| /* GNU/Linux/ARC specific low level interface, for the remote server for GDB. |
| Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "server.h" |
| #include "linux-low.h" |
| |
| #include <linux/user.h> |
| |
| #define OFFSET(member,structure) (int)(&( ((struct structure *)0)->member )) |
| |
| #define arc_num_regs 39 |
| |
| /* arc_regmap[i] is the offset of Ri in Linux's user struct */ |
| static int arc_regmap[] = { |
| OFFSET(r0, user_regs_struct), |
| OFFSET(r1, user_regs_struct), |
| OFFSET(r2, user_regs_struct), |
| OFFSET(r3, user_regs_struct), |
| OFFSET(r4, user_regs_struct), |
| OFFSET(r5, user_regs_struct), |
| OFFSET(r6, user_regs_struct), |
| OFFSET(r7, user_regs_struct), |
| OFFSET(r8, user_regs_struct), |
| OFFSET(r9, user_regs_struct), |
| OFFSET(r10, user_regs_struct), |
| OFFSET(r11, user_regs_struct), |
| OFFSET(r12, user_regs_struct), |
| OFFSET(r13, user_regs_struct), |
| OFFSET(r14, user_regs_struct), |
| OFFSET(r15, user_regs_struct), |
| OFFSET(r16, user_regs_struct), |
| OFFSET(r17, user_regs_struct), |
| OFFSET(r18, user_regs_struct), |
| OFFSET(r19, user_regs_struct), |
| OFFSET(r20, user_regs_struct), |
| OFFSET(r21, user_regs_struct), |
| OFFSET(r22, user_regs_struct), |
| OFFSET(r23, user_regs_struct), |
| OFFSET(r24, user_regs_struct), |
| OFFSET(r25, user_regs_struct), |
| OFFSET(r26, user_regs_struct), |
| OFFSET(bta, user_regs_struct), |
| OFFSET(lp_start, user_regs_struct), |
| OFFSET(lp_end, user_regs_struct), |
| OFFSET(lp_count, user_regs_struct), |
| OFFSET(status32, user_regs_struct), |
| OFFSET(blink, user_regs_struct), |
| OFFSET(fp, user_regs_struct), |
| OFFSET(sp, user_regs_struct), |
| OFFSET(efa, user_regs_struct), |
| OFFSET(ret, user_regs_struct), |
| OFFSET(orig_r8, user_regs_struct), |
| OFFSET(stop_pc, user_regs_struct) |
| }; |
| |
| static int |
| arc_cannot_store_register (int regno) |
| { |
| return (regno == 35 || regno >= arc_num_regs); /* FIXME, this is dirty */ |
| } |
| |
| static int |
| arc_cannot_fetch_register (int regno) |
| { |
| return (regno >= arc_num_regs); |
| } |
| |
| extern int debug_threads; |
| |
| static CORE_ADDR |
| arc_get_pc () |
| { |
| unsigned long pc; |
| collect_register_by_name ("stop_pc", &pc); |
| if (debug_threads) |
| fprintf (stderr, "stop pc is %08lx\n", pc); |
| return pc; |
| } |
| |
| static void |
| arc_set_pc (CORE_ADDR pc) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name ("ret", &newpc); |
| } |
| |
| |
| /* trap_s 1 */ |
| /* FIXME: dependent on target endianness */ |
| static const unsigned long arc_breakpoint = 0x783E; |
| #define arc_breakpoint_len 2 |
| |
| static int |
| arc_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned long insn; |
| |
| (*the_target->read_memory) (where, (unsigned char *) &insn, arc_breakpoint_len); |
| if (insn == arc_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 |
| arc_reinsert_addr () |
| { |
| unsigned long pc; |
| collect_register_by_name ("blink", &pc); |
| return pc; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| arc_num_regs, |
| arc_regmap, |
| arc_cannot_fetch_register, |
| arc_cannot_store_register, |
| arc_get_pc, |
| arc_set_pc, |
| (const unsigned char *) &arc_breakpoint, |
| arc_breakpoint_len, |
| arc_reinsert_addr, |
| 0, |
| arc_breakpoint_at, |
| }; |