summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/system-arm.c
blob: c8d12e296ab2f5de44d57ec2488ed6240fc41485 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2006 by Thom Johansen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "config.h"
#include "system.h"
#include <stdio.h>
#include "lcd.h"
#include "font.h"
#include "gcc_extensions.h"

#include <get_sp.h>
#include <backtrace.h>

static const char* const uiename[] = {
    "Undefined instruction",
    "Prefetch abort",
    "Data abort",
    "Divide by zero",
    "SWI"
};

void __attribute__((weak,naked)) data_abort_handler(void)
{
    asm volatile(
        "sub    r0, lr, #8  \n"
        "mov    r1, #2      \n"
        "b      UIE         \n"
        );
}

void __attribute__((weak,naked)) software_int_handler(void)
{
    asm volatile(
        "sub    r0, lr, #4  \n"
        "mov    r1, #4      \n"
        "b      UIE         \n"
        );
}

void __attribute__((weak,naked)) reserved_handler(void)
{
    asm volatile(
        "sub    r0, lr, #4  \n"
        "mov    r1, #4      \n"
        "b      UIE         \n"
        );
}

void __attribute__((weak,naked)) prefetch_abort_handler(void)
{
    asm volatile(
        "sub    r0, lr, #4  \n"
        "mov    r1, #1      \n"
        "b      UIE         \n"
        );
}

void __attribute__((weak,naked)) undef_instr_handler(void)
{
    asm volatile(
        "sub    r0, lr, #4    \n"
#ifdef USE_THUMB
        "mrs    r1, spsr      \n"
        "tst    r1, #(1 << 5) \n" // T bit set ?
        "subne  r0, lr, #2    \n" // if yes, offset to THUMB instruction
#endif
        "mov    r1, #0        \n"
        "b      UIE           \n"
        );
}

/* Unexpected Interrupt or Exception handler. Currently only deals with
   exceptions, but will deal with interrupts later.
 */
void NORETURN_ATTR UIE(unsigned int pc, unsigned int num)
{
    /* safe guard variable - we call backtrace() only on first
     * UIE call. This prevent endless loop if backtrace() touches
     * memory regions which cause abort
     */
    static bool triggered = false;

#if LCD_DEPTH > 1
    lcd_set_backdrop(NULL);
    lcd_set_drawmode(DRMODE_SOLID);
    lcd_set_foreground(LCD_BLACK);
    lcd_set_background(LCD_WHITE);
#endif
    unsigned line = 0;

    lcd_setfont(FONT_SYSFIXED);
    lcd_set_viewport(NULL);
    lcd_clear_display();
    lcd_putsf(0, line++, "%s at %08x" IF_COP(" (%d)"), uiename[num], pc IF_COP(, CURRENT_CORE));

#if !defined(CPU_ARM7TDMI) && (CONFIG_CPU != RK27XX) /* arm7tdmi has no MPU/MMU */
    if(num == 1 || num == 2) /* prefetch / data abort */
    {
        register unsigned status;

#if ARM_ARCH >= 6
        /* ARMv6 has 2 different registers for prefetch & data aborts */
        if(num == 1)    /* instruction prefetch abort */
            asm volatile( "mrc p15, 0, %0, c5, c0, 1\n" : "=r"(status));
        else
#endif
            asm volatile( "mrc p15, 0, %0, c5, c0, 0\n" : "=r"(status));

        lcd_putsf(0, line++, "FSR 0x%x", status);

        unsigned int domain = (status >> 4) & 0xf;
        unsigned int fault = status & 0xf;
#if ARM_ARCH >= 6
        fault |= (status & (1<<10)) >> 6; /* fault is 5 bits on armv6 */
#endif
        lcd_putsf(0, line++, "(domain %d, fault %d)", domain, fault);

        if(num == 2) /* data abort */
        {
            register unsigned address;
            /* read FAR (fault address register) */
            asm volatile( "mrc p15, 0, %0, c6, c0\n" : "=r"(address));
            lcd_putsf(0, line++, "address 0x%8x", address);
#if ARM_ARCH >= 6
            lcd_putsf(0, line++, (status & (1<<11)) ? "(write)" : "(read)");
#endif
        }
    }   /* num == 1 || num == 2 // prefetch/data abort */
#endif /* !defined(CPU_ARM7TDMI */

    if (!triggered)
    {
        triggered = true;
        //backtrace(pc, __get_sp(), &line);
    }

    lcd_update();

    disable_interrupt(IRQ_FIQ_STATUS);

    system_exception_wait(); /* If this returns, try to reboot */
    system_reboot();
    while (1);       /* halt */
}

/* Needs to be here or gcc won't find it */
void __attribute__((naked)) __div0(void)
{
    asm volatile (
        "ldr    r0, [sp]    \r\n"
        "sub    r0, r0, #4  \r\n"
        "mov    r1, #3      \r\n"
        "b      UIE         \r\n"
    );
}