do_sigreturn.c

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    1 /* The kernel call that is implemented in this file:
    2  *   m_type:    SYS_SIGRETURN
    3  *
    4  * The parameters for this kernel call are:
    5  *     m2_i1:   SIG_PROC        # process returning from handler
    6  *     m2_p1:   SIG_CTXT_PTR    # pointer to sigcontext structure
    7  *
    8  */
    9 
   10 #include "../system.h"
   11 #include <string.h>
   12 #include <signal.h>
   13 #include <sys/sigcontext.h>
   14 
   15 #if USE_SIGRETURN 
   16 
   17 /*===========================================================================*
   18  *                            do_sigreturn                                   *
   19  *===========================================================================*/
   20 PUBLIC int do_sigreturn(m_ptr)
   21 message *m_ptr;                 /* pointer to request message */
   22 {
   23 /* POSIX style signals require sys_sigreturn to put things in order before 
   24  * the signalled process can resume execution
   25  */
   26   struct sigcontext sc;
   27   register struct proc *rp;
   28   phys_bytes src_phys;
   29 
   30   if (! isokprocn(m_ptr->SIG_PROC)) return(EINVAL);
   31   if (iskerneln(m_ptr->SIG_PROC)) return(EPERM);
   32   rp = proc_addr(m_ptr->SIG_PROC);
   33 
   34   /* Copy in the sigcontext structure. */
   35   src_phys = umap_local(rp, D, (vir_bytes) m_ptr->SIG_CTXT_PTR,
   36       (vir_bytes) sizeof(struct sigcontext));
   37   if (src_phys == 0) return(EFAULT);
   38   phys_copy(src_phys, vir2phys(&sc), (phys_bytes) sizeof(struct sigcontext));
   39 
   40   /* Make sure that this is not just a jump buffer. */
   41   if ((sc.sc_flags & SC_SIGCONTEXT) == 0) return(EINVAL);
   42 
   43   /* Fix up only certain key registers if the compiler doesn't use
   44    * register variables within functions containing setjmp.
   45    */
   46   if (sc.sc_flags & SC_NOREGLOCALS) {
   47       rp->p_reg.retreg = sc.sc_retreg;
   48       rp->p_reg.fp = sc.sc_fp;
   49       rp->p_reg.pc = sc.sc_pc;
   50       rp->p_reg.sp = sc.sc_sp;
   51       return(OK);
   52   }
   53   sc.sc_psw  = rp->p_reg.psw;
   54 
   55 #if (CHIP == INTEL)
   56   /* Don't panic kernel if user gave bad selectors. */
   57   sc.sc_cs = rp->p_reg.cs;
   58   sc.sc_ds = rp->p_reg.ds;
   59   sc.sc_es = rp->p_reg.es;
   60 #if _WORD_SIZE == 4
   61   sc.sc_fs = rp->p_reg.fs;
   62   sc.sc_gs = rp->p_reg.gs;
   63 #endif
   64 #endif
   65 
   66   /* Restore the registers. */
   67   memcpy(&rp->p_reg, &sc.sc_regs, sizeof(struct sigregs));
   68   return(OK);
   69 }
   70 #endif /* USE_SIGRETURN */
   71

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FreeBSD/Linux Kernel Cross Reference sys/kernel/system/do_sigreturn.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/system/do_sigreturn.c