1047 lines
43 KiB
C++
1047 lines
43 KiB
C++
/*******************************************************************************
|
|
* Copyright (C) 2021 MINRES Technologies GmbH
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the copyright holder nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Contributors:
|
|
* eyck@minres.com - initial implementation
|
|
******************************************************************************/
|
|
|
|
#ifndef _RISCV_HART_MU_P_H
|
|
#define _RISCV_HART_MU_P_H
|
|
|
|
#include "riscv_hart_common.h"
|
|
#include "iss/arch/traits.h"
|
|
#include "iss/instrumentation_if.h"
|
|
#include "iss/log_categories.h"
|
|
#include "iss/vm_if.h"
|
|
#ifndef FMT_HEADER_ONLY
|
|
#define FMT_HEADER_ONLY
|
|
#endif
|
|
#include <array>
|
|
#include <elfio/elfio.hpp>
|
|
#include <fmt/format.h>
|
|
#include <iomanip>
|
|
#include <sstream>
|
|
#include <type_traits>
|
|
#include <unordered_map>
|
|
#include <functional>
|
|
#include <util/bit_field.h>
|
|
#include <util/ities.h>
|
|
#include <util/sparse_array.h>
|
|
|
|
#if defined(__GNUC__)
|
|
#define likely(x) __builtin_expect(!!(x), 1)
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
|
#else
|
|
#define likely(x) x
|
|
#define unlikely(x) x
|
|
#endif
|
|
|
|
namespace iss {
|
|
namespace arch {
|
|
|
|
enum features_e{FEAT_NONE, FEAT_PMP, FEAT_EXT_N, FEAT_CLIC};
|
|
|
|
template <typename BASE, features_e FEAT=FEAT_NONE> class riscv_hart_mu_p : public BASE {
|
|
protected:
|
|
const std::array<const char, 4> lvl = {{'U', 'S', 'H', 'M'}};
|
|
const std::array<const char *, 16> trap_str = {{""
|
|
"Instruction address misaligned", // 0
|
|
"Instruction access fault", // 1
|
|
"Illegal instruction", // 2
|
|
"Breakpoint", // 3
|
|
"Load address misaligned", // 4
|
|
"Load access fault", // 5
|
|
"Store/AMO address misaligned", // 6
|
|
"Store/AMO access fault", // 7
|
|
"Environment call from U-mode", // 8
|
|
"Environment call from S-mode", // 9
|
|
"Reserved", // a
|
|
"Environment call from M-mode", // b
|
|
"Instruction page fault", // c
|
|
"Load page fault", // d
|
|
"Reserved", // e
|
|
"Store/AMO page fault"}};
|
|
const std::array<const char *, 12> irq_str = {
|
|
{"User software interrupt", "Supervisor software interrupt", "Reserved", "Machine software interrupt",
|
|
"User timer interrupt", "Supervisor timer interrupt", "Reserved", "Machine timer interrupt",
|
|
"User external interrupt", "Supervisor external interrupt", "Reserved", "Machine external interrupt"}};
|
|
public:
|
|
using core = BASE;
|
|
using this_class = riscv_hart_mu_p<BASE, FEAT>;
|
|
using phys_addr_t = typename core::phys_addr_t;
|
|
using reg_t = typename core::reg_t;
|
|
using addr_t = typename core::addr_t;
|
|
|
|
using rd_csr_f = iss::status (this_class::*)(unsigned addr, reg_t &);
|
|
using wr_csr_f = iss::status (this_class::*)(unsigned addr, reg_t);
|
|
|
|
// primary template
|
|
template <class T, class Enable = void> struct hart_state {};
|
|
// specialization 32bit
|
|
template <typename T> class hart_state<T, typename std::enable_if<std::is_same<T, uint32_t>::value>::type> {
|
|
public:
|
|
BEGIN_BF_DECL(mstatus_t, T);
|
|
// SD bit is read-only and is set when either the FS or XS bits encode a Dirty state (i.e., SD=((FS==11) OR XS==11)))
|
|
BF_FIELD(SD, 31, 1);
|
|
// Trap SRET
|
|
BF_FIELD(TSR, 22, 1);
|
|
// Timeout Wait
|
|
BF_FIELD(TW, 21, 1);
|
|
// Trap Virtual Memory
|
|
BF_FIELD(TVM, 20, 1);
|
|
// Make eXecutable Readable
|
|
BF_FIELD(MXR, 19, 1);
|
|
// permit Supervisor User Memory access
|
|
BF_FIELD(SUM, 18, 1);
|
|
// Modify PRiVilege
|
|
BF_FIELD(MPRV, 17, 1);
|
|
// status of additional user-mode extensions and associated state, All off/None dirty or clean, some on/None dirty, some clean/Some dirty
|
|
BF_FIELD(XS, 15, 2);
|
|
// floating-point unit status Off/Initial/Clean/Dirty
|
|
BF_FIELD(FS, 13, 2);
|
|
// machine previous privilege
|
|
BF_FIELD(MPP, 11, 2);
|
|
// supervisor previous privilege
|
|
BF_FIELD(SPP, 8, 1);
|
|
// previous machine interrupt-enable
|
|
BF_FIELD(MPIE, 7, 1);
|
|
// previous supervisor interrupt-enable
|
|
BF_FIELD(SPIE, 5, 1);
|
|
// previous user interrupt-enable
|
|
BF_FIELD(UPIE, 4, 1);
|
|
// machine interrupt-enable
|
|
BF_FIELD(MIE, 3, 1);
|
|
// supervisor interrupt-enable
|
|
BF_FIELD(SIE, 1, 1);
|
|
// user interrupt-enable
|
|
BF_FIELD(UIE, 0, 1);
|
|
END_BF_DECL();
|
|
|
|
mstatus_t mstatus;
|
|
|
|
static const reg_t mstatus_reset_val = 0;
|
|
|
|
void write_mstatus(T val, unsigned priv_lvl) {
|
|
