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/* Generic definitions for dealing with Mach thread states.
Copyright (C) 1994-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Everything else is called `thread_state', but CMU's header file is
called `thread_status'. Oh boy. */
#include <mach/thread_status.h>
/* The machine-dependent thread_state.h file can either define these
macros, or just define PC and SP to the register names. */
#ifndef MACHINE_THREAD_STATE_SET_PC
#define MACHINE_THREAD_STATE_SET_PC(ts, pc) \
((ts)->PC = (unsigned long int) (pc))
#endif
#ifndef MACHINE_THREAD_STATE_SET_SP
#ifdef STACK_GROWTH_UP
#define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \
((ts)->SP = (unsigned long int) (stack))
#else
#define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \
((ts)->SP = (unsigned long int) (stack) + (size))
#endif
#endif
/* Set up the thread state to call the given function on the given state.
Dependning on architecture, this may imply more than just setting PC
and SP. */
#ifndef MACHINE_THREAD_STATE_SETUP_CALL
#define MACHINE_THREAD_STATE_SETUP_CALL(ts, stack, size, func) \
(MACHINE_THREAD_STATE_SET_PC (ts, func), \
MACHINE_THREAD_STATE_SET_SP (ts, stack, size))
#endif
/* This copies architecture-specific bits from the current thread to the new
thread state. */
#ifndef MACHINE_THREAD_STATE_FIX_NEW
# define MACHINE_THREAD_STATE_FIX_NEW(ts)
#endif
/* These functions are of use in machine-dependent signal trampoline
implementations. */
#include <string.h> /* size_t, memcpy */
#include <mach/mach_interface.h> /* __thread_get_state */
static inline int
machine_get_state (thread_t thread, struct machine_thread_all_state *state,
int flavor, void *stateptr, void *scpptr, size_t size)
{
if (state->set & (1 << flavor))
{
/* Copy the saved state. */
memcpy (scpptr, stateptr, size);
return 1;
}
else
{
/* No one asked about this flavor of state before; fetch the state
directly from the kernel into the sigcontext. */
mach_msg_type_number_t got = (size / sizeof (int));
return (! __thread_get_state (thread, flavor, scpptr, &got)
&& got == (size / sizeof (int)));
}
}
static inline int
machine_get_basic_state (thread_t thread,
struct machine_thread_all_state *state)
{
mach_msg_type_number_t count;
if (state->set & (1 << MACHINE_THREAD_STATE_FLAVOR))
return 1;
count = MACHINE_THREAD_STATE_COUNT;
if (__thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
(natural_t *) &state->basic,
&count) != KERN_SUCCESS
|| count != MACHINE_THREAD_STATE_COUNT)
/* What kind of thread?? */
return 0; /* XXX */
state->set |= 1 << MACHINE_THREAD_STATE_FLAVOR;
return 1;
}
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