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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/* Create new context.
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Copyright (C) 2008-2021 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 <sysdep.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <ucontext.h>
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/* Sets up the outgoing arguments and the program counter for a user
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context for the requested function call.
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Returning to the correct parent context is pretty simple on
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Sparc. We only need to link up the register windows correctly.
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Since global registers are clobbered by calls, we need not be
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concerned about those, and thus is all could be worked out without
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using a trampoline.
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Except that we must deal with the signal mask, thus a trampoline
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is unavoidable. 32-bit stackframe layout:
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+-----------------------------------------+
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| 7th and further parameters |
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+-----------------------------------------+
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| backup storage for initial 6 parameters |
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+-----------------------------------------+
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| struct return pointer |
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+-----------------------------------------+
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| 8 incoming registers |
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+-----------------------------------------+
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| 8 local registers |
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%sp --> +-----------------------------------------+
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*/
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void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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extern void __start_context (void);
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unsigned long int *sp;
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va_list ap;
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int i;
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sp = (unsigned long int *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
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sp -= 16 + 7 + argc;
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sp = (unsigned long int *) (((uintptr_t) sp) & ~(8 - 1));
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for (i = 0; i < 8; i++)
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sp[i + 8] = ucp->uc_mcontext.gregs[REG_O0 + i];
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/* The struct return pointer is essentially unused, so we can
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place the link there. */
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sp[16] = (unsigned long int) ucp->uc_link;
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va_start (ap, argc);
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/* Fill in outgoing arguments, including those which will
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end up being passed on the stack. */
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for (i = 0; i < argc; i++)
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{
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unsigned long int arg = va_arg (ap, unsigned long int);
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if (i < 6)
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ucp->uc_mcontext.gregs[REG_O0 + i] = arg;
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else
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sp[i + 23 - 6] = arg;
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}
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va_end (ap);
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ucp->uc_mcontext.gregs[REG_O6] = (unsigned long int) sp;
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ucp->uc_mcontext.gregs[REG_O7] = ((unsigned long int) __start_context) - 8;
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ucp->uc_mcontext.gregs[REG_PC] = (unsigned long int) func;
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ucp->uc_mcontext.gregs[REG_nPC] = ucp->uc_mcontext.gregs[REG_PC] + 4;
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}
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weak_alias (__makecontext, makecontext)
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