[PATCH v2] target/loongarch/gdbstub: Add vector registers support

[Song Gao]

GDB already support LoongArch vector extension[1], QEMU gdb adds
LoongArch vector registers support, so that users can use 'info all-registers'
to get all vector registers values.

[1]: 
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=1e9569f383a3d5a88ee07d0c2401bd95613c222e

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
based-on: 
 https://patchew.org/QEMU/20240607035016.2975799-1-maobibo@loongson.cn/

v2:
- fix tab line wrapper issue.
- Link to v1: 
https://patchew.org/QEMU/20240621065406.864232-1-gaosong@loongson.cn/ 

 configs/targets/loongarch64-linux-user.mak |  2 +-
 configs/targets/loongarch64-softmmu.mak    |  2 +-
 target/loongarch/gdbstub.c                 | 70 +++++++++++++++++++++-
 gdb-xml/loongarch-lasx.xml                 | 60 +++++++++++++++++++
 gdb-xml/loongarch-lsx.xml                  | 59 ++++++++++++++++++
 5 files changed, 189 insertions(+), 4 deletions(-)
 create mode 100644 gdb-xml/loongarch-lasx.xml
 create mode 100644 gdb-xml/loongarch-lsx.xml

diff --git a/configs/targets/loongarch64-linux-user.mak 
b/configs/targets/loongarch64-linux-user.mak
index d878e5a113..ea9b7e839a 100644
--- a/configs/targets/loongarch64-linux-user.mak
+++ b/configs/targets/loongarch64-linux-user.mak
@@ -1,4 +1,4 @@
 # Default configuration for loongarch64-linux-user
 TARGET_ARCH=loongarch64
 TARGET_BASE_ARCH=loongarch
-TARGET_XML_FILES=gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml
+TARGET_XML_FILES=gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml 
gdb-xml/loongarch-lsx.xml gdb-xml/loongarch-lasx.xml
diff --git a/configs/targets/loongarch64-softmmu.mak 
b/configs/targets/loongarch64-softmmu.mak
index 65b65e0c34..ce19ab6a16 100644
--- a/configs/targets/loongarch64-softmmu.mak
+++ b/configs/targets/loongarch64-softmmu.mak
@@ -2,6 +2,6 @@ TARGET_ARCH=loongarch64
 TARGET_BASE_ARCH=loongarch
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_SUPPORTS_MTTCG=y
-TARGET_XML_FILES= gdb-xml/loongarch-base32.xml gdb-xml/loongarch-base64.xml 
gdb-xml/loongarch-fpu.xml
+TARGET_XML_FILES= gdb-xml/loongarch-base32.xml gdb-xml/loongarch-base64.xml 
gdb-xml/loongarch-fpu.xml gdb-xml/loongarch-lsx.xml gdb-xml/loongarch-lasx.xml
 # all boards require libfdt
 TARGET_NEED_FDT=y
diff --git a/target/loongarch/gdbstub.c b/target/loongarch/gdbstub.c
index a0e1439bd0..8ac327d286 100644
--- a/target/loongarch/gdbstub.c
+++ b/target/loongarch/gdbstub.c
@@ -116,8 +116,74 @@ static int loongarch_gdb_set_fpu(CPUState *cs, uint8_t 
*mem_buf, int n)
     return length;
 }
 
