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-rw-r--r--src/core/arm/dyncom/arm_dyncom_dec.cpp25
-rw-r--r--src/core/arm/dyncom/arm_dyncom_dec.h16
-rw-r--r--src/core/arm/dyncom/arm_dyncom_interpreter.cpp93
-rw-r--r--src/core/arm/dyncom/arm_dyncom_thumb.cpp28
-rw-r--r--src/core/arm/dyncom/arm_dyncom_thumb.h28
-rw-r--r--src/core/arm/skyeye_common/armstate.h25
6 files changed, 91 insertions, 124 deletions
diff --git a/src/core/arm/dyncom/arm_dyncom_dec.cpp b/src/core/arm/dyncom/arm_dyncom_dec.cpp
index 3ab9f2c17..ee4288314 100644
--- a/src/core/arm/dyncom/arm_dyncom_dec.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_dec.cpp
@@ -5,7 +5,7 @@
#include "core/arm/dyncom/arm_dyncom_dec.h"
#include "core/arm/skyeye_common/armsupp.h"
-const ISEITEM arm_instruction[] = {
+const InstructionSetEncodingItem arm_instruction[] = {
{ "vmla", 4, ARMVFP2, { 23, 27, 0x1C, 20, 21, 0x0, 9, 11, 0x5, 4, 4, 0 }},
{ "vmls", 7, ARMVFP2, { 28, 31, 0xF, 25, 27, 0x1, 23, 23, 1, 11, 11, 0, 8, 9, 0x2, 6, 6, 1, 4, 4, 0 }},
{ "vnmla", 4, ARMVFP2, { 23, 27, 0x1C, 20, 21, 0x1, 9, 11, 0x5, 4, 4, 0 }},
@@ -207,7 +207,7 @@ const ISEITEM arm_instruction[] = {
{ "bbl", 1, 0, { 25, 27, 0x00000005 }},
};
-const ISEITEM arm_exclusion_code[] = {
+const InstructionSetEncodingItem arm_exclusion_code[] = {
{ "vmla", 0, ARMVFP2, { 0 }},
{ "vmls", 0, ARMVFP2, { 0 }},
{ "vnmla", 0, ARMVFP2, { 0 }},
@@ -414,14 +414,13 @@ const ISEITEM arm_exclusion_code[] = {
{ "invalid", 0, INVALID, { 0 }}
};
-int decode_arm_instr(u32 instr, s32* idx) {
+ARMDecodeStatus DecodeARMInstruction(u32 instr, s32* idx) {
int n = 0;
int base = 0;
- int ret = DECODE_FAILURE;
- int i = 0;
- int instr_slots = sizeof(arm_instruction) / sizeof(ISEITEM);
+ int instr_slots = sizeof(arm_instruction) / sizeof(InstructionSetEncodingItem);
+ ARMDecodeStatus ret = ARMDecodeStatus::FAILURE;
- for (i = 0; i < instr_slots; i++) {
+ for (int i = 0; i < instr_slots; i++) {
n = arm_instruction[i].attribute_value;
base = 0;
@@ -438,11 +437,11 @@ int decode_arm_instr(u32 instr, s32* idx) {
n--;
}
- // All conditions is satisfied.
+ // All conditions are satisfied.
if (n == 0)
- ret = DECODE_SUCCESS;
+ ret = ARMDecodeStatus::SUCCESS;
- if (ret == DECODE_SUCCESS) {
+ if (ret == ARMDecodeStatus::SUCCESS) {
n = arm_exclusion_code[i].attribute_value;
if (n != 0) {
base = 0;
@@ -454,13 +453,13 @@ int decode_arm_instr(u32 instr, s32* idx) {
n--;
}
- // All conditions is satisfied.
