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authorMichael I. Bushnell <mib@gnu.org>1994-05-04 19:01:50 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-05-04 19:01:50 +0000
commit2fa256b36881b63bc0450dbc3033e1c67030e0e9 (patch)
tree372ec67940a612373ea1d3edc7ab63ac11d15862
parentcec78df9c5b4537b1dc544f8587a41700843e977 (diff)
entered into RCS
-rw-r--r--libthreads/i386/csw.S102
1 files changed, 51 insertions, 51 deletions
diff --git a/libthreads/i386/csw.S b/libthreads/i386/csw.S
index efc739f0..52c44637 100644
--- a/libthreads/i386/csw.S
+++ b/libthreads/i386/csw.S
@@ -58,25 +58,25 @@
* void cproc_switch(int *cur, int *next, int *lock)
*/
ENTRY(cproc_switch)
- pushl %ebp / save ebp
- movl %esp,%ebp / set frame pointer to get arguments
- pushl %ebx / save ebx
- pushl %esi / esi
- pushl %edi / edi
- movl B_ARG0,%eax / get cur
- movl %esp,(%eax) / save current esp
- movl B_ARG2,%edx / get address of lock before switching
- / stacks
- movl B_ARG1,%eax / get next
- movl (%eax),%esp / get new stack pointer
- xorl %eax,%eax / unlock
- xchgl %eax,(%edx) / the lock - now old thread can run
+ pushl %ebp /* save ebp */
+ movl %esp,%ebp /* set frame pointer to get arguments */
+ pushl %ebx /* save ebx */
+ pushl %esi /* esi */
+ pushl %edi /* edi */
+ movl B_ARG0,%eax /* get cur */
+ movl %esp,(%eax) /* save current esp */
+ movl B_ARG2,%edx /* get address of lock before switching */
+ /* stacks */
+ movl B_ARG1,%eax /* get next */
+ movl (%eax),%esp /* get new stack pointer */
+ xorl %eax,%eax /* unlock */
+ xchgl %eax,(%edx) /* the lock - now old thread can run */
- popl %edi / restore di
- popl %esi / si
- popl %ebx / bx
- popl %ebp / and bp (don`t use "leave" - bp
- / still points to old stack)
+ popl %edi /* restore di */
+ popl %esi /* si */
+ popl %ebx /* bx */
+ popl %ebp /* and bp (don`t use "leave" - bp */
+ /* still points to old stack) */
ret
/*
@@ -89,21 +89,21 @@ ENTRY(cproc_switch)
* int *lock)
*/
ENTRY(cproc_start_wait)
- pushl %ebp / save ebp
- movl %esp,%ebp / set frame pointer
- pushl %ebx / save ebx
- pushl %esi / esi
- pushl %edi / edi
- movl B_ARG0,%eax / get cur
- movl %esp,(%eax) / save current esp
- movl B_ARG1,%eax / get child thread
- movl B_ARG3,%edx / point to lock before switching stack
- movl B_ARG2,%esp / get new stack
- pushl %eax / push child thread as argument
- movl $0,%ebp / (clear frame pointer)
- xorl %eax,%eax / unlock
- xchgl %eax,(%edx) / the lock - now old thread can run
- call _cproc_waiting / call cproc_waiting
+ pushl %ebp /* save ebp */
+ movl %esp,%ebp /* set frame pointer */
+ pushl %ebx /* save ebx */
+ pushl %esi /* esi */
+ pushl %edi /* edi */
+ movl B_ARG0,%eax /* get cur */
+ movl %esp,(%eax) /* save current esp */
+ movl B_ARG1,%eax /* get child thread */
+ movl B_ARG3,%edx /* point to lock before switching stack */
+ movl B_ARG2,%esp /* get new stack */
+ pushl %eax /* push child thread as argument */
+ movl $0,%ebp /* (clear frame pointer) */
+ xorl %eax,%eax /* unlock */
+ xchgl %eax,(%edx) /* the lock - now old thread can run */
+ call _cproc_waiting /* call cproc_waiting */
/*NOTREACHED*/
/*
@@ -114,26 +114,26 @@ ENTRY(cproc_start_wait)
* void cproc_prepare(cproc_t child, int *context, int stack)
*/
ENTRY(cproc_prepare)
- pushl %ebp / save ebp
- movl %esp,%ebp / set frame pointer
- movl B_ARG2,%edx / get child`s stack
+ pushl %ebp /* save ebp */
+ movl %esp,%ebp /* set frame pointer */
+ movl B_ARG2,%edx /* get child`s stack */
subl $28,%edx
- / make room for context:
- / 0 saved edi ()
- / 4 saved esi ()
- / 8 saved ebx ()
- / 12 saved ebp ()
- / 16 return PC from cproc_switch
- / 20 return PC from cthread_body
- / 24 argument to cthread_body
- movl $0,12(%edx) / clear frame pointer
+ /* make room for context: */
+ /* 0 saved edi () */
+ /* 4 saved esi () */
+ /* 8 saved ebx () */
+ /* 12 saved ebp () */
+ /* 16 return PC from cproc_switch */
+ /* 20 return PC from cthread_body */
+ /* 24 argument to cthread_body */
+ movl $0,12(%edx) /* clear frame pointer */
movl $_cthread_body,16(%edx)
- / resume at cthread_body
- movl $0,20(%edx) / fake return address from cthread_body
- movl B_ARG0,%ecx / get child thread pointer
- movl %ecx,24(%edx) / set as argument to cthread_body
- movl B_ARG1,%ecx / get pointer to context
- movl %edx,(%ecx) / save context
+ /* resume at cthread_body */
+ movl $0,20(%edx) /* fake return address from cthread_body */
+ movl B_ARG0,%ecx /* get child thread pointer */
+ movl %ecx,24(%edx) /* set as argument to cthread_body */
+ movl B_ARG1,%ecx /* get pointer to context */
+ movl %edx,(%ecx) /* save context */
leave
ret