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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>
283 lines
6.1 KiB
ArmAsm
283 lines
6.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/boot/head.S
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*
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* Copyright (C) 1991, 1992, 1993 Linus Torvalds
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*/
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/*
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* head.S contains the 32-bit startup code.
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*
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* NOTE!!! Startup happens at absolute address 0x00001000, which is also where
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* the page directory will exist. The startup code will be overwritten by
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* the page directory. [According to comments etc elsewhere on a compressed
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* kernel it will end up at 0x1000 + 1Mb I hope so as I assume this. - AC]
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*
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* Page 0 is deliberately kept safe, since System Management Mode code in
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* laptops may need to access the BIOS data stored there. This is also
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* useful for future device drivers that either access the BIOS via VM86
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* mode.
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*/
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/*
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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*/
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.text
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page_types.h>
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#include <asm/boot.h>
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#include <asm/asm-offsets.h>
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#include <asm/bootparam.h>
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/*
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* The 32-bit x86 assembler in binutils 2.26 will generate R_386_GOT32X
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* relocation to get the symbol address in PIC. When the compressed x86
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* kernel isn't built as PIC, the linker optimizes R_386_GOT32X
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* relocations to their fixed symbol addresses. However, when the
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* compressed x86 kernel is loaded at a different address, it leads
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* to the following load failure:
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*
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* Failed to allocate space for phdrs
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*
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* during the decompression stage.
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*
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* If the compressed x86 kernel is relocatable at run-time, it should be
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* compiled with -fPIE, instead of -fPIC, if possible and should be built as
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* Position Independent Executable (PIE) so that linker won't optimize
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* R_386_GOT32X relocation to its fixed symbol address. Older
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* linkers generate R_386_32 relocations against locally defined symbols,
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* _bss, _ebss, _got and _egot, in PIE. It isn't wrong, just less
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* optimal than R_386_RELATIVE. But the x86 kernel fails to properly handle
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* R_386_32 relocations when relocating the kernel. To generate
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* R_386_RELATIVE relocations, we mark _bss, _ebss, _got and _egot as
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* hidden:
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*/
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.hidden _bss
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.hidden _ebss
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.hidden _got
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.hidden _egot
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__HEAD
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ENTRY(startup_32)
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cld
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/*
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* Test KEEP_SEGMENTS flag to see if the bootloader is asking
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* us to not reload segments
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*/
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testb $KEEP_SEGMENTS, BP_loadflags(%esi)
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jnz 1f
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cli
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movl $__BOOT_DS, %eax
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %fs
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movl %eax, %gs
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movl %eax, %ss
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1:
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/*
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* Calculate the delta between where we were compiled to run
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* at and where we were actually loaded at. This can only be done
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* with a short local call on x86. Nothing else will tell us what
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* address we are running at. The reserved chunk of the real-mode
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* data at 0x1e4 (defined as a scratch field) are used as the stack
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* for this calculation. Only 4 bytes are needed.
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*/
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leal (BP_scratch+4)(%esi), %esp
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call 1f
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1: popl %ebp
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subl $1b, %ebp
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/*
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* %ebp contains the address we are loaded at by the boot loader and %ebx
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* contains the address where we should move the kernel image temporarily
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* for safe in-place decompression.
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*/
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#ifdef CONFIG_RELOCATABLE
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movl %ebp, %ebx
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movl BP_kernel_alignment(%esi), %eax
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decl %eax
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addl %eax, %ebx
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notl %eax
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andl %eax, %ebx
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cmpl $LOAD_PHYSICAL_ADDR, %ebx
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jge 1f
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#endif
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movl $LOAD_PHYSICAL_ADDR, %ebx
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1:
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/* Target address to relocate to for decompression */
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movl BP_init_size(%esi), %eax
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subl $_end, %eax
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addl %eax, %ebx
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/* Set up the stack */
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leal boot_stack_end(%ebx), %esp
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/* Zero EFLAGS */
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pushl $0
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popfl
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/*
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* Copy the compressed kernel to the end of our buffer
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* where decompression in place becomes safe.
