Commit 587064b6 authored by Punit Agrawal's avatar Punit Agrawal Committed by Will Deacon

arm64: Add framework for legacy instruction emulation

Typically, providing support for legacy instructions requires
emulating the behaviour of instructions whose encodings have become
undefined. If the instructions haven't been removed from the
architecture, there maybe an option in the implementation to turn
on/off the support for these instructions.

Create common infrastructure to support legacy instruction
emulation. In addition to emulation, also provide an option to support
hardware execution when supported. The default execution mode (one of
undef, emulate, hw exeuction) is dependent on the state of the
instruction (deprecated or obsolete) in the architecture and
can specified at the time of registering the instruction handlers. The
runtime state of the emulation can be controlled by writing to
individual nodes in sysctl. The expected default behaviour is
documented as part of this patch.
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarPunit Agrawal <punit.agrawal@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 0be0e44c
The arm64 port of the Linux kernel provides infrastructure to support
emulation of instructions which have been deprecated, or obsoleted in
the architecture. The infrastructure code uses undefined instruction
hooks to support emulation. Where available it also allows turning on
the instruction execution in hardware.
The emulation mode can be controlled by writing to sysctl nodes
(/proc/sys/abi). The following explains the different execution
behaviours and the corresponding values of the sysctl nodes -
* Undef
Value: 0
Generates undefined instruction abort. Default for instructions that
have been obsoleted in the architecture, e.g., SWP
* Emulate
Value: 1
Uses software emulation. To aid migration of software, in this mode
usage of emulated instruction is traced as well as rate limited
warnings are issued. This is the default for deprecated
instructions, .e.g., CP15 barriers
* Hardware Execution
Value: 2
Although marked as deprecated, some implementations may support the
enabling/disabling of hardware support for the execution of these
instructions. Using hardware execution generally provides better
performance, but at the loss of ability to gather runtime statistics
about the use of the deprecated instructions.
The default mode depends on the status of the instruction in the
architecture. Deprecated instructions should default to emulation
while obsolete instructions must be undefined by default.
......@@ -164,6 +164,24 @@ config ARCH_XGENE
help
This enables support for AppliedMicro X-Gene SOC Family
comment "Processor Features"
menuconfig ARMV8_DEPRECATED
bool "Emulate deprecated/obsolete ARMv8 instructions"
depends on COMPAT
help
Legacy software support may require certain instructions
that have been deprecated or obsoleted in the architecture.
Enable this config to enable selective emulation of these
features.
If unsure, say Y
if ARMV8_DEPRECATED
endif
endmenu
menu "Bus support"
......
......@@ -32,6 +32,7 @@ arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
arm64-obj-$(CONFIG_PCI) += pci.o
arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
......
/*
* Copyright (C) 2014 ARM Limited
*
* 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.
*/
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <asm/traps.h>
/*
* The runtime support for deprecated instruction support can be in one of
* following three states -
*
* 0 = undef
* 1 = emulate (software emulation)
* 2 = hw (supported in hardware)
*/
enum insn_emulation_mode {
INSN_UNDEF,
INSN_EMULATE,
INSN_HW,
};
enum legacy_insn_status {
INSN_DEPRECATED,
INSN_OBSOLETE,
};
struct insn_emulation_ops {
const char *name;
enum legacy_insn_status status;
