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func_sim.cpp
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func_sim.cpp
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#include "func_sim.h"
#include "reg_def.h"
Func_Sim::Func_Sim():
elf_reader(), inst_fetcher()
{
err_no = NOTHING;
memset(memory, 0, sizeof(memory));
memset(regfile, 0, sizeof(regfile));
memset(fregfile, 0, sizeof(fregfile));
}
bool Func_Sim::readelf(char *filename, char *elfname, char **vals, int n_val)
{
return elf_reader.read_elf(filename, elfname, vals, n_val);
}
void Func_Sim::init_RegMem()
{
memset(fregfile, 0, sizeof(fregfile));
memset(regfile, 0, sizeof(regfile));
memset(memory, 0, sizeof(memory));
}
bool Func_Sim::init(char* filename, char *elfname, char **vals, int n_val)
{
if (!readelf(filename, elfname, vals, n_val))
return false;
init_RegMem();
load_memory(filename);
inst_fetcher.set_next_pc((REG)elf_reader.madr);
inst_fetcher.set_pc((REG)elf_reader.madr);
regfile[3] = (REG)elf_reader.gp;
regfile[2] = (REG)FS_SP_DEFAULT;
return true;
}
void Func_Sim::load_memory(char* filename)
{
FILE* file = fopen(filename, "r");
fseek(file, elf_reader.cadr, 0);
fread(&memory[elf_reader.cvadr], 1, elf_reader.csize, file);
fseek(file, elf_reader.dadr, 0);
fread(&memory[elf_reader.dvadr], 1, elf_reader.dsize, file);
fclose(file);
}
void Func_Sim::one_step(bool verbose)
{
unsigned long long pc = inst_fetcher.get_pc();
if (pc < (unsigned long long)elf_reader.cvadr || pc > (unsigned long long)(elf_reader.cvadr + elf_reader.csize))
err_no = INVALID_PC;
if (pc % 4 != 0)
err_no = INVALID_PC;
if (pc == elf_reader.mend - 4)
err_no = HALT;
if (err_no != NOTHING)
return;
regfile[0] = 0;
inst_fetcher.set_inst32(memory);
inst_fetcher.split32();
if (verbose)
inst_fetcher.print_assembly();
err_no = inst_fetcher.just_sim(regfile, fregfile, memory);
if (err_no != NOTHING)
return;
regfile[0] = 0;
}
void Func_Sim::sim(bool verbose)
{
while(true)
{
one_step(verbose);
if (err_no != NOTHING)
return;
}
}
ERROR_NUM Func_Sim::get_errno()
{
return err_no;
}
REG Func_Sim::read_regfile(int idx)
{
if (idx < 0 || idx > 31)
return 0xDEADBEEF;
return regfile[idx];
}
char Func_Sim::read_memory(long long addr)
{
if (addr < 0 || addr > FS_MAX_MEMORY)
return 0xFA;
return memory[addr];
}
void Func_Sim::print_res()
{
printf("\nFunction-sim Mode Done!\n");
if (err_no == INVALID_PC)
{
printf("Invalid PC: 0x%016llx\n", inst_fetcher.get_pc());
return;
}
if (err_no == INVALID_INST)
{
printf("Invalid inst: [%llx] %08x\n", inst_fetcher.get_pc(), inst_fetcher.get_inst32());
return;
}
if (err_no == INVALID_ADDR_ALIGNMENT)
{
printf("Invalid address alignment: [%llx] %08x\n", inst_fetcher.get_pc(), inst_fetcher.get_inst32());
return;
}
if (err_no == HALT)
printf("Machine halt!\n");
for (unsigned long long val_i = 0; val_i < elf_reader.val_n; val_i++)
{
printf("memory block %llu, %s:\n", val_i, elf_reader.val_name[val_i]);
for (unsigned long long a = 0; a < elf_reader.val_size[val_i] / 4; a++)
printf("0x%llx - 0x%llx: %02x %02x %02x %02x\n",
elf_reader.val_adr[val_i] + 4 * a, elf_reader.val_adr[val_i] + 4 * a + 3,
(unsigned char)memory[elf_reader.val_adr[val_i] + 4 * a],
(unsigned char)memory[elf_reader.val_adr[val_i] + 4 * a + 1],
(unsigned char)memory[elf_reader.val_adr[val_i] + 4 * a + 2],
(unsigned char)memory[elf_reader.val_adr[val_i] + 4 * a + 3]);
}
}