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authorYouling Tang <tangyouling@loongson.cn>2022-05-30 20:08:30 +0800
committerTiezhu Yang <yangtiezhu@loongson.cn>2022-06-14 22:21:43 +0800
commite5ab6af52d38ee068c1860ef113b7db4cc985cfb (patch)
tree8bad8cacb35f0635adbe82e3ed6837c0f5b9e3ef
parent476288fa2bddecf0f0e13dee826a076309bf01fe (diff)
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gdbserver: Add LoongArch/Linux support
Implement LoongArch/Linux support, including XML target description handling based on features determined, GPR regset support, and software breakpoint handling. In the Linux kernel code of LoongArch, ptrace implements PTRACE_POKEUSR and PTRACE_PEEKUSR in the arch_ptrace function, so srv_linux_usrregs is set to yes. With this patch on LoongArch: $ make check-gdb TESTS="gdb.server/server-connect.exp" [...] # of expected passes 18 [...] Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
-rw-r--r--gdb/NEWS3
-rw-r--r--gdb/arch/loongarch.c12
-rw-r--r--gdb/arch/loongarch.h13
-rw-r--r--gdbserver/Makefile.in2
-rw-r--r--gdbserver/configure.srv6
-rw-r--r--gdbserver/linux-loongarch-low.cc245
6 files changed, 280 insertions, 1 deletions
diff --git a/gdb/NEWS b/gdb/NEWS
index 7164e18..0efcce7 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -694,6 +694,8 @@ QMemTags
** GDBserver is now supported on RISC-V GNU/Linux.
+ ** GDBserver is now supported on LoongArch GNU/Linux.
+
** GDBserver no longer supports these host triplets:
i[34567]86-*-lynxos*
@@ -785,6 +787,7 @@ alias [-a] [--] ALIAS = COMMAND [DEFAULT-ARGS...]
* New targets
GNU/Linux/RISC-V (gdbserver) riscv*-*-linux*
+GNU/Linux/LoongArch (gdbserver) loongarch*-*-linux*
BPF bpf-unknown-none
Z80 z80-unknown-*
diff --git a/gdb/arch/loongarch.c b/gdb/arch/loongarch.c
index 934f6e4..11310c1 100644
--- a/gdb/arch/loongarch.c
+++ b/gdb/arch/loongarch.c
@@ -25,7 +25,13 @@
#include "../features/loongarch/base32.c"
#include "../features/loongarch/base64.c"
-static target_desc_up
+#ifndef GDBSERVER
+#define STATIC_IN_GDB static
+#else
+#define STATIC_IN_GDB
+#endif
+
+STATIC_IN_GDB target_desc_up
loongarch_create_target_description (const struct loongarch_gdbarch_features features)
{
/* Now we should create a new target description. */
@@ -51,6 +57,8 @@ loongarch_create_target_description (const struct loongarch_gdbarch_features fea
return tdesc;
}
+#ifndef GDBSERVER
+
/* Wrapper used by std::unordered_map to generate hash for feature set. */
struct loongarch_gdbarch_features_hasher
{
@@ -86,3 +94,5 @@ loongarch_lookup_target_description (const struct loongarch_gdbarch_features fea
loongarch_tdesc_cache.emplace (features, std::move (tdesc));
return ptr;
}
+
+#endif /* !GDBSERVER */
diff --git a/gdb/arch/loongarch.h b/gdb/arch/loongarch.h
index 9e10df9..8194ea6 100644
--- a/gdb/arch/loongarch.h
+++ b/gdb/arch/loongarch.h
@@ -60,6 +60,17 @@ struct loongarch_gdbarch_features
}
};
+#ifdef GDBSERVER
+
+/* Create and return a target description that is compatible with FEATURES.
