lld/test/COFF/gfids-relocations32.s

   1 # REQUIRES: x86
   2 # RUN: llvm-mc -triple i686-pc-win32 %s -filetype=obj -o %t.obj
   3 # RUN: lld-link -safeseh:no %t.obj -guard:cf -out:%t.exe -entry:main
   4 # RUN: llvm-readobj --coff-load-config %t.exe | FileCheck %s --check-prefix=CHECK
   5
   6 # Only f and _main should go in the table.
   7 # (use /lldmap:map.txt to check their addresses).
   8 #
   9 # CHECK: GuardFidTable [
  10 # CHECK-NEXT: 0x401000
  11 # CHECK-NEXT: 0x401030
  12 # CHECK-NEXT: ]
  13
  14 # The input was loosely based on studying this program:
  15 #
  16 #  void foo() { return; }
  17 #  void bar() { return; }
  18 #  int main() {
  19 #    foo();
  20 #    void (*arr[])() = { &bar };
  21 #    (*arr[0])();
  22 #    return 0;
  23 #  }
  24 # cl /c a.cc && dumpbin /disasm a.obj > a.txt &&
  25 #   link a.obj /guard:cf /map:map.txt && dumpbin /loadconfig a.exe
  26
  27
  28
  29         .def    f;
  30         .scl    3;
  31         .type   32;
  32         .endef
  33         .section       .text,"xr",one_only,f
  34         .p2align 4
  35 f:      movl $1, %eax
  36         ret
  37
  38
  39         .def    g;
  40         .scl    3;
  41         .type   32;
  42         .endef
  43         .section       .text,"xr",one_only,g
  44         .p2align 4
  45 g:      movl $2, %eax
  46         ret
  47
  48
  49         .def    label;
  50         .scl    6;     # StorageClass: Label
  51         .type   0;     # Type: Not a function.
  52         .endef
  53         .section       .text,"xr",one_only,label
  54         .p2align 4
  55 label:  ret
  56
  57
  58         .data
  59         .globl fp
  60         .p2align 4
  61 fp:     .long f        # DIR32 relocation to function
  62         .long label    # DIR32 relocation to label
  63
  64
  65         .def    _main;
  66         .scl    2;
  67         .type   32;
  68         .endef
  69         .section       .text,"xr",one_only,_main
  70         .globl  _main
  71         .p2align 4
  72 _main:  call *fp       # DIR32 relocation to data
  73         call g         # REL32 relocation to function
  74         ret
  75
  76
  77 # Load configuration directory entry (winnt.h _IMAGE_LOAD_CONFIG_DIRECTORY32).
  78 # The linker will define the ___guard_* symbols.
  79         .section .rdata,"dr"
  80 .globl __load_config_used
  81 __load_config_used:
  82         .long 104  # Size.
  83         .fill 76, 1, 0
  84         .long ___guard_fids_table
  85         .long ___guard_fids_count
  86         .long ___guard_flags
  87         .fill 12, 1, 0