+ // All conditions are satisfied.
if (n == 0)
- ret = DECODE_FAILURE;
+ ret = ARMDecodeStatus::FAILURE;
}
}
- if (ret == DECODE_SUCCESS) {
+ if (ret == ARMDecodeStatus::SUCCESS) {
*idx = i;
return ret;
}
diff --git a/src/core/arm/dyncom/arm_dyncom_dec.h b/src/core/arm/dyncom/arm_dyncom_dec.h
index 5f6279627..d7170e0fc 100644
--- a/src/core/arm/dyncom/arm_dyncom_dec.h
+++ b/src/core/arm/dyncom/arm_dyncom_dec.h
@@ -6,22 +6,20 @@
#include "common/common_types.h"
-int decode_arm_instr(u32 instr, s32* idx);
-
-enum DECODE_STATUS {
- DECODE_SUCCESS,
- DECODE_FAILURE
+enum class ARMDecodeStatus {
+ SUCCESS,
+ FAILURE
};
-struct instruction_set_encoding_item {
+ARMDecodeStatus DecodeARMInstruction(u32 instr, s32* idx);
+
+struct InstructionSetEncodingItem {
const char *name;
int attribute_value;
int version;
u32 content[21];
};
-typedef struct instruction_set_encoding_item ISEITEM;
-
// ARM versions
enum {
INVALID = 0,
@@ -38,4 +36,4 @@ enum {
ARMV6K,
};
-extern const ISEITEM arm_instruction[];
+extern const InstructionSetEncodingItem arm_instruction[];
diff --git a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
index cf09acb4e..d022546ed 100644
--- a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
@@ -47,27 +47,6 @@ enum {
typedef unsigned int (*shtop_fp_t)(ARMul_State* cpu, unsigned int sht_oper);
-// Defines a reservation granule of 2 words, which protects the first 2 words starting at the tag.
-// This is the smallest granule allowed by the v7 spec, and is coincidentally just large enough to
-// support LDR/STREXD.
-static const u32 RESERVATION_GRANULE_MASK = 0xFFFFFFF8;
-
-// Exclusive memory access
-static int exclusive_detect(ARMul_State* state, u32 addr) {
- if(state->exclusive_tag == (addr & RESERVATION_GRANULE_MASK))
- return 0;
- else
- return -1;
-}
-
-static void add_exclusive_addr(ARMul_State* state, u32 addr){
- state->exclusive_tag = addr & RESERVATION_GRANULE_MASK;
-}
-
-static void remove_exclusive(ARMul_State* state, u32 addr){
- state->exclusive_tag = 0xFFFFFFFF;
-}
-
static int CondPassed(ARMul_State* cpu, unsigned int cond) {
const u32 NFLAG = cpu->NFlag;
const u32 ZFLAG = cpu->ZFlag;
@@ -3489,21 +3468,15 @@ enum {
FETCH_FAILURE
};
-static tdstate decode_thumb_instr(u32 inst, u32 addr, u32* arm_inst, u32* inst_size, ARM_INST_PTR* ptr_inst_base) {
+static ThumbDecodeStatus DecodeThumbInstruction(u32 inst, u32 addr, u32* arm_inst, u32* inst_size, ARM_INST_PTR* ptr_inst_base) {
// Check if in Thumb mode
- tdstate ret = thumb_translate (addr, inst, arm_inst, inst_size);
- if(ret == t_branch){
- // TODO: FIXME, endian should be judged
- u32 tinstr;
- if((addr & 0x3) != 0)
- tinstr = inst >> 16;
- else
- tinstr = inst & 0xFFFF;
-
+ ThumbDecodeStatus ret = TranslateThumbInstruction (addr, inst, arm_inst, inst_size);
+ if (ret == ThumbDecodeStatus::BRANCH) {
int inst_index;
int table_length = sizeof(arm_instruction_trans) / sizeof(transop_fp_t);
+ u32 tinstr = GetThumbInstruction(inst, addr);
- switch((tinstr & 0xF800) >> 11){
+ switch ((tinstr & 0xF800) >> 11) {
case 26:
case 27:
if (((tinstr & 0x0F00) != 0x0E00) && ((tinstr & 0x0F00) != 0x0F00)){
@@ -3536,7 +3509,7 @@ static tdstate decode_thumb_instr(u32 inst, u32 addr, u32* arm_inst, u32* inst_s
*ptr_inst_base = arm_instruction_trans[inst_index](tinstr, inst_index);
break;
default:
- ret = t_undefined;
