[PATCH v2 1/5] gdb: LoongArch: Add initial target description support
Tiezhu Yang
yangtiezhu@loongson.cn
Thu Jan 20 00:50:07 GMT 2022
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>
---
gdb/arch/loongarch.c | 88 +++++++++++++++++++++++++++++++
gdb/arch/loongarch.h | 73 +++++++++++++++++++++++++
gdb/doc/gdb.texinfo | 10 ++++
gdb/features/loongarch/base32.c | 47 +++++++++++++++++
gdb/features/loongarch/base32.xml | 44 ++++++++++++++++
gdb/features/loongarch/base64.c | 47 +++++++++++++++++
gdb/features/loongarch/base64.xml | 44 ++++++++++++++++
7 files changed, 353 insertions(+)
create mode 100644 gdb/arch/loongarch.c
create mode 100644 gdb/arch/loongarch.h
create mode 100644 gdb/features/loongarch/base32.c
create mode 100644 gdb/features/loongarch/base32.xml
create mode 100644 gdb/features/loongarch/base64.c
create mode 100644 gdb/features/loongarch/base64.xml
diff --git a/gdb/arch/loongarch.c b/gdb/arch/loongarch.c
new file mode 100644
index 00000000000..934f6e489c5
--- /dev/null
+++ b/gdb/arch/loongarch.c
@@ -0,0 +1,88 @@
+/* Copyright (C) 2022 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "gdbsupport/common-defs.h"
+#include "loongarch.h"
+#include <stdlib.h>
+#include <unordered_map>
+
+/* Target description features. */
+
+#include "../features/loongarch/base32.c"
+#include "../features/loongarch/base64.c"
+
+static target_desc_up
+loongarch_create_target_description (const struct loongarch_gdbarch_features features)
+{
+ /* Now we should create a new target description. */
+ target_desc_up tdesc = allocate_target_description ();
+
+ std::string arch_name = "loongarch";
+
+ if (features.xlen == 4)
+ arch_name.append ("32");
+ else if (features.xlen == 8)
+ arch_name.append ("64");
+
+ set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
+
+ long regnum = 0;
+
+ /* For now we only support creating 32-bit or 64-bit x-registers. */
+ if (features.xlen == 4)
+ regnum = create_feature_loongarch_base32 (tdesc.get (), regnum);
+ else if (features.xlen == 8)
+ regnum = create_feature_loongarch_base64 (tdesc.get (), regnum);
+
+ return tdesc;
+}
+
+/* Wrapper used by std::unordered_map to generate hash for feature set. */
+struct loongarch_gdbarch_features_hasher
+{
+ std::size_t
+ operator() (const loongarch_gdbarch_features &features) const noexcept
+ {
+ return features.hash ();
+ }
+};
+
+/* Cache of previously seen target descriptions, indexed by the feature set
+ that created them. */
+static std::unordered_map<loongarch_gdbarch_features,
+ const target_desc_up,
+ loongarch_gdbarch_features_hasher> loongarch_tdesc_cache;
+
+const target_desc *
+loongarch_lookup_target_description (const struct loongarch_gdbarch_features features)
+{
+ /* Lookup in the cache. If we find it then return the pointer out of
+ the target_desc_up (which is a unique_ptr). This is safe as the
+ loongarch_tdesc_cache will exist until GDB exits. */
+ const auto it = loongarch_tdesc_cache.find (features);
+ if (it != loongarch_tdesc_cache.end ())
+ return it->second.get ();
+
+ target_desc_up tdesc (loongarch_create_target_description (features));
+
+ /* Add to the cache, and return a pointer borrowed from the
+ target_desc_up. This is safe as the cache (and the pointers
+ contained within it) are not deleted until GDB exits. */
+ target_desc *ptr = tdesc.get ();
+ loongarch_tdesc_cache.emplace (features, std::move (tdesc));
+ return ptr;
+}
diff --git a/gdb/arch/loongarch.h b/gdb/arch/loongarch.h
new file mode 100644
index 00000000000..9e10df967d1
--- /dev/null
+++ b/gdb/arch/loongarch.h
@@ -0,0 +1,73 @@
+/* Common target-dependent functionality for LoongArch
+
+ Copyright (C) 2022 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef ARCH_LOONGARCH_H
+#define ARCH_LOONGARCH_H
+
+#include "gdbsupport/tdesc.h"
+
+/* The set of LoongArch architectural features that we track that impact how
+ we configure the actual gdbarch instance. We hold one of these in the
+ gdbarch_tdep structure, and use it to distinguish between different
+ LoongArch gdbarch instances.
