xref: /openbmc/u-boot/arch/arm/lib/interrupts.c (revision f77d4410)
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 <efi_loader.h>
23 #include <asm/proc-armv/ptrace.h>
24 #include <asm/u-boot-arm.h>
25 #include <efi_loader.h>
26 
27 DECLARE_GLOBAL_DATA_PTR;
28 
29 int interrupt_init (void)
30 {
31 	/*
32 	 * setup up stacks if necessary
33 	 */
34 	IRQ_STACK_START_IN = gd->irq_sp + 8;
35 
36 	return 0;
37 }
38 
39 void enable_interrupts (void)
40 {
41 	return;
42 }
43 int disable_interrupts (void)
44 {
45 	return 0;
46 }
47 
48 void bad_mode (void)
49 {
50 	panic ("Resetting CPU ...\n");
51 	reset_cpu (0);
52 }
53 
54 static void show_efi_loaded_images(struct pt_regs *regs)
55 {
56 	efi_print_image_infos((void *)instruction_pointer(regs));
57 }
58 
59 static void dump_instr(struct pt_regs *regs)
60 {
61 	unsigned long addr = instruction_pointer(regs);
62 	const int thumb = thumb_mode(regs);
63 	const int width = thumb ? 4 : 8;
64 	int i;
65 
66 	if (thumb)
67 		addr &= ~1L;
68 	else
69 		addr &= ~3L;
70 	printf("Code: ");
71 	for (i = -4; i < 1 + !!thumb; i++) {
72 		unsigned int val;
73 
74 		if (thumb)
75 			val = ((u16 *)addr)[i];
76 		else
77 			val = ((u32 *)addr)[i];
78 		printf(i == 0 ? "(%0*x) " : "%0*x ", width, val);
79 	}
80 	printf("\n");
81 }
82 
83 void show_regs (struct pt_regs *regs)
84 {
85 	unsigned long __maybe_unused flags;
86 	const char __maybe_unused *processor_modes[] = {
87 	"USER_26",	"FIQ_26",	"IRQ_26",	"SVC_26",
88 	"UK4_26",	"UK5_26",	"UK6_26",	"UK7_26",
89 	"UK8_26",	"UK9_26",	"UK10_26",	"UK11_26",
90 	"UK12_26",	"UK13_26",	"UK14_26",	"UK15_26",
91 	"USER_32",	"FIQ_32",	"IRQ_32",	"SVC_32",
92 	"UK4_32",	"UK5_32",	"UK6_32",	"ABT_32",
93 	"UK8_32",	"UK9_32",	"HYP_32",	"UND_32",
94 	"UK12_32",	"UK13_32",	"UK14_32",	"SYS_32",
95 	};
96 
97 	flags = condition_codes (regs);
98 
99 	printf("pc : [<%08lx>]	   lr : [<%08lx>]\n",
100 	       instruction_pointer(regs), regs->ARM_lr);
101 	if (gd->flags & GD_FLG_RELOC) {
102 		printf("reloc pc : [<%08lx>]	   lr : [<%08lx>]\n",
103 		       instruction_pointer(regs) - gd->reloc_off,
104 		       regs->ARM_lr - gd->reloc_off);
105 	}
106 	printf("sp : %08lx  ip : %08lx	 fp : %08lx\n",
107 	       regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
108 	printf ("r10: %08lx  r9 : %08lx	 r8 : %08lx\n",
109 		regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
110 	printf ("r7 : %08lx  r6 : %08lx	 r5 : %08lx  r4 : %08lx\n",
111 		regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
112 	printf ("r3 : %08lx  r2 : %08lx	 r1 : %08lx  r0 : %08lx\n",
113 		regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
114 	printf ("Flags: %c%c%c%c",
115 		flags & CC_N_BIT ? 'N' : 'n',
116 		flags & CC_Z_BIT ? 'Z' : 'z',
117 		flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
118 	printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
119 		interrupts_enabled (regs) ? "on" : "off",
120 		fast_interrupts_enabled (regs) ? "on" : "off",
121 		processor_modes[processor_mode (regs)],
122 		thumb_mode (regs) ? " (T)" : "");
123 	dump_instr(regs);
124 }
125 
126 /* fixup PC to point to the instruction leading to the exception */
127 static inline void fixup_pc(struct pt_regs *regs, int offset)
128 {
129 	uint32_t pc = instruction_pointer(regs) + offset;
130 	regs->ARM_pc = pc | (regs->ARM_pc & PCMASK);
131 }
132 
133 void do_undefined_instruction (struct pt_regs *pt_regs)
134 {
135 	efi_restore_gd();
136 	printf ("undefined instruction\n");
137 	fixup_pc(pt_regs, -4);
138 	show_regs (pt_regs);
139 	show_efi_loaded_images(pt_regs);
140 	bad_mode ();
141 }
142 
143 void do_software_interrupt (struct pt_regs *pt_regs)
144 {
145 	efi_restore_gd();
146 	printf ("software interrupt\n");
147 	fixup_pc(pt_regs, -4);
148 	show_regs (pt_regs);
149 	show_efi_loaded_images(pt_regs);
150 	bad_mode ();
151 }
152 
153 void do_prefetch_abort (struct pt_regs *pt_regs)
154 {
155 	efi_restore_gd();
156 	printf ("prefetch abort\n");
157 	fixup_pc(pt_regs, -8);
158 	show_regs (pt_regs);
159 	show_efi_loaded_images(pt_regs);
160 	bad_mode ();
161 }
162 
163 void do_data_abort (struct pt_regs *pt_regs)
164 {
165 	efi_restore_gd();
166 	printf ("data abort\n");
167 	fixup_pc(pt_regs, -8);
168 	show_regs (pt_regs);
169 	show_efi_loaded_images(pt_regs);
170 	bad_mode ();
171 }
172 
173 void do_not_used (struct pt_regs *pt_regs)
174 {
175 	efi_restore_gd();
176 	printf ("not used\n");
177 	fixup_pc(pt_regs, -8);
178 	show_regs (pt_regs);
179 	show_efi_loaded_images(pt_regs);
180 	bad_mode ();
181 }
182 
183 void do_fiq (struct pt_regs *pt_regs)
184 {
185 	efi_restore_gd();
186 	printf ("fast interrupt request\n");
187 	fixup_pc(pt_regs, -8);
188 	show_regs (pt_regs);
189 	show_efi_loaded_images(pt_regs);
190 	bad_mode ();
191 }
192 
193 void do_irq (struct pt_regs *pt_regs)
194 {
195 	efi_restore_gd();
196 	printf ("interrupt request\n");
197 	fixup_pc(pt_regs, -8);
198 	show_regs (pt_regs);
199 	show_efi_loaded_images(pt_regs);
200 	bad_mode ();
201 }
202