728f0f0c49
* Userspace change to use the new kernel calls - _taskcall(SYSTASK...) changed to _kernel_call(...) - int 32 reused for the kernel calls - _do_kernel_call() to make the trap to kernel - kernel_call() to make the actuall kernel call from C using _do_kernel_call() - unlike ipc call the kernel call always succeeds as kernel is always available, however, kernel may return an error * Kernel side implementation of kernel calls - the SYSTEm task does not run, only the proc table entry is preserved - every data_copy(SYSTEM is no data_copy(KERNEL - "locking" is an empty operation now as everything runs in kernel - sys_task() is replaced by kernel_call() which copies the message into kernel, dispatches the call to its handler and finishes by either copying the results back to userspace (if need be) or by suspending the process because of VM - suspended processes are later made runnable once the memory issue is resolved, picked up by the scheduler and only at this time the call is resumed (in fact restarted) which does not need to copy the message from userspace as the message is already saved in the process structure. - no ned for the vmrestart queue, the scheduler will restart the system calls - no special case in do_vmctl(), all requests remove the RTS_VMREQUEST flag
132 lines
3.9 KiB
C
132 lines
3.9 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 "../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 (_MINIX_CHIP == _CHIP_INTEL)
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unsigned short int fp_error;
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#endif
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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(rp->p_misc_flags & MF_FPU_INITIALIZED)
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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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#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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#if (_MINIX_CHIP == _CHIP_INTEL)
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if (osfxsr_feature == 1) {
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fp_error = sc.sc_fpu_state.xfp_regs.fp_status &
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~sc.sc_fpu_state.xfp_regs.fp_control;
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} else {
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fp_error = sc.sc_fpu_state.fpu_regs.fp_status &
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~sc.sc_fpu_state.fpu_regs.fp_control;
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}
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if (fp_error & 0x001) { /* Invalid op */
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/*
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* swd & 0x240 == 0x040: Stack Underflow
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* swd & 0x240 == 0x240: Stack Overflow
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* User must clear the SF bit (0x40) if set
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*/
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fr.sf_code = FPE_FLTINV;
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} else if (fp_error & 0x004) {
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fr.sf_code = FPE_FLTDIV; /* Divide by Zero */
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} else if (fp_error & 0x008) {
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fr.sf_code = FPE_FLTOVF; /* Overflow */
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} else if (fp_error & 0x012) {
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fr.sf_code = FPE_FLTUND; /* Denormal, Underflow */
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} else if (fp_error & 0x020) {
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fr.sf_code = FPE_FLTRES; /* Precision */
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} else {
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fr.sf_code = 0; /* XXX - probably should be used for FPE_INTOVF or
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* FPE_INTDIV */
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}
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#else
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fr.sf_code = 0;
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#endif
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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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kprintf("system: warning: sigsend a running process\n");
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kprintf("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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