This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
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.
Introduce a new qXfer:libraries-svr4:read annex key/value pair
lmid=<namespace identifier>
to be used together with start and prev to provide the namespace of start
and prev to gdbserver.
Unknown key/value pairs are ignored by gdbserver so no new supports check
is needed.
Introduce a new library-list-svr4 library attribute
lmid
to provide the namespace of a library entry to GDB.
This implementation uses the address of a namespace's r_debug object as
namespace identifier.
This should have incremented the minor version but since unknown XML
attributes are ignored, anyway, and since changing the version results in
a warning from GDB, the version is left at 1.0.
I noticed some missing flags/fields from FPSR and FPCR registers in
both the FPU and SVE target descriptions.
This patch adds those and makes the SVE versions of FPSR and FPCR
use the proper flags/bitfields types.
Building on the previous commit, this commit extends the register_name
selftest to check for duplicate register names.
If two registers in the cooked register set (real + pseudo registers)
have the same name, then this will show up as duplicate registers in
the 'info all-registers' output, but the user will only be able to
interact with one copy of the register.
In this commit I extend the selftest that I added in the previous
commit to check for duplicate register names, I didn't include this
functionality in the previous commit because one architecture needed
fixing, and I wanted to keep those fixes separate from the fixes in
the previous commit.
The problematic architecture(s) are powerpc:750 and powerpc:604. In
both of these cases the 'dabr' register appears twice, there's a
definition of dabr in power-oea.xml which is included into both
powerpc-604.xml and powerpc-750.xml. Both of these later two xml
files also define the dabr register.
I'm hopeful that this change shouldn't break anything, but I don't
have the ability to actually test this change, however:
On the gdbserver side, neither powerpc-604.xml nor powerpc-750.xml are
mentioned in gdbserver/configure.srv, which I think means that
gdbserver will never use these descriptions, and,
Within GDB the problematic descriptions are held in the variables
tdesc_powerpc_604 and tdesc_powerpc_750, which are only mentioned in
the variants array in rs6000-tdep.c, this is used when looking up a
description based on the architecture.
For a native Linux target however, this will not be used as
ppc_linux_nat_target::read_description exists, which calls
ppc_linux_match_description, which I don't believe can return either
of the problematic descriptions.
This leaves the other native targets, FreeBSD, AIX, etc. These don't
appear to override the ::read_description method, so will potentially
return the problematic descriptions, but, in each case I think the
::fetch_registers and ::store_registers methods will ignore the dabr
register, which will leave the register as <unavailable>.
So, my proposed solution is to just remove the duplicate register from
each of powerpc-604.xml and powerpc-750.xml, then regenerate the
corresponding C++ source file. With this change made, the selftest
now passes for all architectures.
This patch changes various global target_desc declarations to const, thereby
correcting a prominent source of ODR violations in PowerPC-related target code.
The majority of files/changes are mechanical const-ifications accomplished by
regenerating the C files in features/.
This also required manually updating mips-linux-tdep.h, s390-linux-tdep.h,
nios2-tdep.h, s390-tdep.h, arch/ppc-linux-tdesc.h, arch/ppc-linux-common.c,
and rs6000-tdep.c.
Patch tested against the sourceware trybot, and fully regression tested against
our (Red Hat's) internal test infrastructure on Rawhide aarch64, s390x, x86_64,
and powerpcle.
With this patch, I can finally enable LTO in our GDB package builds. [Tested
with a rawhide scratch build containing this patch.]
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=22395
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24835
This patch adds some missing .xml files to features/Makefile so that when the
directory's C files are regenerated, all files are appropriately remade.
This has demonstrated that there have been several "misses" in regenerating
files in this directory. Namely, arm-secext.c and sparc{32,64}-solaris.c. For
the former case, there was what essentially amounts to a typo regarding the
create feature function's name. In the later case, this file has missed at least
one important update in July, 2020, when allocate_target_description was
changed to return a unique pointer.
Those corrections are included.
Add new files:
gdb/arch/csky.c
gdb/arch/csky.h
gdb/features/cskyv2-linux.c
gdbserver/linux-csky-low.cc
1. In gdb/arch/csky.c file, add function "csky_create_target_description()"
for csky_target::low_arch_setup(). later, it can be used for csky native gdb.
2. In gdb/features/cskyv2-linux.c file, create target_tdesc for csky, include
gprs, pc, hi, lo, float, vector and float control registers.
3. In gdbserver/linux-csky-low.cc file, using PTRACE_GET/SET_RGESET to
get/set registers. The main data structures in asm/ptrace.h are:
struct pt_regs {
unsigned long tls;
unsigned long lr;
unsigned long pc;
unsigned long sr;
unsigned long usp;
/*
* a0, a1, a2, a3:
* r0, r1, r2, r3
*/
unsigned long orig_a0;
unsigned long a0;
unsigned long a1;
unsigned long a2;
unsigned long a3;
/*
* r4 ~ r13
*/
unsigned long regs[10];
/* r16 ~ r30 */
unsigned long exregs[15];
unsigned long rhi;
unsigned long rlo;
unsigned long dcsr;
};
struct user_fp {
unsigned long vr[96];
unsigned long fcr;
unsigned long fesr;
unsigned long fid;
unsigned long reserved;
};
First, some background on the RISC-V registers fflags, frm, and fcsr.
