Re: 答复: GDB: ARM: regression: thumb-bx-pc.exp

[Luis Machado]

Thanks. I've reported this on bugzilla for investigation:

https://sourceware.org/bugzilla/show_bug.cgi?id=25124


On 10/20/19 11:58 PM, 脮脭驴隆脤脦 wrote:
> Hi,
> When I was doing a regression test, I found a problem from thumb-bx-pc.exp.  I load a symbol table by file command, then I use 隆庐disassemble main隆炉 command and the result is correct.
> When I use file command again to load the same symbol table, the result of 隆庐disassemble main隆炉 is wrong. Here's the log.
> 
> GNU gdb (GDB) 8.2
> Copyright (C) 2018 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later<http://gnu.org/licenses/gpl.html>
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> Type "show copying" and "show warranty" for details.
> This GDB was configured as "--host=x86_64-pc-linux-gnu --target=arm-elf-eabi".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
>       <http://www.gnu.org/software/gdb/documentation/>.
> 
> For help, type "help".
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> (gdb) file "/home/juntao_zhao/debugger/test/8_2_repo_sdlc/run/outputs/gdb.arch/thumb-bx-pc/thumb-bx-pc"
> Reading symbols from /home/juntao_zhao/debugger/test/8_2_repo_sdlc/run/outputs/gdb.arch/thumb-bx-pc/thumb-bx-pc...done.
> (gdb) disassemble main
> Dump of assembler code for function main:
>      0x0000821c <+0>:     bx      pc
>      0x0000821e <+2>:     nop
>      0x00008220 <+4>:     mov     r0, #0
>      0x00008224 <+8>:     bx      lr
> End of assembler dump.
> (gdb) file "/home/juntao_zhao/debugger/test/8_2_repo_sdlc/run/outputs/gdb.arch/thumb-bx-pc/thumb-bx-pc"
> Load new symbol table from "/home/juntao_zhao/debugger/test/8_2_repo_sdlc/run/outputs/gdb.arch/thumb-bx-pc/thumb-bx-pc"? (y or n) y
> Reading symbols from /home/juntao_zhao/debugger/test/8_2_repo_sdlc/run/outputs/gdb.arch/thumb-bx-pc/thumb-bx-pc...done.
> (gdb) disassemble  main
> Dump of assembler code for function main:
>      0x0000821c <+0>:     bx      pc
>      0x0000821e <+2>:     nop
>      0x00008220 <+4>:     movs    r0, r0
>      0x00008222 <+6>:     b.n     0x8966
>      0x00008224 <+8>:     vrhadd.u16      d14, d14, d31
> End of assembler dump.
> 
> I'm surprised and I don't know why. Could you give me some advice?