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https://github.com/dingusdev/dingusppc.git
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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
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/** @file Handling of low-level PPC exceptions. */
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#include <setjmp.h>
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#include "ppcemu.h"
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jmp_buf exc_env; /* Global exception environment. */
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[[noreturn]] void ppc_exception_handler(Except_Type exception_type,
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uint32_t srr1_bits)
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{
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grab_exception = true;
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bb_kind = BB_end_kind::BB_EXCEPTION;
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switch(exception_type) {
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case Except_Type::EXC_SYSTEM_RESET:
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0100;
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break;
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case Except_Type::EXC_MACHINE_CHECK:
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if (!(ppc_state.ppc_msr & 0x1000)) {
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/* TODO: handle internal checkstop */
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}
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0200;
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break;
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case Except_Type::EXC_DSI:
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0300;
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break;
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case Except_Type::EXC_ISI:
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ppc_state.ppc_spr[26] = ppc_next_instruction_address;
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ppc_next_instruction_address = 0x0400;
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break;
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case Except_Type::EXC_EXT_INT:
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ppc_state.ppc_spr[26] = ppc_next_instruction_address;
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ppc_next_instruction_address = 0x0500;
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break;
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case Except_Type::EXC_ALIGNMENT:
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0600;
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break;
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case Except_Type::EXC_PROGRAM:
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0700;
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break;
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case Except_Type::EXC_NO_FPU:
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ppc_state.ppc_spr[26] = ppc_cur_instruction & 0xFFFFFFFC;
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ppc_next_instruction_address = 0x0800;
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break;
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case Except_Type::EXC_DECR:
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ppc_state.ppc_spr[26] = (ppc_cur_instruction & 0xFFFFFFFC) + 4;
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ppc_next_instruction_address = 0x0900;
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break;
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case Except_Type::EXC_SYSCALL:
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ppc_state.ppc_spr[26] = (ppc_cur_instruction & 0xFFFFFFFC) + 4;
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ppc_next_instruction_address = 0x0C00;
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break;
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case Except_Type::EXC_TRACE:
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ppc_state.ppc_spr[26] = (ppc_cur_instruction & 0xFFFFFFFC) + 4;
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ppc_next_instruction_address = 0x0D00;
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break;
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default:
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//printf("Unknown exception occured: %X\n", exception_type);
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//exit(-1);
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break;
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}
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ppc_state.ppc_spr[27] = (ppc_state.ppc_msr & 0x0000FF73) | srr1_bits;
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ppc_state.ppc_msr &= 0xFFFB1041;
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/* copy MSR[ILE] to MSR[LE] */
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ppc_state.ppc_msr = (ppc_state.ppc_msr & 0xFFFFFFFE) |
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((ppc_state.ppc_msr >> 16) & 1);
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if (ppc_state.ppc_msr & 0x40) {
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ppc_next_instruction_address |= 0xFFF00000;
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}
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longjmp(exc_env, 2); /* return to the main execution loop. */
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}
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