60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_EXEC
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (process that did exec call)
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* m1_p1: PR_STACK_PTR (new stack pointer)
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* m1_p2: PR_NAME_PTR (pointer to program name)
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* m1_p3: PR_IP_PTR (new instruction pointer)
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*/
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#include "../system.h"
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#include <string.h>
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#include <signal.h>
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#if USE_EXEC
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/*===========================================================================*
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* do_exec *
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*===========================================================================*/
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PUBLIC int do_exec(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
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register struct proc *rp;
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reg_t sp; /* new sp */
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phys_bytes phys_name;
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char *np;
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rp = proc_addr(m_ptr->PR_PROC_NR);
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sp = (reg_t) m_ptr->PR_STACK_PTR;
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rp->p_reg.sp = sp; /* set the stack pointer */
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#if (CHIP == M68000)
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rp->p_splow = sp; /* set the stack pointer low water */
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#ifdef FPP
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/* Initialize fpp for this process */
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fpp_new_state(rp);
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#endif
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#endif
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#if (CHIP == INTEL) /* wipe extra LDT entries */
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phys_memset(vir2phys(&rp->p_ldt[EXTRA_LDT_INDEX]), 0,
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(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
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#endif
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rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
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rp->p_rts_flags &= ~RECEIVING; /* PM does not reply to EXEC call */
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if (rp->p_rts_flags == 0) lock_enqueue(rp);
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/* Save command name for debugging, ps(1) output, etc. */
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phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
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(vir_bytes) P_NAME_LEN - 1);
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if (phys_name != 0) {
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phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
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for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
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*np = 0; /* mark end */
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} else {
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strncpy(rp->p_name, "<unset>", P_NAME_LEN);
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}
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return(OK);
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}
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#endif /* USE_EXEC */
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