/* * 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 __ASM_ASSEMBLER_H__ #define __ASM_ASSEMBLER_H__ #ifndef __ASSEMBLY__ #error "Only include this from assembly code" #endif #include #include #define IOMEM(x) (x) /* * 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 .macro save_and_disable_irqs_notrace, oldcpsr mrs \oldcpsr, cpsr disable_irq_notrace .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; \ .pushsection __ex_table,"a"; \ .align 3; \ .long 9999b,9001f; \ .popsection #ifdef CONFIG_SMP #define ALT_SMP(instr...) \ 9998: instr /* * Note: if you get assembler errors from ALT_UP() when building with * CONFIG_THUMB2_KERNEL, you almost certainly need to use * ALT_SMP( W(instr) ... ) */ #define ALT_UP(instr...) \ .pushsection ".alt.smp.init", "a" ;\ .long 9998b ;\ 9997: instr ;\ .if . - 9997b != 4 ;\ .error "ALT_UP() content must assemble to exactly 4 bytes";\ .endif ;\ .popsection #define ALT_UP_B(label) \ .equ up_b_offset, label - 9998b ;\ .pushsection ".alt.smp.init", "a" ;\ .long 9998b ;\ W(b) . + up_b_offset ;\ .popsection #else #define ALT_SMP(instr...) #define ALT_UP(instr...) instr #define ALT_UP_B(label) b label #endif /* * Instruction barrier */ .macro instr_sync #if __LINUX_ARM_ARCH__ >= 7 isb #elif __LINUX_ARM_ARCH__ == 6 mcr p15, 0, r0, c7, c5, 4 #endif .endm /* * SMP data memory barrier */ .macro smp_dmb mode #ifdef CONFIG_SMP #if __LINUX_ARM_ARCH__ >= 7 .ifeqs "\mode","arm" ALT_SMP(dmb) .else ALT_SMP(W(dmb)) .endif #elif __LINUX_ARM_ARCH__ == 6 ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb #else #error Incompatible SMP platform #endif .ifeqs "\mode","arm" ALT_UP(nop) .else ALT_UP(W(nop)) .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, t=TUSER() 9999: .if \inc == 1 \instr\cond\()b\()\t\().w \reg, [\ptr, #\off] .elseif \inc == 4 \instr\cond\()\t\().w \reg, [\ptr, #\off] .else .error "Unsupported inc macro argument" .endif .pushsection __ex_table,"a" .align 3 .long 9999b, \abort .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\cond\()b\()\t \reg, [\ptr], #\inc .elseif \inc == 4 \instr\cond\()\t \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 check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req #ifndef CONFIG_CPU_USE_DOMAINS adds \tmp, \addr, #\size - 1 sbcccs \tmp, \tmp, \limit bcs \bad #endif .endm #endif /* __ASM_ASSEMBLER_H__ */