+ This is only used directly from the gdbserver where the created target
+ description is modified after it is return. */
+
+target_desc_up loongarch_create_target_description
+ (const struct loongarch_gdbarch_features features);
+
+#else
+
/* 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
@@ -70,4 +81,6 @@ struct loongarch_gdbarch_features
const target_desc *loongarch_lookup_target_description
(const struct loongarch_gdbarch_features features);
+#endif /* GDBSERVER */
+
#endif /* ARCH_LOONGARCH_H */
diff --git a/gdbserver/Makefile.in b/gdbserver/Makefile.in
index 6e14278..75e4977 100644
--- a/gdbserver/Makefile.in
+++ b/gdbserver/Makefile.in
@@ -176,6 +176,7 @@ SFILES = \
$(srcdir)/linux-arc-low.cc \
$(srcdir)/linux-arm-low.cc \
$(srcdir)/linux-ia64-low.cc \
+ $(srcdir)/linux-loongarch-low.cc \
$(srcdir)/linux-low.cc \
$(srcdir)/linux-m68k-low.cc \
$(srcdir)/linux-mips-low.cc \
@@ -211,6 +212,7 @@ SFILES = \
$(srcdir)/../gdb/arch/arm.c \
$(srcdir)/../gdb/arch/arm-get-next-pcs.c \
$(srcdir)/../gdb/arch/arm-linux.c \
+ $(srcdir)/../gdb/arch/loongarch.c \
$(srcdir)/../gdb/arch/ppc-linux-common.c \
$(srcdir)/../gdb/arch/riscv.c \
$(srcdir)/../gdb/nat/aarch64-mte-linux-ptrace.c \
diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index d370536..ebb6b32 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -126,6 +126,12 @@ case "${gdbserver_host}" in
srv_tgtobj="$srv_linux_obj linux-ia64-low.o"
srv_linux_usrregs=yes
;;
+ loongarch*-*-linux*) srv_tgtobj="arch/loongarch.o linux-loongarch-low.o"
+ srv_tgtobj="${srv_tgtobj} ${srv_linux_obj}"
+ srv_linux_regsets=yes
+ srv_linux_usrregs=yes
+ srv_linux_thread_db=yes
+ ;;
m68*-*-linux*) if test "$gdb_cv_m68k_is_coldfire" = yes; then
srv_regobj=reg-cf.o
else
diff --git a/gdbserver/linux-loongarch-low.cc b/gdbserver/linux-loongarch-low.cc
new file mode 100644
index 0000000..5d37393
--- /dev/null
+++ b/gdbserver/linux-loongarch-low.cc
@@ -0,0 +1,245 @@
+/* GNU/Linux/LoongArch specific low level interface, for the remote server
+ for GDB.
+ 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 "server.h"
+#include "linux-low.h"
+#include "tdesc.h"
+#include "elf/common.h"
+#include "arch/loongarch.h"
+
+/* Linux target ops definitions for the LoongArch architecture. */
+
+class loongarch_target : public linux_process_target
+{
+public:
+
+ const regs_info *get_regs_info () override;
+
+ int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override;
+
+ const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
+
+protected:
+
+ void low_arch_setup () override;
+
+ bool low_cannot_fetch_register (int regno) override;
+
+ bool low_cannot_store_register (int regno) override;
+
+ bool low_fetch_register (regcache *regcache, int regno) override;
+
+ bool low_supports_breakpoints () override;
+
+ CORE_ADDR low_get_pc (regcache *regcache) override;
+
+ void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
+
+ bool low_breakpoint_at (CORE_ADDR pc) override;
+};
+
+/* The singleton target ops object. */
+
+static loongarch_target the_loongarch_target;
+
+bool
+loongarch_target::low_cannot_fetch_register (int regno)
+{
+ gdb_assert_not_reached ("linux target op low_cannot_fetch_register "
+ "is not implemented by the target");
+}
+
+bool
+loongarch_target::low_cannot_store_register (int regno)
+{
+ gdb_assert_not_reached ("linux target op low_cannot_store_register "
+ "is not implemented by the target");
+}
+
+/* Implementation of linux target ops method "low_arch_setup". */
+
+void
+loongarch_target::low_arch_setup ()
+{
+ static const char *expedite_regs[] = { "r3", "pc", NULL };
+ loongarch_gdbarch_features features;
+ target_desc_up tdesc;
+
+ features.xlen = sizeof (elf_greg_t);
+ tdesc = loongarch_create_target_description (features);
+
+ if (!tdesc->expedite_regs)
+ init_target_desc (tdesc.get (), expedite_regs);
+ current_process ()->tdesc = tdesc.release ();
+}
+
+/* Collect GPRs from REGCACHE into BUF. */
+
+static void
+loongarch_fill_gregset (struct regcache *regcache, void *buf)
