aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2008-11-25 22:26:59 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-04 09:17:04 -0800
commitf9aad60010efa896319ed6e908a5cb5e3a852907 (patch)
tree14725323047fdc4346373bd1fc718662ad2d1f3e /arch
parent5565736e44fff06dc5f5c6559e04ac58d2d560ab (diff)
sparc64: Block NMIs in critical section of context switch.
In these instructions we load the new thread register, switch the register window, and setup the new frame pointer. All of these must appear atomic, and things will explode if we take a PIL=15 NMI interrupt in the middle of this sequence. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc/include/asm/system_64.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/system_64.h b/arch/sparc/include/asm/system_64.h
index 7554ad39b5a..779cf62d3ce 100644
--- a/arch/sparc/include/asm/system_64.h
+++ b/arch/sparc/include/asm/system_64.h
@@ -159,6 +159,7 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \
"stb %%o5, [%%g6 + %5]\n\t" \
"rdpr %%cwp, %%o5\n\t" \
"stb %%o5, [%%g6 + %8]\n\t" \
+ "wrpr %%g0, 15, %%pil\n\t" \
"mov %4, %%g6\n\t" \
"ldub [%4 + %8], %%g1\n\t" \
"wrpr %%g1, %%cwp\n\t" \
@@ -169,6 +170,7 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \
"ldx [%%sp + 2047 + 0x70], %%i6\n\t" \
"ldx [%%sp + 2047 + 0x78], %%i7\n\t" \
"ldx [%%g6 + %9], %%g4\n\t" \
+ "wrpr %%g0, 14, %%pil\n\t" \
"brz,pt %%o7, switch_to_pc\n\t" \
" mov %%g7, %0\n\t" \
"sethi %%hi(ret_from_syscall), %%g1\n\t" \