These three registers all relate to the floating-point status and
control mechanism on RISC-V. The fcsr is the floatint-point control
status register, and consists of two parts, the flags (bits 0 to 4)
and the rounding-mode (bits 5 to 7).
The fcsr register is just one of many control/status registers (or
CSRs) available on RISC-V. The fflags and frm registers are also
CSRs. These CSRs are aliases for the relevant parts of the fcsr
register. So fflags is an alias for bits 0 to 4 of fcsr, and frm is
an alias for bits 5 to 7 of fcsr.
This means that a user can change the floating-point rounding mode
either, by writing a complete new value into fcsr, or by writing just
the rounding mode into frm.
How this impacts on GDB is like this: a target description could,
legitimately include all three registers, fcsr, fflags, and frm. The
QEMU target currently does this, and this makes sense. The target is
emulating the complete system, and has all three CSRs available, so
why not tell GDB about this.
In contrast, the RISC-V native Linux target only has access to the
fcsr. This is because the ptrace data structure that the kernel uses
for reading and writing floating point state only contains a copy of
the fcsr, after all, this one field really contains both the fflags
and frm fields, so why carry around duplicate data.
So, we might expect that the target description for the RISC-V native
Linux GDB would only contain the fcsr register. Unfortunately, this
is not the case. The RISC-V native Linux target uses GDB's builtin
target descriptions by calling riscv_lookup_target_description, this
will then add an fpu feature from gdb/features/riscv, either
32bit-fpu.xml or 64bit-fpu.xml. The problem, is that these features
include an entry for fcsr, fflags, and frm. This means that GDB
expects the target to handle reading and writing these registers. And
the RISC-V native Linux target currently doesn't.
In riscv_linux_nat_target::store_registers and
riscv_linux_nat_target::fetch_registers only the fcsr register is
handled, this means that, for RISC-V native Linux, the fflags and frm
registers always show up as <unavailable> - they are present in the
target description, but the target doesn't know how to access the
registers.
A final complication relating to these floating pointer CSRs is which
target description feature the registers appear in.
These registers are CSRs, so it would seem sensible that these
registers should appear in the CSR target description feature.
However, when I first added RISC-V target description support, I was
using a RISC-V simulator that didn't support any CSRs other than the
floating point related ones. This simulator bundled all the float
related CSRs into the fpu target feature. This didn't feel completely
unreasonable to me, and so I had GDB check for these registers in
either target feature.
In this commit I make some changes relating to how GDB handles the
three floating point CSR:
1. Remove fflags and frm from 32bit-fpu.xml and 64bit-fpu.xml. This
means that the default RISC-V target description (which RISC-V native
FreeBSD), and the target descriptions created for RISC-V native Linux,
will not include these registers. There's nothing stopping some other
target (e.g. QEMU) from continuing to include all three of these CSRs,
the code in riscv-tdep.c continues to check for all three of these
registers, and will handle them correctly if they are present.
2. If a target supplied fcsr, but does not supply fflags and/or frm,
then RISC-V GDB will now create two pseudo registers in order to
emulate the two missing CSRs. These new pseudo-registers do the
obvious thing of just reading and writing the fcsr register.
3. With the new pseudo-registers we can no longer make use of the GDB
register numbers RISCV_CSR_FFLAGS_REGNUM and RISCV_CSR_FRM_REGNUM.
These will be the numbers used if the target supplies the registers in
its target description, but, if GDB falls back to using
pseudo-registers, then new, unique numbers will be used. To handle
this I've added riscv_gdbarch_tdep::fflags_regnum and
riscv_gdbarch_tdep::frm_regnum, I've then updated the RISC-V code to
compare against these fields.
When adding the pseudo-register support, it is important that the
pseudo-register numbers are calculated after the call to
tdesc_use_registers. This is because we don't know the total number
of physical registers until after this call, and the psuedo-register
numbers must follow on from the real (target supplied) registers.
I've updated some tests to include more testing of the fflags and frm
registers, as well as adding a new test.
After this commit:
commit 7b7c365c5c
Date: Wed Sep 15 10:10:46 2021 +0200
[bfd] Ensure unique printable names for bfd archs
The printable name field of the default nds32 bfd_arch_info changed
from 'n1h' to 'n1'. As a consequence the generated feature file
within GDB should have been recreated. Recreate it now.
The current implementation of the fcc register is referenced to the
user_fp_state structure of the kernel uapi [1].
struct user_fp_state {
uint64_t fpr[32];
uint64_t fcc;
uint32_t fcsr;
};
But it is mistakenly defined as a 64-bit fputype register, resulting
in a confusing output of "info register".
