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After discussing this further with uwe, rearange stack usage slightly and 

replace a comment with words suggested by him.
This commit is contained in:
martin 2006-12-27 13:40:56 +00:00
parent 431da137b1
commit f666b179b1
1 changed files with 13 additions and 11 deletions
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24
lib/libc/arch/sparc64/sys/__clone.S
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@ -1,4 +1,4 @@
/* $NetBSD: __clone.S,v 1.5 2006/12/25 21:44:37 martin Exp $ */
/* $NetBSD: __clone.S,v 1.6 2006/12/27 13:40:56 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -59,13 +59,17 @@ ENTRY(__clone)
mov %i2, %o0 ! setup flags arg for syscall
/*
* Store the function and the argument on our child's stack,
* subtract BIAS from childs stack pointer - it will be 64 bit
* code too. Allocate space for the initial frame too.
* Allocate "caller's" frame in the child stack as ABI
* requires. Subtract BIAS - it will be 64-bit code.
*
* We pass the function and the argument to the child by
* stashing them at the bottom of the frame. There they are
* safe from window spill would we need to take one as it's
* below the window save area.
*/
sub %o1, 16+CC64FSZ+BIAS, %o1 ! make space
stx %i0, [%o1+BIAS] ! save func
stx %i3, [%o1+8+BIAS] ! save arg
sub %o1, CC64FSZ+BIAS, %o1 ! make space
stx %i0, [%o1+CC64FSZ-16+BIAS] ! save func
stx %i3, [%o1+CC64FSZ-8+BIAS] ! save arg
/*
* Args are now set up for system call as (flags, stack).
@ -75,11 +79,9 @@ ENTRY(__clone)
bcs,pn %xcc, 9f
tst %o1 ! %o1 (rv[1]) == 0 in parent
bz %xcc, 2f ! yes, parent
ldx [%sp+BIAS], %l0 ! grab the function
ldx [%sp+8+BIAS], %o0 ! and the argument from the stack
add %sp, 16, %sp ! restore the stack
ldx [%sp+CC64FSZ-16+BIAS], %l0 ! grab the function...
call %l0 ! Call the clone's entry point.
nop
ldx [%sp+CC64FSZ-8+BIAS], %o0 ! ...and the argument
JUMP(_exit)
/* NOTREACHED */