diff options
Diffstat (limited to 'REORG.TODO/mach/setup-thread.c')
| -rw-r--r-- | REORG.TODO/mach/setup-thread.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/mach/setup-thread.c b/REORG.TODO/mach/setup-thread.c new file mode 100644 index 0000000000..090d9086ad --- /dev/null +++ b/REORG.TODO/mach/setup-thread.c @@ -0,0 +1,79 @@ +/* Copyright (C) 1991-2017 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 + <http://www.gnu.org/licenses/>. */ + +#include <mach.h> +#include <thread_state.h> +#include <string.h> +#include <mach/machine/vm_param.h> +#include "sysdep.h" /* Defines stack direction. */ + +#define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */ + +/* 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. + 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. */ + +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_THREAD_STATE_FLAVOR, + (natural_t *) &ts, tssize); +} + +weak_alias (__mach_setup_thread, mach_setup_thread) |