+ ret = ThumbDecodeStatus::UNDEFINED;
break;
}
}
@@ -3548,10 +3521,6 @@ enum {
FETCH_EXCEPTION
};
-typedef struct instruction_set_encoding_item ISEITEM;
-
-extern const ISEITEM arm_instruction[];
-
static int InterpreterTranslate(ARMul_State* cpu, int& bb_start, u32 addr) {
Common::Profiling::ScopeTimer timer_decode(profile_decode);
@@ -3573,20 +3542,19 @@ static int InterpreterTranslate(ARMul_State* cpu, int& bb_start, u32 addr) {
inst = Memory::Read32(phys_addr & 0xFFFFFFFC);
size++;
- // If we are in thumb instruction, we will translate one thumb to one corresponding arm instruction
+ // If we are in Thumb mode, we'll translate one Thumb instruction to the corresponding ARM instruction
if (cpu->TFlag) {
uint32_t arm_inst;
- tdstate state = decode_thumb_instr(inst, phys_addr, &arm_inst, &inst_size, &inst_base);
+ ThumbDecodeStatus state = DecodeThumbInstruction(inst, phys_addr, &arm_inst, &inst_size, &inst_base);
- // We have translated the branch instruction of thumb in thumb decoder
- if(state == t_branch){
+ // We have translated the Thumb branch instruction in the Thumb decoder
+ if (state == ThumbDecodeStatus::BRANCH) {
goto translated;
}
inst = arm_inst;
}
- ret = decode_arm_instr(inst, &idx);
- if (ret == DECODE_FAILURE) {
+ if (DecodeARMInstruction(inst, &idx) == ARMDecodeStatus::FAILURE) {
std::string disasm = ARM_Disasm::Disassemble(phys_addr, inst);
LOG_ERROR(Core_ARM11, "Decode failure.\tPC : [0x%x]\tInstruction : %s [%x]", phys_addr, disasm.c_str(), inst);
LOG_ERROR(Core_ARM11, "cpsr=0x%x, cpu->TFlag=%d, r15=0x%x", cpu->Cpsr, cpu->TFlag, cpu->Reg[15]);
@@ -4174,9 +4142,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
CLREX_INST:
{
- remove_exclusive(cpu, 0);
- cpu->exclusive_state = 0;
-
+ cpu->UnsetExclusiveMemoryAddress();
cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(clrex_inst));
FETCH_INST;
@@ -4543,8 +4509,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int read_addr = RN;
- add_exclusive_addr(cpu, read_addr);
- cpu->exclusive_state = 1;
+ cpu->SetExclusiveMemoryAddress(read_addr);
RD = cpu->ReadMemory32(read_addr);
if (inst_cream->Rd == 15) {
@@ -4563,8 +4528,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int read_addr = RN;
- add_exclusive_addr(cpu, read_addr);
- cpu->exclusive_state = 1;
+ cpu->SetExclusiveMemoryAddress(read_addr);
RD = Memory::Read8(read_addr);
if (inst_cream->Rd == 15) {
@@ -4583,8 +4547,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int read_addr = RN;
- add_exclusive_addr(cpu, read_addr);
- cpu->exclusive_state = 1;
+ cpu->SetExclusiveMemoryAddress(read_addr);
RD = cpu->ReadMemory16(read_addr);
if (inst_cream->Rd == 15) {
@@ -4603,8 +4566,7 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int read_addr = RN;
- add_exclusive_addr(cpu, read_addr);
- cpu->exclusive_state = 1;
+ cpu->SetExclusiveMemoryAddress(read_addr);
RD = cpu->ReadMemory32(read_addr);
RD2 = cpu->ReadMemory32(read_addr + 4);
@@ -6089,10 +6051,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int write_addr = cpu->Reg[inst_cream->Rn];
- if ((exclusive_detect(cpu, write_addr) == 0) && (cpu->exclusive_state == 1)) {
- remove_exclusive(cpu, write_addr);
- cpu->exclusive_state = 0;
-
+ if (cpu->IsExclusiveMemoryAccess(write_addr)) {
+ cpu->UnsetExclusiveMemoryAddress();
cpu->WriteMemory32(write_addr, RM);
RD = 0;
} else {
