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68 lines
2.4 KiB
ArmAsm
68 lines
2.4 KiB
ArmAsm
/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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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/* Please consult the file sysdeps/unix/sysv/linux/s390/sysdep.h for
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more information about the value -4095 used below.*/
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ENTRY (syscall)
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/* Save registers and setup stack. */
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stm %r6,%r15,24(%r15) /* save registers */
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cfi_offset (%r15, -36)
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cfi_offset (%r14, -40)
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cfi_offset (%r13, -44)
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cfi_offset (%r12, -48)
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cfi_offset (%r11, -52)
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cfi_offset (%r10, -56)
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cfi_offset (%r9, -60)
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cfi_offset (%r8, -64)
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cfi_offset (%r7, -68)
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cfi_offset (%r6, -72)
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lr %r1,%r15
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l %r0,4(0,%r15) /* load eos */
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ahi %r15,-96 /* buy stack space */
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cfi_adjust_cfa_offset (96)
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st %r1,0(0,%r15) /* store back chain */
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st %r0,4(0,%r15) /* store eos */
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lr %r1,%r2 /* move syscall number */
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lr %r2,%r3 /* first parameter */
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lr %r3,%r4 /* second parameter */
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lr %r4,%r5 /* third parameter */
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lr %r5,%r6 /* fourth parameter */
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l %r6,192(%r15) /* fifth parameter */
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l %r7,196(%r15) /* sixth parameter */
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basr %r8,0
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0: cl %r1,4f-0b(%r8) /* svc number < 256? */
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jl 2f
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1: svc 0
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j 3f
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2: ex %r1,1b-0b(%r8) /* lsb of R1 is subsituted as SVC number */
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3: l %r15,0(%r15) /* load back chain */
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cfi_adjust_cfa_offset (-96)
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lm %r6,15,24(%r15) /* load registers */
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lhi %r0,-4095
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clr %r2,%r0 /* check R2 for error */
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jnl SYSCALL_ERROR_LABEL
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br %r14 /* return to caller */
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4: .long 256
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PSEUDO_END (syscall)
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