traps.c 5.6 KB

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  1. /*
  2. * linux/arch/powerpc/kernel/traps.c
  3. *
  4. * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  5. *
  6. * Modified by Cort Dougan (cort@cs.nmt.edu)
  7. * and Paul Mackerras (paulus@cs.anu.edu.au)
  8. * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
  9. *
  10. * (C) Copyright 2000-2003
  11. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  12. *
  13. * See file CREDITS for list of people who contributed to this
  14. * project.
  15. *
  16. * This program is free software; you can redistribute it and/or
  17. * modify it under the terms of the GNU General Public License as
  18. * published by the Free Software Foundation; either version 2 of
  19. * the License, or (at your option) any later version.
  20. *
  21. * This program is distributed in the hope that it will be useful,
  22. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24. * GNU General Public License for more details.
  25. *
  26. * You should have received a copy of the GNU General Public License
  27. * along with this program; if not, write to the Free Software
  28. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29. * MA 02111-1307 USA
  30. */
  31. /*
  32. * This file handles the architecture-dependent parts of hardware exceptions
  33. */
  34. #include <common.h>
  35. #include <command.h>
  36. #include <kgdb.h>
  37. #include <asm/processor.h>
  38. /* Returns 0 if exception not found and fixup otherwise. */
  39. extern unsigned long search_exception_table(unsigned long);
  40. /* THIS NEEDS CHANGING to use the board info structure.
  41. */
  42. #define END_OF_MEM 0x02000000
  43. /*
  44. * Trap & Exception support
  45. */
  46. void
  47. print_backtrace(unsigned long *sp)
  48. {
  49. int cnt = 0;
  50. unsigned long i;
  51. printf("Call backtrace: ");
  52. while (sp) {
  53. if ((uint)sp > END_OF_MEM)
  54. break;
  55. i = sp[1];
  56. if (cnt++ % 7 == 0)
  57. printf("\n");
  58. printf("%08lX ", i);
  59. if (cnt > 32) break;
  60. sp = (unsigned long *)*sp;
  61. }
  62. printf("\n");
  63. }
  64. void show_regs(struct pt_regs * regs)
  65. {
  66. int i;
  67. printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  68. regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  69. printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  70. regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
  71. regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
  72. regs->msr&MSR_IR ? 1 : 0,
  73. regs->msr&MSR_DR ? 1 : 0);
  74. printf("\n");
  75. for (i = 0; i < 32; i++) {
  76. if ((i % 8) == 0)
  77. {
  78. printf("GPR%02d: ", i);
  79. }
  80. printf("%08lX ", regs->gpr[i]);
  81. if ((i % 8) == 7)
  82. {
  83. printf("\n");
  84. }
  85. }
  86. }
  87. void
  88. _exception(int signr, struct pt_regs *regs)
  89. {
  90. show_regs(regs);
  91. print_backtrace((unsigned long *)regs->gpr[1]);
  92. panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
  93. }
  94. void
  95. MachineCheckException(struct pt_regs *regs)
  96. {
  97. unsigned long fixup;
  98. /* Probing PCI using config cycles cause this exception
  99. * when a device is not present. Catch it and return to
  100. * the PCI exception handler.
  101. */
  102. if ((fixup = search_exception_table(regs->nip)) != 0) {
  103. regs->nip = fixup;
  104. return;
  105. }
  106. #if defined(CONFIG_CMD_KGDB)
  107. if (debugger_exception_handler && (*debugger_exception_handler)(regs))
  108. return;
  109. #endif
  110. printf("Machine check in kernel mode.\n");
  111. printf("Caused by (from msr): ");
  112. printf("regs %p ",regs);
  113. /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
  114. switch( regs->msr & 0x000F0000)
  115. {
  116. case (0x80000000>>12) :
  117. printf("Machine check signal - probably due to mm fault\n"
  118. "with mmu off\n");
  119. break;
  120. case (0x80000000>>13) :
  121. printf("Transfer error ack signal\n");
  122. break;
  123. case (0x80000000>>14) :
  124. printf("Data parity signal\n");
  125. break;
  126. case (0x80000000>>15) :
  127. printf("Address parity signal\n");
  128. break;
  129. default:
  130. printf("Unknown values in msr\n");
  131. }
  132. show_regs(regs);
  133. print_backtrace((unsigned long *)regs->gpr[1]);
  134. panic("machine check");
  135. }
  136. void
  137. AlignmentException(struct pt_regs *regs)
  138. {
  139. #if defined(CONFIG_CMD_KGDB)
  140. if (debugger_exception_handler && (*debugger_exception_handler)(regs))
  141. return;
  142. #endif
  143. show_regs(regs);
  144. print_backtrace((unsigned long *)regs->gpr[1]);
  145. panic("Alignment Exception");
  146. }
  147. void
  148. ProgramCheckException(struct pt_regs *regs)
  149. {
  150. #if defined(CONFIG_CMD_KGDB)
  151. if (debugger_exception_handler && (*debugger_exception_handler)(regs))
  152. return;
  153. #endif
  154. show_regs(regs);
  155. print_backtrace((unsigned long *)regs->gpr[1]);
  156. panic("Program Check Exception");
  157. }
  158. void
  159. SoftEmuException(struct pt_regs *regs)
  160. {
  161. #if defined(CONFIG_CMD_KGDB)
  162. if (debugger_exception_handler && (*debugger_exception_handler)(regs))
  163. return;
  164. #endif
  165. show_regs(regs);
  166. print_backtrace((unsigned long *)regs->gpr[1]);
  167. panic("Software Emulation Exception");
  168. }
  169. void
  170. UnknownException(struct pt_regs *regs)
  171. {
  172. #if defined(CONFIG_CMD_KGDB)
  173. if (debugger_exception_handler && (*debugger_exception_handler)(regs))
  174. return;
  175. #endif
  176. printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
  177. regs->nip, regs->msr, regs->trap);
  178. _exception(0, regs);
  179. }
  180. #if defined(CONFIG_CMD_BEDBUG)
  181. extern void do_bedbug_breakpoint(struct pt_regs *);
  182. #endif
  183. void
  184. DebugException(struct pt_regs *regs)
  185. {
  186. printf("Debugger trap at @ %lx\n", regs->nip );
  187. show_regs(regs);
  188. #if defined(CONFIG_CMD_BEDBUG)
  189. do_bedbug_breakpoint( regs );
  190. #endif
  191. }
  192. /* Probe an address by reading. If not present, return -1, otherwise
  193. * return 0.
  194. */
  195. int
  196. addr_probe(uint *addr)
  197. {
  198. #if 0
  199. int retval;
  200. __asm__ __volatile__( \
  201. "1: lwz %0,0(%1)\n" \
  202. " eieio\n" \
  203. " li %0,0\n" \
  204. "2:\n" \
  205. ".section .fixup,\"ax\"\n" \
  206. "3: li %0,-1\n" \
  207. " b 2b\n" \
  208. ".section __ex_table,\"a\"\n" \
  209. " .align 2\n" \
  210. " .long 1b,3b\n" \
  211. ".text" \
  212. : "=r" (retval) : "r"(addr));
  213. return (retval);
  214. #endif
  215. return 0;
  216. }