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linux/arch/m32r/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

554 lines
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/arch/m32r/kernel/entry.S
*
* Copyright (c) 2001, 2002 Hirokazu Takata, Hitoshi Yamamoto, H. Kondo
* Copyright (c) 2003 Hitoshi Yamamoto
* Copyright (c) 2004 Hirokazu Takata <takata at linux-m32r.org>
*
* Taken from i386 version.
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/*
* entry.S contains the system-call and fault low-level handling routines.
* This also contains the timer-interrupt handler, as well as all interrupts
* and faults that can result in a task-switch.
*
* NOTE: This code handles signal-recognition, which happens every time
* after a timer-interrupt and after each system call.
*
* Stack layout in 'ret_from_system_call':
* ptrace needs to have all regs on the stack.
* if the order here is changed, it needs to be
* updated in fork.c:copy_thread, signal.c:do_signal,
* ptrace.c and ptrace.h
*
* M32R/M32Rx/M32R2
* @(sp) - r4
* @(0x04,sp) - r5
* @(0x08,sp) - r6
* @(0x0c,sp) - *pt_regs
* @(0x10,sp) - r0
* @(0x14,sp) - r1
* @(0x18,sp) - r2
* @(0x1c,sp) - r3
* @(0x20,sp) - r7
* @(0x24,sp) - r8
* @(0x28,sp) - r9
* @(0x2c,sp) - r10
* @(0x30,sp) - r11
* @(0x34,sp) - r12
* @(0x38,sp) - syscall_nr
* @(0x3c,sp) - acc0h
* @(0x40,sp) - acc0l
* @(0x44,sp) - acc1h ; ISA_DSP_LEVEL2 only
* @(0x48,sp) - acc1l ; ISA_DSP_LEVEL2 only
* @(0x4c,sp) - psw
* @(0x50,sp) - bpc
* @(0x54,sp) - bbpsw
* @(0x58,sp) - bbpc
* @(0x5c,sp) - spu (cr3)
* @(0x60,sp) - fp (r13)
* @(0x64,sp) - lr (r14)
* @(0x68,sp) - spi (cr2)
* @(0x6c,sp) - orig_r0
*/
#include <linux/linkage.h>
#include <asm/irq.h>
#include <asm/unistd.h>
#include <asm/assembler.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
#include <asm/segment.h>
#include <asm/smp.h>
#include <asm/page.h>
#include <asm/m32r.h>
#include <asm/mmu_context.h>
#include <asm/asm-offsets.h>
#if !defined(CONFIG_MMU)
#define sys_madvise sys_ni_syscall
#define sys_readahead sys_ni_syscall
#define sys_mprotect sys_ni_syscall
#define sys_msync sys_ni_syscall
#define sys_mlock sys_ni_syscall
#define sys_munlock sys_ni_syscall
#define sys_mlockall sys_ni_syscall
#define sys_munlockall sys_ni_syscall
#define sys_mremap sys_ni_syscall
#define sys_mincore sys_ni_syscall
#define sys_remap_file_pages sys_ni_syscall
#endif /* CONFIG_MMU */
#define R4(reg) @reg
#define R5(reg) @(0x04,reg)
#define R6(reg) @(0x08,reg)
#define PTREGS(reg) @(0x0C,reg)
#define R0(reg) @(0x10,reg)
#define R1(reg) @(0x14,reg)
#define R2(reg) @(0x18,reg)
#define R3(reg) @(0x1C,reg)
#define R7(reg) @(0x20,reg)
#define R8(reg) @(0x24,reg)
#define R9(reg) @(0x28,reg)
#define R10(reg) @(0x2C,reg)
#define R11(reg) @(0x30,reg)
#define R12(reg) @(0x34,reg)
#define SYSCALL_NR(reg) @(0x38,reg)
#define ACC0H(reg) @(0x3C,reg)
#define ACC0L(reg) @(0x40,reg)
#define ACC1H(reg) @(0x44,reg)
#define ACC1L(reg) @(0x48,reg)
#define PSW(reg) @(0x4C,reg)
#define BPC(reg) @(0x50,reg)
#define BBPSW(reg) @(0x54,reg)
#define BBPC(reg) @(0x58,reg)
#define SPU(reg) @(0x5C,reg)
#define FP(reg) @(0x60,reg) /* FP = R13 */
#define LR(reg) @(0x64,reg)
#define SP(reg) @(0x68,reg)
#define ORIG_R0(reg) @(0x6C,reg)
#define nr_syscalls ((syscall_table_size)/4)
#ifdef CONFIG_PREEMPT
#define preempt_stop(x) DISABLE_INTERRUPTS(x)
#else
#define preempt_stop(x)
#define resume_kernel restore_all
#endif
/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
.macro GET_THREAD_INFO reg
ldi \reg, #-THREAD_SIZE
and \reg, sp
.endm
ENTRY(ret_from_kernel_thread)
pop r0
bl schedule_tail
GET_THREAD_INFO(r8)
ld r0, R0(r8)
ld r1, R1(r8)
jl r1
bra syscall_exit
ENTRY(ret_from_fork)
pop r0
bl schedule_tail
GET_THREAD_INFO(r8)
bra syscall_exit
/*
* Return to user mode is not as complex as all this looks,
* but we want the default path for a system call return to
* go as quickly as possible which is why some of this is
* less clear than it otherwise should be.
