This is the machine specific register contents for the thread at the time of the exception.

typedef struct _CONTEXTRECORD (POWERPC) {
  ULONG     ctx_Reg_gpr[32];
  ULONG     ctx_Reg_iar;
  ULONG     ctx_Reg_msr;
  ULONG     ctx_Reg_cr;
  ULONG     ctx_Reg_lr;
  ULONG     ctx_Reg_ctr;
  ULONG     ctx_Reg_xer;
  ULONG     ctx_Reg_mq;
} CONTEXTRECORD (POWERPC);

typedef   CONTEXTRECORD   ( POWERPC )   * PCONTEXTRECORD ;