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linux-brain/arch/h8300/kernel/entry.S
Greg Kroah-Hartman b24413180f 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>
2017-11-02 11:10:55 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
*
* linux/arch/h8300/kernel/entry.S
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
* David McCullough <davidm@snapgear.com>
*
*/
/*
* entry.S
* include exception/interrupt gateway
* system call entry
*/
#include <linux/sys.h>
#include <asm/unistd.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
#if defined(CONFIG_CPU_H8300H)
#define USERRET 8
INTERRUPTS = 64
.h8300h
.macro SHLL2 reg
shll.l \reg
shll.l \reg
.endm
.macro SHLR2 reg
shlr.l \reg
shlr.l \reg
.endm
.macro SAVEREGS
mov.l er0,@-sp
mov.l er1,@-sp
mov.l er2,@-sp
mov.l er3,@-sp
.endm
.macro RESTOREREGS
mov.l @sp+,er3
mov.l @sp+,er2
.endm
.macro SAVEEXR
.endm
.macro RESTOREEXR
.endm
#endif
#if defined(CONFIG_CPU_H8S)
#define USERRET 10
#define USEREXR 8
INTERRUPTS = 128
.h8300s
.macro SHLL2 reg
shll.l #2,\reg
.endm
.macro SHLR2 reg
shlr.l #2,\reg
.endm
.macro SAVEREGS
stm.l er0-er3,@-sp
.endm
.macro RESTOREREGS
ldm.l @sp+,er2-er3
.endm
.macro SAVEEXR
mov.w @(USEREXR:16,er0),r1
mov.w r1,@(LEXR-LER3:16,sp) /* copy EXR */
.endm
.macro RESTOREEXR
mov.w @(LEXR-LER1:16,sp),r1 /* restore EXR */
mov.b r1l,r1h
mov.w r1,@(USEREXR:16,er0)
.endm
#endif
/* CPU context save/restore macros. */
.macro SAVE_ALL
mov.l er0,@-sp
stc ccr,r0l /* check kernel mode */
btst #4,r0l
bne 5f
/* user mode */
mov.l sp,@_sw_usp
mov.l @sp,er0 /* restore saved er0 */
orc #0x10,ccr /* switch kernel stack */
mov.l @_sw_ksp,sp
sub.l #(LRET-LORIG),sp /* allocate LORIG - LRET */
SAVEREGS
mov.l @_sw_usp,er0
mov.l @(USERRET:16,er0),er1 /* copy the RET addr */
mov.l er1,@(LRET-LER3:16,sp)
SAVEEXR
mov.l @(LORIG-LER3:16,sp),er0
mov.l er0,@(LER0-LER3:16,sp) /* copy ER0 */
mov.w e1,r1 /* e1 highbyte = ccr */
and #0xef,r1h /* mask mode? flag */
bra 6f
5:
/* kernel mode */
mov.l @sp,er0 /* restore saved er0 */
subs #2,sp /* set dummy ccr */
subs #4,sp /* set dummp sp */
SAVEREGS
mov.w @(LRET-LER3:16,sp),r1 /* copy old ccr */
6:
mov.b r1h,r1l
mov.b #0,r1h
mov.w r1,@(LCCR-LER3:16,sp) /* set ccr */
mov.l @_sw_usp,er2
mov.l er2,@(LSP-LER3:16,sp) /* set usp */
mov.l er6,@-sp /* syscall arg #6 */
mov.l er5,@-sp /* syscall arg #5 */
mov.l er4,@-sp /* syscall arg #4 */
.endm /* r1 = ccr */
.macro RESTORE_ALL
mov.l @sp+,er4
mov.l @sp+,er5
mov.l @sp+,er6
RESTOREREGS
mov.w @(LCCR-LER1:16,sp),r0 /* check kernel mode */
btst #4,r0l
bne 7f
orc #0xc0,ccr
mov.l @(LSP-LER1:16,sp),er0
mov.l @(LER0-LER1:16,sp),er1 /* restore ER0 */
mov.l er1,@er0
RESTOREEXR
