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Re: [PATCH 2/6] Delegate opcodes to select disassembler in GDB

Hi Yao,

On Tue, 16 May 2017, Yao Qi wrote:

> This patch removes the logic in GDB and calls
> opcodes/disassemble.c:disassembler in default to select disassembler.

 This change causes an assertion failure when trying to disassemble a 
MIPS16 function:

(gdb) disassemble main
Dump of assembler code for function main:
   0x00400209 <+0>:
.../gdb/arch-utils.c:979: internal-error: int default_print_insn(bfd_vma, disassemble_info*): Assertion `info->mach == bfd_get_mach (exec_bfd)' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

This is because `info->mach' is 16 (the `bfd_mach_mips16' aka `mips:16' 
BFD) whereas `bfd_get_mach (exec_bfd)' is 33 (the `bfd_mach_mipsisa32r2' 
aka `mips:isa32r2' BFD).  This is expected for MIPS16 code within a 
program that has been built for the MIPS32r2 ISA; see 
`gdb_print_insn_mips' for the origin.

 So what's the purpose of this assertion?


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