| /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995-2015 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 <sys/ptrace.h> |
| |
| /* Defined in auto-generated file reg-cris.c. */ |
| void init_registers_cris (void); |
| extern const struct target_desc *tdesc_cris; |
| |
| /* CRISv10 */ |
| #define cris_num_regs 32 |
| |
| /* Locations need to match <include/asm/arch/ptrace.h>. */ |
| static int cris_regmap[] = { |
| 15*4, 14*4, 13*4, 12*4, |
| 11*4, 10*4, 9*4, 8*4, |
| 7*4, 6*4, 5*4, 4*4, |
| 3*4, 2*4, 23*4, 19*4, |
| |
| -1, -1, -1, -1, |
| -1, 17*4, -1, 16*4, |
| -1, -1, -1, 18*4, |
| -1, 17*4, -1, -1 |
| |
| }; |
| |
| static int |
| cris_cannot_store_register (int regno) |
| { |
| if (cris_regmap[regno] == -1) |
| return 1; |
| |
| return (regno >= cris_num_regs); |
| } |
| |
| static int |
| cris_cannot_fetch_register (int regno) |
| { |
| if (cris_regmap[regno] == -1) |
| return 1; |
| |
| return (regno >= cris_num_regs); |
| } |
| |
| extern int debug_threads; |
| |
| static CORE_ADDR |
| cris_get_pc (struct regcache *regcache, void) |
| { |
| unsigned long pc; |
| collect_register_by_name (regcache, "pc", &pc); |
| if (debug_threads) |
| debug_printf ("stop pc is %08lx\n", pc); |
| return pc; |
| } |
| |
| static void |
| cris_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name (regcache, "pc", &newpc); |
| } |
| |
| static const unsigned short cris_breakpoint = 0xe938; |
| #define cris_breakpoint_len 2 |
| |
| static int |
| cris_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned short insn; |
| |
| (*the_target->read_memory) (where, (unsigned char *) &insn, |
| cris_breakpoint_len); |
| if (insn == cris_breakpoint) |
| return 1; |
| |
| /* If necessary, recognize more trap instructions here. GDB only uses the |
| one. */ |
| return 0; |
| } |
| |
| /* We only place breakpoints in empty marker functions, and thread locking |
| is outside of the function. So rather than importing software single-step, |
| we can just run until exit. */ |
| static CORE_ADDR |
| cris_reinsert_addr (void) |
| { |
| struct regcache *regcache = get_thread_regcache (current_thread, 1); |
| unsigned long pc; |
| collect_register_by_name (regcache, "srp", &pc); |
| return pc; |
| } |
| |
| static void |
| cris_arch_setup (void) |
| { |
| current_process ()->tdesc = tdesc_cris; |
| } |
| |
| static struct usrregs_info cris_usrregs_info = |
| { |
| cris_num_regs, |
| cris_regmap, |
| }; |
| |
| static struct regs_info regs_info = |
| { |
| NULL, /* regset_bitmap */ |
| &cris_usrregs_info, |
| }; |
| |
| static const struct regs_info * |
| cris_regs_info (void) |
| { |
| return ®s_info; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| cris_arch_setup, |
| cris_regs_info, |
| cris_cannot_fetch_register, |
| cris_cannot_store_register, |
| NULL, /* fetch_register */ |
| cris_get_pc, |
| cris_set_pc, |
| (const unsigned char *) &cris_breakpoint, |
| cris_breakpoint_len, |
| cris_reinsert_addr, |
| 0, |
| cris_breakpoint_at, |
| 0, |
| 0, |
| 0, |
| 0, |
| }; |
| |
| void |
| initialize_low_arch (void) |
| { |
| init_registers_cris (); |
| } |