+
+ The information in here ideally comes from the target description,
+ however, if the target doesn't provide a target description then we will
+ create a default target description by first populating one of these
+ based on what we know about the binary being executed, and using that to
+ drive default target description creation. */
+
+struct loongarch_gdbarch_features
+{
+ /* The size of the x-registers in bytes. This is either 4 (loongarch32)
+ or 8 (loongarch64). No other value is valid. Initialise to the invalid
+ 0 value so we can spot if one of these is used uninitialised. */
+ int xlen = 0;
+
+ /* Equality operator. */
+ bool operator== (const struct loongarch_gdbarch_features &rhs) const
+ {
+ return (xlen == rhs.xlen);
+ }
+
+ /* Inequality operator. */
+ bool operator!= (const struct loongarch_gdbarch_features &rhs) const
+ {
+ return !((*this) == rhs);
+ }
+
+ /* Used by std::unordered_map to hash feature sets. */
+ std::size_t hash () const noexcept
+ {
+ std::size_t val = (xlen & 0x1f) << 5;
+ return val;
+ }
+};
+
+/* Lookup an already existing target description matching FEATURES, or
+ create a new target description if this is the first time we have seen
+ FEATURES. For the same FEATURES the same target_desc is always
+ returned. This is important when trying to lookup gdbarch objects as
+ GDBARCH_LIST_LOOKUP_BY_INFO performs a pointer comparison on target
+ descriptions to find candidate gdbarch objects. */
+
+const target_desc *loongarch_lookup_target_description
+ (const struct loongarch_gdbarch_features features);
+
+#endif /* ARCH_LOONGARCH_H */
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index fe81687a66c..2ef0368127b 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -46223,6 +46223,7 @@ registers using the capitalization used in the description.
* ARC Features::
* ARM Features::
* i386 Features::
+* LoongArch Features::
* MicroBlaze Features::
* MIPS Features::
* M68K Features::
@@ -46451,6 +46452,15 @@ The @samp{org.gnu.gdb.i386.pkeys} feature is optional. It should
describe a single register, @samp{pkru}. It is a 32-bit register
valid for i386 and amd64.
+@node LoongArch Features
+@subsection LoongArch Features
+@cindex target descriptions, LoongArch Features
+
+The @samp{org.gnu.gdb.loongarch.base} feature is required for LoongArch
+targets. It should contain the registers @samp{r0} through @samp{r31},
+@samp{pc}, and @samp{badv}. Either the architectural names (@samp{r0},
+@samp{r1}, etc) can be used, or the ABI names (@samp{zero}, @samp{ra}, etc).
+
@node MicroBlaze Features
@subsection MicroBlaze Features
@cindex target descriptions, MicroBlaze features
diff --git a/gdb/features/loongarch/base32.c b/gdb/features/loongarch/base32.c
new file mode 100644
index 00000000000..7105c152aed
--- /dev/null
+++ b/gdb/features/loongarch/base32.c
@@ -0,0 +1,47 @@
+/* THIS FILE IS GENERATED. -*- buffer-read-only: t -*- vi:set ro:
+ Original: base32.xml */
+
+#include "gdbsupport/tdesc.h"
+
+static int
+create_feature_loongarch_base32 (struct target_desc *result, long regnum)
+{
+ struct tdesc_feature *feature;
+
+ feature = tdesc_create_feature (result, "org.gnu.gdb.loongarch.base");
+ tdesc_create_reg (feature, "r0", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r1", regnum++, 1, "general", 32, "code_ptr");
+ tdesc_create_reg (feature, "r2", regnum++, 1, "general", 32, "data_ptr");
+ tdesc_create_reg (feature, "r3", regnum++, 1, "general", 32, "data_ptr");
+ tdesc_create_reg (feature, "r4", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r5", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r6", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r7", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r8", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r9", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r10", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r11", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r12", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r13", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r14", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r15", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r16", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r17", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r18", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r19", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r20", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r21", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r22", regnum++, 1, "general", 32, "data_ptr");
+ tdesc_create_reg (feature, "r23", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r24", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r25", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r26", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r27", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r28", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r29", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r30", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "r31", regnum++, 1, "general", 32, "uint32");
+ tdesc_create_reg (feature, "pc", regnum++, 1, "general", 32, "code_ptr");
+ tdesc_create_reg (feature, "badv", regnum++, 1, "general", 32, "code_ptr");
+ return regnum;
+}
diff --git a/gdb/features/loongarch/base32.xml b/gdb/features/loongarch/base32.xml
new file mode 100644
index 00000000000..5b00f8a8d37
--- /dev/null
+++ b/gdb/features/loongarch/base32.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2022 Free Software Foundation, Inc.