*/
; userspace resumption stub bypassing syscall exit tracing
ALIGN
ret_from_exception:
preempt_stop(r4)
ret_from_intr:
ld r4, PSW(sp)
#ifdef CONFIG_ISA_M32R2
and3 r4, r4, #0x8800 ; check BSM and BPM bits
#else
and3 r4, r4, #0x8000 ; check BSM bit
#endif
beqz r4, resume_kernel
resume_userspace:
DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
; setting need_resched or sigpending
; between sampling and the iret
GET_THREAD_INFO(r8)
ld r9, @(TI_FLAGS, r8)
and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done on
; int/exception return?
bnez r4, work_pending
bra restore_all
#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
GET_THREAD_INFO(r8)
ld r9, @(TI_PRE_COUNT, r8) ; non-zero preempt_count ?
bnez r9, restore_all
need_resched:
ld r9, @(TI_FLAGS, r8) ; need_resched set ?
and3 r4, r9, #_TIF_NEED_RESCHED
beqz r4, restore_all
ld r4, PSW(sp) ; interrupts off (exception path) ?
and3 r4, r4, #0x4000
beqz r4, restore_all
bl preempt_schedule_irq
bra need_resched
#endif
; system call handler stub
ENTRY(system_call)
SWITCH_TO_KERNEL_STACK
SAVE_ALL
ENABLE_INTERRUPTS(r4) ; Enable interrupt
st sp, PTREGS(sp) ; implicit pt_regs parameter
cmpui r7, #NR_syscalls
bnc syscall_badsys
st r7, SYSCALL_NR(sp) ; syscall_nr
; system call tracing in operation
GET_THREAD_INFO(r8)
ld r9, @(TI_FLAGS, r8)
and3 r4, r9, #_TIF_SYSCALL_TRACE
bnez r4, syscall_trace_entry
syscall_call:
slli r7, #2 ; table jump for the system call
LDIMM (r4, sys_call_table)
add r7, r4
ld r7, @r7
jl r7 ; execute system call
st r0, R0(sp) ; save the return value
syscall_exit:
DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
; setting need_resched or sigpending
; between sampling and the iret
ld r9, @(TI_FLAGS, r8)
and3 r4, r9, #_TIF_ALLWORK_MASK ; current->work
bnez r4, syscall_exit_work
restore_all:
RESTORE_ALL
# perform work that needs to be done immediately before resumption
# r9 : flags
ALIGN
work_pending:
and3 r4, r9, #_TIF_NEED_RESCHED
beqz r4, work_notifysig
work_resched:
bl schedule
DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
; setting need_resched or sigpending
; between sampling and the iret
ld r9, @(TI_FLAGS, r8)
and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done other
; than syscall tracing?
