powerpc: Fix system calls on Cell entered with XER.SO=1

Submitted by Paul Mackerras on Nov. 26, 2008, 12:59 a.m.

Details

Message ID 18732.40814.991329.362635@cargo.ozlabs.ibm.com
State Superseded, archived
Headers show

Commit Message

Paul Mackerras Nov. 26, 2008, 12:59 a.m.
It turns out that on Cell, on a kernel with CONFIG_VIRT_CPU_ACCOUNTING
= y, if a program sets the SO (summary overflow) bit in the XER and
then does a system call, the SO bit in CR0 will be set on return
regardless of whether the system call detected an error.  Since CR0.SO
is used as the error indication from the system call, this means that
all system calls appear to fail.

The reason is that the workaround for the timebase bug on Cell uses a
compare instruction.  With CONFIG_VIRT_CPU_ACCOUNTING = y, the
ACCOUNT_CPU_USER_ENTRY macro reads the timebase, so we end up doing a
compare instruction, which copies XER.SO to CR0.SO.  Since we were
doing this in the system call entry patch after clearing CR0.SO but
before saving the CR, this meant that the saved CR image had CR0.SO
set if XER.SO was set on entry.

This fixes it by moving the clearing of CR0.SO to after the
ACCOUNT_CPU_USER_ENTRY call in the system call entry path.

Signed-off-by: Paul Mackerras <paulus@samba.org>
---

Comments

Arnd Bergmann Nov. 26, 2008, 10:52 a.m.
On Wednesday 26 November 2008, Paul Mackerras wrote:
> This fixes it by moving the clearing of CR0.SO to after the
> ACCOUNT_CPU_USER_ENTRY call in the system call entry path.

Thanks for taking care of this!

> Signed-off-by: Paul Mackerras <paulus@samba.org>

Acked-by: Arnd Bergmann <arnd@arndb.de>

Patch hide | download patch | download mbox

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index e6d5284..9d80f55 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -57,12 +57,12 @@  system_call_common:
 	beq-	1f
 	ld	r1,PACAKSAVE(r13)
 1:	std	r10,0(r1)
-	crclr	so
 	std	r11,_NIP(r1)
 	std	r12,_MSR(r1)
 	std	r0,GPR0(r1)
 	std	r10,GPR1(r1)
 	ACCOUNT_CPU_USER_ENTRY(r10, r11)
+	crclr	so
 	std	r2,GPR2(r1)
 	std	r3,GPR3(r1)
 	std	r4,GPR4(r1)