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bc2eb9321e
With all Linux ABIs using the expected Linux kABI to indicate syscalls errors, the INTERNAL_SYSCALL_DECL is an empty declaration on all ports. This patch removes the 'err' argument on INTERNAL_SYSCALL* macro and remove the INTERNAL_SYSCALL_DECL usage. Checked with a build against all affected ABIs.
210 lines
6.4 KiB
C
210 lines
6.4 KiB
C
/* Assembler macros for 64 bit S/390.
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Copyright (C) 2001-2020 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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<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/s390-64/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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/*
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* Newer kernel versions redefined __NR_pread and __NR_pwrite to
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* __NR_pread64 and __NR_pwrite64.
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*/
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#ifndef __NR_pread
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# define __NR_pread __NR_pread64
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#endif
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#ifndef __NR_pwrite
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# define __NR_pwrite __NR_pwrite64
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#endif
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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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lghi %r4,-4095 ; \
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clgr %r2,%r4 ; \
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jgnl 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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SYSCALL_ERROR_HANDLER; \
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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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lcgr %r2,%r2
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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SYSCALL_ERROR_HANDLER; \
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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 syscall_error
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# define SYSCALL_ERROR_HANDLER
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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: larl %r1,rtld_errno; \
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lcr %r2,%r2; \
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st %r2,0(%r1); \
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lghi %r2,-1; \
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br %r14
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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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larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \
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lg %r1,0(%r1); \
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ear %r2,%a0; \
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sllg %r2,%r2,32; \
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ear %r2,%a1; \
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st %r0,0(%r1,%r2); \
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lghi %r2,-1; \
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br %r14
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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: larl %r1,_GLOBAL_OFFSET_TABLE_; \
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lg %r1,errno@GOT(%r1); \
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lcr %r2,%r2; \
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st %r2,0(%r1); \
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lghi %r2,-1; \
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br %r14
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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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lgr %r0,%r7; \
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lg %r7,160(%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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lghi %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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lgr %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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#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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sllg tmpreg,tmpreg,32; \
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ear tmpreg,%a1; \
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xg reg,STACK_GUARD(tmpreg)
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# define PTR_MANGLE2(reg, tmpreg) \
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xg 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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