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Line 37... Line 37...
37
#include <arch/memstr.h>
37
#include <arch/memstr.h>
38
#include <arch/regutils.h>
38
#include <arch/regutils.h>
39
#include <interrupt.h>
39
#include <interrupt.h>
40
#include <arch/mm/page_fault.h>
40
#include <arch/mm/page_fault.h>
41
#include <arch/barrier.h>
41
#include <arch/barrier.h>
42
#include <arch/drivers/gxemul.h>
-
 
43
#include <print.h>
42
#include <print.h>
44
#include <syscall/syscall.h>
43
#include <syscall/syscall.h>
45
 
44
 
-
 
45
#ifdef MACHINE_testarm
-
 
46
    #include <arch/mach/testarm/testarm.h>
-
 
47
#endif
-
 
48
 
-
 
49
#ifdef MACHINE_integratorcp
-
 
50
    #include <arch/mach/integratorcp/integratorcp.h>
-
 
51
#endif
-
 
52
 
46
/** Offset used in calculation of exception handler's relative address.
53
/** Offset used in calculation of exception handler's relative address.
47
 *
54
 *
48
 * @see install_handler()
55
 * @see install_handler()
49
 */
56
 */
50
#define PREFETCH_OFFSET      0x8
57
#define PREFETCH_OFFSET      0x8
Line 56... Line 63...
56
#define EXC_VECTORS          8
63
#define EXC_VECTORS          8
57
 
64
 
58
/** Size of memory block occupied by exception vectors. */
65
/** Size of memory block occupied by exception vectors. */
59
#define EXC_VECTORS_SIZE     (EXC_VECTORS * 4)
66
#define EXC_VECTORS_SIZE     (EXC_VECTORS * 4)
60
 
