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64 lines
1.6 KiB
ArmAsm
64 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2001-2015 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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#include <sys/asm.h>
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/* Usage:
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long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
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We need to do some arg shifting, syscall_number will be in v0. */
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.text
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NESTED (syscall, SZREG, ra)
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.mask 0x00010000, -SZREG
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.fmask 0x00000000, 0
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PTR_ADDIU sp, -SZREG
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cfi_adjust_cfa_offset (SZREG)
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REG_S s0, (sp)
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cfi_rel_offset (s0, 0)
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move s0, a0
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move a0, a1 /* shift arg1 - arg7. */
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move a1, a2
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move a2, a3
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move a3, a4
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move a4, a5
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move a5, a6
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move a6, a7
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move v0, s0 /* Syscall number -> v0 */
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syscall /* Do the system call. */
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REG_L s0, (sp)
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cfi_restore (s0)
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PTR_ADDIU sp, SZREG
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cfi_adjust_cfa_offset (-SZREG)
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bne a3, zero, L(error)
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ret
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L(error):
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SETUP_GP64_REG (a0, syscall)
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PTR_LA t9, __syscall_error
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RESTORE_GP64_REG
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jr t9
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END (syscall)
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