| 1 | /* The kernel call that is implemented in this file:
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| 2 | * m_type: SYS_SIGSEND
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| 3 | *
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| 4 | * The parameters for this kernel call are:
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| 5 | * m2_i1: SIG_ENDPT # process to call signal handler
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| 6 | * m2_p1: SIG_CTXT_PTR # pointer to sigcontext structure
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| 7 | * m2_i3: SIG_FLAGS # flags for S_SIGRETURN call
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | #include "../system.h"
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| 12 | #include <signal.h>
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| 13 | #include <string.h>
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| 14 | #include <sys/sigcontext.h>
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| 15 |
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| 16 | #if USE_SIGSEND
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| 17 |
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| 18 | /*===========================================================================*
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| 19 | * do_sigsend *
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| 20 | *===========================================================================*/
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| 21 | PUBLIC int do_sigsend(m_ptr)
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| 22 | message *m_ptr; /* pointer to request message */
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| 23 | {
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| 24 | /* Handle sys_sigsend, POSIX-style signal handling. */
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| 25 |
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| 26 | struct sigmsg smsg;
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| 27 | register struct proc *rp;
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| 28 | phys_bytes src_phys, dst_phys;
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| 29 | struct sigcontext sc, *scp;
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| 30 | struct sigframe fr, *frp;
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| 31 | int proc;
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| 32 |
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| 33 | if (!isokendpt(m_ptr->SIG_ENDPT, &proc)) return(EINVAL);
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| 34 | if (iskerneln(proc)) return(EPERM);
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| 35 | rp = proc_addr(proc);
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| 36 |
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| 37 | /* Get the sigmsg structure into our address space. */
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| 38 | src_phys = umap_local(proc_addr(PM_PROC_NR), D, (vir_bytes)
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| 39 | m_ptr->SIG_CTXT_PTR, (vir_bytes) sizeof(struct sigmsg));
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| 40 | if (src_phys == 0) return(EFAULT);
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| 41 | phys_copy(src_phys,vir2phys(&smsg),(phys_bytes) sizeof(struct sigmsg));
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| 42 |
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| 43 | /* Compute the user stack pointer where sigcontext will be stored. */
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| 44 | scp = (struct sigcontext *) smsg.sm_stkptr - 1;
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| 45 |
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| 46 | /* Copy the registers to the sigcontext structure. */
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| 47 | memcpy(&sc.sc_regs, (char *) &rp->p_reg, sizeof(struct sigregs));
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| 48 |
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| 49 | /* Finish the sigcontext initialization. */
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| 50 | sc.sc_flags = SC_SIGCONTEXT;
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| 51 | sc.sc_mask = smsg.sm_mask;
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| 52 |
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| 53 | /* Copy the sigcontext structure to the user's stack. */
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| 54 | dst_phys = umap_local(rp, D, (vir_bytes) scp,
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| 55 | (vir_bytes) sizeof(struct sigcontext));
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| 56 | if (dst_phys == 0) return(EFAULT);
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| 57 | phys_copy(vir2phys(&sc), dst_phys, (phys_bytes) sizeof(struct sigcontext));
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| 58 |
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| 59 | /* Initialize the sigframe structure. */
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| 60 | frp = (struct sigframe *) scp - 1;
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| 61 | fr.sf_scpcopy = scp;
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| 62 | fr.sf_retadr2= (void (*)()) rp->p_reg.pc;
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| 63 | fr.sf_fp = rp->p_reg.fp;
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| 64 | rp->p_reg.fp = (reg_t) &frp->sf_fp;
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| 65 | fr.sf_scp = scp;
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| 66 | fr.sf_code = 0; /* XXX - should be used for type of FP exception */
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| 67 | fr.sf_signo = smsg.sm_signo;
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| 68 | fr.sf_retadr = (void (*)()) smsg.sm_sigreturn;
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| 69 |
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| 70 | /* Copy the sigframe structure to the user's stack. */
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| 71 | dst_phys = umap_local(rp, D, (vir_bytes) frp,
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| 72 | (vir_bytes) sizeof(struct sigframe));
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| 73 | if (dst_phys == 0) return(EFAULT);
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| 74 | phys_copy(vir2phys(&fr), dst_phys, (phys_bytes) sizeof(struct sigframe));
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| 75 |
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| 76 | /* Reset user registers to execute the signal handler. */
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| 77 | rp->p_reg.sp = (reg_t) frp;
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| 78 | rp->p_reg.pc = (reg_t) smsg.sm_sighandler;
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| 79 |
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| 80 | return(OK);
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| 81 | }
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| 82 |
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| 83 | #endif /* USE_SIGSEND */
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| 84 |
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