beqz r4, restore_all
and3 r4, r4, #_TIF_NEED_RESCHED
bnez r4, work_resched
work_notifysig: ; deal with pending signals and
; notify-resume requests
mv r0, sp ; arg1 : struct pt_regs *regs
mv r1, r9 ; arg2 : __u32 thread_info_flags
bl do_notify_resume
bra resume_userspace
; perform syscall exit tracing
ALIGN
syscall_trace_entry:
ldi r4, #-ENOSYS
st r4, R0(sp)
bl do_syscall_trace
ld r0, ORIG_R0(sp)
ld r1, R1(sp)
ld r2, R2(sp)
ld r3, R3(sp)
ld r4, R4(sp)
ld r5, R5(sp)
ld r6, R6(sp)
ld r7, SYSCALL_NR(sp)
cmpui r7, #NR_syscalls
bc syscall_call
bra syscall_exit
; perform syscall exit tracing
ALIGN
syscall_exit_work:
ld r9, @(TI_FLAGS, r8)
and3 r4, r9, #_TIF_SYSCALL_TRACE
beqz r4, work_pending
ENABLE_INTERRUPTS(r4) ; could let do_syscall_trace() call
; schedule() instead
bl do_syscall_trace
bra resume_userspace
ALIGN
syscall_fault:
SAVE_ALL
GET_THREAD_INFO(r8)
ldi r4, #-EFAULT
st r4, R0(sp)
bra resume_userspace
ALIGN
syscall_badsys:
ldi r4, #-ENOSYS
st r4, R0(sp)
bra resume_userspace
.global eit_vector
.equ ei_vec_table, eit_vector + 0x0200
/*
* EI handler routine
*/
ENTRY(ei_handler)
#if defined(CONFIG_CHIP_M32700)
; WORKAROUND: force to clear SM bit and use the kernel stack (SPI).
SWITCH_TO_KERNEL_STACK
#endif
SAVE_ALL
mv r1, sp ; arg1(regs)
; get ICU status
seth r0, #shigh(M32R_ICU_ISTS_ADDR)
ld r0, @(low(M32R_ICU_ISTS_ADDR),r0)
push r0
#if defined(CONFIG_SMP)
/*
* If IRQ == 0 --> Nothing to do, Not write IMASK
* If IRQ == IPI --> Do IPI handler, Not write IMASK
* If IRQ != 0, IPI --> Do do_IRQ(), Write IMASK
*/
slli r0, #4
srli r0, #24 ; r0(irq_num<<2)
;; IRQ exist check
#if defined(CONFIG_CHIP_M32700)
/* WORKAROUND: IMASK bug M32700-TS1, TS2 chip. */
bnez r0, 0f
ld24 r14, #0x00070000
seth r0, #shigh(M32R_ICU_IMASK_ADDR)
st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
bra 1f
.fillinsn
0:
#endif /* CONFIG_CHIP_M32700 */
beqz r0, 1f ; if (!irq_num) goto exit
;; IPI check
cmpi r0, #(M32R_IRQ_IPI0<<2) ; ISN < IPI0 check
bc 2f
cmpi r0, #((M32R_IRQ_IPI7+1)<<2) ; ISN > IPI7 check
bnc 2f
LDIMM (r2, ei_vec_table)
add r2, r0
ld r2, @r2
beqz r2, 1f ; if (no IPI handler) goto exit
mv r0, r1 ; arg0(regs)
jl r2
.fillinsn
1:
addi sp, #4
bra restore_all
.fillinsn
2:
srli r0, #2
#else /* not CONFIG_SMP */
srli r0, #22 ; r0(irq)
#endif /* not CONFIG_SMP */
#if defined(CONFIG_PLAT_HAS_INT1ICU)
add3 r2, r0, #-(M32R_IRQ_INT1) ; INT1# interrupt
bnez r2, 3f
seth r0, #shigh(M32R_INT1ICU_ISTS)
lduh r0, @(low(M32R_INT1ICU_ISTS),r0) ; bit10-6 : ISN
slli r0, #21
srli r0, #27 ; ISN
addi r0, #(M32R_INT1ICU_IRQ_BASE)
bra check_end
.fillinsn
3:
#endif /* CONFIG_PLAT_HAS_INT1ICU */
#if defined(CONFIG_PLAT_HAS_INT0ICU)
add3 r2, r0, #-(M32R_IRQ_INT0) ; INT0# interrupt
bnez r2, 4f
seth r0, #shigh(M32R_INT0ICU_ISTS)
lduh r0, @(low(M32R_INT0ICU_ISTS),r0) ; bit10-6 : ISN
slli r0, #21
srli r0, #27 ; ISN
add3 r0, r0, #(M32R_INT0ICU_IRQ_BASE)
bra check_end
.fillinsn
4:
#endif /* CONFIG_PLAT_HAS_INT0ICU */
#if defined(CONFIG_PLAT_HAS_INT2ICU)
add3 r2, r0, #-(M32R_IRQ_INT2) ; INT2# interrupt
bnez r2, 5f
seth r0, #shigh(M32R_INT2ICU_ISTS)
