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/** Switches to kernel stack and saves all registers there.
 62 
/** Switches to kernel stack and saves all registers there.
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 *
 63 
 *
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 * Temporary exception stack is used to save a few registers
 64 
 * Temporary exception stack is used to save a few registers
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 * before stack switch takes place.
 65 
 * before stack switch takes place.
- 
 
 66 
 *
66 
 */
 67 
 */
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inline static void setup_stack_and_save_regs()
 68 
inline static void setup_stack_and_save_regs()
68 
{
 69 
{
69 
    asm volatile(
 70 
    asm volatile (
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        "ldr r13, =exc_stack        \n"
 71 
        "ldr r13, =exc_stack\n"
71 
        "stmfd r13!, {r0}       \n"
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        "stmfd r13!, {r0}\n"
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        "mrs r0, spsr           \n"
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        "mrs r0, spsr\n"
73 
        "and r0, r0, #0x1f      \n"
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        "and r0, r0, #0x1f\n"
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        "cmp r0, #0x10          \n"
 75 
        "cmp r0, #0x10\n"
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        "bne 1f             \n"
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        "bne 1f\n"
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 77 
       
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        /* prev mode was usermode */
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        /* prev mode was usermode */
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        "ldmfd r13!, {r0}       \n"
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        "ldmfd r13!, {r0}\n"
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        "ldr r13, =supervisor_sp    \n"
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        "ldr r13, =supervisor_sp\n"
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        "ldr r13, [r13]         \n"
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        "ldr r13, [r13]\n"
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        "stmfd r13!, {lr}       \n"
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        "stmfd r13!, {lr}\n"
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        "stmfd r13!, {r0-r12}       \n"
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        "stmfd r13!, {r0-r12}\n"
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        "stmfd r13!, {r13, lr}^     \n"
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        "stmfd r13!, {r13, lr}^\n"
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        "mrs r0, spsr           \n"
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        "mrs r0, spsr\n"
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        "stmfd r13!, {r0}       \n"
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        "stmfd r13!, {r0}\n"
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        "b 2f               \n"
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        "b 2f\n"
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 88 
       
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        /* mode was not usermode */
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        /* mode was not usermode */
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    "1:\n"
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        "1:\n"
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        "stmfd r13!, {r1, r2, r3}   \n"
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            "stmfd r13!, {r1, r2, r3}\n"
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        "mrs r1, cpsr           \n"
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            "mrs r1, cpsr\n"
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        "mov r2, lr         \n"
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            "mov r2, lr\n"
93 
        "bic r1, r1, #0x1f      \n"
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            "bic r1, r1, #0x1f\n"
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        "orr r1, r1, r0         \n"
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            "orr r1, r1, r0\n"
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        "mrs r0, cpsr           \n"
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            "mrs r0, cpsr\n"
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        "msr cpsr_c, r1         \n"
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            "msr cpsr_c, r1\n"
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 98 
           
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        "mov r3, r13            \n"
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            "mov r3, r13\n"
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        "stmfd r13!, {r2}       \n"
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            "stmfd r13!, {r2}\n"
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        "mov r2, lr         \n"
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            "mov r2, lr\n"
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        "stmfd r13!, {r4-r12}       \n"
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            "stmfd r13!, {r4-r12}\n"
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        "mov r1, r13            \n"
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            "mov r1, r13\n"
- 
 
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        /* the following two lines are for debugging */
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            /* the following two lines are for debugging */
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        "mov sp, #0         \n"
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            "mov sp, #0\n"
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        "mov lr, #0         \n"
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            "mov lr, #0\n"
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        "msr cpsr_c, r0         \n"
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            "msr cpsr_c, r0\n"
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 109 
           
108 
        "ldmfd r13!, {r4, r5, r6, r7}   \n"
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            "ldmfd r13!, {r4, r5, r6, r7}\n"
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        "stmfd r1!, {r4, r5, r6}    \n"
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            "stmfd r1!, {r4, r5, r6}\n"
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        "stmfd r1!, {r7}        \n"
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            "stmfd r1!, {r7}\n"
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        "stmfd r1!, {r2}        \n"
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            "stmfd r1!, {r2}\n"
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        "stmfd r1!, {r3}        \n"
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            "stmfd r1!, {r3}\n"
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        "mrs r0, spsr           \n"
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            "mrs r0, spsr\n"
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        "stmfd r1!, {r0}        \n"
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            "stmfd r1!, {r0}\n"
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        "mov r13, r1            \n"
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            "mov r13, r1\n"
- 
 
