MINI Sh3ll
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
*
* Copyright (C) 1996-2000 Russell King
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASSEMBLY__
#error "Only include this from assembly code"
#endif
#ifndef __ASM_ASSEMBLER_H
#define __ASM_ASSEMBLER_H
#include <asm-generic/export.h>
#include <asm/asm-offsets.h>
#include <asm/alternative.h>
#include <asm/asm-bug.h>
#include <asm/cpufeature.h>
#include <asm/cputype.h>
#include <asm/debug-monitors.h>
#include <asm/page.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
/*
* Provide a wxN alias for each wN register so what we can paste a xN
* reference after a 'w' to obtain the 32-bit version.
*/
.irp n,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
wx\n .req w\n
.endr
.macro save_and_disable_daif, flags
mrs \flags, daif
msr daifset, #0xf
.endm
.macro disable_daif
msr daifset, #0xf
.endm
.macro enable_daif
msr daifclr, #0xf
.endm
.macro restore_daif, flags:req
msr daif, \flags
.endm
/* IRQ/FIQ are the lowest priority flags, unconditionally unmask the rest. */
.macro enable_da
msr daifclr, #(8 | 4)
.endm
/*
* Save/restore interrupts.
*/
.macro save_and_disable_irq, flags
mrs \flags, daif
msr daifset, #3
.endm
.macro restore_irq, flags
msr daif, \flags
.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, #DBG_MDSCR_SS
msr mdscr_el1, \tmp
isb // Synchronise with enable_dbg
9990:
.endm
/* call with daif masked */
.macro enable_step_tsk, flgs, tmp
tbz \flgs, #TIF_SINGLESTEP, 9990f
mrs \tmp, mdscr_el1
orr \tmp, \tmp, #DBG_MDSCR_SS
msr mdscr_el1, \tmp
9990:
.endm
/*
* RAS Error Synchronization barrier
*/
.macro esb
#ifdef CONFIG_ARM64_RAS_EXTN
hint #16
#else
nop
#endif
.endm
/*
* Value prediction barrier
*/
.macro csdb
hint #20
.endm
/*
* Clear Branch History instruction
*/
.macro clearbhb
hint #22
.endm
/*
* Speculation barrier
*/
.macro sb
alternative_if_not ARM64_HAS_SB
dsb nsh
isb
alternative_else
SB_BARRIER_INSN
nop
alternative_endif
.endm
/*
* NOP sequence
*/
.macro nops, num
.rept \num
nop
.endr
.endm
/*
* Create an exception table entry for `insn`, which will branch to `fixup`
* when an unhandled fault is taken.
*/
.macro _asm_extable, insn, fixup
.pushsection __ex_table, "a"
.align 3
.long (\insn - .), (\fixup - .)
.popsection
.endm
/*
* Create an exception table entry for `insn` if `fixup` is provided. Otherwise
* do nothing.
*/
.macro _cond_extable, insn, fixup
.ifnc \fixup,
_asm_extable \insn, \fixup
.endif
.endm
#define USER(l, x...) \
9999: x; \
_asm_extable 9999b, l
/*
* 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
/*
* Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
* <symbol> is within the range +/- 4 GB of the PC.
*/
/*
* @dst: destination register (64 bit wide)
* @sym: name of the symbol
*/
.macro adr_l, dst, sym
adrp \dst, \sym
add \dst, \dst, :lo12:\sym
.endm
/*
* @dst: destination register (32 or 64 bit wide)
* @sym: name of the symbol
* @tmp: optional 64-bit scratch register to be used if <dst> is a
* 32-bit wide register, in which case it cannot be used to hold
* the address
*/
.macro ldr_l, dst, sym, tmp=
.ifb \tmp
adrp \dst, \sym
ldr \dst, [\dst, :lo12:\sym]
.else
adrp \tmp, \sym
ldr \dst, [\tmp, :lo12:\sym]
.endif
.endm
/*
* @src: source register (32 or 64 bit wide)
* @sym: name of the symbol
* @tmp: mandatory 64-bit scratch register to calculate the address
* while <src> needs to be preserved.
