indirect jmp with target further than "
+        "2GB away, from %p to %p.\n",
+        (void *)from, (void *)indirect_target);
     InterceptionFailed();
   }
   *(u16*)from = 0x25FF;


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