(gdb) info register
...
fcc {f = 0x0, d = 0x0} {f = 0, d = 0}
...
According to "Condition Flag Register" in "LoongArch Reference Manual"
[2], there are 8 condition flag registers of size 1. Use 8 registers of
uint8 to make it easier for users to view the fcc register groups.
(gdb) info register
...
fcc0 0x1 1
fcc1 0x0 0
fcc2 0x0 0
fcc3 0x0 0
fcc4 0x0 0
fcc5 0x0 0
fcc6 0x0 0
fcc7 0x0 0
...
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/loongarch/include/uapi/asm/ptrace.h
[2] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_condition_flag_register
Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
The basic support for LoongArch has been merged into the upstream Linux
kernel since 5.19-rc1 on June 5, 2022. This commit adds orig_a0 which
is added into struct user_pt_regs [1] to match the upstream kernel, and
then the upstream GDB will work with the upstream kernel.
Note that orig_a0 was added into struct user_pt_regs in the development
cycle for merging LoongArch port into the upstream Linux kernel, so
earlier kernels (notably, the product kernel with version 4.19 used in
distros like UOS and Loongnix) don't have it. Inspect
arch/loongarch/include/uapi/asm/ptrace.h in the kernel tree to make sure.
To build upstream GDB for a kernel lacking orig_a0, it's necessary to
revert this commit locally.
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/loongarch/include/uapi/asm/ptrace.h#n24
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Armv8-M architecture with Security extension features four stack pointers
to handle Secure and Non-secure modes.
This patch adds support to switch between them as needed during
unwinding, and replaces all updates of cache->prev_sp with calls to
arm_cache_set_prev_sp.
Signed-off-by: Torbjörn Svensson <torbjorn.svensson@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@foss.st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@arm.com>
This patch removes the hardcoded access to PSP in
arm_m_exception_cache() and relies on the definition with the XML
descriptions.
Signed-off-by: Christophe Lyon <christophe.lyon@foss.st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@arm.com>
1. Since 32bit-pkeys.xml and 64bit-pkeys.xml are identical, consolidate
them into a single keys.xml.
2. Enable PKU for x32 to fix:
$ gdbserver :123456 x32-program
...
.../gdbserver/regcache.cc:255: A problem internal to GDBserver has been detected
.
Unknown register pkru requested
on Tiger Lake.
This commit adds Makefile, configure and NEWS for LoongArch.
Signed-off-by: Zhensong Liu <liuzhensong@loongson.cn>
Signed-off-by: Qing zhang <zhangqing@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
This commit adds initial target description support for LoongArch.
Signed-off-by: Zhensong Liu <liuzhensong@loongson.cn>
Signed-off-by: Qing zhang <zhangqing@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.
For the avoidance of doubt, all changes in this commits were
performed by the script.
Augment the register description XML to expose the BTI BTYPE field contained
in the CPSR register. It will be displayed like so:
cpsr 0x60001000 [ EL=0 BTYPE=0 SSBS C Z ]
This patch adds gdbserver support for OpenRISC. This has been used for
debugging the glibc port that in being worked on here:
https://github.com/openrisc/or1k-glibc/tree/or1k-port-2
Hence the comment about registers definitions being inline with glibc.
This adds support for the half datatype, FP16, to the AVX512 register printing.
gdb/ChangeLog:
2020-07-21 Felix Willgerodt <Felix.Willgerodt@intel.com>
* i386-tdep.c (i386_zmm_type) <v32_half>: New field.
(i386_ymm_type) <v16_half>: New field.
(i386_gdbarch_init): Add set_gdbarch_half_format.
* features/i386/64bit-avx512.xml: Add half type.
* features/i386/64bit-avx512.c: Regenerated.
* features/i386/64bit-sse.xml: Add half type.
* features/i386/64bit-sse.c: Regenerated.
gdb/testsuite/ChangeLog:
2021-07-21 Felix Willgerodt <Felix.Willgerodt@intel.com>
* gdb.arch/x86-avx512fp16.c: New file.
* gdb.arch/x86-avx512fp16.exp: New file.
* lib/gdb.exp (skip_avx512fp16_tests): New function.
Values of type bfloat16 can also be used on 32-bit targets, which was missed
in the original enablement. This also adjusts the testcase to pass with
"unix/-m32", where only the lower 8 AVX registers are available.
gdb/ChangeLog:
2021-07-21 Felix Willgerodt <Felix.Willgerodt@intel.com>
* features/i386/32bit-sse.xml: Add bfloat16 type.
* features/i386/32bit-sse.c: Regenerated.
gdb/testsuite/ChangeLog:
2021-07-21 Felix Willgerodt <Felix.Willgerodt@intel.com>
* gdb.arch/x86-avx512bf16.exp: Only use x/z/ymm 0-7.
