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2004-10-05 Jakub Jelinek <jakub@redhat.com> * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h: Include dl-sysdep.h. * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise.
265 lines
8.9 KiB
C
265 lines
8.9 KiB
C
/* Copyright (C) 2000,01,02,03,04 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, 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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#ifndef _LINUX_S390_SYSDEP_H
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#define _LINUX_S390_SYSDEP_H
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#include <sysdeps/s390/s390-32/sysdep.h>
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#include <sysdeps/unix/sysdep.h>
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#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
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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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#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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#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 (syscall_name, args); \
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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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#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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#undef PSEUDO_NOERRNO
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args)
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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#undef PSEUDO_ERRVAL
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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lcr %r2,%r2
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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END (name)
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#ifndef PIC
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# define SYSCALL_ERROR_LABEL 0f
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# define SYSCALL_ERROR_HANDLER \
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0: basr %r1,0; \
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1: l %r1,2f-1b(%r1); \
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br %r1; \
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2: .long syscall_error
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#else
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_LABEL 0f
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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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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 rtld_errno-1b
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# elif defined _LIBC_REENTRANT
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# if USE___THREAD
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# ifndef NOT_IN_libc
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# define SYSCALL_ERROR_ERRNO __libc_errno
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# else
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# define SYSCALL_ERROR_ERRNO errno
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# endif
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# define SYSCALL_ERROR_LABEL 0f
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# define SYSCALL_ERROR_HANDLER \
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0: lcr %r0,%r2; \
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basr %r1,0; \
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1: al %r1,2f-1b(%r1); \
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l %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1) \
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ear %r2,%a0 \
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st %r0,0(%r1,%r2); \
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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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# else
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# define SYSCALL_ERROR_LABEL 0f
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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
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# else
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# define SYSCALL_ERROR_LABEL 0f
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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@GOT(%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 /* _LIBC_REENTRANT */
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#endif /* PIC */
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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(syscall, args) \
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.if SYS_ify (syscall) < 256; \
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svc SYS_ify (syscall); \
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.else; \
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lhi %r1,SYS_ify (syscall); \
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svc 0; \
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.endif
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#define ret \
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br 14
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#define ret_NOERRNO \
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br 14
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#define ret_ERRVAL \
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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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unsigned int _ret = INTERNAL_SYSCALL (name, , nr, args); \
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if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_ret, ), 0)) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
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_ret = 0xffffffff; \
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} \
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(int) _ret; })
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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#undef INTERNAL_SYSCALL_DIRECT
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#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
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({ \
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DECLARGS_##nr(args) \
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register int _ret asm("2"); \
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asm volatile ( \
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"svc %b1\n\t" \
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: "=d" (_ret) \
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: "i" (__NR_##name) ASMFMT_##nr \
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: "memory" ); \
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_ret; })
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#undef INTERNAL_SYSCALL_SVC0
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#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
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({ \
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DECLARGS_##nr(args) \
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register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
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register int _ret asm("2"); \
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asm volatile ( \
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"svc 0\n\t" \
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: "=d" (_ret) \
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: "d" (_nr) ASMFMT_##nr \
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: "memory" ); \
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_ret; })
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#undef INTERNAL_SYSCALL_NCS
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#define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
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({ \
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DECLARGS_##nr(args) \
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register unsigned long _nr asm("1") = (unsigned long)(no); \
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register int _ret asm("2"); \
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asm volatile ( \
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"svc 0\n\t" \
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: "=d" (_ret) \
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: "d" (_nr) ASMFMT_##nr \
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: "memory" ); \
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_ret; })
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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(((__NR_##name) < 256) ? \
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INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
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INTERNAL_SYSCALL_SVC0(name, err,nr, args))
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned int) (val) >= 0xfffff001u)
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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#define DECLARGS_0()
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#define DECLARGS_1(arg1) \
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register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
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#define DECLARGS_2(arg1, arg2) \
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DECLARGS_1(arg1) \
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register unsigned long gpr3 asm ("3") = (unsigned long)(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 long gpr4 asm ("4") = (unsigned long)(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 long gpr5 asm ("5") = (unsigned long)(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 long gpr6 asm ("6") = (unsigned long)(arg5);
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#define ASMFMT_0
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#define ASMFMT_1 , "0" (gpr2)
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#define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
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#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
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#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
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#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
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#endif /* _LINUX_S390_SYSDEP_H */
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