b24413180f
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>
367 lines
12 KiB
ArmAsm
367 lines
12 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* wof.S: Sparc window overflow handler.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/contregs.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/psr.h>
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#include <asm/smp.h>
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#include <asm/asi.h>
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#include <asm/winmacro.h>
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#include <asm/asmmacro.h>
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#include <asm/thread_info.h>
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/* WARNING: This routine is hairy and _very_ complicated, but it
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* must be as fast as possible as it handles the allocation
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* of register windows to the user and kernel. If you touch
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* this code be _very_ careful as many other pieces of the
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* kernel depend upon how this code behaves. You have been
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* duly warned...
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*/
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/* We define macro's for registers which have a fixed
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* meaning throughout this entire routine. The 'T' in
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* the comments mean that the register can only be
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* accessed when in the 'trap' window, 'G' means
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* accessible in any window. Do not change these registers
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* after they have been set, until you are ready to return
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* from the trap.
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*/
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#define t_psr l0 /* %psr at trap time T */
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#define t_pc l1 /* PC for trap return T */
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#define t_npc l2 /* NPC for trap return T */
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#define t_wim l3 /* %wim at trap time T */
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#define saved_g5 l5 /* Global save register T */
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#define saved_g6 l6 /* Global save register T */
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#define curptr g6 /* Gets set to 'current' then stays G */
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/* Now registers whose values can change within the handler. */
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#define twin_tmp l4 /* Temp reg, only usable in trap window T */
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#define glob_tmp g5 /* Global temporary reg, usable anywhere G */
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.text
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.align 4
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/* BEGINNING OF PATCH INSTRUCTIONS */
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/* On a 7-window Sparc the boot code patches spnwin_*
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* instructions with the following ones.
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*/
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.globl spnwin_patch1_7win, spnwin_patch2_7win, spnwin_patch3_7win
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spnwin_patch1_7win: sll %t_wim, 6, %glob_tmp
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spnwin_patch2_7win: and %glob_tmp, 0x7f, %glob_tmp
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spnwin_patch3_7win: and %twin_tmp, 0x7f, %twin_tmp
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/* END OF PATCH INSTRUCTIONS */
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/* The trap entry point has done the following:
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*
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* rd %psr, %l0
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* rd %wim, %l3
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* b spill_window_entry
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* andcc %l0, PSR_PS, %g0
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*/
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/* Datum current_thread_info->uwinmask contains at all times a bitmask
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* where if any user windows are active, at least one bit will
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* be set in to mask. If no user windows are active, the bitmask
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* will be all zeroes.
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*/
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.globl spill_window_entry
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.globl spnwin_patch1, spnwin_patch2, spnwin_patch3
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spill_window_entry:
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/* LOCATION: Trap Window */
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mov %g5, %saved_g5 ! save away global temp register
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mov %g6, %saved_g6 ! save away 'current' ptr register
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/* Compute what the new %wim will be if we save the
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* window properly in this trap handler.
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*
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* newwim = ((%wim>>1) | (%wim<<(nwindows - 1)));
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*/
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srl %t_wim, 0x1, %twin_tmp
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spnwin_patch1: sll %t_wim, 7, %glob_tmp
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or %glob_tmp, %twin_tmp, %glob_tmp
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spnwin_patch2: and %glob_tmp, 0xff, %glob_tmp
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/* The trap entry point has set the condition codes
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* up for us to see if this is from user or kernel.
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* Get the load of 'curptr' out of the way.
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*/
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LOAD_CURRENT(curptr, twin_tmp)
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andcc %t_psr, PSR_PS, %g0
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be,a spwin_fromuser ! all user wins, branch
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save %g0, %g0, %g0 ! Go where saving will occur
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/* See if any user windows are active in the set. */
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ld [%curptr + TI_UWINMASK], %twin_tmp ! grab win mask
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orcc %g0, %twin_tmp, %g0 ! check for set bits
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bne spwin_exist_uwins ! yep, there are some
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andn %twin_tmp, %glob_tmp, %twin_tmp ! compute new uwinmask
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/* Save into the window which must be saved and do it.
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* Basically if we are here, this means that we trapped
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* from kernel mode with only kernel windows in the register
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* file.
