gdb爲什麼認爲我的x86-64程序是i386？

我試圖調試一個64位程序，但gdb似乎認爲它有一個i386架構。gdb爲什麼認爲我的x86-64程序是i386？

# file /usr/local/bin/foo 
/usr/local/bin/foo: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.4.0, not stripped 


# gdb --args foo bar 
GNU gdb (GDB) 7.3.1 
Copyright (C) 2011 Free Software Foundation, Inc. 
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 
This is free software: you are free to change and redistribute it. 
There is NO WARRANTY, to the extent permitted by law. Type "show copying" 
and "show warranty" for details. 
This GDB was configured as "x86_64-pc-linux-gnu". 
For bug reporting instructions, please see: 
<http://www.gnu.org/software/gdb/bugs/>... 
Reading symbols from /usr/local/bin/foo...done. 
(gdb) set debug arch 1 
(gdb) show debug arch 
Architecture debugging is 1. 
(gdb) info target 
Symbols from "/usr/local/bin/foo". 
Local exec file: 
gdbarch_find_by_info: info.bfd_arch_info i386:x86-64 
gdbarch_find_by_info: info.byte_order 1 (little) 
gdbarch_find_by_info: info.osabi 5 (GNU/Linux) 
gdbarch_find_by_info: info.abfd 0xaf4a90 
gdbarch_find_by_info: info.tdep_info 0x0 
gdbarch_find_by_info: Previous architecture 0xb05790 (i386:x86-64) selected 
    `/usr/local/bin/foo', file type elf64-x86-64. 
    Entry point: 0x419730 
    0x00000000004001c8 - 0x00000000004001e4 is .interp 
    0x00000000004001e4 - 0x0000000000400204 is .note.ABI-tag 
    0x0000000000400208 - 0x0000000000402560 is .hash 
    0x0000000000402560 - 0x0000000000409898 is .dynsym 
    0x0000000000409898 - 0x0000000000411188 is .dynstr 
    0x0000000000411188 - 0x0000000000411b22 is .gnu.version 
    0x0000000000411b28 - 0x0000000000411b88 is .gnu.version_r 
    0x0000000000411b88 - 0x00000000004181a0 is .rela.dyn 
    0x00000000004181a0 - 0x0000000000418e78 is .rela.plt 
    0x0000000000418e78 - 0x0000000000418e90 is .init 
    0x0000000000418e90 - 0x0000000000419730 is .plt 
    0x0000000000419730 - 0x00000000004ede38 is .text 
    0x00000000004ede38 - 0x00000000004ede46 is .fini 
    0x00000000004ede48 - 0x00000000004ede4c is .eh_frame 
    0x00000000006ee000 - 0x00000000006ee010 is .ctors 
    0x00000000006ee010 - 0x00000000006ee020 is .dtors 
    0x00000000006ee020 - 0x00000000006ee028 is .jcr 
    0x00000000006ee028 - 0x00000000006ee1f8 is .dynamic 
    0x00000000006ee1f8 - 0x00000000006f07f0 is .got 
    0x00000000006f07f0 - 0x00000000006f0c50 is .got.plt 
    0x00000000006f0c50 - 0x0000000000736c70 is .data 
    0x0000000000736c70 - 0x000000000073b420 is .bss 
(gdb) start 
Temporary breakpoint 1 at 0x419e70: file foo.lpr, line 69. 
Starting program: /usr/local/bin/foo bar 
warning: Selected architecture i386:x86-64 is not compatible with reported target architecture i386 
gdbarch_find_by_info: info.bfd_arch_info i386:x86-64 
gdbarch_find_by_info: info.byte_order 1 (little) 
gdbarch_find_by_info: info.osabi 5 (GNU/Linux) 
gdbarch_find_by_info: info.abfd 0xaf4a90 
gdbarch_find_by_info: info.tdep_info 0x0 
gdbarch_find_by_info: Target rejected architecture 
gdbarch_update_p: Architecture not found 
warning: Architecture rejected target-supplied description 
gdbarch_find_by_info: info.bfd_arch_info i386:x86-64 
gdbarch_find_by_info: info.byte_order 1 (little) 
gdbarch_find_by_info: info.osabi 5 (GNU/Linux) 
gdbarch_find_by_info: info.abfd 0xd6ce90 
gdbarch_find_by_info: info.tdep_info 0x0 
gdbarch_find_by_info: Previous architecture 0xb05790 (i386:x86-64) selected 
Error in re-setting breakpoint 1: Cannot access memory at address 0x419e60 
Error in re-setting breakpoint 1: Cannot access memory at address 0x419e60 
process 5299 is executing new program: /usr/local/bin/foo 
warning: Selected architecture i386:x86-64 is not compatible with reported target architecture i386 
gdbarch_find_by_info: info.bfd_arch_info i386:x86-64 
gdbarch_find_by_info: info.byte_order 1 (little) 
gdbarch_find_by_info: info.osabi 5 (GNU/Linux) 
gdbarch_find_by_info: info.abfd 0xb21790 
gdbarch_find_by_info: info.tdep_info 0x0 
gdbarch_find_by_info: Target rejected architecture 
Architecture of file not recognized.

注意警告：

warning: Selected architecture i386:x86-64 is not compatible with reported target architecture i386

然後：

gdbarch_find_by_info: Target rejected architecture 
gdbarch_update_p: Architecture not found 
warning: Architecture rejected target-supplied description

在gdb中，如果我輸入 '集架構'，打標籤，我看到以下內容：

(gdb) set architecture 
auto    i386:intel   i386:x64-32:intel i386:x86-64:intel 
i386    i386:x64-32  i386:x86-64  i8086

我的問題是：爲什麼gdb thi nk我的文件有一個i386體系結構，即使它顯然是一個x86-64二進制文件，我該怎麼辦才能修復它？

我的程序是使用FreePascal版本2.6.0編譯的。

更新：我沒有在我的Ubuntu 12.04機器上（使用3.2.0-31內核）使用相同的gdb二進制文件和相同的freepascal二進制文件得到任何警告。我試圖調試的服務器正在運行2.6.34.10-24內核。在內核或服務器上可能會對gdb產生影響嗎？

來源

2012-09-27 Matt Hulse

這個二進制文件是如何編譯的？還是編譯後手動編輯？ –

@DavidSchwartz我剛剛更新了這個問題。它使用FreePascal 2.6.0編譯。 –

我投票結束，因爲我相信這個問題是由於我運行的平臺。它基於Linux，但它不是一個標準的發行版，因此我不認爲這個問題會讓其他人受益。 –

你的問題，從這裏開始：

gdbarch_find_by_info：目標拒絕架構

這意味着GDB該目標相關的代碼不喜歡一些關於i386:x86-64架構。不幸的是，沒有簡單的方法來告訴它不喜歡什麼 - 你必須調試GDB本身才能找到它。

你能在GDB失敗的機器上調試其他二進制文件（例如/bin/date）嗎？

來源

2012-09-28 00:25:11

是的，我可以調試/斌/日期，但它是在32位有問題的系統。 32位應用程序工作正常。我在調試GDB本身時看到相同的消息。 –

gdb爲什麼認爲我的x86-64程序是i386？

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