mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
106 lines
2.8 KiB
ArmAsm
106 lines
2.8 KiB
ArmAsm
|
/* Save current context.
|
||
|
|
|
||
|
|
Copyright (C) 2009-2012 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 <sysdep.h>
|
||
|
|
#include "ucontext_i.h"
|
||
|
|
#include "ucontext-internal.h"
|
||
|
|
|
||
|
|
/* int getcontext (ucontext_t *ucp)
|
||
|
|
|
||
|
|
Returns 0 on success -1 and errno on failure.
|
||
|
|
*/
|
||
|
|
|
||
|
|
.text
|
||
|
|
|
||
|
|
ENTRY(__getcontext)
|
||
|
|
/* The saved context will return to the getcontext() call point
|
||
|
|
with a return value of 0 */
|
||
|
|
str xzr, [x0, oX0 + 0 * SZREG]
|
||
|
|
|
||
|
|
stp x18, x19, [x0, oX0 + 18 * SZREG]
|
||
|
|
stp x20, x21, [x0, oX0 + 20 * SZREG]
|
||
|
|
stp x22, x23, [x0, oX0 + 22 * SZREG]
|
||
|
|
stp x24, x25, [x0, oX0 + 24 * SZREG]
|
||
|
|
stp x26, x27, [x0, oX0 + 26 * SZREG]
|
||
|
|
stp x28, x29, [x0, oX0 + 28 * SZREG]
|
||
|
|
str x30, [x0, oX0 + 30 * SZREG]
|
||
|
|
|
||
|
|
/* Place LR into the saved PC, this will ensure that when
|
||
|
|
switching to this saved context with setcontext() control
|
||
|
|
will pass back to the caller of getcontext(), we have
|
||
|
|
already arrange to return the appropriate return value in x0
|
||
|
|
above. */
|
||
|
|
str x30, [x0, oPC]
|
||
|
|
|
||
|
|
/* Save the current SP */
|
||
|
|
mov x2, sp
|
||
|
|
str x2, [x0, oSP]
|
||
|
|
|
||
|
|
/* Figure out where to place the first context extension
|
||
|
|
block. */
|
||
|
|
add x2, x0, #oEXTENSION
|
||
|
|
|
||
|
|
/* Write the context extension fpsimd header. */
|
||
|
|
mov w3, #(FPSIMD_MAGIC & 0xffff)
|
||
|
|
movk w3, #(FPSIMD_MAGIC >> 16), lsl #16
|
||
|
|
str w3, [x2, #oHEAD + oMAGIC]
|
||
|
|
mov w3, #FPSIMD_CONTEXT_SIZE
|
||
|
|
str w3, [x2, #oHEAD + oSIZE]
|
||
|
|
|
||
|
|
/* Fill in the FP SIMD context. */
|
||
|
|
add x3, x2, #oV0 + 8 * SZVREG
|
||
|
|
stp d8, d9, [x3], # 2 * SZVREG
|
||
|
|
stp d10, d11, [x3], # 2 * SZVREG
|
||
|
|
stp d12, d13, [x3], # 2 * SZVREG
|
||
|
|
stp d14, d15, [x3], # 2 * SZVREG
|
||
|
|
|
||
|
|
add x3, x2, oFPSR
|
||
|
|
|
||
|
|
mrs x4, fpsr
|
||
|
|
str w4, [x3]
|
||
|
|
|
||
|
|
mrs x4, fpcr
|
||
|
|
str w4, [x3, oFPCR - oFPSR]
|
||
|
|
|
||
|
|
/* Write the termination context extension header. */
|
||
|
|
add x2, x2, #FPSIMD_CONTEXT_SIZE
|
||
|
|
|
||
|
|
str xzr, [x2, #oHEAD + oMAGIC]
|
||
|
|
str xzr, [x2, #oHEAD + oSIZE]
|
||
|
|
|
||
|
|
/* Grab the signal mask */
|
||
|
|
/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
|
||
|
|
add x2, x0, #UCONTEXT_SIGMASK
|
||
|
|
mov x0, SIG_BLOCK
|
||
|
|
mov x1, 0
|
||
|
|
mov x3, _NSIG8
|
||
|
|
mov x8, SYS_ify (rt_sigprocmask)
|
||
|
|
svc 0
|
||
|
|
cbnz x0, 1f
|
||
|
|
|
||
|
|
/* Return 0 for success */
|
||
|
|
mov x0, 0
|
||
|
|
RET
|
||
|
|
1:
|
||
|
|
b C_SYMBOL_NAME(__syscall_error)
|
||
|
|
|
||
|
|
PSEUDO_END (__getcontext)
|
||
|
|
weak_alias (__getcontext, getcontext)
|