minix/lib/libc/arch/i386/sys-minix/_senda.S

#include <minix/ipcconst.h>
#include <machine/asm.h>

	MSGTAB = 8	/* message table */
	TABCOUNT = 12	/* number of entries in message table */

ENTRY(_senda_orig)
	push	%ebp
	movl	%esp, %ebp
	push	%ebx
	movl	TABCOUNT(%ebp), %eax	/* eax = count */
	movl	MSGTAB(%ebp), %ebx	/* ebx = table */
	movl	$SENDA, %ecx	/* _senda(table, count) */
	int	$IPCVEC	/* trap to the kernel */
	pop	%ebx
	pop	%ebp
	ret
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 01:09:11 +01:00			`#include <minix/ipcconst.h>`
Macros for symbols used in both ASM and C -The macros take care of prepending the leading underscore when necessary. 2010-08-17 18:44:07 +02:00			`#include <machine/asm.h>`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00
			`MSGTAB = 8 /* message table */`
			`TABCOUNT = 12 /* number of entries in message table */`

SYSENTER/SYSCALL support . add cpufeature detection of both . use it for both ipc and kernelcall traps, using a register for call number . SYSENTER/SYSCALL does not save any context, therefore userland has to save it . to accomodate multiple kernel entry/exit types, the entry type is recorded in the process struct. hitherto all types were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL is new, with the difference that context is not fully restored from proc struct when running the process again. this can't be done as some information is missing. . complication: cases in which the kernel has to fully change process context (i.e. sigreturn). in that case the exit type is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and context is fully restored from the proc struct. this does mean the PC and SP must change, as the sysenter/sysexit userland code will otherwise try to restore its own context. this is true in the sigreturn case. . override all usage by setting libc_ipc=1 2012-06-10 19:50:17 +02:00			`ENTRY(_senda_orig)`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00			`push %ebp`
			`movl %esp, %ebp`
			`push %ebx`
			`movl TABCOUNT(%ebp), %eax /* eax = count */`
			`movl MSGTAB(%ebp), %ebx /* ebx = table */`
			`movl $SENDA, %ecx /* _senda(table, count) */`
machine/ipcconst.h for arch-specific constants 2012-08-26 18:44:27 +02:00			`int $IPCVEC /* trap to the kernel */`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00			`pop %ebx`
			`pop %ebp`
			`ret`