diff options
Diffstat (limited to 'libthreads')
| -rw-r--r-- | libthreads/i386/csw.S | 102 |
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 |