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[aarch64] Handle unknown instruction encoding 

We see the following build error:

 gdb/aarch64-tdep.c: In function 'aarch64_process_record':
 gdb/aarch64-tdep.c:2823:17: error: 'record_buf[0]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
                 memcpy(&REGS[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \
                 ^
 gdb/aarch64-tdep.c:3529:12: note: 'record_buf[0]' was declared here
   uint32_t record_buf[2];

since record_buf[0] isn't initialized in some paths in which
instruction encodings doesn't exist in current ARMv8 reference manual.
This patch is to let the function return AARCH64_RECORD_UNKNOWN for
these paths.

gdb:

2015-05-27  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_record_data_proc_simd_fp): Return
	AARCH64_RECORD_UNKNOWN for unknown instruction encoding.
This commit is contained in:
Yao Qi 2015-05-27 11:08:40 +01:00
parent 5d98d3cd86
commit f62fce356b
2 changed files with 12 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2015-05-27 Yao Qi <yao.qi@linaro.org>
* aarch64-tdep.c (aarch64_record_data_proc_simd_fp): Return
AARCH64_RECORD_UNKNOWN for unknown instruction encoding.
2015-05-27 Yao Qi <yao.qi@linaro.org>
* aarch64-tdep.c (aarch64_record_branch_except_sys): Split lines

8
gdb/aarch64-tdep.c
View File

@ -3592,7 +3592,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r)
record_buf[0] = AARCH64_CPSR_REGNUM;
}
/* Floating point - integer conversions instructions. */
if (insn_bits12_15 == 0x00)
else if (insn_bits12_15 == 0x00)
{
/* Convert float to integer instruction. */
if (!(opcode >> 1) || ((opcode >> 1) == 0x02 && !rmode))
@ -3621,8 +3621,14 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r)
else
record_buf[0] = reg_rd + AARCH64_V0_REGNUM;
}
else
return AARCH64_RECORD_UNKNOWN;
}
else
return AARCH64_RECORD_UNKNOWN;
}
else
return AARCH64_RECORD_UNKNOWN;
}
else if ((insn_bits28_31 & 0x09) == 0x00 && insn_bits24_27 == 0x0e)
{