auto mask = get_mask(priv_lvl);
|
|
auto new_val = (mstatus.backing.val & ~mask) | (val & mask);
|
|
mstatus = new_val;
|
|
}
|
|
|
|
static constexpr uint32_t get_mask(unsigned priv_lvl) {
|
|
#if __cplusplus < 201402L
|
|
return priv_lvl == PRIV_U ? 0x80000011UL : priv_lvl == PRIV_S ? 0x800de133UL : 0x807ff9ddUL;
|
|
#else
|
|
switch (priv_lvl) {
|
|
case PRIV_U: return 0x00000011UL; // 0b1000 0000 0000 0000 0000 0000 0001 0001
|
|
default:
|
|
// +-SD
|
|
// | +-TSR
|
|
// | |+-TW
|
|
// | ||+-TVM
|
|
// | |||+-MXR
|
|
// | ||||+-SUM
|
|
// | |||||+-MPRV
|
|
// | |||||| +-XS
|
|
// | |||||| | +-FS
|
|
// | |||||| | | +-MPP
|
|
// | |||||| | | | +-SPP
|
|
// | |||||| | | | |+-MPIE
|
|
// | |||||| | | | || +-UPIE
|
|
// | ||||||/|/|/| || |+-MIE
|
|
// | ||||||/|/|/| || || +-UIE
|
|
return 0b00000000000000000001100010011001;
|
|
}
|
|
#endif
|
|
}
|
|
};
|
|
using hart_state_type = hart_state<reg_t>;
|
|
|
|
constexpr reg_t get_irq_mask(size_t mode) {
|
|
std::array<const reg_t, 4> m = {{
|
|
0b000100010001, // U mode
|
|
0, // S mode
|
|
0,
|
|
0b100110011001 // M mode
|
|
}};
|
|
return m[mode];
|
|
}
|
|
|
|
constexpr reg_t get_pc_mask() {
|
|
return traits<BASE>::MISA_VAL&0b0100?~1:~3;
|
|
}
|
|
|
|
riscv_hart_mu_p();
|
|
virtual ~riscv_hart_mu_p() = default;
|
|
|
|
void reset(uint64_t address) override;
|
|
|
|
std::pair<uint64_t, bool> load_file(std::string name, int type = -1) override;
|
|
|
|
iss::status read(const address_type type, const access_type access, const uint32_t space,
|
|
const uint64_t addr, const unsigned length, uint8_t *const data) override;
|
|
iss::status write(const address_type type, const access_type access, const uint32_t space,
|
|
const uint64_t addr, const unsigned length, const uint8_t *const data) override;
|
|
|
|
virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_mu_p::enter_trap(flags, fault_data, fault_data); }
|
|
virtual uint64_t enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) override;
|
|
virtual uint64_t leave_trap(uint64_t flags) override;
|
|
|
|
const reg_t& get_mhartid() const { return mhartid_reg; }
|
|
void set_mhartid(reg_t mhartid) { mhartid_reg = mhartid; };
|
|
|
|
void disass_output(uint64_t pc, const std::string instr) override {
|
|
CLOG(INFO, disass) << fmt::format("0x{:016x} {:40} [p:{};s:0x{:x};c:{}]",
|
|
pc, instr, lvl[this->reg.PRIV], (reg_t)state.mstatus, this->reg.icount);
|
|
};
|
|
|
|
iss::instrumentation_if *get_instrumentation_if() override { return &instr_if; }
|
|
|
|
void setMemReadCb(std::function<iss::status(phys_addr_t, unsigned, uint8_t* const)> const& memReadCb) {
|
|
mem_read_cb = memReadCb;
|
|
}
|
|
|
|
void setMemWriteCb(std::function<iss::status(phys_addr_t, unsigned, const uint8_t* const)> const& memWriteCb) {
|
|
mem_write_cb = memWriteCb;
|
|
}
|
|
|
|
void set_csr(unsigned addr, reg_t val){
|
|
csr[addr & csr.page_addr_mask] = val;
|
|
}
|
|
|
|
protected:
|
|
struct riscv_instrumentation_if : public iss::instrumentation_if {
|
|
|
|
riscv_instrumentation_if(riscv_hart_mu_p<BASE, FEAT> &arch)
|
|
: arch(arch) {}
|
|
/**
|
|
* get the name of this architecture
|
|
*
|
|
* @return the name of this architecture
|
|
*/
|
|
const std::string core_type_name() const override { return traits<BASE>::core_type; }
|
|
|
|
virtual uint64_t get_pc() { return arch.get_pc(); };
|
|
|
|
virtual uint64_t get_next_pc() { return arch.get_next_pc(); };
|
|
|
|
virtual void set_curr_instr_cycles(unsigned cycles) { arch.cycle_offset += cycles - 1; };
|
|
|
|
riscv_hart_mu_p<BASE, FEAT> &arch;
|
|
};
|
|
|
|
friend struct riscv_instrumentation_if;
|
|
addr_t get_pc() { return this->reg.PC; }
|
|
addr_t get_next_pc() { return this->reg.NEXT_PC; }
|
|
|
|
virtual iss::status read_mem(phys_addr_t addr, unsigned length, uint8_t *const data);
|
|
virtual iss::status write_mem(phys_addr_t addr, unsigned length, const uint8_t *const data);
|
|
|
|
virtual iss::status read_csr(unsigned addr, reg_t &val);
|
|
virtual iss::status write_csr(unsigned addr, reg_t val);
|
|
|
|
hart_state_type state;
|
|
int64_t cycle_offset{0};
|
|
uint64_t mcycle_csr{0};
|
|
int64_t instret_offset{0};
|
|
uint64_t minstret_csr{0};
|
|
reg_t fault_data;
|
|
uint64_t tohost = tohost_dflt;
|
|
uint64_t fromhost = fromhost_dflt;
|
|
unsigned to_host_wr_cnt = 0;
|
|
riscv_instrumentation_if instr_if;
|
|
|
|
using mem_type = util::sparse_array<uint8_t, 1ULL << 32>;
|
|
using csr_type = util::sparse_array<typename traits<BASE>::reg_t, 1ULL << 12, 12>;
|
|
using csr_page_type = typename csr_type::page_type;
|
|
