License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2005-04-17 06:20:36 +08:00
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.file "div_Xsig.S"
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/*---------------------------------------------------------------------------+
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| div_Xsig.S |
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| Division subroutine for 96 bit quantities |
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| Copyright (C) 1994,1995 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@jacobi.maths.monash.edu.au |
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+---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------+
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| Divide the 96 bit quantity pointed to by a, by that pointed to by b, and |
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| put the 96 bit result at the location d. |
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| The result may not be accurate to 96 bits. It is intended for use where |
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| a result better than 64 bits is required. The result should usually be |
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| good to at least 94 bits. |
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| The returned result is actually divided by one half. This is done to |
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| prevent overflow. |
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| .aaaaaaaaaaaaaa / .bbbbbbbbbbbbb -> .dddddddddddd |
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| void div_Xsig(Xsig *a, Xsig *b, Xsig *dest) |
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+---------------------------------------------------------------------------*/
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#include "exception.h"
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#include "fpu_emu.h"
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#define XsigLL(x) (x)
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#define XsigL(x) 4(x)
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#define XsigH(x) 8(x)
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#ifndef NON_REENTRANT_FPU
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/*
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Local storage on the stack:
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Accumulator: FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
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*/
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#define FPU_accum_3 -4(%ebp)
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#define FPU_accum_2 -8(%ebp)
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#define FPU_accum_1 -12(%ebp)
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#define FPU_accum_0 -16(%ebp)
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#define FPU_result_3 -20(%ebp)
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#define FPU_result_2 -24(%ebp)
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#define FPU_result_1 -28(%ebp)
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#else
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.data
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/*
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Local storage in a static area:
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Accumulator: FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
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*/
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.align 4,0
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FPU_accum_3:
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.long 0
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FPU_accum_2:
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.long 0
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FPU_accum_1:
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.long 0
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FPU_accum_0:
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.long 0
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FPU_result_3:
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.long 0
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FPU_result_2:
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.long 0
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FPU_result_1:
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.long 0
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#endif /* NON_REENTRANT_FPU */
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.text
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2019-10-11 19:51:07 +08:00
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SYM_FUNC_START(div_Xsig)
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2005-04-17 06:20:36 +08:00
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pushl %ebp
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movl %esp,%ebp
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#ifndef NON_REENTRANT_FPU
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subl $28,%esp
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#endif /* NON_REENTRANT_FPU */
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pushl %esi
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pushl %edi
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pushl %ebx
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movl PARAM1,%esi /* pointer to num */
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movl PARAM2,%ebx /* pointer to denom */
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#ifdef PARANOID
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testl $0x80000000, XsigH(%ebx) /* Divisor */
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je L_bugged
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#endif /* PARANOID */
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/*---------------------------------------------------------------------------+
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| Divide: Return arg1/arg2 to arg3. |
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| |
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| The maximum returned value is (ignoring exponents) |
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| .ffffffff ffffffff |
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| ------------------ = 1.ffffffff fffffffe |
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| .80000000 00000000 |
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| and the minimum is |
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| .80000000 00000000 |
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| ------------------ = .80000000 00000001 (rounded) |
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| .ffffffff ffffffff |
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+---------------------------------------------------------------------------*/
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/* Save extended dividend in local register */
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/* Divide by 2 to prevent overflow */
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clc
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movl XsigH(%esi),%eax
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rcrl %eax
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movl %eax,FPU_accum_3
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movl XsigL(%esi),%eax
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rcrl %eax
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movl %eax,FPU_accum_2
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movl XsigLL(%esi),%eax
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rcrl %eax
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movl %eax,FPU_accum_1
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movl $0,%eax
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rcrl %eax
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movl %eax,FPU_accum_0
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movl FPU_accum_2,%eax /* Get the current num */
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movl FPU_accum_3,%edx
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/*----------------------------------------------------------------------*/
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/* Initialization done.
