[Bug ld/31848] New: aarch64: incorrect relative relocation for ABS symbols

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31848

            Bug ID: 31848
           Summary: aarch64: incorrect relative relocation for ABS symbols
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: nsz at gcc dot gnu.org
  Target Milestone: ---

relative relocation against an abs symbol is wrong, the GOT entry should be
initialized to the abs symbol value without dynamic relocation for it.

$ cat abs-got.s
.text
.global _start
_start:
        adrp    x0, :got:sym_global_abs
        ldr     x0, [x0, :got_lo12:sym_global_abs]

        adrp    x0, :got:sym_weak_abs
        ldr     x0, [x0, :got_lo12:sym_weak_abs]

        adrp    x0, :got:sym_hidden_abs
        ldr     x0, [x0, :got_lo12:sym_hidden_abs]

        adrp    x0, :got:sym_forced_local_abs
        ldr     x0, [x0, :got_lo12:sym_forced_local_abs]

        adrp    x0, :got:sym_local_abs
        ldr     x0, [x0, :got_lo12:sym_local_abs]

.global sym_global_abs
.set sym_global_abs, 42

.weak sym_weak_abs
.set sym_weak_abs, 42

.global sym_hidden_abs
.hidden sym_hidden_abs
.set sym_hidden_abs, 42

.global sym_forced_local_abs
.set sym_forced_local_abs, 42

.set sym_local_abs, 42
$ cat abs-got.lds
{ local: sym_forced_local_abs; };
$ aarch64-linux-gnu-as -o abs-got.o abs-got.s 
$ aarch64-linux-gnu-ld -pie --version-script=abs-got.lds abs-got.o
$ aarch64-linux-gnu-readelf -rW a.out

Relocation section '.rela.dyn' at offset 0x220 contains 5 entries:
    Offset             Info             Type               Symbol's Value 
Symbol's Name + Addend
000000000001ffc0  0000000000000403 R_AARCH64_RELATIVE                        2a
000000000001ffc8  0000000000000403 R_AARCH64_RELATIVE                        2a
000000000001ffd0  0000000000000403 R_AARCH64_RELATIVE                        2a
000000000001ffd8  0000000000000403 R_AARCH64_RELATIVE                        2a
000000000001ffe0  0000000000000403 R_AARCH64_RELATIVE                        2a
$ aarch64-linux-gnu-readelf -sW a.out |grep sym_
    13: 000000000000002a     0 NOTYPE  LOCAL  DEFAULT  ABS sym_local_abs
    16: 000000000000002a     0 NOTYPE  LOCAL  DEFAULT  ABS sym_forced_local_abs
    18: 000000000000002a     0 NOTYPE  GLOBAL HIDDEN   ABS sym_hidden_abs
    24: 000000000000002a     0 NOTYPE  GLOBAL DEFAULT  ABS sym_global_abs
    28: 000000000000002a     0 NOTYPE  WEAK   DEFAULT  ABS sym_weak_abs

$ aarch64-linux-gnu-ld -z pack-relative-relocs -pie
--version-script=abs-got.lds abs-got.o
$ aarch64-linux-gnu-readelf -rW a.out

Relocation section '.rela.dyn' at offset 0x220 contains 4 entries:
    Offset             Info             Type               Symbol's Value 
Symbol's Name + Addend
0000000000000000  0000000000000000 R_AARCH64_NONE                            0
0000000000000000  0000000000000000 R_AARCH64_NONE                            0
0000000000000000  0000000000000000 R_AARCH64_NONE                            0
0000000000000000  0000000000000000 R_AARCH64_NONE                            0

Relocation section '.relr.dyn' at offset 0x280 contains 1 entry which relocates
1 location:
Index: Entry            Address           Symbolic Address
0000:  000000000001ffc0 000000000001ffc0  _GLOBAL_OFFSET_TABLE_ + 0x8

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