+
+ Copying and distribution of this file, with or without modification,
+ are permitted in any medium without royalty provided the copyright
+ notice and this notice are preserved. -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.loongarch.base">
+ <reg name="r0" bitsize="32" type="uint32" group="general"/>
+ <reg name="r1" bitsize="32" type="code_ptr" group="general"/>
+ <reg name="r2" bitsize="32" type="data_ptr" group="general"/>
+ <reg name="r3" bitsize="32" type="data_ptr" group="general"/>
+ <reg name="r4" bitsize="32" type="uint32" group="general"/>
+ <reg name="r5" bitsize="32" type="uint32" group="general"/>
+ <reg name="r6" bitsize="32" type="uint32" group="general"/>
+ <reg name="r7" bitsize="32" type="uint32" group="general"/>
+ <reg name="r8" bitsize="32" type="uint32" group="general"/>
+ <reg name="r9" bitsize="32" type="uint32" group="general"/>
+ <reg name="r10" bitsize="32" type="uint32" group="general"/>
+ <reg name="r11" bitsize="32" type="uint32" group="general"/>
+ <reg name="r12" bitsize="32" type="uint32" group="general"/>
+ <reg name="r13" bitsize="32" type="uint32" group="general"/>
+ <reg name="r14" bitsize="32" type="uint32" group="general"/>
+ <reg name="r15" bitsize="32" type="uint32" group="general"/>
+ <reg name="r16" bitsize="32" type="uint32" group="general"/>
+ <reg name="r17" bitsize="32" type="uint32" group="general"/>
+ <reg name="r18" bitsize="32" type="uint32" group="general"/>
+ <reg name="r19" bitsize="32" type="uint32" group="general"/>
+ <reg name="r20" bitsize="32" type="uint32" group="general"/>
+ <reg name="r21" bitsize="32" type="uint32" group="general"/>
+ <reg name="r22" bitsize="32" type="data_ptr" group="general"/>
+ <reg name="r23" bitsize="32" type="uint32" group="general"/>
+ <reg name="r24" bitsize="32" type="uint32" group="general"/>
+ <reg name="r25" bitsize="32" type="uint32" group="general"/>
+ <reg name="r26" bitsize="32" type="uint32" group="general"/>
+ <reg name="r27" bitsize="32" type="uint32" group="general"/>
+ <reg name="r28" bitsize="32" type="uint32" group="general"/>
+ <reg name="r29" bitsize="32" type="uint32" group="general"/>
+ <reg name="r30" bitsize="32" type="uint32" group="general"/>
+ <reg name="r31" bitsize="32" type="uint32" group="general"/>
+ <reg name="pc" bitsize="32" type="code_ptr" group="general"/>
+ <reg name="badv" bitsize="32" type="code_ptr" group="general"/>
+</feature>
diff --git a/gdb/features/loongarch/base64.c b/gdb/features/loongarch/base64.c
new file mode 100644
index 00000000000..63eee024554
--- /dev/null
+++ b/gdb/features/loongarch/base64.c
@@ -0,0 +1,47 @@
+/* THIS FILE IS GENERATED. -*- buffer-read-only: t -*- vi:set ro:
+ Original: base64.xml */
+
+#include "gdbsupport/tdesc.h"
+
+static int
+create_feature_loongarch_base64 (struct target_desc *result, long regnum)
+{
+ struct tdesc_feature *feature;
+
+ feature = tdesc_create_feature (result, "org.gnu.gdb.loongarch.base");
+ tdesc_create_reg (feature, "r0", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r1", regnum++, 1, "general", 64, "code_ptr");
+ tdesc_create_reg (feature, "r2", regnum++, 1, "general", 64, "data_ptr");
+ tdesc_create_reg (feature, "r3", regnum++, 1, "general", 64, "data_ptr");
+ tdesc_create_reg (feature, "r4", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r5", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r6", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r7", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r8", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r9", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r10", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r11", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r12", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r13", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r14", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r15", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r16", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r17", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r18", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r19", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r20", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r21", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r22", regnum++, 1, "general", 64, "data_ptr");
