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mach: Add __mach_setup_thread_call ()

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This is just like mach_setup_thread (), but it's suitable for making the
thread call a function correctly, as opposed to explicitly setting the
thread's stack and instruction pointers to the given values. Internally,
it uses MACHINE_THREAD_STATE_SETUP_CALL.

Unlike mach_setup_thread (), which is exported via mach.h for the
benefit of the Hurd exec server, __mach_setup_thread_call () is private
to glibc for the time being.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-5-bugaevc@gmail.com>
This commit is contained in:
Sergey Bugaev 2023-05-17 22:14:30 +03:00 committed by Samuel Thibault
parent be9c1b9cf4
commit 01f317e98f
3 changed files with 98 additions and 40 deletions
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6
mach/mach.h
View File

@ -88,7 +88,11 @@ extern FILE *mach_open_devstream (mach_port_t device_port, const char *mode);
If STACK_BASE is not null it is filled in with the chosen stack base.
If STACK_SIZE is not null it is filled in with the chosen stack size.
Regardless, an extra page of red zone is allocated off the end; this
is not included in *STACK_SIZE. */
is not included in *STACK_SIZE.
Mote: this function is unsuitable for setting up the thread to call a
function at PC, since the architecture ABI may impose additional
requirements beyond setting PC and stack. */
kern_return_t __mach_setup_thread (task_t task, thread_t thread, void *pc,
vm_address_t *stack_base,
vm_size_t *stack_size);

100
mach/setup-thread.c
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@ -16,6 +16,7 @@
<https://www.gnu.org/licenses/>. */
#include <mach.h>
#include <mach/setup-thread.h>
#include <thread_state.h>
#include <string.h>
#include <mach/machine/vm_param.h>
@ -24,6 +25,58 @@
#define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */
static kern_return_t
mach_setup_thread_impl (task_t task, thread_t thread, int is_call,
void *pc, vm_address_t *stack_base,
vm_size_t *stack_size)
{
kern_return_t error;
struct machine_thread_state ts;
mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
vm_address_t stack;
vm_size_t size;
int anywhere;
memset (&ts, 0, sizeof (ts));
size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
stack = stack_base ? *stack_base ? : 0 : 0;
anywhere = !stack_base || !*stack_base;
error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
if (error)
return error;
if (stack_size)
*stack_size = size;
#ifdef STACK_GROWTH_DOWN
if (stack_base)
*stack_base = stack + __vm_page_size;
#elif defined (STACK_GROWTH_UP)
if (stack_base)
*stack_base = stack;
stack += size;
#else
#error stack direction unknown
#endif
if (is_call)
MACHINE_THREAD_STATE_SETUP_CALL (&ts, *stack_base, size, pc);
else
{
MACHINE_THREAD_STATE_SET_PC (&ts, pc);
MACHINE_THREAD_STATE_SET_SP (&ts, *stack_base, size);
}
/* Create the red zone. */
if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
return error;
return __thread_set_state (thread, MACHINE_NEW_THREAD_STATE_FLAVOR,
(natural_t *) &ts, tssize);
}
/* Give THREAD a stack and set it to run at PC when resumed.
If *STACK_SIZE is nonzero, that size of stack is allocated.
If *STACK_BASE is nonzero, that stack location is used.
@ -36,49 +89,18 @@ kern_return_t
__mach_setup_thread (task_t task, thread_t thread, void *pc,
vm_address_t *stack_base, vm_size_t *stack_size)
{
kern_return_t error;
struct machine_thread_state ts;
mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
vm_address_t stack;
vm_size_t size;
int anywhere;
size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
stack = stack_base ? *stack_base ? : 0 : 0;
anywhere = !stack_base || !*stack_base;
error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
if (error)
return error;
if (stack_size)
*stack_size = size;
memset (&ts, 0, sizeof (ts));
MACHINE_THREAD_STATE_SET_PC (&ts, pc);
#ifdef STACK_GROWTH_DOWN
if (stack_base)
*stack_base = stack + __vm_page_size;
ts.SP = stack + __vm_page_size + size;
#elif defined (STACK_GROWTH_UP)
if (stack_base)
*stack_base = stack;
ts.SP = stack;
stack += size;
#else
#error stack direction unknown
#endif
/* Create the red zone. */
if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
return error;
return __thread_set_state (thread, MACHINE_NEW_THREAD_STATE_FLAVOR,
(natural_t *) &ts, tssize);
return mach_setup_thread_impl (task, thread, 0, pc, stack_base, stack_size);
}
weak_alias (__mach_setup_thread, mach_setup_thread)
kern_return_t
__mach_setup_thread_call (task_t task, thread_t thread, void *pc,
vm_address_t *stack_base, vm_size_t *stack_size)
{
return mach_setup_thread_impl (task, thread, 1, pc, stack_base, stack_size);
}
/* Give THREAD a TLS area. */
kern_return_t
__mach_setup_tls (thread_t thread)

32
mach/setup-thread.h Normal file
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@ -0,0 +1,32 @@
/* Setup a Mach thread.
Copyright (C) 1993-2023 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/>. */
#ifndef _MACH_SETUP_THREAD_H
#define _MACH_SETUP_THREAD_H 1
#include <mach.h>
/* Like mach_setup_thread (), but suitable for setting up function
calls. */
kern_return_t __mach_setup_thread_call (task_t task, thread_t thread,
void *function,
vm_address_t *stack_base,
vm_size_t *stack_size);
#endif /* mach/setup-thread.h */