572 lines
12 KiB
C
572 lines
12 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm/include/asm/assembler.h
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*
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* Copyright (C) 1996-2000 Russell King
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*
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* This file contains arm architecture specific defines
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* for the different processors.
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*
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* Do not include any C declarations in this file - it is included by
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* assembler source.
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*/
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#ifndef __ASM_ASSEMBLER_H__
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#define __ASM_ASSEMBLER_H__
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#ifndef __ASSEMBLY__
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#error "Only include this from assembly code"
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#endif
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#include <asm/ptrace.h>
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#include <asm/domain.h>
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#include <asm/opcodes-virt.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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#define IOMEM(x) (x)
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/*
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* Endian independent macros for shifting bytes within registers.
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*/
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#ifndef __ARMEB__
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#define lspull lsr
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#define lspush lsl
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#define get_byte_0 lsl #0
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#define get_byte_1 lsr #8
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#define get_byte_2 lsr #16
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#define get_byte_3 lsr #24
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#define put_byte_0 lsl #0
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#define put_byte_1 lsl #8
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#define put_byte_2 lsl #16
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#define put_byte_3 lsl #24
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#else
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#define lspull lsl
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#define lspush lsr
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#define get_byte_0 lsr #24
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#define get_byte_1 lsr #16
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#define get_byte_2 lsr #8
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#define get_byte_3 lsl #0
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#define put_byte_0 lsl #24
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#define put_byte_1 lsl #16
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#define put_byte_2 lsl #8
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#define put_byte_3 lsl #0
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#endif
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/* Select code for any configuration running in BE8 mode */
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#ifdef CONFIG_CPU_ENDIAN_BE8
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#define ARM_BE8(code...) code
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#else
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#define ARM_BE8(code...)
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#endif
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/*
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* Data preload for architectures that support it
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*/
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#if __LINUX_ARM_ARCH__ >= 5
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#define PLD(code...) code
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#else
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#define PLD(code...)
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#endif
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/*
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* This can be used to enable code to cacheline align the destination
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* pointer when bulk writing to memory. Experiments on StrongARM and
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* XScale didn't show this a worthwhile thing to do when the cache is not
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* set to write-allocate (this would need further testing on XScale when WA
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* is used).
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*
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* On Feroceon there is much to gain however, regardless of cache mode.
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*/
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#ifdef CONFIG_CPU_FEROCEON
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#define CALGN(code...) code
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#else
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#define CALGN(code...)
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#endif
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#define IMM12_MASK 0xfff
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/*
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* Enable and disable interrupts
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*/
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#if __LINUX_ARM_ARCH__ >= 6
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.macro disable_irq_notrace
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cpsid i
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.endm
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.macro enable_irq_notrace
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cpsie i
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.endm
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#else
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.macro disable_irq_notrace
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msr cpsr_c, #PSR_I_BIT | SVC_MODE
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.endm
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.macro enable_irq_notrace
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msr cpsr_c, #SVC_MODE
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.endm
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#endif
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.macro asm_trace_hardirqs_off, save=1
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#if defined(CONFIG_TRACE_IRQFLAGS)
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.if \save
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stmdb sp!, {r0-r3, ip, lr}
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.endif
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bl trace_hardirqs_off
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.if \save
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ldmia sp!, {r0-r3, ip, lr}
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.endif
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#endif
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.endm
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.macro asm_trace_hardirqs_on, cond=al, save=1
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#if defined(CONFIG_TRACE_IRQFLAGS)
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/*
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* actually the registers should be pushed and pop'd conditionally, but
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* after bl the flags are certainly clobbered
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*/
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.if \save
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stmdb sp!, {r0-r3, ip, lr}
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.endif
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bl\cond trace_hardirqs_on
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.if \save
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ldmia sp!, {r0-r3, ip, lr}
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.endif
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#endif
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.endm
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.macro disable_irq, save=1
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disable_irq_notrace
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asm_trace_hardirqs_off \save
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.endm
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.macro enable_irq
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asm_trace_hardirqs_on
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enable_irq_notrace
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.endm
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/*
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* Save the current IRQ state and disable IRQs. Note that this macro
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* assumes FIQs are enabled, and that the processor is in SVC mode.
