/* * Based on arch/arm/include/asm/assembler.h * * Copyright (C) 1996-2000 Russell King * Copyright (C) 2012 ARM Ltd. * * 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 program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASSEMBLY__ #error "Only include this from assembly code" #endif #include <asm/ptrace.h> #include <asm/thread_info.h> /* * Stack pushing/popping (register pairs only). Equivalent to store decrement * before, load increment after. */ .macro push, xreg1, xreg2 stp \xreg1, \xreg2, [sp, #-16]! .endm .macro pop, xreg1, xreg2 ldp \xreg1, \xreg2, [sp], #16 .endm /* * Enable and disable interrupts. */ .macro disable_irq msr daifset, #2 .endm .macro enable_irq msr daifclr, #2 .endm /* * Save/disable and restore interrupts. */ .macro save_and_disable_irqs, olddaif mrs \olddaif, daif disable_irq .endm .macro restore_irqs, olddaif msr daif, \olddaif .endm /* * Enable and disable debug exceptions. */ .macro disable_dbg msr daifset, #8 .endm .macro enable_dbg msr daifclr, #8 .endm .macro disable_step_tsk, flgs, tmp tbz \flgs, #TIF_SINGLESTEP, 9990f mrs \tmp, mdscr_el1 bic \tmp, \tmp, #1 msr mdscr_el1, \tmp isb // Synchronise with enable_dbg 9990: .endm .macro enable_step_tsk, flgs, tmp tbz \flgs, #TIF_SINGLESTEP, 9990f disable_dbg mrs \tmp, mdscr_el1 orr \tmp, \tmp, #1 msr mdscr_el1, \tmp 9990: .endm /* * Enable both debug exceptions and interrupts. This is likely to be * faster than two daifclr operations, since writes to this register * are self-synchronising. */ .macro enable_dbg_and_irq msr daifclr, #(8 | 2) .endm /* * SMP data memory barrier */ .macro smp_dmb, opt #ifdef CONFIG_SMP dmb \opt #endif .endm #define USER(l, x...) \ 9999: x; \ .section __ex_table,"a"; \ .align 3; \ .quad 9999b,l; \ .previous /* * Register aliases. */ lr .req x30 // link register /* * Vector entry */ .macro ventry label .align 7 b \label .endm /* * Select code when configured for BE. */ #ifdef CONFIG_CPU_BIG_ENDIAN #define CPU_BE(code...) code #else #define CPU_BE(code...) #endif /* * Select code when configured for LE. */ #ifdef CONFIG_CPU_BIG_ENDIAN #define CPU_LE(code...) #else #define CPU_LE(code...) code #endif /* * Define a macro that constructs a 64-bit value by concatenating two * 32-bit registers. Note that on big endian systems the order of the * registers is swapped. */ #ifndef CONFIG_CPU_BIG_ENDIAN .macro regs_to_64, rd, lbits, hbits #else .macro regs_to_64, rd, hbits, lbits #endif orr \rd, \lbits, \hbits, lsl #32 .endm