*/
.macro str_l, src, sym, tmp
adrp \tmp, \sym
str \src, [\tmp, :lo12:\sym]
.endm
/*
* @dst: destination register
*/
#if defined(__KVM_NVHE_HYPERVISOR__) || defined(__KVM_VHE_HYPERVISOR__)
.macro get_this_cpu_offset, dst
mrs \dst, tpidr_el2
.endm
#else
.macro get_this_cpu_offset, dst
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
mrs \dst, tpidr_el1
alternative_else
mrs \dst, tpidr_el2
alternative_endif
.endm
.macro set_this_cpu_offset, src
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
msr tpidr_el1, \src
alternative_else
msr tpidr_el2, \src
alternative_endif
.endm
#endif
/*
* @dst: Result of per_cpu(sym, smp_processor_id()) (can be SP)
* @sym: The name of the per-cpu variable
* @tmp: scratch register
*/
.macro adr_this_cpu, dst, sym, tmp
adrp \tmp, \sym
add \dst, \tmp, #:lo12:\sym
get_this_cpu_offset \tmp
add \dst, \dst, \tmp
.endm
/*
* @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
* @sym: The name of the per-cpu variable
* @tmp: scratch register
*/
.macro ldr_this_cpu dst, sym, tmp
adr_l \dst, \sym
get_this_cpu_offset \tmp
ldr \dst, [\dst, \tmp]
.endm
/*
* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
*/
.macro vma_vm_mm, rd, rn
ldr \rd, [\rn, #VMA_VM_MM]
.endm
/*
* read_ctr - read CTR_EL0. If the system has mismatched register fields,
* provide the system wide safe value from arm64_ftr_reg_ctrel0.sys_val
*/
.macro read_ctr, reg
#ifndef __KVM_NVHE_HYPERVISOR__
alternative_if_not ARM64_MISMATCHED_CACHE_TYPE
mrs \reg, ctr_el0 // read CTR
nop
alternative_else
ldr_l \reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
alternative_endif
#else
alternative_if_not ARM64_KVM_PROTECTED_MODE
ASM_BUG()
alternative_else_nop_endif
alternative_cb kvm_compute_final_ctr_el0
movz \reg, #0
movk \reg, #0, lsl #16
movk \reg, #0, lsl #32
movk \reg, #0, lsl #48
alternative_cb_end
#endif
.endm
/*
* raw_dcache_line_size - get the minimum D-cache line size on this CPU
* from the CTR register.
*/
.macro raw_dcache_line_size, reg, tmp
mrs \tmp, ctr_el0 // read CTR
ubfm \tmp, \tmp, #16, #19 // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
/*
* dcache_line_size - get the safe D-cache line size across all CPUs
*/
.macro dcache_line_size, reg, tmp
read_ctr \tmp
ubfm \tmp, \tmp, #16, #19 // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
/*
* raw_icache_line_size - get the minimum I-cache line size on this CPU
* from the CTR register.
