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Diffstat (limited to 'contrib/gdb/gdb/i386gnu-nat.c')
| -rw-r--r-- | contrib/gdb/gdb/i386gnu-nat.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/i386gnu-nat.c b/contrib/gdb/gdb/i386gnu-nat.c new file mode 100644 index 0000000..7533f09 --- /dev/null +++ b/contrib/gdb/gdb/i386gnu-nat.c @@ -0,0 +1,293 @@ +/* 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); + } +} |