+static int loongarch_gdb_get_vec(CPUState *cs, GByteArray *mem_buf, int n, int 
vl)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+    CPULoongArchState *env = &cpu->env;
+    int i, length = 0;
+
+    if (0 <= n && n < 32) {
+        for (i = 0; i < vl / 64; i++) {
+            length += gdb_get_reg64(mem_buf, env->fpr[n].vreg.D(i));
+        }
+    }
+
+    return length;
+}
+
+static int loongarch_gdb_set_vec(CPUState *cs, uint8_t *mem_buf, int n, int vl)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+    CPULoongArchState *env = &cpu->env;
+    int i, length = 0;
+
+    if (0 <= n && n < 32) {
+        for (i = 0; i < vl / 64; i++) {
+            env->fpr[n].vreg.D(i) = ldq_le_p(mem_buf + 8 * i);
+            length += 8;
+        }
+    }
+
+    return length;
+}
+
+static int loongarch_gdb_get_lsx(CPUState *cs, GByteArray *mem_buf, int n)
+{
+    return loongarch_gdb_get_vec(cs, mem_buf, n, LSX_LEN);
+}
+
+static int loongarch_gdb_set_lsx(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    return loongarch_gdb_set_vec(cs, mem_buf, n, LSX_LEN);
+}
+
+static int loongarch_gdb_get_lasx(CPUState *cs, GByteArray *mem_buf, int n)
+{
+    return loongarch_gdb_get_vec(cs, mem_buf, n, LASX_LEN);
+}
+
+static int loongarch_gdb_set_lasx(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    return loongarch_gdb_set_vec(cs, mem_buf, n, LASX_LEN);
+}
+
 void loongarch_cpu_register_gdb_regs_for_features(CPUState *cs)
 {
-    gdb_register_coprocessor(cs, loongarch_gdb_get_fpu, loongarch_gdb_set_fpu,
-                             gdb_find_static_feature("loongarch-fpu.xml"), 0);
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+    CPULoongArchState *env = &cpu->env;
+
+    if (FIELD_EX32(env->cpucfg[2], CPUCFG2, FP)) {
+        gdb_register_coprocessor(cs, loongarch_gdb_get_fpu, 
loongarch_gdb_set_fpu,
+                                 gdb_find_static_feature("loongarch-fpu.xml"), 
0);
+    }
+
+    if (FIELD_EX32(env->cpucfg[2], CPUCFG2, LSX)) {
+        gdb_register_coprocessor(cs, loongarch_gdb_get_lsx, 
loongarch_gdb_set_lsx,
+                                 gdb_find_static_feature("loongarch-lsx.xml"), 
0);
+    }
+
+    if (FIELD_EX32(env->cpucfg[2], CPUCFG2, LASX)) {
+        gdb_register_coprocessor(cs, loongarch_gdb_get_lasx, 
loongarch_gdb_set_lasx,
+                                 
gdb_find_static_feature("loongarch-lasx.xml"), 0);
+    }
 }
diff --git a/gdb-xml/loongarch-lasx.xml b/gdb-xml/loongarch-lasx.xml
new file mode 100644
index 0000000000..753b982c65
--- /dev/null
+++ b/gdb-xml/loongarch-lasx.xml
@@ -0,0 +1,60 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2022-2024 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.lasx">
+  <vector id="v8f32" type="ieee_single" count="8"/>
+  <vector id="v4f64" type="ieee_double" count="4"/>
+  <vector id="v32i8" type="int8" count="32"/>
+  <vector id="v16i16" type="int16" count="16"/>
+  <vector id="v8i32" type="int32" count="8"/>
+  <vector id="v4i64" type="int64" count="4"/>
+  <vector id="v2ui128" type="uint128" count="2"/>
+
+  <union id="lasxv">
+    <field name="v8_float" type="v8f32"/>
+    <field name="v4_double" type="v4f64"/>
+    <field name="v32_int8" type="v32i8"/>
+    <field name="v16_int16" type="v16i16"/>
+    <field name="v8_int32" type="v8i32"/>
+    <field name="v4_int64" type="v4i64"/>
+    <field name="v2_uint128" type="v2ui128"/>
+  </union>
+
+  <reg name="xr0" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr1" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr2" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr3" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr4" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr5" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr6" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr7" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr8" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr9" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr10" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr11" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr12" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr13" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr14" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr15" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr16" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr17" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr18" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr19" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr20" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr21" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr22" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr23" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr24" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr25" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr26" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr27" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr28" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr29" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr30" bitsize="256" type="lasxv" group="lasx"/>
+  <reg name="xr31" bitsize="256" type="lasxv" group="lasx"/>
+</feature>
diff --git a/gdb-xml/loongarch-lsx.xml b/gdb-xml/loongarch-lsx.xml
new file mode 100644
index 0000000000..51af1c6fd5
--- /dev/null
+++ b/gdb-xml/loongarch-lsx.xml
@@ -0,0 +1,59 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2022-2024 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.lsx">
+  <vector id="v4f32" type="ieee_single" count="4"/>
+  <vector id="v2f64" type="ieee_double" count="2"/>
+  <vector id="v16i8" type="int8" count="16"/>
+  <vector id="v8i16" type="int16" count="8"/>
+  <vector id="v4i32" type="int32" count="4"/>
+  <vector id="v2i64" type="int64" count="2"/>
+
+  <union id="lsxv">
+    <field name="v4_float" type="v4f32"/>
+    <field name="v2_double" type="v2f64"/>
+    <field name="v16_int8" type="v16i8"/>
+    <field name="v8_int16" type="v8i16"/>
+    <field name="v4_int32" type="v4i32"/>
+    <field name="v2_int64" type="v2i64"/>
+    <field name="uint128" type="uint128"/>
+  </union>
+
+  <reg name="vr0" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr1" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr2" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr3" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr4" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr5" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr6" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr7" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr8" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr9" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr10" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr11" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr12" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr13" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr14" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr15" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr16" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr17" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr18" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr19" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr20" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr21" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr22" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr23" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr26" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr25" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr26" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr27" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr28" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr29" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr30" bitsize="128" type="lsxv" group="lsx"/>
+  <reg name="vr31" bitsize="128" type="lsxv" group="lsx"/>
+</feature>
-- 
2.34.1