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#include <arch/regutils.h>
 39 
#include <arch/regutils.h>
40 
#include <interrupt.h>
 40 
#include <interrupt.h>
41 
#include <arch/drivers/gxemul.h>
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#include <arch/drivers/gxemul.h>
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#include <arch/mm/page_fault.h>
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#include <arch/mm/page_fault.h>
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#include <print.h>
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#include <print.h>
- 
 
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#include <syscall/syscall.h>
44 
 
 45 
 
45 
#define PREFETCH_OFFSET     0x8
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#define PREFETCH_OFFSET     0x8
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#define BRANCH_OPCODE       0xea000000
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#define BRANCH_OPCODE       0xea000000
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#define LDR_OPCODE      0xe59ff000
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#define LDR_OPCODE      0xe59ff000
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#define VALID_BRANCH_MASK   0xff000000
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#define VALID_BRANCH_MASK   0xff000000
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    bne 1f                  \n\
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    bne 1f                  \n\
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                        \n\
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                        \n\
64 
    @prev mode was usermode         \n\
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    @prev mode was usermode         \n\
65 
    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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    stmfd r13!, {lr}            \n\
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    stmfd r13!, {r0-r12, r13, lr}       \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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                        \n\
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                        \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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                        \n\
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                        \n\
83 
    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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    stmfd r13!, {r3}            \n\
 - 
 
86 
    stmfd r13!, {r4-r12}            \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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    mov r1, r13             \n\
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    mov r1, r13             \n\
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    mov lr, #0              \n\
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    mov sp, #0              \n\
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    msr cpsr_c, r0              \n\
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    msr cpsr_c, r0              \n\
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                        \n\
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                        \n\
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    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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    mov r13, r1             \n\
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    mov r13, r1             \n\
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    mov lr, r2              \n\
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    mov lr, r2              \n\
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    msr cpsr_c, r0              \n\
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    msr cpsr_c, r0              \n\
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                        \n\
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                        \n\
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    @actual return              \n\
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    @actual return              \n\
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4:                      \n\
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                        \n\
131 
    ldmfd r13!, {r0-r12, r13, pc}^"
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    ldmfd r13, {r0-r12, pc}^        \n\
- 
 
 135 
4:"
132 
);
 136 
);
133 
}
 137 
}
134 
 
 138 
 
135 
 
 139 
 
- 
 
 140 
 
136 
#define SAVE_REGS_TO_STACK          \
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/*#define SAVE_REGS_TO_STACK            \
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    asm("stmfd r13!, {r0-r12, r13, lr}");   \
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    asm("stmfd r13!, {r0-r12, r13, lr}");   \
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    asm("mrs r14, spsr");           \
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    asm("mrs r14, spsr");           \
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    asm("stmfd r13!, {r14}");
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    asm("stmfd r13!, {r14}");
140 
 
 145 
*/
141 
 
 146 
 
142 
 
 147 
 
143 
#define CALL_EXC_DISPATCH(exception)        \
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#define CALL_EXC_DISPATCH(exception)        \
144 
    asm("mov r0, %0" : : "i" (exception));  \
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    asm("mov r0, %0" : : "i" (exception));  \
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    asm("mov r1, r13");         \
 150 
    asm("mov r1, r13");         \
146 
    asm("bl exc_dispatch");    
151 
    asm("bl exc_dispatch");    
147 
 
 152 
 
148 
 
 153 
 
149 
/**Loads registers from the stack and resets SPSR before exitting exception
 154 
/**Loads registers from the stack and resets SPSR before exitting exception
150 
 * handler.
 155 
 * handler.
151 
 */
 156 
 
152 
#define LOAD_REGS_FROM_STACK            \
 157 
#define LOAD_REGS_FROM_STACK            \
153 
    asm("ldmfd r13!, {r14}");       \
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    asm("ldmfd r13!, {r14}");       \
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    asm("msr spsr, r14");           \
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    asm("msr spsr, r14");           \
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    asm("ldmfd r13!, {r0-r12, r13, pc}^");
 160 
    asm("ldmfd r13!, {r0-r12, r13, pc}^");
156 
 
