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Illegal opcodes raise program exception.

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This commit is contained in:
Maxim Poliakovski 2020-11-29 23:53:03 +01:00
parent 54fcfca8e9
commit acfa09af65
3 changed files with 23 additions and 54 deletions
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3
cpu/ppc/ppcemu.h
View File

@ -246,7 +246,8 @@ extern uint32_t supervisor_inst_num;
extern void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t proc_version);
extern void ppc_mmu_init();
void ppc_illegalop();
[[noreturn]] void ppc_illegalop();
[[noreturn]] void ppc_fpu_off();
void ppc_illegalsubop19();
void ppc_illegalsubop31();
void ppc_illegalsubop59();

64
cpu/ppc/ppcexec.cpp
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@ -73,7 +73,7 @@ uint8_t tbr_factor; /* cycles_count to TBR freq ratio in 2^x units */
/** Primary opcode (bits 0...5) lookup table. */
static PPCOpcode OpcodeGrabber[] = {
ppc_illegalop, ppc_illegalop, ppc_illegalop, ppc_twi, ppc_opcode4, ppc_illegalop,
ppc_illegalop, ppc_illegalop, ppc_illegalop, ppc_twi, ppc_illegalop, ppc_illegalop,
ppc_illegalop, ppc_mulli, ppc_subfic, power_dozi, ppc_cmpli, ppc_cmpi,
ppc_addic, ppc_addicdot, ppc_addi, ppc_addis, ppc_opcode16, ppc_sc,
ppc_opcode18, ppc_opcode19, ppc_rlwimi, ppc_rlwinm, power_rlmi, ppc_rlwnm,
@ -101,9 +101,9 @@ static PPCOpcode SubOpcode18Grabber[] = {
/** Instructions decoding tables for integer,
single floating-point, and double-floating point ops respectively */
PPCOpcode SubOpcode31Grabber[1024] = {ppc_illegalsubop19};
PPCOpcode SubOpcode59Grabber[1024] = {ppc_illegalsubop19};
PPCOpcode SubOpcode63Grabber[1024] = {ppc_illegalsubop19};
PPCOpcode SubOpcode31Grabber[1024] = { ppc_illegalop };
PPCOpcode SubOpcode59Grabber[1024] = { ppc_fpu_off };
PPCOpcode SubOpcode63Grabber[1024] = { ppc_fpu_off };
#define UPDATE_TBR_DEC \
@ -117,50 +117,18 @@ PPCOpcode SubOpcode63Grabber[1024] = {ppc_illegalsubop19};
old_cycles_count += delta << tbr_factor; \
}
/** Exception helpers. */
[[noreturn]] void ppc_illegalop() {
ppc_exception_handler(Except_Type::EXC_PROGRAM, 0x00080000);
}
[[noreturn]] void ppc_fpu_off() {
ppc_exception_handler(Except_Type::EXC_PROGRAM, 0x00100000);
}
/** Opcode decoding functions. */
void ppc_illegalop() {
LOG_F(ERROR, "Illegal opcode reported: 0x%X Report this! \n", ppc_cur_instruction);
exit(-1);
}
void ppc_illegalsubop19() {
uint16_t illegal_subcode = ppc_cur_instruction & 0x7FF;
uint32_t grab_it = (uint32_t)illegal_subcode;
LOG_F(ERROR, "Illegal subopcode for 19 reported: %d Report this! \n", grab_it);
exit(-1);
}
void ppc_illegalsubop31() {
uint16_t illegal_subcode = ppc_cur_instruction & 0x7FF;
uint32_t grab_it = (uint32_t)illegal_subcode;
LOG_F(ERROR, "Illegal subopcode for 31 reported: %d Report this! \n", grab_it);
exit(-1);
}
void ppc_illegalsubop59() {
uint16_t illegal_subcode = ppc_cur_instruction & 0x7FF;
uint32_t grab_it = (uint32_t)illegal_subcode;
LOG_F(ERROR, "Illegal subopcode for 59 reported: %d Report this! \n", grab_it);
exit(-1);
}
void ppc_illegalsubop63() {
uint16_t illegal_subcode = ppc_cur_instruction & 0x7FF;
uint32_t grab_it = (uint32_t)illegal_subcode;
LOG_F(ERROR, "Illegal subopcode for 63 reported: %d Report this! \n", grab_it);
exit(-1);
}
void ppc_opcode4() {
LOG_F(INFO, "Reading from Opcode 4 table \n");
uint8_t subop_grab = ppc_cur_instruction & 3;
uint32_t regrab = (uint32_t)subop_grab;
LOG_F(ERROR, "Executing subopcode entry %d \n"
".. or would if I bothered to implement it. SORRY!", regrab);
exit(-1);
}
void ppc_opcode16() {
SubOpcode16Grabber[ppc_cur_instruction & 3]();
}
@ -218,8 +186,8 @@ void ppc_opcode19() {
case 898:
ppc_cror();
break;
default: // Illegal opcode - should never happen
ppc_illegalsubop19();
default:
ppc_illegalop();
}
}
}

10
cpu/ppc/ppcopcodes.cpp
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@ -295,7 +295,7 @@ void dppc_interpreter::ppc_addze() {
} else {
ppc_state.spr[SPR::XER] &= 0xDFFFFFFFUL;
}
if (oe_flag)
ppc_setsoov(ppc_result_a, 0xFFFFFFFFUL, ppc_result_d);
if (rc_flag)
@ -355,7 +355,7 @@ void dppc_interpreter::ppc_subfme() {
uint32_t grab_xer = !!(ppc_state.spr[SPR::XER] & 0x20000000);
ppc_result_d = ~ppc_result_a + grab_xer - 1;
ppc_carry(~ppc_result_a, ppc_result_d);
if (oe_flag)
ppc_setsoov(0xFFFFFFFF, ppc_result_a, ppc_result_d);
if (rc_flag)
@ -506,7 +506,7 @@ void dppc_interpreter::ppc_neg() {
else
ppc_state.spr[SPR::XER] &= 0xBFFFFFFF;
}
if (rc_flag)
ppc_changecrf0(ppc_result_d);
@ -602,7 +602,7 @@ void dppc_interpreter::ppc_divw() {
if (oe_flag)
ppc_state.spr[SPR::XER] |= 0xC0000000;
}
}
else { /* normal signed devision */
ppc_result_d = (int32_t)ppc_result_a / (int32_t)ppc_result_b;
@ -1463,7 +1463,7 @@ void dppc_interpreter::ppc_stwx() {
void dppc_interpreter::ppc_stwcx() {
// PLACEHOLDER CODE FOR STWCX - We need to check for reserve memory
if (rc_flag == 0) {
ppc_illegalsubop31();
ppc_illegalop();
} else {
ppc_grab_regssab();
ppc_effective_address = (reg_a == 0) ? ppc_result_b : (ppc_result_a + ppc_result_b);