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70 lines
1.7 KiB
ArmAsm
70 lines
1.7 KiB
ArmAsm
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/* System call interface. C-SKY ABIV2 version.
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Copyright (C) 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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/* long syscall(long sysnum, long a, long b, long c, long d, long e, long f) */
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ENTRY (syscall)
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subi sp, 8
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stw r4, (sp, 0)
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stw r5, (sp, 4)
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mov t0, r7
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/* Put system call number in r7, adjust shift for arguments
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and load extra arguments from stack. */
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mov r7, a0
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mov a0, a1
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mov a1, a2
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mov a2, a3
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ldw a3, (sp, 8)
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ldw r4, (sp, 12)
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ldw r5, (sp, 16)
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trap 0
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/* Restore temp registers. */
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mov r7, t0
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ldw r4, (sp, 0)
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ldw r5, (sp, 4)
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addi sp, 8
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/* Check return value. */
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lrw t0, 0xfffff000
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cmphs a0, t0
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bf 1f
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#ifdef __PIC__
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subi sp, 8
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stw gb, (sp, 0)
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stw lr, (sp, 4)
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grs gb, .Lgetpc
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.Lgetpc:
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lrw t0, .Lgetpc@GOTPC
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addu gb, gb, t0
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lrw t0, __syscall_error@PLT
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ldr.w t0, (gb, t0 << 0)
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jsr t0
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ldw gb, (sp, 0)
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ldw lr, (sp, 4)
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addi sp, 8
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#else
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jmpi __syscall_error
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#endif /* __PIC__ */
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1:
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rts
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PSEUDO_END (syscall)
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