@@ -6111,10 +6071,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int write_addr = cpu->Reg[inst_cream->Rn];
- if ((exclusive_detect(cpu, write_addr) == 0) && (cpu->exclusive_state == 1)) {
- remove_exclusive(cpu, write_addr);
- cpu->exclusive_state = 0;
-
+ if (cpu->IsExclusiveMemoryAccess(write_addr)) {
+ cpu->UnsetExclusiveMemoryAddress();
Memory::Write8(write_addr, cpu->Reg[inst_cream->Rm]);
RD = 0;
} else {
@@ -6133,9 +6091,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int write_addr = cpu->Reg[inst_cream->Rn];
- if ((exclusive_detect(cpu, write_addr) == 0) && (cpu->exclusive_state == 1)) {
- remove_exclusive(cpu, write_addr);
- cpu->exclusive_state = 0;
+ if (cpu->IsExclusiveMemoryAccess(write_addr)) {
+ cpu->UnsetExclusiveMemoryAddress();
const u32 rt = cpu->Reg[inst_cream->Rm + 0];
const u32 rt2 = cpu->Reg[inst_cream->Rm + 1];
@@ -6165,10 +6122,8 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
unsigned int write_addr = cpu->Reg[inst_cream->Rn];
- if ((exclusive_detect(cpu, write_addr) == 0) && (cpu->exclusive_state == 1)) {
- remove_exclusive(cpu, write_addr);
- cpu->exclusive_state = 0;
-
+ if (cpu->IsExclusiveMemoryAccess(write_addr)) {
+ cpu->UnsetExclusiveMemoryAddress();
cpu->WriteMemory16(write_addr, RM);
RD = 0;
} else {
diff --git a/src/core/arm/dyncom/arm_dyncom_thumb.cpp b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
index 2860af376..29272fd5d 100644
--- a/src/core/arm/dyncom/arm_dyncom_thumb.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
@@ -12,15 +12,9 @@
// with the following Thumb instruction held in the high 16-bits. Passing in two Thumb instructions
// allows easier simulation of the special dual BL instruction.
-tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
- tdstate valid = t_uninitialized;
- u32 tinstr = instr;
-
- // The endian should be judge here
- if((addr & 0x3) != 0)
- tinstr = instr >> 16;
- else
- tinstr &= 0xFFFF;
+ThumbDecodeStatus TranslateThumbInstruction(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
+ ThumbDecodeStatus valid = ThumbDecodeStatus::UNINITIALIZED;
+ u32 tinstr = GetThumbInstruction(instr, addr);
*ainstr = 0xDEADC0DE; // Debugging to catch non updates
@@ -357,21 +351,21 @@ tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
else
*ainstr |= (tinstr & 0x00FF);
} else if ((tinstr & 0x0F00) != 0x0E00)
- valid = t_branch;
+ valid = ThumbDecodeStatus::BRANCH;
else // UNDEFINED : cc=1110(AL) uses different format
- valid = t_undefined;
+ valid = ThumbDecodeStatus::UNDEFINED;
break;
case 28: // B
- valid = t_branch;
+ valid = ThumbDecodeStatus::BRANCH;
break;
case 29:
- if(tinstr & 0x1)
- valid = t_undefined;
+ if (tinstr & 0x1)
+ valid = ThumbDecodeStatus::UNDEFINED;
else
- valid = t_branch;
+ valid = ThumbDecodeStatus::BRANCH;
break;
case 30: // BL instruction 1
@@ -380,7 +374,7 @@ tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
// simulation simple (from the user perspective) we check if the following instruction is
// the second half of this BL, and if it is we simulate it immediately
- valid = t_branch;
+ valid = ThumbDecodeStatus::BRANCH;
break;
case 31: // BL instruction 2
@@ -389,7 +383,7 @@ tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
// ever be matched with the fmt19 "BL instruction 1" instruction. However, we do allow the
// simulation of it on its own, with undefined results if r14 is not suitably initialised.
