minix/kernel/system/do_exec.c
Ben Gras c078ec0331 Basic VM and other minor improvements.
Not complete, probably not fully debugged or optimized.
2008-11-19 12:26:10 +00:00

48 lines
1.4 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_EXEC
*
* The parameters for this kernel call are:
* m1_i1: PR_ENDPT (process that did exec call)
* m1_p1: PR_STACK_PTR (new stack pointer)
* m1_p2: PR_NAME_PTR (pointer to program name)
* m1_p3: PR_IP_PTR (new instruction pointer)
*/
#include "../system.h"
#include <string.h>
#include <signal.h>
#include <minix/endpoint.h>
#if USE_EXEC
/*===========================================================================*
* do_exec *
*===========================================================================*/
PUBLIC int do_exec(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
register struct proc *rp;
phys_bytes phys_name;
char *np;
int proc;
if(!isokendpt(m_ptr->PR_ENDPT, &proc))
return EINVAL;
rp = proc_addr(proc);
/* Save command name for debugging, ps(1) output, etc. */
if(data_copy(who_e, (vir_bytes) m_ptr->PR_NAME_PTR,
SYSTEM, (vir_bytes) rp->p_name, (phys_bytes) P_NAME_LEN - 1) != OK)
strncpy(rp->p_name, "<unset>", P_NAME_LEN);
/* Do architecture-specific exec() stuff. */
arch_pre_exec(rp, (u32_t) m_ptr->PR_IP_PTR, (u32_t) m_ptr->PR_STACK_PTR);
/* No reply to EXEC call */
RTS_LOCK_UNSET(rp, RECEIVING);
return(OK);
}
#endif /* USE_EXEC */