mem_type mem;
|
|
csr_type csr;
|
|
std::stringstream uart_buf;
|
|
std::unordered_map<reg_t, uint64_t> ptw;
|
|
std::unordered_map<uint64_t, uint8_t> atomic_reservation;
|
|
std::unordered_map<unsigned, rd_csr_f> csr_rd_cb;
|
|
std::unordered_map<unsigned, wr_csr_f> csr_wr_cb;
|
|
|
|
private:
|
|
iss::status read_reg(unsigned addr, reg_t &val);
|
|
iss::status write_reg(unsigned addr, reg_t val);
|
|
iss::status read_null(unsigned addr, reg_t &val);
|
|
iss::status write_null(unsigned addr, reg_t val){return iss::status::Ok;}
|
|
iss::status read_cycle(unsigned addr, reg_t &val);
|
|
iss::status write_cycle(unsigned addr, reg_t val);
|
|
iss::status read_instret(unsigned addr, reg_t &val);
|
|
iss::status write_instret(unsigned addr, reg_t val);
|
|
iss::status read_mtvec(unsigned addr, reg_t &val);
|
|
iss::status read_time(unsigned addr, reg_t &val);
|
|
iss::status read_status(unsigned addr, reg_t &val);
|
|
iss::status write_status(unsigned addr, reg_t val);
|
|
iss::status read_ie(unsigned addr, reg_t &val);
|
|
iss::status write_ie(unsigned addr, reg_t val);
|
|
iss::status read_ip(unsigned addr, reg_t &val);
|
|
iss::status write_ip(unsigned addr, reg_t val);
|
|
iss::status read_hartid(unsigned addr, reg_t &val);
|
|
iss::status write_mepc(unsigned addr, reg_t val);
|
|
|
|
reg_t mhartid_reg{0x0};
|
|
std::function<iss::status(phys_addr_t, unsigned, uint8_t *const)>mem_read_cb;
|
|
std::function<iss::status(phys_addr_t, unsigned, const uint8_t *const)> mem_write_cb;
|
|
|
|
protected:
|
|
void check_interrupt();
|
|
};
|
|
|
|
template <typename BASE, features_e FEAT>
|
|
riscv_hart_mu_p<BASE, FEAT>::riscv_hart_mu_p()
|
|
: state()
|
|
, instr_if(*this) {
|
|
// reset values
|
|
csr[misa] = traits<BASE>::MISA_VAL;
|
|
csr[mvendorid] = 0x669;
|
|
csr[marchid] = 0x80000003;
|
|
csr[mimpid] = 1;
|
|
|
|
uart_buf.str("");
|
|
for (unsigned addr = mhpmcounter3; addr <= mhpmcounter31; ++addr){
|
|
csr_rd_cb[addr] = &this_class::read_null;
|
|
csr_wr_cb[addr] = &this_class::write_reg;
|
|
}
|
|
for (unsigned addr = mhpmcounter3h; addr <= mhpmcounter31h; ++addr){
|
|
csr_rd_cb[addr] = &this_class::read_null;
|
|
csr_wr_cb[addr] = &this_class::write_reg;
|
|
}
|
|
for (unsigned addr = mhpmevent3; addr <= mhpmevent31; ++addr){
|
|
csr_rd_cb[addr] = &this_class::read_null;
|
|
csr_wr_cb[addr] = &this_class::write_reg;
|
|
}
|
|
for (unsigned addr = hpmcounter3; addr <= hpmcounter31; ++addr){
|
|
csr_rd_cb[addr] = &this_class::read_null;
|
|
}
|
|
for (unsigned addr = hpmcounter3h; addr <= hpmcounter31h; ++addr){
|
|
csr_rd_cb[addr] = &this_class::read_null;
|
|
//csr_wr_cb[addr] = &this_class::write_reg;
|
|
}
|
|
// common regs
|
|
const std::array<unsigned, 10> addrs{{misa, mvendorid, marchid, mimpid, mepc, mtvec, mscratch, mcause, mtval, mscratch}};
|
|
for(auto addr: addrs) {
|
|
csr_rd_cb[addr] = &this_class::read_reg;
|
|
csr_wr_cb[addr] = &this_class::write_reg;
|
|
}
|
|
// special handling & overrides
|
|
csr_rd_cb[time] = &this_class::read_time;
|
|
csr_rd_cb[timeh] = &this_class::read_time;
|
|
csr_rd_cb[cycle] = &this_class::read_cycle;
|
|
csr_rd_cb[cycleh] = &this_class::read_cycle;
|
|
csr_rd_cb[instret] = &this_class::read_instret;
|
|
csr_rd_cb[instreth] = &this_class::read_instret;
|
|
|
|
csr_rd_cb[mcycle] = &this_class::read_cycle;
|
|
csr_wr_cb[mcycle] = &this_class::write_cycle;
|
|
csr_rd_cb[mcycleh] = &this_class::read_cycle;
|
|
csr_wr_cb[mcycleh] = &this_class::write_cycle;
|
|
csr_rd_cb[minstret] = &this_class::read_instret;
|
|
csr_wr_cb[minstret] = &this_class::write_instret;
|
|
csr_rd_cb[minstreth] = &this_class::read_instret;
|
|
csr_wr_cb[minstreth] = &this_class::write_instret;
|
|
csr_rd_cb[mstatus] = &this_class::read_status;
|
|
csr_wr_cb[mstatus] = &this_class::write_status;
|
|
csr_rd_cb[ustatus] = &this_class::read_status;
|
|
csr_wr_cb[ustatus] = &this_class::write_status;
|
|
csr_rd_cb[mip] = &this_class::read_ip;
|
|
csr_wr_cb[mip] = &this_class::write_ip;
|
|
csr_rd_cb[uip] = &this_class::read_ip;
|
|
csr_wr_cb[uip] = &this_class::write_ip;
|
|
csr_rd_cb[mie] = &this_class::read_ie;
|
|
csr_wr_cb[mie] = &this_class::write_ie;
|
|
csr_rd_cb[uie] = &this_class::read_ie;
|
|
csr_wr_cb[uie] = &this_class::write_ie;
|
|
csr_rd_cb[mhartid] = &this_class::read_hartid;
|
|
csr_rd_cb[mcounteren] = &this_class::read_null;
|
|
csr_wr_cb[mcounteren] = &this_class::write_null;
|
|
csr_rd_cb[mtvec] = &this_class::read_mtvec;
|
|
csr_wr_cb[mepc] = &this_class::write_mepc;
|
|
csr_wr_cb[misa] = &this_class::write_null;
|
|
