| # 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. | |
| .att_syntax | |
| .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 |