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Clear exclusive monitors when handling data aborts, the monitors are

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in unknown state per spec.

Reviewed by:	andrew (previous version)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D3668
This commit is contained in:
Konstantin Belousov 2015-09-18 16:52:18 +00:00
parent cf8b6f76a2
commit 6ced378970
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=287960
2 changed files with 18 additions and 0 deletions
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7
sys/arm64/arm64/trap.c
View File

@ -155,6 +155,13 @@ data_abort(struct trapframe *frame, uint64_t esr, int lower)
uint64_t far;
int error, sig, ucode;
/*
* According to the ARMv8-A rev. A.g, B2.10.5 "Load-Exclusive
* and Store-Exclusive instruction usage restrictions", state
* of the exclusive monitors after data abort exception is unknown.
*/
clrex();
#ifdef KDB
if (kdb_active) {
kdb_reenter();

11
sys/arm64/include/cpufunc.h
View File

@ -108,6 +108,17 @@ get_mpidr(void)
return (mpidr);
}
static __inline void
clrex(void)
{
/*
* Ensure compiler barrier, otherwise the monitor clear might
* occur too late for us ?
*/
__asm __volatile("clrex" : : : "memory");
}
#define cpu_nullop() arm64_nullop()
#define cpufunc_nullop() arm64_nullop()
#define cpu_setttb(a) arm64_setttb(a)