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Do the first 32 bits. */
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/* We will divide by a number which is too large */
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movl XsigH(%ebx),%ecx
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addl $1,%ecx
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jnc LFirst_div_not_1
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/* here we need to divide by 100000000h,
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i.e., no division at all.. */
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mov %edx,%eax
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jmp LFirst_div_done
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LFirst_div_not_1:
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divl %ecx /* Divide the numerator by the augmented
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denom ms dw */
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LFirst_div_done:
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movl %eax,FPU_result_3 /* Put the result in the answer */
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mull XsigH(%ebx) /* mul by the ms dw of the denom */
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subl %eax,FPU_accum_2 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_3
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movl FPU_result_3,%eax /* Get the result back */
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mull XsigL(%ebx) /* now mul the ls dw of the denom */
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subl %eax,FPU_accum_1 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_2
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sbbl $0,FPU_accum_3
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je LDo_2nd_32_bits /* Must check for non-zero result here */
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#ifdef PARANOID
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jb L_bugged_1
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#endif /* PARANOID */
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/* need to subtract another once of the denom */
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incl FPU_result_3 /* Correct the answer */
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movl XsigL(%ebx),%eax
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movl XsigH(%ebx),%edx
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subl %eax,FPU_accum_1 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_2
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#ifdef PARANOID
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sbbl $0,FPU_accum_3
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jne L_bugged_1 /* Must check for non-zero result here */
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#endif /* PARANOID */
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/*----------------------------------------------------------------------*/
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/* Half of the main problem is done, there is just a reduced numerator
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to handle now.
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Work with the second 32 bits, FPU_accum_0 not used from now on */
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LDo_2nd_32_bits:
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movl FPU_accum_2,%edx /* get the reduced num */
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movl FPU_accum_1,%eax
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/* need to check for possible subsequent overflow */
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cmpl XsigH(%ebx),%edx
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jb LDo_2nd_div
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ja LPrevent_2nd_overflow
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cmpl XsigL(%ebx),%eax
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jb LDo_2nd_div
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LPrevent_2nd_overflow:
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/* The numerator is greater or equal, would cause overflow */
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/* prevent overflow */
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subl XsigL(%ebx),%eax
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sbbl XsigH(%ebx),%edx
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movl %edx,FPU_accum_2
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movl %eax,FPU_accum_1
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incl FPU_result_3 /* Reflect the subtraction in the answer */
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#ifdef PARANOID
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je L_bugged_2 /* Can't bump the result to 1.0 */
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#endif /* PARANOID */
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LDo_2nd_div:
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cmpl $0,%ecx /* augmented denom msw */
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jnz LSecond_div_not_1
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/* %ecx == 0, we are dividing by 1.0 */
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mov %edx,%eax
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jmp LSecond_div_done
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LSecond_div_not_1:
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divl %ecx /* Divide the numerator by the denom ms dw */
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LSecond_div_done:
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movl %eax,FPU_result_2 /* Put the result in the answer */
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mull XsigH(%ebx) /* mul by the ms dw of the denom */
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subl %eax,FPU_accum_1 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_2
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#ifdef PARANOID
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jc L_bugged_2
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#endif /* PARANOID */
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movl FPU_result_2,%eax /* Get the result back */
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mull XsigL(%ebx) /* now mul the ls dw of the denom */
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subl %eax,FPU_accum_0 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_1 /* Subtract from the num local reg */
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sbbl $0,FPU_accum_2
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#ifdef PARANOID
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jc L_bugged_2
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#endif /* PARANOID */
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jz LDo_3rd_32_bits
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#ifdef PARANOID
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cmpl $1,FPU_accum_2
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jne L_bugged_2
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#endif /* PARANOID */
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/* need to subtract another once of the denom */
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movl XsigL(%ebx),%eax
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movl XsigH(%ebx),%edx
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subl %eax,FPU_accum_0 /* Subtract from the num local reg */
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sbbl %edx,FPU_accum_1
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sbbl $0,FPU_accum_2
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#ifdef PARANOID
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jc L_bugged_2
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jne L_bugged_2
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#endif /* PARANOID */
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addl $1,FPU_result_2 /* Correct the answer */
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adcl $0,FPU_result_3
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#ifdef PARANOID
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jc L_bugged_2 /* Must check for non-zero result here */
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#endif /* PARANOID */
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/*----------------------------------------------------------------------*/
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/* The division is essentially finished here, we just need to perform
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tidying operations.
