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Clarify a comment.

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Requested by: jhb
This commit is contained in:
Doug Rabson 2001-10-09 19:50:29 +00:00
parent baadfb4c1e
commit 7e3e8e556f
1 changed files with 3 additions and 1 deletions
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4
sys/ia64/ia64/vm_machdep.c
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@ -255,7 +255,9 @@ cpu_fork(td1, p2, flags)
* will return to exception_restore(). Note that the
* child process doesn't stay in the kernel for long!
*
* XXX what is this +/- 16 stuff here?
* The extra 16 bytes subtracted from sp is part of the ia64
* ABI - a function can assume that the 16 bytes above sp are
* available as scratch space.
*/
td2->td_pcb->pcb_sp = (u_int64_t)p2tf - 16;
td2->td_pcb->pcb_r4 = (u_int64_t)fork_return;