 118 
           
116 
    "2:\n"
 119 
        "2:\n"
117 
    );
 120 
    );
118 
}
 121 
}
119 
 
 122 
 
120 
/** Returns from exception mode.
 123 
/** Returns from exception mode.
121 
 *
 124 
 *
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        "ldmfd sp!, {r0-r3}     \n"
 190 
        "ldmfd sp!, {r0-r3}     \n"
188 
    );
 191 
    );
189 
}
 192 
}
190 
 
 193 
 
191 
/** Calls exception dispatch routine. */
 194 
/** Calls exception dispatch routine. */
192 
#define CALL_EXC_DISPATCH(exception)        \
 195 
#define CALL_EXC_DISPATCH(exception) \
- 
 
 196 
    asm volatile ( \
193 
    asm("mov r0, %0" : : "i" (exception));  \
 197 
        "mov r0, %[exc]\n" \
194 
    asm("mov r1, r13");         \
 198 
        "mov r1, r13\n" \
195 
    asm("bl exc_dispatch");    
199 
        "bl exc_dispatch\n" \
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 200 
        :: [exc] "i" (exception) \
- 
 
 201 
    );\
196 
 
 202 
 
197 
/** General exception handler.
 203 
/** General exception handler.
198 
 *
 204 
 *
199 
 *  Stores registers, dispatches the exception,
 205 
 *  Stores registers, dispatches the exception,
200 
 *  and finally restores registers and returns from exception processing.
 206 
 *  and finally restores registers and returns from exception processing.
201 
 *
 207 
 *
202 
 *  @param exception Exception number.
 208 
 *  @param exception Exception number.
203 
 */
 209 
 */
204 
#define PROCESS_EXCEPTION(exception)        \
 210 
#define PROCESS_EXCEPTION(exception) \
205 
    setup_stack_and_save_regs();        \
 211 
    setup_stack_and_save_regs(); \
206 
    CALL_EXC_DISPATCH(exception)        \
 212 
    CALL_EXC_DISPATCH(exception) \
207 
    load_regs();
 213 
    load_regs();
208 
 
 214 
 
209 
/** Updates specified exception vector to jump to given handler.
 215 
/** Updates specified exception vector to jump to given handler.
210 
 *
 216 
 *
211 
 *  Addresses of handlers are stored in memory following exception vectors.
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 *  Addresses of handlers are stored in memory following exception vectors.
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/** Activates use of high exception vectors addresses. */
 337 
/** Activates use of high exception vectors addresses. */
332 
static void high_vectors(void)
 338 
static void high_vectors(void)
333 
{
 339 
{
334 
    uint32_t control_reg;
 340 
    uint32_t control_reg;
335 
   
 341 
   
- 
 
 342 
    asm volatile (
- 
 
 343 
        "mrc p15, 0, %[control_reg], c1, c1"
336 
    asm volatile("mrc p15, 0, %0, c1, c1" : "=r" (control_reg));
 344 
        : [control_reg] "=r" (control_reg)
- 
 
 345 
    );
337 
   
 346 
   
338 
    /* switch on the high vectors bit */
 347 
    /* switch on the high vectors bit */
339 
    control_reg |= CP15_R1_HIGH_VECTORS_BIT;
 348 
    control_reg |= CP15_R1_HIGH_VECTORS_BIT;
340 
   
 349 
   
- 
 
 350 
    asm volatile (
- 
 
 351 
        "mcr p15, 0, %[control_reg], c1, c1"
341 
    asm volatile("mcr p15, 0, %0, c1, c1" : : "r" (control_reg));
 352 
        :: [control_reg] "r" (control_reg)
- 
 
 353 
    );
342 
}
 354 
}
343 
#endif
 355 
#endif
344 
 
 356 
 
345 
/** Initializes exception handling.
 357 
/** Initializes exception handling.
346 
 *
 358 
 *
347 
 * Installs low-level exception handlers and then registers
 359 
 * Installs low-level exception handlers and then registers
348 
 * exceptions and their handlers to kernel exception dispatcher.
 360 
 * exceptions and their handlers to kernel exception dispatcher.
349 
 */
 361 
 */
350 
void exception_init(void)
 362 
void exception_init(void)
351 
{
 363 
{