5b8b623765
- when a process is migrated to a different CPU it may have an active FPU context in the processor registers. We must save it and migrate it together with the process.
100 lines
3 KiB
C
100 lines
3 KiB
C
/* The kernel call that is implemented in this file:
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* m_type: SYS_SIGSEND
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*
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* The parameters for this kernel call are:
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* m2_i1: SIG_ENDPT # process to call signal handler
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* m2_p1: SIG_CTXT_PTR # pointer to sigcontext structure
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* m2_i3: SIG_FLAGS # flags for S_SIGRETURN call
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*
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*/
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#include "kernel/system.h"
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#include <signal.h>
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#include <string.h>
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#include <sys/sigcontext.h>
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#if USE_SIGSEND
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/*===========================================================================*
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* do_sigsend *
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*===========================================================================*/
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PUBLIC int do_sigsend(struct proc * caller, message * m_ptr)
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{
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/* Handle sys_sigsend, POSIX-style signal handling. */
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struct sigmsg smsg;
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register struct proc *rp;
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struct sigcontext sc, *scp;
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struct sigframe fr, *frp;
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int proc_nr, r;
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if (!isokendpt(m_ptr->SIG_ENDPT, &proc_nr)) return(EINVAL);
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if (iskerneln(proc_nr)) return(EPERM);
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rp = proc_addr(proc_nr);
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/* Get the sigmsg structure into our address space. */
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if((r=data_copy_vmcheck(caller, caller->p_endpoint,
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(vir_bytes) m_ptr->SIG_CTXT_PTR, KERNEL, (vir_bytes) &smsg,
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(phys_bytes) sizeof(struct sigmsg))) != OK)
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return r;
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/* Compute the user stack pointer where sigcontext will be stored. */
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scp = (struct sigcontext *) smsg.sm_stkptr - 1;
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/* Copy the registers to the sigcontext structure. */
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memcpy(&sc.sc_regs, (char *) &rp->p_reg, sizeof(sigregs));
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#if (_MINIX_CHIP == _CHIP_INTEL)
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if(proc_used_fpu(rp)) {
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/* save the FPU context before saving it to the sig context */
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save_fpu(rp);
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memcpy(&sc.sc_fpu_state, rp->p_fpu_state.fpu_save_area_p,
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FPU_XFP_SIZE);
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}
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#endif
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/* Finish the sigcontext initialization. */
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sc.sc_mask = smsg.sm_mask;
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sc.sc_flags = 0 | rp->p_misc_flags & MF_FPU_INITIALIZED;
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/* Copy the sigcontext structure to the user's stack. */
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if((r=data_copy_vmcheck(caller, KERNEL, (vir_bytes) &sc, m_ptr->SIG_ENDPT,
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(vir_bytes) scp, (vir_bytes) sizeof(struct sigcontext))) != OK)
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return r;
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/* Initialize the sigframe structure. */
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frp = (struct sigframe *) scp - 1;
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fr.sf_scpcopy = scp;
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fr.sf_retadr2= (void (*)()) rp->p_reg.pc;
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fr.sf_fp = rp->p_reg.fp;
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rp->p_reg.fp = (reg_t) &frp->sf_fp;
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fr.sf_scp = scp;
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fpu_sigcontext(rp, &fr, &sc);
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fr.sf_signo = smsg.sm_signo;
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fr.sf_retadr = (void (*)()) smsg.sm_sigreturn;
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/* Copy the sigframe structure to the user's stack. */
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if((r=data_copy_vmcheck(caller, KERNEL, (vir_bytes) &fr,
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m_ptr->SIG_ENDPT, (vir_bytes) frp,
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(vir_bytes) sizeof(struct sigframe))) != OK)
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return r;
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/* Reset user registers to execute the signal handler. */
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rp->p_reg.sp = (reg_t) frp;
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rp->p_reg.pc = (reg_t) smsg.sm_sighandler;
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/* Signal handler should get clean FPU. */
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rp->p_misc_flags &= ~MF_FPU_INITIALIZED;
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if(!RTS_ISSET(rp, RTS_PROC_STOP)) {
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printf("system: warning: sigsend a running process\n");
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printf("caller stack: ");
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proc_stacktrace(caller);
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}
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return(OK);
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}
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#endif /* USE_SIGSEND */
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