From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by sourceware.org (Postfix) with ESMTP id 46C253858421 for ; Thu, 20 Jan 2022 00:50:26 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 46C253858421 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=loongson.cn Received: from localhost.localdomain (unknown [111.18.94.40]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9AxuuDIsehhEaoBAA--.6238S6; Thu, 20 Jan 2022 08:50:25 +0800 (CST) From: Tiezhu Yang To: gdb-patches@sourceware.org, Tom Tromey , Andrew Burgess Subject: [PATCH v2 4/5] gdb: LoongArch: Add initial native Linux support Date: Thu, 20 Jan 2022 08:50:10 +0800 Message-Id: <20220120005011.4531-5-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220120005011.4531-1-yangtiezhu@loongson.cn> References: <20220120005011.4531-1-yangtiezhu@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: AQAAf9AxuuDIsehhEaoBAA--.6238S6 X-Coremail-Antispam: 1UD129KBjvJXoW3WF18Xw1xKw1rGFWrZw4DCFg_yoW7tw45pa yUu345Jr48JrsIyrWDJF15Z3Z8C3s3WFW2vryfta4SkwnxG348XFWktry7ZF15J34UCr4a gF42va1UuFZ5AFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9qb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI 8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK0II2c7xJM28C jxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI 8IcVCY1x0267AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2 jsIEc7CjxVAFwI0_Cr1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64 kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm 72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I 0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWU GVWUWwC2zVAF1VAY17CE14v26r1Y6r17MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI 0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0 rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r 4UJbIYCTnIWIevJa73UjIFyTuYvjxUyL05UUUUU X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_SHORT, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jan 2022 00:50:29 -0000 This commit adds initial native Linux support for LoongArch. Signed-off-by: Tiezhu Yang --- gdb/loongarch-linux-nat.c | 184 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 184 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 00000000000..edc3d697d7b --- /dev/null +++ b/gdb/loongarch-linux-nat.c @@ -0,0 +1,184 @@ +/* Native-dependent code for GNU/Linux on LoongArch processors. + + Copyright (C) 2022 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 . */ + +#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 + +/* 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 badv + 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.badv == regno) + { + struct iovec iov; + + iov.iov_base = ®set; + iov.iov_len = sizeof (regset); + + if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0) + perror_with_name (_("Couldn't get NT_PRSTATUS registers")); + else + loongarch_gregset.supply_regset (nullptr, regcache, regno, + ®set, sizeof (regset)); + } +} + +/* Store to the current thread the valid general-purpose, pc and badv + 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.badv == regno) + { + struct iovec iov; + + iov.iov_base = ®set; + iov.iov_len = sizeof (regset); + + if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0) + perror_with_name (_("Couldn't get NT_PRSTATUS registers")); + else + { + loongarch_gregset.collect_regset (nullptr, regcache, regno, + ®set, sizeof (regset)); + if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, (long) &iov) < 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 */ + 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_gregset.supply_regset (nullptr, regcache, -1, gregset, + sizeof (gdb_gregset_t)); +} + +void +fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregset, + int regno) +{ + loongarch_gregset.collect_regset (nullptr, 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); +} -- 2.27.0