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- Don't dink with sched_lock in cpu_switch() since mi_switch() does this

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for us.
- Change the switch_trampoline() to call fork_exit() passing in the
  required arguments instead of calling the fork trampoline callout
  function directly.
Warning: this hasn't been tested.

Looked over by:	dfr
This commit is contained in:
John Baldwin 2001-02-22 16:05:09 +00:00
parent 0246af0995
commit 29182967ef
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=72898
1 changed files with 15 additions and 24 deletions
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39
sys/ia64/ia64/swtch.s
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@ -205,13 +205,7 @@ ENTRY(cpu_switch, 0)
st8 [r17]=r18,8 ;; // ar.bspstore
st8 [r17]=r19,8 ;; // our NaT bits
st8 [r17]=r16,8 ;; // ar.rnat
st8 [r17]=r20,8 ;; // pr
addl r15=@ltoff(sched_lock),gp ;;
ld8 r15=[r15] ;;
add r15=MTX_RECURSE,r15 ;;
ld4 r15=[r15] ;;
st8 [r17]=r15 ;; // save sched_lock.mtx_recurse
st8 [r17]=r20 ;; // pr
mov ar.rsc=3 // turn RSE back on
@ -283,7 +277,7 @@ ENTRY(cpu_switch, 0)
ld8 r17=[r15],8 ;; // ar.pfs
ld8 r18=[r15],16 ;; // ar.bspstore, skip ar.unat
ld8 r19=[r15],8 ;; // ar.rnat
ld8 r20=[r15],8 ;; // pr
ld8 r20=[r15] ;; // pr
mov ar.unat=r16
mov ar.pfs=r17
@ -296,12 +290,6 @@ ENTRY(cpu_switch, 0)
mov ar.rsc=3 // restart RSE
invala
;;
ld8 r14=[r15] // restore sched_lock.mtx_recurse
addl r16=@ltoff(sched_lock),gp ;;
ld8 r15=[r16] ;;
add r15=MTX_RECURSE,r15 ;;
st4 [r15]=r14
9:
br.ret.sptk.few rp
@ -628,19 +616,22 @@ END(restorehighfp)
*
* Arrange for a function to be invoked neatly, after a cpu_switch().
*
* Invokes the function specified by the r4 register with the return
* address specified by the r5 register and with one argument, taken
* from r6.
* Invokes fork_exit() passing in three arguments: a callout function, an
* argument to the callout, and a trapframe pointer. For child processes
* returning from fork(2), the argument is a pointer to the child process.
*
* The callout function is in r4, the address to return to after executing
* fork_exit() is in r5, and the argument is in r6.
*/
ENTRY(switch_trampoline, 0)
MTX_EXIT(sched_lock, r14, r15)
alloc r14=ar.pfs,0,0,1,0
mov b7=r4
mov b0=r5
mov out0=r6
alloc r14=ar.pfs,0,0,3,0
;;
br.call.sptk.few b6=b7
mov b0=r5
mov out0=r4
mov out1=r6
mov out2=sp
;;
br.call.sptk.few b6=fork_exit
END(switch_trampoline)