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I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
309 lines
10 KiB
C
309 lines
10 KiB
C
/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>,
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December 1995.
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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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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <tls.h>
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/* Defines RTLD_PRIVATE_ERRNO. */
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#include <dl-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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#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 %d0 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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/* We don't want the label for the error handler to be visible in the symbol
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table when we define it here. */
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#undef SYSCALL_ERROR_LABEL
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#ifdef PIC
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#define SYSCALL_ERROR_LABEL .Lsyscall_error
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#else
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#define SYSCALL_ERROR_LABEL __syscall_error
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#endif
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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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cmp.l &-4095, %d0; \
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jcc 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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#define ret_NOERRNO rts
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/* The function has to return the error code. */
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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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negl %d0
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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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#define ret_ERRVAL rts
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#ifdef PIC
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL: \
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PCREL_OP (lea, rtld_errno, %a0, %a0); \
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neg.l %d0; \
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move.l %d0, (%a0); \
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move.l &-1, %d0; \
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/* Copy return value to %a0 for syscalls that are declared to return \
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a pointer (e.g., mmap). */ \
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move.l %d0, %a0; \
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rts;
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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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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL: \
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neg.l %d0; \
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move.l %d0, -(%sp); \
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cfi_adjust_cfa_offset (4); \
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jbsr __m68k_read_tp@PLTPC; \
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SYSCALL_ERROR_LOAD_GOT (%a1); \
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add.l (SYSCALL_ERROR_ERRNO@TLSIE, %a1), %a0; \
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move.l (%sp)+, (%a0); \
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cfi_adjust_cfa_offset (-4); \
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move.l &-1, %d0; \
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/* Copy return value to %a0 for syscalls that are declared to return \
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a pointer (e.g., mmap). */ \
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move.l %d0, %a0; \
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rts;
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# else /* !_LIBC_REENTRANT */
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/* Store (- %d0) into errno through the GOT. */
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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL: \
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move.l (errno@GOTPC, %pc), %a0; \
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neg.l %d0; \
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move.l %d0, (%a0); \
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move.l &-1, %d0; \
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/* Copy return value to %a0 for syscalls that are declared to return \
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a pointer (e.g., mmap). */ \
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move.l %d0, %a0; \
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rts;
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# endif /* _LIBC_REENTRANT */
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#else
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# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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#endif /* PIC */
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/* Linux takes system call arguments in registers:
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syscall number %d0 call-clobbered
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arg 1 %d1 call-clobbered
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arg 2 %d2 call-saved
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arg 3 %d3 call-saved
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arg 4 %d4 call-saved
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arg 5 %d5 call-saved
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arg 6 %a0 call-clobbered
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The stack layout upon entering the function is:
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24(%sp) Arg# 6
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20(%sp) Arg# 5
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16(%sp) Arg# 4
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12(%sp) Arg# 3
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8(%sp) Arg# 2
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4(%sp) Arg# 1
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(%sp) Return address
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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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Separate move's are faster than movem, but need more space. Since
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speed is more important, we don't use movem. Since %a0 and %a1 are
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scratch registers, we can use them for saving as well. */
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#define DO_CALL(syscall_name, args) \
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move.l &SYS_ify(syscall_name), %d0; \
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DOARGS_##args \
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trap &0; \
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UNDOARGS_##args
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#define DOARGS_0 /* No arguments to frob. */
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#define UNDOARGS_0 /* No arguments to unfrob. */
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#define _DOARGS_0(n) /* No arguments to frob. */
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#define DOARGS_1 _DOARGS_1 (4)
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#define _DOARGS_1(n) move.l n(%sp), %d1; _DOARGS_0 (n)
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#define UNDOARGS_1 UNDOARGS_0
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#define DOARGS_2 _DOARGS_2 (8)
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#define _DOARGS_2(n) move.l %d2, %a0; cfi_register (%d2, %a0); \
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move.l n(%sp), %d2; _DOARGS_1 (n-4)
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#define UNDOARGS_2 UNDOARGS_1; move.l %a0, %d2; cfi_restore (%d2)
