minix/lib/libsys/kernel_call.c

#include <lib.h>
#include <minix/syslib.h>

int _kernel_call(int syscallnr, message *msgptr)
{
  msgptr->m_type = syscallnr;
  do_kernel_call(msgptr);
  return(msgptr->m_type);
}
And of course, as much as I've tried to be careful I forgot to add this file in r6116 :( 2010-02-09 16:36:29 +01:00			`#include <lib.h>`
			`#include <minix/syslib.h>`

retire PUBLIC, PRIVATE and FORWARD 2012-03-25 20:25:53 +02:00			`int _kernel_call(int syscallnr, message *msgptr)`
And of course, as much as I've tried to be careful I forgot to add this file in r6116 :( 2010-02-09 16:36:29 +01:00			`{`
			`msgptr->m_type = syscallnr;`
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			`do_kernel_call(msgptr);`
And of course, as much as I've tried to be careful I forgot to add this file in r6116 :( 2010-02-09 16:36:29 +01:00			`return(msgptr->m_type);`
			`}`