--- /dev/null
+/* GNU/Linux/OR1K specific low level interface for the GDB server.
+ Copyright (C) 2021 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 "elf/common.h"
+#include "nat/gdb_ptrace.h"
+#include <endian.h>
+#include "gdb_proc_service.h"
+#include <asm/ptrace.h>
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+
+/* Linux target op definitions for the OpenRISC architecture. */
+
+class or1k_target : public linux_process_target
+{
+public:
+
+ const regs_info *get_regs_info () 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_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 or1k_target the_or1k_target;
+
+bool
+or1k_target::low_supports_breakpoints ()
+{
+ return true;
+}
+
+CORE_ADDR
+or1k_target::low_get_pc (regcache *regcache)
+{
+ return linux_get_pc_32bit (regcache);
+}
+
+void
+or1k_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
+{
+ linux_set_pc_32bit (regcache, pc);
+}
+
+/* The following definition must agree with the number of registers
+ defined in "struct user_regs" in GLIBC
+ (sysdeps/unix/sysv/linux/or1k/sys/ucontext.h), and also with
+ OR1K_NUM_REGS in GDB proper. */
+
+#define or1k_num_regs 35
+
+/* Defined in auto-generated file or1k-linux.c. */
+
+void init_registers_or1k_linux (void);
+extern const struct target_desc *tdesc_or1k_linux;
+
+/* This union is used to convert between int and byte buffer
+ representations of register contents. */
+
+union or1k_register
+{
+ unsigned char buf[4];
+ int reg32;
+};
+
+/* Return the ptrace ``address'' of register REGNO. */
+
+static int or1k_regmap[] = {
+ -1, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+ -1, /* PC */
+ -1, /* ORIGINAL R11 */
+ -1 /* SYSCALL NO */
+};
+
+/* Implement the low_arch_setup linux target ops method. */
+
+void
+or1k_target::low_arch_setup ()
+{
+ current_process ()->tdesc = tdesc_or1k_linux;
+}
+
+/* Implement the low_cannot_fetch_register linux target ops method. */
+
+bool
+or1k_target::low_cannot_fetch_register (int regno)
+{
+ return (or1k_regmap[regno] == -1);
+}
+
+/* Implement the low_cannot_store_register linux target ops method. */
+
+bool
+or1k_target::low_cannot_store_register (int regno)
+{
+ return (or1k_regmap[regno] == -1);
+}
+
+/* Breakpoint support. */
+
+static const unsigned int or1k_breakpoint = 0x21000001;
+#define or1k_breakpoint_len 4
+
+/* Implementation of target ops method "sw_breakpoint_from_kind". */
+
+const gdb_byte *
+or1k_target::sw_breakpoint_from_kind (int kind, int *size)
+{
+ *size = or1k_breakpoint_len;
+ return (const gdb_byte *) &or1k_breakpoint;
+}
+
+/* Implement the low_breakpoint_at linux target ops method. */
+
+bool
+or1k_target::low_breakpoint_at (CORE_ADDR where)
+{
+ unsigned int insn;
+
+ read_memory (where, (unsigned char *) &insn, or1k_breakpoint_len);
+ if (insn == or1k_breakpoint)
+ return true;
+ return false;
+}
+
+/* Fetch the thread-local storage pointer for libthread_db. */
+
+ps_err_e
+ps_get_thread_area (struct ps_prochandle *ph,
+ lwpid_t lwpid, int idx, void **base)
+{
+ if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
+ return PS_ERR;
+
+ /* IDX is the bias from the thread pointer to the beginning of the
+ thread descriptor. It has to be subtracted due to implementation
+ quirks in libthread_db. */
+ *base = (void *) ((char *) *base - idx);
+
+ return PS_OK;
+}
+
+/* Helper functions to collect/supply a single register REGNO. */
+
+static void
+or1k_collect_register (struct regcache *regcache, int regno,
+ union or1k_register *reg)
+{
+ union or1k_register tmp_reg;
+
+ collect_register (regcache, regno, &tmp_reg.reg32);
+ reg->reg32 = tmp_reg.reg32;
+}
+
+static void
+or1k_supply_register (struct regcache *regcache, int regno,
+ const union or1k_register *reg)
+{
+ supply_register (regcache, regno, reg->buf);
+}
+
+/* We have only a single register set on OpenRISC. */
+
+static void
+or1k_fill_gregset (struct regcache *regcache, void *buf)
+{
+ union or1k_register *regset = (union or1k_register *) buf;
+ int i;
+
+ for (i = 1; i < or1k_num_regs; i++)
+ or1k_collect_register (regcache, i, regset + i);
+}
+
+static void
+or1k_store_gregset (struct regcache *regcache, const void *buf)
+{
+ const union or1k_register *regset = (union or1k_register *) buf;
+ int i;
+
+ for (i = 0; i < or1k_num_regs; i++)
+ or1k_supply_register (regcache, i, regset + i);
+}
+
+static struct regset_info or1k_regsets[] =
+{
+ { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
+ or1k_num_regs * 4, GENERAL_REGS,
+ or1k_fill_gregset, or1k_store_gregset },
+ NULL_REGSET
+};
+
+static struct regsets_info or1k_regsets_info =
+ {
+ or1k_regsets, /* regsets */
+ 0, /* num_regsets */
+ NULL, /* disabled_regsets */
+ };
+
+static struct usrregs_info or1k_usrregs_info =
+ {
+ or1k_num_regs,
+ or1k_regmap,
+ };
+
+static struct regs_info or1k_regs =
+ {
+ NULL, /* regset_bitmap */
+ &or1k_usrregs_info,
+ &or1k_regsets_info
+ };
+
+const regs_info *
+or1k_target::get_regs_info ()
+{
+ return &or1k_regs;
+}
+
+/* The linux target ops object. */
+
+linux_process_target *the_linux_target = &the_or1k_target;
+
+void
+initialize_low_arch (void)
+{
+ init_registers_or1k_linux ();
+
+ initialize_regsets_info (&or1k_regsets_info);
+}
projects / binutils-gdb.git / commitdiff