src/arch/arm/armv7/exception.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2
   3 #include <types.h>
   4 #include <arch/cache.h>
   5 #include <arch/exception.h>
   6 #include <console/console.h>
   7
   8 uint8_t exception_stack[0x100] __aligned(8);
   9 extern void *exception_stack_end;
  10
  11 void exception_undefined_instruction(uint32_t *regs);
  12 void exception_software_interrupt(uint32_t *regs);
  13 void exception_prefetch_abort(uint32_t *regs);
  14 void exception_data_abort(uint32_t *regs);
  15 void exception_not_used(uint32_t *regs);
  16 void exception_irq(uint32_t *regs);
  17 void exception_fiq(uint32_t *regs);
  18
  19 static void dump_stack(uintptr_t addr, size_t bytes)
  20 {
  21         int i, j;
  22         const int line = 8;
  23         uint32_t *ptr = (uint32_t *)(addr & ~(line * sizeof(*ptr) - 1));
  24
  25         printk(BIOS_ERR, "Dumping stack:\n");
  26         for (i = bytes / sizeof(*ptr); i >= 0; i -= line) {
  27                 printk(BIOS_ERR, "%p: ", ptr + i);
  28                 for (j = i; j < i + line; j++)
  29                         printk(BIOS_ERR, "%08x ", *(ptr + j));
  30                 printk(BIOS_ERR, "\n");
  31         }
  32 }
  33
  34 static void print_regs(uint32_t *regs)
  35 {
  36         int i;
  37
  38         for (i = 0; i < 16; i++) {
  39                 if (i == 15)
  40                         printk(BIOS_ERR, "PC");
  41                 else if (i == 14)
  42                         printk(BIOS_ERR, "LR");
  43                 else if (i == 13)
  44                         printk(BIOS_ERR, "SP");
  45                 else if (i == 12)
  46                         printk(BIOS_ERR, "IP");
  47                 else
  48                         printk(BIOS_ERR, "R%d", i);
  49                 printk(BIOS_ERR, " = 0x%08x\n", regs[i]);
  50         }
  51 }
  52
  53 void exception_undefined_instruction(uint32_t *regs)
  54 {
  55         printk(BIOS_ERR, "exception _undefined_instruction\n");
  56         regs[15] -= 2;  /* CAREFUL: specific to thumb mode (otherwise 4)! */
  57         print_regs(regs);
  58         dump_stack(regs[13], 512);
  59         die("exception");
  60 }
  61
  62 void exception_software_interrupt(uint32_t *regs)
  63 {
  64         printk(BIOS_ERR, "exception _software_interrupt\n");
  65         print_regs(regs);
  66         dump_stack(regs[13], 512);
  67         die("exception");
  68 }
  69
  70 void exception_prefetch_abort(uint32_t *regs)
  71 {
  72         printk(BIOS_ERR, "exception _prefetch_abort\n");
  73         regs[15] -= 4;
  74         print_regs(regs);
  75         printk(BIOS_ERR, "IFAR = %#.8x\n", read_ifar());
  76         printk(BIOS_ERR, "IFSR = %#.8x\n", read_ifsr());
  77         printk(BIOS_ERR, "AIFSR = %#.8x\n", read_aifsr());
  78         dump_stack(regs[13], 512);
  79         die("exception");
  80 }
  81
  82 void exception_data_abort(uint32_t *regs)
  83 {
  84         printk(BIOS_ERR, "exception _data_abort\n");
  85         regs[15] -= 8;
  86         print_regs(regs);
  87         printk(BIOS_ERR, "DFAR = %#.8x\n", read_dfar());
  88         printk(BIOS_ERR, "DFSR = %#.8x\n", read_dfsr());
  89         printk(BIOS_ERR, "ADFSR = %#.8x\n", read_adfsr());
  90         dump_stack(regs[13], 512);
  91         die("exception");
  92 }
  93
  94 void exception_not_used(uint32_t *regs)
  95 {
  96         printk(BIOS_ERR, "exception _not_used\n");
  97         print_regs(regs);
  98         dump_stack(regs[13], 512);
  99         die("exception");
 100 }
 101
 102 void exception_irq(uint32_t *regs)
 103 {
 104         printk(BIOS_ERR, "exception _irq\n");
 105         regs[15] -= 4;
 106         print_regs(regs);
 107         dump_stack(regs[13], 512);
 108         die("exception");
 109 }
 110
 111 void exception_fiq(uint32_t *regs)
 112 {
 113         printk(BIOS_ERR, "exception _fiq\n");
 114         regs[15] -= 4;
 115         print_regs(regs);
 116         dump_stack(regs[13], 512);
 117         die("exception");
 118 }
 119
 120 void exception_init(void)
 121 {
 122         uint32_t sctlr = read_sctlr();
 123         /* Handle exceptions in ARM mode. */
 124         sctlr &= ~SCTLR_TE;
 125         /* Set V=0 in SCTLR so VBAR points to the exception vector table. */
 126         sctlr &= ~SCTLR_V;
 127         /* Enforce alignment temporarily. */
 128         write_sctlr(sctlr);
 129
 130         extern uint32_t exception_table[];
 131         set_vbar((uintptr_t)exception_table);
 132         exception_stack_end = exception_stack + sizeof(exception_stack);
 133
 134         printk(BIOS_DEBUG, "Exception handlers installed.\n");
 135 }