[PATCH] D77879: [ELF][Hexagon] Add duplex to R_HEX_GOT_16_X

[Brian Cain via Phabricator via llvm-commits]

bcain created this revision.
bcain added reviewers: sidneym, MaskRay, ruiu.
Herald added subscribers: arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

Building 'espresso' from llvm-test-suite revealed missing support
for duplex instructions with R_HEX_GOT_16_X.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D77879

Files:
  lld/ELF/Arch/Hexagon.cpp
  lld/test/ELF/hexagon-shared.s


Index: lld/test/ELF/hexagon-shared.s
===================================================================
--- lld/test/ELF/hexagon-shared.s
+++ lld/test/ELF/hexagon-shared.s
@@ -38,6 +38,11 @@
 # R_HEX_GOT_16_X
 r0 = add(r1,##bar at GOT)
 
+# R_HEX_GOT_16_X, duplex
+{ r0 = add(r0,##bar at GOT)
+  memw(r0) = r2 }
+
+
 # foo is local so no plt will be generated
 foo:
   jumpr lr
@@ -78,6 +83,7 @@
 # TEXT: if (p0) jump:nt 0x102d0
 # TEXT: r0 = #0 ; jump 0x102d0
 # TEXT: r0 = add(r1,##-65548)
+# TEXT: r0 = add(r0,##-65548); memw(r0+#0) = r2 }
 
 # GOT: .got:
 # GOT:  00 00 00 00 00000000 <unknown>
Index: lld/ELF/Arch/Hexagon.cpp
===================================================================
--- lld/ELF/Arch/Hexagon.cpp
+++ lld/ELF/Arch/Hexagon.cpp
@@ -161,6 +161,13 @@
   }
 }
 
+static bool isDuplex(uint32_t insn) {
+  // Duplex forms have a fixed mask and parse bits 15:14 are always
+  // zero.  Non-duplex insns will always have at least one bit set in the
+  // parse field.
+  return ((0xC000 & insn) == 0x0);
+}
+
 static uint32_t findMaskR6(uint32_t insn) {
   // There are (arguably too) many relocation masks for the DSP's
   // R_HEX_6_X type.  The table below is used to select the correct mask
@@ -185,10 +192,7 @@
       {0xd7000000, 0x006020e0}, {0xd8000000, 0x006020e0},
       {0xdb000000, 0x006020e0}, {0xdf000000, 0x006020e0}};
 
-  // Duplex forms have a fixed mask and parse bits 15:14 are always
-  // zero.  Non-duplex insns will always have at least one bit set in the
-  // parse field.
-  if ((0xC000 & insn) == 0x0)
+  if (isDuplex(insn))
     return 0x03f00000;
 
   for (InstructionMask i : r6)
@@ -224,6 +228,9 @@
   if ((0xff000000 & insn) == 0xb0000000)
     return 0x0fe03fe0;
 
+  if (isDuplex(insn))
+    return 0x03f00000;
+
   error("unrecognized instruction for R_HEX_16_X relocation: 0x" +
         utohexstr(insn));
   return 0;


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