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binutils-gdb/gdb/features
Luis Machado ba60b96371 [aarch64] Add TPIDR2 register support for Linux
With the AArch64 Scalable Matrix Extension we have a new TPIDR2 register, and
it will be added to the existing NT_ARM_TLS register set. Kernel patches are
being reviewed here:

https://lore.kernel.org/linux-arm-kernel/20220818170111.351889-1-broonie@kernel.org/

From GDB's perspective, we handle it in a similar way to the existing TPIDR
register. But we need to consider cases of systems that only have TPIDR and
systems that have both TPIDR and TPIDR2.

With that in mind, the following patch adds the required code to support
TPIDR2 and turns the org.gnu.gdb.aarch64.tls feature into a
dynamically-generated target description as opposed to a static target
description containing only TPIDR.

That means we can remove the gdb/features/aarch64-tls.xml file and replace the
existing gdb/features/aarch64-tls.c auto-generated file with a new file that
dynamically generates the target description containing either TPIDR alone or
TPIDR and TPIDR2.

In the future, when *BSD's start to support this register, they can just
enable it as is being done for the AArch64 Linux target.

The core file read/write code has been updated to support TPIDR2 as well.

On GDBserver's side, there is a small change to the find_regno function to
expose a non-throwing version of it.

It always seemed strange to me how find_regno causes the whole operation to
abort if it doesn't find a particular register name. The patch moves code
from find_regno into find_regno_no_throw and makes find_regno call
find_regno_no_throw instead.

This allows us to do register name lookups to find a particular register
number without risking erroring out if nothing is found.

The patch also adjusts the feature detection code for aarch64-fbsd, since
the infrastructure is shared amongst all aarch64 targets. I haven't added
code to support TPIDR2 in aarch64-fbsd though, as I'm not sure when/if
that will happen.
2022-12-09 13:41:15 +00:00
..
arc
arm
i386
loongarch
riscv
rs6000
sparc
aarch64-core.c
aarch64-core.xml
aarch64-fpu.c
aarch64-fpu.xml
aarch64-mte.c
aarch64-mte.xml
aarch64-pauth.c
aarch64-pauth.xml
aarch64-sve.c
aarch64-tls.c
btrace-conf.dtd
btrace.dtd
cskyv2-linux.c
cskyv2-linux.xml
feature_to_c.sh
gdb-target.dtd
gdbserver-regs.xsl
library-list-aix.dtd
library-list-svr4.dtd
library-list.dtd
m68k-core.xml
Makefile
microblaze-core.xml
microblaze-stack-protect.xml
microblaze-with-stack-protect.c
microblaze-with-stack-protect.xml
microblaze.c
microblaze.xml
mips64-cp0.xml
mips64-cpu.xml
mips64-dsp-linux.c
mips64-dsp-linux.xml
mips64-dsp.xml
mips64-fpu.xml
mips64-linux.c
mips64-linux.xml
mips-cp0.xml
mips-cpu.xml
mips-dsp-linux.c
mips-dsp-linux.xml
mips-dsp.xml
mips-fpu.xml
mips-linux.c
mips-linux.xml
nds32-core.xml
nds32-fpu.xml
nds32-system.xml
nds32.c
nds32.xml
nios2-cpu.xml
nios2-linux.xml
nios2.c
nios2.xml
number-regs.xsl
or1k-core.xml
or1k-linux.c
or1k-linux.xml
or1k.c
or1k.xml
osdata.dtd
rx.c
rx.xml
s390-acr.xml
s390-core32.xml
s390-core64.xml
s390-fpr.xml
s390-gs-linux64.c
s390-gs-linux64.xml
s390-gs.xml
s390-gsbc.xml
s390-linux32.c
s390-linux32.xml
s390-linux32v1.c
s390-linux32v1.xml
s390-linux32v2.c
s390-linux32v2.xml
s390-linux64.c
s390-linux64.xml
s390-linux64v1.c
s390-linux64v1.xml
s390-linux64v2.c
s390-linux64v2.xml
s390-tdb.xml
s390-te-linux64.c
s390-te-linux64.xml
s390-tevx-linux64.c
s390-tevx-linux64.xml
s390-vx-linux64.c
s390-vx-linux64.xml
s390-vx.xml
s390x-core64.xml
s390x-gs-linux64.c
s390x-gs-linux64.xml
s390x-linux64.c
s390x-linux64.xml
s390x-linux64v1.c
s390x-linux64v1.xml
s390x-linux64v2.c
s390x-linux64v2.xml
s390x-te-linux64.c
s390x-te-linux64.xml
s390x-tevx-linux64.c
s390x-tevx-linux64.xml
s390x-vx-linux64.c
s390x-vx-linux64.xml
sort-regs.xsl
threads.dtd
tic6x-c6xp.c
tic6x-c6xp.xml
tic6x-c62x-linux.xml
tic6x-c64x-linux.xml
tic6x-c64xp-linux.xml
tic6x-core.c
tic6x-core.xml
tic6x-gp.c
tic6x-gp.xml
traceframe-info.dtd
xinclude.dtd
z80-cpu.xml
z80.c
z80.xml