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/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <array>
#include <sstream>
#include <iomanip>
#include "pio_disassembler.h"
extern "C" void disassemble(char *buf, int buf_len, uint inst, uint sideset_bits, bool sideset_opt) {
if (buf_len) buf[disassemble(inst, sideset_bits, sideset_opt).copy(buf, buf_len - 1)] = 0;
}
std::string disassemble(uint inst, uint sideset_bits_including_opt, bool sideset_opt) {
std::stringstream ss;
uint major = (inst >> 13u) & 0x7;
uint arg1 = ((uint) inst >> 5u) & 0x7u;
uint arg2 = (inst & 0x1fu) | ((inst & 0x10000) >> 11);
auto op = [&](const std::string &s) {
ss << std::left << std::setw(7) << s;
};
auto op_guts = [&](const std::string &s) {
ss << std::left << std::setw(16) << s;
};
bool invalid = false;
switch (major) {
case 0b000: {
static std::array<std::string, 8> conditions{"", "!x, ", "x--, ", "!y, ", "y--, ", "x != y, ", "pin, ",
"!osre, "};
op("jmp");
op_guts(conditions[arg1] + std::to_string(arg2));
break;
}
case 0b001: {
uint source = arg1 & 3u;
std::string guts;
switch (source) {
case 0b00:
guts = "gpio, " + std::to_string(arg2);
break;
case 0b01:
guts = "pin, " + std::to_string(arg2);
break;
case 0b10:
guts = "irq";
if (arg2 & 0x08) {
guts += arg2 & 0x10 ? " next" : " prev";
}
guts += ", " + std::to_string(arg2 & 7u);
if (0x10 == (arg2 & 0x18)) guts += " rel";
break;
case 0b11:
if (arg2 & 0x1cu) {
invalid = true;
} else if (arg2) {
guts = "jmppin + " + std::to_string(arg2 & 3u);
} else {
guts = "jmppin";
}
break;
}
if (!invalid) {
guts = ((arg1 & 4u) ? "1 " : "0 ") + guts;
op("wait");
op_guts(guts);
}
break;
}
case 0b010: {
static std::array<std::string, 8> sources { "pins", "x", "y", "null", "", "status", "isr", "osr"};
std::string source = sources[arg1];
if (source.empty()) {
invalid = true;
} else {
op("in");
op_guts(source + ", " + std::to_string(arg2 ? arg2 : 32));
}
break;
}
case 0b011: {
static std::array<std::string, 8> dests { "pins", "x", "y", "null", "pindirs", "pc", "isr", "exec"};
op("out");
op_guts(dests[arg1] + ", " + std::to_string(arg2 ? arg2 : 32));
break;
}
case 0b100: {
if (arg2) {
if ((arg1 & 3) || !(arg2 & 0x10)) {
invalid = true;
} else {
std::string index;
if (arg2 & 8) index = std::to_string(arg2 & 3);
else index = "y";
std::string guts = "";
op("mov");
if (arg1 & 4) {
guts = "osr, rxfifo[" + index + "]";
} else {
guts = "rxfifo[" + index + "], isr";
}
op_guts(guts);
}
} else {
std::string guts = "";
if (arg1 & 4u) {
op("pull");
if (arg1 & 2u) guts = "ifempty ";
} else {
op("push");
if (arg1 & 2u) guts = "iffull ";
}
guts += (arg1 & 0x1u) ? "block" : "noblock";
op_guts(guts);
}
break;
}
case 0b101: {
static std::array<std::string, 8> dests { "pins", "x", "y", "pindirs", "exec", "pc", "isr", "osr"};
static std::array<std::string, 8> sources { "pins", "x", "y", "null", "", "status", "isr", "osr"};
std::string dest = dests[arg1];
std::string source = sources[arg2 & 7u];
uint operation = arg2 >> 3u;
if (source.empty() || dest.empty() || operation == 3) {
invalid = true;
}
if (dest == source && !operation && (arg1 == 1 || arg2 == 2)) {
op("nop");
op_guts("");
} else {
op("mov");
std::string guts = dest + ", ";
if (operation == 1) {
guts += "~";
} else if (operation == 2) {
guts += "::";
}
guts += source;
op_guts(guts);
}
break;
}
case 0b110: {
if ((arg1 & 0x4u)) {
invalid = true;
} else {
op("irq");
std::string guts;
if (arg1 & 0x2u) {
guts += "clear ";
} else if (arg1 & 0x1u) {
guts += "wait ";
} else {
guts += "nowait ";
}
guts += std::to_string(arg2 & 7u);
switch(arg2 & 0x18) {
case 0x10:
guts += " rel";
break;
case 0x08:
guts = "prev "+guts;
break;
case 0x18:
guts = "next "+guts;
break;
}
op_guts(guts);
}
break;
}
case 0b111: {
static std::array<std::string, 8> dests{"pins", "x", "y", "", "pindirs", "", "", ""};
std::string dest = dests[arg1];
if (dest.empty()) {
invalid = true;
} else {
op("set");
op_guts(dests[arg1] + ", " + std::to_string(arg2));
}
break;
}
}
if (invalid) {
return "reserved";
}
uint delay = ((uint) inst >> 8u) & 0x1f;
ss << std::left << std::setw(7);
if (sideset_bits_including_opt && (!sideset_opt || (delay & 0x10u))) {
ss << ("side "+ std::to_string((delay & (sideset_opt ? 0xfu : 0x1fu)) >> (5u - sideset_bits_including_opt)));
} else {
ss << "";
}
delay &= ((1u << (5 - sideset_bits_including_opt)) - 1u);
ss << std::left << std::setw(4) << (delay ? ("[" + std::to_string(delay) + "]") : "");
// remove trailing spaces
auto str = ss.str();
str.erase(str.find_last_not_of(' ')+1);
return str;
}
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