ld/testsuite/ld-powerpc/pr28827-1.s

   1         .globl  _start
   2         .type   _start,@function
   3         .text
   4 _start:
   5         .cfi_startproc
   6 0:
   7  addis 2,12,(.TOC.-0b)@ha
   8  addi 2,2,(.TOC.-0b)@l
   9         .localentry _start,.-0b
  10  mflr 0
  11  std 0,16(1)
  12  stdu 1,-32(1)
  13         .cfi_def_cfa_offset 32
  14         .cfi_offset 65, 16
  15
  16         .macro call f
  17  bl \f
  18  nop
  19         .endm
  20
  21 # 3000 plt calls, giving over 64k in .plt size.  With a small .got
  22 # this guarantees some plt call stubs can use a 16-bit signed offset
  23 # from .TOC. while others need a 32-bit signed offset (and are larger).
  24
  25         .irpc t4,012
  26         .irpc t3,0123456789
  27         .irpc t2,0123456789
  28         .irpc t1,0123456789
  29         .if \t4
  30         call f\t4\t3\t2\t1
  31         .elseif \t3
  32         call f\t3\t2\t1
  33         .elseif \t2
  34         call f\t2\t1
  35         .else
  36         call f\t1
  37         .endif
  38         .endr
  39         .endr
  40         .endr
  41         .endr
  42
  43  addi 1,1,32
  44         .cfi_def_cfa_offset 0
  45  ld 0,16(1)
  46  mtlr 0
  47         .cfi_restore 65
  48  blr
  49         .cfi_endproc
  50         .size _start,.-_start
  51
  52 # Padding to trigger a stub sizing error with commit 2f83249c13 and
  53 # c804c6f98d (relro changes).  This particular testcase gives a decrease
  54 # in .got to .plt gap after .eh_frame editing, resulting in some plt
  55 # call stubs being smaller.  If the very last one is smaller the size
  56 # error triggers.  Arguably, the ppc64 backend should not report an
  57 # error for shrinkage.  However, the actual PR object files showed an
  58 # *increase* in .got to .plt gap after .eh_frame editing, resulting in
  59 # some plt call stubs being larger.  That hit an assertion failure
  60 # when a long branch stub followed the larger plt call stub and
  61 # overwrote the end of the plt call stub.
  62 # With enough fiddling of this testcase it likely would be possible to
  63 # find the right padding here and .eh_frame sizing to trigger an
  64 # increase in .got to .plt gap.  The point of this testcase is to show
  65 # that the .got to .plt gap should not change after sizing.
  66         .space 50000
  67
  68 # Generate some .eh_frame info that -gc-sections will trim
  69         .macro fundef f
  70         .section .text.\f,"ax",@progbits
  71         .type   \f,@function
  72 \f:
  73         .cfi_startproc
  74  blr
  75         .cfi_endproc
  76         .size \f,.-\f
  77         .endm
  78
  79         .irpc t2,0123456789
  80         .irpc t1,0123456789
  81         fundef dummy\t2\t1
  82         .endr
  83         .endr