Author: cognet
Date: Mon Feb 24 16:25:11 2020
New Revision: 358290
URL: https://svnweb.freebsd.org/changeset/base/358290
Log:
debug_monitor: Avoid setting the PSR_D flag for 32bits binaries.
In dbg_monitor_exit(), avoid setting the PSR_D bit if the process is
a 32bits binary. PSR_D is an aarch64-only flags, and for aarch32 processes,
it means "run in big endian".
This should make COMPAT_FREEBSD32 run much better on arm64.
Modified:
head/sys/arm64/arm64/debug_monitor.c
Modified: head/sys/arm64/arm64/debug_monitor.c
==============================================================================
--- head/sys/arm64/arm64/debug_monitor.c Mon Feb 24 15:35:31 2020
(r358289)
+++ head/sys/arm64/arm64/debug_monitor.c Mon Feb 24 16:25:11 2020
(r358290)
@@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/systm.h>
+#include <sys/sysent.h>
#include <machine/armreg.h>
#include <machine/cpu.h>
@@ -534,7 +535,13 @@ dbg_monitor_exit(struct thread *thread, struct trapfra
{
int i;
- frame->tf_spsr |= PSR_D;
+ /*
+ * PSR_D is an aarch64-only flag. On aarch32, it switches
+ * the processor to big-endian, so avoid setting it for
+ * 32bits binaries.
+ */
+ if (!(SV_PROC_FLAG(thread->td_proc, SV_ILP32)))
+ frame->tf_spsr |= PSR_D;
if ((thread->td_pcb->pcb_dbg_regs.dbg_flags & DBGMON_ENABLED) != 0) {
/* Install the kernel version of the registers */
dbg_register_sync(&thread->td_pcb->pcb_dbg_regs);
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