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- /* Low level interface to i386 running the GNU Hurd.
- Copyright (C) 1992-2022 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 this first, to pick up the <mach.h> 'thread_info' diversion. */
- #include "gnu-nat.h"
- /* Mach/Hurd headers are not yet ready for C++ compilation. */
- extern "C"
- {
- #include <mach.h>
- #include <mach_error.h>
- #include <mach/message.h>
- #include <mach/exception.h>
- }
- #include "defs.h"
- #include "x86-nat.h"
- #include "inferior.h"
- #include "floatformat.h"
- #include "regcache.h"
- #include "i386-tdep.h"
- #include "inf-child.h"
- #include "i387-tdep.h"
- /* 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])
- /* The i386 GNU Hurd target. */
- #ifdef i386_DEBUG_STATE
- using gnu_base_target = x86_nat_target<gnu_nat_target>;
- #else
- using gnu_base_target = gnu_nat_target;
- #endif
- struct i386_gnu_nat_target final : public gnu_base_target
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static i386_gnu_nat_target the_i386_gnu_nat_target;
- /* 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;
- kern_return_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);
- }
- }
- /* Fetch register REGNO, or all regs if REGNO is -1. */
- void
- i386_gnu_nat_target::fetch_registers (struct regcache *regcache, int regno)
- {
- struct proc *thread;
- ptid_t ptid = regcache->ptid ();
- /* Make sure we know about new threads. */
- inf_update_procs (gnu_current_inf);
- thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
- if (!thread)
- error (_("Can't fetch registers from thread %s: No such thread"),
- target_pid_to_str (ptid).c_str ());
- 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 (i, REG_ADDR (state, i));
- thread->fetched_regs = ~0;
- }
- else
- {
- proc_debug (thread, "fetching register %s",
- gdbarch_register_name (regcache->arch (),
- regno));
- regcache->raw_supply (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;
- kern_return_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. */
- void
- i386_gnu_nat_target::store_registers (struct regcache *regcache, int regno)
- {
- struct proc *thread;
- struct gdbarch *gdbarch = regcache->arch ();
- ptid_t ptid = regcache->ptid ();
- /* Make sure we know about new threads. */
- inf_update_procs (gnu_current_inf);
- thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
- if (!thread)
- error (_("Couldn't store registers into thread %s: No such thread"),
- target_pid_to_str (ptid).c_str ());
- 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 (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->get_register_status (i))
- regcache->raw_collect (i, REG_ADDR (state, i));
- }
- else
- {
- proc_debug (thread, "storing register %s",
- gdbarch_register_name (gdbarch, regno));
- gdb_assert (REG_VALID == regcache->get_register_status (regno));
- regcache->raw_collect (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);
- }
- }
- /* Support for debug registers. */
- #ifdef i386_DEBUG_STATE
- /* Get debug registers for thread THREAD. */
- static void
- i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
- {
- mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT;
- kern_return_t err;
- err = thread_get_state (thread->port, i386_DEBUG_STATE,
- (thread_state_t) regs, &count);
- if (err != 0 || count != i386_DEBUG_STATE_COUNT)
- warning (_("Couldn't fetch debug state from %s"),
- proc_string (thread));
- }
- /* Set debug registers for thread THREAD. */
- static void
- i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
- {
- kern_return_t err;
- err = thread_set_state (thread->port, i386_DEBUG_STATE,
- (thread_state_t) regs, i386_DEBUG_STATE_COUNT);
- if (err != 0)
- warning (_("Couldn't store debug state into %s"),
- proc_string (thread));
- }
- /* Set DR_CONTROL in THREAD. */
- static void
- i386_gnu_dr_set_control_one (struct proc *thread, void *arg)
- {
- unsigned long *control = (unsigned long *) arg;
- struct i386_debug_state regs;
- i386_gnu_dr_get (®s, thread);
- regs.dr[DR_CONTROL] = *control;
- i386_gnu_dr_set (®s, thread);
- }
- /* Set DR_CONTROL to CONTROL in all threads. */
- static void
- i386_gnu_dr_set_control (unsigned long control)
- {
- inf_update_procs (gnu_current_inf);
- inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control);
- }
- /* Parameters to set a debugging address. */
- struct reg_addr
- {
- int regnum; /* Register number (zero based). */
- CORE_ADDR addr; /* Address. */
- };
- /* Set address REGNUM (zero based) to ADDR in THREAD. */
- static void
- i386_gnu_dr_set_addr_one (struct proc *thread, void *arg)
- {
- struct reg_addr *reg_addr = (struct reg_addr *) arg;
- struct i386_debug_state regs;
- i386_gnu_dr_get (®s, thread);
- regs.dr[reg_addr->regnum] = reg_addr->addr;
- i386_gnu_dr_set (®s, thread);
- }
- /* Set address REGNUM (zero based) to ADDR in all threads. */
- static void
- i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
- {
- struct reg_addr reg_addr;
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
- reg_addr.regnum = regnum;
- reg_addr.addr = addr;
- inf_update_procs (gnu_current_inf);
- inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr);
- }
- /* Get debug register REGNUM value from only the one LWP of PTID. */
- static unsigned long
- i386_gnu_dr_get_reg (ptid_t ptid, int regnum)
- {
- struct i386_debug_state regs;
- 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.lwp ());
- i386_gnu_dr_get (®s, thread);
- return regs.dr[regnum];
- }
- /* Return the inferior's debug register REGNUM. */
- static CORE_ADDR
- i386_gnu_dr_get_addr (int regnum)
- {
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
- return i386_gnu_dr_get_reg (inferior_ptid, regnum);
- }
- /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
- static unsigned long
- i386_gnu_dr_get_status (void)
- {
- return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
- }
- /* Return the inferior's DR7 debug control register. */
- static unsigned long
- i386_gnu_dr_get_control (void)
- {
- return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
- }
- #endif /* i386_DEBUG_STATE */
- void _initialize_i386gnu_nat ();
- void
- _initialize_i386gnu_nat ()
- {
- #ifdef i386_DEBUG_STATE
- x86_dr_low.set_control = i386_gnu_dr_set_control;
- gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT);
- x86_dr_low.set_addr = i386_gnu_dr_set_addr;
- x86_dr_low.get_addr = i386_gnu_dr_get_addr;
- x86_dr_low.get_status = i386_gnu_dr_get_status;
- x86_dr_low.get_control = i386_gnu_dr_get_control;
- x86_set_debug_register_length (4);
- #endif /* i386_DEBUG_STATE */
- gnu_target = &the_i386_gnu_nat_target;
- /* Register the target. */
- add_inf_child_target (&the_i386_gnu_nat_target);
- }
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