--- /dev/null
+/* 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);
+}
projects / binutils-gdb.git / commitdiff