[PATCH 06/13] ELF/AArch64: Check linker created dynamic variables

[zatrazz]

Summary

Check the values of _GLOBAL_OFFSET_TABLE_ and _DYNAMIC variables created by
linker. AArch64 version.

test/elf/AArch64/dynamicvars.test

+# Tests that the dynamic variables created by the linker are set to the right
+# values.
+
+#RUN: yaml2obj --format elf -docnum 1 %s -o %t.o
+#RUN: lld -flavor gnu  -target aarch64 -e main %t.o -o %t1 --noinhibit-exec
+#RUN: llvm-readobj -sections -symbols %t1 | FileCheck -check-prefix CHECKSYMS %s
+
+
+#CHECKSYMS:    Name: .dynamic
+#CHECKSYMS:    Type: SHT_DYNAMIC
+#CHECKSYMS:    Address: [[TARGETA:[0xa-fA-f0-9]+]]
+#CHECKSYMS:    Name: .got.plt
+#CHECKSYMS:    Type: SHT_PROGBITS
+#CHECKSYMS:    Address: [[TARGETB:[0xa-fA-f0-9]+]]
+#CHECKSYMS:    Name: _DYNAMIC
+#CHECKSYMS:    Value: [[TARGETA]]
+#CHECKSYMS:    Section: .dynamic
+#CHECKSYMS:    Name: _GLOBAL_OFFSET_TABLE_
+#CHECKSYMS:    Value: [[TARGETB]]
+#CHECKSYMS:    Section: .got.plt
+
+---
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_AARCH64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+  - Name:            .data
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_WRITE, SHF_ALLOC ]
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+  - Name:            .bss
+    Type:            SHT_NOBITS
+    Flags:           [ SHF_WRITE, SHF_ALLOC ]
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+  - Name:            .text.startup
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000000004
+    Content:         FD7BBFA900000090FD030091000000910000009400008052FD7BC1A8C0035FD6
+  - Name:            .rela.text.startup
+    Type:            SHT_RELA
+    Flags:           [ SHF_INFO_LINK ]
+    Link:            .symtab
+    AddressAlign:    0x0000000000000008
+    Info:            .text.startup
+    Relocations:
+      - Offset:          0x0000000000000004
+        Symbol:          .rodata.str1.8
+        Type:            R_AARCH64_ADR_PREL_PG_HI21
+      - Offset:          0x000000000000000C
+        Symbol:          .rodata.str1.8
+        Type:            R_AARCH64_ADD_ABS_LO12_NC
+      - Offset:          0x0000000000000010
+        Symbol:          puts
+        Type:            R_AARCH64_CALL26
+  - Name:            .rodata.str1.8
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_MERGE, SHF_STRINGS ]
+    AddressAlign:    0x0000000000000008
+    Content:         '7465737400000000'
+  - Name:            .comment
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_MERGE, SHF_STRINGS ]
+    AddressAlign:    0x0000000000000001
+    Content:         004743433A2028474E552920342E392E33203230313530333234202870726572656C656173652900
+  - Name:            .note.GNU-stack
+    Type:            SHT_PROGBITS
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+Symbols:
+  Local:
+    - Name:            test.c
+      Type:            STT_FILE
+    - Name:            .text
+      Type:            STT_SECTION
+      Section:         .text
+    - Name:            .data
+      Type:            STT_SECTION
+      Section:         .data
+    - Name:            .bss
+      Type:            STT_SECTION
+      Section:         .bss
+    - Name:            .text.startup
+      Type:            STT_SECTION
+      Section:         .text.startup
+    - Name:            '$x'
+      Section:         .text.startup
+    - Name:            .rodata.str1.8
+      Type:            STT_SECTION
+      Section:         .rodata.str1.8
+    - Name:            '$d'
+      Section:         .rodata.str1.8
+    - Name:            .note.GNU-stack
+      Type:            STT_SECTION
+      Section:         .note.GNU-stack
+    - Name:            .comment
+      Type:            STT_SECTION
+      Section:         .comment
+  Global:
+    - Name:            main
+      Type:            STT_FUNC
+      Section:         .text.startup
+      Size:            0x0000000000000020
+    - Name:            puts
+...