lduh r0, @(low(M32R_INT2ICU_ISTS),r0) ; bit10-6 : ISN
slli r0, #21
srli r0, #27 ; ISN
add3 r0, r0, #(M32R_INT2ICU_IRQ_BASE)
; bra check_end
.fillinsn
5:
#endif /* CONFIG_PLAT_HAS_INT2ICU */
check_end:
bl do_IRQ
pop r14
seth r0, #shigh(M32R_ICU_IMASK_ADDR)
st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
bra ret_from_intr
/*
* Default EIT handler
*/
ALIGN
int_msg:
.asciz "Unknown interrupt\n"
.byte 0
ENTRY(default_eit_handler)
push r0
mvfc r0, psw
push r1
push r2
push r3
push r0
LDIMM (r0, __KERNEL_DS)
mv r0, r1
mv r0, r2
LDIMM (r0, int_msg)
bl printk
pop r0
pop r3
pop r2
pop r1
mvtc r0, psw
pop r0
infinit:
bra infinit
#ifdef CONFIG_MMU
/*
* Access Exception handler
*/
ENTRY(ace_handler)
SWITCH_TO_KERNEL_STACK
SAVE_ALL
seth r2, #shigh(MMU_REG_BASE) /* Check status register */
ld r4, @(low(MESTS_offset),r2)
st r4, @(low(MESTS_offset),r2)
srl3 r1, r4, #4
#ifdef CONFIG_CHIP_M32700
and3 r1, r1, #0x0000ffff
; WORKAROUND: ignore TME bit for the M32700(TS1).
#endif /* CONFIG_CHIP_M32700 */
beqz r1, inst
oprand:
ld r2, @(low(MDEVA_offset),r2) ; set address
srli r1, #1
bra 1f
inst:
and3 r1, r4, #2
srli r1, #1
or3 r1, r1, #8
mvfc r2, bpc ; set address
.fillinsn
1:
mvfc r3, psw
mv r0, sp
and3 r3, r3, 0x800
srli r3, #9
or r1, r3
/*
* do_page_fault():
* r0 : struct pt_regs *regs
* r1 : unsigned long error-code
* r2 : unsigned long address
* error-code:
* +------+------+------+------+
* | bit3 | bit2 | bit1 | bit0 |
* +------+------+------+------+
* bit 3 == 0:means data, 1:means instruction
* bit 2 == 0:means kernel, 1:means user-mode
* bit 1 == 0:means read, 1:means write
* bit 0 == 0:means no page found 1:means protection fault
*
*/
bl do_page_fault
bra ret_from_intr
#endif /* CONFIG_MMU */
ENTRY(alignment_check)
/* void alignment_check(int error_code) */
SWITCH_TO_KERNEL_STACK
SAVE_ALL
ldi r1, #0x30 ; error_code
mv r0, sp ; pt_regs
bl do_alignment_check
error_code:
bra ret_from_exception
ENTRY(rie_handler)
/* void rie_handler(int error_code) */
SWITCH_TO_KERNEL_STACK
SAVE_ALL
ldi r1, #0x20 ; error_code
mv r0, sp ; pt_regs
bl do_rie_handler
bra error_code
ENTRY(pie_handler)
/* void pie_handler(int error_code) */
SWITCH_TO_KERNEL_STACK
SAVE_ALL
ldi r1, #0 ; error_code ; FIXME
mv r0, sp ; pt_regs
bl do_pie_handler
bra error_code
ENTRY(debug_trap)
/* void debug_trap(void) */
.global withdraw_debug_trap
SWITCH_TO_KERNEL_STACK
SAVE_ALL
mv r0, sp ; pt_regs
bl withdraw_debug_trap
ldi r1, #0 ; error_code
mv r0, sp ; pt_regs
bl do_debug_trap
bra error_code
ENTRY(ill_trap)
/* void ill_trap(void) */
SWITCH_TO_KERNEL_STACK
SAVE_ALL
ldi r1, #0 ; error_code ; FIXME
mv r0, sp ; pt_regs
bl do_ill_trap
bra error_code
ENTRY(cache_flushing_handler)
/* void _flush_cache_all(void); */
.global _flush_cache_all
SWITCH_TO_KERNEL_STACK
push r0
push r1
push r2
push r3
push r4
push r5
push r6
push r7
push lr
bl _flush_cache_all
pop lr
pop r7
pop r6
pop r5
pop r4
pop r3
pop r2
pop r1
pop r0
rte
.section .rodata,"a"
#include "syscall_table.S"
syscall_table_size=(.-sys_call_table)
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