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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* Setup thread stack. Hurd/i386 version.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include <assert.h>
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#include <mach.h>
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#include <pt-internal.h>
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/* The stack layout used on the i386 is:
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-----------------
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| ARG |
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-----------------
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| START_ROUTINE |
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-----------------
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| 0 |
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-----------------
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*/
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/* Set up the stack for THREAD, such that it appears as if
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START_ROUTINE and ARG were passed to the new thread's entry-point.
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Return the stack pointer for the new thread. */
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static void *
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stack_setup (struct __pthread *thread,
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void *(*start_routine) (void *), void *arg)
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{
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error_t err;
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uintptr_t *bottom, *top;
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/* Calculate the top of the new stack. */
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bottom = thread->stackaddr;
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top = (uintptr_t *) ((uintptr_t) bottom + thread->stacksize
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+ ((thread->guardsize + __vm_page_size - 1)
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/ __vm_page_size) * __vm_page_size);
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if (start_routine != NULL)
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{
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/* And then the call frame. */
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top -= 3;
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top = (uintptr_t *) ((uintptr_t) top & ~0xf);
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top[2] = (uintptr_t) arg; /* Argument to START_ROUTINE. */
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top[1] = (uintptr_t) start_routine;
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top[0] = (uintptr_t) thread;
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*--top = 0; /* Fake return address. */
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}
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if (thread->guardsize)
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{
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err = __vm_protect (__mach_task_self (), (vm_address_t) bottom,
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thread->guardsize, 0, 0);
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assert_perror (err);
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}
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return top;
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}
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int
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__pthread_setup (struct __pthread *thread,
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void (*entry_point) (struct __pthread *, void *(*)(void *),
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void *), void *(*start_routine) (void *),
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void *arg)
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{
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tcbhead_t *tcb;
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error_t err;
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mach_port_t ktid;
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thread->mcontext.pc = entry_point;
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thread->mcontext.sp = stack_setup (thread, start_routine, arg);
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ktid = __mach_thread_self ();
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if (thread->kernel_thread == ktid)
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/* Fix up the TCB for the main thread. The C library has already
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installed a TCB, which we want to keep using. This TCB must not
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be freed so don't register it in the thread structure. On the
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other hand, it's not yet possible to reliably release a TCB.
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Leave the unused one registered so that it doesn't leak. The
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only thing left to do is to correctly set the `self' member in
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the already existing TCB. */
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tcb = THREAD_SELF;
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else
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{
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err = __thread_set_pcsptp (thread->kernel_thread,
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1, thread->mcontext.pc,
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1, thread->mcontext.sp,
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1, thread->tcb);
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assert_perror (err);
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tcb = thread->tcb;
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}
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__mach_port_deallocate (__mach_task_self (), ktid);
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tcb->self = thread->kernel_thread;
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return 0;
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}
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