1 /* 2 * arch/arm/include/asm/assembler.h 3 * 4 * Copyright (C) 1996-2000 Russell King 5 * 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. 9 * 10 * This file contains arm architecture specific defines 11 * for the different processors. 12 * 13 * Do not include any C declarations in this file - it is included by 14 * assembler source. 15 */ 16 #ifndef __ASM_ASSEMBLER_H__ 17 #define __ASM_ASSEMBLER_H__ 18 19 #ifndef __ASSEMBLY__ 20 #error "Only include this from assembly code" 21 #endif 22 23 #include <asm/ptrace.h> 24 #include <asm/domain.h> 25 26 /* 27 * Endian independent macros for shifting bytes within registers. 28 */ 29 #ifndef __ARMEB__ 30 #define pull lsr 31 #define push lsl 32 #define get_byte_0 lsl #0 33 #define get_byte_1 lsr #8 34 #define get_byte_2 lsr #16 35 #define get_byte_3 lsr #24 36 #define put_byte_0 lsl #0 37 #define put_byte_1 lsl #8 38 #define put_byte_2 lsl #16 39 #define put_byte_3 lsl #24 40 #else 41 #define pull lsl 42 #define push lsr 43 #define get_byte_0 lsr #24 44 #define get_byte_1 lsr #16 45 #define get_byte_2 lsr #8 46 #define get_byte_3 lsl #0 47 #define put_byte_0 lsl #24 48 #define put_byte_1 lsl #16 49 #define put_byte_2 lsl #8 50 #define put_byte_3 lsl #0 51 #endif 52 53 /* 54 * Data preload for architectures that support it 55 */ 56 #if __LINUX_ARM_ARCH__ >= 5 57 #define PLD(code...) code 58 #else 59 #define PLD(code...) 60 #endif 61 62 /* 63 * This can be used to enable code to cacheline align the destination 64 * pointer when bulk writing to memory. Experiments on StrongARM and 65 * XScale didn't show this a worthwhile thing to do when the cache is not 66 * set to write-allocate (this would need further testing on XScale when WA 67 * is used). 68 * 69 * On Feroceon there is much to gain however, regardless of cache mode. 70 */ 71 #ifdef CONFIG_CPU_FEROCEON 72 #define CALGN(code...) code 73 #else 74 #define CALGN(code...) 75 #endif 76 77 /* 78 * Enable and disable interrupts 79 */ 80 #if __LINUX_ARM_ARCH__ >= 6 81 .macro disable_irq_notrace 82 cpsid i 83 .endm 84 85 .macro enable_irq_notrace 86 cpsie i 87 .endm 88 #else 89 .macro disable_irq_notrace 90 msr cpsr_c, #PSR_I_BIT | SVC_MODE 91 .endm 92 93 .macro enable_irq_notrace 94 msr cpsr_c, #SVC_MODE 95 .endm 96 #endif 97 98 .macro asm_trace_hardirqs_off 99 #if defined(CONFIG_TRACE_IRQFLAGS) 100 stmdb sp!, {r0-r3, ip, lr} 101 bl trace_hardirqs_off 102 ldmia sp!, {r0-r3, ip, lr} 103 #endif 104 .endm 105 106 .macro asm_trace_hardirqs_on_cond, cond 107 #if defined(CONFIG_TRACE_IRQFLAGS) 108 /* 109 * actually the registers should be pushed and pop'd conditionally, but 110 * after bl the flags are certainly clobbered 111 */ 112 stmdb sp!, {r0-r3, ip, lr} 113 bl\cond trace_hardirqs_on 114 ldmia sp!, {r0-r3, ip, lr} 115 #endif 116 .endm 117 118 .macro asm_trace_hardirqs_on 119 asm_trace_hardirqs_on_cond al 120 .endm 121 122 .macro disable_irq 123 disable_irq_notrace 124 asm_trace_hardirqs_off 125 .endm 126 127 .macro enable_irq 128 asm_trace_hardirqs_on 129 enable_irq_notrace 130 .endm 131 /* 132 * Save the current IRQ state and disable IRQs. Note that this macro 133 * assumes FIQs are enabled, and that the processor is in SVC mode. 134 */ 135 .macro save_and_disable_irqs, oldcpsr 136 mrs \oldcpsr, cpsr 137 disable_irq 138 .endm 139 140 /* 141 * Restore interrupt state previously stored in a register. We don't 142 * guarantee that this will preserve the flags. 