csr_wr_cb[mvendorid] = &this_class::write_null;
|
|
csr_wr_cb[marchid] = &this_class::write_null;
|
|
csr_wr_cb[mimpid] = &this_class::write_null;
|
|
|
|
if(FEAT & FEAT_PMP){
|
|
for(size_t i=pmpaddr0; i<=pmpaddr15; ++i){
|
|
csr_rd_cb[i] = &this_class::read_reg;
|
|
csr_wr_cb[i] = &this_class::write_reg;
|
|
}
|
|
for(size_t i=pmpcfg0; i<=pmpcfg3; ++i){
|
|
csr_rd_cb[i] = &this_class::read_reg;
|
|
csr_wr_cb[i] = &this_class::write_reg;
|
|
}
|
|
}
|
|
if(FEAT & FEAT_EXT_N){
|
|
csr_rd_cb[mideleg] = &this_class::read_reg;
|
|
csr_wr_cb[mideleg] = &this_class::write_reg;
|
|
csr_rd_cb[medeleg] = &this_class::read_reg;
|
|
csr_wr_cb[medeleg] = &this_class::write_reg;
|
|
}
|
|
if(FEAT & FEAT_CLIC) {
|
|
csr_rd_cb[mtvt] = &this_class::read_reg;
|
|
csr_wr_cb[mtvt] = &this_class::write_reg;
|
|
csr_rd_cb[mxnti] = &this_class::read_reg;
|
|
csr_wr_cb[mxnti] = &this_class::write_reg;
|
|
csr_rd_cb[mintstatus] = &this_class::read_reg;
|
|
csr_wr_cb[mintstatus] = &this_class::write_reg;
|
|
csr_rd_cb[mscratchcsw] = &this_class::read_reg;
|
|
csr_wr_cb[mscratchcsw] = &this_class::write_reg;
|
|
csr_rd_cb[mscratchcswl] = &this_class::read_reg;
|
|
csr_wr_cb[mscratchcswl] = &this_class::write_reg;
|
|
csr_rd_cb[mintthresh] = &this_class::read_reg;
|
|
csr_wr_cb[mintthresh] = &this_class::write_reg;
|
|
csr_rd_cb[mclicbase] = &this_class::read_reg;
|
|
csr_wr_cb[mclicbase] = &this_class::write_reg;
|
|
}
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> std::pair<uint64_t, bool> riscv_hart_mu_p<BASE, FEAT>::load_file(std::string name, int type) {
|
|
FILE *fp = fopen(name.c_str(), "r");
|
|
if (fp) {
|
|
std::array<char, 5> buf;
|
|
auto n = fread(buf.data(), 1, 4, fp);
|
|
if (n != 4) throw std::runtime_error("input file has insufficient size");
|
|
buf[4] = 0;
|
|
if (strcmp(buf.data() + 1, "ELF") == 0) {
|
|
fclose(fp);
|
|
// Create elfio reader
|
|
ELFIO::elfio reader;
|
|
// Load ELF data
|
|
if (!reader.load(name)) throw std::runtime_error("could not process elf file");
|
|
// check elf properties
|
|
if (reader.get_class() != ELFCLASS32)
|
|
if (sizeof(reg_t) == 4) throw std::runtime_error("wrong elf class in file");
|
|
if (reader.get_type() != ET_EXEC) throw std::runtime_error("wrong elf type in file");
|
|
if (reader.get_machine() != EM_RISCV) throw std::runtime_error("wrong elf machine in file");
|
|
for (const auto pseg : reader.segments) {
|
|
const auto fsize = pseg->get_file_size(); // 0x42c/0x0
|
|
const auto seg_data = pseg->get_data();
|
|
if (fsize > 0) {
|
|
auto res = this->write(iss::address_type::PHYSICAL, iss::access_type::DEBUG_WRITE,
|
|
traits<BASE>::MEM, pseg->get_physical_address(),
|
|
fsize, reinterpret_cast<const uint8_t *const>(seg_data));
|
|
if (res != iss::Ok)
|
|
LOG(ERROR) << "problem writing " << fsize << "bytes to 0x" << std::hex
|
|
<< pseg->get_physical_address();
|
|
}
|
|
}
|
|
for (const auto sec : reader.sections) {
|
|
if (sec->get_name() == ".tohost") {
|
|
tohost = sec->get_address();
|
|
fromhost = tohost + 0x40;
|
|
}
|
|
}
|
|
|
|
return std::make_pair(reader.get_entry(), true);
|
|
}
|
|
throw std::runtime_error("memory load file is not a valid elf file");
|
|
}
|
|
throw std::runtime_error("memory load file not found");
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT>
|
|
iss::status riscv_hart_mu_p<BASE, FEAT>::read(const address_type type, const access_type access, const uint32_t space,
|
|
const uint64_t addr, const unsigned length, uint8_t *const data) {
|
|
#ifndef NDEBUG
|
|
if (access && iss::access_type::DEBUG) {
|
|
LOG(TRACEALL) << "debug read of " << length << " bytes @addr 0x" << std::hex << addr;
|
|
} else if(access && iss::access_type::FETCH){
|
|
LOG(TRACEALL) << "fetch of " << length << " bytes @addr 0x" << std::hex << addr;
|
|
} else {
|
|
LOG(TRACE) << "read of " << length << " bytes @addr 0x" << std::hex << addr;
|
|
}
|
|
#endif
|
|
try {
|
|
switch (space) {
|
|
case traits<BASE>::MEM: {
|
|
if (unlikely((access == iss::access_type::FETCH || access == iss::access_type::DEBUG_FETCH) && (addr & 0x1) == 1)) {
|
|
fault_data = addr;
|
|
if (access && iss::access_type::DEBUG) throw trap_access(0, addr);
|
|
this->reg.trap_state = (1 << 31); // issue trap 0
|
|
return iss::Err;
|
|
}
|
|
try {
|
|
auto alignment = access == iss::access_type::FETCH? (traits<BASE>::MISA_VAL&0x100? 2 : 4) : length;
|
|
if(alignment>1 && (addr&(alignment-1))){
|
|
this->reg.trap_state = 1<<31 | 4<<16;
|
|
fault_data=addr;
|
|
return iss::Err;
|
|
}
|
|
auto res = type==iss::address_type::PHYSICAL?
