diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-04-30 12:39:03 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 01:20:27 +1000 |
| commit | 1a4b739bbb4f8857d1b4feb46d6b3ec72269c111 (patch) | |
| tree | 1e2212d55c675e3fefcfd9e5049695a5bcbdfd2e /arch/powerpc/kernel/entry_32.S | |
| parent | b86fb88855ea7881314b935df1df6b1ef1bd0c32 (diff) | |
powerpc/32: implement fast entry for syscalls on BOOKE
This patch implements a fast entry for syscalls.
Syscalls don't have to preserve non volatile registers except LR.
This patch then implement a fast entry for syscalls, where
volatile registers get clobbered.
As this entry is dedicated to syscall it always sets MSR_EE
and warns in case MSR_EE was previously off
It also assumes that the call is always from user, system calls are
unexpected from kernel.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 184cc1de2f37..dc58fec51ed6 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -342,7 +342,6 @@ stack_ovf: SYNC RFI -#ifndef CONFIG_BOOKE /* to be removed once BOOKE uses fast syscall entry */ #ifdef CONFIG_TRACE_IRQFLAGS trace_syscall_entry_irq_off: /* @@ -369,7 +368,6 @@ transfer_to_syscall: andi. r12,r9,MSR_EE beq- trace_syscall_entry_irq_off #endif /* CONFIG_TRACE_IRQFLAGS */ -#endif /* !CONFIG_BOOKE */ /* * Handle a system call. @@ -382,11 +380,6 @@ _GLOBAL(DoSyscall) stw r3,ORIG_GPR3(r1) li r12,0 stw r12,RESULT(r1) -#ifdef CONFIG_BOOKE /* to be removed once BOOKE uses fast syscall entry */ - lwz r11,_CCR(r1) /* Clear SO bit in CR */ - rlwinm r11,r11,0,4,2 - stw r11,_CCR(r1) -#endif #ifdef CONFIG_TRACE_IRQFLAGS /* Make sure interrupts are enabled */ mfmsr r11 |