struct undef_hook *hooks;
int (*set_hw_mode)(bool enable);
};
struct insn_emulation {
struct list_head node;
struct insn_emulation_ops *ops;
int current_mode;
int min;
int max;
};
static LIST_HEAD(insn_emulation);
static int nr_insn_emulated;
static DEFINE_RAW_SPINLOCK(insn_emulation_lock);
static void register_emulation_hooks(struct insn_emulation_ops *ops)
{
struct undef_hook *hook;
BUG_ON(!ops->hooks);
for (hook = ops->hooks; hook->instr_mask; hook++)
register_undef_hook(hook);
pr_notice("Registered %s emulation handler\n", ops->name);
}
static void remove_emulation_hooks(struct insn_emulation_ops *ops)
{
struct undef_hook *hook;
BUG_ON(!ops->hooks);
for (hook = ops->hooks; hook->instr_mask; hook++)
unregister_undef_hook(hook);
pr_notice("Removed %s emulation handler\n", ops->name);
}
static int update_insn_emulation_mode(struct insn_emulation *insn,
enum insn_emulation_mode prev)
{
int ret = 0;
switch (prev) {
case INSN_UNDEF: /* Nothing to be done */
break;
case INSN_EMULATE:
remove_emulation_hooks(insn->ops);
break;
case INSN_HW:
if (insn->ops->set_hw_mode) {
insn->ops->set_hw_mode(false);
pr_notice("Disabled %s support\n", insn->ops->name);
}
break;
}
switch (insn->current_mode) {
case INSN_UNDEF:
break;
case INSN_EMULATE:
register_emulation_hooks(insn->ops);
break;
case INSN_HW:
if (insn->ops->set_hw_mode && insn->ops->set_hw_mode(true))
pr_notice("Enabled %s support\n", insn->ops->name);
else
ret = -EINVAL;
break;
}
return ret;
}
static void register_insn_emulation(struct insn_emulation_ops *ops)
{
unsigned long flags;
struct insn_emulation *insn;
insn = kzalloc(sizeof(*insn), GFP_KERNEL);
insn->ops = ops;
insn->min = INSN_UNDEF;
switch (ops->status) {
case INSN_DEPRECATED:
insn->current_mode = INSN_EMULATE;
insn->max = INSN_HW;
break;
case INSN_OBSOLETE:
insn->current_mode = INSN_UNDEF;
insn->max = INSN_EMULATE;
break;
}
raw_spin_lock_irqsave(&insn_emulation_lock, flags);
list_add(&insn->node, &insn_emulation);
nr_insn_emulated++;
raw_spin_unlock_irqrestore(&insn_emulation_lock, flags);
/* Register any handlers if required */
update_insn_emulation_mode(insn, INSN_UNDEF);
}
static int emulation_proc_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
int ret = 0;
struct insn_emulation *insn = (struct insn_emulation *) table->data;
enum insn_emulation_mode prev_mode = insn->current_mode;
table->data = &insn->current_mode;
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (ret || !write || prev_mode == insn->current_mode)
goto ret;
ret = update_insn_emulation_mode(insn, prev_mode);
if (!ret) {
/* Mode change failed, revert to previous mode. */
insn->current_mode = prev_mode;
update_insn_emulation_mode(insn, INSN_UNDEF);
}
ret:
table->data = insn;
return ret;
}
static struct ctl_table ctl_abi[] = {
{
.procname = "abi",
.mode = 0555,
},
{ }
};
static void register_insn_emulation_sysctl(struct ctl_table *table)
{
unsigned long flags;
int i = 0;
struct insn_emulation *insn;
struct ctl_table *insns_sysctl, *sysctl;
insns_sysctl = kzalloc(sizeof(*sysctl) * (nr_insn_emulated + 1),
GFP_KERNEL);
raw_spin_lock_irqsave(&insn_emulation_lock, flags);
list_for_each_entry(insn, &insn_emulation, node) {
sysctl = &insns_sysctl[i];
sysctl->mode = 0644;
sysctl->maxlen = sizeof(int);
sysctl->procname = insn->ops->name;
sysctl->data = insn;
sysctl->extra1 = &insn->min;
sysctl->extra2 = &insn->max;
sysctl->proc_handler = emulation_proc_handler;
i++;
}
raw_spin_unlock_irqrestore(&insn_emulation_lock, flags);
table->child = insns_sysctl;
register_sysctl_table(table);
}
/*
* Invoked as late_initcall, since not needed before init spawned.
*/
static int __init armv8_deprecated_init(void)
{
register_insn_emulation_sysctl(ctl_abi);
return 0;
}
late_initcall(armv8_deprecated_init);
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