- valid = t_branch;
+ valid = ThumbDecodeStatus::BRANCH;
break;
}
diff --git a/src/core/arm/dyncom/arm_dyncom_thumb.h b/src/core/arm/dyncom/arm_dyncom_thumb.h
index c06f09580..447974363 100644
--- a/src/core/arm/dyncom/arm_dyncom_thumb.h
+++ b/src/core/arm/dyncom/arm_dyncom_thumb.h
@@ -28,20 +28,22 @@
#include "common/common_types.h"
-enum tdstate {
- t_undefined, // Undefined Thumb instruction
- t_decoded, // Instruction decoded to ARM equivalent
- t_branch, // Thumb branch (already processed)
- t_uninitialized,
+enum class ThumbDecodeStatus {
+ UNDEFINED, // Undefined Thumb instruction
+ DECODED, // Instruction decoded to ARM equivalent
+ BRANCH, // Thumb branch (already processed)
+ UNINITIALIZED,
};
-tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size);
+// Translates a Thumb mode instruction into its ARM equivalent.
+ThumbDecodeStatus TranslateThumbInstruction(u32 addr, u32 instr, u32* ainstr, u32* inst_size);
-static inline u32 get_thumb_instr(u32 instr, u32 pc) {
- u32 tinstr;
- if ((pc & 0x3) != 0)
- tinstr = instr >> 16;
- else
- tinstr = instr & 0xFFFF;
- return tinstr;
+static inline u32 GetThumbInstruction(u32 instr, u32 address) {
+ // Normally you would need to handle instruction endianness,
+ // however, it is fixed to little-endian on the MPCore, so
+ // there's no need to check for this beforehand.
+ if ((address & 0x3) != 0)
+ return instr >> 16;
+
+ return instr & 0xFFFF;
}
diff --git a/src/core/arm/skyeye_common/armstate.h b/src/core/arm/skyeye_common/armstate.h
index 88c1dab9d..b364e2621 100644
--- a/src/core/arm/skyeye_common/armstate.h
+++ b/src/core/arm/skyeye_common/armstate.h
@@ -163,6 +163,19 @@ public:
u32 ReadCP15Register(u32 crn, u32 opcode_1, u32 crm, u32 opcode_2) const;
void WriteCP15Register(u32 value, u32 crn, u32 opcode_1, u32 crm, u32 opcode_2);
+ // Exclusive memory access functions
+ bool IsExclusiveMemoryAccess(u32 address) const {
+ return exclusive_state && exclusive_tag == (address & RESERVATION_GRANULE_MASK);
+ }
+ void SetExclusiveMemoryAddress(u32 address) {
+ exclusive_tag = address & RESERVATION_GRANULE_MASK;
+ exclusive_state = true;
+ }
+ void UnsetExclusiveMemoryAddress() {
+ exclusive_tag = 0xFFFFFFFF;
+ exclusive_state = false;
+ }
+
// Whether or not the given CPU is in big endian mode (E bit is set)
bool InBigEndianMode() const {
return (Cpsr & (1 << 9)) != 0;
@@ -203,9 +216,6 @@ public:
u32 Mode; // The current mode
u32 Bank; // The current register bank
- u32 exclusive_tag; // The address for which the local monitor is in exclusive access mode
- u32 exclusive_state;
- u32 exclusive_result;
u32 NFlag, ZFlag, CFlag, VFlag, IFFlags; // Dummy flags for speed
unsigned int shifter_carry_out;
@@ -230,4 +240,13 @@ public:
private:
void ResetMPCoreCP15Registers();
+
+ // Defines a reservation granule of 2 words, which protects the first 2 words starting at the tag.
+ // This is the smallest granule allowed by the v7 spec, and is coincidentally just large enough to
+ // support LDR/STREXD.
+ static const u32 RESERVATION_GRANULE_MASK = 0xFFFFFFF8;
+
+ u32 exclusive_tag; // The address for which the local monitor is in exclusive access mode
+ u32 exclusive_result;
+ bool exclusive_state;
};
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 12:14:42 +0000