+ tdesc_create_reg (feature, "r23", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r24", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r25", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r26", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r27", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r28", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r29", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r30", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "r31", regnum++, 1, "general", 64, "uint64");
+ tdesc_create_reg (feature, "pc", regnum++, 1, "general", 64, "code_ptr");
+ tdesc_create_reg (feature, "badv", regnum++, 1, "general", 64, "code_ptr");
+ return regnum;
+}
diff --git a/gdb/features/loongarch/base64.xml b/gdb/features/loongarch/base64.xml
new file mode 100644
index 00000000000..bef91e50dd7
--- /dev/null
+++ b/gdb/features/loongarch/base64.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2022 Free Software Foundation, Inc.
+
+ Copying and distribution of this file, with or without modification,
+ are permitted in any medium without royalty provided the copyright
+ notice and this notice are preserved. -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.loongarch.base">
+ <reg name="r0" bitsize="64" type="uint64" group="general"/>
+ <reg name="r1" bitsize="64" type="code_ptr" group="general"/>
+ <reg name="r2" bitsize="64" type="data_ptr" group="general"/>
+ <reg name="r3" bitsize="64" type="data_ptr" group="general"/>
+ <reg name="r4" bitsize="64" type="uint64" group="general"/>
+ <reg name="r5" bitsize="64" type="uint64" group="general"/>
+ <reg name="r6" bitsize="64" type="uint64" group="general"/>
+ <reg name="r7" bitsize="64" type="uint64" group="general"/>
+ <reg name="r8" bitsize="64" type="uint64" group="general"/>
+ <reg name="r9" bitsize="64" type="uint64" group="general"/>
+ <reg name="r10" bitsize="64" type="uint64" group="general"/>
+ <reg name="r11" bitsize="64" type="uint64" group="general"/>
+ <reg name="r12" bitsize="64" type="uint64" group="general"/>
+ <reg name="r13" bitsize="64" type="uint64" group="general"/>
+ <reg name="r14" bitsize="64" type="uint64" group="general"/>
+ <reg name="r15" bitsize="64" type="uint64" group="general"/>
+ <reg name="r16" bitsize="64" type="uint64" group="general"/>
+ <reg name="r17" bitsize="64" type="uint64" group="general"/>
+ <reg name="r18" bitsize="64" type="uint64" group="general"/>
+ <reg name="r19" bitsize="64" type="uint64" group="general"/>
+ <reg name="r20" bitsize="64" type="uint64" group="general"/>
+ <reg name="r21" bitsize="64" type="uint64" group="general"/>
+ <reg name="r22" bitsize="64" type="data_ptr" group="general"/>
+ <reg name="r23" bitsize="64" type="uint64" group="general"/>
+ <reg name="r24" bitsize="64" type="uint64" group="general"/>
+ <reg name="r25" bitsize="64" type="uint64" group="general"/>
+ <reg name="r26" bitsize="64" type="uint64" group="general"/>
+ <reg name="r27" bitsize="64" type="uint64" group="general"/>
+ <reg name="r28" bitsize="64" type="uint64" group="general"/>
+ <reg name="r29" bitsize="64" type="uint64" group="general"/>
+ <reg name="r30" bitsize="64" type="uint64" group="general"/>
+ <reg name="r31" bitsize="64" type="uint64" group="general"/>
+ <reg name="pc" bitsize="64" type="code_ptr" group="general"/>
+ <reg name="badv" bitsize="64" type="code_ptr" group="general"/>
+</feature>
--
2.27.0
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