lld/test/ELF/systemz-plt.s

   1 # REQUIRES: systemz
   2 # RUN: echo '.globl bar, weak; .type bar,@function; .type weak,@function; bar: weak:' > %t1.s
   3
   4 # RUN: llvm-mc -filetype=obj -triple=s390x-unknown-linux %t1.s -o %t1.o
   5 # RUN: ld.lld -shared %t1.o -soname=t1.so -o %t1.so
   6 # RUN: llvm-mc -filetype=obj -triple=s390x-unknown-linux %s -o %t.o
   7 # RUN: ld.lld %t.o %t1.so -z separate-code -o %t
   8 # RUN: llvm-readelf -S -s -r -x .got.plt %t | FileCheck %s
   9 # RUN: llvm-objdump -d %t | FileCheck --check-prefixes=DIS %s
  10
  11 # CHECK: Section Headers:
  12 # CHECK: .plt     PROGBITS 0000000001001020 001020 000060 00  AX  0   0 16
  13 # CHECK: .got     PROGBITS 00000000010020d0 0020d0 000018 00  WA  0   0  8
  14 # CHECK: .got.plt PROGBITS 00000000010030e8 0020e8 000010 00  WA  0   0  8
  15
  16 # CHECK: Relocation section '.rela.plt' at offset {{.*}} contains 2 entries:
  17 # CHECK: 00000000010030e8 000000010000000b R_390_JMP_SLOT 0000000000000000 bar + 0
  18 # CHECK: 00000000010030f0 000000020000000b R_390_JMP_SLOT 0000000000000000 weak + 0
  19
  20 ## A canonical PLT has a non-zero st_value. bar and weak are called but their
  21 ## addresses are not taken, so a canonical PLT is not necessary.
  22 # CHECK: Symbol table '.dynsym' contains 3 entries:
  23 # CHECK-NEXT:   Num:    Value          Size Type    Bind   Vis       Ndx Name
  24 # CHECK-NEXT:     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT   UND
  25 # CHECK-NEXT:     1: 0000000000000000     0 FUNC    GLOBAL DEFAULT   UND bar
  26 # CHECK-NEXT:     2: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND weak
  27
  28 ## The .got.plt slots relocated by .rela.plt point to .plt
  29 ## This is required by glibc.
  30 # CHECK: Hex dump of section '.got.plt':
  31 # CHECK-NEXT: 0x010030e8 00000000 0100104e 00000000 0100106e
  32
  33 # DIS: Disassembly of section .text:
  34
  35 # DIS: 0000000001001000 <_start>:
  36 # DIS-NEXT: brasl       %r14, 0x1001012
  37 # DIS-NEXT: brasl       %r14, 0x1001040
  38 # DIS-NEXT: brasl       %r14, 0x1001060
  39
  40 # DIS: 0000000001001012 <foo>:
  41 # DIS-NEXT: br  %r14
  42
  43 # DIS: Disassembly of section .plt:
  44
  45 # DIS: 0000000001001020 <.plt>:
  46 # DIS-NEXT: 1001020: e3 10 f0 38 00 24          stg     %r1, 56(%r15)
  47 # DIS-NEXT: 1001026: c0 10 00 00 08 55          larl    %r1, 0x10020d0
  48 # DIS-NEXT: 100102c: d2 07 f0 30 10 08          mvc     48(8,%r15), 8(%r1)
  49 # DIS-NEXT: 1001032: e3 10 10 10 00 04          lg      %r1, 16(%r1)
  50 # DIS-NEXT: 1001038: 07 f1              br      %r1
  51 # DIS-NEXT: 100103a: 07 00              nopr   %r0
  52 # DIS-NEXT: 100103c: 07 00              nopr   %r0
  53 # DIS-NEXT: 100103e: 07 00              nopr   %r0
  54 # DIS-NEXT: 1001040: c0 10 00 00 10 54          larl    %r1, 0x10030e8
  55 # DIS-NEXT: 1001046: e3 10 10 00 00 04          lg      %r1, 0(%r1)
  56 # DIS-NEXT: 100104c: 07 f1              br      %r1
  57 # DIS-NEXT: 100104e: 0d 10              basr    %r1, 0
  58 # DIS-NEXT: 1001050: e3 10 10 0c 00 14          lgf     %r1, 12(%r1)
  59 # DIS-NEXT: 1001056: c0 f4 ff ff ff e5          jg      0x1001020
  60 # DIS-NEXT: 100105c: 00 00              <unknown>
  61 # DIS-NEXT: 100105e: 00 00              <unknown>
  62 # DIS-NEXT: 1001060: c0 10 00 00 10 48          larl    %r1, 0x10030f0
  63 # DIS-NEXT: 1001066: e3 10 10 00 00 04          lg      %r1, 0(%r1)
  64 # DIS-NEXT: 100106c: 07 f1              br      %r1
  65 # DIS-NEXT: 100106e: 0d 10              basr    %r1, 0
  66 # DIS-NEXT: 1001070: e3 10 10 0c 00 14          lgf     %r1, 12(%r1)
  67 # DIS-NEXT: 1001076: c0 f4 ff ff ff d5          jg      0x1001020
  68 # DIS-NEXT: 100107c: 00 00              <unknown>
  69 # DIS-NEXT: 100107e: 00 18              <unknown>
  70
  71 .global _start, foo, bar
  72 .weak weak
  73
  74 _start:
  75   ## Use @plt to avoid generating direct references that would force
  76   ## allocation of a canonical PLT entry.
  77   brasl %r14, foo@plt
  78   brasl %r14, bar@plt
  79   brasl %r14, weak@plt
  80
  81 ## foo is local and non-preemptable, no PLT is generated.
  82 foo:
  83   br %r14