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Luis Machado bd5766ec68 [ARM, thumb] Fix disassembling bug after reloading a symbol file
The speed optimization from commit 5f6cac4085
made GDB skip reloading all symbols when the same symbol file is reloaded.

As a result, ARM targets only read the mapping symbols the first time we
load a symbol file. When reloaded, the speed optimization above will
cause an early return and gdbarch_record_special_symbol won't be called to
save mapping symbol data, which in turn affects disassembling of thumb
instructions.

First load and correct disassemble output:

Dump of assembler code for function main:
    0x0000821c <+0>:     bx      pc
    0x0000821e <+2>:     nop
    0x00008220 <+4>:     mov     r0, #0
    0x00008224 <+8>:     bx      lr

Second load and incorrect disassemble output:

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

This happens because the mapping symbol data is stored in an objfile_key-based
container, and that data isn't preserved across the two symbol loading
operations.

The following patch fixes this by storing the mapping symbol data in a
bfd_key-based container, which doesn't change as long as the bfd is the same.

I've also added a new test to verify the correct disassemble output.

gdb/ChangeLog:

2019-11-01  Luis Machado  <luis.machado@linaro.org>

	PR gdb/25124

	* arm-tdep.c (arm_per_objfile): Rename to ...
	(arm_per_bfd): ... this.
	(arm_objfile_data_key): Rename to ...
	(arm_bfd_data_key): ... this.
	(arm_find_mapping_symbol): Adjust access to new bfd_key-based
	data.
	(arm_record_special_symbol): Likewise.

gdb/testsuite/ChangeLog:

2019-11-01  Luis Machado  <luis.machado@linaro.org>

	PR gdb/25124

	* gdb.arch/pr25124.S: New file.
	* gdb.arch/pr25124.exp: New file.

Change-Id: I22c3e6ebe9bfedad66d56fe9656994fa1761c485
2019-11-01 10:11:17 -03:00
bfd Automatic date update in version.in 2019-11-01 00:00:27 +00:00
binutils Update email address for Palmer Dabbelt. 2019-10-30 10:52:15 +00:00
config
contrib
cpu
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gas i386; Add .code16gcc fldenv tests 2019-10-31 10:42:04 -07:00
gdb [ARM, thumb] Fix disassembling bug after reloading a symbol file 2019-11-01 10:11:17 -03:00
gnulib
gold
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include Fix the size of the dos_message field in the internal_extra_pe_filehdr structure on hosts where sizeof(long) == 8. 2019-10-29 08:02:34 +00:00
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opcodes Modify the ARNM assembler to accept the omission of the immediate argument for the writeback form of the LDRAA and LDRAB mnemonics 2019-10-30 13:23:35 +00:00
readline Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
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