[PATCH] D43383: [llvm-mc] - Produce R_X86_64_PLT32 for "call/jmp foo".

[H.J Lu via Phabricator via llvm-commits]

hjl.tools added a comment.

Does this change add reference to _GLOBAL_OFFSET_TABLE_?

[hjl at gnu-tools-1 tmp]$ cat x.s
	call foo
[hjl at gnu-tools-1 tmp]$ cat y.s
	call foo at PLT
[hjl at gnu-tools-1 tmp]$ gcc -c x.s y.s
[hjl at gnu-tools-1 tmp]$ readelf -rs x.o y.o

File: x.o

Relocation section '.rela.text' at offset 0xc8 contains 1 entry:

  Offset          Info           Type           Sym. Value    Sym. Name + Addend

000000000001  000400000004 R_X86_64_PLT32    0000000000000000 foo - 4

Symbol table '.symtab' contains 5 entries:

  Num:    Value          Size Type    Bind   Vis      Ndx Name
    0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
    1: 0000000000000000     0 SECTION LOCAL  DEFAULT    1 
    2: 0000000000000000     0 SECTION LOCAL  DEFAULT    3 
    3: 0000000000000000     0 SECTION LOCAL  DEFAULT    4 
    4: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND foo

File: y.o

Relocation section '.rela.text' at offset 0xf8 contains 1 entry:

  Offset          Info           Type           Sym. Value    Sym. Name + Addend

000000000001  000500000004 R_X86_64_PLT32    0000000000000000 foo - 4

Symbol table '.symtab' contains 6 entries:

  Num:    Value          Size Type    Bind   Vis      Ndx Name
    0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
    1: 0000000000000000     0 SECTION LOCAL  DEFAULT    1 
    2: 0000000000000000     0 SECTION LOCAL  DEFAULT    3 
    3: 0000000000000000     0 SECTION LOCAL  DEFAULT    4 
    4: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND _GLOBAL_OFFSET_TABLE_
    5: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND foo

[hjl at gnu-tools-1 tmp]$

There should be no reference to _GLOBAL_OFFSET_TABLE_ for "call foo".


https://reviews.llvm.org/D43383