*/
.macro raw_icache_line_size, reg, tmp
mrs \tmp, ctr_el0 // read CTR
and \tmp, \tmp, #0xf // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
/*
* icache_line_size - get the safe I-cache line size across all CPUs
*/
.macro icache_line_size, reg, tmp
read_ctr \tmp
and \tmp, \tmp, #0xf // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
/*
* tcr_set_t0sz - update TCR.T0SZ so that we can load the ID map
*/
.macro tcr_set_t0sz, valreg, t0sz
bfi \valreg, \t0sz, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
.endm
/*
* tcr_set_t1sz - update TCR.T1SZ
*/
.macro tcr_set_t1sz, valreg, t1sz
bfi \valreg, \t1sz, #TCR_T1SZ_OFFSET, #TCR_TxSZ_WIDTH
.endm
/*
* tcr_compute_pa_size - set TCR.(I)PS to the highest supported
* ID_AA64MMFR0_EL1.PARange value
*
* tcr: register with the TCR_ELx value to be updated
* pos: IPS or PS bitfield position
* tmp{0,1}: temporary registers
*/
.macro tcr_compute_pa_size, tcr, pos, tmp0, tmp1
mrs \tmp0, ID_AA64MMFR0_EL1
// Narrow PARange to fit the PS field in TCR_ELx
ubfx \tmp0, \tmp0, #ID_AA64MMFR0_PARANGE_SHIFT, #3
mov \tmp1, #ID_AA64MMFR0_PARANGE_MAX
cmp \tmp0, \tmp1
csel \tmp0, \tmp1, \tmp0, hi
bfi \tcr, \tmp0, \pos, #3
.endm
.macro __dcache_op_workaround_clean_cache, op, addr
alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
dc \op, \addr
alternative_else
dc civac, \addr
alternative_endif
.endm
/*
* Macro to perform a data cache maintenance for the interval
* [start, end)
*
* op: operation passed to dc instruction
* domain: domain used in dsb instruciton
* start: starting virtual address of the region
* end: end virtual address of the region
* fixup: optional label to branch to on user fault
* Corrupts: start, end, tmp1, tmp2
*/
.macro dcache_by_line_op op, domain, start, end, tmp1, tmp2, fixup
dcache_line_size \tmp1, \tmp2
sub \tmp2, \tmp1, #1
bic \start, \start, \tmp2
.Ldcache_op\@:
.ifc \op, cvau
__dcache_op_workaround_clean_cache \op, \start
.else
.ifc \op, cvac
__dcache_op_workaround_clean_cache \op, \start
.else
.ifc \op, cvap
sys 3, c7, c12, 1, \start // dc cvap
.else
.ifc \op, cvadp
sys 3, c7, c13, 1, \start // dc cvadp
.else
dc \op, \start
.endif
.endif
.endif
.endif
add \start, \start, \tmp1
cmp \start, \end
b.lo .Ldcache_op\@
dsb \domain
_cond_extable .Ldcache_op\@, \fixup
.endm
/*
* Macro to perform an instruction cache maintenance for the interval
* [start, end)
*
* start, end: virtual addresses describing the region
* fixup: optional label to branch to on user fault
* Corrupts: tmp1, tmp2
*/
.macro invalidate_icache_by_line start, end, tmp1, tmp2, fixup
icache_line_size \tmp1, \tmp2
sub \tmp2, \tmp1, #1
bic \tmp2, \start, \tmp2
.Licache_op\@:
ic ivau, \tmp2 // invalidate I line PoU
add \tmp2, \tmp2, \tmp1
cmp \tmp2, \end
b.lo .Licache_op\@
dsb ish
isb
_cond_extable .Licache_op\@, \fixup
.endm
/*
* reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
*/
.macro reset_pmuserenr_el0, tmpreg
mrs \tmpreg, id_aa64dfr0_el1
sbfx \tmpreg, \tmpreg, #ID_AA64DFR0_PMUVER_SHIFT, #4
cmp \tmpreg, #1 // Skip if no PMU present
b.lt 9000f
msr pmuserenr_el0, xzr // Disable PMU access from EL0
9000:
.endm
/*
* reset_amuserenr_el0 - reset AMUSERENR_EL0 if AMUv1 present
*/
.macro reset_amuserenr_el0, tmpreg
mrs \tmpreg, id_aa64pfr0_el1 // Check ID_AA64PFR0_EL1
ubfx \tmpreg, \tmpreg, #ID_AA64PFR0_AMU_SHIFT, #4
cbz \tmpreg, .Lskip_\@ // Skip if no AMU present
msr_s SYS_AMUSERENR_EL0, xzr // Disable AMU access from EL0
.Lskip_\@:
.endm
/*
* copy_page - copy src to dest using temp registers t1-t8
*/
.macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req
9998: ldp \t1, \t2, [\src]
ldp \t3, \t4, [\src, #16]
ldp \t5, \t6, [\src, #32]
ldp \t7, \t8, [\src, #48]
add \src, \src, #64
stnp \t1, \t2, [\dest]
stnp \t3, \t4, [\dest, #16]
stnp \t5, \t6, [\dest, #32]
stnp \t7, \t8, [\dest, #48]
add \dest, \dest, #64
tst \src, #(PAGE_SIZE - 1)
b.ne 9998b
.endm
/*
* Annotate a function as being unsuitable for kprobes.