mov.w @(LCCR-LER1:16,sp),r1 /* restore the RET addr */
mov.b r1l,r1h
mov.b @(LRET+1-LER1:16,sp),r1l
mov.w r1,e1
mov.w @(LRET+2-LER1:16,sp),r1
mov.l er1,@(USERRET:16,er0)
mov.l @sp+,er1
add.l #(LRET-LER1),sp /* remove LORIG - LRET */
mov.l sp,@_sw_ksp
andc #0xef,ccr /* switch to user mode */
mov.l er0,sp
bra 8f
7:
mov.l @sp+,er1
add.l #10,sp
8:
mov.l @sp+,er0
adds #4,sp /* remove the sw created LVEC */
rte
.endm
.globl _system_call
.globl ret_from_exception
.globl ret_from_fork
.globl ret_from_kernel_thread
.globl ret_from_interrupt
.globl _interrupt_redirect_table
.globl _sw_ksp,_sw_usp
.globl _resume
.globl _interrupt_entry
.globl _trace_break
.globl _nmi
#if defined(CONFIG_ROMKERNEL)
.section .int_redirect,"ax"
_interrupt_redirect_table:
#if defined(CONFIG_CPU_H8300H)
.rept 7
.long 0
.endr
#endif
#if defined(CONFIG_CPU_H8S)
.rept 5
.long 0
.endr
jmp @_trace_break
.long 0
#endif
jsr @_interrupt_entry /* NMI */
jmp @_system_call /* TRAPA #0 (System call) */
.long 0
#if defined(CONFIG_KGDB)
jmp @_kgdb_trap
#else
.long 0
#endif
jmp @_trace_break /* TRAPA #3 (breakpoint) */
.rept INTERRUPTS-12
jsr @_interrupt_entry
.endr
#endif
#if defined(CONFIG_RAMKERNEL)
.globl _interrupt_redirect_table
.section .bss
_interrupt_redirect_table:
.space 4
#endif
.section .text
.align 2
_interrupt_entry:
SAVE_ALL
/* r1l is saved ccr */
mov.l sp,er0
add.l #LVEC,er0
btst #4,r1l
bne 1f
/* user LVEC */
mov.l @_sw_usp,er0
adds #4,er0
1:
mov.l @er0,er0 /* LVEC address */
#if defined(CONFIG_ROMKERNEL)
sub.l #_interrupt_redirect_table,er0
#endif
#if defined(CONFIG_RAMKERNEL)
mov.l @_interrupt_redirect_table,er1
sub.l er1,er0
#endif
SHLR2 er0
dec.l #1,er0
mov.l sp,er1
subs #4,er1 /* adjust ret_pc */
#if defined(CONFIG_CPU_H8S)
orc #7,exr
#endif
jsr @do_IRQ
jmp @ret_from_interrupt
_system_call:
subs #4,sp /* dummy LVEC */
SAVE_ALL
/* er0: syscall nr */
andc #0xbf,ccr
mov.l er0,er4
/* save top of frame */
mov.l sp,er0
jsr @set_esp0
andc #0x3f,ccr
mov.l sp,er2
and.w #0xe000,r2
mov.l @(TI_FLAGS:16,er2),er2
and.w #_TIF_WORK_SYSCALL_MASK,r2
beq 1f
mov.l sp,er0
jsr @do_syscall_trace_enter
1:
cmp.l #__NR_syscalls,er4
bcc badsys
SHLL2 er4
mov.l #_sys_call_table,er0
add.l er4,er0
mov.l @er0,er4
beq ret_from_exception:16
mov.l @(LER1:16,sp),er0
mov.l @(LER2:16,sp),er1
mov.l @(LER3:16,sp),er2
jsr @er4
mov.l er0,@(LER0:16,sp) /* save the return value */
mov.l sp,er2
and.w #0xe000,r2
mov.l @(TI_FLAGS:16,er2),er2
and.w #_TIF_WORK_SYSCALL_MASK,r2
beq 2f
mov.l sp,er0
jsr @do_syscall_trace_leave
2:
orc #0xc0,ccr
bra resume_userspace
badsys:
mov.l #-ENOSYS,er0
mov.l er0,@(LER0:16,sp)
bra resume_userspace
#if !defined(CONFIG_PREEMPT)
#define resume_kernel restore_all
#endif
