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Binary Optimization and Layout Tool - A linux command-line utility used for optimizing performance of binaries
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A fatal error about -update-debug-sections #308

Closed CcWeapon closed 2 years ago

CcWeapon commented 2 years ago

When I wanted to use -update-debug-sections to keep the debug info, I encountered an error.

LLVM ERROR: Relocation type not implemented yet!
 #0 0x0000aaaace788474 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x0000aaaace7864dc SignalHandler(int) Signals.cpp:0:0
 #2 0x0000ffffb5f8c5c0 (linux-vdso.so.1+0x5c0)
 #3 0x0000ffffb5aabcd8 raise /build/glibc-70LW9c/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #4 0x0000ffffb5a98a28 abort /build/glibc-70LW9c/glibc-2.31/stdlib/abort.c:81:7
 #5 0x0000aaaace71cc94 llvm::report_fatal_error(llvm::Twine const&, bool) (~/bolt/build/bin/llvm-bolt+0xb13c94)
 #6 0x0000aaaace71cde4 (~/bolt/build/bin/llvm-bolt+0xb13de4)
 #7 0x0000aaaace8a1e1c llvm::RuntimeDyldELF::resolveAArch64Relocation(llvm::SectionEntry const&, unsigned long, unsigned long, unsigned int, long) (~/bolt/build/bin/llvm-bolt+0xc98e1c)
 #8 0x0000aaaace891850 llvm::RuntimeDyldImpl::resolveRelocationList(llvm::SmallVector<llvm::RelocationEntry, 64u> const&, unsigned long) (~/bolt/build/bin/llvm-bolt+0xc88850)
 #9 0x0000aaaace8919e4 llvm::RuntimeDyldImpl::resolveLocalRelocations() (~/bolt/build/bin/llvm-bolt+0xc889e4)
#10 0x0000aaaace898b54 llvm::RuntimeDyldImpl::resolveRelocations() (~/bolt/build/bin/llvm-bolt+0xc8fb54)
#11 0x0000aaaace898d00 llvm::RuntimeDyld::finalizeWithMemoryManagerLocking() (~/bolt/build/bin/llvm-bolt+0xc8fd00)
#12 0x0000aaaace5c53b8 llvm::bolt::RewriteInstance::emitAndLink() (~/bolt/build/bin/llvm-bolt+0x9bc3b8)
#13 0x0000aaaace5ca0ec llvm::bolt::RewriteInstance::run() (~/bolt/build/bin/llvm-bolt+0x9c10ec)
#14 0x0000aaaacdef5fe4 main (~/bolt/build/bin/llvm-bolt+0x2ecfe4)
#15 0x0000ffffb5a98d50 __libc_start_main /build/glibc-70LW9c/glibc-2.31/csu/../csu/libc-start.c:342:3
#16 0x0000aaaacdf4addc _start (~/bolt/build/bin/llvm-bolt+0x341ddc)
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ~/bolt/build/bin/llvm-bolt libart-compiler.so -o libart-compiler.so.bolt -data=compiler.fdata -reorder-blocks=cache+ -reorder-functions=hfsort -split-eh -dyno-stats -update-debug-sections
Aborted (core dumped)

After the following temporary modification, the program can run properly. However, I think that it is unreasonable to modify llvm. You need to modify it.

As shown in the preceding figure, R_AARCH64_NONE in the section such as .rela.debug_loc is not processed in the current context. How do I process them?

diff --git a/cpu-bolt/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp b/cpu-bolt/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
index 0de76ab78..4f54aa8d1 100644
--- a/cpu-bolt/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ b/cpu-bolt/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -420,7 +420,7 @@ void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,

   switch (Type) {
   default:
-    report_fatal_error("Relocation type not implemented yet!");
+    // report_fatal_error("Relocation type not implemented yet!");
     break;
   case ELF::R_AARCH64_ABS16: {
     uint64_t Result = Value + Addend;

The following figure shows the relocation information read from the elf file.

Relocation section '.rela.debug_loc' at offset 0x1855240 contains 205385 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000008  000000000000 R_AARCH64_NONE                       0
00000000004e  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be0f8
000000000094  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be0f8
0000000000dd  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be0f8
000000000123  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be0f8
000000000169  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be138
0000000001b2  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 1be17c
0000000001f8  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 14
000000000241  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 14
00000000028e  001600000101 R_AARCH64_ABS64   0000000000200000 .text + 14

