[Hexagon] Add R_HEX_GD_PLT_B22/32_PCREL relocations

Extended versions of GD_PLT_B22_PCREL. These surface when -mlong-calls
is used.

Differential Revision: https://reviews.llvm.org/D79191

Author: SidManning

lld/ELF/Arch/Hexagon.cpp

@@ -120,6 +120,8 @@ RelExpr Hexagon::getRelExpr(RelType type, const Symbol &s,
   case R_HEX_B22_PCREL_X:
   case R_HEX_B32_PCREL_X:
   case R_HEX_GD_PLT_B22_PCREL:
+  case R_HEX_GD_PLT_B22_PCREL_X:
+  case R_HEX_GD_PLT_B32_PCREL_X:
     return R_PLT_PC;
   case R_HEX_IE_32_6_X:
   case R_HEX_IE_16_X:
@@ -311,16 +313,18 @@ void Hexagon::relocate(uint8_t *loc, const Relocation &rel,
   case R_HEX_B15_PCREL_X:
     or32le(loc, applyMask(0x00df20fe, val & 0x3f));
     break;
-  case R_HEX_GD_PLT_B22_PCREL:
   case R_HEX_B22_PCREL:
+  case R_HEX_GD_PLT_B22_PCREL:
   case R_HEX_PLT_B22_PCREL:
     checkInt(loc, val, 22, rel);
     or32le(loc, applyMask(0x1ff3ffe, val >> 2));
     break;
   case R_HEX_B22_PCREL_X:
+  case R_HEX_GD_PLT_B22_PCREL_X:
     or32le(loc, applyMask(0x1ff3ffe, val & 0x3f));
     break;
   case R_HEX_B32_PCREL_X:
+  case R_HEX_GD_PLT_B32_PCREL_X:
     or32le(loc, applyMask(0x0fff3fff, val >> 6));
     break;
   case R_HEX_GOTREL_HI16:

lld/ELF/Relocations.cpp

@@ -1344,8 +1344,11 @@ static void scanReloc(InputSectionBase &sec, OffsetGetter &getOffset, RelTy *&i,
         addend &= ~0x8000;
       // R_HEX_GD_PLT_B22_PCREL (call a@GDPLT) is transformed into
       // call __tls_get_addr even if the symbol is non-preemptible.
-      if (!(config->emachine == EM_HEXAGON && type == R_HEX_GD_PLT_B22_PCREL))
-        expr = fromPlt(expr);
+      if (!(config->emachine == EM_HEXAGON &&
+           (type == R_HEX_GD_PLT_B22_PCREL ||
+            type == R_HEX_GD_PLT_B22_PCREL_X ||
+            type == R_HEX_GD_PLT_B32_PCREL_X)))
+      expr = fromPlt(expr);
     }
   }
 

lld/test/ELF/hexagon-tls-gd-nonpreemptible.s

@@ -3,6 +3,7 @@
 # RUN: llvm-mc -filetype=obj -triple=hexagon-unknown-elf %s -o %t.o
 # RUN: ld.lld -shared %t.o -o %t.so
 # RUN: llvm-readobj -r %t.so | FileCheck --check-prefix=RELOC %s
+# RUN: llvm-readobj -r %t.o | FileCheck --check-prefix=REL %s
 # RUN: llvm-objdump -d --no-show-raw-insn --print-imm-hex %t.so | FileCheck %s
 
 ## Prior to D77021 lld would error "relocation R_HEX_GD_PLT_B22_PCREL cannot refer to absolute symbol".
@@ -17,17 +18,28 @@
 # RELOC-NEXT:   R_HEX_JMP_SLOT __tls_get_addr 0x0
 # RELOC-NEXT: }
 
+# REL:      R_HEX_B32_PCREL_X _GLOBAL_OFFSET_TABLE_ 0x0
+# REL-NEXT: R_HEX_6_PCREL_X _GLOBAL_OFFSET_TABLE_ 0x4
+# REL-NEXT: R_HEX_GD_GOT_32_6_X a 0x0
+# REL-NEXT: R_HEX_GD_GOT_16_X a 0x0
+# REL-NEXT: R_HEX_GD_PLT_B22_PCREL a 0x0
+# REL-NEXT: R_HEX_GD_PLT_B32_PCREL_X a 0x0
+# REL-NEXT: R_HEX_GD_PLT_B22_PCREL_X a 0x4
+
 # CHECK:      { immext(#{{.*}})
 # CHECK-NEXT:   r2 = add(pc,##{{.*}}) }
 # CHECK-NEXT: { immext(#{{.*}})
 # CHECK-NEXT:   r0 = add(r2,##-{{.*}}) }
 # CHECK-NEXT: { call {{.*}} }
+# CHECK-NEXT: {	immext({{.*}})
+# CHECK-NEXT:  	call {{.*}} }
 # CHECK-NEXT: { r0 = memw(r0+#0x0) }
 
 _start:
   r2 = add(pc,##_GLOBAL_OFFSET_TABLE_@PCREL)
   r0 = add(r2,##a@GDGOT)
   call a@GDPLT
+  call ##a@GDPLT
   r0 = memw(r0+#0)
 
 ## a is non-preemptible due to STV_HIDDEN visibility.