From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: gdb-patches@sourceware.org
Cc: Xuefeng Li <lixuefeng@loongson.cn>,
Chenghua Xu <xuchenghua@loongson.cn>,
Zhensong Liu <liuzhensong@loongson.cn>,
Qing zhang <zhangqing@loongson.cn>,
Youling Tang <tangyouling@loongson.cn>,
Tiezhu Yang <yangtiezhu@loongson.cn>
Subject: [PATCH 4/6] gdb: LoongArch: Add initial native linux support
Date: Thu, 9 Dec 2021 19:35:59 +0800 [thread overview]
Message-ID: <1639049761-5616-5-git-send-email-yangtiezhu@loongson.cn> (raw)
In-Reply-To: <1639049761-5616-1-git-send-email-yangtiezhu@loongson.cn>
This commit adds initial native linux 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/loongarch-linux-nat.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 175 insertions(+)
create mode 100644 gdb/loongarch-linux-nat.c
diff --git a/gdb/loongarch-linux-nat.c b/gdb/loongarch-linux-nat.c
new file mode 100644
index 0000000..b35c3e2
--- /dev/null
+++ b/gdb/loongarch-linux-nat.c
@@ -0,0 +1,175 @@
+/* Target-dependent code for GNU/Linux LoongArch.
+
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ Contributed by Loongson Ltd.
+
+ 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 "defs.h"
+#include "elf/common.h"
+#include "gregset.h"
+#include "inferior.h"
+#include "linux-nat-trad.h"
+#include "loongarch-tdep.h"
+#include "nat/gdb_ptrace.h"
+#include "target-descriptions.h"
+
+#include <asm/ptrace.h>
+
+/* LoongArch Linux native additions to the default linux support. */
+
+class loongarch_linux_nat_target final : public linux_nat_trad_target
+{
+public:
+ /* Add our register access methods. */
+ void fetch_registers (struct regcache *, int) override;
+ void store_registers (struct regcache *, int) override;
+
+protected:
+ /* Override linux_nat_trad_target methods. */
+ CORE_ADDR register_u_offset (struct gdbarch *gdbarch, int regno,
+ int store_p) override;
+};
+
+/* Fill GDB's register array with the general-purpose, pc and badvaddr
+ register values from the current thread. */
+
+static void
+fetch_gregs_from_thread (struct regcache *regcache, int regno, pid_t tid)
+{
+ loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
+ auto regs = tdep->regs;
+ elf_gregset_t regset;
+
+ if ((regno == -1) || (regs.r <= regno && regno < regs.r + 32) ||
+ (regs.pc == regno) || (regs.badvaddr == regno))
+ {
+ struct iovec iovec = { .iov_base = ®set, .iov_len = sizeof (regset) };
+
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iovec) < 0)
+ perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
+ else
+ loongarch_elf_gregset.supply_regset (NULL, regcache, regno, ®set,
+ sizeof (regset));
+ }
+}
+
+/* Store to the current thread the valid general-purpose, pc and badvaddr
+ register values in the GDB's register array. */
+
+static void
+store_gregs_to_thread (struct regcache *regcache, int regno, pid_t tid)
+{
+ loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
+ auto regs = tdep->regs;
+ elf_gregset_t regset;
+
+ if ((regno == -1) || (regs.r <= regno && regno < regs.r + 32) ||
+ (regs.pc == regno) || (regs.badvaddr == regno))
+ {
+ struct iovec iovec = { .iov_base = ®set, .iov_len = sizeof (regset) };
+
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iovec) < 0)
+ perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
+ else
+ {
+ loongarch_elf_gregset.collect_regset (NULL, regcache, regno, ®set,
+ sizeof (regset));
