derek.holloway
7502bf64a4
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62 lines
2.2 KiB
Plaintext
62 lines
2.2 KiB
Plaintext
// Check that marker symbols ($d, $x) denoting data embedded in code are ignored
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// if they fall outside their respective sections.
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// RUN: yaml2obj %S/Inputs/spurious-marker-symbol.yaml -o %t.exe
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// RUN: llvm-bolt %t.exe -o %t.bolt 2>&1 | FileCheck %s
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// CHECK: 1 out of 1 functions were overwritten
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// RUN: llvm-objdump -j .text -d %t.bolt | FileCheck %s -check-prefix=CHECK-DISASM
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// CHECK-DISASM: func
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// CHECK-DISASM: 2a0000: d2800540 mov
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// CHECK-DISASM: 2a0004: d65f03c0 ret
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// The YAML encodes the following assembly and debug information:
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.text
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.globl func
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.type func, %function
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func:
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mov x0, #42
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// $d.42: (symbol in .ignored, with an address in .text)
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ret
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// .eh_frame contains minimal DWARF with a CFA operation on the `ret`. BOLT
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// should ignore the spurious `$d.42`. If it doesn't, then it will stop
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// disassembling after the `mov` and will fail to process the second
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// DW_CFA_def_cfa_offset.
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//
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// CIE
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// length: 00000010
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// CIE_id: 00000000
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// version: 01
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// augmentation:
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// "zR" 7a 52 00
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// - read augmentation data
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// - read FDE pointer encoding
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// code_alignment_factor: 04
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// data_alignment_factor: 78 (-8)
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// return_address_register: 1e (r30 / lr)
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//
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// augmentation data:
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// length: 01
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// FDE pointers are absptr+sdata4 0b
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//
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// initial_instructions:
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// DW_CFA_def_cfa (31, 0): 0c 1f 00
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//
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// Encoding: 10000000'00000000'01'7a5200'04'78'1e'10'0b'0c1f00
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//
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// FDE
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// length: 00000014
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// CIE_pointer: 00000018 (backwards offset from here to CIE)
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// initial_location: 002a0000 (`func` as absptr+sdata4)
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// address_range: 00000008
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// augmentation data:
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// length: 00
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// instructions:
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// DW_CFA_def_cfa_offset (1) 0e 01
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// DW_CFA_advance_loc (1) 41 (`ret` at 0x2a0004)
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// DW_CFA_def_cfa_offset (1) 0e 01 Fails unless $d.42 is ignored.
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// DW_CFA_nop 00 00
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//
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// Encoding: 14000000'18000000'00002a00'08000000'000e0141'0e010000
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