Kernel/arch/x86/errors.c

   1 /*
   2  * Acess2 - x86 Architecture
   3  * arch/x86/errors.c
   4  * - CPU Error Handler
   5  */
   6 #include <acess.h>
   7 #include <proc.h>
   8
   9 // === CONSTANTS ===
  10 #define MAX_BACKTRACE   8       //!< Maximum distance to trace the stack backwards
  11
  12 // === IMPORTS ===
  13 extern void     MM_PageFault(Uint Addr, Uint ErrorCode, tRegs *Regs);
  14 extern void     VM8086_GPF(tRegs *Regs);
  15 extern void     Threads_Dump(void);
  16 extern void     Threads_Fault(int Num);
  17 extern int      GetCPUNum(void);
  18 extern void     MM_DumpTables(tVAddr, tVAddr);
  19 extern void     Proc_EnableSSE(void);
  20 extern void     Proc_RestoreSSE(Uint32 Data);
  21
  22 // === PROTOTYPES ===
  23 void    __stack_chk_fail(void);
  24 void    ErrorHandler(tRegs *Regs);
  25 void    Proc_PrintBacktrace(void);
  26 void    Error_Backtrace(Uint eip, Uint ebp);
  27 void    StartupPrint(char *Str);
  28
  29 // === GLOBALS ===
  30 const char *csaERROR_NAMES[] = {
  31         "Divide By Zero", "Debug", "NMI Exception", "INT3",
  32         "INTO Instr - Overflow", "BOUND Instr - Out of Bounds", "Invalid Opcode", "Coprocessor not avaliable",
  33         "Double Fault", "Coprocessor Segment Overrun", "Bad TSS", "Segment Not Present",
  34         "Stack Fault Exception", "GPF", "#PF", "Reserved",
  35         "Floating Point Exception", "Alignment Check Exception", "Machine Check Exception",     "Reserved",
  36         "Reserved", "Reserved", "Reserved", "Reserved",
  37         "Reserved", "Reserved", "Reserved", "Reserved",
  38         "Reserved", "Reserved", "Reserved", "Reserved"
  39         };
  40
  41 // === CODE ===
  42 /**
  43  * \brief Keeps GCC happy
  44  */
  45 void __stack_chk_fail(void)
  46 {
  47         Panic("FATAL ERROR: Stack Check Failed\n");
  48         for(;;);
  49 }
  50
  51 /**
  52  * \fn void ErrorHandler(tRegs *Regs)
  53  * \brief General Error Handler
  54  * \param Regs  Register state at error
  55  */
  56 void ErrorHandler(tRegs *Regs)
  57 {
  58         Uint    cr;
  59
  60         //if( Regs && !(Regs->int_num == 13 && Regs->eflags & 0x20000) )
  61         //      __asm__ __volatile__ ("xchg %bx, %bx");
  62         //Log_Debug("X86", "Regs = %p", Regs);
  63         //Log_Debug("X86", "Error %i at 0x%08x", Regs->int_num, Regs->eip);
  64
  65         __asm__ __volatile__ ("cli");
  66
  67         // Debug exception (used for single-stepping)
  68         if(Regs->int_num == 1)
  69         {
  70                 static Uint32   lastEIP = 0;
  71                 tThread *thread = Proc_GetCurThread();
  72                 if( Regs->eip == lastEIP )
  73                         return;
  74                 Log("%p(%i %s) IP=%08x", thread, thread->TID, thread->ThreadName, Regs->eip);
  75                 lastEIP = Regs->eip;
  76                 return ;
  77         }
  78
  79         // Page Fault
  80         if(Regs->int_num == 14)
  81         {
  82                 __asm__ __volatile__ ("sti");   // Should be OK, TODO: Test
  83                 __asm__ __volatile__ ("mov %%cr2, %0":"=r"(cr));
  84                 MM_PageFault( cr, Regs->err_code, Regs );
  85                 return ;
  86         }
  87
  88         // #NM - Coprocessor unavaliable
  89         if(Regs->int_num == 7)
  90         {
  91                 tThread *thread = Proc_GetCurThread();
