2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
1.8 KiB
ArmAsm
85 lines
1.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Access to the shared data page by the vDSO & syscall map
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*
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* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
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*/
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/vdso.h>
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.text
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.global __kernel_datapage_offset;
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__kernel_datapage_offset:
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.long 0
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V_FUNCTION_BEGIN(__get_datapage)
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.cfi_startproc
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/* We don't want that exposed or overridable as we want other objects
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* to be able to bl directly to here
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*/
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.protected __get_datapage
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.hidden __get_datapage
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mflr r0
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.cfi_register lr,r0
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bcl 20,31,data_page_branch
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data_page_branch:
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mflr r3
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mtlr r0
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addi r3, r3, __kernel_datapage_offset-data_page_branch
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lwz r0,0(r3)
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.cfi_restore lr
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add r3,r0,r3
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blr
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.cfi_endproc
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V_FUNCTION_END(__get_datapage)
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/*
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* void *__kernel_get_syscall_map(unsigned int *syscall_count) ;
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*
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* returns a pointer to the syscall map. the map is agnostic to the
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* size of "long", unlike kernel bitops, it stores bits from top to
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* bottom so that memory actually contains a linear bitmap
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* check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of
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* 32 bits int at N >> 5.
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*/
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V_FUNCTION_BEGIN(__kernel_get_syscall_map)
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.cfi_startproc
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mflr r12
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.cfi_register lr,r12
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mr r4,r3
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bl V_LOCAL_FUNC(__get_datapage)
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mtlr r12
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addi r3,r3,CFG_SYSCALL_MAP64
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cmpldi cr0,r4,0
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crclr cr0*4+so
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beqlr
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li r0,NR_syscalls
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stw r0,0(r4)
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_get_syscall_map)
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/*
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* void unsigned long __kernel_get_tbfreq(void);
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*
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* returns the timebase frequency in HZ
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*/
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V_FUNCTION_BEGIN(__kernel_get_tbfreq)
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.cfi_startproc
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mflr r12
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.cfi_register lr,r12
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bl V_LOCAL_FUNC(__get_datapage)
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ld r3,CFG_TB_TICKS_PER_SEC(r3)
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mtlr r12
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crclr cr0*4+so
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_get_tbfreq)
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