253 строки
5.3 KiB
C
253 строки
5.3 KiB
C
/*
|
|
* arch/arm/include/asm/assembler.h
|
|
*
|
|
* Copyright (C) 1996-2000 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This file contains arm architecture specific defines
|
|
* for the different processors.
|
|
*
|
|
* Do not include any C declarations in this file - it is included by
|
|
* assembler source.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#error "Only include this from assembly code"
|
|
#endif
|
|
|
|
#include <asm/ptrace.h>
|
|
|
|
/*
|
|
* Endian independent macros for shifting bytes within registers.
|
|
*/
|
|
#ifndef __ARMEB__
|
|
#define pull lsr
|
|
#define push lsl
|
|
#define get_byte_0 lsl #0
|
|
#define get_byte_1 lsr #8
|
|
#define get_byte_2 lsr #16
|
|
#define get_byte_3 lsr #24
|
|
#define put_byte_0 lsl #0
|
|
#define put_byte_1 lsl #8
|
|
#define put_byte_2 lsl #16
|
|
#define put_byte_3 lsl #24
|
|
#else
|
|
#define pull lsl
|
|
#define push lsr
|
|
#define get_byte_0 lsr #24
|
|
#define get_byte_1 lsr #16
|
|
#define get_byte_2 lsr #8
|
|
#define get_byte_3 lsl #0
|
|
#define put_byte_0 lsl #24
|
|
#define put_byte_1 lsl #16
|
|
#define put_byte_2 lsl #8
|
|
#define put_byte_3 lsl #0
|
|
#endif
|
|
|
|
/*
|
|
* Data preload for architectures that support it
|
|
*/
|
|
#if __LINUX_ARM_ARCH__ >= 5
|
|
#define PLD(code...) code
|
|
#else
|
|
#define PLD(code...)
|
|
#endif
|
|
|
|
/*
|
|
* This can be used to enable code to cacheline align the destination
|
|
* pointer when bulk writing to memory. Experiments on StrongARM and
|
|
* XScale didn't show this a worthwhile thing to do when the cache is not
|
|
* set to write-allocate (this would need further testing on XScale when WA
|
|
* is used).
|
|
*
|
|
* On Feroceon there is much to gain however, regardless of cache mode.
|
|
*/
|
|
#ifdef CONFIG_CPU_FEROCEON
|
|
#define CALGN(code...) code
|
|
#else
|
|
#define CALGN(code...)
|
|
#endif
|
|
|
|
/*
|
|
* Enable and disable interrupts
|
|
*/
|
|
#if __LINUX_ARM_ARCH__ >= 6
|
|
.macro disable_irq_notrace
|
|
cpsid i
|
|
.endm
|
|
|
|
.macro enable_irq_notrace
|
|
cpsie i
|
|
.endm
|
|
#else
|
|
.macro disable_irq_notrace
|
|
msr cpsr_c, #PSR_I_BIT | SVC_MODE
|
|
.endm
|
|
|
|
.macro enable_irq_notrace
|
|
msr cpsr_c, #SVC_MODE
|
|
.endm
|
|
#endif
|
|
|
|
.macro asm_trace_hardirqs_off
|
|
#if defined(CONFIG_TRACE_IRQFLAGS)
|
|
stmdb sp!, {r0-r3, ip, lr}
|
|
bl trace_hardirqs_off
|
|
ldmia sp!, {r0-r3, ip, lr}
|
|
#endif
|
|
.endm
|
|
|
|
.macro asm_trace_hardirqs_on_cond, cond
|
|
#if defined(CONFIG_TRACE_IRQFLAGS)
|
|
/*
|
|
* actually the registers should be pushed and pop'd conditionally, but
|
|
* after bl the flags are certainly clobbered
|
|
*/
|
|
stmdb sp!, {r0-r3, ip, lr}
|
|
bl\cond trace_hardirqs_on
|
|
ldmia sp!, {r0-r3, ip, lr}
|
|
#endif
|
|
.endm
|
|
|
|
.macro asm_trace_hardirqs_on
|
|
asm_trace_hardirqs_on_cond al
|
|
.endm
|
|
|
|
.macro disable_irq
|
|
disable_irq_notrace
|
|
asm_trace_hardirqs_off
|
|
.endm
|
|
|
|
.macro enable_irq
|
|
asm_trace_hardirqs_on
|
|
enable_irq_notrace
|
|
.endm
|
|
/*
|
|
* Save the current IRQ state and disable IRQs. Note that this macro
|
|
* assumes FIQs are enabled, and that the processor is in SVC mode.
