minix/lib/libc/arch/i386/rts/_ipc.S
Cristiano Giuffrida bde2109b7c IPC status code for receive().
IPC changes:
- receive() is changed to take an additional parameter, which is a pointer to
a status code.
- The status code is filled in by the kernel to provide additional information
to the caller. For now, the kernel only fills in the IPC call used by the
sender.

Syslib changes:
- sef_receive() has been split into sef_receive() (with the original semantics)
and sef_receive_status() which exposes the status code to userland.
- Ideally, every sys process should gradually switch to sef_receive_status()
and use is_ipc_notify() as a dependable way to check for notify.
- SEF has been modified to use is_ipc_notify() and demonstrate how to use the
new status code.
2010-03-23 00:09:11 +00:00

82 lines
2 KiB
ArmAsm

#include <minix/ipcconst.h>
.globl __notify, __send, __senda, __sendnb, __receive, __sendrec, __do_kernel_call
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. */
.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 */
movl STATUS(%ebp), %ecx /* ecx = status pointer */
movl %ebx, (%ecx)
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