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2 Commits

  1. 49
      src/memory/memory.c
  2. 24
      src/memory/mmu.c

@ -63,6 +63,13 @@ void mem_write8(uint32_t address, uint8_t value)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 1 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid write of size 1 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory write
pthread_mutex_lock(&memory_mutex);
memory[address] = value;
@ -94,6 +101,13 @@ void mem_write16(uint32_t address, uint16_t value)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 2 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid write of size 2 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory write
pthread_mutex_lock(&memory_mutex);
*((uint16_t*) &memory[address]) = value;
@ -125,6 +139,13 @@ void mem_write32(uint32_t address, uint32_t value)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 4 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid write of size 1 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory write
pthread_mutex_lock(&memory_mutex);
*((uint32_t*) &memory[address]) = value;
@ -155,6 +176,13 @@ uint8_t mem_read8(uint32_t address)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 1 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid read of size 1 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory read
pthread_mutex_lock(&memory_mutex);
uint8_t tr = memory[address];
@ -186,6 +214,13 @@ uint16_t mem_read16(uint32_t address)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 2 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid read of size 2 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory read
pthread_mutex_lock(&memory_mutex);
uint16_t tr = *((uint16_t*) &memory[address]);
@ -217,6 +252,13 @@ uint32_t mem_read32(uint32_t address)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 4 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid read of size 4 outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory read
pthread_mutex_lock(&memory_mutex);
uint32_t tr = *((uint32_t*) &memory[address]);
@ -240,6 +282,13 @@ uint32_t mem_fetch(uint32_t address)
io = io->next;
}
// Check if we are inside of physical memory
if(address + 4 > memory_size)
{
fprintf(stderr, "MEMORY: Invalid fetch outside of physical memory at address 0x%x\n", address);
exit(EXIT_FAILURE);
}
// Proceed with memory read
pthread_mutex_lock(&memory_mutex);
uint32_t tr = *((uint32_t*) &memory[address]);

@ -89,6 +89,18 @@ uint32_t mmu_resolve(rv32_cpu_t* cpu, memory_access_type_t access_type, uint32_t
// Leaf PTE, we are ready to resolve the mapping
// This is a 4 MiB megapage
// For an execute, check if we are allowed to execute
if(access_type == INSTRUCTION_FETCH && !(pte & PTE_X))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// For a write, check if we are allowed to write
if(access_type == WRITE && !(pte & PTE_W))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// For a read, check if we are allowed to read
if(access_type == READ && !(pte & PTE_R))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// Physical Address: [PPN[1] = pte.PPN[1], PPN[0] = vaddr.VPN[0], offset]
uint32_t paddr = 0;
paddr |= (PTE_PPN_1(pte) << 22);
@ -120,6 +132,18 @@ uint32_t mmu_resolve(rv32_cpu_t* cpu, memory_access_type_t access_type, uint32_t
exit(EXIT_FAILURE);
}
// For an execute, check if we are allowed to execute
if(access_type == INSTRUCTION_FETCH && !(pte & PTE_X))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// For a write, check if we are allowed to write
if(access_type == WRITE && !(pte & PTE_W))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// For a read, check if we are allowed to read
if(access_type == READ && !(pte & PTE_R))
exception_trigger(cpu, mmu_scause_from_access(access_type), vaddr);
// Physical Address: [PPN[1] = pte.PPN[1], PPN[0] = pte.PPN[0], offset]
uint32_t paddr = 0;
paddr |= (PTE_PPN_1(pte) << 22);

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