| # An example of a function which has been split into two parts. Roughly |
| # corresponds to this C code. |
| # int baz() { return 47; } |
| # int bar() { return foo(0); } |
| # int foo(int flag) { return flag ? bar() : baz(); } |
| # int main() { return foo(1); } |
| # The function bar has been placed "in the middle" of foo. The functions are not |
| # using the frame pointer register and the are deliberately adjusting the stack |
| # pointer to test that we're using the correct unwind row. |
| |
| .text |
| |
| .type baz,@function |
| baz: |
| .cfi_startproc |
| movl $47, %eax |
| retq |
| .cfi_endproc |
| .Lbaz_end: |
| .size baz, .Lbaz_end-baz |
| |
| foo.__part.3: |
| .cfi_startproc |
| .cfi_def_cfa_offset 32 |
| .cfi_offset %rbx, -16 |
| addq $24, %rsp |
| .cfi_def_cfa %rsp, 8 |
| retq |
| .Lfoo.__part.3_end: |
| .size foo.__part.3, .Lfoo.__part.3_end-foo.__part.3 |
| .cfi_endproc |
| |
| # NB: Deliberately inserting padding to separate the two parts of the function |
| # as we're currently only parsing a single FDE entry from a (coalesced) address |
| # range. |
| nop |
| |
| foo.__part.1: |
| .cfi_startproc |
| .cfi_def_cfa_offset 32 |
| .cfi_offset %rbx, -16 |
| subq $16, %rsp |
| .cfi_def_cfa_offset 48 |
| callq bar |
| addq $16, %rsp |
| .cfi_def_cfa_offset 32 |
| jmp foo.__part.3 |
| .Lfoo.__part.1_end: |
| .size foo.__part.1, .Lfoo.__part.1_end-foo.__part.1 |
| .cfi_endproc |
| |
| bar: |
| .cfi_startproc |
| subq $88, %rsp |
| .cfi_def_cfa_offset 96 |
| xorl %edi, %edi |
| callq foo |
| addq $88, %rsp |
| .cfi_def_cfa %rsp, 8 |
| retq |
| .cfi_endproc |
| .Lbar_end: |
| .size bar, .Lbar_end-bar |
| |
| .type foo,@function |
| foo: |
| .cfi_startproc |
| pushq %rbx |
| .cfi_def_cfa_offset 16 |
| .cfi_offset %rbx, -16 |
| movl %edi, %ebx |
| cmpl $0, %ebx |
| je foo.__part.2 |
| subq $16, %rsp |
| .cfi_def_cfa_offset 32 |
| jmp foo.__part.1 |
| .cfi_endproc |
| .Lfoo_end: |
| .size foo, .Lfoo_end-foo |
| |
| # NB: Deliberately inserting padding to separate the two parts of the function |
| # as we're currently only parsing a single FDE entry from a (coalesced) address |
| # range. |
| nop |
| |
| foo.__part.2: |
| .cfi_startproc |
| .cfi_def_cfa_offset 16 |
| .cfi_offset %rbx, -16 |
| subq $16, %rsp |
| .cfi_def_cfa_offset 32 |
| callq baz |
| jmp foo.__part.3 |
| .Lfoo.__part.2_end: |
| .size foo.__part.2, .Lfoo.__part.2_end-foo.__part.2 |
| .cfi_endproc |
| |
| .globl main |
| .type main,@function |
| main: |
| .cfi_startproc |
| movl $1, %edi |
| callq foo |
| retq |
| .cfi_endproc |
| .Lmain_end: |
| .size main, .Lmain_end-main |
| |
| .section .debug_abbrev,"",@progbits |
| .byte 1 # Abbreviation Code |
| .byte 17 # DW_TAG_compile_unit |
| .byte 1 # DW_CHILDREN_yes |
| .byte 37 # DW_AT_producer |
| .byte 8 # DW_FORM_string |
| .byte 19 # DW_AT_language |
| .byte 5 # DW_FORM_data2 |
| .byte 17 # DW_AT_low_pc |
| .byte 1 # DW_FORM_addr |
| .byte 85 # DW_AT_ranges |
| .byte 35 # DW_FORM_rnglistx |
| .byte 116 # DW_AT_rnglists_base |
| .byte 23 # DW_FORM_sec_offset |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 2 # Abbreviation Code |
| .byte 46 # DW_TAG_subprogram |
| .byte 0 # DW_CHILDREN_no |
| .byte 17 # DW_AT_low_pc |
| .byte 1 # DW_FORM_addr |
| .byte 18 # DW_AT_high_pc |
| .byte 1 # DW_FORM_addr |
| .byte 3 # DW_AT_name |
| .byte 8 # DW_FORM_string |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 3 # Abbreviation Code |
| .byte 46 # DW_TAG_subprogram |
| .byte 1 # DW_CHILDREN_yes |
| .byte 85 # DW_AT_ranges |
| .byte 35 # DW_FORM_rnglistx |
| .byte 64 # DW_AT_frame_base |
| .byte 24 # DW_FORM_exprloc |