Clean up some things I noticed:
- we generate a regformats/microblaze-with-stack-protect.dat file. I
don't think this is used. It could be used by a GDBserver built for
Microblaze, but GDBserver isn't ported to Microblaze. So I don't
think that's used at all. Remove the entry in features/Makefile and
the file itself.
- There are a bunch of *-expedite values in features/Makefile for
architectures for which we don't generate dat files. AFAIK, these
*-expedite values are only used when generating dat files. Remove
those that are not necessary.
- 32bit-segments.xml is not listed in the Makfile, but it's used. This
means that it wouldn't get re-generated if we were to change how C
files are generated from the XML. It looks like it was simply
forgotten, add it.
Change-Id: I112d00db317102270e1df924473c37122ccb6c3a
This patch adds a target description and feature "mte" for aarch64.
It includes one new register, tag_ctl, that can be used to configure the
tag generation rules and sync/async modes. It is 64-bit in size.
The patch also adjusts the code that creates the target descriptions at
runtime based on CPU feature checks.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::read_description): Take MTE flag into
account.
Slight refactor to hwcap flag checking.
* aarch64-linux-tdep.c
(aarch64_linux_core_read_description): Likewise.
* aarch64-tdep.c (tdesc_aarch64_list): Add one more dimension for
MTE.
(aarch64_read_description): Add mte_p parameter and update to use it.
Update the documentation.
(aarch64_gdbarch_init): Update call to aarch64_read_description.
* aarch64-tdep.h (aarch64_read_description): Add mte_p parameter.
* arch/aarch64.c: Include ../features/aarch64-mte.c.
(aarch64_create_target_description): Add mte_p parameter and update
the code to use it.
* arch/aarch64.h (aarch64_create_target_description): Add mte_p
parameter.
* features/Makefile (FEATURE_XMLFILES): Add aarch64-mte.xml.
* features/aarch64-mte.c: New file, generated.
* features/aarch64-mte.xml: New file.
gdbserver/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* linux-aarch64-ipa.cc (get_ipa_tdesc): Update call to
aarch64_linux_read_description.
(initialize_low_tracepoint): Likewise.
* linux-aarch64-low.cc (aarch64_target::low_arch_setup): Take MTE flag
into account.
* linux-aarch64-tdesc.cc (tdesc_aarch64_list): Add one more dimension
for MTE.
(aarch64_linux_read_description): Add mte_p parameter and update to
use it.
* linux-aarch64-tdesc.h (aarch64_linux_read_description): Add mte_p
parameter.
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
This commit started as adding rv32e support to gdb. The rv32e
architecture is a cut-down rv32i, it only has 16 x-registers compared
to the usual 32, and an rv32e target should not have any floating
point registers.
In order to add this I needed to adjust the target description
validation checks that are performed from riscv_gdbarch_init, and I
finally got fed up with the current scheme of doing these checks and
rewrote this code.
Unfortunately the rv32e changes are currently mixed in with the
rewrite of the validation scheme. I could split these apart if anyone
is really interested in seeing these two ideas as separate patches.
The main idea behind this change is that where previously I tried to
have a purely data driven approach, a set of tables one for each
expected feature, and then a single generic function that would
validate a feature given a table, I have created a new class for each
feature. Each class has its own check member function which allows
the logic for how to check each feature to be different. I think the
new scheme is much easier to follow.
There are some other changes that I made to the validation code as
part of this commit.
I've relaxed some of the checks related to the floating point CSRs.
Previously the 3 CSRs fflags, frm, and fcsr all had to be present in
either the fpu feature or the csr feature. This requirement is now
relaxed, if the CSRs are not present then gdb will not reject the
target description. My thinking here is that there's no gdb
functionality that specifically requires these registers, and so, if a
target offers a description without these registers nothing else in
gdb should stop working.
And as part of the rv32e support targets now only have to provide the
first 16 x-registers and $pc. The second half of the x-registers (x16
-> x31) are now optional.
gdb/ChangeLog:
* arch/riscv.c: Include 'rv32e-xregs.c'.
(riscv_create_target_description): Update to handle rv32e.
* arch/riscv.h (struct riscv_gdbarch_features) <embedded>: New
member variable.
<operator==>: Update to account for new field.
<hash>: Likewise.
* features/Makefile (FEATURE_XMLFILES): Add riscv/rv32e-xregs.xml.
* features/riscv/rv32e-xregs.c: Generated.
* features/riscv/rv32e-xregs.xml: New file.
* riscv-tdep.c (riscv_debug_breakpoints): Move from later in the
file.
(riscv_debug_infcall): Likewise.
(riscv_debug_unwinder): Likewise.
(riscv_debug_gdbarch): Likewise.
(enum riscv_register_required_status): Delete.
(struct riscv_register_feature): Add constructor, delete default
constructor, copy, and assign constructors.
(struct riscv_register_feature::register_info) <required>: Delete.
<check>: Update comment and arguments.