|
|
*/
|
|
.macro save_and_disable_irqs, oldcpsr
|
|
mrs \oldcpsr, cpsr
|
|
disable_irq
|
|
.endm
|
|
|
|
/*
|
|
* Restore interrupt state previously stored in a register. We don't
|
|
* guarantee that this will preserve the flags.
|
|
*/
|
|
.macro restore_irqs_notrace, oldcpsr
|
|
msr cpsr_c, \oldcpsr
|
|
.endm
|
|
|
|
.macro restore_irqs, oldcpsr
|
|
tst \oldcpsr, #PSR_I_BIT
|
|
asm_trace_hardirqs_on_cond eq
|
|
restore_irqs_notrace \oldcpsr
|
|
.endm
|
|
|
|
#define USER(x...) \
|
|
9999: x; \
|
|
.section __ex_table,"a"; \
|
|
.align 3; \
|
|
.long 9999b,9001f; \
|
|
.previous
|
|
|
|
/*
|
|
* SMP data memory barrier
|
|
*/
|
|
.macro smp_dmb
|
|
#ifdef CONFIG_SMP
|
|
#if __LINUX_ARM_ARCH__ >= 7
|
|
dmb
|
|
#elif __LINUX_ARM_ARCH__ == 6
|
|
mcr p15, 0, r0, c7, c10, 5 @ dmb
|
|
#endif
|
|
#endif
|
|
.endm
|
|
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
|
.macro setmode, mode, reg
|
|
mov \reg, #\mode
|
|
msr cpsr_c, \reg
|
|
.endm
|
|
#else
|
|
.macro setmode, mode, reg
|
|
msr cpsr_c, #\mode
|
|
.endm
|
|
#endif
|
|
|
|
/*
|
|
* STRT/LDRT access macros with ARM and Thumb-2 variants
|
|
*/
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
|
|
|
.macro usraccoff, instr, reg, ptr, inc, off, cond, abort
|
|
9999:
|
|
.if \inc == 1
|
|
\instr\cond\()bt \reg, [\ptr, #\off]
|
|
.elseif \inc == 4
|
|
\instr\cond\()t \reg, [\ptr, #\off]
|
|
.else
|
|
.error "Unsupported inc macro argument"
|
|
.endif
|
|
|
|
.section __ex_table,"a"
|
|
.align 3
|
|
.long 9999b, \abort
|
|
.previous
|
|
.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, 4, \cond, \abort
|
|
.endif
|
|
|
|
add\cond \ptr, #\rept * \inc
|
|
.endm
|
|
|
|
#else /* !CONFIG_THUMB2_KERNEL */
|
|
|
|
.macro usracc, instr, reg, ptr, inc, cond, rept, abort
|
|
.rept \rept
|
|
9999:
|
|
.if \inc == 1
|
|
\instr\cond\()bt \reg, [\ptr], #\inc
|
|
.elseif \inc == 4
|
|
\instr\cond\()t \reg, [\ptr], #\inc
|
|
.else
|
|
.error "Unsupported inc macro argument"
|
|
.endif
|
|
|
|
.section __ex_table,"a"
|
|
.align 3
|
|
.long 9999b, \abort
|
|
.previous
|
|
.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
|