1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * (C) Copyright 2003 4 * Texas Instruments <www.ti.com> 5 * 6 * (C) Copyright 2002 7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8 * Marius Groeger <mgroeger@sysgo.de> 9 * 10 * (C) Copyright 2002 11 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 12 * Alex Zuepke <azu@sysgo.de> 13 * 14 * (C) Copyright 2002-2004 15 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> 16 * 17 * (C) Copyright 2004 18 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com> 19 */ 20 21#include <common.h> 22#include <cpu_func.h> 23#include <efi_loader.h> 24#include <irq_func.h> 25#include <semihosting.h> 26#include <asm/global_data.h> 27#include <asm/proc-armv/ptrace.h> 28#include <asm/ptrace.h> 29#include <asm/u-boot-arm.h> 30 31DECLARE_GLOBAL_DATA_PTR; 32 33int interrupt_init(void) 34{ 35 /* 36 * setup up stacks if necessary 37 */ 38 IRQ_STACK_START_IN = gd->irq_sp + 8; 39 40 enable_interrupts(); 41 42 return 0; 43} 44 45void enable_interrupts(void) 46{ 47 return; 48} 49int disable_interrupts(void) 50{ 51 return 0; 52} 53 54void bad_mode (void) 55{ 56 panic ("Resetting CPU ...\n"); 57 reset_cpu(); 58} 59 60static void show_efi_loaded_images(struct pt_regs *regs) 61{ 62 efi_print_image_infos((void *)instruction_pointer(regs)); 63} 64 65static void dump_instr(struct pt_regs *regs) 66{ 67 unsigned long addr = instruction_pointer(regs); 68 const int thumb = thumb_mode(regs); 69 const int width = thumb ? 4 : 8; 70 int i; 71 72 if (thumb) 73 addr &= ~1L; 74 else 75 addr &= ~3L; 76 printf("Code: "); 77 for (i = -4; i < 1 + !!thumb; i++) { 78 unsigned int val; 79 80 if (thumb) 81 val = ((u16 *)addr)[i]; 82 else 83 val = ((u32 *)addr)[i]; 84 printf(i == 0 ? "(%0*x) " : "%0*x ", width, val); 85 } 86 printf("\n"); 87} 88 89void show_regs (struct pt_regs *regs) 90{ 91 unsigned long __maybe_unused flags; 92 const char __maybe_unused *processor_modes[] = { 93 "USER_26", "FIQ_26", "IRQ_26", "SVC_26", 94 "UK4_26", "UK5_26", "UK6_26", "UK7_26", 95 "UK8_26", "UK9_26", "UK10_26", "UK11_26", 96 "UK12_26", "UK13_26", "UK14_26", "UK15_26", 97 "USER_32", "FIQ_32", "IRQ_32", "SVC_32", 98 "UK4_32", "UK5_32", "UK6_32", "ABT_32", 99 "UK8_32", "UK9_32", "HYP_32", "UND_32", 100 "UK12_32", "UK13_32", "UK14_32", "SYS_32", 101 }; 102 103 flags = condition_codes (regs); 104 105 printf("pc : [<%08lx>] lr : [<%08lx>]\n", 106 instruction_pointer(regs), regs->ARM_lr); 107 if (gd->flags & GD_FLG_RELOC) { 108 printf("reloc pc : [<%08lx>] lr : [<%08lx>]\n", 109 instruction_pointer(regs) - gd->reloc_off, 110 regs->ARM_lr - gd->reloc_off); 111 } 112 printf("sp : %08lx ip : %08lx fp : %08lx\n", 113 regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); 114 printf ("r10: %08lx r9 : %08lx r8 : %08lx\n", 115 regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); 116 printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", 117 regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); 118 printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", 119 regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); 120 printf ("Flags: %c%c%c%c", 121 flags & CC_N_BIT ? 'N' : 'n', 122 flags & CC_Z_BIT ? 'Z' : 'z', 123 flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v'); 124 printf (" IRQs %s FIQs %s Mode %s%s\n", 125 interrupts_enabled (regs) ? "on" : "off", 126 fast_interrupts_enabled (regs) ? "on" : "off", 127 processor_modes[processor_mode (regs)], 128 thumb_mode (regs) ? " (T)" : ""); 129 dump_instr(regs); 130} 131 132/* fixup PC to point to the instruction leading to the exception */ 133static inline void fixup_pc(struct pt_regs *regs, int offset) 134{ 135 uint32_t pc = instruction_pointer(regs) + offset; 136 regs->ARM_pc = pc | (regs->ARM_pc & PCMASK); 137} 138 139/* 140 * Try to "emulate" a semihosting call in the event that we don't have a 141 * debugger attached. 142 */ 143static bool smh_emulate_trap(struct pt_regs *regs) 144{ 145 if (regs->ARM_cpsr & T_BIT) { 146 u16 *insn = (u16 *)(regs->ARM_pc - 2); 147 148 if (*insn != SMH_T32_SVC) 149 return false; 150 } else { 151 u32 *insn = (u32 *)(regs->ARM_pc - 4); 152 153 if (*insn != SMH_A32_SVC) 154 return false; 155 } 156 157 /* Avoid future semihosting calls */ 158 disable_semihosting(); 159 160 /* Just pretend the call failed */ 161 regs->ARM_r0 = -1; 162 return true; 163} 164 165void do_undefined_instruction (struct pt_regs *pt_regs) 166{ 167 efi_restore_gd(); 168 printf ("undefined instruction\n"); 169 fixup_pc(pt_regs, -4); 170 show_regs (pt_regs); 171 show_efi_loaded_images(pt_regs); 172 bad_mode (); 173} 174 175void do_software_interrupt (struct pt_regs *pt_regs) 176{ 177 if (CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK) && 178 smh_emulate_trap(pt_regs)) 179 return; 180 181 efi_restore_gd(); 182 printf ("software interrupt\n"); 183 fixup_pc(pt_regs, -4); 184 show_regs (pt_regs); 185 show_efi_loaded_images(pt_regs); 186 bad_mode (); 187} 188 189void do_prefetch_abort (struct pt_regs *pt_regs) 190{ 191 efi_restore_gd(); 192 printf ("prefetch abort\n"); 193 fixup_pc(pt_regs, -8); 194 show_regs (pt_regs); 195 show_efi_loaded_images(pt_regs); 196 bad_mode (); 197} 198 199void do_data_abort (struct pt_regs *pt_regs) 200{ 201 efi_restore_gd(); 202 printf ("data abort\n"); 203 fixup_pc(pt_regs, -8); 204 show_regs (pt_regs); 205 show_efi_loaded_images(pt_regs); 206 bad_mode (); 207} 208 209void do_not_used (struct pt_regs *pt_regs) 210{ 211 efi_restore_gd(); 212 printf ("not used\n"); 213 fixup_pc(pt_regs, -8); 214 show_regs (pt_regs); 215 show_efi_loaded_images(pt_regs); 216 bad_mode (); 217} 218 219void do_fiq (struct pt_regs *pt_regs) 220{ 221 efi_restore_gd(); 222 printf ("fast interrupt request\n"); 223 fixup_pc(pt_regs, -8); 224 show_regs (pt_regs); 225 show_efi_loaded_images(pt_regs); 226 bad_mode (); 227} 228 229void do_irq (struct pt_regs *pt_regs) 230{ 231 efi_restore_gd(); 232 printf ("interrupt request\n"); 233 fixup_pc(pt_regs, -8); 234 show_regs (pt_regs); 235 show_efi_loaded_images(pt_regs); 236 bad_mode (); 237} 238