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*/
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.macro save_and_disable_irqs, oldcpsr
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#ifdef CONFIG_CPU_V7M
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mrs \oldcpsr, primask
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#else
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mrs \oldcpsr, cpsr
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#endif
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disable_irq
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.endm
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.macro save_and_disable_irqs_notrace, oldcpsr
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#ifdef CONFIG_CPU_V7M
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mrs \oldcpsr, primask
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#else
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mrs \oldcpsr, cpsr
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#endif
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disable_irq_notrace
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.endm
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/*
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* Restore interrupt state previously stored in a register. We don't
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* guarantee that this will preserve the flags.
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*/
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.macro restore_irqs_notrace, oldcpsr
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#ifdef CONFIG_CPU_V7M
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msr primask, \oldcpsr
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#else
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msr cpsr_c, \oldcpsr
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#endif
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.endm
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.macro restore_irqs, oldcpsr
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tst \oldcpsr, #PSR_I_BIT
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asm_trace_hardirqs_on cond=eq
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restore_irqs_notrace \oldcpsr
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.endm
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/*
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* Assembly version of "adr rd, BSYM(sym)". This should only be used to
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* reference local symbols in the same assembly file which are to be
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* resolved by the assembler. Other usage is undefined.
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*/
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.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
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.macro badr\c, rd, sym
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#ifdef CONFIG_THUMB2_KERNEL
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adr\c \rd, \sym + 1
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#else
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adr\c \rd, \sym
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#endif
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.endm
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.endr
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/*
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* Get current thread_info.
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*/
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.macro get_thread_info, rd
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ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT )
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THUMB( mov \rd, sp )
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THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT )
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mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT
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.endm
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/*
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* Increment/decrement the preempt count.
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*/
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#ifdef CONFIG_PREEMPT_COUNT
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.macro inc_preempt_count, ti, tmp
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ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count
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add \tmp, \tmp, #1 @ increment it
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str \tmp, [\ti, #TI_PREEMPT]
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.endm
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.macro dec_preempt_count, ti, tmp
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ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count
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sub \tmp, \tmp, #1 @ decrement it
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str \tmp, [\ti, #TI_PREEMPT]
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.endm
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.macro dec_preempt_count_ti, ti, tmp
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get_thread_info \ti
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dec_preempt_count \ti, \tmp
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.endm
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#else
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.macro inc_preempt_count, ti, tmp
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.endm
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.macro dec_preempt_count, ti, tmp
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.endm
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.macro dec_preempt_count_ti, ti, tmp
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.endm
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#endif
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#define USERL(l, x...) \
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9999: x; \
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.pushsection __ex_table,"a"; \
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.align 3; \
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.long 9999b,l; \
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.popsection
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#define USER(x...) USERL(9001f, x)
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#ifdef CONFIG_SMP
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#define ALT_SMP(instr...) \
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9998: instr
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/*
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* Note: if you get assembler errors from ALT_UP() when building with
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* CONFIG_THUMB2_KERNEL, you almost certainly need to use
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* ALT_SMP( W(instr) ... )
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*/
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#define ALT_UP(instr...) \
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.pushsection ".alt.smp.init", "a" ;\
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.long 9998b ;\
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9997: instr ;\
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.if . - 9997b == 2 ;\
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nop ;\
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.endif ;\
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.if . - 9997b != 4 ;\
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.error "ALT_UP() content must assemble to exactly 4 bytes";\
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.endif ;\
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.popsection
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#define ALT_UP_B(label) \
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.equ up_b_offset, label - 9998b ;\
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.pushsection ".alt.smp.init", "a" ;\
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.long 9998b ;\
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W(b) . + up_b_offset ;\
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.popsection
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#else
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#define ALT_SMP(instr...)
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#define ALT_UP(instr...) instr
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#define ALT_UP_B(label) b label
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#endif
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/*
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* Instruction barrier
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*/
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.macro instr_sync
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#if __LINUX_ARM_ARCH__ >= 7
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isb
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#elif __LINUX_ARM_ARCH__ == 6
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mcr p15, 0, r0, c7, c5, 4
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#endif
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.endm
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/*
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* SMP data memory barrier
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*/
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.macro smp_dmb mode
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#ifdef CONFIG_SMP
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#if __LINUX_ARM_ARCH__ >= 7
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.ifeqs "\mode","arm"
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ALT_SMP(dmb ish)
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.else
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ALT_SMP(W(dmb) ish)
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.endif
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#elif __LINUX_ARM_ARCH__ == 6
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ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb
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#else
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#error Incompatible SMP platform
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#endif
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.ifeqs "\mode","arm"
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ALT_UP(nop)
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.else
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ALT_UP(W(nop))
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.endif
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#endif
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.endm
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#if defined(CONFIG_CPU_V7M)
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/*
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* setmode is used to assert to be in svc mode during boot. For v7-M
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* this is done in __v7m_setup, so setmode can be empty here.
