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688903eb3e
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116 lines
3.0 KiB
ArmAsm
116 lines
3.0 KiB
ArmAsm
/* Copyright (C) 2012-2018 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <rtld-global-offsets.h>
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#include "ucontext_i.h"
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.syntax unified
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.text
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/* int getcontext (ucontext_t *ucp) */
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ENTRY(__getcontext)
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/* No need to save r0-r3, d0-d7, or d16-d31. */
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add r1, r0, #MCONTEXT_ARM_R4
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stmia r1, {r4-r11}
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/* Save R13 separately as Thumb can't STM it. */
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str r13, [r0, #MCONTEXT_ARM_SP]
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str r14, [r0, #MCONTEXT_ARM_LR]
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/* Return to LR */
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str r14, [r0, #MCONTEXT_ARM_PC]
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/* Return zero */
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mov r2, #0
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str r2, [r0, #MCONTEXT_ARM_R0]
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/* Save ucontext_t * across the next call. */
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mov r4, r0
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/* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
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mov r0, #SIG_BLOCK
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mov r1, #0
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add r2, r4, #UCONTEXT_SIGMASK
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bl PLTJMP(__sigprocmask)
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/* Store FP regs. Much of the FP code is copied from arm/setjmp.S. */
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#ifdef PIC
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ldr r2, 1f
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ldr r1, .Lrtld_global_ro
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0: add r2, pc, r2
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ldr r2, [r2, r1]
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ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
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#else
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ldr r2, .Lhwcap
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ldr r2, [r2, #0]
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#endif
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add r0, r4, #UCONTEXT_REGSPACE
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#ifdef __SOFTFP__
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tst r2, #HWCAP_ARM_VFP
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beq .Lno_vfp
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#endif
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/* Store the VFP registers.
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Don't use VFP instructions directly because this code
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is used in non-VFP multilibs. */
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/* Following instruction is vstmia r0!, {d8-d15}. */
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stc p11, cr8, [r0], #64
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/* Store the floating-point status register. */
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/* Following instruction is vmrs r1, fpscr. */
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mrc p10, 7, r1, cr1, cr0, 0
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str r1, [r0], #4
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.Lno_vfp:
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tst r2, #HWCAP_ARM_IWMMXT
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beq .Lno_iwmmxt
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/* Save the call-preserved iWMMXt registers. */
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/* Following instructions are wstrd wr10, [r0], #8 (etc.) */
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stcl p1, cr10, [r0], #8
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stcl p1, cr11, [r0], #8
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stcl p1, cr12, [r0], #8
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stcl p1, cr13, [r0], #8
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stcl p1, cr14, [r0], #8
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stcl p1, cr15, [r0], #8
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.Lno_iwmmxt:
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/* Restore the clobbered R4 and LR. */
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ldr r14, [r4, #MCONTEXT_ARM_LR]
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ldr r4, [r4, #MCONTEXT_ARM_R4]
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mov r0, #0
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DO_RET(r14)
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END(__getcontext)
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#ifdef PIC
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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#else
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.Lhwcap:
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.long C_SYMBOL_NAME(_dl_hwcap)
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#endif
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weak_alias(__getcontext, getcontext)
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