|
|
read_mem( BASE::v2p(phys_addr_t{access, space, addr}), length, data):
|
|
read_mem( BASE::v2p(iss::addr_t{access, type, space, addr}), length, data);
|
|
if (unlikely(res != iss::Ok)){
|
|
this->reg.trap_state = (1 << 31) | (5 << 16); // issue trap 5 (load access fault
|
|
fault_data=addr;
|
|
}
|
|
return res;
|
|
} catch (trap_access &ta) {
|
|
this->reg.trap_state = (1 << 31) | ta.id;
|
|
fault_data=ta.addr;
|
|
return iss::Err;
|
|
}
|
|
} break;
|
|
case traits<BASE>::CSR: {
|
|
if (length != sizeof(reg_t)) return iss::Err;
|
|
return read_csr(addr, *reinterpret_cast<reg_t *const>(data));
|
|
} break;
|
|
case traits<BASE>::FENCE: {
|
|
if ((addr + length) > mem.size()) return iss::Err;
|
|
return iss::Ok;
|
|
} break;
|
|
case traits<BASE>::RES: {
|
|
auto it = atomic_reservation.find(addr);
|
|
if (it != atomic_reservation.end() && it->second != 0) {
|
|
memset(data, 0xff, length);
|
|
atomic_reservation.erase(addr);
|
|
} else
|
|
memset(data, 0, length);
|
|
} break;
|
|
default:
|
|
return iss::Err; // assert("Not supported");
|
|
}
|
|
return iss::Ok;
|
|
} catch (trap_access &ta) {
|
|
this->reg.trap_state = (1 << 31) | ta.id;
|
|
fault_data=ta.addr;
|
|
return iss::Err;
|
|
}
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT>
|
|
iss::status riscv_hart_mu_p<BASE, FEAT>::write(const address_type type, const access_type access, const uint32_t space,
|
|
const uint64_t addr, const unsigned length, const uint8_t *const data) {
|
|
#ifndef NDEBUG
|
|
const char *prefix = (access && iss::access_type::DEBUG) ? "debug " : "";
|
|
switch (length) {
|
|
case 8:
|
|
LOG(TRACE) << prefix << "write of " << length << " bytes (0x" << std::hex << *(uint64_t *)&data[0] << std::dec
|
|
<< ") @addr 0x" << std::hex << addr;
|
|
break;
|
|
case 4:
|
|
LOG(TRACE) << prefix << "write of " << length << " bytes (0x" << std::hex << *(uint32_t *)&data[0] << std::dec
|
|
<< ") @addr 0x" << std::hex << addr;
|
|
break;
|
|
case 2:
|
|
LOG(TRACE) << prefix << "write of " << length << " bytes (0x" << std::hex << *(uint16_t *)&data[0] << std::dec
|
|
<< ") @addr 0x" << std::hex << addr;
|
|
break;
|
|
case 1:
|
|
LOG(TRACE) << prefix << "write of " << length << " bytes (0x" << std::hex << (uint16_t)data[0] << std::dec
|
|
<< ") @addr 0x" << std::hex << addr;
|
|
break;
|
|
default:
|
|
LOG(TRACE) << prefix << "write of " << length << " bytes @addr " << addr;
|
|
}
|
|
#endif
|
|
try {
|
|
switch (space) {
|
|
case traits<BASE>::MEM: {
|
|
if (unlikely((access && iss::access_type::FETCH) && (addr & 0x1) == 1)) {
|
|
fault_data = addr;
|
|
if (access && iss::access_type::DEBUG) throw trap_access(0, addr);
|
|
this->reg.trap_state = (1 << 31); // issue trap 0
|
|
return iss::Err;
|
|
}
|
|
try {
|
|
if(length>1 && (addr&(length-1))){
|
|
this->reg.trap_state = 1<<31 | 6<<16;
|
|
fault_data=addr;
|
|
return iss::Err;
|
|
}
|
|
auto res = type==iss::address_type::PHYSICAL?
|
|
write_mem(phys_addr_t{access, space, addr}, length, data):
|
|
write_mem(BASE::v2p(iss::addr_t{access, type, space, addr}), length, data);
|
|
if (unlikely(res != iss::Ok)) {
|
|
this->reg.trap_state = (1 << 31) | (7 << 16); // issue trap 7 (Store/AMO access fault)
|
|
fault_data=addr;
|
|
}
|
|
return res;
|
|
} catch (trap_access &ta) {
|
|
this->reg.trap_state = (1 << 31) | ta.id;
|
|
fault_data=ta.addr;
|
|
return iss::Err;
|
|
}
|
|
|
|
phys_addr_t paddr = BASE::v2p(iss::addr_t{access, type, space, addr});
|
|
if ((paddr.val + length) > mem.size()) return iss::Err;
|
|
switch (paddr.val) {
|
|
case 0x10013000: // UART0 base, TXFIFO reg
|
|
case 0x10023000: // UART1 base, TXFIFO reg
|
|
uart_buf << (char)data[0];
|
|
if (((char)data[0]) == '\n' || data[0] == 0) {
|
|
// LOG(INFO)<<"UART"<<((paddr.val>>16)&0x3)<<" send
|
|
// '"<<uart_buf.str()<<"'";
|
|
std::cout << uart_buf.str();
|
|
uart_buf.str("");
|
|
}
|
|
return iss::Ok;
|
|
case 0x10008000: { // HFROSC base, hfrosccfg reg
|
|
auto &p = mem(paddr.val / mem.page_size);
|
|
auto offs = paddr.val & mem.page_addr_mask;
|
|
std::copy(data, data + length, p.data() + offs);
|
|
auto &x = *(p.data() + offs + 3);
|
|
if (x & 0x40) x |= 0x80; // hfroscrdy = 1 if hfroscen==1
|
|
return iss::Ok;
|
|
}
|
|
case 0x10008008: { // HFROSC base, pllcfg reg
|
|
auto &p = mem(paddr.val / mem.page_size);
|
|
auto offs = paddr.val & mem.page_addr_mask;
|
|
std::copy(data, data + length, p.data() + offs);
|
|
auto &x = *(p.data() + offs + 3);
|
|
x |= 0x80; // set pll lock upon writing
|
|
return iss::Ok;
|
|
} break;
|
|
default: {}
|
|
}
|
|
} break;
|
|
case traits<BASE>::CSR: {
|
|
if (length != sizeof(reg_t)) return iss::Err;
|
|
return write_csr(addr, *reinterpret_cast<const reg_t *>(data));
|
|
} break;
|
|
case traits<BASE>::FENCE: {
|
|
if ((addr + length) > mem.size()) return iss::Err;
|
|
switch (addr) {
|
|
case 2:
|
|
case 3: {
|
|
ptw.clear();
|
|
auto tvm = state.mstatus.TVM;
|
|
return iss::Ok;
|
|
}
|
|
}
|
|
} break;
|
|
case traits<BASE>::RES: {
|
|
atomic_reservation[addr] = data[0];
|
|
} break;
|
|
default:
|
|
return iss::Err;
|
|
}
|
|
