forked from Lephenixnoir/gint
173 lines
3.1 KiB
C
173 lines
3.1 KiB
C
#include <internals/exceptions.h>
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#include <display.h>
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#include <string.h>
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//---
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// On-screen error messages
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//---
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#define print(x, y, str) dtext(6 * (x) - 5, 8 * (y) - 7, str)
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static void print_hex(int x, int y, uint32_t n, int digits)
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{
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#define hexdigit(n) ((n) + '0' + 39 * ((n) > 9))
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char str[9];
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if(digits >= 8) digits = 8;
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str[digits] = 0;
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while(digits)
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{
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str[digits - 1] = hexdigit(n & 0xf);
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n >>= 4;
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digits--;
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}
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print(x, y, str);
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#undef hexdigit
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}
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static void show_error(const char *name, uint32_t *access_mode, uint32_t *tea,
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uint32_t *opcode)
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{
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uint32_t *vram = display_getCurrentVRAM();
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uint32_t spc, ssr;
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__asm__("stc spc, %0" : "=r"(spc));
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__asm__("stc ssr, %0" : "=r"(ssr));
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dclear();
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text_configure(NULL, color_black);
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print(3, 1, "EXCEPTION RAISED!");
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for(int i = 0; i < 36; i++) vram[i] = ~vram[i];
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print(1 + ((21 - strlen(name)) >> 1), 2, name);
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print(4, 4, "PC");
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print_hex(7, 4, spc, 8);
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print(4, 5, "SR");
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print_hex(7, 5, ssr, 8);
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int y = 6;
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if(access_mode)
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{
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print(2, y, "Type");
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print(7, y++, *access_mode == 1 ? "Code/Data read" :
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"Data write");
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}
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if(tea)
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{
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print(3, y, "TEA");
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print_hex(7, y++, *tea, 8);
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}
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if(opcode)
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{
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print(2, y, "Code");
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print_hex(7, y++, *opcode, 4);
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}
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dupdate();
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while(1);
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}
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#undef print
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//---
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// Exception handlers
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//---
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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/*
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exch_address_error()
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CPU address error, e.g. alignment issues.
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*/
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void exch_address_error(uint32_t pc, uint32_t tea, uint32_t access)
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{
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show_error("Address error", &access, &tea, NULL);
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}
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/*
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exch_tlb_protection_violation()
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You don't have the right to access this address.
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*/
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void exch_tlb_protection_violation(uint32_t pc, uint32_t tea, uint32_t access)
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{
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show_error("TLB protection", &access, &tea, NULL);
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}
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/*
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exch_tlb_invalid()
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The translation info for this address is marked as invalid.
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*/
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void exch_tlb_invalid(uint32_t pc, uint32_t tea, uint32_t access)
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{
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show_error("TLB invalid", &access, &tea, NULL);
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}
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/*
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exch_illegal_instruction()
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What's this opcode anyway?
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*/
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void exch_illegal_instruction(uint32_t pc, uint32_t opcode)
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{
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show_error("Illegal instruction", NULL, NULL, &opcode);
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}
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/*
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exch_illegal_slot()
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You can't execute this in a delay slot.
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*/
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void exch_illegal_slot(uint32_t pc, uint32_t opcode)
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{
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show_error("Illegal slot", NULL, NULL, &opcode);
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}
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/*
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exch_user_break()
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One of the user break conditions you requested was fulfilled.
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*/
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void exch_user_break(void)
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{
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show_error("User break", NULL, NULL, NULL);
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}
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/*
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exch_initial_page_write()
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You can't write to this memory page, it's too early.
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*/
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void exch_initial_page_write(void)
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{
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show_error("Initial page write", NULL, NULL, NULL);
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}
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/*
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exch_trap()
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You asked for it.
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*/
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void exch_trap(uint32_t pc, uint32_t trap)
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{
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}
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/*
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exch_dma_address()
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The DMAC is accessing badly-aligned addresses.
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*/
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void exch_dma_address(void)
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{
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show_error("DMA address error", NULL, NULL, NULL);
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}
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/*
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exch_tlb_miss()
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This virtual address points nowhere.
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*/
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void exch_tlb_miss(uint32_t pc, uint32_t tea, uint32_t access)
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{
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show_error("TLB miss", &access, &tea, NULL);
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}
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#pragma GCC diagnostic pop
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