arch/arm/include/asm/assembler.h - third_party/linux - Git at Google

 /*
  *  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 <asm/ptrace.h>
 #include <asm/domain.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

 	.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

 /*
  * 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=T()
 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=T()
 	.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__ */
	/*
	* 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 <asm/ptrace.h>
	#include <asm/domain.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

	.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

	/*
	* 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=T()
	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=T()
	.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__ */