FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/gdb_machdep.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2004 Marcel Moolenaar
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/amd64/amd64/gdb_machdep.c 331252 2018-03-20 17:43:50Z kib $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kdb.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/signal.h>
    
    #include <machine/cpufunc.h>
    #include <machine/frame.h>
    #include <machine/gdb_machdep.h>
    #include <machine/md_var.h>
    #include <machine/pcb.h>
    #include <machine/psl.h>
    #include <machine/reg.h>
    #include <machine/specialreg.h>
    #include <machine/trap.h>
    #include <machine/frame.h>
    #include <machine/endian.h>
    
    #include <gdb/gdb.h>
    
    void *
    gdb_cpu_getreg(int regnum, size_t *regsz)
    {
            static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
            static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
    
            *regsz = gdb_cpu_regsz(regnum);
    
            if (kdb_thread  == curthread) {
                    switch (regnum) {
                    case 0: return (&kdb_frame->tf_rax);
                    case 2: return (&kdb_frame->tf_rcx);
                    case 3: return (&kdb_frame->tf_rdx);
                    case 4: return (&kdb_frame->tf_rsi);
                    case 5: return (&kdb_frame->tf_rdi);
                    case 8: return (&kdb_frame->tf_r8);
                    case 9: return (&kdb_frame->tf_r9);
                    case 10: return (&kdb_frame->tf_r10);
                    case 11: return (&kdb_frame->tf_r11);
                    case 17: return (&kdb_frame->tf_rflags);
                    case 18: return (&kdb_frame->tf_cs);
                    case 19: return (&kdb_frame->tf_ss);
                    }
            }
            switch (regnum) {
            case 1:  return (&kdb_thrctx->pcb_rbx);
            case 6:  return (&kdb_thrctx->pcb_rbp);
            case 7:  return (&kdb_thrctx->pcb_rsp);
            case 12: return (&kdb_thrctx->pcb_r12);
            case 13: return (&kdb_thrctx->pcb_r13);
            case 14: return (&kdb_thrctx->pcb_r14);
            case 15: return (&kdb_thrctx->pcb_r15);
            case 16: return (&kdb_thrctx->pcb_rip);
            case 18: return (&_kcodesel);
            case 19: return (&_kdatasel);
            }
            return (NULL);
    }
    
    void
    gdb_cpu_setreg(int regnum, void *val)
    {
    
            switch (regnum) {
            case GDB_REG_PC:
                    kdb_thrctx->pcb_rip = *(register_t *)val;
                    if (kdb_thread  == curthread)
                           kdb_frame->tf_rip = *(register_t *)val;
           }
   }
   
   int
   gdb_cpu_signal(int type, int code)
   {
   
           switch (type & ~T_USER) {
           case 0: return (SIGFPE);        /* Divide by zero. */
           case 1: return (SIGTRAP);       /* Debug exception. */
           case 3: return (SIGTRAP);       /* Breakpoint. */
           case 4: return (SIGSEGV);       /* into instr. (overflow). */
           case 5: return (SIGURG);        /* bound instruction. */
           case 6: return (SIGILL);        /* Invalid opcode. */
           case 7: return (SIGFPE);        /* Coprocessor not present. */
           case 8: return (SIGEMT);        /* Double fault. */
           case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
           case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
           case 11: return (SIGSEGV);      /* Segment not present. */
           case 12: return (SIGSEGV);      /* Stack exception. */
           case 13: return (SIGSEGV);      /* General protection. */
           case 14: return (SIGSEGV);      /* Page fault. */
           case 16: return (SIGEMT);       /* Coprocessor error. */
           }
           return (SIGEMT);
   }
   
   void *
   gdb_begin_write(void)
   {
   
           return (disable_wp() ? &gdb_begin_write : NULL);
   }
   
   void
   gdb_end_write(void *arg)
   {
   
           restore_wp(arg != NULL);
   }
   

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