ret_from_exception:
#if defined(CONFIG_PREEMPT)
orc #0xc0,ccr
#endif
ret_from_interrupt:
mov.b @(LCCR+1:16,sp),r0l
btst #4,r0l
bne resume_kernel:16 /* return from kernel */
resume_userspace:
andc #0xbf,ccr
mov.l sp,er4
and.w #0xe000,r4 /* er4 <- current thread info */
mov.l @(TI_FLAGS:16,er4),er1
and.l #_TIF_WORK_MASK,er1
beq restore_all:8
work_pending:
btst #TIF_NEED_RESCHED,r1l
bne work_resched:8
/* work notifysig */
mov.l sp,er0
subs #4,er0 /* er0: pt_regs */
jsr @do_notify_resume
bra resume_userspace:8
work_resched:
mov.l sp,er0
jsr @set_esp0
jsr @schedule
bra resume_userspace:8
restore_all:
RESTORE_ALL /* Does RTE */
#if defined(CONFIG_PREEMPT)
resume_kernel:
mov.l @(TI_PRE_COUNT:16,er4),er0
bne restore_all:8
need_resched:
mov.l @(TI_FLAGS:16,er4),er0
btst #TIF_NEED_RESCHED,r0l
beq restore_all:8
mov.b @(LCCR+1:16,sp),r0l /* Interrupt Enabled? */
bmi restore_all:8
mov.l sp,er0
jsr @set_esp0
jsr @preempt_schedule_irq
bra need_resched:8
#endif
ret_from_fork:
mov.l er2,er0
jsr @schedule_tail
jmp @ret_from_exception
ret_from_kernel_thread:
mov.l er2,er0
jsr @schedule_tail
mov.l @(LER4:16,sp),er0
mov.l @(LER5:16,sp),er1
jsr @er1
jmp @ret_from_exception
_resume:
/*
* Beware - when entering resume, offset of tss is in d1,
* prev (the current task) is in a0, next (the new task)
* is in a1 and d2.b is non-zero if the mm structure is
* shared between the tasks, so don't change these
* registers until their contents are no longer needed.
*/
/* save sr */
sub.w r3,r3
stc ccr,r3l
mov.w r3,@(THREAD_CCR+2:16,er0)
/* disable interrupts */
orc #0xc0,ccr
mov.l @_sw_usp,er3
mov.l er3,@(THREAD_USP:16,er0)
mov.l sp,@(THREAD_KSP:16,er0)
/* Skip address space switching if they are the same. */
/* FIXME: what did we hack out of here, this does nothing! */
mov.l @(THREAD_USP:16,er1),er0
mov.l er0,@_sw_usp
mov.l @(THREAD_KSP:16,er1),sp
/* restore status register */
mov.w @(THREAD_CCR+2:16,er1),r3
ldc r3l,ccr
rts
_trace_break:
subs #4,sp
SAVE_ALL
sub.l er1,er1
dec.l #1,er1
mov.l er1,@(LORIG,sp)
mov.l sp,er0
jsr @set_esp0
mov.l @_sw_usp,er0
mov.l @er0,er1
mov.w @(-2:16,er1),r2
cmp.w #0x5730,r2
beq 1f
subs #2,er1
mov.l er1,@er0
1:
and.w #0xff,e1
mov.l er1,er0
jsr @trace_trap
jmp @ret_from_exception
_nmi:
subs #4, sp
mov.l er0, @-sp
mov.l @_interrupt_redirect_table, er0
add.l #8*4, er0
mov.l er0, @(4,sp)
mov.l @sp+, er0
jmp @_interrupt_entry
#if defined(CONFIG_KGDB)
_kgdb_trap:
subs #4,sp
SAVE_ALL
mov.l sp,er0
add.l #LRET,er0
mov.l er0,@(LSP,sp)
jsr @set_esp0
mov.l sp,er0
subs #4,er0
jsr @h8300_kgdb_trap
jmp @ret_from_exception
#endif
.section .bss
_sw_ksp:
.space 4
_sw_usp:
.space 4
.end
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