| .byte 3 # DW_AT_name |
| .byte 8 # DW_FORM_string |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 4 # Abbreviation Code |
| .byte 5 # DW_TAG_formal_parameter |
| .byte 0 # DW_CHILDREN_no |
| .byte 2 # DW_AT_location |
| .byte 24 # DW_FORM_exprloc |
| .byte 3 # DW_AT_name |
| .byte 8 # DW_FORM_string |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 5 # Abbreviation Code |
| .byte 36 # DW_TAG_base_type |
| .byte 0 # DW_CHILDREN_no |
| .byte 3 # DW_AT_name |
| .byte 8 # DW_FORM_string |
| .byte 62 # DW_AT_encoding |
| .byte 11 # DW_FORM_data1 |
| .byte 11 # DW_AT_byte_size |
| .byte 11 # DW_FORM_data1 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 0 # EOM(3) |
| |
| .section .debug_info,"",@progbits |
| .Lcu_begin0: |
| .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit |
| .Ldebug_info_start0: |
| .short 5 # DWARF version number |
| .byte 1 # DWARF Unit Type |
| .byte 8 # Address Size (in bytes) |
| .long .debug_abbrev # Offset Into Abbrev. Section |
| .byte 1 # Abbrev [1] DW_TAG_compile_unit |
| .asciz "Hand-written DWARF" # DW_AT_producer |
| .short 29 # DW_AT_language |
| .quad 0 # DW_AT_low_pc |
| .byte 1 # DW_AT_ranges |
| .long .Lrnglists_table_base0 # DW_AT_rnglists_base |
| .byte 2 # Abbrev [2] DW_TAG_subprogram |
| .quad baz # DW_AT_low_pc |
| .quad .Lbaz_end # DW_AT_high_pc |
| .asciz "baz" # DW_AT_name |
| .byte 2 # Abbrev [2] DW_TAG_subprogram |
| .quad bar # DW_AT_low_pc |
| .quad .Lbar_end # DW_AT_high_pc |
| .asciz "bar" # DW_AT_name |
| .byte 3 # Abbrev [3] DW_TAG_subprogram |
| .byte 0 # DW_AT_ranges |
| .byte 1 # DW_AT_frame_base |
| .byte 86 |
| .asciz "foo" # DW_AT_name |
| .byte 4 # Abbrev [4] DW_TAG_formal_parameter |
| .byte 1 # DW_AT_location |
| .byte 0x53 # DW_OP_reg3 |
| .asciz "flag" # DW_AT_name |
| .long .Lint-.Lcu_begin0 # DW_AT_type |
| .byte 0 # End Of Children Mark |
| .byte 2 # Abbrev [2] DW_TAG_subprogram |
| .quad main # DW_AT_low_pc |
| .quad .Lmain_end # DW_AT_high_pc |
| .asciz "main" # DW_AT_name |
| .Lint: |
| .byte 5 # Abbrev [5] DW_TAG_base_type |
| .asciz "int" # DW_AT_name |
| .byte 5 # DW_AT_encoding |
| .byte 4 # DW_AT_byte_size |
| .byte 0 # End Of Children Mark |
| .Ldebug_info_end0: |
| |
| .section .debug_rnglists,"",@progbits |
| .long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length |
| .Ldebug_list_header_start0: |
| .short 5 # Version |
| .byte 8 # Address size |
| .byte 0 # Segment selector size |
| .long 2 # Offset entry count |
| .Lrnglists_table_base0: |
| .long .Ldebug_ranges0-.Lrnglists_table_base0 |
| .long .Ldebug_ranges1-.Lrnglists_table_base0 |
| .Ldebug_ranges0: |
| .byte 6 # DW_RLE_start_end |
| .quad foo |
| .quad .Lfoo_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.1 |
| .quad .Lfoo.__part.1_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.2 |
| .quad .Lfoo.__part.2_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.3 |
| .quad .Lfoo.__part.3_end |
| .byte 0 # DW_RLE_end_of_list |
| .Ldebug_ranges1: |
| .byte 6 # DW_RLE_start_end |
| .quad baz |
| .quad .Lbaz_end |
| .byte 6 # DW_RLE_start_end |
| .quad bar |
| .quad .Lbar_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.1 |
| .quad .Lfoo.__part.1_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.2 |
| .quad .Lfoo.__part.2_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo.__part.3 |
| .quad .Lfoo.__part.3_end |
| .byte 6 # DW_RLE_start_end |
| .quad foo |
| .quad .Lfoo_end |
| .byte 6 # DW_RLE_start_end |
| .quad main |
| .quad .Lmain_end |
| .byte 0 # DW_RLE_end_of_list |
| .Ldebug_list_header_end0: |
| |
| .section ".note.GNU-stack","",@progbits |