67
 
61
/** Switches to kernel stack and saves all registers there.
-
 
62
 *
-
 
63
 * Temporary exception stack is used to save a few registers
-
 
64
 * before stack switch takes place.
-
 
65
 *
-
 
66
 */
-
 
67
inline static void setup_stack_and_save_regs()
-
 
68
{
-
 
69
    asm volatile (
-
 
70
        "ldr r13, =exc_stack\n"
-
 
71
        "stmfd r13!, {r0}\n"
-
 
72
        "mrs r0, spsr\n"
-
 
73
        "and r0, r0, #0x1f\n"
-
 
74
        "cmp r0, #0x10\n"
-
 
75
        "bne 1f\n"
-
 
76
       
-
 
77
        /* prev mode was usermode */
-
 
78
        "ldmfd r13!, {r0}\n"
-
 
79
        "ldr r13, =supervisor_sp\n"
-
 
80
        "ldr r13, [r13]\n"
-
 
81
        "stmfd r13!, {lr}\n"
-
 
82
        "stmfd r13!, {r0-r12}\n"
-
 
83
        "stmfd r13!, {r13, lr}^\n"
-
 
84
        "mrs r0, spsr\n"
-
 
85
        "stmfd r13!, {r0}\n"
-
 
86
        "b 2f\n"
-
 
87
       
-
 
88
        /* mode was not usermode */
-
 
89
        "1:\n"
-
 
90
            "stmfd r13!, {r1, r2, r3}\n"
-
 
91
            "mrs r1, cpsr\n"
-
 
92
            "mov r2, lr\n"
-
 
93
            "bic r1, r1, #0x1f\n"
-
 
94
            "orr r1, r1, r0\n"
-
 
95
            "mrs r0, cpsr\n"
-
 
96
            "msr cpsr_c, r1\n"
-
 
97
           
-
 
98
            "mov r3, r13\n"
-
 
99
            "stmfd r13!, {r2}\n"
-
 
100
            "mov r2, lr\n"
-
 
101
            "stmfd r13!, {r4-r12}\n"
-
 
102
            "mov r1, r13\n"
-
 
103
           
-
 
104
            /* the following two lines are for debugging */
-
 
105
            "mov sp, #0\n"
-
 
106
            "mov lr, #0\n"
-
 
107
            "msr cpsr_c, r0\n"
-
 
108
           
-
 
109
            "ldmfd r13!, {r4, r5, r6, r7}\n"
-
 
110
            "stmfd r1!, {r4, r5, r6}\n"
-
 
111
            "stmfd r1!, {r7}\n"
-
 
112
            "stmfd r1!, {r2}\n"
-
 
113
            "stmfd r1!, {r3}\n"
-
 
114
            "mrs r0, spsr\n"
-
 
115
            "stmfd r1!, {r0}\n"
-
 
116
            "mov r13, r1\n"
-
 
117
           
-
 
118
        "2:\n"
-
 
119
    );
-
 
120
}
-
 
121
 
-
 
122
/** Returns from exception mode.
-
 
123
 *
-
 
124
 * Previously saved state of registers (including control register)
-
 
125
 * is restored from the stack.
-
 
126
 */
-
 
127
inline static void load_regs()
-
 
128
{
-
 
129
    asm volatile(
-
 
130
        "ldmfd r13!, {r0}       \n"
-
 
131
        "msr spsr, r0           \n"
-
 
132
        "and r0, r0, #0x1f      \n"
-
 
133
        "cmp r0, #0x10          \n"
-
 
134
        "bne 1f             \n"
-
 
135
 
-
 
136
        /* return to user mode */
-
 
137
        "ldmfd r13!, {r13, lr}^     \n"
-
 
138
        "b 2f               \n"
-
 
139
 
-
 
140
        /* return to non-user mode */
-
 
141
    "1:\n"
-
 
142
        "ldmfd r13!, {r1, r2}       \n"
-
 
143
        "mrs r3, cpsr           \n"
-
 
144
        "bic r3, r3, #0x1f      \n"
-
 
145
        "orr r3, r3, r0         \n"
-
 
146
        "mrs r0, cpsr           \n"