return iss::Ok;
|
|
} catch (trap_access &ta) {
|
|
this->reg.trap_state = (1 << 31) | ta.id;
|
|
fault_data=ta.addr;
|
|
return iss::Err;
|
|
}
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_csr(unsigned addr, reg_t &val) {
|
|
if (addr >= csr.size()) return iss::Err;
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
if (this->reg.PRIV < req_priv_lvl) // not having required privileges
|
|
throw illegal_instruction_fault(this->fault_data);
|
|
auto it = csr_rd_cb.find(addr);
|
|
if (it == csr_rd_cb.end() || !it->second) // non existent register
|
|
throw illegal_instruction_fault(this->fault_data);
|
|
return (this->*(it->second))(addr, val);
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_csr(unsigned addr, reg_t val) {
|
|
if (addr >= csr.size()) return iss::Err;
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
if (this->reg.PRIV < req_priv_lvl) // not having required privileges
|
|
throw illegal_instruction_fault(this->fault_data);
|
|
if((addr&0xc00)==0xc00) // writing to read-only region
|
|
throw illegal_instruction_fault(this->fault_data);
|
|
auto it = csr_wr_cb.find(addr);
|
|
if (it == csr_wr_cb.end() || !it->second) // non existent register
|
|
throw illegal_instruction_fault(this->fault_data);
|
|
return (this->*(it->second))(addr, val);
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_reg(unsigned addr, reg_t &val) {
|
|
val = csr[addr];
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_null(unsigned addr, reg_t &val) {
|
|
val = 0;
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_reg(unsigned addr, reg_t val) {
|
|
csr[addr] = val;
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_cycle(unsigned addr, reg_t &val) {
|
|
auto cycle_val = this->reg.icount + cycle_offset;
|
|
if (addr == mcycle) {
|
|
val = static_cast<reg_t>(cycle_val);
|
|
} else if (addr == mcycleh) {
|
|
if (sizeof(typename traits<BASE>::reg_t) != 4) return iss::Err;
|
|
val = static_cast<reg_t>(cycle_val >> 32);
|
|
}
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_cycle(unsigned addr, reg_t val) {
|
|
if (sizeof(typename traits<BASE>::reg_t) != 4) {
|
|
if (addr == mcycleh)
|
|
return iss::Err;
|
|
mcycle_csr = static_cast<uint64_t>(val);
|
|
} else {
|
|
if (addr == mcycle) {
|
|
mcycle_csr = (mcycle_csr & 0xffffffff00000000) + val;
|
|
} else {
|
|
mcycle_csr = (static_cast<uint64_t>(val)<<32) + (mcycle_csr & 0xffffffff);
|
|
}
|
|
}
|
|
cycle_offset = mcycle_csr-this->reg.icount; // TODO: relying on wrap-around
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_instret(unsigned addr, reg_t &val) {
|
|
if ((addr&0xff) == (minstret&0xff)) {
|
|
val = static_cast<reg_t>(this->reg.instret);
|
|
} else if ((addr&0xff) == (minstreth&0xff)) {
|
|
if (sizeof(typename traits<BASE>::reg_t) != 4) return iss::Err;
|
|
val = static_cast<reg_t>(this->reg.instret >> 32);
|
|
}
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_instret(unsigned addr, reg_t val) {
|
|
if (sizeof(typename traits<BASE>::reg_t) != 4) {
|
|
if ((addr&0xff) == (minstreth&0xff))
|
|
return iss::Err;
|
|
this->reg.instret = static_cast<uint64_t>(val);
|
|
} else {
|
|
if ((addr&0xff) == (minstret&0xff)) {
|
|
this->reg.instret = (this->reg.instret & 0xffffffff00000000) + val;
|
|
} else {
|
|
this->reg.instret = (static_cast<uint64_t>(val)<<32) + (this->reg.instret & 0xffffffff);
|
|
}
|
|
}
|
|
this->reg.instret--;
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_time(unsigned addr, reg_t &val) {
|
|
uint64_t time_val = this->reg.icount / (100000000 / 32768 - 1); //-> ~3052;
|
|
if (addr == time) {
|
|
val = static_cast<reg_t>(time_val);
|
|
} else if (addr == timeh) {
|
|
if (sizeof(typename traits<BASE>::reg_t) != 4) return iss::Err;
|
|
val = static_cast<reg_t>(time_val >> 32);
|
|
}
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_mtvec(unsigned addr, reg_t &val) {
|
|
val = csr[mtvec] & ~2;
|
|
return iss::Ok;
|
|
}
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_status(unsigned addr, reg_t &val) {
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
val = state.mstatus & hart_state_type::get_mask(req_priv_lvl);
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_status(unsigned addr, reg_t val) {
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
state.write_mstatus(val, req_priv_lvl);
|
|
check_interrupt();
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_ie(unsigned addr, reg_t &val) {
|
|
val = csr[mie];
|
|
val &= csr[mideleg];
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_hartid(unsigned addr, reg_t &val) {
|
|
val = mhartid_reg;
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_ie(unsigned addr, reg_t val) {
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
auto mask = get_irq_mask(req_priv_lvl);
|
|
csr[mie] = (csr[mie] & ~mask) | (val & mask);
|
|
check_interrupt();
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::read_ip(unsigned addr, reg_t &val) {
|
|
val = csr[mip];
|
|
val &= csr[mideleg];
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_ip(unsigned addr, reg_t val) {
|
|
auto req_priv_lvl = (addr >> 8) & 0x3;