(struct riscv_register_feature) <name>: Change to member function.
<prefer_first_name>: Delete.
<tdesc_feature>: New member function.
<registers>: Rename to...
<m_registers>: ...this.
<m_feature_name>: New member variable.
(riscv_register_feature::register_info::check): Update arguments.
(riscv_xreg_feature): Rewrite as class, create a single static
instance of the class.
(riscv_freg_feature): Likewise.
(riscv_virtual_feature): Likewise.
(riscv_csr_feature): Likewise.
(riscv_create_csr_aliases): Has become a member function inside
riscv_csr_feature class.
(riscv_abi_embedded): New function definition.
(riscv_register_name): Adjust to use new feature objects.
(struct riscv_call_info) <riscv_call_info>: Check for rv32e abi,
and adjust available argument registers.
(riscv_features_from_gdbarch_info): Check for EF_RISCV_RVE flag.
(riscv_check_tdesc_feature): Delete.
(riscv_tdesc_unknown_reg): Adjust to use new feature objects.
(riscv_gdbarch_init): Delete target description checking code, and
instead call to the new feature objects to perform the checks.
Reorder handling of no abi information case, allows small code
simplification.
(_initialize_riscv_tdep): Remove call, this is now done in the
riscv_csr_feature constructor.
* riscv-tdep.h (riscv_abi_embedded): Declare.
This patch updates FPCR (Floating-point Control Register) and FPSR
(Floating-point Status Register) named fields in AArch64. For detailed
description of named register FPCR and FPSR bit fields see [1] and [2].
Please not that bit fields FIZ, AH and NEP (bits 0, 1 and 2 respectively) in
FPCR are defined starting from Armv8.7 architecture.
[1]: https://developer.arm.com/docs/ddi0595/i/aarch64-system-registers/fpcr
[2]: https://developer.arm.com/docs/ddi0595/i/aarch64-system-registers/fpsr
Example:
>>> info all-registers fpsr
fpsr 0x10 [ IXC ]
>>> info all-registers fpcr
fpcr 0x0 [ RMode=0 ]
GDB has two approaches to generating the target descriptions found in
gdb/features/, the whole description approach, where the XML file
contains a complete target description which is then used to generate
a single C file that builds that target description. Or, the split
feature approach, where the XML files contain a single target feature,
each feature results in a single C file to create that one feature,
and then a manually written C file is used to build a complete target
description from individual features.
There's a Makefile, gdb/features/Makefile, which is responsible for
managing the regeneration of the C files from the XML files.
However, some of the logic that selects between the whole description
approach, or the split feature approach, is actually hard-coded into
GDB, inside target-descriptions.c:maint_print_c_tdesc_cmd we check the
path to the incoming XML file and use this to choose which type of C
file we should generate.
This commit removes this hard coding from GDB, and makes the Makefile
entirely responsible for choosing the approach. This makes sense as
the Makefile already has the XML files partitioned based on which
approach they should use.
In order to allow this change the 'maint print c-tdesc' command is
given a new command option '-single-feature', which tells GDB which
type of C file should be created. The makefile now supplies this flag
to GDB.
This did reveal a bug in features/Makefile, the rx.xml file was in the
wrong list, this didn't matter previously as the actual choice of
which approach to use was done in GDB. Now the Makefile decides, so
placing each XML file in the correct list is critical.
Tested this by doing 'make GDB=/path/to/gdb clean-cfiles cfiles' to
regenerate all the C files from their XML source. There are no
changes after this commit.
gdb/ChangeLog:
* features/Makefile (XMLTOC): Add rx.xml.
(FEATURE_XMLFILES): Remove rx.xml.
(FEATURE_CFILES rule): Pass '-single-feature' flag.
* features/rx.c: Regenerate.
* features/rx.xml: Wrap in `target` tags, and reindent.
* target-descriptions.c (struct maint_print_c_tdesc_options): New
structure.
(maint_print_c_tdesc_opt_def): New typedef.
(maint_print_c_tdesc_opt_defs): New static global.
(make_maint_print_c_tdesc_options_def_group): New function.
(maint_print_c_tdesc_cmd): Make use of command line flags, only
print single feature C file for target descriptions containing a
single feature.
(maint_print_c_tdesc_cmd_completer): New function.
(_initialize_target_descriptions): Update call to register command
completer, and include command line flag in help text.
gdb/doc/ChangeLog:
* gdb.texinfo (Maintenance Commands): Update description of 'maint
print c-tdesc'.
This adds support for the bfloat16 datatype, which can be seen as a short
version of FP32, skipping the least significant 16 bits of the mantissa.
Since the datatype is currently only supported by the AVX512 registers,
the printing of bfloat16 values is only supported for xmm, ymm and zmm
registers.
gdb/ChangeLog:
2020-09-11 Moritz Riesterer <moritz.riesterer@intel.com>
Felix Willgerodt <Felix.Willgerodt@intel.com>
* gdbarch.sh: Added bfloat16 type.