  92                 if(!thread->SavedState.bSSEModified)
  93                 {
  94                         Proc_EnableSSE();
  95                         if(!thread->SavedState.SSE)
  96                                 thread->SavedState.SSE = malloc(sizeof(tSSEState) + 0xF);
  97                         else
  98                                 Proc_RestoreSSE( ((Uint)thread->SavedState.SSE + 0xF) & ~0xF );
  99                         thread->SavedState.bSSEModified = 1;
 100                         __asm__ __volatile__ ("sti");
 101                         return ;
 102                 }
 103                 // oops, SSE enabled but a #NM, bad news
 104         }
 105
 106         // VM8086 GPF
 107         if(Regs->int_num == 13 && Regs->eflags & 0x20000)
 108         {
 109                 VM8086_GPF(Regs);
 110                 return ;
 111         }
 112
 113         // Check if it's a user mode fault
 114         if( Regs->eip < KERNEL_BASE || (Regs->cs & 3) == 3 ) {
 115                 Log_Warning("Arch", "User Fault -  %s, Code: 0x%x",
 116                         csaERROR_NAMES[Regs->int_num], Regs->err_code);
 117                 Log_Warning("Arch", "at CS:EIP %04x:%08x",
 118                         Regs->cs, Regs->eip);
 119                 MM_DumpTables(0, KERNEL_BASE);
 120                 switch( Regs->int_num )
 121                 {
 122                 // Division by Zero
 123                 case  0:        Threads_Fault(FAULT_DIV0);      break;
 124                 // Invalid opcode
 125                 case  6:        Threads_Fault(FAULT_OPCODE);    break;
 126                 // GPF
 127                 case 13:        Threads_Fault(FAULT_ACCESS);    break;
 128                 // Floating Point Exception
 129                 case 16:        Threads_Fault(FAULT_FLOAT);     break;
 130
 131                 default:        Threads_Fault(FAULT_MISC);      break;
 132                 }
 133                 return ;
 134         }
 135
 136         Debug_KernelPanic();
 137
 138         LogF("CPU %i Error %i - %s, Code: 0x%x - At %08x",
 139                 GetCPUNum(),
 140                 Regs->int_num, csaERROR_NAMES[Regs->int_num], Regs->err_code,
 141                 Regs->eip);
 142
 143         //Warning("CPU Error %i - %s, Code: 0x%x",
 144         //      Regs->int_num, csaERROR_NAMES[Regs->int_num], Regs->err_code);
 145         //Warning(" CS:EIP = 0x%04x:%08x", Regs->cs, Regs->eip);
 146         __ASM__ ("xchg %bx, %bx");
 147         if(Regs->cs == 0x08)
 148                 Warning(" SS:ESP = 0x0010:%08x", (Uint)Regs+sizeof(tRegs));
 149         else
 150                 Warning(" SS:ESP = 0x%04x:%08x", Regs->ss, Regs->esp);
 151         Warning(" EFLAGS = 0x%08x", Regs->eflags);
 152         Warning(" EAX %08x ECX %08x EDX %08x EBX %08x",
 153                 Regs->eax, Regs->ecx, Regs->edx, Regs->ebx);
 154         Warning(" ESP %08x EBP %08x ESI %08x EDI %08x",
 155                 Regs->esp, Regs->ebp, Regs->esi, Regs->edi);
 156         Warning(" DS %04x ES %04x FS %04x GS %04x",
 157                 Regs->ds, Regs->es, Regs->fs, Regs->gs);
 158
 159         // Control Registers
 160         __asm__ __volatile__ ("mov %%cr0, %0":"=r"(cr));
 161         Warning(" CR0 0x%08x", cr);
 162         __asm__ __volatile__ ("mov %%cr2, %0":"=r"(cr));
 163         Warning(" CR2 0x%08x", cr);
 164         __asm__ __volatile__ ("mov %%cr3, %0":"=r"(cr));