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*/
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.macro setmode, mode, reg
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.endm
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#elif defined(CONFIG_THUMB2_KERNEL)
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.macro setmode, mode, reg
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mov \reg, #\mode
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msr cpsr_c, \reg
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.endm
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#else
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.macro setmode, mode, reg
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msr cpsr_c, #\mode
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.endm
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#endif
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/*
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* Helper macro to enter SVC mode cleanly and mask interrupts. reg is
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* a scratch register for the macro to overwrite.
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*
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* This macro is intended for forcing the CPU into SVC mode at boot time.
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* you cannot return to the original mode.
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*/
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.macro safe_svcmode_maskall reg:req
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#if __LINUX_ARM_ARCH__ >= 6 && !defined(CONFIG_CPU_V7M)
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mrs \reg , cpsr
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eor \reg, \reg, #HYP_MODE
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tst \reg, #MODE_MASK
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bic \reg , \reg , #MODE_MASK
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orr \reg , \reg , #PSR_I_BIT | PSR_F_BIT | SVC_MODE
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THUMB( orr \reg , \reg , #PSR_T_BIT )
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bne 1f
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orr \reg, \reg, #PSR_A_BIT
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badr lr, 2f
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msr spsr_cxsf, \reg
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__MSR_ELR_HYP(14)
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__ERET
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1: msr cpsr_c, \reg
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2:
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#else
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/*
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* workaround for possibly broken pre-v6 hardware
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* (akita, Sharp Zaurus C-1000, PXA270-based)
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*/
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setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, \reg
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#endif
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.endm
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/*
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* STRT/LDRT access macros with ARM and Thumb-2 variants
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*/
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#ifdef CONFIG_THUMB2_KERNEL
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.macro usraccoff, instr, reg, ptr, inc, off, cond, abort, t=TUSER()
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9999:
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.if \inc == 1
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\instr\()b\t\cond\().w \reg, [\ptr, #\off]
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.elseif \inc == 4
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\instr\t\cond\().w \reg, [\ptr, #\off]
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.else
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.error "Unsupported inc macro argument"
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.endif
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.pushsection __ex_table,"a"
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.align 3
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.long 9999b, \abort
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.popsection
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro usracc, instr, reg, ptr, inc, cond, rept, abort
|
||
|
|
@ explicit IT instruction needed because of the label
|
||
|
|
@ introduced by the USER macro
|
||
|
|
.ifnc \cond,al
|
||
|
|
.if \rept == 1
|
||
|
|
itt \cond
|
||
|
|
