minix/lib/nbsd_libc/arch/i386/sys-minix/_ipc.S

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#include <minix/ipcconst.h>
#include <machine/asm.h>
IPCVEC = 33 /* ipc trap to kernel */
KERVEC = 32 /* syscall trap to kernel */
SRC_DST = 8 /* source/ destination process */
MESSAGE = 12 /* message pointer */
STATUS = 16 /* status pointer */
/**========================================================================* */
/* IPC assembly routines * */
/**========================================================================* */
/* all message passing routines save ebx, but destroy eax and ecx. */
ENTRY(_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
ENTRY(_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 */
movl STATUS(%ebp), %ecx /* ecx = status pointer */
movl %ebx, (%ecx)
pop %ebx
pop %ebp
ret
ENTRY(_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
ENTRY(_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
ENTRY(_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
ENTRY(_do_kernel_call)
/* pass the message pointer to kernel in the %eax register */
movl 4(%esp), %eax
int $KERVEC
ret