cp/nucleus/pgm.c

   1 /*
   2  * Copyright (c) 2007-2019 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <interrupt.h>
  28 #include <symtab.h>
  29 #include <sclp.h>
  30 #include <mm.h>
  31
  32 struct stack_frame {
  33         u64 back_chain;
  34         u64 reserved;
  35         u64 gpr[14];  /* GPR 2..GPR 15 */
  36         u64 fpr[4];   /* FPR 0, 2, 4, 6 */
  37 };
  38
  39 /*
  40  * NOTE: Be *very* careful not to deref something we're not supposed to, we
  41  * don't want to recursively PROG.
  42  */
  43 static void dump_stack(u64 addr)
  44 {
  45         char buf[64];
  46         struct stack_frame *cur;
  47         u64 start, end;
  48         u64 ra;
  49
  50         sclp_msg("Stack trace:\n");
  51
  52         if (addr > memsize)
  53                 return;
  54
  55         addr &= ~0x7ull;
  56
  57         start = addr;
  58         end = (addr & ~PAGE_MASK) + PAGE_SIZE - sizeof(struct stack_frame);
  59
  60         cur = (struct stack_frame*) addr;
  61
  62         while(((u64)cur) >= start && ((u64)cur) < end) {
  63                 ra = cur->gpr[12];
  64
  65                 sclp_msg("   %016lx   %-s\n", ra,
  66                          symtab_lookup(ra, buf, sizeof(buf)));
  67
  68                 if (!cur->back_chain)
  69                         break;
  70
  71                 cur = (struct stack_frame*) cur->back_chain;
  72         }
  73 }
  74
  75 /*
  76  * All is lost! All hands abandon ship!
  77  *
  78  * Try to write out a message to a special buffer to help debugging, and
  79  * then stop the CPU.
  80  */
  81 static void abend(void)
  82 {
  83         int i;
  84
  85         sclp_msg("ABEND\n");
  86         sclp_msg("PROG %04x, ILC %d\n", *PGM_INT_CODE, (*PGM_INT_ILC) >> 1);
  87         sclp_msg("\n");
  88         for(i=0; i<8; i++)
  89                 sclp_msg("R%-2d = %016lx        R%-2d = %016lx\n",
  90                          i, PSA_INT_GPR[i], i+8, PSA_INT_GPR[i+8]);
  91         sclp_msg("\n");
  92         sclp_msg("PSW = %016lx %016lx\n",
  93                 *((u64*) PGM_INT_OLD_PSW), *(((u64*) PGM_INT_OLD_PSW)+1));
  94         sclp_msg("\n");
  95         dump_stack(PSA_INT_GPR[15]);
  96
  97         /*
  98          * halt the cpu
  99          *
 100          * NOTE: we don't care about not clobbering registers as when this
 101          * code executes, the CPU will be stopped.
 102          */
 103         asm volatile(
 104                 "SR     %r1, %r1        # not used, but should be zero\n"
 105                 "SR     %r3, %r3        # CPU Address\n"
 106                 "SIGP   %r1, %r3, 0x05  # Signal, order 0x05\n"
 107         );
 108
 109         /*
 110          * If SIGP failed, loop forever
 111          */
 112         for(;;);
 113 }
 114
 115 void __pgm_int_handler(void)
 116 {
 117         abend();
 118 }