+ if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, (long) &iovec) < 0)
+ perror_with_name (_("Couldn't set NT_PRSTATUS registers"));
+ }
+ }
+}
+
+/* Implement the "fetch_registers" target_ops method. */
+
+void
+loongarch_linux_nat_target::fetch_registers (struct regcache *regcache,
+ int regno)
+{
+ pid_t tid = get_ptrace_pid (regcache->ptid ());
+
+ fetch_gregs_from_thread(regcache, regno, tid);
+}
+
+/* Implement the "store_registers" target_ops method. */
+
+void
+loongarch_linux_nat_target::store_registers (struct regcache *regcache,
+ int regno)
+{
+ pid_t tid = get_ptrace_pid (regcache->ptid ());
+
+ store_gregs_to_thread(regcache, regno, tid);
+}
+
+/* Return the address in the core dump or inferior of register REGNO. */
+
+CORE_ADDR
+loongarch_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
+ int regno, int store_p)
+{
+ loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (gdbarch);
+ auto regs = tdep->regs;
+
+ /* according to <asm/ptrace.h> */
+ if (0 <= regs.r && regs.r <= regno && regno < regs.r + GPR_NUM)
+ return GPR_BASE + regno - regs.r;
+ else if (regs.pc == regno)
+ return PC;
+ else
+ return -1;
+}
+
+static loongarch_linux_nat_target the_loongarch_linux_nat_target;
+
+/* Wrapper functions. These are only used by libthread_db. */
+
+void
+supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregset)
+{
+ loongarch_elf_gregset.supply_regset (NULL, regcache, -1, gregset,
+ sizeof (gdb_gregset_t));
+}
+
+void
+fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregset,
+ int regno)
+{
+ loongarch_elf_gregset.collect_regset (NULL, regcache, regno, gregset,
+ sizeof (gdb_gregset_t));
+}
+
+void
+supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregset)
+{
+}
+
+void
+fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregset,
+ int regno)
+{
+}
+
+/* Initialize LoongArch Linux native support. */
+
+void _initialize_loongarch_linux_nat ();
+void
+_initialize_loongarch_linux_nat ()
+{
+ linux_target = &the_loongarch_linux_nat_target;
+ add_inf_child_target (&the_loongarch_linux_nat_target);
+}
--
2.1.0
next prev parent reply other threads:[~2021-12-09 11:36 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 11:35 [PATCH 0/6] gdb: Add basic support for LoongArch Tiezhu Yang
2021-12-09 11:35 ` [PATCH 1/6] gdb: LoongArch: Add initial target description support Tiezhu Yang
2022-01-06 21:19 ` Tom Tromey
2022-01-10 14:04 ` Andrew Burgess
2022-01-11 23:14 ` Tiezhu Yang
2021-12-09 11:35 ` [PATCH 2/6] gdb: LoongArch: Add initial baremetal support Tiezhu Yang
2022-01-06 21:27 ` Tom Tromey
2022-01-10 14:28 ` Andrew Burgess
2021-12-09 11:35 ` [PATCH 3/6] gdb: LoongArch: Add initial linux target support Tiezhu Yang
2022-01-06 21:31 ` Tom Tromey
2022-01-10 14:34 ` Andrew Burgess
2021-12-09 11:35 ` Tiezhu Yang [this message]
2022-01-06 21:36 ` [PATCH 4/6] gdb: LoongArch: Add initial native linux support Tom Tromey
2022-01-10 14:38 ` Andrew Burgess
2021-12-09 11:36 ` [PATCH 5/6] gdb: LoongArch: Add Makefile and configure Tiezhu Yang
2022-01-06 21:39 ` Tom Tromey
2022-01-10 12:06 ` Andrew Burgess
2021-12-09 11:36 ` [PATCH 6/6] gdb: LoongArch: Update ChangeLog and NEWS Tiezhu Yang
2022-01-06 21:40 ` Tom Tromey
2021-12-15 8:36 ` [PATCH 0/6] gdb: Add basic support for LoongArch Tiezhu Yang
2022-01-06 21:41 ` Tom Tromey
2022-01-07 12:41 ` Tiezhu Yang
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