/* Low level interface to i386 running the GNU Hurd. Copyright (C) 1992-2014 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 "defs.h" #include "inferior.h" #include "floatformat.h" #include "regcache.h" #include <mach.h> #include <mach_error.h> #include <mach/message.h> #include <mach/exception.h> #include "i386-tdep.h" #include "gnu-nat.h" #include "i387-tdep.h" #ifdef HAVE_SYS_PROCFS_H # include <sys/procfs.h> # include "gregset.h" #endif /* Offset to the thread_state_t location where REG is stored. */ #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) /* At REG_OFFSET[N] is the offset to the thread_state_t location where the GDB register N is stored. */ static int reg_offset[] = { REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) }; /* Offset to the greg_t location where REG is stored. */ #define CREG_OFFSET(reg) (REG_##reg * 4) /* At CREG_OFFSET[N] is the offset to the greg_t location where the GDB register N is stored. */ static int creg_offset[] = { CREG_OFFSET (EAX), CREG_OFFSET (ECX), CREG_OFFSET (EDX), CREG_OFFSET (EBX), CREG_OFFSET (UESP), CREG_OFFSET (EBP), CREG_OFFSET (ESI), CREG_OFFSET (EDI), CREG_OFFSET (EIP), CREG_OFFSET (EFL), CREG_OFFSET (CS), CREG_OFFSET (SS), CREG_OFFSET (DS), CREG_OFFSET (ES), CREG_OFFSET (FS), CREG_OFFSET (GS) }; #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum]) /* Get the whole floating-point state of THREAD and record the values of the corresponding (pseudo) registers. */ static void fetch_fpregs (struct regcache *regcache, struct proc *thread) { mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; struct i386_float_state state; error_t err; err = thread_get_state (thread->port, i386_FLOAT_STATE, (thread_state_t) &state, &count); if (err) { warning (_("Couldn't fetch floating-point state from %s"), proc_string (thread)); return; } if (!state.initialized) { /* The floating-point state isn't initialized. */ i387_supply_fsave (regcache, -1, NULL); } else { /* Supply the floating-point registers. */ i387_supply_fsave (regcache, -1, state.hw_state); } } #ifdef HAVE_SYS_PROCFS_H /* These two calls are used by the core-regset.c code for reading ELF core files. */ void supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs) { int i; for (i = 0; i < I386_NUM_GREGS; i++) regcache_raw_supply (regcache, i, CREG_ADDR (gregs, i)); } void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) { i387_supply_fsave (regcache, -1, fpregs); } #endif /* Fetch register REGNO, or all regs if REGNO is -1. */ static void gnu_fetch_registers (struct target_ops *ops, struct regcache *regcache, int regno) { struct proc *thread; /* Make sure we know about new threads. */ inf_update_procs (gnu_current_inf); thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (inferior_ptid)); if (!thread) error (_("Can't fetch registers from thread %s: No such thread"), target_pid_to_str (inferior_ptid)); if (regno < I386_NUM_GREGS || regno == -1) { thread_state_t state; /* This does the dirty work for us. */ state = proc_get_state (thread, 0); if (!state) { warning (_("Couldn't fetch registers from %s"), proc_string (thread)); return; } if (regno == -1) { int i; proc_debug (thread, "fetching all register"); for (i = 0; i < I386_NUM_GREGS; i++) regcache_raw_supply (regcache, i, REG_ADDR (state, i)); thread->fetched_regs = ~0; } else { proc_debug (thread, "fetching register %s", gdbarch_register_name (get_regcache_arch (regcache), regno)); regcache_raw_supply (regcache, regno, REG_ADDR (state, regno)); thread->fetched_regs |= (1 << regno); } } if (regno >= I386_NUM_GREGS || regno == -1) { proc_debug (thread, "fetching floating-point registers"); fetch_fpregs (regcache, thread); } } /* Store the whole floating-point state into THREAD using information from the corresponding (pseudo) registers. */ static void store_fpregs (const struct regcache *regcache, struct proc *thread, int regno) { mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; struct i386_float_state state; error_t err; err = thread_get_state (thread->port, i386_FLOAT_STATE, (thread_state_t) &state, &count); if (err) { warning (_("Couldn't fetch floating-point state from %s"), proc_string (thread)); return; } /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow take into account DEPRECATED_REGISTER_VALID like the old code did? */ i387_collect_fsave (regcache, regno, state.hw_state); err = thread_set_state (thread->port, i386_FLOAT_STATE, (thread_state_t) &state, i386_FLOAT_STATE_COUNT); if (err) { warning (_("Couldn't store floating-point state into %s"), proc_string (thread)); return; } } /* Store at least register REGNO, or all regs if REGNO == -1. */ static void gnu_store_registers (struct target_ops *ops, struct regcache *regcache, int regno) { struct proc *thread; struct gdbarch *gdbarch = get_regcache_arch (regcache); /* Make sure we know about new threads. */ inf_update_procs (gnu_current_inf); thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (inferior_ptid)); if (!thread) error (_("Couldn't store registers into thread %s: No such thread"), target_pid_to_str (inferior_ptid)); if (regno < I386_NUM_GREGS || regno == -1) { thread_state_t state; thread_state_data_t old_state; int was_aborted = thread->aborted; int was_valid = thread->state_valid; int trace; if (!was_aborted && was_valid) memcpy (&old_state, &thread->state, sizeof (old_state)); state = proc_get_state (thread, 1); if (!state) { warning (_("Couldn't store registers into %s"), proc_string (thread)); return; } /* Save the T bit. We might try to restore the %eflags register below, but changing the T bit would seriously confuse GDB. */ trace = ((struct i386_thread_state *)state)->efl & 0x100; if (!was_aborted && was_valid) /* See which registers have changed after aborting the thread. */ { int check_regno; for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++) if ((thread->fetched_regs & (1 << check_regno)) && memcpy (REG_ADDR (&old_state, check_regno), REG_ADDR (state, check_regno), register_size (gdbarch, check_regno))) /* Register CHECK_REGNO has changed! Ack! */ { warning (_("Register %s changed after the thread was aborted"), gdbarch_register_name (gdbarch, check_regno)); if (regno >= 0 && regno != check_regno) /* Update GDB's copy of the register. */ regcache_raw_supply (regcache, check_regno, REG_ADDR (state, check_regno)); else warning (_("... also writing this register! " "Suspicious...")); } } if (regno == -1) { int i; proc_debug (thread, "storing all registers"); for (i = 0; i < I386_NUM_GREGS; i++) if (REG_VALID == regcache_register_status (regcache, i)) regcache_raw_collect (regcache, i, REG_ADDR (state, i)); } else { proc_debug (thread, "storing register %s", gdbarch_register_name (gdbarch, regno)); gdb_assert (REG_VALID == regcache_register_status (regcache, regno)); regcache_raw_collect (regcache, regno, REG_ADDR (state, regno)); } /* Restore the T bit. */ ((struct i386_thread_state *)state)->efl &= ~0x100; ((struct i386_thread_state *)state)->efl |= trace; } if (regno >= I386_NUM_GREGS || regno == -1) { proc_debug (thread, "storing floating-point registers"); store_fpregs (regcache, thread, regno); } } /* Provide a prototype to silence -Wmissing-prototypes. */ extern initialize_file_ftype _initialize_i386gnu_nat; void _initialize_i386gnu_nat (void) { struct target_ops *t; /* Fill in the generic GNU/Hurd methods. */ t = gnu_target (); t->to_fetch_registers = gnu_fetch_registers; t->to_store_registers = gnu_store_registers; /* Register the target. */ add_target (t); }