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135 lines
2.9 KiB
ArmAsm
135 lines
2.9 KiB
ArmAsm
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/* Save current context and install the given one.
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Copyright (C) 2005 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, 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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/* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */
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.text
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.align 5
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cfi_startproc
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ENTRY(__swapcontext)
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/* Return value of getcontext. R0 is the only register whose
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value is not preserved. */
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mov #0, r0
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mov.l r0, @(oR0,r4)
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mov.l r1, @(oR1,r4)
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mov.l r2, @(oR2,r4)
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mov.l r3, @(oR3,r4)
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mov.l r4, @(oR4,r4)
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mov.l r5, @(oR5,r4)
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mov.l r6, @(oR6,r4)
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mov.l r7, @(oR7,r4)
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mov r4, r0
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add #(oMACL+4), r0
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sts.l macl, @-r0
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sts.l mach, @-r0
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stc.l gbr, @-r0
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/* Save T flag to SR. */
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movt r1
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mov.l r1, @-r0
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sts.l pr, @-r0
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/* The return address of getcontext is the restart pc. */
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sts.l pr, @-r0
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mov.l r15, @-r0
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mov.l r14, @-r0
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mov.l r13, @-r0
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mov.l r12, @-r0
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mov.l r11, @-r0
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mov.l r10, @-r0
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mov.l r9, @-r0
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mov.l r8, @-r0
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mov r5, r8
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/* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask). */
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add #oSIGMASK, r5
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mov r4, r6
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add #oSIGMASK, r6
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mov #SIG_SETMASK, r4
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mov #+SYS_ify(sigprocmask), r3
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trapa #0x13
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mov r0, r1
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mov #-12, r2
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shad r2, r1
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not r1, r1 // r1=0 means r0 = -1 to -4095
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tst r1, r1 // i.e. error in linux
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bf .Lswapcontext_restore
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.Lsyscall_error:
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SYSCALL_ERROR_HANDLER
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.Lpseudo_end:
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rts
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nop
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.Lswapcontext_restore:
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mov r8, r0
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add #(oPC), r0
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mov.l @r0+, r2
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lds.l @r0+, pr
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/* Restore T frag. */
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mov.l @r0+, r1
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shlr r1
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/* Skip GBR which is used for thread pointer. */
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add #4, r0
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lds.l @r0+, mach
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lds.l @r0+, macl
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mov r8, r0
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add #(oR9), r0
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mov.l @r0+, r9
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mov.l @r0+, r10
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mov.l @r0+, r11
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mov.l @r0+, r12
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mov.l @r0+, r13
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mov.l @r0+, r14
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mov.l @r0+, r15
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mov r8, r0
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mov.l @(oR0,r0), r1
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mov.l r1, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r1, 0)
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mov.l r2, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r2, 0)
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mov.l @(oR1,r0), r1
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mov.l @(oR2,r0), r2
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mov.l @(oR3,r0), r3
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mov.l @(oR4,r0), r4
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mov.l @(oR5,r0), r5
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mov.l @(oR6,r0), r6
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mov.l @(oR7,r0), r7
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mov.l @(oR8,r0), r8
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mov.l @r15+, r0
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jmp @r0
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mov.l @r15+, r0
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cfi_endproc
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PSEUDO_END(__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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