 165         Warning(" CR3 0x%08x", cr);
 166
 167         switch( Regs->int_num )
 168         {
 169         case 6: // #UD
 170                 Warning(" Offending bytes: %02x %02x %02x %02x",
 171                         *(Uint8*)Regs->eip+0, *(Uint8*)Regs->eip+1,
 172                         *(Uint8*)Regs->eip+2, *(Uint8*)Regs->eip+3);
 173                 break;
 174         }
 175
 176         // Print Stack Backtrace
 177         Error_Backtrace(Regs->eip, Regs->ebp);
 178
 179         // Dump running threads
 180         Threads_Dump();
 181
 182         for(;;) __asm__ __volatile__ ("hlt");
 183 }
 184
 185 void Proc_PrintBacktrace(void)
 186 {
 187         Uint32  ebp;
 188         __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (ebp));
 189         Error_Backtrace( *(Uint32*)(ebp+4), *(Uint32*)ebp );
 190 }
 191
 192 /**
 193  * \fn void Error_Backtrace(Uint eip, Uint ebp)
 194  * \brief Unrolls the stack to trace execution
 195  * \param eip   Current Instruction Pointer
 196  * \param ebp   Current Base Pointer (Stack Frame)
 197  */
 198 void Error_Backtrace(Uint eip, Uint ebp)
 199 {
 200          int    i = 0;
 201         Uint    delta = 0;
 202         char    *str = NULL;
 203
 204         //if(eip < 0xC0000000 && eip > 0x1000)
 205         //{
 206         //      LogF("Backtrace: User - 0x%x\n", eip);
 207         //      return;
 208         //}
 209
 210         if(eip > 0xE0000000)
 211         {
 212                 LogF("Backtrace: Data Area - 0x%x\n", eip);
 213                 return;
 214         }
 215
 216         if(eip > 0xC8000000)
 217         {
 218                 LogF("Backtrace: Kernel Module - 0x%x\n", eip);
 219                 return;
 220         }
 221
 222         //str = Debug_GetSymbol(eip, &delta);
 223         if(str == NULL)
 224                 LogF("Backtrace: 0x%x", eip);
 225         else
 226                 LogF("Backtrace: %s+0x%x", str, delta);
 227         if(!MM_GetPhysAddr(ebp))
 228         {
 229                 LogF("\nBacktrace: Invalid EBP, stopping\n");
 230                 return;
 231         }
 232
 233
 234         while( MM_GetPhysAddr(ebp) && i < MAX_BACKTRACE )
 235         {
 236                 //str = Debug_GetSymbol(*(Uint*)(ebp+4), &delta);
 237                 if(str == NULL)
 238                         LogF(" >> 0x%x", *(Uint*)(ebp+4));
 239                 else
 240                         LogF(" >> %s+0x%x", str, delta);
 241                 ebp = *(Uint*)ebp;
 242                 i++;
 243         }
 244         LogF("\n");
 245 }
 246
 247 /**
 248  * \fn void StartupPrint(char *Str)
 249  * \brief Str   String to print
 250  * \note WHY IS THIS HERE?!?!
 251  */
 252 void StartupPrint(char *Str)
 253 {
 254         Uint16  *buf = (void*)0xC00B8000;
 255          int    i = 0;
 256         static int      line = 0;
 257         while(*Str)
 258         {
 259                 buf[line*80 + i++] = *Str | 0x0700;
 260                 Str ++;
 261         }
 262
 263         // Clear the rest of the line
 264         while(i < 80)
 265                 buf[line*80 + i++] = 0x0720;
 266
 267         line ++;
 268         if(line == 25)
 269         {
 270                 line --;
 271                 memcpy(buf, &buf[80], 80*24*2);
 272                 memset(&buf[80*24], 0, 80*2);
 273         }
 274 }
 275
 276 // === EXPORTS ===
 277 EXPORT(__stack_chk_fail);