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#define DOARGS_3 _DOARGS_3 (12)
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#define _DOARGS_3(n) move.l %d3, %a1; cfi_register (%d3, %a1); \
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move.l n(%sp), %d3; _DOARGS_2 (n-4)
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#define UNDOARGS_3 UNDOARGS_2; move.l %a1, %d3; cfi_restore (%d3)
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#define DOARGS_4 _DOARGS_4 (16)
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#define _DOARGS_4(n) move.l %d4, -(%sp); \
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cfi_adjust_cfa_offset (4); cfi_rel_offset (%d4, 0); \
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move.l n+4(%sp), %d4; _DOARGS_3 (n)
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#define UNDOARGS_4 UNDOARGS_3; move.l (%sp)+, %d4; \
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cfi_adjust_cfa_offset (-4); cfi_restore (%d4)
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#define DOARGS_5 _DOARGS_5 (20)
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#define _DOARGS_5(n) move.l %d5, -(%sp); \
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cfi_adjust_cfa_offset (4); cfi_rel_offset (%d5, 0); \
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move.l n+4(%sp), %d5; _DOARGS_4 (n)
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#define UNDOARGS_5 UNDOARGS_4; move.l (%sp)+, %d5; \
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cfi_adjust_cfa_offset (-4); cfi_restore (%d5)
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#define DOARGS_6 _DOARGS_6 (24)
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#define _DOARGS_6(n) _DOARGS_5 (n-4); move.l %a0, -(%sp); \
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cfi_adjust_cfa_offset (4); \
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move.l n+12(%sp), %a0;
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#define UNDOARGS_6 move.l (%sp)+, %a0; cfi_adjust_cfa_offset (-4); \
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UNDOARGS_5
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#define ret rts
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#if 0 /* Not used by Linux */
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#define r0 %d0
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#define r1 %d1
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#define MOVE(x,y) movel x , y
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#endif
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#else /* not __ASSEMBLER__ */
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back. */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
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({ unsigned int _sys_result; \
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{ \
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/* Load argument values in temporary variables
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to perform side effects like function calls
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before the call used registers are set. */ \
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LOAD_ARGS_##nr (args) \
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LOAD_REGS_##nr \
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register int _d0 asm ("%d0") = name; \
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asm volatile ("trap #0" \
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: "=d" (_d0) \
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: "0" (_d0) ASM_ARGS_##nr \
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: "memory"); \
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_sys_result = _d0; \
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} \
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(int) _sys_result; })
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#define INTERNAL_SYSCALL(name, nr, args...) \
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INTERNAL_SYSCALL_NCS (__NR_##name, nr, ##args)
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#define LOAD_ARGS_0()
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#define LOAD_REGS_0
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#define ASM_ARGS_0
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#define LOAD_ARGS_1(a1) \
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LOAD_ARGS_0 () \
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int __arg1 = (int) (a1);
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#define LOAD_REGS_1 \
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register int _d1 asm ("d1") = __arg1; \
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LOAD_REGS_0
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#define ASM_ARGS_1 ASM_ARGS_0, "d" (_d1)
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#define LOAD_ARGS_2(a1, a2) \
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LOAD_ARGS_1 (a1) \
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int __arg2 = (int) (a2);
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#define LOAD_REGS_2 \
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register int _d2 asm ("d2") = __arg2; \
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LOAD_REGS_1
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#define ASM_ARGS_2 ASM_ARGS_1, "d" (_d2)
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#define LOAD_ARGS_3(a1, a2, a3) \
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LOAD_ARGS_2 (a1, a2) \
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int __arg3 = (int) (a3);
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#define LOAD_REGS_3 \
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register int _d3 asm ("d3") = __arg3; \
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LOAD_REGS_2
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#define ASM_ARGS_3 ASM_ARGS_2, "d" (_d3)
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#define LOAD_ARGS_4(a1, a2, a3, a4) \
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LOAD_ARGS_3 (a1, a2, a3) \
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int __arg4 = (int) (a4);
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#define LOAD_REGS_4 \
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register int _d4 asm ("d4") = __arg4; \
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LOAD_REGS_3
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#define ASM_ARGS_4 ASM_ARGS_3, "d" (_d4)
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#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
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LOAD_ARGS_4 (a1, a2, a3, a4) \
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int __arg5 = (int) (a5);
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#define LOAD_REGS_5 \
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register int _d5 asm ("d5") = __arg5; \
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LOAD_REGS_4
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#define ASM_ARGS_5 ASM_ARGS_4, "d" (_d5)
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#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
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LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
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int __arg6 = (int) (a6);
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#define LOAD_REGS_6 \
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register int _a0 asm ("a0") = __arg6; \
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LOAD_REGS_5
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#define ASM_ARGS_6 ASM_ARGS_5, "a" (_a0)
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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 /* not __ASSEMBLER__ */
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/* Pointer mangling is not yet supported for M68K. */
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#define PTR_MANGLE(var) (void) (var)
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#define PTR_DEMANGLE(var) (void) (var)
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#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
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/* M68K needs system-supplied DSO to access TLS helpers
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even when statically linked. */
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# define NEED_STATIC_SYSINFO_DSO 1
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#endif
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