minix/lib/libc/arch/i386/rts/_ipc.S
2010-03-03 14:27:30 +00:00

83 lines
2 KiB
ArmAsm

.globl __notify, __send, __senda, __sendnb, __receive, __sendrec, __do_kernel_call
/* See src/kernel/ipc.h for C definitions */
SEND = 1
RECEIVE = 2
SENDREC = 3
NOTIFY = 4
SENDNB = 5
IPCVEC = 33 /* ipc trap to kernel */
KERVEC = 32 /* syscall trap to kernel */
SRC_DST = 8 /* source/ destination process */
MESSAGE = 12 /* message pointer */
/**========================================================================* */
/* IPC assembly routines * */
/**========================================================================* */
/* all message passing routines save ebp, but destroy eax and ecx. */
.text
__send:
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SEND, %ecx /* _send(dest, ptr) */
int $IPCVEC /* trap to the kernel */
pop %ebx
pop %ebp
ret
__receive:
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $RECEIVE, %ecx /* _receive(src, ptr) */
int $IPCVEC /* trap to the kernel */
pop %ebx
pop %ebp
ret
__sendrec:
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SENDREC, %ecx /* _sendrec(srcdest, ptr) */
int $IPCVEC /* trap to the kernel */
pop %ebx
pop %ebp
ret
__notify:
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = destination */
movl $NOTIFY, %ecx /* _notify(srcdst) */
int $IPCVEC /* trap to the kernel */
pop %ebx
pop %ebp
ret
__sendnb:
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SENDNB, %ecx /* _sendnb(dest, ptr) */
int $IPCVEC /* trap to the kernel */
pop %ebx
pop %ebp
ret
__do_kernel_call:
/* pass the message pointer to kernel in the %eax register */
movl 4(%esp), %eax
int $KERVEC
ret