| /* GNU/Linux/i386 specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, |
| 2007, 2008 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 "i387-fp.h" |
| |
| #include "gdb_proc_service.h" |
| |
| #include <sys/ptrace.h> |
| |
| #ifdef HAVE_SYS_REG_H |
| #include <sys/reg.h> |
| #endif |
| |
| #ifndef PTRACE_GET_THREAD_AREA |
| #define PTRACE_GET_THREAD_AREA 25 |
| #endif |
| |
| /* Defined in auto-generated file reg-i386-linux.c. */ |
| void init_registers_i386_linux (void); |
| |
| |
| /* This module only supports access to the general purpose registers. */ |
| |
| #define i386_num_regs 16 |
| |
| /* This stuff comes from i386-linux-nat.c. */ |
| |
| /* Mapping between the general-purpose registers in `struct user' |
| format and GDB's register array layout. */ |
| static int i386_regmap[] = |
| { |
| EAX * 4, ECX * 4, EDX * 4, EBX * 4, |
| UESP * 4, EBP * 4, ESI * 4, EDI * 4, |
| EIP * 4, EFL * 4, CS * 4, SS * 4, |
| DS * 4, ES * 4, FS * 4, GS * 4 |
| }; |
| |
| /* Called by libthread_db. */ |
| |
| ps_err_e |
| ps_get_thread_area (const struct ps_prochandle *ph, |
| lwpid_t lwpid, int idx, void **base) |
| { |
| unsigned int desc[4]; |
| |
| if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, |
| (void *) idx, (unsigned long) &desc) < 0) |
| return PS_ERR; |
| |
| *(int *)base = desc[1]; |
| return PS_OK; |
| } |
| |
| static int |
| i386_cannot_store_register (int regno) |
| { |
| return (regno >= i386_num_regs); |
| } |
| |
| static int |
| i386_cannot_fetch_register (int regno) |
| { |
| return (regno >= i386_num_regs); |
| } |
| |
| |
| #ifdef HAVE_PTRACE_GETREGS |
| #include <sys/procfs.h> |
| #include <sys/ptrace.h> |
| |
| static void |
| i386_fill_gregset (void *buf) |
| { |
| int i; |
| |
| for (i = 0; i < i386_num_regs; i++) |
| collect_register (i, ((char *) buf) + i386_regmap[i]); |
| |
| collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); |
| } |
| |
| static void |
| i386_store_gregset (const void *buf) |
| { |
| int i; |
| |
| for (i = 0; i < i386_num_regs; i++) |
| supply_register (i, ((char *) buf) + i386_regmap[i]); |
| |
| supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); |
| } |
| |
| static void |
| i386_fill_fpregset (void *buf) |
| { |
| i387_cache_to_fsave (buf); |
| } |
| |
| static void |
| i386_store_fpregset (const void *buf) |
| { |
| i387_fsave_to_cache (buf); |
| } |
| |
| static void |
| i386_fill_fpxregset (void *buf) |
| { |
| i387_cache_to_fxsave (buf); |
| } |
| |
| static void |
| i386_store_fpxregset (const void *buf) |
| { |
| i387_fxsave_to_cache (buf); |
| } |
| |
| #endif /* HAVE_PTRACE_GETREGS */ |
| |
| struct regset_info target_regsets[] = { |
| #ifdef HAVE_PTRACE_GETREGS |
| { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
| GENERAL_REGS, |
| i386_fill_gregset, i386_store_gregset }, |
| # ifdef HAVE_PTRACE_GETFPXREGS |
| { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), |
| EXTENDED_REGS, |
| i386_fill_fpxregset, i386_store_fpxregset }, |
| # endif |
| { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), |
| FP_REGS, |
| i386_fill_fpregset, i386_store_fpregset }, |
| #endif /* HAVE_PTRACE_GETREGS */ |
| { 0, 0, -1, -1, NULL, NULL } |
| }; |
| |
| static const unsigned char i386_breakpoint[] = { 0xCC }; |
| #define i386_breakpoint_len 1 |
| |
| extern int debug_threads; |
| |
| static CORE_ADDR |
| i386_get_pc () |
| { |
| unsigned long pc; |
| |
| collect_register_by_name ("eip", &pc); |
| |
| if (debug_threads) |
| fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); |
| return pc; |
| } |
| |
| static void |
| i386_set_pc (CORE_ADDR newpc) |
| { |
| if (debug_threads) |
| fprintf (stderr, "set pc to %08lx\n", (long) newpc); |
| supply_register_by_name ("eip", &newpc); |
| } |
| |
| static int |
| i386_breakpoint_at (CORE_ADDR pc) |
| { |
| unsigned char c; |
| |
| read_inferior_memory (pc, &c, 1); |
| if (c == 0xCC) |
| return 1; |
| |
| return 0; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| init_registers_i386_linux, |
| i386_num_regs, |
| i386_regmap, |
| i386_cannot_fetch_register, |
| i386_cannot_store_register, |
| i386_get_pc, |
| i386_set_pc, |
| i386_breakpoint, |
| i386_breakpoint_len, |
| NULL, |
| 1, |
| i386_breakpoint_at, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| }; |