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35810f5ccf
Since kernel 2.6.0 all Linux version accept the system call number
in register 1 for svc 0. There is no need to have special handling
that uses EX for system calls < 256. This will simplify and speed
up that code.
A microbenchmark doing "syscall(__NR_getpid);" in a loops gets faster
by ~12%.
* sysdeps/unix/sysv/linux/s390/s390-32/syscall.S: Simplify
code by always using SVC 0 instead of EX.
* sysdeps/unix/sysv/linux/s390/s390-64/syscall.S: Likewise.
63 lines
2.1 KiB
ArmAsm
63 lines
2.1 KiB
ArmAsm
/* Copyright (C) 2001-2017 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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stmg %r6,%r15,48(%r15) /* Save registers. */
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cfi_offset (%r15,-40)
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cfi_offset (%r14,-48)
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cfi_offset (%r13,-56)
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cfi_offset (%r12,-64)
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cfi_offset (%r11,-72)
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cfi_offset (%r10,-80)
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cfi_offset (%r9,-88)
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cfi_offset (%r8,-96)
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cfi_offset (%r7,-104)
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cfi_offset (%r6,-112)
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lgr %r1,%r15
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lg %r0,8(%r15) /* Load eos. */
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aghi %r15,-160 /* Buy stack space. */
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cfi_adjust_cfa_offset (160)
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stg %r1,0(%r15) /* Store back chain. */
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stg %r0,8(%r15) /* Store eos. */
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lgr %r1,%r2 /* Move syscall number. */
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lgr %r2,%r3 /* First parameter. */
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lgr %r3,%r4 /* Second parameter. */
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lgr %r4,%r5 /* Third parameter. */
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lgr %r5,%r6 /* Fourth parameter. */
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lg %r6,320(%r15) /* Fifth parameter. */
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lg %r7,328(%r15) /* Sixth parameter. */
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svc 0
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lg %r15,0(%r15) /* Load back chain. */
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cfi_adjust_cfa_offset (-160)
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lmg %r6,%r15,48(%r15) /* Load registers. */
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lghi %r0,-4095
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clgr %r2,%r0 /* Check R2 for error. */
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jgnl SYSCALL_ERROR_LABEL
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br %r14 /* Return to caller. */
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PSEUDO_END (syscall)
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