|
|
auto mask = get_irq_mask(req_priv_lvl);
|
|
mask &= ~(1 << 7); // MTIP is read only
|
|
csr[mip] = (csr[mip] & ~mask) | (val & mask);
|
|
check_interrupt();
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> iss::status riscv_hart_mu_p<BASE, FEAT>::write_mepc(unsigned addr, reg_t val) {
|
|
auto mask = get_pc_mask();
|
|
csr[addr] = val;//(csr[addr] & ~mask) | (val & mask);
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT>
|
|
iss::status riscv_hart_mu_p<BASE, FEAT>::read_mem(phys_addr_t paddr, unsigned length, uint8_t *const data) {
|
|
if(mem_read_cb) return mem_read_cb(paddr, length, data);
|
|
switch (paddr.val) {
|
|
case 0x0200BFF8: { // CLINT base, mtime reg
|
|
if (sizeof(reg_t) < length) return iss::Err;
|
|
reg_t time_val;
|
|
this->read_csr(time, time_val);
|
|
std::copy((uint8_t *)&time_val, ((uint8_t *)&time_val) + length, data);
|
|
} break;
|
|
case 0x10008000: {
|
|
const mem_type::page_type &p = mem(paddr.val / mem.page_size);
|
|
uint64_t offs = paddr.val & mem.page_addr_mask;
|
|
std::copy(p.data() + offs, p.data() + offs + length, data);
|
|
if (this->reg.icount > 30000) data[3] |= 0x80;
|
|
} break;
|
|
default: {
|
|
for(auto offs=0U; offs<length; ++offs) {
|
|
*(data + offs)=mem[(paddr.val+offs)%mem.size()];
|
|
}
|
|
}
|
|
}
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT>
|
|
iss::status riscv_hart_mu_p<BASE, FEAT>::write_mem(phys_addr_t paddr, unsigned length, const uint8_t *const data) {
|
|
if(mem_write_cb) return mem_write_cb(paddr, length, data);
|
|
switch (paddr.val) {
|
|
case 0x10013000: // UART0 base, TXFIFO reg
|
|
case 0x10023000: // UART1 base, TXFIFO reg
|
|
uart_buf << (char)data[0];
|
|
if (((char)data[0]) == '\n' || data[0] == 0) {
|
|
// LOG(INFO)<<"UART"<<((paddr.val>>16)&0x3)<<" send
|
|
// '"<<uart_buf.str()<<"'";
|
|
std::cout << uart_buf.str();
|
|
uart_buf.str("");
|
|
}
|
|
break;
|
|
case 0x10008000: { // HFROSC base, hfrosccfg reg
|
|
mem_type::page_type &p = mem(paddr.val / mem.page_size);
|
|
size_t offs = paddr.val & mem.page_addr_mask;
|
|
std::copy(data, data + length, p.data() + offs);
|
|
uint8_t &x = *(p.data() + offs + 3);
|
|
if (x & 0x40) x |= 0x80; // hfroscrdy = 1 if hfroscen==1
|
|
} break;
|
|
case 0x10008008: { // HFROSC base, pllcfg reg
|
|
mem_type::page_type &p = mem(paddr.val / mem.page_size);
|
|
size_t offs = paddr.val & mem.page_addr_mask;
|
|
std::copy(data, data + length, p.data() + offs);
|
|
uint8_t &x = *(p.data() + offs + 3);
|
|
x |= 0x80; // set pll lock upon writing
|
|
} break;
|
|
default: {
|
|
mem_type::page_type &p = mem(paddr.val / mem.page_size);
|
|
std::copy(data, data + length, p.data() + (paddr.val & mem.page_addr_mask));
|
|
// tohost handling in case of riscv-test
|
|
if (paddr.access && iss::access_type::FUNC) {
|
|
auto tohost_upper = (traits<BASE>::XLEN == 32 && paddr.val == (tohost + 4)) ||
|
|
(traits<BASE>::XLEN == 64 && paddr.val == tohost);
|
|
auto tohost_lower =
|
|
(traits<BASE>::XLEN == 32 && paddr.val == tohost) || (traits<BASE>::XLEN == 64 && paddr.val == tohost);
|
|
if (tohost_lower || tohost_upper) {
|
|
uint64_t hostvar = *reinterpret_cast<uint64_t *>(p.data() + (tohost & mem.page_addr_mask));
|
|
if (tohost_upper || (tohost_lower && to_host_wr_cnt > 0)) {
|
|
switch (hostvar >> 48) {
|
|
case 0:
|
|
if (hostvar != 0x1) {
|
|
LOG(FATAL) << "tohost value is 0x" << std::hex << hostvar << std::dec << " (" << hostvar
|
|
<< "), stopping simulation";
|
|
} else {
|
|
LOG(INFO) << "tohost value is 0x" << std::hex << hostvar << std::dec << " (" << hostvar
|
|
<< "), stopping simulation";
|
|
}
|
|
this->reg.trap_state=std::numeric_limits<uint32_t>::max();
|
|
this->interrupt_sim=hostvar;
|
|
break;
|
|
//throw(iss::simulation_stopped(hostvar));
|
|
case 0x0101: {
|
|
char c = static_cast<char>(hostvar & 0xff);
|
|
if (c == '\n' || c == 0) {
|
|
LOG(INFO) << "tohost send '" << uart_buf.str() << "'";
|
|
uart_buf.str("");
|
|
} else
|
|
uart_buf << c;
|
|
to_host_wr_cnt = 0;
|
|
} break;
|
|
default:
|
|
break;
|
|
}
|
|
} else if (tohost_lower)
|
|
to_host_wr_cnt++;
|
|
} else if ((traits<BASE>::XLEN == 32 && paddr.val == fromhost + 4) ||
|
|
(traits<BASE>::XLEN == 64 && paddr.val == fromhost)) {
|
|
uint64_t fhostvar = *reinterpret_cast<uint64_t *>(p.data() + (fromhost & mem.page_addr_mask));
|
|
*reinterpret_cast<uint64_t *>(p.data() + (tohost & mem.page_addr_mask)) = fhostvar;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return iss::Ok;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> inline void riscv_hart_mu_p<BASE, FEAT>::reset(uint64_t address) {
|
|
BASE::reset(address);
|
|
state.mstatus = hart_state_type::mstatus_reset_val;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> void riscv_hart_mu_p<BASE, FEAT>::check_interrupt() {
|
|
auto ideleg = csr[mideleg];
|
|
// Multiple simultaneous interrupts and traps at the same privilege level are
|
|
// handled in the following decreasing priority order:
|
|
// external interrupts, software interrupts, timer interrupts, then finally
|
|
// any synchronous traps.
