| /* GNU/Linux/m68k specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995-2016 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" |
| |
| /* 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 |
| }; |
| |
| static int |
| m68k_cannot_store_register (int regno) |
| { |
| return (regno >= m68k_num_regs); |
| } |
| |
| static int |
| m68k_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 linux_target_ops method "sw_breakpoint_from_kind". */ |
| |
| static const gdb_byte * |
| m68k_sw_breakpoint_from_kind (int kind, int *size) |
| { |
| *size = m68k_breakpoint_len; |
| return m68k_breakpoint; |
| } |
| |
| static int |
| m68k_breakpoint_at (CORE_ADDR pc) |
| { |
| unsigned char c[2]; |
| |
| read_inferior_memory (pc, c, 2); |
| if (c[0] == 0x4E && c[1] == 0x4F) |
| return 1; |
| |
| return 0; |
| } |
| |
| #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 (const 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 regs_info = |
| { |
| NULL, /* regset_bitmap */ |
| &m68k_usrregs_info, |
| &m68k_regsets_info |
| }; |
| |
| static const struct regs_info * |
| m68k_regs_info (void) |
| { |
| return ®s_info; |
| } |
| |
| static void |
| m68k_arch_setup (void) |
| { |
| current_process ()->tdesc = tdesc_m68k; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| m68k_arch_setup, |
| m68k_regs_info, |
| m68k_cannot_fetch_register, |
| m68k_cannot_store_register, |
| NULL, /* fetch_register */ |
| linux_get_pc_32bit, |
| linux_set_pc_32bit, |
| NULL, /* breakpoint_kind_from_pc */ |
| m68k_sw_breakpoint_from_kind, |
| NULL, |
| 2, |
| m68k_breakpoint_at, |
| }; |
| |
| void |
| initialize_low_arch (void) |
| { |
| /* Initialize the Linux target descriptions. */ |
| init_registers_m68k (); |
| |
| initialize_regsets_info (&m68k_regsets_info); |
| } |