.elseif \rept == 2
|
||
|
|
ittt \cond
|
||
|
|
.else
|
||
|
|
.error "Unsupported rept macro argument"
|
||
|
|
.endif
|
||
|
|
.endif
|
||
|
|
|
||
|
|
@ Slightly optimised to avoid incrementing the pointer twice
|
||
|
|
usraccoff \instr, \reg, \ptr, \inc, 0, \cond, \abort
|
||
|
|
.if \rept == 2
|
||
|
|
usraccoff \instr, \reg, \ptr, \inc, \inc, \cond, \abort
|
||
|
|
.endif
|
||
|
|
|
||
|
|
add\cond \ptr, #\rept * \inc
|
||
|
|
.endm
|
||
|
|
|
||
|
|
#else /* !CONFIG_THUMB2_KERNEL */
|
||
|
|
|
||
|
|
.macro usracc, instr, reg, ptr, inc, cond, rept, abort, t=TUSER()
|
||
|
|
.rept \rept
|
||
|
|
9999:
|
||
|
|
.if \inc == 1
|
||
|
|
\instr\()b\t\cond \reg, [\ptr], #\inc
|
||
|
|
.elseif \inc == 4
|
||
|
|
\instr\t\cond \reg, [\ptr], #\inc
|
||
|
|
.else
|
||
|
|
.error "Unsupported inc macro argument"
|
||
|
|
.endif
|
||
|
|
|
||
|
|
.pushsection __ex_table,"a"
|
||
|
|
.align 3
|
||
|
|
.long 9999b, \abort
|
||
|
|
.popsection
|
||
|
|
.endr
|
||
|
|
.endm
|
||
|
|
|
||
|
|
#endif /* CONFIG_THUMB2_KERNEL */
|
||
|
|
|
||
|
|
.macro strusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
|
||
|
|
usracc str, \reg, \ptr, \inc, \cond, \rept, \abort
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro ldrusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
|
||
|
|
usracc ldr, \reg, \ptr, \inc, \cond, \rept, \abort
|
||
|
|
.endm
|
||
|
|
|
||
|
|
/* Utility macro for declaring string literals */
|
||
|
|
.macro string name:req, string
|
||
|
|
.type \name , #object
|
||
|
|
\name:
|
||
|
|
.asciz "\string"
|
||
|
|
.size \name , . - \name
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro csdb
|
||
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
||
|
|
.inst.w 0xf3af8014
|
||
|
|
#else
|
||
|
|
.inst 0xe320f014
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
|
||
|
|
#ifndef CONFIG_CPU_USE_DOMAINS
|
||
|
|
adds \tmp, \addr, #\size - 1
|
||
|
|
sbcscc \tmp, \tmp, \limit
|
||
|
|
bcs \bad
|
||
|
|
#ifdef CONFIG_CPU_SPECTRE
|
||
|
|
movcs \addr, #0
|
||
|
|
csdb
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
|
||
|
|
#ifdef CONFIG_CPU_SPECTRE
|
||
|
|
sub \tmp, \limit, #1
|
||
|
|
subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
|
||
|
|
addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
|
||
|
|
subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
|
||
|
|
movlo \addr, #0 @ if (tmp < 0) addr = NULL
|
||
|
|
csdb
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro uaccess_disable, tmp, isb=1
|
||
|
|
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||
|
|
/*
|
||
|
|
* Whenever we re-enter userspace, the domains should always be
|
||
|
|
* set appropriately.
|
||
|
|
*/
|
||
|
|
mov \tmp, #DACR_UACCESS_DISABLE
|
||
|
|
mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
|
||
|
|
.if \isb
|
||
|
|
instr_sync
|
||
|
|
.endif
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro uaccess_enable, tmp, isb=1
|
||
|
|
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||
|
|
/*
|
||
|
|
* Whenever we re-enter userspace, the domains should always be
|
||
|
|
* set appropriately.
|
||
|
|
*/
|
||
|
|
mov \tmp, #DACR_UACCESS_ENABLE
|
||
|
|
mcr p15, 0, \tmp, c3, c0, 0
|
||
|
|
.if \isb
|
||
|
|
instr_sync
|
||
|
|
.endif
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro uaccess_save, tmp
|
||
|
|
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||
|
|
mrc p15, 0, \tmp, c3, c0, 0
|
||
|
|
str \tmp, [sp, #SVC_DACR]
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro uaccess_restore
|
||
|
|
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||
|
|
ldr r0, [sp, #SVC_DACR]
|
||
|
|
mcr p15, 0, r0, c3, c0, 0
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
|
||
|
|
.macro ret\c, reg
|
||
|
|
#if __LINUX_ARM_ARCH__ < 6
|
||
|
|
mov\c pc, \reg
|
||
|
|
#else
|
||
|
|
.ifeqs "\reg", "lr"
|
||
|
|
bx\c \reg
|
||
|
|
.else
|
||
|
|
mov\c pc, \reg
|
||
|
|
.endif
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
.endr
|
||
|
|
|
||
|
|
.macro ret.w, reg
|
||
|
|
ret \reg
|
||
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
||
|
|
nop
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro bug, msg, line
|
||
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
||
|
|
1: .inst 0xde02
|
||
|
|
#else
|
||
|
|
1: .inst 0xe7f001f2
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
||
|
|
.pushsection .rodata.str, "aMS", %progbits, 1
|
||
|
|
2: .asciz "\msg"
|
||
|
|
.popsection
|
||
|
|
.pushsection __bug_table, "aw"
|
||
|
|
.align 2
|
||
|
|
.word 1b, 2b
|
||
|
|
.hword \line
|
||
|
|
.popsection
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
#ifdef CONFIG_KPROBES
|
||
|
|
#define _ASM_NOKPROBE(entry) \
|
||
|
|
.pushsection "_kprobe_blacklist", "aw" ; \
|
||
|
|
.balign 4 ; \
|
||
|
|
.long entry; \
|
||
|
|
.popsection
|
||
|
|
#else
|
||
|
|
#define _ASM_NOKPROBE(entry)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* __ASM_ASSEMBLER_H__ */
|