****************************************************************************************************

There are 41 section headers, starting at offset 0xaec1a80:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .note.android.ide NOTE             0000000000000270  00000270
       0000000000000018  0000000000000000   A       0     0     4
  [ 2] .note.gnu.build-i NOTE             0000000000000288  00000288
       0000000000000020  0000000000000000   A       0     0     4
  [ 3] .dynsym           DYNSYM           00000000000002a8  000002a8
       0000000000018d38  0000000000000018   A       7     1     8
  [ 4] .gnu.version      VERSYM           0000000000018fe0  00018fe0
       000000000000211a  0000000000000002   A       3     0     2
  [ 5] .gnu.version_r    VERNEED          000000000001b0fc  0001b0fc
       0000000000000080  0000000000000000   A       7     4     4
  [ 6] .gnu.hash         GNU_HASH         000000000001b180  0001b180
       0000000000006bb8  0000000000000000   A       3     0     8
  [ 7] .dynstr           STRTAB           0000000000021d38  00021d38
       000000000004be98  0000000000000000   A       0     0     1
  [ 8] .rela.dyn         LOOS+0x2         000000000006dbd0  0006dbd0
       00000000000003d7  0000000000000001   A       3     0     8
  [ 9] .relr.dyn         00000013: <unkn  000000000006dfa8  0006dfa8
       00000000000005b0  0000000000000008   A       0     0     8
  [10] .rela.plt         RELA             000000000006e558  0006e558
       0000000000001da0  0000000000000018  AI       3    21     8
  [11] .eh_frame         PROGBITS         00000000000702f8  000702f8
       000000000003c224  0000000000000000   A       0     0     8
  [12] .rodata           PROGBITS         00000000000ac520  000ac520
       0000000000013141  0000000000000000 AMS       0     0     16
  [13] .eh_frame_hdr     PROGBITS         00000000000bf664  000bf664
       000000000000e6cc  0000000000000000   A       0     0     4
  [14] .text             PROGBITS         0000000000200000  00200000
       0000000000313f6c  0000000000000000  AX       0     0     4
  [15] .plt              PROGBITS         0000000000513f70  00513f70
       00000000000013e0  0000000000000000  AX       0     0     16
  [16] .data.rel.ro      PROGBITS         0000000000600000  00600000
       0000000000015918  0000000000000000  WA       0     0     8
  [17] .fini_array       FINI_ARRAY       0000000000615918  00615918
       0000000000000010  0000000000000000  WA       0     0     8
  [18] .init_array       INIT_ARRAY       0000000000615928  00615928
       0000000000000150  0000000000000000  WA       0     0     8
  [19] .dynamic          DYNAMIC          0000000000615a78  00615a78
       0000000000000280  0000000000000010  WA       7     0     8
  [20] .got              PROGBITS         0000000000615cf8  00615cf8
       0000000000000708  0000000000000000  WA       0     0     8
  [21] .got.plt          PROGBITS         0000000000616400  00616400
       00000000000009f8  0000000000000000  WA       0     0     8
  [22] .bss              NOBITS           0000000000816e00  00616e00
       0000000000007f00  0000000000000000  WA       0     0     16
  [23] .rela.text        RELA             0000000000000000  00616e00
       00000000001fc8c0  0000000000000018   I      38    14     8
  [24] .rela.data.rel.ro RELA             0000000000000000  008136c0
       000000000003b838  0000000000000018   I      38    16     8
  [25] .rela.fini_array  RELA             0000000000000000  0084eef8
       0000000000000030  0000000000000018   I      38    17     8
  [26] .debug_loc        PROGBITS         0000000000000000  0084ef28
       0000000001006314  0000000000000000           0     0     1
  [27] .rela.debug_loc   RELA             0000000000000000  01855240
       00000000004b36d8  0000000000000018   I      38    26     8
  [28] .debug_abbrev     PROGBITS         0000000000000000  01d08918
       0000000000057181  0000000000000000           0     0     1
  [29] .debug_info       PROGBITS         0000000000000000  01d5fa99
       000000000274de3d  0000000000000000           0     0     1
  [30] .rela.debug_info  RELA             0000000000000000  044ad8d8
       000000000447d848  0000000000000018   I      38    29     8
  [31] .debug_ranges     PROGBITS         0000000000000000  0892b120
       0000000000628e30  0000000000000000           0     0     1
  [32] .rela.debug_range RELA             0000000000000000  08f53f50
       0000000000deb940  0000000000000018   I      38    31     8
  [33] .debug_str        PROGBITS         0000000000000000  09d3f890
       0000000000c841af  0000000000000001  MS       0     0     1
  [34] .comment          PROGBITS         0000000000000000  0a9c3a3f
       0000000000000115  0000000000000001  MS       0     0     1
  [35] .debug_line       PROGBITS         0000000000000000  0a9c3b54
       0000000000375b79  0000000000000000           0     0     1
  [36] .rela.debug_line  RELA             0000000000000000  0ad396d0
       000000000002e9f8  0000000000000018   I      38    35     8
  [37] .rela.init_array  RELA             0000000000000000  0ad680c8
       00000000000003f0  0000000000000018   I      38    18     8
  [38] .symtab           SYMTAB           0000000000000000  0ad684b8
       000000000009f660  0000000000000018          40   22968     8
  [39] .shstrtab         STRTAB           0000000000000000  0ae07b18
       00000000000001d9  0000000000000000           0     0     1
  [40] .strtab           STRTAB           0000000000000000  0ae07cf1
       00000000000b9d8d  0000000000000000           0     0     1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  p (processor specific)
CcWeapon commented 2 years ago

@maksfb Please help me

yota9 commented 2 years ago

If I correctly understood your problem you should probably update to the latest LLVM-BOLT version: https://github.com/llvm/llvm-project/commit/6b22c370c82398273d690383f46830dd886e446b

CcWeapon commented 2 years ago

If I correctly understood your problem you should probably update to the latest LLVM-BOLT version: llvm/llvm-project@6b22c37

A perfect answer, thank you.