| 1 | /* The kernel call implemented in this file:
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| 2 | * m_type: SYS_EXEC
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| 3 | *
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| 4 | * The parameters for this kernel call are:
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| 5 | * m1_i1: PR_PROC_NR (process that did exec call)
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| 6 | * m1_p1: PR_STACK_PTR (new stack pointer)
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| 7 | * m1_p2: PR_NAME_PTR (pointer to program name)
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| 8 | * m1_p3: PR_IP_PTR (new instruction pointer)
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| 9 | */
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| 10 | #include "../system.h"
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| 11 | #include <string.h>
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| 12 | #include <signal.h>
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| 13 |
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| 14 | #if USE_EXEC
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| 15 |
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| 16 | /*===========================================================================*
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| 17 | * do_exec *
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| 18 | *===========================================================================*/
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| 19 | PUBLIC int do_exec(m_ptr)
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| 20 | register message *m_ptr; /* pointer to request message */
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| 21 | {
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| 22 | /* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
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| 23 | register struct proc *rp;
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| 24 | reg_t sp; /* new sp */
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| 25 | phys_bytes phys_name;
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| 26 | char *np;
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| 27 |
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| 28 | rp = proc_addr(m_ptr->PR_PROC_NR);
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| 29 | sp = (reg_t) m_ptr->PR_STACK_PTR;
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| 30 | rp->p_reg.sp = sp; /* set the stack pointer */
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| 31 | phys_memset(vir2phys(&rp->p_ldt[EXTRA_LDT_INDEX]), 0,
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| 32 | (LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
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| 33 | rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
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| 34 | rp->p_rts_flags &= ~RECEIVING; /* PM does not reply to EXEC call */
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| 35 | if (rp->p_rts_flags == 0) lock_enqueue(rp);
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| 36 |
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| 37 | /* Save command name for debugging, ps(1) output, etc. */
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| 38 | phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
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| 39 | (vir_bytes) P_NAME_LEN - 1);
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| 40 | if (phys_name != 0) {
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| 41 | phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
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| 42 | for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
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| 43 | *np = 0; /* mark end */
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| 44 | } else {
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| 45 | strncpy(rp->p_name, "<unset>", P_NAME_LEN);
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| 46 | }
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| 47 | return(OK);
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| 48 | }
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| 49 | #endif /* USE_EXEC */
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