-
 
147
        "msr cpsr_c, r3         \n"
-
 
148
 
-
 
149
        "mov r13, r1            \n"
-
 
150
        "mov lr, r2         \n"
-
 
151
        "msr cpsr_c, r0         \n"
-
 
152
 
-
 
153
        /* actual return */
-
 
154
    "2:\n"
-
 
155
        "ldmfd r13, {r0-r12, pc}^\n"
-
 
156
    );
-
 
157
}
-
 
158
 
-
 
159
 
-
 
160
/** Switch CPU to mode in which interrupts are serviced (currently it
-
 
161
 * is Undefined mode).
-
 
162
 *
-
 
163
 * The default mode for interrupt servicing (Interrupt Mode)
-
 
164
 * can not be used because of nested interrupts (which can occur
-
 
165
 * because interrupts are enabled in higher levels of interrupt handler).
-
 
166
 */
-
 
167
inline static void switch_to_irq_servicing_mode()
-
 
168
{
-
 
169
    /* switch to Undefined mode */
-
 
170
    asm volatile(
-
 
171
        /* save regs used during switching */
-
 
172
        "stmfd sp!, {r0-r3}     \n"
-
 
173
 
-
 
174
        /* save stack pointer and link register to r1, r2 */
-
 
175
        "mov r1, sp         \n"
-
 
176
        "mov r2, lr         \n"
-
 
177
 
-
 
178
        /* mode switch */
-
 
179
        "mrs r0, cpsr           \n"
-
 
180
        "bic r0, r0, #0x1f      \n"
-
 
181
        "orr r0, r0, #0x1b      \n"
-
 
182
        "msr cpsr_c, r0         \n"
-
 
183
 
-
 
184
        /* restore saved sp and lr */
-
 
185
        "mov sp, r1         \n"
-
 
186
        "mov lr, r2         \n"
-
 
187
 
-
 
188
        /* restore original regs */
-
 
189
        "ldmfd sp!, {r0-r3}     \n"
-
 
190
    );
-
 
191
}
-
 
192
 
-
 
193
/** Calls exception dispatch routine. */
-
 
194
#define CALL_EXC_DISPATCH(exception) \
-
 
195
    asm volatile ( \
-
 
196
        "mov r0, %[exc]\n" \
-
 
197
        "mov r1, r13\n" \
-
 
198
        "bl exc_dispatch\n" \
-
 
199
        :: [exc] "i" (exception) \
-
 
200
    );\
-
 
201
 
-
 
202
/** General exception handler.
-
 
203
 *
-
 
204
 *  Stores registers, dispatches the exception,
-
 
205
 *  and finally restores registers and returns from exception processing.
-
 
206
 *
-
 
207
 *  @param exception Exception number.
-
 
208
 */
-
 
209
#define PROCESS_EXCEPTION(exception) \
-
 
210
    setup_stack_and_save_regs(); \
-
 
211
    CALL_EXC_DISPATCH(exception) \
-
 
212
    load_regs();
-
 
213
 
-
 
214
/** Updates specified exception vector to jump to given handler.
68
/** Updates specified exception vector to jump to given handler.
215
 *
69
 *
216
 *  Addresses of handlers are stored in memory following exception vectors.
70
 *  Addresses of handlers are stored in memory following exception vectors.
217
 */
71
 */
218
static void install_handler(unsigned handler_addr, unsigned *vector)
72
static void install_handler(unsigned handler_addr, unsigned *vector)
Line 230... Line 84...
230
    /* store handler's address */
84
    /* store handler's address */
231
    *(vector + EXC_VECTORS) = handler_addr;
85
    *(vector + EXC_VECTORS) = handler_addr;
232
 