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*/
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save %g0, %g0, %g0 ! save into the window to stash away
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wr %glob_tmp, 0x0, %wim ! set new %wim, this is safe now
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spwin_no_userwins_from_kernel:
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/* LOCATION: Window to be saved */
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STORE_WINDOW(sp) ! stash the window
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restore %g0, %g0, %g0 ! go back into trap window
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/* LOCATION: Trap window */
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mov %saved_g5, %g5 ! restore %glob_tmp
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mov %saved_g6, %g6 ! restore %curptr
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wr %t_psr, 0x0, %psr ! restore condition codes in %psr
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WRITE_PAUSE ! waste some time
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jmp %t_pc ! Return from trap
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rett %t_npc ! we are done
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spwin_exist_uwins:
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/* LOCATION: Trap window */
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/* Wow, user windows have to be dealt with, this is dirty
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* and messy as all hell. And difficult to follow if you
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* are approaching the infamous register window trap handling
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* problem for the first time. DON'T LOOK!
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*
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* Note that how the execution path works out, the new %wim
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* will be left for us in the global temporary register,
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* %glob_tmp. We cannot set the new %wim first because we
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* need to save into the appropriate window without inducing
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* a trap (traps are off, we'd get a watchdog wheee)...
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* But first, store the new user window mask calculated
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* above.
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*/
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st %twin_tmp, [%curptr + TI_UWINMASK]
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save %g0, %g0, %g0 ! Go to where the saving will occur
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spwin_fromuser:
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/* LOCATION: Window to be saved */
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wr %glob_tmp, 0x0, %wim ! Now it is safe to set new %wim
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/* LOCATION: Window to be saved */
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/* This instruction branches to a routine which will check
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* to validity of the users stack pointer by whatever means
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* are necessary. This means that this is architecture
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* specific and thus this branch instruction will need to
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* be patched at boot time once the machine type is known.
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* This routine _shall not_ touch %curptr under any
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* circumstances whatsoever! It will branch back to the
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* label 'spwin_good_ustack' if the stack is ok but still
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* needs to be dumped (SRMMU for instance will not need to
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* do this) or 'spwin_finish_up' if the stack is ok and the
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* registers have already been saved. If the stack is found
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* to be bogus for some reason the routine shall branch to
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* the label 'spwin_user_stack_is_bolixed' which will take
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* care of things at that point.
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*/
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b spwin_srmmu_stackchk
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andcc %sp, 0x7, %g0
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spwin_good_ustack:
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/* LOCATION: Window to be saved */
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/* The users stack is ok and we can safely save it at
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* %sp.
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*/
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STORE_WINDOW(sp)
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spwin_finish_up:
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restore %g0, %g0, %g0 /* Back to trap window. */
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/* LOCATION: Trap window */
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/* We have spilled successfully, and we have properly stored
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* the appropriate window onto the stack.
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*/
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/* Restore saved globals */
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mov %saved_g5, %g5
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mov %saved_g6, %g6
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wr %t_psr, 0x0, %psr
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WRITE_PAUSE
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jmp %t_pc
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rett %t_npc
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spwin_user_stack_is_bolixed:
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/* LOCATION: Window to be saved */
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/* Wheee, user has trashed his/her stack. We have to decide
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* how to proceed based upon whether we came from kernel mode
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* or not. If we came from kernel mode, toss the window into
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* a special buffer and proceed, the kernel _needs_ a window
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* and we could be in an interrupt handler so timing is crucial.
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* If we came from user land we build a full stack frame and call
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* c-code to gun down the process.
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*/
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rd %psr, %glob_tmp
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andcc %glob_tmp, PSR_PS, %g0
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bne spwin_bad_ustack_from_kernel
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nop
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/* Oh well, throw this one window into the per-task window
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* buffer, the first one.
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*/
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st %sp, [%curptr + TI_RWIN_SPTRS]
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STORE_WINDOW(curptr + TI_REG_WINDOW)
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restore %g0, %g0, %g0
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/* LOCATION: Trap Window */
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/* Back in the trap window, update winbuffer save count. */
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mov 1, %twin_tmp
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st %twin_tmp, [%curptr + TI_W_SAVED]
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/* Compute new user window mask. What we are basically
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* doing is taking two windows, the invalid one at trap
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* time and the one we attempted to throw onto the users
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* stack, and saying that everything else is an ok user
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* window. umask = ((~(%t_wim | %wim)) & valid_wim_bits)
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*/
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rd %wim, %twin_tmp
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or %twin_tmp, %t_wim, %twin_tmp
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not %twin_tmp
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spnwin_patch3: and %twin_tmp, 0xff, %twin_tmp ! patched on 7win Sparcs
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st %twin_tmp, [%curptr + TI_UWINMASK]
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#define STACK_OFFSET (THREAD_SIZE - TRACEREG_SZ - STACKFRAME_SZ)
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sethi %hi(STACK_OFFSET), %sp
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or %sp, %lo(STACK_OFFSET), %sp
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add %curptr, %sp, %sp
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/* Restore the saved globals and build a pt_regs frame. */
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mov %saved_g5, %g5
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mov %saved_g6, %g6
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STORE_PT_ALL(sp, t_psr, t_pc, t_npc, g1)
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sethi %hi(STACK_OFFSET), %g6
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or %g6, %lo(STACK_OFFSET), %g6
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sub %sp, %g6, %g6 ! curptr
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/* Turn on traps and call c-code to deal with it. */
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wr %t_psr, PSR_ET, %psr
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nop
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call window_overflow_fault
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nop
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/* Return from trap if C-code actually fixes things, if it
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* doesn't then we never get this far as the process will
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* be given the look of death from Commander Peanut.
