[JITLink][RISCV] Add relocation fixup test

[StephenFan]

Summary

This patch add R_RISCV_HI20, R_RISCV_LO12 and R_RISCV_CALL relocation test

[lhames]

I can't speak to the RISC relocation details, but otherwise LGTM.

llvm/test/ExecutionEngine/JITLink/RISCV/ELF_abs_reloc.s

+# RUN: rm -rf %t && mkdir -p %t
+# RUN: llvm-mc -triple=riscv64 -filetype=obj -o %t/elf_riscv64_non_pc_indirect_reloc.o %s
+# RUN: llvm-mc -triple=riscv32 -filetype=obj -o %t/elf_riscv32_non_pc_indirect_reloc.o %s
+# RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000 -define-abs external_data=0xfff10000\
+# RUN:              -check %s %t/elf_riscv64_non_pc_indirect_reloc.o
+# RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000 -define-abs external_data=0xfff10000\
+# RUN:              -check %s %t/elf_riscv32_non_pc_indirect_reloc.o
+#
+
+        .text
+        .file   "testcase.c"
+
+# Empty main entry point.
+        .globl  main
+        .p2align  1
+        .type   main,@function
+main:
+        ret
+
+        .size   main, .-main
+
+# Test R_RISCV_HI20 and R_RISCV_LO12
+
+# jitlink-check: decode_operand(test_abs_rel, 1) = (external_data + 0x800)[31:12]
+# jitlink-check: decode_operand(test_abs_rel+4, 2)[11:0] = (external_data)[11:0]
+  .globl  test_abs_rel
+  .p2align  1
+  .type  test_abs_rel,@function
+test_abs_rel:
+  lui  a0, %hi(external_data)
+  lw  a0, %lo(external_data)(a0)
+
+  .size test_abs_rel, .-test_abs_rel

llvm/test/ExecutionEngine/JITLink/RISCV/ELF_pc_indirect.s

 # RUN: rm -rf %t && mkdir -p %t
 # RUN: llvm-mc -triple=riscv64 -position-independent -filetype=obj -o %t/elf_riscv64_sm_pic_reloc.o %s
 # RUN: llvm-mc -triple=riscv32 -position-independent -filetype=obj -o %t/elf_riscv32_sm_pic_reloc.o %s
 # RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000 \
+# RUN:      -define-abs external_func=0x1 -define-abs external_data=0x2 \
 # RUN:              -check %s %t/elf_riscv64_sm_pic_reloc.o
-# RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000 \
+# RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000\
+# RUN:      -define-abs external_func=0x1 -define-abs external_data=0x2 \
 # RUN:              -check %s %t/elf_riscv32_sm_pic_reloc.o
 #
 # Test ELF small/PIC relocations
 
         .text
         .file   "testcase.c"
 
 # Empty main entry point.
         .globl  main
         .p2align  1
         .type   main,@function
 main:
         ret
 
         .size   main, .-main
 
 # Test R_RISCV_PCREL_HI20 and R_RISCV_PCREL_LO
-# jitlink-check: decode_operand(test_pcrel32, 1) = ((named_data - test_pcrel32) + 0x800)[31:12]
-# jitlink-check: decode_operand(test_pcrel32+4, 2)[11:0] = (named_data - test_pcrel32)[11:0]
+# jitlink-check: decode_operand(test_pcrel32, 1) = ((external_data - test_pcrel32) + 0x800)[31:12]
+# jitlink-check: decode_operand(test_pcrel32+4, 2)[11:0] = (external_data - test_pcrel32)[11:0]
         .globl  test_pcrel32
         .p2align  1
         .type   test_pcrel32,@function
 test_pcrel32:
-        auipc a0, %pcrel_hi(named_data)
+        auipc a0, %pcrel_hi(external_data)
         lw  a0, %pcrel_lo(test_pcrel32)(a0)
 
         .size   test_pcrel32, .-test_pcrel32
 
-        .data
-        .type   named_data,@object
+# Test R_RISCV_CALL
+# jitlink-check: decode_operand(test_call, 1) = ((external_func - test_call) + 0x800)[31:12]
+# jitlink-check: decode_operand(test_call+4, 2)[11:0] = (external_func - test_call)[11:0]
+        .globl test_call
         .p2align  1
-named_data:
-        .quad   42
-        .size   named_data, 4
+        .type  test_call,@function
+test_call:
+        call external_func
+        ret
+        .size test_call, .-test_call