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*/
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pushl %esi
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leal (_bss-4)(%ebp), %esi
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leal (_bss-4)(%ebx), %edi
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movl $(_bss - startup_32), %ecx
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shrl $2, %ecx
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std
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rep movsl
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cld
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popl %esi
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/*
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* Jump to the relocated address.
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*/
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leal relocated(%ebx), %eax
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jmp *%eax
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ENDPROC(startup_32)
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#ifdef CONFIG_EFI_STUB
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/*
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* We don't need the return address, so set up the stack so efi_main() can find
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* its arguments.
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*/
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ENTRY(efi_pe_entry)
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add $0x4, %esp
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call 1f
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1: popl %esi
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subl $1b, %esi
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popl %ecx
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movl %ecx, efi32_config(%esi) /* Handle */
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popl %ecx
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movl %ecx, efi32_config+8(%esi) /* EFI System table pointer */
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/* Relocate efi_config->call() */
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leal efi32_config(%esi), %eax
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add %esi, 40(%eax)
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pushl %eax
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call make_boot_params
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cmpl $0, %eax
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je fail
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movl %esi, BP_code32_start(%eax)
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popl %ecx
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pushl %eax
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pushl %ecx
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jmp 2f /* Skip efi_config initialization */
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ENDPROC(efi_pe_entry)
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ENTRY(efi32_stub_entry)
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add $0x4, %esp
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popl %ecx
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popl %edx
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call 1f
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1: popl %esi
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subl $1b, %esi
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movl %ecx, efi32_config(%esi) /* Handle */
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movl %edx, efi32_config+8(%esi) /* EFI System table pointer */
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/* Relocate efi_config->call() */
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leal efi32_config(%esi), %eax
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add %esi, 40(%eax)
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pushl %eax
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2:
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call efi_main
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cmpl $0, %eax
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movl %eax, %esi
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jne 2f
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fail:
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/* EFI init failed, so hang. */
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hlt
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jmp fail
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2:
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movl BP_code32_start(%esi), %eax
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leal startup_32(%eax), %eax
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jmp *%eax
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ENDPROC(efi32_stub_entry)
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#endif
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.text
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relocated:
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/*
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* Clear BSS (stack is currently empty)
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*/
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xorl %eax, %eax
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leal _bss(%ebx), %edi
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leal _ebss(%ebx), %ecx
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subl %edi, %ecx
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shrl $2, %ecx
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rep stosl
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/*
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* Adjust our own GOT
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*/
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leal _got(%ebx), %edx
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leal _egot(%ebx), %ecx
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1:
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cmpl %ecx, %edx
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jae 2f
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addl %ebx, (%edx)
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addl $4, %edx
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jmp 1b
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2:
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/*
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* Do the extraction, and jump to the new kernel..
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*/
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/* push arguments for extract_kernel: */
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pushl $z_output_len /* decompressed length, end of relocs */
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movl BP_init_size(%esi), %eax
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subl $_end, %eax
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movl %ebx, %ebp
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subl %eax, %ebp
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pushl %ebp /* output address */
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pushl $z_input_len /* input_len */
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leal input_data(%ebx), %eax
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pushl %eax /* input_data */
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leal boot_heap(%ebx), %eax
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pushl %eax /* heap area */
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pushl %esi /* real mode pointer */
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call extract_kernel /* returns kernel location in %eax */
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addl $24, %esp
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/*
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* Jump to the extracted kernel.
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*/
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xorl %ebx, %ebx
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jmp *%eax
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#ifdef CONFIG_EFI_STUB
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.data
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efi32_config:
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.fill 5,8,0
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.long efi_call_phys
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.long 0
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.byte 0
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#endif
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/*
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* Stack and heap for uncompression
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*/
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.bss
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.balign 4
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boot_heap:
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.fill BOOT_HEAP_SIZE, 1, 0
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boot_stack:
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.fill BOOT_STACK_SIZE, 1, 0
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boot_stack_end:
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