2012-11-09 17:53:51 +00:00
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/* Set current context.
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2013-01-02 19:01:50 +00:00
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Copyright (C) 2009-2013 Free Software Foundation, Inc.
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2012-11-09 17:53:51 +00:00
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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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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#include "ucontext-internal.h"
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/* int setcontext (const ucontext_t *ucp) */
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.text
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ENTRY(__setcontext)
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/* Create a signal frame on the stack:
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fp
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lr
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...
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sp-> rt_sigframe
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*/
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stp x29, x30, [sp, -16]!
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (x29, 0)
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cfi_rel_offset (x30, 8)
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mov x29, sp
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cfi_def_cfa_register (x29)
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/* Allocate space for the sigcontext. */
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mov w3, #((RT_SIGFRAME_SIZE + SP_ALIGN_SIZE) & SP_ALIGN_MASK)
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sub sp, sp, x3
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/* Compute the base address of the ucontext structure. */
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add x1, sp, #RT_SIGFRAME_UCONTEXT
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/* Only ucontext is required in the frame, *copy* it in. */
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#if UCONTEXT_SIZE % 16
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#error The implementation of setcontext.S assumes sizeof(ucontext_t) % 16 == 0
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#endif
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mov x2, #UCONTEXT_SIZE / 16
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0:
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ldp x3, x4, [x0], #16
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stp x3, x4, [x1], #16
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sub x2, x2, 1
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cbnz x2, 0b
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/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
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mov x8, SYS_ify (rt_sigreturn)
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svc 0
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/* Ooops we failed. Recover the stack */
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mov sp, x29
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cfi_def_cfa_register (sp)
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ldp x29, x30, [sp], 16
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cfi_adjust_cfa_offset (16)
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cfi_restore (x29)
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cfi_restore (x30)
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b C_SYMBOL_NAME(__syscall_error)
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PSEUDO_END (__setcontext)
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weak_alias (__setcontext, setcontext)
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ENTRY(__startcontext)
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mov x0, x19
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cbnz x0, __setcontext
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1: b HIDDEN_JUMPTARGET(_exit)
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END(__startcontext)
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