![Greg Kroah-Hartman](/assets/img/avatar_default.png)
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>
238 lines
6.7 KiB
ArmAsm
238 lines
6.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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/*
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* Function: v4t_late_abort
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*
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* Params : r2 = pt_regs
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* : r4 = aborted context pc
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* : r5 = aborted context psr
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*
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* Returns : r4-r5, r9-r11, r13 preserved
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*
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* Purpose : obtain information about current aborted instruction.
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* Note: we read user space. This means we might cause a data
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* abort here if the I-TLB and D-TLB aren't seeing the same
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* picture. Unfortunately, this does happen. We live with it.
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*/
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ENTRY(v4t_late_abort)
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tst r5, #PSR_T_BIT @ check for thumb mode
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#ifdef CONFIG_CPU_CP15_MMU
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mrc p15, 0, r1, c5, c0, 0 @ get FSR
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mrc p15, 0, r0, c6, c0, 0 @ get FAR
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bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
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#else
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mov r0, #0 @ clear r0, r1 (no FSR/FAR)
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mov r1, #0
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#endif
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bne .data_thumb_abort
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ldr r8, [r4] @ read arm instruction
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uaccess_disable ip @ disable userspace access
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tst r8, #1 << 20 @ L = 1 -> write?
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orreq r1, r1, #1 << 11 @ yes.
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and r7, r8, #15 << 24
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add pc, pc, r7, lsr #22 @ Now branch to the relevant processing routine
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nop
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/* 0 */ b .data_arm_lateldrhpost @ ldrh rd, [rn], #m/rm
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/* 1 */ b .data_arm_lateldrhpre @ ldrh rd, [rn, #m/rm]
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/* 2 */ b .data_unknown
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/* 3 */ b .data_unknown
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/* 4 */ b .data_arm_lateldrpostconst @ ldr rd, [rn], #m
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/* 5 */ b .data_arm_lateldrpreconst @ ldr rd, [rn, #m]
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/* 6 */ b .data_arm_lateldrpostreg @ ldr rd, [rn], rm
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/* 7 */ b .data_arm_lateldrprereg @ ldr rd, [rn, rm]
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/* 8 */ b .data_arm_ldmstm @ ldm*a rn, <rlist>
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/* 9 */ b .data_arm_ldmstm @ ldm*b rn, <rlist>
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/* a */ b .data_unknown
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/* b */ b .data_unknown
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/* c */ b do_DataAbort @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
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/* d */ b do_DataAbort @ ldc rd, [rn, #m]
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/* e */ b .data_unknown
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/* f */ b .data_unknown
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.data_unknown_r9:
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ldr r9, [sp], #4
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.data_unknown: @ Part of jumptable
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mov r0, r4
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mov r1, r8
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b baddataabort
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.data_arm_ldmstm:
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tst r8, #1 << 21 @ check writeback bit
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beq do_DataAbort @ no writeback -> no fixup
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str r9, [sp, #-4]!
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mov r7, #0x11
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orr r7, r7, #0x1100
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and r6, r8, r7
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and r9, r8, r7, lsl #1
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add r6, r6, r9, lsr #1
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and r9, r8, r7, lsl #2
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add r6, r6, r9, lsr #2
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and r9, r8, r7, lsl #3
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add r6, r6, r9, lsr #3
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add r6, r6, r6, lsr #8
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add r6, r6, r6, lsr #4
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and r6, r6, #15 @ r6 = no. of registers to transfer.
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and r9, r8, #15 << 16 @ Extract 'n' from instruction
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ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
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tst r8, #1 << 23 @ Check U bit
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subne r7, r7, r6, lsl #2 @ Undo increment
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addeq r7, r7, r6, lsl #2 @ Undo decrement
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str r7, [r2, r9, lsr #14] @ Put register 'Rn'
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ldr r9, [sp], #4
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b do_DataAbort
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.data_arm_lateldrhpre:
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tst r8, #1 << 21 @ Check writeback bit
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beq do_DataAbort @ No writeback -> no fixup
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.data_arm_lateldrhpost:
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str r9, [sp, #-4]!
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and r9, r8, #0x00f @ get Rm / low nibble of immediate value
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tst r8, #1 << 22 @ if (immediate offset)
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andne r6, r8, #0xf00 @ { immediate high nibble
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orrne r6, r9, r6, lsr #4 @ combine nibbles } else
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ldreq r6, [r2, r9, lsl #2] @ { load Rm value }
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.data_arm_apply_r6_and_rn:
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and r9, r8, #15 << 16 @ Extract 'n' from instruction
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ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
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tst r8, #1 << 23 @ Check U bit
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subne r7, r7, r6 @ Undo incrmenet
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addeq r7, r7, r6 @ Undo decrement
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str r7, [r2, r9, lsr #14] @ Put register 'Rn'
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ldr r9, [sp], #4
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b do_DataAbort
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.data_arm_lateldrpreconst:
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tst r8, #1 << 21 @ check writeback bit
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beq do_DataAbort @ no writeback -> no fixup
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.data_arm_lateldrpostconst:
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movs r6, r8, lsl #20 @ Get offset
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beq do_DataAbort @ zero -> no fixup
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str r9, [sp, #-4]!
