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/*
* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __ASM_MACROS_S__
#define __ASM_MACROS_S__
#include <arch.h>
#include <asm_macros_common.S>
#include <spinlock.h>
.macro func_prologue
stp x29, x30, [sp, #-0x10]!
mov x29,sp
.endm
.macro func_epilogue
ldp x29, x30, [sp], #0x10
.endm
.macro dcache_line_size reg, tmp
mrs \tmp, ctr_el0
ubfx \tmp, \tmp, #16, #4
mov \reg, #4
lsl \reg, \reg, \tmp
.endm
.macro icache_line_size reg, tmp
mrs \tmp, ctr_el0
and \tmp, \tmp, #0xf
mov \reg, #4
lsl \reg, \reg, \tmp
.endm
.macro smc_check label
mrs x0, esr_el3
ubfx x0, x0, #ESR_EC_SHIFT, #ESR_EC_LENGTH
cmp x0, #EC_AARCH64_SMC
b.ne $label
.endm
/*
* Declare the exception vector table, enforcing it is aligned on a
* 2KB boundary, as required by the ARMv8 architecture.
* Use zero bytes as the fill value to be stored in the padding bytes
* so that it inserts illegal AArch64 instructions. This increases
* security, robustness and potentially facilitates debugging.
*/
.macro vector_base label
.section .vectors, "ax"
.align 11, 0
\label:
.endm
/*
* Create an entry in the exception vector table, enforcing it is
* aligned on a 128-byte boundary, as required by the ARMv8 architecture.
* Use zero bytes as the fill value to be stored in the padding bytes
* so that it inserts illegal AArch64 instructions. This increases
* security, robustness and potentially facilitates debugging.
*/
.macro vector_entry label
.cfi_sections .debug_frame
.section .vectors, "ax"
.align 7, 0
.type \label, %function
.func \label
.cfi_startproc
\label:
.endm
/*
* This macro verifies that the given vector doesn't exceed the
* architectural limit of 32 instructions. This is meant to be placed
* immediately after the last instruction in the vector. It takes the
* vector entry as the parameter
*/
.macro check_vector_size since
.endfunc
.cfi_endproc
.if (. - \since) > (32 * 4)
.error "Vector exceeds 32 instructions"
.endif
.endm
#if ENABLE_PLAT_COMPAT
/*
* This macro calculates the base address of an MP stack using the
* platform_get_core_pos() index, the name of the stack storage and
* the size of each stack
* In: X0 = MPIDR of CPU whose stack is wanted
* Out: X0 = physical address of stack base
* Clobber: X30, X1, X2
*/
.macro get_mp_stack _name, _size
bl platform_get_core_pos
ldr x2, =(\_name + \_size)
mov x1, #\_size
madd x0, x0, x1, x2
.endm
#endif
/*
* This macro calculates the base address of the current CPU's MP stack
* using the plat_my_core_pos() index, the name of the stack storage
* and the size of each stack
* Out: X0 = physical address of stack base
* Clobber: X30, X1, X2
*/
.macro get_my_mp_stack _name, _size
bl plat_my_core_pos
ldr x2, =(\_name + \_size)
mov x1, #\_size
madd x0, x0, x1, x2
.endm
/*
* This macro calculates the base address of a UP stack using the
* name of the stack storage and the size of the stack
* Out: X0 = physical address of stack base
*/
.macro get_up_stack _name, _size
ldr x0, =(\_name + \_size)
.endm
/*
* Helper macro to generate the best mov/movk combinations according
* the value to be moved. The 16 bits from '_shift' are tested and
* if not zero, they are moved into '_reg' without affecting
* other bits.
*/
.macro _mov_imm16 _reg, _val, _shift
.if (\_val >> \_shift) & 0xffff
.if (\_val & (1 << \_shift - 1))
movk \_reg, (\_val >> \_shift) & 0xffff, LSL \_shift
.else
mov \_reg, \_val & (0xffff << \_shift)
.endif
.endif
.endm
/*
* Helper macro to load arbitrary values into 32 or 64-bit registers
* which generates the best mov/movk combinations. Many base addresses
* are 64KB aligned the macro will eliminate updating bits 15:0 in
* that case
*/
.macro mov_imm _reg, _val
.if (\_val) == 0
mov \_reg, #0
.else
_mov_imm16 \_reg, (\_val), 0
_mov_imm16 \_reg, (\_val), 16
_mov_imm16 \_reg, (\_val), 32
_mov_imm16 \_reg, (\_val), 48
.endif
.endm
/*
* Macro to mark instances where we're jumping to a function and don't
* expect a return. To provide the function being jumped to with
* additional information, we use 'bl' instruction to jump rather than
* 'b'.
*
* Debuggers infer the location of a call from where LR points to, which
* is usually the instruction after 'bl'. If this macro expansion
* happens to be the last location in a function, that'll cause the LR
* to point a location beyond the function, thereby misleading debugger
* back trace. We therefore insert a 'nop' after the function call for
* debug builds, unless 'skip_nop' parameter is non-zero.
*/
.macro no_ret _func:req, skip_nop=0
bl \_func
#if DEBUG
.ifeq \skip_nop
nop
.endif
#endif
.endm
/*
* Reserve space for a spin lock in assembly file.
*/
.macro define_asm_spinlock _name:req
.align SPINLOCK_ASM_ALIGN
\_name:
.space SPINLOCK_ASM_SIZE
.endm
#endif /* __ASM_MACROS_S__ */