* gdbarch.c: Regenerated.
* gdbarch.h: Regenerated.
* gdbtypes.c (floatformats_bfloat16): New struct.
(gdbtypes_post_init): Add builtin_bfloat16.
* gdbtypes.h (struct builtin_type) <builtin_bfloat16>: New member.
(floatformats_bfloat16): New struct.
* i386-tdep.c (i386_zmm_type): Add field "v32_bfloat16"
(i386_ymm_type): Add field "v16_bfloat16"
(i386_gdbarch_init): Add set_gdbarch_bfloat16_format.
* target-descriptions.c (make_gdb_type): Add case TDESC_TYPE_BFLOAT16.
* gdbsupport/tdesc.cc (tdesc_predefined_types): New member bfloat16.
* gdbsupport/tdesc.h (tdesc_type_kind): New member TDESC_TYPE_BFLOAT16.
* features/i386/64bit-avx512.xml: Add bfloat16 type.
* features/i386/64bit-avx512.c: Regenerated.
* features/i386/64bit-sse.xml: Add bfloat16 type.
* features/i386/64bit-sse.c: Regenerated.
gdb/testsuite/ChangeLog:
2020-09-11 Moritz Riesterer <moritz.riesterer@intel.com>
Felix Willgerodt <Felix.Willgerodt@intel.com>
* x86-avx512bf16.c: New file.
* x86-avx512bf16.exp: Likewise.
* lib/gdb.exp (skip_avx512bf16_tests): New function.
A few changes have been made to make the register support simpler,
more flexible and extendible. The trigger for most of these changes
are the remarks [1] made earlier for v2 of this patch. The noticeable
improvements are:
- The arc XML target features are placed under gdb/features/arc
- There are two cores (based on ISA) and one auxiliary feature:
v1-core: ARC600, ARC601, ARC700
v2-core: ARC EM, ARC HS
aux: common in both
- The XML target features represent a minimalistic sane set of
registers irrespective of application (baremetal or linux).
- A concept of "feature" class has been introduced in the code.
The "feature" object is constructed from BFD and GDBARCH data.
It contains necessary information (ISA and register size) to
determine which XML target feature to use.
- A new structure (ARC_REGISTER_FEATURE) is added that allows
providing index, names, and the necessity of registers. This
simplifies the sanity checks and future extendibility.
- Documnetation has been updated to reflect ARC features better.
- Although the feature names has changed, there still exists
backward compatibility with older names through
find_obsolete_[core,aux]_names() functions.
The last two points were inspired from RiscV port.
[1]
https://sourceware.org/pipermail/gdb-patches/2020-May/168511.html
gdb/ChangeLog:
* arch/arc.h
(arc_gdbarch_features): New class to stir the selection of target XML.
(arc_create_target_description): Use FEATURES to choose XML target.
(arc_lookup_target_description): Use arc_create_target_description
to create _new_ target descriptions or return the already created
ones if the FEATURES is the same.
* arch/arc.c: Implementation of prototypes described above.
* gdb/arc-tdep.h (arc_regnum enum): Add more registers.
(arc_gdbarch_features_init): Initialize the FEATURES struct.
* arc-tdep.c (*_feature_name): Make feature names consistent.
(arc_register_feature): A new struct to hold information about
registers of a particular target/feature.
(arc_check_tdesc_feature): Check if XML provides registers in
compliance with ARC_REGISTER_FEATURE structs.
(arc_update_acc_reg_names): Add aliases for r58 and r59.
(determine_*_reg_feature_set): Which feature name to look for.
(arc_gdbarch_features_init): Given MACH and ABFD, initialize FEATURES.
(mach_type_to_arc_isa): Convert from a set of binutils machine types
to expected ISA enums to be used in arc_gdbarch_features structs.
* features/Makefile (FEATURE_XMLFILES): Add new files.
* gdb/features/arc/v1-aux.c: New file.
* gdb/features/arc/v1-aux.xml: Likewise.
* gdb/features/arc/v1-core.c: Likewise.
* gdb/features/arc/v1-core.xml: Likewise.
* gdb/features/arc/v2-aux.c: Likewise.
* gdb/features/arc/v2-aux.xml: Likewise.
* gdb/features/arc/v2-core.c: Likewise.
* gdb/features/arc/v2-core.xml: Likewise.
* NEWS (Changes since GDB 9): Announce obsolence of old feature names.
gdb/doc/ChangeLog:
* gdb.texinfo (Synopsys ARC): Update the documentation for ARC
Features.
gdb/testsuite/ChangeLog:
* gdb.arch/arc-tdesc-cpu.xml: Use new feature names.
There is currently a bug in the RISC-V CSR/FPU feature files. The
CSRs containing the FPU status registers are mentioned in both the FPU
feature file and the CSR feature file.
