/* Low level interface to i386 running the GNU Hurd. Copyright 1992, 1995, 1996, 1998, 2000, 2001 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 "defs.h" #include "inferior.h" #include "floatformat.h" #include "regcache.h" #include "gdb_assert.h" #include <errno.h> #include <stdio.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) }; #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) /* Get the whole floating-point state of THREAD and record the values of the corresponding (pseudo) registers. */ static void fetch_fpregs (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. */ { int i; for (i = FP0_REGNUM; i <= FOP_REGNUM; i++) supply_register (i, NULL); return; } /* Supply the floating-point registers. */ i387_supply_fsave (current_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 (gdb_gregset_t *gregs) { int i; for (i = 0; i < I386_NUM_GREGS; i++) supply_register (i, REG_ADDR (gregs, i)); } void supply_fpregset (gdb_fpregset_t *fpregs) { i387_supply_fsave (current_regcache, -1, fpregs); } #endif /* Fetch register REGNO, or all regs if REGNO is -1. */ void gnu_fetch_registers (int regno) { struct proc *thread; /* Make sure we know about new threads. */ inf_update_procs (current_inferior); thread = inf_tid_to_thread (current_inferior, PIDGET (inferior_ptid)); if (!thread) error ("Can't fetch registers from thread %d: No such thread", PIDGET (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++) supply_register (i, REG_ADDR (state, i)); thread->fetched_regs = ~0; } else { proc_debug (thread, "fetching register %s", REGISTER_NAME (regno)); supply_register (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 (thread); } } /* Store the whole floating-point state into THREAD using information from the corresponding (pseudo) registers. */ static void store_fpregs (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_fill_fsave (state.hw_state, regno); 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. */ void gnu_store_registers (int regno) { struct proc *thread; /* Make sure we know about new threads. */ inf_update_procs (current_inferior); thread = inf_tid_to_thread (current_inferior, PIDGET (inferior_ptid)); if (!thread) error ("Couldn't store registers into thread %d: No such thread", PIDGET (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), DEPRECATED_REGISTER_RAW_SIZE (check_regno))) /* Register CHECK_REGNO has changed! Ack! */ { warning ("Register %s changed after the thread was aborted", REGISTER_NAME (check_regno)); if (regno >= 0 && regno != check_regno) /* Update GDB's copy of the register. */ supply_register (check_regno, REG_ADDR (state, check_regno)); else warning ("... also writing this register! Suspicious..."); } } #define fill(state, regno) \ memcpy (REG_ADDR(state, regno), &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)], \ DEPRECATED_REGISTER_RAW_SIZE (regno)) if (regno == -1) { int i; proc_debug (thread, "storing all registers"); for (i = 0; i < I386_NUM_GREGS; i++) if (deprecated_register_valid[i]) fill (state, i); } else { proc_debug (thread, "storing register %s", REGISTER_NAME (regno)); gdb_assert (deprecated_register_valid[regno]); fill (state, regno); } /* Restore the T bit. */ ((struct i386_thread_state *)state)->efl &= ~0x100; ((struct i386_thread_state *)state)->efl |= trace; } #undef fill if (regno >= I386_NUM_GREGS || regno == -1) { proc_debug (thread, "storing floating-point registers"); store_fpregs (thread, regno); } }