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40 lines
1.6 KiB
ArmAsm
40 lines
1.6 KiB
ArmAsm
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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 <tcb-offsets.h>
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/* Save the PID value. */
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#define SAVE_PID \
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str lr, [sp, #-4]!; /* Save LR. */ \
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mov r0, #0xffff0fff; /* Point to the high page. */ \
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mov lr, pc; /* Save our return address. */ \
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sub pc, r0, #31; /* Jump to the TLS entry. */ \
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ldr lr, [sp], #4; /* Restore LR. */ \
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mov r2, r0; /* Save the TLS addr in r2. */ \
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ldr r3, [r2, #PID_OFFSET]; /* Load the saved PID. */ \
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rsbs r0, r3, #0; /* Negate it. */ \
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moveq r0, #0x80000000; /* Use 0x80000000 if it was 0. */ \
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str r0, [r2, #PID_OFFSET] /* Store the temporary PID. */
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/* Restore the old PID value in the parent. */
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#define RESTORE_PID \
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cmp r0, #0; /* If we are the parent... */ \
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strne r3, [r2, #PID_OFFSET] /* ... restore the saved PID. */
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#include "../vfork.S"
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