*/
#ifdef CONFIG_KPROBES
#define NOKPROBE(x) \
.pushsection "_kprobe_blacklist", "aw"; \
.quad x; \
.popsection;
#else
#define NOKPROBE(x)
#endif
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#define EXPORT_SYMBOL_NOKASAN(name)
#else
#define EXPORT_SYMBOL_NOKASAN(name) EXPORT_SYMBOL(name)
#endif
#ifdef CONFIG_KASAN_HW_TAGS
#define EXPORT_SYMBOL_NOHWKASAN(name)
#else
#define EXPORT_SYMBOL_NOHWKASAN(name) EXPORT_SYMBOL_NOKASAN(name)
#endif
/*
* Emit a 64-bit absolute little endian symbol reference in a way that
* ensures that it will be resolved at build time, even when building a
* PIE binary. This requires cooperation from the linker script, which
* must emit the lo32/hi32 halves individually.
*/
.macro le64sym, sym
.long \sym\()_lo32
.long \sym\()_hi32
.endm
/*
* mov_q - move an immediate constant into a 64-bit register using
* between 2 and 4 movz/movk instructions (depending on the
* magnitude and sign of the operand)
*/
.macro mov_q, reg, val
.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
movz \reg, :abs_g1_s:\val
.else
.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
movz \reg, :abs_g2_s:\val
.else
movz \reg, :abs_g3:\val
movk \reg, :abs_g2_nc:\val
.endif
movk \reg, :abs_g1_nc:\val
.endif
movk \reg, :abs_g0_nc:\val
.endm
/*
* Return the current task_struct.
*/
.macro get_current_task, rd
mrs \rd, sp_el0
.endm
/*
* Offset ttbr1 to allow for 48-bit kernel VAs set with 52-bit PTRS_PER_PGD.
* orr is used as it can cover the immediate value (and is idempotent).
* In future this may be nop'ed out when dealing with 52-bit kernel VAs.
* ttbr: Value of ttbr to set, modified.
*/
.macro offset_ttbr1, ttbr, tmp
#ifdef CONFIG_ARM64_VA_BITS_52
mrs_s \tmp, SYS_ID_AA64MMFR2_EL1
and \tmp, \tmp, #(0xf << ID_AA64MMFR2_LVA_SHIFT)
cbnz \tmp, .Lskipoffs_\@
orr \ttbr, \ttbr, #TTBR1_BADDR_4852_OFFSET
.Lskipoffs_\@ :
#endif
.endm
/*
* Perform the reverse of offset_ttbr1.
* bic is used as it can cover the immediate value and, in future, won't need
* to be nop'ed out when dealing with 52-bit kernel VAs.
*/
.macro restore_ttbr1, ttbr
#ifdef CONFIG_ARM64_VA_BITS_52
bic \ttbr, \ttbr, #TTBR1_BADDR_4852_OFFSET
#endif
.endm
/*
* Arrange a physical address in a TTBR register, taking care of 52-bit
* addresses.
*
* phys: physical address, preserved
* ttbr: returns the TTBR value
*/
.macro phys_to_ttbr, ttbr, phys
#ifdef CONFIG_ARM64_PA_BITS_52
orr \ttbr, \phys, \phys, lsr #46
and \ttbr, \ttbr, #TTBR_BADDR_MASK_52
#else
mov \ttbr, \phys
#endif
.endm
.macro phys_to_pte, pte, phys
#ifdef CONFIG_ARM64_PA_BITS_52
/*
* We assume \phys is 64K aligned and this is guaranteed by only
* supporting this configuration with 64K pages.
*/
orr \pte, \phys, \phys, lsr #36
and \pte, \pte, #PTE_ADDR_MASK
#else
mov \pte, \phys
#endif
.endm
.macro pte_to_phys, phys, pte
#ifdef CONFIG_ARM64_PA_BITS_52
ubfiz \phys, \pte, #(48 - 16 - 12), #16
bfxil \phys, \pte, #16, #32
lsl \phys, \phys, #16
#else
and \phys, \pte, #PTE_ADDR_MASK
#endif
.endm
/*
* tcr_clear_errata_bits - Clear TCR bits that trigger an errata on this CPU.
