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- /* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
- Copyright (C) 1995-2022 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"
- /* Linux target op definitions for the m68k architecture. */
- class m68k_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;
- int low_decr_pc_after_break () override;
- bool low_breakpoint_at (CORE_ADDR pc) override;
- };
- /* The singleton target ops object. */
- static m68k_target the_m68k_target;
- bool
- m68k_target::low_supports_breakpoints ()
- {
- return true;
- }
- CORE_ADDR
- m68k_target::low_get_pc (regcache *regcache)
- {
- return linux_get_pc_32bit (regcache);
- }
- void
- m68k_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
- {
- linux_set_pc_32bit (regcache, pc);
- }
- int
- m68k_target::low_decr_pc_after_break ()
- {
- return 2;
- }
- /* Defined in auto-generated file reg-m68k.c. */
- void init_registers_m68k (void);
- extern const struct target_desc *tdesc_m68k;
- #ifdef HAVE_SYS_REG_H
- #include <sys/reg.h>
- #endif
- #define m68k_num_regs 29
- #define m68k_num_gregs 18
- /* This table must line up with REGISTER_NAMES in tm-m68k.h */
- static int m68k_regmap[] =
- {
- #ifdef PT_D0
- PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4,
- PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4,
- PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4,
- PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4,
- PT_SR * 4, PT_PC * 4,
- #else
- 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
- 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
- 17 * 4, 18 * 4,
- #endif
- #ifdef PT_FP0
- PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4,
- PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4,
- PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4
- #else
- 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
- 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
- #endif
- };
- bool
- m68k_target::low_cannot_store_register (int regno)
- {
- return (regno >= m68k_num_regs);
- }
- bool
- m68k_target::low_cannot_fetch_register (int regno)
- {
- return (regno >= m68k_num_regs);
- }
- #ifdef HAVE_PTRACE_GETREGS
- #include <sys/procfs.h>
- #include "nat/gdb_ptrace.h"
- static void
- m68k_fill_gregset (struct regcache *regcache, void *buf)
- {
- int i;
- for (i = 0; i < m68k_num_gregs; i++)
- collect_register (regcache, i, (char *) buf + m68k_regmap[i]);
- }
- static void
- m68k_store_gregset (struct regcache *regcache, const void *buf)
- {
- int i;
- for (i = 0; i < m68k_num_gregs; i++)
- supply_register (regcache, i, (const char *) buf + m68k_regmap[i]);
- }
- static void
- m68k_fill_fpregset (struct regcache *regcache, void *buf)
- {
- int i;
- for (i = m68k_num_gregs; i < m68k_num_regs; i++)
- collect_register (regcache, i, ((char *) buf
- + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
- }
- static void
- m68k_store_fpregset (struct regcache *regcache, const void *buf)
- {
- int i;
- for (i = m68k_num_gregs; i < m68k_num_regs; i++)
- supply_register (regcache, i, ((const char *) buf
- + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
- }
- #endif /* HAVE_PTRACE_GETREGS */
- static struct regset_info m68k_regsets[] = {
- #ifdef HAVE_PTRACE_GETREGS
- { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
- GENERAL_REGS,
- m68k_fill_gregset, m68k_store_gregset },
- { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t),
- FP_REGS,
- m68k_fill_fpregset, m68k_store_fpregset },
- #endif /* HAVE_PTRACE_GETREGS */
- NULL_REGSET
- };
- static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F };
- #define m68k_breakpoint_len 2
- /* Implementation of target ops method "sw_breakpoint_from_kind". */
- const gdb_byte *
- m68k_target::sw_breakpoint_from_kind (int kind, int *size)
- {
- *size = m68k_breakpoint_len;
- return m68k_breakpoint;
- }
- bool
- m68k_target::low_breakpoint_at (CORE_ADDR pc)
- {
- unsigned char c[2];
- read_inferior_memory (pc, c, 2);
- if (c[0] == 0x4E && c[1] == 0x4F)
- return true;
- return false;
- }
- #include <asm/ptrace.h>
- #ifdef PTRACE_GET_THREAD_AREA
- /* 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;
- }
- #endif /* PTRACE_GET_THREAD_AREA */
- static struct regsets_info m68k_regsets_info =
- {
- m68k_regsets, /* regsets */
- 0, /* num_regsets */
- NULL, /* disabled_regsets */
- };
- static struct usrregs_info m68k_usrregs_info =
- {
- m68k_num_regs,
- m68k_regmap,
- };
- static struct regs_info myregs_info =
- {
- NULL, /* regset_bitmap */
- &m68k_usrregs_info,
- &m68k_regsets_info
- };
- const regs_info *
- m68k_target::get_regs_info ()
- {
- return &myregs_info;
- }
- void
- m68k_target::low_arch_setup ()
- {
- current_process ()->tdesc = tdesc_m68k;
- }
- /* The linux target ops object. */
- linux_process_target *the_linux_target = &the_m68k_target;
- void
- initialize_low_arch (void)
- {
- /* Initialize the Linux target descriptions. */
- init_registers_m68k ();
- initialize_regsets_info (&m68k_regsets_info);
- }
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