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/*
* MIT License
*
* Copyright (c) 2017 Luc Chabassier
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* This small helper was started from
* https://github.com/dwarfmaster/mach-ipc/blob/master/minimal_threads/main.c
* and then reworked. */
#include <testlib.h>
#include <mach/vm_param.h>
#include <mach.user.h>
thread_t test_thread_start(task_t task, void(*routine)(void*), void* arg) {
const vm_size_t stack_size = vm_page_size * 16;
kern_return_t ret;
vm_address_t stack, local_stack;
ret = vm_allocate(mach_task_self(), &local_stack, vm_page_size, TRUE);
ASSERT_RET(ret, "can't allocate local stack");
ret = vm_allocate(task, &stack, stack_size, TRUE);
ASSERT_RET(ret, "can't allocate the stack for a new thread");
ret = vm_protect(task, stack, vm_page_size, FALSE, VM_PROT_NONE);
ASSERT_RET(ret, "can't protect the stack from overflows");
long *top = (long*)(local_stack + vm_page_size) - 1;
#ifdef __i386__
*top = (long)arg; /* The argument is passed on the stack on x86_32 */
*(top - 1) = 0; /* The return address */
#elif defined(__x86_64__)
*top = 0; /* The return address */
#endif
ret = vm_write(task, stack + stack_size - vm_page_size, local_stack, vm_page_size);
ASSERT_RET(ret, "can't initialize the stack for the new thread");
ret = vm_deallocate(mach_task_self(), local_stack, vm_page_size);
ASSERT_RET(ret, "can't deallocate local stack");
thread_t thread;
ret = thread_create(task, &thread);
ASSERT_RET(ret, "thread_create()");
struct i386_thread_state state;
unsigned int count;
count = i386_THREAD_STATE_COUNT;
ret = thread_get_state(thread, i386_REGS_SEGS_STATE,
(thread_state_t) &state, &count);
ASSERT_RET(ret, "thread_get_state()");
#ifdef __i386__
state.eip = (long) routine;
state.uesp = (long) (stack + stack_size - sizeof(long) * 2);
state.ebp = 0;
#elif defined(__x86_64__)
state.rip = (long) routine;
state.ursp = (long) (stack + stack_size - sizeof(long) * 1);
state.rbp = 0;
state.rdi = (long)arg;
#endif
ret = thread_set_state(thread, i386_REGS_SEGS_STATE,
(thread_state_t) &state, i386_THREAD_STATE_COUNT);
ASSERT_RET(ret, "thread_set_state");
ret = thread_resume(thread);
ASSERT_RET(ret, "thread_resume");
return thread;
}
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