test/testfiles_for_readelf/note_gnu_property.S

   1 /**
   2  * Test ELF for .note.gnu.property, built on x86-64.
   3  *
   4  * Object file:
   5  *     gcc -c note_gnu_property.S -o note_gnu_property.o.elf
   6  *
   7  * ELF executable (to also have a PT_GNU_PROPERTY program header):
   8  *     gcc -DEXE -c note_gnu_property.S -o /tmp/x.o
   9  *     ld /tmp/x.o -o note_gnu_property.elf
  10  *     strip
  11  */
  12
  13 // https://github.com/hjl-tools/linux-abi/wiki/linux-abi-draft.pdf
  14 #define NT_GNU_PROPERTY_TYPE_0            5
  15 #define GNU_PROPERTY_STACK_SIZE           1
  16 #define GNU_PROPERTY_NO_COPY_ON_PROTECTED 2
  17 #define GNU_PROPERTY_LOPROC               0xc0000000
  18 #define GNU_PROPERTY_HIPROC               0xdfffffff
  19 #define GNU_PROPERTY_LOUSER               0xe0000000
  20 #define GNU_PROPERTY_HIUSER               0xffffffff
  21
  22 // Unknown property types for testing purposes
  23 #define GNU_PROPERTY_TEST_UNKNOWN         0x12345678
  24 #define GNU_PROPERTY_TEST_UNKNOWN_PROC    0xc1234567
  25 #define GNU_PROPERTY_TEST_UNKNOWN_USER    0xe1234567
  26
  27 // https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/x86-64-psABI
  28 #define GNU_PROPERTY_X86_FEATURE_1_AND    0xc0000002
  29 #define GNU_PROPERTY_X86_FEATURE_1_IBT    0x00000001
  30 #define GNU_PROPERTY_X86_FEATURE_1_SHSTK  0x00000002
  31
  32 #ifdef __x86_64__
  33 #define ALIGN .p2align 3
  34 #else
  35 #define ALIGN .p2align 2
  36 #endif
  37
  38 .section ".text"
  39 .global _start
  40 _start:
  41         ud2
  42
  43 .section ".note.gnu.property", "a"
  44         ALIGN
  45         .long 1f - 0f                // n_namesz
  46         .long end - 2f               // n_descsz
  47         .long NT_GNU_PROPERTY_TYPE_0 // n_type
  48 0:      .asciz "GNU"                 // n_name
  49 1:
  50         ALIGN
  51 2:      .long GNU_PROPERTY_STACK_SIZE // pr_type
  52         .long 4f - 3f                 // pr_datasz
  53 3:
  54         .dc.a 0x123000
  55 4:
  56         ALIGN
  57         .long GNU_PROPERTY_NO_COPY_ON_PROTECTED // pr_type
  58         .long 0                                 // pr_datasz
  59         ALIGN
  60
  61 // Avoid these if linking to executable, linkers may not recognize them
  62 #ifndef EXE
  63         .long GNU_PROPERTY_TEST_UNKNOWN // pr_type
  64         .long 6f-5f                     // pr_datasz
  65 5:
  66         .ascii "hello world"
  67 6:
  68         ALIGN
  69         .long GNU_PROPERTY_TEST_UNKNOWN_PROC // pr_type
  70         .long 8f-7f                          // pr_datasz
  71 7:
  72         .ascii "foobar"
  73 8:
  74         ALIGN
  75         .long GNU_PROPERTY_TEST_UNKNOWN_USER // pr_type
  76         .long 10f-9f                         // pr_datasz
  77 9:
  78         .ascii "bazquuz"
  79 10:
  80         ALIGN
  81 #endif
  82
  83 /* TODO: add support for these later...
  84 6:      .long GNU_PROPERTY_X86_FEATURE_1_AND // pr_type.
  85         .long 8f - 7f                        // pr_datasz
  86 7:
  87         .long GNU_PROPERTY_X86_FEATURE_1_IBT|GNU_PROPERTY_X86_FEATURE_1_SHSTK
  88 8:
  89         ALIGN
  90 */
  91 end: