[RFC] Attempt to clean up sigsuspend et al

[David Woodhouse]

On Sun, 2005-11-13 at 17:58 +1100, Paul Mackerras wrote:
> I'll be upset if you can shorten it by a lot - I thought I had it
> pretty tight already. :)

The patch appears to speed up a null syscall benchmark by about 3%.

With the old kernel I get an average of 5863600 cycles for 100000
getpid() calls; with the new kernel it's 5695256 cycles.

I still haven't done much testing for correctness, but it needs at least
this (d'oh)...

--- arch/powerpc/kernel/entry_64.S~	2005-11-14 23:41:22.000000000 +0000
+++ arch/powerpc/kernel/entry_64.S	2005-11-14 23:45:35.000000000 +0000
@@ -295,7 +295,7 @@ save_user_nvgprs:
 	ori	r10,r10,MSR_EE
 	mtmsrd	r10,1
 
-	ld	r10,TI_SIGFRAME(r9)
+	ld	r10,TI_SIGFRAME(r12)
 	andi.	r0,r9,_TIF_32BIT
 	beq-	save_user_nvgprs_64
 


-- 
dwmw2

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	.globl main

main:
	subi 1,1,12
	stw 14,0(1)
	stw 15,4(1)
	stw 16,8(1)
	
	li 14, 10000
	mftb 15
1:	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	li 0, 24
	sc
	addic. 14,14,-1
	bne	1b
	mftb 16
	sub 4,16,15
	lwz 14,0(1)
	lwz 15,4(1)
	lwz 16,8(1)
	addi 1,1,12
	lis 3,msg at ha
	la 3,msg at l(3)
	b printf

msg:	.string "Used %d cycles\n"