2001-03-12 09:41:17 +00:00
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/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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2000-08-02 15:15:00 +00:00
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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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2001-07-06 04:58:11 +00:00
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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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2000-08-02 15:15:00 +00:00
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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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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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2000-08-02 15:15:00 +00:00
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2001-07-06 04:58:11 +00:00
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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2000-08-02 15:15:00 +00:00
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#ifndef _LINUX_S390_SYSDEP_H
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2001-03-12 09:41:17 +00:00
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#define _LINUX_S390_SYSDEP_H
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2000-08-02 15:15:00 +00:00
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2001-03-16 09:57:45 +00:00
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#include <sysdeps/s390/s390-32/sysdep.h>
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2000-08-02 15:15:00 +00:00
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#include <sysdeps/unix/sysdep.h>
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
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#define __NR_syscall 0
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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/* ELF-like local names start with `.L'. */
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#undef L
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#define L(name) .L##name
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#ifdef __ASSEMBLER__
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/* Linux uses a negative return value to indicate syscall errors, unlike
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most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be negative
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even if the call succeeded. E.g., the `lseek' system call might return
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a large offset. Therefore we must not anymore test for < 0, but test
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for a real error by making sure the value in gpr2 is a real error
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number. Linus said he will make sure the no syscall returns a value
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in -1 .. -4095 as a valid result so we can savely test with -4095. */
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#define SYSCALL_ERROR_LABEL 0f
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (args, syscall_name); \
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lhi %r4,-4095 ; \
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clr %r2,%r4 ; \
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jnl SYSCALL_ERROR_LABEL ; \
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L(pseudo_end):
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER; \
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END (name)
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#ifndef _LIBC_REENTRANT
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#ifndef PIC
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#define SYSCALL_ERROR_HANDLER \
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0: lcr %r2,%r2 ; \
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basr %r1,0 ; \
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1: l %r1,2f-1b(%r1) \
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st %r2,0(%r1) \
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lhi %r2,-1 \
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br %r14 \
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2: .long errno
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#else
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#define SYSCALL_ERROR_HANDLER \
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0: basr %r1,0 ; \
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1: al %r1,2f-1b(%r1) ; \
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l %r1,errno@GOT12(%r1) ; \
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lcr %r2,%r2 ; \
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st %r2,0(%r1) ; \
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lhi %r2,-1 ; \
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br %r14 ; \
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2: .long _GLOBAL_OFFSET_TABLE_-1b
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#endif /* PIC */
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#else
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#define SYSCALL_ERROR_HANDLER \
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0: basr %r1,0 ; \
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1: al %r1,2f-1b(%r1) ; \
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br %r1 ; \
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2: .long __syscall_error@PLT-1b
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#endif /* _LIBC_REENTRANT */
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/* Linux takes system call arguments in registers:
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syscall number 1 call-clobbered
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arg 1 2 call-clobbered
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arg 2 3 call-clobbered
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arg 3 4 call-clobbered
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arg 4 5 call-clobbered
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arg 5 6 call-saved
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(Of course a function with say 3 arguments does not have entries for
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arguments 4 and 5.)
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S390 does not need to do ANY stack operations to get its parameters
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right.
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*/
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#define DO_CALL(args, syscall) \
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svc SYS_ify (syscall)
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#define ret \
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br 14
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#endif /* __ASSEMBLER__ */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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DECLARGS_##nr(args) \
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int err; \
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asm volatile ( \
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LOADARGS_##nr \
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"svc %b1\n\t" \
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"lr %0,%%r2\n\t" \
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: "=d" (err) \
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: "I" (__NR_##name) ASMFMT_##nr \
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: "memory", "cc", "2", "3", "4", "5", "6"); \
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if (err >= 0xfffff001) \
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{ \
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__set_errno(-err); \
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err = 0xffffffff; \
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} \
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(int) err; })
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#define DECLARGS_0()
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#define DECLARGS_1(arg1) \
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unsigned int gpr2 = (unsigned int) (arg1);
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#define DECLARGS_2(arg1, arg2) \
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DECLARGS_1(arg1) \
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unsigned int gpr3 = (unsigned int) (arg2);
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#define DECLARGS_3(arg1, arg2, arg3) \
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DECLARGS_2(arg1, arg2) \
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unsigned int gpr4 = (unsigned int) (arg3);
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#define DECLARGS_4(arg1, arg2, arg3, arg4) \
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DECLARGS_3(arg1, arg2, arg3) \
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unsigned int gpr5 = (unsigned int) (arg4);
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#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
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DECLARGS_4(arg1, arg2, arg3, arg4) \
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unsigned int gpr6 = (unsigned int) (arg5);
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#define LOADARGS_0
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#define LOADARGS_1 "L 2,%2\n\t"
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#define LOADARGS_2 LOADARGS_1 "L 3,%3\n\t"
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#define LOADARGS_3 LOADARGS_2 "L 4,%4\n\t"
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#define LOADARGS_4 LOADARGS_3 "L 5,%5\n\t"
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#define LOADARGS_5 LOADARGS_4 "L 6,%6\n\t"
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#define ASMFMT_0
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#define ASMFMT_1 , "m" (gpr2)
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#define ASMFMT_2 , "m" (gpr2), "m" (gpr3)
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#define ASMFMT_3 , "m" (gpr2), "m" (gpr3), "m" (gpr4)
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#define ASMFMT_4 , "m" (gpr2), "m" (gpr3), "m" (gpr4), "m" (gpr5)
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#define ASMFMT_5 , "m" (gpr2), "m" (gpr3), "m" (gpr4), "m" (gpr5), "m" (gpr6)
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#if 0
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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DECLARGS_##nr(args) \
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asm volatile ( \
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"svc %b1\n\t" \
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: "+d" (gpr2) \
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: "I" (__NR_##name) ASMFMT_##nr : "memory", "cc"); \
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if (gpr2 >= 0xfffff001) \
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{ \
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__set_errno(-gpr2); \
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gpr2 = 0xffffffff; \
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} \
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(int) gpr2; })
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#define DECLARGS_0() \
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register unsigned int gpr2 asm("2");
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#define DECLARGS_1(arg1) \
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register unsigned int gpr2 asm("2") = (unsigned int) (arg1);
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#define DECLARGS_2(arg1, arg2) \
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DECLARGS_1(arg1) \
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register unsigned int gpr3 asm("3") = (unsigned int) (arg2);
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#define DECLARGS_3(arg1, arg2, arg3) \
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DECLARGS_2(arg1, arg2) \
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register unsigned int gpr4 asm("4") = (unsigned int) (arg3);
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#define DECLARGS_4(arg1, arg2, arg3, arg4) \
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DECLARGS_3(arg1, arg2, arg3) \
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register unsigned int gpr5 asm("5") = (unsigned int) (arg4);
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#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
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DECLARGS_4(arg1, arg2, arg3, arg4) \
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register unsigned int gpr6 asm("6") = (unsigned int) (arg5);
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#define ASMFMT_0
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#define ASMFMT_1
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#define ASMFMT_2 , "d" (gpr3)
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#define ASMFMT_3 , "d" (gpr3), "d" (gpr4)
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#define ASMFMT_4 , "d" (gpr3), "d" (gpr4), "d" (gpr5)
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#define ASMFMT_5 , "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
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#endif /* 0 */
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#endif /* _LINUX_S390_SYSDEP_H */
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