*/
.macro tcr_clear_errata_bits, tcr, tmp1, tmp2
#ifdef CONFIG_FUJITSU_ERRATUM_010001
mrs \tmp1, midr_el1
mov_q \tmp2, MIDR_FUJITSU_ERRATUM_010001_MASK
and \tmp1, \tmp1, \tmp2
mov_q \tmp2, MIDR_FUJITSU_ERRATUM_010001
cmp \tmp1, \tmp2
b.ne 10f
mov_q \tmp2, TCR_CLEAR_FUJITSU_ERRATUM_010001
bic \tcr, \tcr, \tmp2
10:
#endif /* CONFIG_FUJITSU_ERRATUM_010001 */
.endm
/**
* Errata workaround prior to disable MMU. Insert an ISB immediately prior
* to executing the MSR that will change SCTLR_ELn[M] from a value of 1 to 0.
*/
.macro pre_disable_mmu_workaround
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_E1041
isb
#endif
.endm
/*
* frame_push - Push @regcount callee saved registers to the stack,
* starting at x19, as well as x29/x30, and set x29 to
* the new value of sp. Add @extra bytes of stack space
* for locals.
*/
.macro frame_push, regcount:req, extra
__frame st, \regcount, \extra
.endm
/*
* frame_pop - Pop the callee saved registers from the stack that were
* pushed in the most recent call to frame_push, as well
* as x29/x30 and any extra stack space that may have been
* allocated.
*/
.macro frame_pop
__frame ld
.endm
.macro __frame_regs, reg1, reg2, op, num
.if .Lframe_regcount == \num
\op\()r \reg1, [sp, #(\num + 1) * 8]
.elseif .Lframe_regcount > \num
\op\()p \reg1, \reg2, [sp, #(\num + 1) * 8]
.endif
.endm
.macro __frame, op, regcount, extra=0
.ifc \op, st
.if (\regcount) < 0 || (\regcount) > 10
.error "regcount should be in the range [0 ... 10]"
.endif
.if ((\extra) % 16) != 0
.error "extra should be a multiple of 16 bytes"
.endif
.ifdef .Lframe_regcount
.if .Lframe_regcount != -1
.error "frame_push/frame_pop may not be nested"
.endif
.endif
.set .Lframe_regcount, \regcount
.set .Lframe_extra, \extra
.set .Lframe_local_offset, ((\regcount + 3) / 2) * 16
stp x29, x30, [sp, #-.Lframe_local_offset - .Lframe_extra]!
mov x29, sp
.endif
__frame_regs x19, x20, \op, 1
__frame_regs x21, x22, \op, 3
__frame_regs x23, x24, \op, 5
__frame_regs x25, x26, \op, 7
__frame_regs x27, x28, \op, 9
.ifc \op, ld
.if .Lframe_regcount == -1
.error "frame_push/frame_pop may not be nested"
.endif
ldp x29, x30, [sp], #.Lframe_local_offset + .Lframe_extra
.set .Lframe_regcount, -1
.endif
.endm
/*
* Set SCTLR_ELx to the @reg value, and invalidate the local icache
* in the process. This is called when setting the MMU on.
*/
.macro set_sctlr, sreg, reg
msr \sreg, \reg
isb
/*
* Invalidate the local I-cache so that any instructions fetched
* speculatively from the PoC are discarded, since they may have
* been dynamically patched at the PoU.
*/
ic iallu
dsb nsh
isb
.endm
.macro set_sctlr_el1, reg
set_sctlr sctlr_el1, \reg
.endm
.macro set_sctlr_el2, reg
set_sctlr sctlr_el2, \reg
.endm
/*
* Check whether preempt/bh-disabled asm code should yield as soon as
* it is able. This is the case if we are currently running in task
* context, and either a softirq is pending, or the TIF_NEED_RESCHED
* flag is set and re-enabling preemption a single time would result in
* a preempt count of zero. (Note that the TIF_NEED_RESCHED flag is
* stored negated in the top word of the thread_info::preempt_count
* field)
*/
.macro cond_yield, lbl:req, tmp:req, tmp2:req
get_current_task \tmp
ldr \tmp, [\tmp, #TSK_TI_PREEMPT]
/*
* If we are serving a softirq, there is no point in yielding: the
* softirq will not be preempted no matter what we do, so we should
* run to completion as quickly as we can.
