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slightly optimized loop for trap_doast() calls

This commit is contained in:
ryo 2020-10-15 08:37:20 +00:00
parent f5010e6cd4
commit 6d558a35c5
1 changed files with 11 additions and 11 deletions
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22
sys/arch/aarch64/aarch64/vectors.S
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@ -1,4 +1,4 @@
/* $NetBSD: vectors.S,v 1.20 2020/10/06 06:26:46 skrll Exp $ */
/* $NetBSD: vectors.S,v 1.21 2020/10/15 08:37:20 ryo Exp $ */
#include <aarch64/asm.h>
#include <aarch64/locore.h>
@ -10,7 +10,7 @@
#include "opt_ddb.h"
#include "opt_dtrace.h"
RCSID("$NetBSD: vectors.S,v 1.20 2020/10/06 06:26:46 skrll Exp $")
RCSID("$NetBSD: vectors.S,v 1.21 2020/10/15 08:37:20 ryo Exp $")
ARMV8_DEFINE_OPTIONS
@ -255,26 +255,26 @@ ENTRY_NP(el0_trap)
nop /* dummy for DDB backtrace (for lr-4) */
#endif
ENTRY_NP(el0_trap_exit)
DISABLE_INTERRUPT /* make sure I|F marked */
adr lr, 1f /* return address from trap_doast */
1:
/* while (curlwp->l_md.md_astpending != 0) { */
mrs x8, tpidr_el1
ldr w9, [x8, #L_MD_ASTPENDING]
cbz w9, 9f
DISABLE_INTERRUPT /* make sure I|F marked */
mrs x9, tpidr_el1
ldr w8, [x9, #L_MD_ASTPENDING]
cbz w8, 9f
/* curlwp->l_md.md_astpending = 0; */
str xzr, [x8, #L_MD_ASTPENDING]
str xzr, [x9, #L_MD_ASTPENDING]
/* trap_doast(tf); */
ENABLE_INTERRUPT
mov x0, sp
bl _C_LABEL(trap_doast)
DISABLE_INTERRUPT
b 1b
b _C_LABEL(trap_doast) /* tail call (return to 1b) */
/* } */
9:
mrs x9, tpidr_el1
/* x9 is tpidr_el1 */
ldr x23, [x9, #L_MD_CPACR]
msr cpacr_el1, x23 /* FP unit EL0 handover */
isb /* necessary? */