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and r9, r8, #15 << 16 @ Extract 'n' from instruction
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ldr r7, [r2, r9, lsr #14] @ Get register 'Rn'
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tst r8, #1 << 23 @ Check U bit
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subne r7, r7, r6, lsr #20 @ Undo increment
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addeq r7, r7, r6, lsr #20 @ Undo decrement
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str r7, [r2, r9, lsr #14] @ Put register 'Rn'
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ldr r9, [sp], #4
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b do_DataAbort
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.data_arm_lateldrprereg:
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tst r8, #1 << 21 @ check writeback bit
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beq do_DataAbort @ no writeback -> no fixup
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.data_arm_lateldrpostreg:
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and r7, r8, #15 @ Extract 'm' from instruction
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ldr r6, [r2, r7, lsl #2] @ Get register 'Rm'
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str r9, [sp, #-4]!
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mov r9, r8, lsr #7 @ get shift count
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ands r9, r9, #31
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and r7, r8, #0x70 @ get shift type
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orreq r7, r7, #8 @ shift count = 0
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add pc, pc, r7
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nop
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mov r6, r6, lsl r9 @ 0: LSL #!0
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b .data_arm_apply_r6_and_rn
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b .data_arm_apply_r6_and_rn @ 1: LSL #0
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nop
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b .data_unknown_r9 @ 2: MUL?
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nop
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b .data_unknown_r9 @ 3: MUL?
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nop
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mov r6, r6, lsr r9 @ 4: LSR #!0
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b .data_arm_apply_r6_and_rn
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mov r6, r6, lsr #32 @ 5: LSR #32
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b .data_arm_apply_r6_and_rn
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b .data_unknown_r9 @ 6: MUL?
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nop
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b .data_unknown_r9 @ 7: MUL?
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nop
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mov r6, r6, asr r9 @ 8: ASR #!0
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b .data_arm_apply_r6_and_rn
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mov r6, r6, asr #32 @ 9: ASR #32
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b .data_arm_apply_r6_and_rn
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b .data_unknown_r9 @ A: MUL?
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nop
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b .data_unknown_r9 @ B: MUL?
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nop
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mov r6, r6, ror r9 @ C: ROR #!0
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b .data_arm_apply_r6_and_rn
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mov r6, r6, rrx @ D: RRX
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b .data_arm_apply_r6_and_rn
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b .data_unknown_r9 @ E: MUL?
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nop
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b .data_unknown_r9 @ F: MUL?
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.data_thumb_abort:
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ldrh r8, [r4] @ read instruction
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uaccess_disable ip @ disable userspace access
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tst r8, #1 << 11 @ L = 1 -> write?
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orreq r1, r1, #1 << 8 @ yes
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and r7, r8, #15 << 12
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add pc, pc, r7, lsr #10 @ lookup in table
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nop
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/* 0 */ b .data_unknown
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/* 1 */ b .data_unknown
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/* 2 */ b .data_unknown
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/* 3 */ b .data_unknown
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/* 4 */ b .data_unknown
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/* 5 */ b .data_thumb_reg
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/* 6 */ b do_DataAbort
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/* 7 */ b do_DataAbort
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/* 8 */ b do_DataAbort
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/* 9 */ b do_DataAbort
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/* A */ b .data_unknown
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/* B */ b .data_thumb_pushpop
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/* C */ b .data_thumb_ldmstm
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/* D */ b .data_unknown
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/* E */ b .data_unknown
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/* F */ b .data_unknown
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.data_thumb_reg:
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tst r8, #1 << 9
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beq do_DataAbort
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tst r8, #1 << 10 @ If 'S' (signed) bit is set
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movne r1, #0 @ it must be a load instr
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b do_DataAbort
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.data_thumb_pushpop:
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tst r8, #1 << 10
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beq .data_unknown
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str r9, [sp, #-4]!
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and r6, r8, #0x55 @ hweight8(r8) + R bit
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and r9, r8, #0xaa
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add r6, r6, r9, lsr #1
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and r9, r6, #0xcc
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and r6, r6, #0x33
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add r6, r6, r9, lsr #2
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movs r7, r8, lsr #9 @ C = r8 bit 8 (R bit)
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adc r6, r6, r6, lsr #4 @ high + low nibble + R bit
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and r6, r6, #15 @ number of regs to transfer
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ldr r7, [r2, #13 << 2]
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tst r8, #1 << 11
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addeq r7, r7, r6, lsl #2 @ increment SP if PUSH
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subne r7, r7, r6, lsl #2 @ decrement SP if POP
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str r7, [r2, #13 << 2]
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ldr r9, [sp], #4
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b do_DataAbort
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.data_thumb_ldmstm:
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str r9, [sp, #-4]!
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and r6, r8, #0x55 @ hweight8(r8)
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and r9, r8, #0xaa
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add r6, r6, r9, lsr #1
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and r9, r6, #0xcc
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and r6, r6, #0x33
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add r6, r6, r9, lsr #2
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add r6, r6, r6, lsr #4
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and r9, r8, #7 << 8
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ldr r7, [r2, r9, lsr #6]
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and r6, r6, #15 @ number of regs to transfer
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sub r7, r7, r6, lsl #2 @ always decrement
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str r7, [r2, r9, lsr #6]
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ldr r9, [sp], #4
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b do_DataAbort
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