|
|
auto ena_irq = csr[mip] & csr[mie];
|
|
|
|
bool mie = state.mstatus.MIE;
|
|
auto m_enabled = this->reg.PRIV < PRIV_M || (this->reg.PRIV == PRIV_M && mie);
|
|
auto enabled_interrupts = m_enabled ? ena_irq & ~ideleg : 0;
|
|
|
|
if (enabled_interrupts != 0) {
|
|
int res = 0;
|
|
while ((enabled_interrupts & 1) == 0) {
|
|
enabled_interrupts >>= 1;
|
|
res++;
|
|
}
|
|
this->reg.pending_trap = res << 16 | 1; // 0x80 << 24 | (cause << 16) | trap_id
|
|
}
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> uint64_t riscv_hart_mu_p<BASE, FEAT>::enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) {
|
|
// flags are ACTIVE[31:31], CAUSE[30:16], TRAPID[15:0]
|
|
// calculate and write mcause val
|
|
auto trap_id = bit_sub<0, 16>(flags);
|
|
auto cause = bit_sub<16, 15>(flags);
|
|
if (trap_id == 0 && cause == 11) cause = 0x8 + this->reg.PRIV; // adjust environment call cause
|
|
// calculate effective privilege level
|
|
auto new_priv = PRIV_M;
|
|
if (trap_id == 0) { // exception
|
|
if (this->reg.PRIV != PRIV_M && ((csr[medeleg] >> cause) & 0x1) != 0)
|
|
new_priv = PRIV_U;
|
|
// store ret addr in xepc register
|
|
csr[uepc | (new_priv << 8)] = static_cast<reg_t>(addr); // store actual address instruction of exception
|
|
/*
|
|
* write mtval if new_priv=M_MODE, spec says:
|
|
* When a hardware breakpoint is triggered, or an instruction-fetch, load,
|
|
* or store address-misaligned,
|
|
* access, or page-fault exception occurs, mtval is written with the
|
|
* faulting effective address.
|
|
*/
|
|
csr[utval | (new_priv << 8)] = cause==2?((instr & 0x3)==3?instr:instr&0xffff):fault_data;
|
|
fault_data = 0;
|
|
} else {
|
|
if (this->reg.PRIV != PRIV_M && ((csr[mideleg] >> cause) & 0x1) != 0)
|
|
new_priv = PRIV_U;
|
|
csr[uepc | (new_priv << 8)] = this->reg.NEXT_PC; // store next address if interrupt
|
|
this->reg.pending_trap = 0;
|
|
}
|
|
size_t adr = ucause | (new_priv << 8);
|
|
csr[adr] = (trap_id << 31) + cause;
|
|
// update mstatus
|
|
// xPP field of mstatus is written with the active privilege mode at the time
|
|
// of the trap; the x PIE field of mstatus
|
|
// is written with the value of the active interrupt-enable bit at the time of
|
|
// the trap; and the x IE field of mstatus
|
|
// is cleared
|
|
// store the actual privilege level in yPP and store interrupt enable flags
|
|
switch (new_priv) {
|
|
case PRIV_M:
|
|
state.mstatus.MPP = this->reg.PRIV;
|
|
state.mstatus.MPIE = state.mstatus.MIE;
|
|
state.mstatus.MIE = false;
|
|
break;
|
|
case PRIV_U:
|
|
state.mstatus.UPIE = state.mstatus.UIE;
|
|
state.mstatus.UIE = false;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// get trap vector
|
|
auto ivec = csr[utvec | (new_priv << 8)];
|
|
// calculate addr// set NEXT_PC to trap addressess to jump to based on MODE
|
|
// bits in mtvec
|
|
this->reg.NEXT_PC = ivec & ~0x1UL;
|
|
if ((ivec & 0x1) == 1 && trap_id != 0) this->reg.NEXT_PC += 4 * cause;
|
|
// reset trap state
|
|
this->reg.PRIV = new_priv;
|
|
this->reg.trap_state = 0;
|
|
std::array<char, 32> buffer;
|
|
sprintf(buffer.data(), "0x%016lx", addr);
|
|
if((flags&0xffffffff) != 0xffffffff)
|
|
CLOG(INFO, disass) << (trap_id ? "Interrupt" : "Trap") << " with cause '"
|
|
<< (trap_id ? irq_str[cause] : trap_str[cause]) << "' (" << cause << ")"
|
|
<< " at address " << buffer.data() << " occurred, changing privilege level from "
|
|
<< lvl[this->reg.PRIV] << " to " << lvl[new_priv];
|
|
return this->reg.NEXT_PC;
|
|
}
|
|
|
|
template <typename BASE, features_e FEAT> uint64_t riscv_hart_mu_p<BASE, FEAT>::leave_trap(uint64_t flags) {
|
|
auto cur_priv = this->reg.PRIV;
|
|
auto inst_priv = (flags & 0x3)? 3:0;
|
|
auto status = state.mstatus;
|
|
// pop the relevant lower-privilege interrupt enable and privilege mode stack
|
|
// clear respective yIE
|
|
switch (inst_priv) {
|
|
case PRIV_M:
|
|
this->reg.PRIV = state.mstatus.MPP;
|
|
state.mstatus.MPP = 0; // clear mpp to U mode
|
|
state.mstatus.MIE = state.mstatus.MPIE;
|
|
state.mstatus.MPIE = 1;
|
|
break;
|
|
case PRIV_U:
|
|
this->reg.PRIV = 0;
|
|
state.mstatus.UIE = state.mstatus.UPIE;
|
|
state.mstatus.UPIE = 1;
|
|
break;
|
|
}
|
|
// sets the pc to the value stored in the x epc register.
|
|
this->reg.NEXT_PC = csr[uepc | inst_priv << 8];
|
|
CLOG(INFO, disass) << "Executing xRET , changing privilege level from " << lvl[cur_priv] << " to "
|
|
<< lvl[this->reg.PRIV];
|
|
check_interrupt();
|
|
return this->reg.NEXT_PC;
|
|
}
|
|
|
|
} // namespace arch
|
|
} // namespace iss
|
|
|
|
#endif /* _RISCV_HART_MU_P_H */
|