2 * arch/arm/include/asm/assembler.h
4 * Copyright (C) 1996-2000 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This file contains arm architecture specific defines
11 * for the different processors.
13 * Do not include any C declarations in this file - it is included by
16 #ifndef __ASM_ASSEMBLER_H__
17 #define __ASM_ASSEMBLER_H__
20 #error "Only include this from assembly code"
23 #include <asm/ptrace.h>
24 #include <asm/domain.h>
25 #include <asm/opcodes-virt.h>
26 #include <asm/asm-offsets.h>
28 #include <asm/thread_info.h>
33 * Endian independent macros for shifting bytes within registers.
38 #define get_byte_0 lsl #0
39 #define get_byte_1 lsr #8
40 #define get_byte_2 lsr #16
41 #define get_byte_3 lsr #24
42 #define put_byte_0 lsl #0
43 #define put_byte_1 lsl #8
44 #define put_byte_2 lsl #16
45 #define put_byte_3 lsl #24
49 #define get_byte_0 lsr #24
50 #define get_byte_1 lsr #16
51 #define get_byte_2 lsr #8
52 #define get_byte_3 lsl #0
53 #define put_byte_0 lsl #24
54 #define put_byte_1 lsl #16
55 #define put_byte_2 lsl #8
56 #define put_byte_3 lsl #0
59 /* Select code for any configuration running in BE8 mode */
60 #ifdef CONFIG_CPU_ENDIAN_BE8
61 #define ARM_BE8(code...) code
63 #define ARM_BE8(code...)
67 * Data preload for architectures that support it
69 #if __LINUX_ARM_ARCH__ >= 5
70 #define PLD(code...) code
76 * This can be used to enable code to cacheline align the destination
77 * pointer when bulk writing to memory. Experiments on StrongARM and
78 * XScale didn't show this a worthwhile thing to do when the cache is not
79 * set to write-allocate (this would need further testing on XScale when WA
82 * On Feroceon there is much to gain however, regardless of cache mode.
84 #ifdef CONFIG_CPU_FEROCEON
85 #define CALGN(code...) code
87 #define CALGN(code...)
91 * Enable and disable interrupts
93 #if __LINUX_ARM_ARCH__ >= 6
94 .macro disable_irq_notrace
98 .macro enable_irq_notrace
102 .macro disable_irq_notrace
103 msr cpsr_c, #PSR_I_BIT | SVC_MODE
106 .macro enable_irq_notrace
107 msr cpsr_c, #SVC_MODE
111 .macro asm_trace_hardirqs_off, save=1
112 #if defined(CONFIG_TRACE_IRQFLAGS)
114 stmdb sp!, {r0-r3, ip, lr}
116 bl trace_hardirqs_off
118 ldmia sp!, {r0-r3, ip, lr}
123 .macro asm_trace_hardirqs_on, cond=al, save=1
124 #if defined(CONFIG_TRACE_IRQFLAGS)
126 * actually the registers should be pushed and pop'd conditionally, but
127 * after bl the flags are certainly clobbered
130 stmdb sp!, {r0-r3, ip, lr}
132 bl\cond trace_hardirqs_on
134 ldmia sp!, {r0-r3, ip, lr}
139 .macro disable_irq, save=1
141 asm_trace_hardirqs_off \save
145 asm_trace_hardirqs_on
149 * Save the current IRQ state and disable IRQs. Note that this macro
150 * assumes FIQs are enabled, and that the processor is in SVC mode.
152 .macro save_and_disable_irqs, oldcpsr
153 #ifdef CONFIG_CPU_V7M
154 mrs \oldcpsr, primask
161 .macro save_and_disable_irqs_notrace, oldcpsr
162 #ifdef CONFIG_CPU_V7M
163 mrs \oldcpsr, primask
171 * Restore interrupt state previously stored in a register. We don't
172 * guarantee that this will preserve the flags.
174 .macro restore_irqs_notrace, oldcpsr
175 #ifdef CONFIG_CPU_V7M
176 msr primask, \oldcpsr
182 .macro restore_irqs, oldcpsr
183 tst \oldcpsr, #PSR_I_BIT
184 asm_trace_hardirqs_on cond=eq
185 restore_irqs_notrace \oldcpsr
189 * Assembly version of "adr rd, BSYM(sym)". This should only be used to
190 * reference local symbols in the same assembly file which are to be
191 * resolved by the assembler. Other usage is undefined.
193 .irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
194 .macro badr\c, rd, sym
195 #ifdef CONFIG_THUMB2_KERNEL
204 * Get current thread_info.
206 .macro get_thread_info, rd
207 ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT )
209 THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT )
210 mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT
214 * Increment/decrement the preempt count.
216 #ifdef CONFIG_PREEMPT_COUNT
217 .macro inc_preempt_count, ti, tmp
218 ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count
219 add \tmp, \tmp, #1 @ increment it
220 str \tmp, [\ti, #TI_PREEMPT]
223 .macro dec_preempt_count, ti, tmp
224 ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count
225 sub \tmp, \tmp, #1 @ decrement it
226 str \tmp, [\ti, #TI_PREEMPT]
229 .macro dec_preempt_count_ti, ti, tmp
231 dec_preempt_count \ti, \tmp
234 .macro inc_preempt_count, ti, tmp
237 .macro dec_preempt_count, ti, tmp
240 .macro dec_preempt_count_ti, ti, tmp
246 .pushsection __ex_table,"a"; \
252 #define ALT_SMP(instr...) \
255 * Note: if you get assembler errors from ALT_UP() when building with
256 * CONFIG_THUMB2_KERNEL, you almost certainly need to use
257 * ALT_SMP( W(instr) ... )
259 #define ALT_UP(instr...) \
260 .pushsection ".alt.smp.init", "a" ;\
263 .if . - 9997b == 2 ;\
266 .if . - 9997b != 4 ;\
267 .error "ALT_UP() content must assemble to exactly 4 bytes";\
270 #define ALT_UP_B(label) \
271 .equ up_b_offset, label - 9998b ;\
272 .pushsection ".alt.smp.init", "a" ;\
274 W(b) . + up_b_offset ;\
277 #define ALT_SMP(instr...)
