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73 lines
1.9 KiB
ArmAsm
73 lines
1.9 KiB
ArmAsm
/* Copyright (C) 2000-2015 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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.syntax unified
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#define EINVAL 22
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#ifdef __ARMEB__
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# define LOW_OFFSET 8 + 4
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/* The initial + 4 is for the stack postdecrement. */
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# define HIGH_OFFSET 4 + 8 + 0
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#else
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# define LOW_OFFSET 8 + 0
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# define HIGH_OFFSET 4 + 8 + 4
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#endif
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/* The mmap2 system call takes six arguments, all in registers. */
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.text
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ENTRY (__mmap64)
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ldr ip, [sp, $LOW_OFFSET]
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push { r5 }
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r5, 0)
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ldr r5, [sp, $HIGH_OFFSET]
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push { r4 }
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r4, 0)
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cfi_remember_state
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movs r4, ip, lsl $20 @ check that offset is page-aligned
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mov ip, ip, lsr $12
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it eq
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movseq r4, r5, lsr $12 @ check for overflow
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bne .Linval
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ldr r4, [sp, $8] @ load fd
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orr r5, ip, r5, lsl $20 @ compose page offset
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DO_CALL (mmap2, 0)
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cmn r0, $4096
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pop {r4, r5}
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cfi_adjust_cfa_offset (-8)
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cfi_restore (r4)
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cfi_restore (r5)
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it cc
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RETINSTR(cc, lr)
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b PLTJMP(syscall_error)
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cfi_restore_state
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.Linval:
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mov r0, $-EINVAL
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pop {r4, r5}
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cfi_adjust_cfa_offset (-8)
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cfi_restore (r4)
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cfi_restore (r5)
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b PLTJMP(syscall_error)
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PSEUDO_END (__mmap64)
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weak_alias (__mmap64, mmap64)
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