86
 
233
}
87
}
234
 
88
 
235
/** Low-level Reset Exception handler. */
-
 
236
static void reset_exception_entry(void)
-
 
237
{
-
 
238
    PROCESS_EXCEPTION(EXC_RESET);
-
 
239
}
-
 
240
 
-
 
241
/** Low-level Software Interrupt Exception handler. */
-
 
242
static void swi_exception_entry(void)
-
 
243
{
-
 
244
    PROCESS_EXCEPTION(EXC_SWI);
-
 
245
}
-
 
246
 
-
 
247
/** Low-level Undefined Instruction Exception handler. */
-
 
248
static void undef_instr_exception_entry(void)
-
 
249
{
-
 
250
    PROCESS_EXCEPTION(EXC_UNDEF_INSTR);
-
 
251
}
-
 
252
 
-
 
253
/** Low-level Fast Interrupt Exception handler. */
-
 
254
static void fiq_exception_entry(void)
-
 
255
{
-
 
256
    PROCESS_EXCEPTION(EXC_FIQ);
-
 
257
}
-
 
258
 
-
 
259
/** Low-level Prefetch Abort Exception handler. */
-
 
260
static void prefetch_abort_exception_entry(void)
-
 
261
{
-
 
262
    asm volatile (
-
 
263
        "sub lr, lr, #4"
-
 
264
    );
-
 
265
   
-
 
266
    PROCESS_EXCEPTION(EXC_PREFETCH_ABORT);
-
 
267
}
-
 
268
 
-
 
269
/** Low-level Data Abort Exception handler. */
-
 
270
static void data_abort_exception_entry(void)
-
 
271
{
-
 
272
    asm volatile (
-
 
273
        "sub lr, lr, #8"
-
 
274
    );
-
 
275
   
-
 
276
    PROCESS_EXCEPTION(EXC_DATA_ABORT);
-
 
277
}
-
 
278
 
-
 
279
/** Low-level Interrupt Exception handler.
-
 
280
 *
-
 
281
 * CPU is switched to Undefined mode before further interrupt processing
-
 
282
 * because of possible occurence of nested interrupt exception, which
-
 
283
 * would overwrite (and thus spoil) stack pointer.
-
 
284
 */
-
 
285
static void irq_exception_entry(void)
-
 
286
{
-
 
287
    asm volatile (
-
 
288
        "sub lr, lr, #4"
-
 
289
    );
-
 
290
   
-
 
291
    setup_stack_and_save_regs();
-
 
292
   
-
 
293
    switch_to_irq_servicing_mode();
-
 
294
   
-
 
295
    CALL_EXC_DISPATCH(EXC_IRQ)
-
 
296
 
-
 
297
    load_regs();
-
 
298
}
-
 
299
 
-
 
300
/** Software Interrupt handler.
89
/** Software Interrupt handler.
301
 *
90
 *
302
 * Dispatches the syscall.
91
 * Dispatches the syscall.
303
 */
92
 */
304
static void swi_exception(int exc_no, istate_t *istate)
93
static void swi_exception(int exc_no, istate_t *istate)
305
{
94
{
306
    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
95
    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
307
        istate->r3, istate->r4, istate->r5, istate->r6);
96
        istate->r3, istate->r4, istate->r5, istate->r6);
308
}
97
}
309
 
98
 
310
/** Returns the mask of active interrupts. */
-
 
311
static inline uint32_t gxemul_irqc_get_sources(void)
-
 
312
{
-
 
313
    return *((uint32_t *) gxemul_irqc);
-
 
314
}
-
 
315
 
-
 
316
/** Interrupt Exception handler.
-
 
317
 *
-
 
318
 * Determines the sources of interrupt and calls their handlers.
-
 
319
 */
-
 
320
static void irq_exception(int exc_no, istate_t *istate)
-
 
321
{
-
 
322
    uint32_t sources = gxemul_irqc_get_sources();
-
 
323
    unsigned int i;
-
 
324
   
-
 
325
    for (i = 0; i < GXEMUL_IRQC_MAX_IRQ; i++) {
-
 
326
        if (sources & (1 << i)) {
-
 
327
            irq_t *irq = irq_dispatch_and_lock(i);
-
 
328
            if (irq) {
-
 
329
                /* The IRQ handler was found. */
-
 
330
                irq->handler(irq);
-
 
331
                spinlock_unlock(&irq->lock);
-
 
332
            } else {
-
 
333
                /* Spurious interrupt.*/
-
 
334
                printf("cpu%d: spurious interrupt (inum=%d)\n",
-
 
335
                    CPU->id, i);
-
 
336
            }
-
 
337
        }
-
 
338
    }
-
 
339
}
-
 
340
 
-
 
341
/** Fills exception vectors with appropriate exception handlers. */
99
/** Fills exception vectors with appropriate exception handlers. */
342
void install_exception_handlers(void)
100
void install_exception_handlers(void)
343
{
101
{
344
    install_handler((unsigned) reset_exception_entry,
102
    install_handler((unsigned) reset_exception_entry,
345
        (unsigned *) EXC_RESET_VEC);
103
        (unsigned *) EXC_RESET_VEC);
Line 382... Line 140...
382
        :: [control_reg] "r" (control_reg)
140
        :: [control_reg] "r" (control_reg)
383
    );
141
    );
384
}
142
}
385
#endif
143
#endif
386
 
144
 
-
 
145
/** Interrupt Exception handler.
-
 
146
 *
-
 
147
 * Determines the sources of interrupt and calls their handlers.
-
 
148
 */
-
 
149
static void irq_exception(int exc_no, istate_t *istate)
-
 
150
{
-
 
151
    machine_irq_exception(exc_no, istate);
-
 
152
}
-
 
153
 
387
/** Initializes exception handling.
154
/** Initializes exception handling.
388
 *
155
 *
389
 * Installs low-level exception handlers and then registers
156
 * Installs low-level exception handlers and then registers
390
 * exceptions and their handlers to kernel exception dispatcher.
157
 * exceptions and their handlers to kernel exception dispatcher.
391
 */
158
 */