mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
4a373ea7d6
The existing two macros, MACHINE_THREAD_STATE_SET_PC and MACHINE_THREAD_STATE_SET_SP, can be used to set program counter and the stack pointer registers in a machine-specific thread state structure. Useful as it is, this may not be enough to set up the thread to make a function call, because the machine-specific ABI may impose additional requirements. In particular, x86_64 ABI requires that upon function entry, the stack pointer is 8 less than 16-byte aligned (sp & 15 == 8). To deal with this, introduce a new macro, MACHINE_THREAD_STATE_SETUP_CALL (), which sets both stack and instruction pointers, and also applies any machine-specific requirements to make a valid function call. The default implementation simply forwards to MACHINE_THREAD_STATE_SET_PC and MACHINE_THREAD_STATE_SET_SP, but on x86_64 we additionally align the stack pointer. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230517191436.73636-3-bugaevc@gmail.com>
102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/* 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;
|
|
}
|