My original thinking when adding the FPU feature file was that it made
more sense to group the FPU status registers with the other FPU
state. This opened up the possibility of debugging very
simple (possibly simulator only) targets that had little more than CPU
and FPU available for GDB to access.
When I then added code to automatically generate the CSR XML file I
forgot to filter out the FPU status CSRs, so these registers were
mentioned twice.
Now for GDB's default RISC-V target descriptions this doesn't actually
matter. I did consider adding the CSRs to the default target
description, but in the end I didn't bother. The reasoning again was
simplicity; the default target description is only to be used when the
target doesn't supply its own description, and NOT supplying the CSRs
actually serves to encourage targets to supply an accurate
description. Combine this with the fact that the CSRs change from
revision to revision, sometimes in non-backward compatible ways, then
having a "default" set of CSRs just feels like a path to confusion and
complaints.
However, having a broken CSR XML file in the GDB source tree has had
one negative effect, QEMU has copied this file into its source tree,
and is using this as its description that it passes to GDB. That is
QEMU announces the FPU status registers twice, once in the FPU
feature, and once in the CSR feature.
This commit starts along the path back to sanity by deleting the
default CSR XML files from within GDB. These files were not used in
any way by current GDB, so there is absolutely no loss of
functionality with this change.
gdb/ChangeLog:
* features/Makefile: Remove all references to the deleted files
below.
* features/riscv/32bit-csr.c: Deleted.
* features/riscv/32bit-csr.xml: Deleted.
* features/riscv/64bit-csr.c: Deleted.
* features/riscv/64bit-csr.xml: Deleted.
* features/riscv/rebuild-csr-xml.sh: Deleted.
This patch removes the leftover regformats .dat files for the arm
architecture. There are no longer relevant, since the arm architecture
has been converted to use feature-based target-descriptions. These .dat
files are used by GDBserver ports that still use static target
descriptions.
These .dat files are generated from corresponding .xml files in the
features directory. And since the corresponding .xml files for these
arm .dat files don't exist anymore, it is impossible to re-generated
them. If you delete these .dat files and type "make" in the features
directory, you'll get:
make: *** No rule to make target '../regformats/arm/arm-with-iwmmxt.dat', needed by 'all'. Stop.
So it removes the entries in the `WHICH` variable of
gdb/features/Makefile.
Finally, it removes the rule in gdbserver/Makefile to generate .cc files
from `../gdb/regformats/arm/%.dat`.
gdb/ChangeLog:
* features/Makefile (WHICH): Remove arm files.
* regformats/arm/arm-with-iwmmxt.dat: Remove.
* regformats/arm/arm-with-neon.dat: Remove.
* regformats/arm/arm-with-vfpv2.dat: Remove.
* regformats/arm/arm-with-vfpv3.dat: Remove.
gdbserver/ChangeLog:
* Makefile.in (%-generated.cc: ../gdb/regformats/arm/%.dat):
Remove.
Change-Id: I3b7d989c50e2cb92235c1f7c7071a26839d84c78
When trying to run `make` in the features directory, in a clean repo, we
get:
Makefile:254: warning: overriding recipe for target 'rx.c'
Makefile:250: warning: ignoring old recipe for target 'rx.c'
make: Nothing to be done for 'all'.
The warnings come from the fact that `rx.xml` is present in two lists,
causing two `rx.c` targets to be defined. It is ok for it to be in the
FEATURES_XMLFILES list, as this architecture uses the "feature-based"
target-descriptions. It shouldn't be in the XMLTOC list, as this is for
architectures that define complete/static target descriptions as XML
files.
gdb/ChangeLog:
* features/Makefile (XMLTOC): Remove rx.xml.
Change-Id: Iada4ab54b3d4542588fac543d16ee35a92537319
We add new arguments defined and aborted verisons for DECLARE_CSR to
support privileged versions controling in binutils. Therefore, the
rebuild-csr-xml.sh should be updated, too.
gdb/
* features/riscv/rebuild-csr-xml.sh: Updated.
This patch replaces usage of target descriptions in ARC, where the whole
description is fixed in XML, with new target descriptions where XML describes
individual features, and GDB assembles those features into actual target
description.
v2:
Removed arc.c from ALLDEPFILES in gdb/Makefile.in.
Removed vim modeline from arc-tdep.c to have it in a separate patch.
Removed braces from one line "if/else".
Undid the type change for "jb_pc" (kept it as "int").
Joined the unnecessary line breaks into one line.
No more moving around arm targets in gdb/features/Makefile.
Changed pattern checking for ARC features from "arc/{aux,core}" to "arc/".
v3:
Added include gaurds to arc.h.
Added arc_read_description to _create_ target descriptions less.
v4:
Got rid of ARC_SYS_TYPE_NONE.
Renamed ARC_SYS_TYPE_INVALID to ARC_SYS_TYPE_NUM.
Fixed a few indentations/curly braces.