143 */ 144 .macro restore_irqs_notrace, oldcpsr 145 msr cpsr_c, \oldcpsr 146 .endm 147 148 .macro restore_irqs, oldcpsr 149 tst \oldcpsr, #PSR_I_BIT 150 asm_trace_hardirqs_on_cond eq 151 restore_irqs_notrace \oldcpsr 152 .endm 153 154 #define USER(x...) \ 155 9999: x; \ 156 .pushsection __ex_table,"a"; \ 157 .align 3; \ 158 .long 9999b,9001f; \ 159 .popsection 160 161 #ifdef CONFIG_SMP 162 #define ALT_SMP(instr...) \ 163 9998: instr 164 /* 165 * Note: if you get assembler errors from ALT_UP() when building with 166 * CONFIG_THUMB2_KERNEL, you almost certainly need to use 167 * ALT_SMP( W(instr) ... ) 168 */ 169 #define ALT_UP(instr...) \ 170 .pushsection ".alt.smp.init", "a" ;\ 171 .long 9998b ;\ 172 9997: instr ;\ 173 .if . - 9997b != 4 ;\ 174 .error "ALT_UP() content must assemble to exactly 4 bytes";\ 175 .endif ;\ 176 .popsection 177 #define ALT_UP_B(label) \ 178 .equ up_b_offset, label - 9998b ;\ 179 .pushsection ".alt.smp.init", "a" ;\ 180 .long 9998b ;\ 181 W(b) . + up_b_offset ;\ 182 .popsection 183 #else 184 #define ALT_SMP(instr...) 185 #define ALT_UP(instr...) instr 186 #define ALT_UP_B(label) b label 187 #endif 188 189 /* 190 * Instruction barrier 191 */ 192 .macro instr_sync 193 #if __LINUX_ARM_ARCH__ >= 7 194 isb 195 #elif __LINUX_ARM_ARCH__ == 6 196 mcr p15, 0, r0, c7, c5, 4 197 #endif 198 .endm 199 200 /* 201 * SMP data memory barrier 202 */ 203 .macro smp_dmb mode 204 #ifdef CONFIG_SMP 205 #if __LINUX_ARM_ARCH__ >= 7 206 .ifeqs "\mode","arm" 207 ALT_SMP(dmb) 208 .else 209 ALT_SMP(W(dmb)) 210 .endif 211 #elif __LINUX_ARM_ARCH__ == 6 212 ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb 213 #else 214 #error Incompatible SMP platform 215 #endif 216 .ifeqs "\mode","arm" 217 ALT_UP(nop) 218 .else 219 ALT_UP(W(nop)) 220 .endif 221 #endif 222 .endm 223 224 #ifdef CONFIG_THUMB2_KERNEL 225 .macro setmode, mode, reg 226 mov \reg, #\mode 227 msr cpsr_c, \reg 228 .endm 229 #else 230 .macro setmode, mode, reg 231 msr cpsr_c, #\mode 232 .endm 233 #endif 234 235 /* 236 * STRT/LDRT access macros with ARM and Thumb-2 variants 237 */ 238 #ifdef CONFIG_THUMB2_KERNEL 239 240 .macro usraccoff, instr, reg, ptr, inc, off, cond, abort, t=TUSER() 241 9999: 242 .if \inc == 1 243 \instr\cond\()b\()\t\().w \reg, [\ptr, #\off] 244 .elseif \inc == 4 245 \instr\cond\()\t\().w \reg, [\ptr, #\off] 246 .else 247 .error "Unsupported inc macro argument" 248 .endif 249 250 .pushsection __ex_table,"a" 251 .align 3 252 .long 9999b, \abort 253 .popsection 254 .endm 255 256 .macro usracc, instr, reg, ptr, inc, cond, rept, abort 257 @ explicit IT instruction needed because of the label 258 @ introduced by the USER macro 259 .ifnc \cond,al 260 .if \rept == 1 261 itt \cond 262 .elseif \rept == 2 263 ittt \cond 264 .else 265 .error "Unsupported rept macro argument" 266 .endif 267 .endif 268 269 @ Slightly optimised to avoid incrementing the pointer twice 270 usraccoff \instr, \reg, \ptr, \inc, 0, \cond, \abort 271 .if \rept == 2 272 usraccoff \instr, \reg, \ptr, \inc, \inc, \cond, \abort 273 .endif 274 275 add\cond \ptr, #\rept * \inc 276 .endm 277 278 #else /* !CONFIG_THUMB2_KERNEL */ 279 280 .macro usracc, instr, reg, ptr, inc, cond, rept, abort, t=TUSER() 281 .rept \rept 282 9999: 283 .if \inc == 1 284 \instr\cond\()b\()\t \reg, [\ptr], #\inc 285 .elseif \inc == 4 286 \instr\cond\()\t \reg, [\ptr], #\inc 287 .else 288 .error "Unsupported inc macro argument" 289 .endif 290 291 .pushsection __ex_table,"a" 292 .align 3 293 .long 9999b, \abort 294 .popsection 295 .endr 296 .endm 297 298 #endif /* CONFIG_THUMB2_KERNEL */ 299 300 .macro strusr, reg, ptr, inc, cond=al, rept=1, abort=9001f 301 usracc str, \reg, \ptr, \inc, \cond, \rept, \abort 302 .endm 303 304 .macro ldrusr, reg, ptr, inc, cond=al, rept=1, abort=9001f 305 usracc ldr, \reg, \ptr, \inc, \cond, \rept, \abort 306 .endm 307 308 /* Utility macro for declaring string literals */ 309 .macro string name:req, string 310 .type \name , #object 311 \name: 312 .asciz "\string" 313 .size \name , . - \name 314 .endm 315 316 #endif /* __ASM_ASSEMBLER_H__ */ 317