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*/
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b ret_trap_entry
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clr %l6
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spwin_bad_ustack_from_kernel:
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/* LOCATION: Window to be saved */
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/* The kernel provoked a spill window trap, but the window we
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* need to save is a user one and the process has trashed its
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* stack pointer. We need to be quick, so we throw it into
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* a per-process window buffer until we can properly handle
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* this later on.
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*/
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SAVE_BOLIXED_USER_STACK(curptr, glob_tmp)
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restore %g0, %g0, %g0
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/* LOCATION: Trap window */
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/* Restore globals, condition codes in the %psr and
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* return from trap. Note, restoring %g6 when returning
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* to kernel mode is not necessarily these days. ;-)
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*/
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mov %saved_g5, %g5
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mov %saved_g6, %g6
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wr %t_psr, 0x0, %psr
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WRITE_PAUSE
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jmp %t_pc
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rett %t_npc
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/* Undefine the register macros which would only cause trouble
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* if used below. This helps find 'stupid' coding errors that
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* produce 'odd' behavior. The routines below are allowed to
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* make usage of glob_tmp and t_psr so we leave them defined.
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*/
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#undef twin_tmp
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#undef curptr
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#undef t_pc
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#undef t_npc
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#undef t_wim
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#undef saved_g5
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#undef saved_g6
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/* Now come the per-architecture window overflow stack checking routines.
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* As noted above %curptr cannot be touched by this routine at all.
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*/
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/* This is a generic SRMMU routine. As far as I know this
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* works for all current v8/srmmu implementations, we'll
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* see...
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*/
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.globl spwin_srmmu_stackchk
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spwin_srmmu_stackchk:
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/* LOCATION: Window to be saved on the stack */
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/* Because of SMP concerns and speed we play a trick.
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* We disable fault traps in the MMU control register,
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* Execute the stores, then check the fault registers
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* to see what happens. I can hear Linus now
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* "disgusting... broken hardware...".
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*
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* But first, check to see if the users stack has ended
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* up in kernel vma, then we would succeed for the 'wrong'
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* reason... ;( Note that the 'sethi' below assumes the
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* kernel is page aligned, which should always be the case.
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*/
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/* Check results of callers andcc %sp, 0x7, %g0 */
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bne spwin_user_stack_is_bolixed
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sethi %hi(PAGE_OFFSET), %glob_tmp
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cmp %glob_tmp, %sp
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bleu spwin_user_stack_is_bolixed
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mov AC_M_SFSR, %glob_tmp
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/* Clear the fault status and turn on the no_fault bit. */
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LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %g0) ! eat SFSR
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SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %g0) ! eat SFSR
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LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %glob_tmp) ! read MMU control
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SUN_PI_(lda [%g0] ASI_M_MMUREGS, %glob_tmp) ! read MMU control
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or %glob_tmp, 0x2, %glob_tmp ! or in no_fault bit
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LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS) ! set it
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SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS) ! set it
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/* Dump the registers and cross fingers. */
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STORE_WINDOW(sp)
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/* Clear the no_fault bit and check the status. */
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andn %glob_tmp, 0x2, %glob_tmp
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LEON_PI(sta %glob_tmp, [%g0] ASI_LEON_MMUREGS)
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SUN_PI_(sta %glob_tmp, [%g0] ASI_M_MMUREGS)
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mov AC_M_SFAR, %glob_tmp
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LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %g0)
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SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %g0)
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mov AC_M_SFSR, %glob_tmp
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LEON_PI(lda [%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp)
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SUN_PI_(lda [%glob_tmp] ASI_M_MMUREGS, %glob_tmp)
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andcc %glob_tmp, 0x2, %g0 ! did we fault?
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be,a spwin_finish_up + 0x4 ! cool beans, success
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restore %g0, %g0, %g0
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rd %psr, %glob_tmp
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b spwin_user_stack_is_bolixed + 0x4 ! we faulted, ugh
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nop
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