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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
206 lines
6.6 KiB
C
206 lines
6.6 KiB
C
/* Copyright (C) 2000-2021 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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<https://www.gnu.org/licenses/>. */
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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 <sysdeps/unix/sysv/linux/s390/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
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#include <tls.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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#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 that 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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#undef SYSCALL_ERROR_LABEL
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#ifndef PIC
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# undef SYSCALL_ERROR_LABEL
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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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# undef SYSCALL_ERROR_LABEL
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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 IS_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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# undef SYSCALL_ERROR_LABEL
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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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# undef SYSCALL_ERROR_LABEL
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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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arg 6 7 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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For system calls with 6 parameters a stack operation is required
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to load the 6th parameter to register 7. Call saved register 7 is
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moved to register 0 and back to avoid an additional stack frame.
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*/
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#define DO_CALL(syscall, args) \
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.if args > 5; \
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lr %r0,%r7; \
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l %r7,96(%r15); \
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.endif; \
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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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.if args > 5; \
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lr %r7,%r0; \
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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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#else
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# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
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# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
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#endif /* __ASSEMBLER__ */
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/* Pointer mangling support. */
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#if IS_IN (rtld)
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/* We cannot use the thread descriptor because in ld.so we use setjmp
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earlier than the descriptor is initialized. */
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#else
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/* For the time being just use stack_guard rather than a separate
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pointer_guard. */
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg, tmpreg) \
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ear tmpreg,%a0; \
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x reg,STACK_GUARD(tmpreg)
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# define PTR_MANGLE2(reg, tmpreg) \
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x reg,STACK_GUARD(tmpreg)
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# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
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# else
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# define PTR_MANGLE(var) \
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(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
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# define PTR_DEMANGLE(var) PTR_MANGLE (var)
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# endif
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#endif
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#endif /* _LINUX_S390_SYSDEP_H */
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