#include "or1200-utils.h"
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#include "or1200-utils.h"
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#include "int.h" // User interrupt handler header
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#include "int.h" // User interrupt handler header
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#include "uart.h"
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#include "uart.h"
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#include "printf.h"
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#include "printf.h"
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#define STR_EXCEPTION_OCCURED " exception occured.\n"
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#define STR_EXCEPTION_OCCURED " exception occured.\n"
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char *exception_strings[] = {
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char *exception_strings[] = {
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"An unknown", // 0
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"An unknown", // 0
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"A reset (?!)", // 1
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"A reset (?!)", // 1
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"A Bus Error", // 2
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"A Bus Error", // 2
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"A Data Page Fault", // 3
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"A Data Page Fault", // 3
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"An Instruction Page Fault", // 4
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"An Instruction Page Fault", // 4
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"A Tick-Timer", // 5
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"A Tick-Timer", // 5
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"An Alignment", // 6
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"An Alignment", // 6
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"An Illegal Instruction", // 7
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"An Illegal Instruction", // 7
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"An External Interrupt", // 8
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"An External Interrupt", // 8
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"A D-TLB Miss", // 9
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"A D-TLB Miss", // 9
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"An I-TLB Miss", // a
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"An I-TLB Miss", // a
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"A Range", // b
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"A Range", // b
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"A System Call", // c
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"A System Call", // c
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"A Floating-Point", // d
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"A Floating-Point", // d
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"A Trap", // e
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"A Trap", // e
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"A \"Reserved\"", // f
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"A \"Reserved\"", // f
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"A \"Reserved\"", // 10
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"A \"Reserved\"", // 10
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"A \"Reserved\"", // 11
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"A \"Reserved\"", // 11
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"A \"Reserved\"", // 12
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"A \"Reserved\"", // 12
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"A \"Reserved\"", // 13
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"A \"Reserved\"", // 13
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"A \"Reserved\"", // 14
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"A \"Reserved\"", // 14
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"An Implementation Specific \"Reserved\"", // 16
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"An Implementation Specific \"Reserved\"", // 16
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"An Implementation Specific \"Reserved\"", // 17
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"An Implementation Specific \"Reserved\"", // 17
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"An Implementation Specific \"Reserved\"", // 18
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"An Implementation Specific \"Reserved\"", // 18
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"A Custom", // 19
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"A Custom", // 19
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"A Custom", // 1a
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"A Custom", // 1a
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"A Custom", // 1b
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"A Custom", // 1b
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"A Custom", // 1c
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"A Custom", // 1c
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"A Custom", // 1d
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"A Custom", // 1d
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"A Custom", // 1e
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"A Custom", // 1e
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"A Custom", // 1f
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"A Custom", // 1f
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};
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};
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extern void int_main();
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extern void int_main(void);
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extern void cpu_timer_tick();
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extern void cpu_timer_tick(void);
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void (*except_handlers[]) (void ) = {0, // 0
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void (*except_handlers[]) (void) = {0, // 0
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0, // 1
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0, // 1
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0, // 2
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0, // 2
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0, // 3
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0, // 3
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0, // 4
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0, // 4
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cpu_timer_tick, // 5
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cpu_timer_tick, // 5
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0, // 6
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0, // 6
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0, // 7
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0, // 7
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int_main, // 8
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int_main, // 8
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0, // 9
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0, // 9
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0, // a
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0, // a
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0, // b
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0, // b
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0, // c
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0, // c
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0, // d
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0, // d
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0, // e
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0, // e
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0, // f
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0, // f
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0, // 10
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0, // 10
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0, // 11
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0, // 11
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0, // 12
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0, // 12
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0}; // 13
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0}; // 13
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void
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void
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add_handler(unsigned long vector, void (*handler) (void *))
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add_handler(unsigned long vector, void (*handler) (void))
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{
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{
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except_handlers[vector] = handler;
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except_handlers[vector] = handler;
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}
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}
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void default_exception_handler_c(unsigned exception_address,unsigned epc)
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void
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default_exception_handler_c(unsigned exception_address,unsigned epc)
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{
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{
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int exception_no = (exception_address >> 8) & 0x1f;
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int exception_no = (exception_address >> 8) & 0x1f;
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if (except_handlers[exception_no])
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if (except_handlers[exception_no])
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{
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{
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return (*except_handlers[exception_no])();
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(*except_handlers[exception_no])();
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return;
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}
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}
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// Init uart here, incase it hasn't been
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// init uart here, incase it hasn't been
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uart_init(DEFAULT_UART);
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uart_init(DEFAULT_UART);
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printf("EPC = 0x%.8x\n", exception_address);
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printf("EPC = 0x%.8x\n", exception_address);
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// Output initial messaging using low-level functions incase
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// Output initial messaging using low-level functions incase
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// something really bad happened.
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// something really bad happened.
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printf("%s%s", exception_strings[exception_no],
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printf("%s%s", exception_strings[exception_no],
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STR_EXCEPTION_OCCURED);
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STR_EXCEPTION_OCCURED);
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// Icing on the cake using fancy functions
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// Icing on the cake using fancy functions
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printf("EPC = 0x%.8x\n", epc);
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printf("EPC = 0x%.8x\n", epc);
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report(exception_address);
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report(exception_address);
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report(epc);
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report(epc);
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__asm__("l.nop 1");
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__asm__("l.nop 1");
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for(;;);
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for(;;);
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}
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}
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