arch/arm-cortex-m3/debug.c

   1 /* Author: Domen Puncer <domen@cba.si>.  License: WTFPL, see file LICENSE */
   2 #include <types.h>
   3 #include <stdio.h>
   4 #include <compiler.h>
   5 #include <arch/cm3_regs.h>
   6 #include <cbashell.h>
   7
   8 extern void _ram_start;
   9 extern void _ram_end;
  10
  11 static const char * const exceptions[] = {
  12         "Unknown",
  13         "Reset",
  14         "NMI",
  15         "Hard Fault",
  16         "Memory Management",
  17         "Bus Fault",
  18         "Usage Fault",
  19 };
  20
  21 static const char * const regnames[16] = { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  22                 "r8", "r9", "r10/sl", "r11/fp", "r12/ip", "sp", "lr", "pc" };
  23
  24 /* my precious debugging function
  25  * HardFault is triggered on ie. invalid memory access.
  26  * note: on IMPRECISERR, this doesn't help much. it just means that some
  27  * invalid access occured but possibly before (after/prediction?) PC
  28  */
  29 void generic_exception_handler_c(u32 *oldstack, u32 *newstack, unsigned exception)
  30 {
  31         int oldstack_valid = (oldstack >= (u32*)&_ram_start && oldstack < (u32*)&_ram_end);
  32         int i;
  33
  34         if (exception < ALEN(exceptions))
  35                 printf("%s was called, dumping regs:\n", exceptions[exception]);
  36         else
  37                 printf("Exception #%i was caled, dumping regs:\n", exception);
  38
  39         printf("new_lr\t0x%08x\n", newstack[8]);
  40         if (oldstack_valid) {
  41                 for (i=0; i<4; i++)
  42                         printf("%s\t0x%08x\t%i\n", regnames[i], oldstack[i], oldstack[i]);
  43         } else {
  44                 printf("sp\t%p (newstack:%p)\n", oldstack, newstack);
  45                 printf("sp is invalid, so some registers are missing\n");
  46         }
  47         for (i=0; i<8; i++)
  48                 printf("%s\t0x%08x\t%i\n", regnames[i+4], newstack[i], newstack[i]);
  49
  50         if (oldstack_valid) {
  51                 printf("r12/ip\t0x%08x\t%i\n", oldstack[4], oldstack[4]);
  52                 printf("sp\t%p\n", oldstack);
  53                 printf("lr\t0x%08x\n", oldstack[5]);
  54                 printf("pc\t0x%08x\n", oldstack[6]);
  55                 printf("xPSR\t0x%08x\n", oldstack[7]);
  56         }
  57
  58         printf("HFSR\t0x%08x\n", HFSR);
  59         if (MMAR != 0xe000ed34)
  60                 printf("MMAR\t0x%08x\n", MMAR);
  61         if (BFAR != 0xe000ed38)
  62                 printf("BFAR\t0x%08x\n", BFAR);
  63
  64         printf("\nentering cbashell\n");
  65         cbashell_init();
  66         while (1) {
  67                 int c;
  68                 c = getchar();
  69                 if (c >= 0)
  70                         cbashell_charraw(c);
  71         }
  72 }