Subversion Repositories HelenOS

Rev

Rev 4665 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2235 stepan 1
/*
2179 stepan 2
 * Copyright (c) 2007 Petr Stepan
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/** @addtogroup arm32
30
 * @{
31
 */
32
/** @file
2410 stepan 33
 *  @brief Exception handlers and exception initialization routines.
2179 stepan 34
 */
35
 
36
#include <arch/exception.h>
37
#include <arch/memstr.h>
2235 stepan 38
#include <arch/regutils.h>
39
#include <interrupt.h>
2282 jancik 40
#include <arch/mm/page_fault.h>
3135 jermar 41
#include <arch/barrier.h>
4651 pillai 42
#include <arch/machine.h>
2284 stepan 43
#include <print.h>
2286 stepan 44
#include <syscall/syscall.h>
2179 stepan 45
 
2407 stepan 46
/** Offset used in calculation of exception handler's relative address.
47
 *
48
 * @see install_handler()
49
 */
50
#define PREFETCH_OFFSET      0x8
2329 kebrt 51
 
2407 stepan 52
/** LDR instruction's code */
2306 kebrt 53
#define LDR_OPCODE           0xe59ff000
2179 stepan 54
 
2407 stepan 55
/** Number of exception vectors. */
56
#define EXC_VECTORS          8
2329 kebrt 57
 
2407 stepan 58
/** Size of memory block occupied by exception vectors. */
59
#define EXC_VECTORS_SIZE     (EXC_VECTORS * 4)
60
 
2235 stepan 61
/** Updates specified exception vector to jump to given handler.
2355 stepan 62
 *
2329 kebrt 63
 *  Addresses of handlers are stored in memory following exception vectors.
2235 stepan 64
 */
3135 jermar 65
static void install_handler(unsigned handler_addr, unsigned *vector)
2235 stepan 66
{
67
    /* relative address (related to exc. vector) of the word
68
     * where handler's address is stored
69
    */
2611 jermar 70
    volatile uint32_t handler_address_ptr = EXC_VECTORS_SIZE -
71
        PREFETCH_OFFSET;
2179 stepan 72
 
2235 stepan 73
    /* make it LDR instruction and store at exception vector */
74
    *vector = handler_address_ptr | LDR_OPCODE;
3135 jermar 75
    smc_coherence(*vector);
2179 stepan 76
 
2235 stepan 77
    /* store handler's address */
78
    *(vector + EXC_VECTORS) = handler_addr;
2284 stepan 79
 
2179 stepan 80
}
81
 
2286 stepan 82
/** Software Interrupt handler.
83
 *
84
 * Dispatches the syscall.
85
 */
2304 kebrt 86
static void swi_exception(int exc_no, istate_t *istate)
2284 stepan 87
{
2464 jermar 88
    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
2611 jermar 89
        istate->r3, istate->r4, istate->r5, istate->r6);
2284 stepan 90
}
91
 
2329 kebrt 92
/** Fills exception vectors with appropriate exception handlers. */
2235 stepan 93
void install_exception_handlers(void)
94
{
2464 jermar 95
    install_handler((unsigned) reset_exception_entry,
96
        (unsigned *) EXC_RESET_VEC);
2235 stepan 97
 
2464 jermar 98
    install_handler((unsigned) undef_instr_exception_entry,
99
        (unsigned *) EXC_UNDEF_INSTR_VEC);
2235 stepan 100
 
2464 jermar 101
    install_handler((unsigned) swi_exception_entry,
102
        (unsigned *) EXC_SWI_VEC);
2235 stepan 103
 
2464 jermar 104
    install_handler((unsigned) prefetch_abort_exception_entry,
105
        (unsigned *) EXC_PREFETCH_ABORT_VEC);
2235 stepan 106
 
2464 jermar 107
    install_handler((unsigned) data_abort_exception_entry,
108
        (unsigned *) EXC_DATA_ABORT_VEC);
2235 stepan 109
 
2464 jermar 110
    install_handler((unsigned) irq_exception_entry,
111
        (unsigned *) EXC_IRQ_VEC);
2235 stepan 112
 
4117 decky 113
    install_handler((unsigned) fiq_exception_entry,
2464 jermar 114
        (unsigned *) EXC_FIQ_VEC);
2179 stepan 115
}
116
 
2284 stepan 117
#ifdef HIGH_EXCEPTION_VECTORS
2329 kebrt 118
/** Activates use of high exception vectors addresses. */
2464 jermar 119
static void high_vectors(void)
2262 stepan 120
{
121
    uint32_t control_reg;
122
 
4018 decky 123
    asm volatile (
124
        "mrc p15, 0, %[control_reg], c1, c1"
125
        : [control_reg] "=r" (control_reg)
126
    );
2262 stepan 127
 
2464 jermar 128
    /* switch on the high vectors bit */
2262 stepan 129
    control_reg |= CP15_R1_HIGH_VECTORS_BIT;
130
 
4018 decky 131
    asm volatile (
132
        "mcr p15, 0, %[control_reg], c1, c1"
133
        :: [control_reg] "r" (control_reg)
134
    );
2262 stepan 135
}
2284 stepan 136
#endif
2262 stepan 137
 
4651 pillai 138
/** Interrupt Exception handler.
139
 *
140
 * Determines the sources of interrupt and calls their handlers.
141
 */
142
static void irq_exception(int exc_no, istate_t *istate)
143
{
144
    machine_irq_exception(exc_no, istate);
145
}
146
 
2245 stepan 147
/** Initializes exception handling.
4018 decky 148
 *
2245 stepan 149
 * Installs low-level exception handlers and then registers
150
 * exceptions and their handlers to kernel exception dispatcher.
151
 */
2235 stepan 152
void exception_init(void)
153
{
2262 stepan 154
#ifdef HIGH_EXCEPTION_VECTORS
155
    high_vectors();
156
#endif
2245 stepan 157
    install_exception_handlers();
158
 
2235 stepan 159
    exc_register(EXC_IRQ, "interrupt", (iroutine) irq_exception);
2464 jermar 160
    exc_register(EXC_PREFETCH_ABORT, "prefetch abort",
161
        (iroutine) prefetch_abort);
2277 jancik 162
    exc_register(EXC_DATA_ABORT, "data abort", (iroutine) data_abort);
2284 stepan 163
    exc_register(EXC_SWI, "software interrupt", (iroutine) swi_exception);
2179 stepan 164
}
165
 
2326 kebrt 166
/** Prints #istate_t structure content.
167
 *
168
 * @param istate Structure to be printed.
169
 */
2304 kebrt 170
void print_istate(istate_t *istate)
171
{
4117 decky 172
    printf("istate dump:\n");
173
 
174
    printf(" r0: %x    r1: %x    r2: %x    r3: %x\n",
2464 jermar 175
        istate->r0, istate->r1, istate->r2, istate->r3);
4117 decky 176
    printf(" r4: %x    r5: %x    r6: %x    r7: %x\n",
2464 jermar 177
        istate->r4, istate->r5, istate->r6, istate->r7);
4117 decky 178
    printf(" r8: %x    r8: %x   r10: %x   r11: %x\n",
2464 jermar 179
        istate->r8, istate->r9, istate->r10, istate->r11);
4117 decky 180
    printf(" r12: %x    sp: %x    lr: %x  spsr: %x\n",
2464 jermar 181
        istate->r12, istate->sp, istate->lr, istate->spsr);
4117 decky 182
 
183
    printf(" pc: %x\n", istate->pc);
2304 kebrt 184
}
185
 
2179 stepan 186
/** @}
187
 */