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131fafa7da
The getcontext, and setcontext functions should not adjust the stack, and should load the stack pointer from the machine context. Calling makecontext should create a frame for spilled incoming arguments, and sync uc_stack.ss_sp to the machine context. We do not support calling getcontext, modifying ss_sp, and calling setcontext directly.
167 lines
4.3 KiB
ArmAsm
167 lines
4.3 KiB
ArmAsm
/* Get current user context.
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Copyright (C) 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Helge Deller <deller@gmx.de>, 2008.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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/* Trampoline function. Non-standard calling ABI. */
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/* Can not use ENTRY(__getcontext_ret) here. */
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.type __getcontext_ret, @function
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.hidden __getcontext_ret
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__getcontext_ret:
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.proc
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.callinfo FRAME=0,NO_CALLS
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/* r26-r23 contain original r3-r6, but because setcontext
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does not reload r3-r6 (it's using them as temporaries)
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we must save them elsewhere and swap them back in. */
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copy %r23, %r3
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copy %r24, %r4
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copy %r25, %r5
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copy %r26, %r6
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/* r20 contains original return pointer. */
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bv 0(%r20)
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copy %r0, %ret0
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.procend
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.size __getcontext_ret, .-__getcontext_ret
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ENTRY(__getcontext)
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/* Save the registers. */
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stw %r0, oR0(%r26)
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stw %r1, oR1(%r26)
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/* stw %r2, oR2(%r26) - used for trampoline. */
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stw %r3, oR3(%r26)
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stw %r4, oR4(%r26)
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stw %r5, oR5(%r26)
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stw %r6, oR6(%r26)
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stw %r7, oR7(%r26)
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stw %r8, oR8(%r26)
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stw %r9, oR9(%r26)
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stw %r10, oR10(%r26)
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stw %r11, oR11(%r26)
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stw %r12, oR12(%r26)
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stw %r13, oR13(%r26)
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stw %r14, oR14(%r26)
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stw %r15, oR15(%r26)
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stw %r16, oR16(%r26)
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stw %r17, oR17(%r26)
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stw %r18, oR18(%r26)
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stw %r19, oR19(%r26)
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/* stw %r20, oR20(%r26) - used for trampoline. */
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stw %r21, oR21(%r26)
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stw %r22, oR22(%r26)
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/* stw %r23, oR23(%r26) - used for trampoline. */
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/* stw %r24, oR24(%r26) - used for trampoline. */
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/* stw %r25, oR25(%r26) - used for trampoline. */
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/* stw %r26, oR26(%r26) - used for trampoline. */
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stw %r27, oR27(%r26)
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stw %r28, oR28(%r26)
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stw %r29, oR29(%r26)
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stw %sp, oR30(%r26)
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stw %r31, oR31(%r26)
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stw %r0, oUC_FLAGS(%r26)
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/* stw %r0, oUC_LINK(%r26) - Do not overwrite. */
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stw %sp, oSS_SP(%r26)
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stw %r0, oSS_FLAGS(%r26)
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stw %r0, oSS_SIZE(%r26)
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stw %r0, oSC_FLAGS(%r26)
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stw %r0, oIASQ0(%r26)
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stw %r0, oIASQ1(%r26)
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stw %r0, oIAOQ0(%r26)
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stw %r0, oIAOQ1(%r26)
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stw %r0, oSAR(%r26) /* used as flag in swapcontext(). */
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/* Store floating-point regs. */
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ldo oFPREGS0(%r26),%r1
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fstds,ma %fr0, 8(%r1)
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fstds,ma %fr1, 8(%r1)
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fstds,ma %fr2, 8(%r1)
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fstds,ma %fr3, 8(%r1)
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fstds,ma %fr4, 8(%r1)
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fstds,ma %fr5, 8(%r1)
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fstds,ma %fr6, 8(%r1)
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fstds,ma %fr7, 8(%r1)
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fstds,ma %fr8, 8(%r1)
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fstds,ma %fr9, 8(%r1)
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fstds,ma %fr10, 8(%r1)
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fstds,ma %fr11, 8(%r1)
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fstds,ma %fr12, 8(%r1)
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fstds,ma %fr13, 8(%r1)
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fstds,ma %fr14, 8(%r1)
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fstds,ma %fr15, 8(%r1)
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fstds,ma %fr16, 8(%r1)
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fstds,ma %fr17, 8(%r1)
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fstds,ma %fr18, 8(%r1)
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fstds,ma %fr19, 8(%r1)
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fstds,ma %fr20, 8(%r1)
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fstds,ma %fr21, 8(%r1)
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fstds,ma %fr22, 8(%r1)
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fstds,ma %fr23, 8(%r1)
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fstds,ma %fr24, 8(%r1)
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fstds,ma %fr25, 8(%r1)
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fstds,ma %fr26, 8(%r1)
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fstds,ma %fr27, 8(%r1)
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fstds,ma %fr28, 8(%r1)
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fstds,ma %fr29, 8(%r1)
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fstds,ma %fr30, 8(%r1)
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fstds %fr31, 0(%r1)
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/* Prologue */
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stwm %r4, 64(%sp)
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#ifdef PIC
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stw %r19, -32(%sp)
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#endif
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/* Set up the trampoline registers.
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r20, r23, r24, r25, r26 and r2 are clobbered
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by call to getcontext() anyway. Reuse them. */
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stw %r2, oR20(%r26)
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stw %r3, oR23(%r26)
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stw %r4, oR24(%r26)
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stw %r5, oR25(%r26)
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stw %r6, oR26(%r26)
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ldil L%__getcontext_ret, %r1
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ldo R%__getcontext_ret(%r1), %r1
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stw %r1, oR2(%r26)
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/* Save the current signal mask. */
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/* sigprocmask(SIG_BLOCK, NULL, &ucp->uc_sigmask); */
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ldo oSIGMASK(%r26), %r24
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copy %r0, %r25
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bl sigprocmask, %r2
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ldi SIG_BLOCK, %r26
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/* Epilogue */
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ldw -84(%sp), %r2
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#ifdef PIC
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ldw -96(%sp), %r19
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#endif
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bv %r0(%r2)
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ldwm -64(%sp), %r4
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END(__getcontext)
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weak_alias (__getcontext, getcontext)
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