*/
tbnz \tmp, #SOFTIRQ_SHIFT, .Lnoyield_\@
#ifdef CONFIG_PREEMPTION
sub \tmp, \tmp, #PREEMPT_DISABLE_OFFSET
cbz \tmp, \lbl
#endif
adr_l \tmp, irq_stat + IRQ_CPUSTAT_SOFTIRQ_PENDING
get_this_cpu_offset \tmp2
ldr w\tmp, [\tmp, \tmp2]
cbnz w\tmp, \lbl // yield on pending softirq in task context
.Lnoyield_\@:
.endm
/*
* This macro emits a program property note section identifying
* architecture features which require special handling, mainly for
* use in assembly files included in the VDSO.
*/
#define NT_GNU_PROPERTY_TYPE_0 5
#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0)
#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC (1U << 1)
#ifdef CONFIG_ARM64_BTI_KERNEL
#define GNU_PROPERTY_AARCH64_FEATURE_1_DEFAULT \
((GNU_PROPERTY_AARCH64_FEATURE_1_BTI | \
GNU_PROPERTY_AARCH64_FEATURE_1_PAC))
#endif
#ifdef GNU_PROPERTY_AARCH64_FEATURE_1_DEFAULT
.macro emit_aarch64_feature_1_and, feat=GNU_PROPERTY_AARCH64_FEATURE_1_DEFAULT
.pushsection .note.gnu.property, "a"
.align 3
.long 2f - 1f
.long 6f - 3f
.long NT_GNU_PROPERTY_TYPE_0
1: .string "GNU"
2:
.align 3
3: .long GNU_PROPERTY_AARCH64_FEATURE_1_AND
.long 5f - 4f
4:
/*
* This is described with an array of char in the Linux API
* spec but the text and all other usage (including binutils,
* clang and GCC) treat this as a 32 bit value so no swizzling
* is required for big endian.
*/
.long \feat
5:
.align 3
6:
.popsection
.endm
#else
.macro emit_aarch64_feature_1_and, feat=0
.endm
#endif /* GNU_PROPERTY_AARCH64_FEATURE_1_DEFAULT */
.macro __mitigate_spectre_bhb_loop tmp
#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
alternative_cb spectre_bhb_patch_loop_iter
mov \tmp, #32 // Patched to correct the immediate
alternative_cb_end
.Lspectre_bhb_loop\@:
b . + 4
subs \tmp, \tmp, #1
b.ne .Lspectre_bhb_loop\@
sb
#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
.endm
.macro mitigate_spectre_bhb_loop tmp
#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
alternative_cb spectre_bhb_patch_loop_mitigation_enable
b .L_spectre_bhb_loop_done\@ // Patched to NOP
alternative_cb_end
__mitigate_spectre_bhb_loop \tmp
.L_spectre_bhb_loop_done\@:
#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
.endm
/* Save/restores x0-x3 to the stack */
.macro __mitigate_spectre_bhb_fw
#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
stp x0, x1, [sp, #-16]!
stp x2, x3, [sp, #-16]!
mov w0, #ARM_SMCCC_ARCH_WORKAROUND_3
alternative_cb smccc_patch_fw_mitigation_conduit
nop // Patched to SMC/HVC #0
alternative_cb_end
ldp x2, x3, [sp], #16
ldp x0, x1, [sp], #16
#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
.endm
.macro mitigate_spectre_bhb_clear_insn
#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
alternative_cb spectre_bhb_patch_clearbhb
/* Patched to NOP when not supported */
clearbhb
isb
alternative_cb_end
#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
.endm
#endif /* __ASM_ASSEMBLER_H */
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