+{
+ const struct target_desc *tdesc = regcache->tdesc;
+ elf_gregset_t *regset = (elf_gregset_t *) buf;
+ int regno = find_regno (tdesc, "r0");
+ int i;
+
+ for (i = 1; i < 32; i++)
+ collect_register (regcache, regno + i, *regset + i);
+ collect_register_by_name (regcache, "pc", *regset + 32);
+ collect_register_by_name (regcache, "badv", *regset + 33);
+}
+
+/* Supply GPRs from BUF into REGCACHE. */
+
+static void
+loongarch_store_gregset (struct regcache *regcache, const void *buf)
+{
+ const struct target_desc *tdesc = regcache->tdesc;
+ const elf_gregset_t *regset = (const elf_gregset_t *) buf;
+ int regno = find_regno (tdesc, "r0");
+ int i;
+
+ supply_register_zeroed (regcache, regno);
+ for (i = 1; i < 32; i++)
+ supply_register (regcache, regno + i, *regset + i);
+ supply_register_by_name (regcache, "pc", *regset + 32);
+ supply_register_by_name (regcache, "badv", *regset + 33);
+}
+
+/* LoongArch/Linux regsets. */
+static struct regset_info loongarch_regsets[] = {
+ { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof (elf_gregset_t),
+ GENERAL_REGS, loongarch_fill_gregset, loongarch_store_gregset },
+ NULL_REGSET
+};
+
+/* LoongArch/Linux regset information. */
+static struct regsets_info loongarch_regsets_info =
+ {
+ loongarch_regsets, /* regsets */
+ 0, /* num_regsets */
+ NULL, /* disabled_regsets */
+ };
+
+/* Definition of linux_target_ops data member "regs_info". */
+static struct regs_info loongarch_regs =
+ {
+ NULL, /* regset_bitmap */
+ NULL, /* usrregs */
+ &loongarch_regsets_info,
+ };
+
+/* Implementation of linux target ops method "get_regs_info". */
+
+const regs_info *
+loongarch_target::get_regs_info ()
+{
+ return &loongarch_regs;
+}
+
+/* Implementation of linux target ops method "low_fetch_register". */
+
+bool
+loongarch_target::low_fetch_register (regcache *regcache, int regno)
+{
+ const struct target_desc *tdesc = regcache->tdesc;
+
+ if (regno != find_regno (tdesc, "r0"))
+ return false;
+ supply_register_zeroed (regcache, regno);
+ return true;
+}
+
+bool
+loongarch_target::low_supports_breakpoints ()
+{
+ return true;
+}
+
+/* Implementation of linux target ops method "low_get_pc". */
+
+CORE_ADDR
+loongarch_target::low_get_pc (regcache *regcache)
+{
+ if (register_size (regcache->tdesc, 0) == 8)
+ return linux_get_pc_64bit (regcache);
+ else
+ return linux_get_pc_32bit (regcache);
+}
+
+/* Implementation of linux target ops method "low_set_pc". */
+
+void
+loongarch_target::low_set_pc (regcache *regcache, CORE_ADDR newpc)
+{
+ if (register_size (regcache->tdesc, 0) == 8)
+ linux_set_pc_64bit (regcache, newpc);
+ else
+ linux_set_pc_32bit (regcache, newpc);
+}
+
+#define loongarch_breakpoint_len 4
+
+/* LoongArch BRK software debug mode instruction.
+ This instruction needs to match gdb/loongarch-tdep.c
+ (loongarch_default_breakpoint). */
+static const gdb_byte loongarch_breakpoint[] = {0x05, 0x00, 0x2a, 0x00};
+
+/* Implementation of target ops method "breakpoint_kind_from_pc". */
+
+int
+loongarch_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr)
+{
+ return loongarch_breakpoint_len;
+}
+
+/* Implementation of target ops method "sw_breakpoint_from_kind". */
+
+const gdb_byte *
+loongarch_target::sw_breakpoint_from_kind (int kind, int *size)
+{
+ *size = loongarch_breakpoint_len;
+ return (const gdb_byte *) &loongarch_breakpoint;
+}
+
+/* Implementation of linux target ops method "low_breakpoint_at". */
+
+bool
+loongarch_target::low_breakpoint_at (CORE_ADDR pc)
+{
+ gdb_byte insn[loongarch_breakpoint_len];
+
+ read_memory (pc, (unsigned char *) &insn, loongarch_breakpoint_len);
+ if (memcmp (insn, loongarch_breakpoint, loongarch_breakpoint_len) == 0)
+ return true;
+
+ return false;
+}
+
+/* The linux target ops object. */
+
+linux_process_target *the_linux_target = &the_loongarch_target;
+
+/* Initialize the LoongArch/Linux target. */
+
+void
+initialize_low_arch ()
+{
+ initialize_regsets_info (&loongarch_regsets_info);
+}