278 #define ALT_UP(instr...) instr
279 #define ALT_UP_B(label) b label
283 * Instruction barrier
286 #if __LINUX_ARM_ARCH__ >= 7
288 #elif __LINUX_ARM_ARCH__ == 6
289 mcr p15, 0, r0, c7, c5, 4
294 * SMP data memory barrier
298 #if __LINUX_ARM_ARCH__ >= 7
304 #elif __LINUX_ARM_ARCH__ == 6
305 ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb
307 #error Incompatible SMP platform
317 #if defined(CONFIG_CPU_V7M)
319 * setmode is used to assert to be in svc mode during boot. For v7-M
320 * this is done in __v7m_setup, so setmode can be empty here.
322 .macro setmode, mode, reg
324 #elif defined(CONFIG_THUMB2_KERNEL)
325 .macro setmode, mode, reg
330 .macro setmode, mode, reg
336 * Helper macro to enter SVC mode cleanly and mask interrupts. reg is
337 * a scratch register for the macro to overwrite.
339 * This macro is intended for forcing the CPU into SVC mode at boot time.
340 * you cannot return to the original mode.
342 .macro safe_svcmode_maskall reg:req
343 #if __LINUX_ARM_ARCH__ >= 6 && !defined(CONFIG_CPU_V7M)
345 eor \reg, \reg, #HYP_MODE
347 bic \reg , \reg , #MODE_MASK
348 orr \reg , \reg , #PSR_I_BIT | PSR_F_BIT | SVC_MODE
349 THUMB( orr \reg , \reg , #PSR_T_BIT )
351 orr \reg, \reg, #PSR_A_BIT
360 * workaround for possibly broken pre-v6 hardware
361 * (akita, Sharp Zaurus C-1000, PXA270-based)
363 setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, \reg
368 * STRT/LDRT access macros with ARM and Thumb-2 variants
370 #ifdef CONFIG_THUMB2_KERNEL
372 .macro usraccoff, instr, reg, ptr, inc, off, cond, abort, t=TUSER()
375 \instr\cond\()b\()\t\().w \reg, [\ptr, #\off]
377 \instr\cond\()\t\().w \reg, [\ptr, #\off]
379 .error "Unsupported inc macro argument"
382 .pushsection __ex_table,"a"
388 .macro usracc, instr, reg, ptr, inc, cond, rept, abort
389 @ explicit IT instruction needed because of the label
390 @ introduced by the USER macro
397 .error "Unsupported rept macro argument"
401 @ Slightly optimised to avoid incrementing the pointer twice
402 usraccoff \instr, \reg, \ptr, \inc, 0, \cond, \abort
404 usraccoff \instr, \reg, \ptr, \inc, \inc, \cond, \abort
407 add\cond \ptr, #\rept * \inc
410 #else /* !CONFIG_THUMB2_KERNEL */
412 .macro usracc, instr, reg, ptr, inc, cond, rept, abort, t=TUSER()
416 \instr\cond\()b\()\t \reg, [\ptr], #\inc
418 \instr\cond\()\t \reg, [\ptr], #\inc
420 .error "Unsupported inc macro argument"
423 .pushsection __ex_table,"a"
430 #endif /* CONFIG_THUMB2_KERNEL */
432 .macro strusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
433 usracc str, \reg, \ptr, \inc, \cond, \rept, \abort
436 .macro ldrusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
437 usracc ldr, \reg, \ptr, \inc, \cond, \rept, \abort
440 /* Utility macro for declaring string literals */
441 .macro string name:req, string
442 .type \name , #object
445 .size \name , . - \name
448 .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
449 #ifndef CONFIG_CPU_USE_DOMAINS
450 adds \tmp, \addr, #\size - 1
451 sbcccs \tmp, \tmp, \limit
456 .macro uaccess_disable, tmp, isb=1
457 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
459 * Whenever we re-enter userspace, the domains should always be
462 mov \tmp, #DACR_UACCESS_DISABLE
463 mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
470 .macro uaccess_enable, tmp, isb=1
471 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
473 * Whenever we re-enter userspace, the domains should always be
476 mov \tmp, #DACR_UACCESS_ENABLE
477 mcr p15, 0, \tmp, c3, c0, 0
484 .macro uaccess_save, tmp
485 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
486 mrc p15, 0, \tmp, c3, c0, 0
487 str \tmp, [sp, #SVC_DACR]
491 .macro uaccess_restore
492 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
493 ldr r0, [sp, #SVC_DACR]
494 mcr p15, 0, r0, c3, c0, 0
498 .irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
500 #if __LINUX_ARM_ARCH__ < 6
514 #ifdef CONFIG_THUMB2_KERNEL
519 #endif /* __ASM_ASSEMBLER_H__ */