arch/arm/lib/interrupts_m.c

   1 /*
   2  * (C) Copyright 2015
   3  * Kamil Lulko, <kamil.lulko@gmail.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9
  10 /*
  11  * Upon exception entry ARMv7-M processors automatically save stack
  12  * frames containing some registers. For simplicity initial
  13  * implementation uses only this auto-saved stack frame.
  14  * This does not contain complete register set dump,
  15  * only R0-R3, R12, LR, PC and xPSR are saved.
  16  */
  17
  18 struct autosave_regs {
  19         long uregs[8];
  20 };
  21
  22 #define ARM_XPSR        uregs[7]
  23 #define ARM_PC          uregs[6]
  24 #define ARM_LR          uregs[5]
  25 #define ARM_R12         uregs[4]
  26 #define ARM_R3          uregs[3]
  27 #define ARM_R2          uregs[2]
  28 #define ARM_R1          uregs[1]
  29 #define ARM_R0          uregs[0]
  30
  31 int interrupt_init(void)
  32 {
  33         return 0;
  34 }
  35
  36 void enable_interrupts(void)
  37 {
  38         return;
  39 }
  40
  41 int disable_interrupts(void)
  42 {
  43         return 0;
  44 }
  45
  46 void dump_regs(struct autosave_regs *regs)
  47 {
  48         printf("pc : %08lx    lr : %08lx    xPSR : %08lx\n",
  49                regs->ARM_PC, regs->ARM_LR, regs->ARM_XPSR);
  50         printf("r12 : %08lx   r3 : %08lx    r2 : %08lx\n"
  51                 "r1 : %08lx    r0 : %08lx\n",
  52                 regs->ARM_R12, regs->ARM_R3, regs->ARM_R2,
  53                 regs->ARM_R1, regs->ARM_R0);
  54 }
  55
  56 void bad_mode(void)
  57 {
  58         panic("Resetting CPU ...\n");
  59         reset_cpu(0);
  60 }
  61
  62 void do_hard_fault(struct autosave_regs *autosave_regs)
  63 {
  64         printf("Hard fault\n");
  65         dump_regs(autosave_regs);
  66         bad_mode();
  67 }
  68
  69 void do_mm_fault(struct autosave_regs *autosave_regs)
  70 {
  71         printf("Memory management fault\n");
  72         dump_regs(autosave_regs);
  73         bad_mode();
  74 }
  75
  76 void do_bus_fault(struct autosave_regs *autosave_regs)
  77 {
  78         printf("Bus fault\n");
  79         dump_regs(autosave_regs);
  80         bad_mode();
  81 }
  82
  83 void do_usage_fault(struct autosave_regs *autosave_regs)
  84 {
  85         printf("Usage fault\n");
  86         dump_regs(autosave_regs);
  87         bad_mode();
  88 }
  89
  90 void do_invalid_entry(struct autosave_regs *autosave_regs)
  91 {
  92         printf("Exception\n");
  93         dump_regs(autosave_regs);
  94         bad_mode();
  95 }