 161 
 */
157 
 
 162 
 
158 
   
 163 
   
159 
/** General exception handler.
 164 
/** General exception handler.
160 
 *  Stores registers, dispatches the exception,
 165 
 *  Stores registers, dispatches the exception,
161 
 *  and finally restores registers and returns from exception processing.
 166 
 *  and finally restores registers and returns from exception processing.
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230 
 
 235 
 
231 
/** Low-level Interrupt Exception handler */
 236 
/** Low-level Interrupt Exception handler */
232 
static void irq_exception_entry()
 237 
static void irq_exception_entry()
233 
{
 238 
{
234 
    asm("sub lr, lr, #4");
 239 
    asm("sub lr, lr, #4");
235 
//  SAVE_REGS_TO_STACK     
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236 
//  CALL_EXC_DISPATCH(EXC_IRQ)     
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237 
//  LOAD_REGS_FROM_STACK;
 - 
 
238 
    PROCESS_EXCEPTION(EXC_IRQ);
 240 
    PROCESS_EXCEPTION(EXC_IRQ);
239 
}
 241 
}
240 
 
 242 
 
241 
// static void prefetch_abort_exception(int exc_no, istate_t* istate)
 243 
/** Software Interrupt handler.
242 
// {
 244 
 *
243 
//  dputs("(PREFETCH|DATA) ABORT exception caught, not processed.\n");
 245 
 * Dispatches the syscall.
244 
// }
 246 
 */
245 
 
 - 
 
246 
static void swi_exception(int exc_no, istate_t* istate)
 247 
static void swi_exception(int exc_no, istate_t* istate)
247 
{
 248 
{
248 
    dprintf("\nIstate dump:\n");
 249 
    istate->r0 = syscall_handler(
249 
    dprintf("    r0:%X    r1:%X    r2:%X    r3:%X\n", istate->r0,  istate->r1, istate->r2,  istate->r3);
 250 
        istate->r0,
250 
    dprintf("    r4:%X    r5:%X    r6:%X    r7:%X\n", istate->r4,  istate->r5, istate->r6,  istate->r7);
 251 
        istate->r1,
251 
    dprintf("    r8:%X    r9:%X   r10:%X     r11:%X\n", istate->r8,  istate->r9, istate->r10, istate->r11);
 252 
        istate->r2,
252 
    dprintf("      r12:%X    r13:%X    lr:%X  spsr:%X\n", istate->r12, istate->sp, istate->lr,  istate->spsr);
 253 
        istate->r3,
253 
    dprintf("   prev_lr:%X    prev_sp:%X\n", istate->prev_lr, istate->prev_sp);
 254 
        istate->r4);
254 
}
 255 
}
255 
 
 256 
 
256 
/** Interrupt Exception handler.
 257 
/** Interrupt Exception handler.
- 
 
 258 
 *
257 
 * Determines the sources of interrupt, and calls their handlers.
 259 
 * Determines the sources of interrupt, and calls their handlers.
258 
 */
 260 
 */
259 
static void irq_exception(int exc_no, istate_t* istate)
 261 
static void irq_exception(int exc_no, istate_t* istate)
260 
{
 262 
{
261 
// TODO: move somewhere to gxemul.c and use machine_irq_exception (or some similar
 263 
// TODO: move somewhere to gxemul.c and use machine_irq_exception (or some similar
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385 
 
 387 
 
386 
        /* TODO if you want to test other exceptions than IRQ,
 388 
        /* TODO if you want to test other exceptions than IRQ,
387 
        make stack analogous to irq_stack (in start.S),
 389 
        make stack analogous to irq_stack (in start.S),
388 
        and then set stack pointer here */
 390 
        and then set stack pointer here */
389 
 
 391 
 
390 
        current_status_reg_control_write( cspr);
 392 
        current_status_reg_control_write(cspr);
391 
 
 393 
 
392 
}
 394 
}
393 
 
 395 
 
394 
/** @}
 396 
/** @}
395 
 */
 397 
 */