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("$FreeBSD$");
    
    #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 GDB_REG_RAX: return (&kdb_frame->tf_rax);
                    case GDB_REG_RCX: return (&kdb_frame->tf_rcx);
                    case GDB_REG_RDX: return (&kdb_frame->tf_rdx);
                    case GDB_REG_RSI: return (&kdb_frame->tf_rsi);
                    case GDB_REG_RDI: return (&kdb_frame->tf_rdi);
                    case GDB_REG_R8:  return (&kdb_frame->tf_r8);
                    case GDB_REG_R9:  return (&kdb_frame->tf_r9);
                    case GDB_REG_R10: return (&kdb_frame->tf_r10);
                    case GDB_REG_R11: return (&kdb_frame->tf_r11);
                    case GDB_REG_RFLAGS: return (&kdb_frame->tf_rflags);
                    case GDB_REG_CS:  return (&kdb_frame->tf_cs);
                    case GDB_REG_SS:  return (&kdb_frame->tf_ss);
                    }
            }
            switch (regnum) {
            case GDB_REG_RBX: return (&kdb_thrctx->pcb_rbx);
            case GDB_REG_RBP: return (&kdb_thrctx->pcb_rbp);
            case GDB_REG_RSP: return (&kdb_thrctx->pcb_rsp);
            case GDB_REG_R12: return (&kdb_thrctx->pcb_r12);
            case GDB_REG_R13: return (&kdb_thrctx->pcb_r13);
            case GDB_REG_R14: return (&kdb_thrctx->pcb_r14);
            case GDB_REG_R15: return (&kdb_thrctx->pcb_r15);
            case GDB_REG_PC:  return (&kdb_thrctx->pcb_rip);
            case GDB_REG_CS:  return (&_kcodesel);
            case GDB_REG_SS:  return (&_kdatasel);
            }
            return (NULL);
    }
    
    void
    gdb_cpu_setreg(int regnum, void *val)
    {
            register_t regval = *(register_t *)val;
    
            /*
             * Write registers to the trapframe and pcb, if applicable.
             * Some scratch registers are not tracked by the pcb.
            */
           if (kdb_thread == curthread) {
                   switch (regnum) {
                   case GDB_REG_RAX: kdb_frame->tf_rax = regval; break;
                   case GDB_REG_RBX: kdb_frame->tf_rbx = regval; break;
                   case GDB_REG_RCX: kdb_frame->tf_rcx = regval; break;
                   case GDB_REG_RDX: kdb_frame->tf_rdx = regval; break;
                   case GDB_REG_RSI: kdb_frame->tf_rsi = regval; break;
                   case GDB_REG_RDI: kdb_frame->tf_rdi = regval; break;
                   case GDB_REG_RBP: kdb_frame->tf_rbp = regval; break;
                   case GDB_REG_RSP: kdb_frame->tf_rsp = regval; break;
                   case GDB_REG_R8:  kdb_frame->tf_r8  = regval; break;
                   case GDB_REG_R9:  kdb_frame->tf_r9  = regval; break;
                   case GDB_REG_R10: kdb_frame->tf_r10 = regval; break;
                   case GDB_REG_R11: kdb_frame->tf_r11 = regval; break;
                   case GDB_REG_R12: kdb_frame->tf_r12 = regval; break;
                   case GDB_REG_R13: kdb_frame->tf_r13 = regval; break;
                   case GDB_REG_R14: kdb_frame->tf_r14 = regval; break;
                   case GDB_REG_R15: kdb_frame->tf_r15 = regval; break;
                   case GDB_REG_PC:  kdb_frame->tf_rip = regval; break;
                   }
           }
           switch (regnum) {
           case GDB_REG_RBX: kdb_thrctx->pcb_rbx = regval; break;
           case GDB_REG_RBP: kdb_thrctx->pcb_rbp = regval; break;
           case GDB_REG_RSP: kdb_thrctx->pcb_rsp = regval; break;
           case GDB_REG_R12: kdb_thrctx->pcb_r12 = regval; break;
           case GDB_REG_R13: kdb_thrctx->pcb_r13 = regval; break;
           case GDB_REG_R14: kdb_thrctx->pcb_r14 = regval; break;
           case GDB_REG_R15: kdb_thrctx->pcb_r15 = regval; break;
           case GDB_REG_PC:  kdb_thrctx->pcb_rip = regval; break;
           }
   }
   
   int
   gdb_cpu_signal(int type, int code)
   {
   
           switch (type & ~T_USER) {
           case T_BPTFLT: return (SIGTRAP);
           case T_ARITHTRAP: return (SIGFPE);
           case T_PROTFLT: return (SIGSEGV);
           case T_TRCTRAP: return (SIGTRAP);
           case T_PAGEFLT: return (SIGSEGV);
           case T_DIVIDE: return (SIGFPE);
           case T_NMI: return (SIGTRAP);
           case T_FPOPFLT: return (SIGILL);
           case T_TSSFLT: return (SIGSEGV);
           case T_SEGNPFLT: return (SIGSEGV);
           case T_STKFLT: return (SIGSEGV);
           case T_XMMFLT: return (SIGFPE);
           }
           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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