Converted arc_sys_type_to_str from a macro to an inline function.
gdb/ChangeLog:
2020-03-16 Anton Kolesov <anton.kolesov@synopsys.com>
Shahab Vahedi <shahab@synopsys.com>
* Makefile.in: Add arch/arc.o
* configure.tgt: Likewise.
* arc-tdep.c (arc_tdesc_init): Use arc_read_description.
(_initialize_arc_tdep): Don't initialize old target descriptions.
(arc_read_description): New function to cache target descriptions.
* arc-tdep.h (arc_read_description): Add proto type.
* arch/arc.c: New file.
* arch/arc.h: Likewise.
* features/Makefile: Replace old target descriptions with new.
* features/arc-arcompact.c: Remove.
* features/arc-arcompact.xml: Likewise.
* features/arc-v2.c: Likewise
* features/arc-v2.xml: Likewise
* features/arc/aux-arcompact.xml: New file.
* features/arc/aux-v2.xml: Likewise.
* features/arc/core-arcompact.xml: Likewise.
* features/arc/core-v2.xml: Likewise.
* features/arc/aux-arcompact.c: Generate.
* features/arc/aux-v2.c: Likewise.
* features/arc/core-arcompact.c: Likewise.
* features/arc/core-v2.c: Likewise.
* target-descriptions (maint_print_c_tdesc_cmd): Support ARC features.
According to the riscv privilege spec, some CSR are only valid when rv32 or
the specific extension is set. We extend the DECLARE_CSR and DECLARE_CSR_ALIAS
to record more informaton we need, and then check whether the CSR is valid
according to these information. We report warning message when the CSR is
invalid, so we have a choice between error and warning by --fatal-warnings
option. Also, a --no-warn/-W option is used to turn the warnings off, if
people don't want the warnings.
gas/
* config/tc-riscv.c (enum riscv_csr_class): New enum. Used to decide
whether or not this CSR is legal in the current ISA string.
(struct riscv_csr_extra): New structure to hold all extra information
of CSR.
(riscv_init_csr_hash): New function. According to the DECLARE_CSR and
DECLARE_CSR_ALIAS, insert CSR extra information into csr_extra_hash.
Call hash_reg_name to insert CSR address into reg_names_hash.
(md_begin): Call riscv_init_csr_hashes for each DECLARE_CSR.
(reg_csr_lookup_internal, riscv_csr_class_check): New functions.
Decide whether the CSR is valid according to the csr_extra_hash.
(init_opcode_hash): Update 'if (hash_error != NULL)' as hash_error is
not a boolean. This is same as riscv_init_csr_hash, so keep the
consistent usage.
* testsuite/gas/riscv/csr-dw-regnums.d: Add -march=rv32if option.
* testsuite/gas/riscv/priv-reg.d: Add f-ext by -march option.
* testsuite/gas/riscv/priv-reg-fail-fext.d: New testcase. The source
file is `priv-reg.s`, and the ISA is rv32i without f-ext, so the
f-ext CSR are not allowed.
* testsuite/gas/riscv/priv-reg-fail-fext.l: Likewise.
* testsuite/gas/riscv/priv-reg-fail-rv32-only.d: New testcase. The
source file is `priv-reg.s`, and the ISA is rv64if, so the
rv32-only CSR are not allowed.
* testsuite/gas/riscv/priv-reg-fail-rv32-only.l: Likewise.
include/
* opcode/riscv-opc.h: Extend DECLARE_CSR and DECLARE_CSR_ALIAS to
record riscv_csr_class.
opcodes/
* riscv-dis.c (print_insn_args): Updated since the DECLARE_CSR is changed.
gdb/
* riscv-tdep.c: Updated since the DECLARE_CSR is changed.
* riscv-tdep.h: Likewise.
* features/riscv/rebuild-csr-xml.sh: Generate the 64bit-csr.xml without
rv32-only CSR.
* features/riscv/64bit-csr.xml: Regernated.
binutils/
* dwarf.c: Updated since the DECLARE_CSR is changed.
xml-builtin.c only has character arrays and no dependencies, so this
creates a simple header file for that purpose so that gdbserver
can include that instead of re-declaring xml_builtin.
Despite the name, feature_to_c.sh is already specific to xml_builtins
(it hardcodes the variable name), so making it always output the
include for xml-builtin.h seems fine.
gdb/ChangeLog:
2019-10-16 Christian Biesinger <cbiesinger@google.com>
* Makefile.in: Add xml-builtin.h.
* features/feature_to_c.sh: Add an include for xml-builtin.h
to ensure that the compiler checks that the types match.
* xml-builtin.h: New file.
* xml-support.c (fetch_xml_builtin): Add missing const.
* xml-support.h: Remove declaration of xml_builtins.
gdb/gdbserver/ChangeLog:
2019-10-16 Christian Biesinger <cbiesinger@google.com>
* server.c: Include xml-builtin.h.
(get_xml_features): Don't declare xml_builtins here.
Change-Id: I806ef0851c43ead90b545a11794e41f5e5178436
