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[src/trunk]: src/sys/arch/powerpc/ibm4xx copy{in,out}str: sync style with booke.
details: https://anonhg.NetBSD.org/src/rev/fd91823870d9
branches: trunk
changeset: 1007929:fd91823870d9
user: rin <rin%NetBSD.org@localhost>
date: Thu Mar 05 00:54:13 2020 +0000
description:
copy{in,out}str: sync style with booke.
- early return in case of len == 0
- *done = 0 on fault
diffstat:
sys/arch/powerpc/ibm4xx/copyinstr.c | 61 ++++++++++++++++++----------------
sys/arch/powerpc/ibm4xx/copyoutstr.c | 62 +++++++++++++++++++----------------
2 files changed, 65 insertions(+), 58 deletions(-)
diffs (191 lines):
diff -r 35ae4c70bd9a -r fd91823870d9 sys/arch/powerpc/ibm4xx/copyinstr.c
--- a/sys/arch/powerpc/ibm4xx/copyinstr.c Thu Mar 05 00:33:56 2020 +0000
+++ b/sys/arch/powerpc/ibm4xx/copyinstr.c Thu Mar 05 00:54:13 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: copyinstr.c,v 1.9 2010/03/20 23:31:29 chs Exp $ */
+/* $NetBSD: copyinstr.c,v 1.10 2020/03/05 00:54:13 rin Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
@@ -36,7 +36,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: copyinstr.c,v 1.9 2010/03/20 23:31:29 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: copyinstr.c,v 1.10 2020/03/05 00:54:13 rin Exp $");
#include <sys/param.h>
#include <uvm/uvm_extern.h>
@@ -49,11 +49,16 @@
int rv, msr, pid, tmp, ctx;
struct faultbuf env;
+ if (__predict_false(len == 0)) {
+ if (done)
+ *done = 0;
+ return 0;
+ }
+
if ((rv = setfault(&env))) {
curpcb->pcb_onfault = NULL;
- /* XXXX -- len may be lost on a fault */
if (done)
- *done = len;
+ *done = 0;
return rv;
}
@@ -63,34 +68,32 @@
ctx = pm->pm_ctx;
}
- if (len) {
- __asm volatile("mtctr %3;" /* Set up counter */
- "mfmsr %0;" /* Save MSR */
- "li %1,0x20; "
- "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
- "mfpid %1;" /* Save old PID */
- "sync; isync;"
+ __asm volatile(
+ "mtctr %3;" /* Set up counter */
+ "mfmsr %0;" /* Save MSR */
+ "li %1,0x20;"
+ "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
+ "mfpid %1;" /* Save old PID */
+ "sync; isync;"
- "li %3,0;" /* Clear len */
+ "li %3,0;" /* Clear len */
- "1: "
- "mtpid %4; sync;" /* Load user ctx */
- "lbz %2,0(%5); addi %5,%5,1;" /* Load byte */
- "sync; isync;"
- "mtpid %1;sync;"
- "stb %2,0(%6); dcbf 0,%6; addi %6,%6,1;" /* Store kernel byte */
- "sync; isync;"
- "addi %3,%3,1;" /* Inc len */
- "or. %2,%2,%2;"
- "bdnzf 2,1b;" /*
- * while(ctr-- && !zero)
- */
+ "1: "
+ "mtpid %4; sync;" /* Load user ctx */
+ "lbz %2,0(%5); addi %5,%5,1;" /* Load byte */
+ "sync; isync;"
+ "mtpid %1;sync;"
+ "stb %2,0(%6); dcbf 0,%6; addi %6,%6,1;"
+ /* Store kernel byte */
+ "sync; isync;"
+ "addi %3,%3,1;" /* Inc len */
+ "or. %2,%2,%2;"
+ "bdnzf 2,1b;" /* while(ctr-- && !zero) */
+ "mtpid %1; mtmsr %0;" /* Restore PID, MSR */
+ "sync; isync;"
+ : "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+b" (len)
+ : "r" (ctx), "b" (udaddr), "b" (kaddr));
- "mtpid %1; mtmsr %0;" /* Restore PID, MSR */
- "sync; isync;"
- : "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+b" (len)
- : "r" (ctx), "b" (udaddr), "b" (kaddr));
- }
curpcb->pcb_onfault = NULL;
if (done)
*done = len;
diff -r 35ae4c70bd9a -r fd91823870d9 sys/arch/powerpc/ibm4xx/copyoutstr.c
--- a/sys/arch/powerpc/ibm4xx/copyoutstr.c Thu Mar 05 00:33:56 2020 +0000
+++ b/sys/arch/powerpc/ibm4xx/copyoutstr.c Thu Mar 05 00:54:13 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: copyoutstr.c,v 1.9 2010/03/20 23:31:29 chs Exp $ */
+/* $NetBSD: copyoutstr.c,v 1.10 2020/03/05 00:54:13 rin Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
@@ -36,7 +36,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: copyoutstr.c,v 1.9 2010/03/20 23:31:29 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: copyoutstr.c,v 1.10 2020/03/05 00:54:13 rin Exp $");
#include <sys/param.h>
#include <uvm/uvm_extern.h>
@@ -49,11 +49,16 @@
int rv, msr, pid, tmp, ctx;
struct faultbuf env;
+ if (__predict_false(len == 0)) {
+ if (done)
+ *done = 0;
+ return 0;
+ }
+
if ((rv = setfault(&env))) {
curpcb->pcb_onfault = NULL;
- /* XXXX -- len may be lost on a fault */
if (done)
- *done = len;
+ *done = 0;
return rv;
}
@@ -63,34 +68,33 @@
ctx = pm->pm_ctx;
}
- if (len) {
- __asm volatile("mtctr %3;" /* Set up counter */
- "mfmsr %0;" /* Save MSR */
- "li %1,0x20; "
- "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
- "mfpid %1;" /* Save old PID */
- "sync; isync;"
+ __asm volatile(
+ "mtctr %3;" /* Set up counter */
+ "mfmsr %0;" /* Save MSR */
+ "li %1,0x20;"
+ "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
+ "mfpid %1;" /* Save old PID */
+ "sync; isync;"
- "li %3,0;" /* Clear len */
+ "li %3,0;" /* Clear len */
- "1:"
- "mtpid %1;sync;"
- "lbz %2,0(%6); addi %6,%6,1;" /* Store kernel byte */
- "sync; isync;"
- "mtpid %4; sync;" /* Load user ctx */
- "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Load byte */
- "sync; isync;"
- "addi %3,%3,1;" /* Inc len */
- "or. %2,%2,%2;"
- "bdnzf 2,1b;" /*
- * while(ctr-- && !zero)
- */
+ "1:"
+ "mtpid %1;sync;"
+ "lbz %2,0(%6); addi %6,%6,1;" /* Store kernel byte */
+ "sync; isync;"
+ "mtpid %4; sync;" /* Load user ctx */
+ "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;"
+ /* Load byte */
+ "sync; isync;"
+ "addi %3,%3,1;" /* Inc len */
+ "or. %2,%2,%2;"
+ "bdnzf 2,1b;" /* while(ctr-- && !zero) */
- "mtpid %1; mtmsr %0;" /* Restore PID, MSR */
- "sync; isync;"
- : "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+b" (len)
- : "r" (ctx), "b" (udaddr), "b" (kaddr));
- }
+ "mtpid %1; mtmsr %0;" /* Restore PID, MSR */
+ "sync; isync;"
+ : "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+b" (len)
+ : "r" (ctx), "b" (udaddr), "b" (kaddr));
+
curpcb->pcb_onfault = NULL;
if (done)
*done = len;
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