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.file "asm-NetBSD-386.S"
#include <sys/syscall.h>
/*
* executeonnewstack(void *tos, void (*tramp)(void *arg), void *arg)
*/
.type ournewstack,@function
.global executeonnewstack
executeonnewstack:
pushl %ebp
movl %esp, %ebp
pushl %esi
movl 8(%ebp), %esi /* get tos */
subl $4, %esi
movl 16(%ebp), %eax
movl %eax, (%esi) /* stash arg on new stack */
subl $4, %esi
movl 12(%ebp), %eax
movl %eax, (%esi) /* stash tramp on new stack */
mov %esi, %esp /* swap stacks pronto */
popl %eax /* recover the tramp address */
call *%eax /* and jump to it (ho ho) */
/* if we return here, tramp didn't do it's job */
addl $8, %esp /* clean up for pose value */
leal SYS_exit, %eax
int $0x80
/*
* unlockandexit(int *key)
*
* NB: the return status may be rubbish if the stack is reused
* between the unlock and the system call, but this should
* not matter since no task is waiting for the result
*/
.type unlockandexit,@function
.global unlockandexit
unlockandexit:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %esi /* get the key address */
pushl $0 /* exit status 0 */
movl $0, %eax /* unlock the stack allocator */
movl %eax, (%esi)
leal SYS_exit, %eax /* call exit */
int $0x80
/*
* umult(ulong m1, ulong m2, ulong *hi)
*/
.type umult,@function
.global umult
umult:
pushl %ebp
movl %esp, %ebp
pushl %ebx
movl 8(%ebp), %eax
movl 12(%ebp), %ebx
mull %ebx
movl 16(%ebp), %ebx
movl %edx, (%ebx)
popl %ebx
popl %ebp
ret
.type FPsave,@function
.global FPsave
FPsave:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %eax
fstenv (%eax)
popl %ebp
ret
.type FPrestore,@function
.global FPrestore
FPrestore:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %eax
fldenv (%eax)
popl %ebp
ret
.type _tas,@function
.globl _tas
_tas:
movl $1, %eax
movl 4(%esp), %ecx
xchgl %eax, 0(%ecx)
ret
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