diff options
Diffstat (limited to 'sysdeps/mach/hurd/i386/htl/pt-setup.c')
| -rw-r--r-- | sysdeps/mach/hurd/i386/htl/pt-setup.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/i386/htl/pt-setup.c b/sysdeps/mach/hurd/i386/htl/pt-setup.c new file mode 100644 index 0000000000..a59f71b7be --- /dev/null +++ b/sysdeps/mach/hurd/i386/htl/pt-setup.c @@ -0,0 +1,110 @@ +/* Setup thread stack. Hurd/i386 version. + Copyright (C) 2000-2018 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see <http://www.gnu.org/licenses/>. */ + +#include <stdint.h> +#include <assert.h> +#include <mach.h> + +#include <pt-internal.h> + +/* The stack layout used on the i386 is: + + ----------------- + | ARG | + ----------------- + | START_ROUTINE | + ----------------- + | 0 | + ----------------- + */ + +/* Set up the stack for THREAD, such that it appears as if + START_ROUTINE and ARG were passed to the new thread's entry-point. + Return the stack pointer for the new thread. */ +static void * +stack_setup (struct __pthread *thread, + void *(*start_routine) (void *), void *arg) +{ + error_t err; + uintptr_t *bottom, *top; + + /* Calculate the top of the new stack. */ + bottom = thread->stackaddr; + top = (uintptr_t *) ((uintptr_t) bottom + thread->stacksize + + ((thread->guardsize + __vm_page_size - 1) + / __vm_page_size) * __vm_page_size); + + if (start_routine != NULL) + { + /* And then the call frame. */ + top -= 3; + top = (uintptr_t *) ((uintptr_t) top & ~0xf); + top[2] = (uintptr_t) arg; /* Argument to START_ROUTINE. */ + top[1] = (uintptr_t) start_routine; + top[0] = (uintptr_t) thread; + *--top = 0; /* Fake return address. */ + } + + if (thread->guardsize) + { + err = __vm_protect (__mach_task_self (), (vm_address_t) bottom, + thread->guardsize, 0, 0); + assert_perror (err); + } + + return top; +} + +int +__pthread_setup (struct __pthread *thread, + void (*entry_point) (struct __pthread *, void *(*)(void *), + void *), void *(*start_routine) (void *), + void *arg) +{ + tcbhead_t *tcb; + error_t err; + mach_port_t ktid; + + thread->mcontext.pc = entry_point; + thread->mcontext.sp = stack_setup (thread, start_routine, arg); + + ktid = __mach_thread_self (); + if (thread->kernel_thread == ktid) + /* Fix up the TCB for the main thread. The C library has already + installed a TCB, which we want to keep using. This TCB must not + be freed so don't register it in the thread structure. On the + other hand, it's not yet possible to reliably release a TCB. + Leave the unused one registered so that it doesn't leak. The + only thing left to do is to correctly set the `self' member in + the already existing TCB. */ + tcb = THREAD_SELF; + else + { + err = __thread_set_pcsptp (thread->kernel_thread, + 1, thread->mcontext.pc, + 1, thread->mcontext.sp, + 1, thread->tcb); + assert_perror (err); + tcb = thread->tcb; + } + __mach_port_deallocate (__mach_task_self (), ktid); + + tcb->self = thread->kernel_thread; + + return 0; +} |