[PATCH] D66277: [ELF][AArch64] Improve error message for unknown relocations

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: grimar, peter.smith, ruiu.
Herald added subscribers: llvm-commits, kristof.beyls, arichardson, javed.absar, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

Like rLLD354040 <https://reviews.llvm.org/rLLD354040>.

Previously, for unrecognized relocation types, in -no-pie mode, we got something like:

  foo.o: unrecognized reloc 256

In -pie/-shared mode:

  error: can't create dynamic relocation ... against symbol: yyy in readonly segment


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D66277

Files:
  ELF/Arch/AArch64.cpp


Index: ELF/Arch/AArch64.cpp
===================================================================
--- ELF/Arch/AArch64.cpp
+++ ELF/Arch/AArch64.cpp
@@ -76,6 +76,26 @@
 RelExpr AArch64::getRelExpr(RelType type, const Symbol &s,
                             const uint8_t *loc) const {
   switch (type) {
+  case R_AARCH64_ABS16:
+  case R_AARCH64_ABS32:
+  case R_AARCH64_ABS64:
+  case R_AARCH64_ADD_ABS_LO12_NC:
+  case R_AARCH64_LDST128_ABS_LO12_NC:
+  case R_AARCH64_LDST16_ABS_LO12_NC:
+  case R_AARCH64_LDST32_ABS_LO12_NC:
+  case R_AARCH64_LDST64_ABS_LO12_NC:
+  case R_AARCH64_LDST8_ABS_LO12_NC:
+  case R_AARCH64_MOVW_SABS_G0:
+  case R_AARCH64_MOVW_SABS_G1:
+  case R_AARCH64_MOVW_SABS_G2:
+  case R_AARCH64_MOVW_UABS_G0:
+  case R_AARCH64_MOVW_UABS_G0_NC:
+  case R_AARCH64_MOVW_UABS_G1:
+  case R_AARCH64_MOVW_UABS_G1_NC:
+  case R_AARCH64_MOVW_UABS_G2:
+  case R_AARCH64_MOVW_UABS_G2_NC:
+  case R_AARCH64_MOVW_UABS_G3:
+    return R_ABS;
   case R_AARCH64_TLSDESC_ADR_PAGE21:
     return R_AARCH64_TLSDESC_PAGE;
   case R_AARCH64_TLSDESC_LD64_LO12:
@@ -126,7 +146,9 @@
   case R_AARCH64_NONE:
     return R_NONE;
   default:
-    return R_ABS;
+    error(getErrorLocation(loc) + "unknown relocation (" + Twine(type) +
+          ") against symbol " + toString(s));
+    return R_NONE;
   }
 }
 
@@ -421,7 +443,7 @@
     or32AArch64Imm(loc, val);
     break;
   default:
-    error(getErrorLocation(loc) + "unrecognized relocation " + toString(type));
+    llvm_unreachable("unknown relocation");
   }
 }
 


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