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add support userspace tagged address for aarch64 (experimental)

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'sysctl machdep.tagged_address' to set/clear TCR_EL1.TBI0 to enable/disable address tagging.
with 'machdep.tagged_address=1', some syscalls may cause problems?
This commit is contained in:
ryo 2020-02-29 21:36:03 +00:00
parent 3d8f5129e4
commit 616852b11f
1 changed files with 63 additions and 2 deletions
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65
sys/arch/aarch64/aarch64/aarch64_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: aarch64_machdep.c,v 1.39 2020/02/29 21:09:11 ryo Exp $ */
/* $NetBSD: aarch64_machdep.c,v 1.40 2020/02/29 21:36:03 ryo Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(1, "$NetBSD: aarch64_machdep.c,v 1.39 2020/02/29 21:09:11 ryo Exp $");
__KERNEL_RCSID(1, "$NetBSD: aarch64_machdep.c,v 1.40 2020/02/29 21:36:03 ryo Exp $");
#include "opt_arm_debug.h"
#include "opt_ddb.h"
@ -50,6 +50,7 @@ __KERNEL_RCSID(1, "$NetBSD: aarch64_machdep.c,v 1.39 2020/02/29 21:09:11 ryo Exp
#include <sys/msgbuf.h>
#include <sys/reboot.h>
#include <sys/sysctl.h>
#include <sys/xcall.h>
#include <dev/mm.h>
@ -397,6 +398,66 @@ initarm_common(vaddr_t kvm_base, vsize_t kvm_size,
return (vaddr_t)tf;
}
/*
* machine dependent system variables.
*/
static xcfunc_t
set_user_tagged_address(void *arg1, void *arg2)
{
uint64_t enable = PTRTOUINT64(arg1);
uint64_t tcr = reg_tcr_el1_read();
if (enable)
tcr |= TCR_TBI0;
else
tcr &= ~TCR_TBI0;
reg_tcr_el1_write(tcr);
return 0;
}
static int
sysctl_machdep_tagged_address(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int error, cur, val;
uint64_t tcr;
tcr = reg_tcr_el1_read();
cur = val = (tcr & TCR_TBI0) ? 1 : 0;
node = *rnode;
node.sysctl_data = &val;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (val < 0 || val > 1)
return EINVAL;
if (cur != val) {
uint64_t where = xc_broadcast(0,
(xcfunc_t)set_user_tagged_address, UINT64TOPTR(val), NULL);
xc_wait(where);
}
return 0;
}
SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "machdep", NULL,
NULL, 0, NULL, 0,
CTL_MACHDEP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "tagged_address",
SYSCTL_DESCR("top byte ignored in the address calculation"),
sysctl_machdep_tagged_address, 0, NULL, 0,
CTL_MACHDEP, CTL_CREATE, CTL_EOL);
}
void
parse_mi_bootargs(char *args)
{