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| author | David Howells <dhowells@redhat.com> | 2012-05-01 21:31:42 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-06-01 12:59:38 -0400 |
| commit | a2eddc7c491c916ff9ba39b3563cd779e7b58320 (patch) | |
| tree | 773f6313bcbe9682a70c28c943d0a5b417f687b1 /arch/frv/kernel | |
| parent | 1e5ef91556d0985e765252754ca90595deafb793 (diff) | |
| download | op-kernel-dev-a2eddc7c491c916ff9ba39b3563cd779e7b58320.zip op-kernel-dev-a2eddc7c491c916ff9ba39b3563cd779e7b58320.tar.gz | |
FRV: Optimise the system call exit path in entry.S [ver #2]
Optimise the system call exit path in entry.S by packing some instructions.
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/frv/kernel')
| -rw-r--r-- | arch/frv/kernel/entry.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S index 03da263..7d5e000 100644 --- a/arch/frv/kernel/entry.S +++ b/arch/frv/kernel/entry.S @@ -905,18 +905,19 @@ __syscall_call: __syscall_exit: LEDS 0x6300 - sti gr8,@(gr28,#REG_GR(8)) ; save return value + # keep current PSR in GR23 + movsg psr,gr23 - # rebuild saved psr - execve will change it for init/main.c ldi @(gr28,#REG_PSR),gr22 + + sti.p gr8,@(gr28,#REG_GR(8)) ; save return value + + # rebuild saved psr - execve will change it for init/main.c srli gr22,#1,gr5 andi.p gr22,#~PSR_PS,gr22 andi gr5,#PSR_PS,gr5 or gr5,gr22,gr22 - ori gr22,#PSR_S,gr22 - - # keep current PSR in GR23 - movsg psr,gr23 + ori.p gr22,#PSR_S,gr22 # make sure we don't miss an interrupt setting need_resched or sigpending between # sampling and the RETT |
