Author: jhibbits
Date: Sun Jan 13 04:51:24 2019
New Revision: 342988
URL: https://svnweb.freebsd.org/changeset/base/342988
Log:
powerpcspe: Correct SPE high-component loading
Don't clobber the low part of the register restoring the high component of.
This could lead to very bad behavior if it's an ABI-affected register.
While here, also mark the asm volatile in the SPE high save case, to match
the load case.
Reported by: Branden Bergren (git_bdragon.rtk0.net)
MFC after: 1 week
Modified:
head/sys/powerpc/booke/spe.c
Modified: head/sys/powerpc/booke/spe.c
==============================================================================
--- head/sys/powerpc/booke/spe.c Sun Jan 13 02:38:14 2019
(r342987)
+++ head/sys/powerpc/booke/spe.c Sun Jan 13 04:51:24 2019
(r342988)
@@ -425,7 +425,7 @@ static uint32_t
spe_save_reg_high(int reg)
{
uint32_t vec[2];
-#define EVSTDW(n) case n: __asm ("evstdw %1,0(%0)" \
+#define EVSTDW(n) case n: __asm __volatile ("evstdw %1,0(%0)" \
:: "b"(vec), "n"(n)); break;
switch (reg) {
EVSTDW(0); EVSTDW(1); EVSTDW(2); EVSTDW(3);
@@ -448,7 +448,7 @@ spe_save_reg_high(int reg)
static void
spe_load_reg_high(int reg, uint32_t val)
{
-#define EVLDW(n) case n: __asm __volatile("evmergelo "#n",%0,0," \
+#define EVLDW(n) case n: __asm __volatile("evmergelo "#n",%0,"#n \
:: "r"(val)); break;
switch (reg) {
EVLDW(1); EVLDW(2); EVLDW(3); EVLDW(4);
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