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https://sourceware.org/git/binutils-gdb.git
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4933265c3f
This patch adds gdbserver support for OpenRISC. This has been used for debugging the glibc port that in being worked on here: https://github.com/openrisc/or1k-glibc/tree/or1k-port-2 Hence the comment about registers definitions being inline with glibc.
267 lines
6.2 KiB
C++
267 lines
6.2 KiB
C++
/* GNU/Linux/OR1K specific low level interface for the GDB server.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "linux-low.h"
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#include "elf/common.h"
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#include "nat/gdb_ptrace.h"
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#include <endian.h>
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#include "gdb_proc_service.h"
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#include <asm/ptrace.h>
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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/* Linux target op definitions for the OpenRISC architecture. */
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class or1k_target : public linux_process_target
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{
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public:
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const regs_info *get_regs_info () override;
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const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
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protected:
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void low_arch_setup () override;
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bool low_cannot_fetch_register (int regno) override;
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bool low_cannot_store_register (int regno) override;
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bool low_supports_breakpoints () override;
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CORE_ADDR low_get_pc (regcache *regcache) override;
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void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
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bool low_breakpoint_at (CORE_ADDR pc) override;
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};
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/* The singleton target ops object. */
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static or1k_target the_or1k_target;
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bool
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or1k_target::low_supports_breakpoints ()
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{
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return true;
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}
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CORE_ADDR
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or1k_target::low_get_pc (regcache *regcache)
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{
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return linux_get_pc_32bit (regcache);
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}
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void
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or1k_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
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{
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linux_set_pc_32bit (regcache, pc);
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}
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/* The following definition must agree with the number of registers
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defined in "struct user_regs" in GLIBC
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(sysdeps/unix/sysv/linux/or1k/sys/ucontext.h), and also with
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OR1K_NUM_REGS in GDB proper. */
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#define or1k_num_regs 35
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/* Defined in auto-generated file or1k-linux.c. */
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void init_registers_or1k_linux (void);
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extern const struct target_desc *tdesc_or1k_linux;
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/* This union is used to convert between int and byte buffer
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representations of register contents. */
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union or1k_register
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{
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unsigned char buf[4];
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int reg32;
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};
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/* Return the ptrace ``address'' of register REGNO. */
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static int or1k_regmap[] = {
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-1, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31,
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-1, /* PC */
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-1, /* ORIGINAL R11 */
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-1 /* SYSCALL NO */
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};
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/* Implement the low_arch_setup linux target ops method. */
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void
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or1k_target::low_arch_setup ()
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{
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current_process ()->tdesc = tdesc_or1k_linux;
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}
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/* Implement the low_cannot_fetch_register linux target ops method. */
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bool
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or1k_target::low_cannot_fetch_register (int regno)
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{
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return (or1k_regmap[regno] == -1);
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}
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/* Implement the low_cannot_store_register linux target ops method. */
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bool
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or1k_target::low_cannot_store_register (int regno)
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{
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return (or1k_regmap[regno] == -1);
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}
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/* Breakpoint support. */
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static const unsigned int or1k_breakpoint = 0x21000001;
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#define or1k_breakpoint_len 4
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/* Implementation of target ops method "sw_breakpoint_from_kind". */
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const gdb_byte *
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or1k_target::sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = or1k_breakpoint_len;
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return (const gdb_byte *) &or1k_breakpoint;
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}
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/* Implement the low_breakpoint_at linux target ops method. */
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bool
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or1k_target::low_breakpoint_at (CORE_ADDR where)
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{
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unsigned int insn;
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read_memory (where, (unsigned char *) &insn, or1k_breakpoint_len);
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if (insn == or1k_breakpoint)
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return true;
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return false;
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}
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *) *base - idx);
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return PS_OK;
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}
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/* Helper functions to collect/supply a single register REGNO. */
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static void
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or1k_collect_register (struct regcache *regcache, int regno,
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union or1k_register *reg)
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{
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union or1k_register tmp_reg;
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collect_register (regcache, regno, &tmp_reg.reg32);
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reg->reg32 = tmp_reg.reg32;
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}
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static void
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or1k_supply_register (struct regcache *regcache, int regno,
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const union or1k_register *reg)
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{
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supply_register (regcache, regno, reg->buf);
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}
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/* We have only a single register set on OpenRISC. */
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static void
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or1k_fill_gregset (struct regcache *regcache, void *buf)
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{
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union or1k_register *regset = (union or1k_register *) buf;
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int i;
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for (i = 1; i < or1k_num_regs; i++)
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or1k_collect_register (regcache, i, regset + i);
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}
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static void
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or1k_store_gregset (struct regcache *regcache, const void *buf)
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{
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const union or1k_register *regset = (union or1k_register *) buf;
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int i;
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for (i = 0; i < or1k_num_regs; i++)
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or1k_supply_register (regcache, i, regset + i);
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}
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static struct regset_info or1k_regsets[] =
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{
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
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or1k_num_regs * 4, GENERAL_REGS,
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or1k_fill_gregset, or1k_store_gregset },
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NULL_REGSET
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};
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static struct regsets_info or1k_regsets_info =
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{
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or1k_regsets, /* regsets */
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0, /* num_regsets */
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NULL, /* disabled_regsets */
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};
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static struct usrregs_info or1k_usrregs_info =
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{
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or1k_num_regs,
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or1k_regmap,
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};
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static struct regs_info or1k_regs =
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{
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NULL, /* regset_bitmap */
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&or1k_usrregs_info,
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&or1k_regsets_info
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};
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const regs_info *
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or1k_target::get_regs_info ()
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{
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return &or1k_regs;
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}
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/* The linux target ops object. */
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linux_process_target *the_linux_target = &the_or1k_target;
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void
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initialize_low_arch (void)
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{
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init_registers_or1k_linux ();
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initialize_regsets_info (&or1k_regsets_info);
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}
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