1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2000 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 * 6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 7 */ 8 9 /* 10 * This file handles the architecture-dependent parts of hardware 11 * exceptions 12 */ 13 14 #include <common.h> 15 #include <command.h> 16 #include <kgdb.h> 17 #include <asm/processor.h> 18 #include <asm/mpc8349_pci.h> 19 20 DECLARE_GLOBAL_DATA_PTR; 21 22 /* Returns 0 if exception not found and fixup otherwise. */ 23 extern unsigned long search_exception_table(unsigned long); 24 25 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize) 26 27 /* 28 * Trap & Exception support 29 */ 30 31 static void print_backtrace(unsigned long *sp) 32 { 33 int cnt = 0; 34 unsigned long i; 35 36 puts ("Call backtrace: "); 37 while (sp) { 38 if ((uint)sp > END_OF_MEM) 39 break; 40 41 i = sp[1]; 42 if (cnt++ % 7 == 0) 43 putc ('\n'); 44 printf("%08lX ", i); 45 if (cnt > 32) break; 46 sp = (unsigned long *)*sp; 47 } 48 putc ('\n'); 49 } 50 51 void show_regs(struct pt_regs *regs) 52 { 53 int i; 54 55 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n", 56 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); 57 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n", 58 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0, 59 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0, 60 regs->msr&MSR_IR ? 1 : 0, 61 regs->msr&MSR_DR ? 1 : 0); 62 63 putc ('\n'); 64 for (i = 0; i < 32; i++) { 65 if ((i % 8) == 0) { 66 printf("GPR%02d: ", i); 67 } 68 69 printf("%08lX ", regs->gpr[i]); 70 if ((i % 8) == 7) { 71 putc ('\n'); 72 } 73 } 74 } 75 76 77 static void _exception(int signr, struct pt_regs *regs) 78 { 79 show_regs(regs); 80 print_backtrace((unsigned long *)regs->gpr[1]); 81 panic("Exception in kernel pc %lx signal %d",regs->nip,signr); 82 } 83 84 #ifdef CONFIG_PCI 85 void dump_pci (void) 86 { 87 /* 88 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 89 printf ("PCI: err status %x err mask %x err ctrl %x\n", 90 le32_to_cpu (immap->im_pci.pci_esr), 91 le32_to_cpu (immap->im_pci.pci_emr), 92 le32_to_cpu (immap->im_pci.pci_ecr)); 93 printf (" error address %x error data %x ctrl %x\n", 94 le32_to_cpu (immap->im_pci.pci_eacr), 95 le32_to_cpu (immap->im_pci.pci_edcr), 96 le32_to_cpu (immap->im_pci.pci_eccr)); 97 */ 98 } 99 #endif 100 101 void MachineCheckException(struct pt_regs *regs) 102 { 103 unsigned long fixup; 104 105 /* Probing PCI using config cycles cause this exception 106 * when a device is not present. Catch it and return to 107 * the PCI exception handler. 108 */ 109 #ifdef CONFIG_PCI 110 #if 0 111 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; 112 #ifdef DEBUG 113 dump_pci(); 114 #endif 115 /* clear the error in the error status register */ 116 if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) { 117 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP); 118 return; 119 } 120 #endif 121 #endif /* CONFIG_PCI */ 122 if ((fixup = search_exception_table(regs->nip)) != 0) { 123 regs->nip = fixup; 124 return; 125 } 126 127 #if defined(CONFIG_CMD_KGDB) 128 if (debugger_exception_handler && (*debugger_exception_handler)(regs)) 129 return; 130 #endif 131 132 puts ("Machine check in kernel mode.\n" 133 "Caused by (from msr): "); 134 printf("regs %p ",regs); 135 switch( regs->msr & 0x000F0000) { 136 case (0x80000000>>12): 137 puts ("Machine check signal - probably due to mm fault\n" 138 "with mmu off\n"); 139 break; 140 case (0x80000000>>13): 141 puts ("Transfer error ack signal\n"); 142 break; 143 case (0x80000000>>14): 144 puts ("Data parity signal\n"); 145 break; 146 case (0x80000000>>15): 147 puts ("Address parity signal\n"); 148 break; 149 default: 150 puts ("Unknown values in msr\n"); 151 } 152 show_regs(regs); 153 print_backtrace((unsigned long *)regs->gpr[1]); 154 #ifdef CONFIG_PCI 155 dump_pci(); 156 #endif 157 panic("machine check"); 158 } 159 160 void AlignmentException(struct pt_regs *regs) 161 { 162 #if defined(CONFIG_CMD_KGDB) 163 if (debugger_exception_handler && (*debugger_exception_handler)(regs)) 164 return; 165 #endif 166 show_regs(regs); 167 print_backtrace((unsigned long *)regs->gpr[1]); 168 panic("Alignment Exception"); 169 } 170 171 void ProgramCheckException(struct pt_regs *regs) 172 { 173 #if defined(CONFIG_CMD_KGDB) 174 if (debugger_exception_handler && (*debugger_exception_handler)(regs)) 175 return; 176 #endif 177 show_regs(regs); 178 print_backtrace((unsigned long *)regs->gpr[1]); 179 panic("Program Check Exception"); 180 } 181 182 void SoftEmuException(struct pt_regs *regs) 183 { 184 #if defined(CONFIG_CMD_KGDB) 185 if (debugger_exception_handler && (*debugger_exception_handler)(regs)) 186 return; 187 #endif 188 show_regs(regs); 189 print_backtrace((unsigned long *)regs->gpr[1]); 190 panic("Software Emulation Exception"); 191 } 192 193 194 void UnknownException(struct pt_regs *regs) 195 { 196 #if defined(CONFIG_CMD_KGDB) 197 if (debugger_exception_handler && (*debugger_exception_handler)(regs)) 198 return; 199 #endif 200 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", 201 regs->nip, regs->msr, regs->trap); 202 _exception(0, regs); 203 } 204 205 #if defined(CONFIG_CMD_BEDBUG) 206 extern void do_bedbug_breakpoint(struct pt_regs *); 207 #endif 208 209 void DebugException(struct pt_regs *regs) 210 { 211 printf("Debugger trap at @ %lx\n", regs->nip ); 212 show_regs(regs); 213 #if defined(CONFIG_CMD_BEDBUG) 214 do_bedbug_breakpoint( regs ); 215 #endif 216 } 217