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Deal with the 3rd 32 bits */
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LDo_3rd_32_bits:
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/* We use an approximation for the third 32 bits.
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To take account of the 3rd 32 bits of the divisor
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(call them del), we subtract del * (a/b) */
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movl FPU_result_3,%eax /* a/b */
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mull XsigLL(%ebx) /* del */
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subl %edx,FPU_accum_1
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/* A borrow indicates that the result is negative */
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jnb LTest_over
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movl XsigH(%ebx),%edx
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addl %edx,FPU_accum_1
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subl $1,FPU_result_2 /* Adjust the answer */
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sbbl $0,FPU_result_3
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|
|
|
|
|
/* The above addition might not have been enough, check again. */
|
|
|
|
movl FPU_accum_1,%edx /* get the reduced num */
|
|
|
|
cmpl XsigH(%ebx),%edx /* denom */
|
|
|
|
jb LDo_3rd_div
|
|
|
|
|
|
|
|
movl XsigH(%ebx),%edx
|
|
|
|
addl %edx,FPU_accum_1
|
|
|
|
|
|
|
|
subl $1,FPU_result_2 /* Adjust the answer */
|
|
|
|
sbbl $0,FPU_result_3
|
|
|
|
jmp LDo_3rd_div
|
|
|
|
|
|
|
|
LTest_over:
|
|
|
|
movl FPU_accum_1,%edx /* get the reduced num */
|
|
|
|
|
|
|
|
/* need to check for possible subsequent overflow */
|
|
|
|
cmpl XsigH(%ebx),%edx /* denom */
|
|
|
|
jb LDo_3rd_div
|
|
|
|
|
|
|
|
/* prevent overflow */
|
|
|
|
subl XsigH(%ebx),%edx
|
|
|
|
movl %edx,FPU_accum_1
|
|
|
|
|
|
|
|
addl $1,FPU_result_2 /* Reflect the subtraction in the answer */
|
|
|
|
adcl $0,FPU_result_3
|
|
|
|
|
|
|
|
LDo_3rd_div:
|
|
|
|
movl FPU_accum_0,%eax
|
|
|
|
movl FPU_accum_1,%edx
|
|
|
|
divl XsigH(%ebx)
|
|
|
|
|
|
|
|
movl %eax,FPU_result_1 /* Rough estimate of third word */
|
|
|
|
|
|
|
|
movl PARAM3,%esi /* pointer to answer */
|
|
|
|
|
|
|
|
movl FPU_result_1,%eax
|
|
|
|
movl %eax,XsigLL(%esi)
|
|
|
|
movl FPU_result_2,%eax
|
|
|
|
movl %eax,XsigL(%esi)
|
|
|
|
movl FPU_result_3,%eax
|
|
|
|
movl %eax,XsigH(%esi)
|
|
|
|
|
|
|
|
L_exit:
|
|
|
|
popl %ebx
|
|
|
|
popl %edi
|
|
|
|
popl %esi
|
|
|
|
|
|
|
|
leave
|
2021-12-04 21:43:40 +08:00
|
|
|
RET
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
|
|
|
#ifdef PARANOID
|
|
|
|
/* The logic is wrong if we got here */
|
|
|
|
L_bugged:
|
|
|
|
pushl EX_INTERNAL|0x240
|
|
|
|
call EXCEPTION
|
|
|
|
pop %ebx
|
|
|
|
jmp L_exit
|
|
|
|
|
|
|
|
L_bugged_1:
|
|
|
|
pushl EX_INTERNAL|0x241
|
|
|
|
call EXCEPTION
|
|
|
|
pop %ebx
|
|
|
|
jmp L_exit
|
|
|
|
|
|
|
|
L_bugged_2:
|
|
|
|
pushl EX_INTERNAL|0x242
|
|
|
|
call EXCEPTION
|
|
|
|
pop %ebx
|
|
|
|
jmp L_exit
|
|
|
|
#endif /* PARANOID */
|
2019-10-11 19:51:07 +08:00
|
|
|
SYM_FUNC_END(div_Xsig)
|