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target/riscv: fix cross-page misaligned access when mmu not enabled 

When mmu is disabled, simply call the physical read/write function
This commit is contained in:
Mark Zhuang 2024-10-14 00:18:11 +08:00
parent 593b377073
commit 4a1bd80842
1 changed files with 24 additions and 13 deletions
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29
src/target/riscv/riscv.c
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@ -3061,24 +3061,18 @@ static int riscv_virt2phys(struct target *target, target_addr_t virtual, target_
virtual, physical);
}
static int check_access_request(struct target *target, target_addr_t address,
static int check_virt_memory_access(struct target *target, target_addr_t address,
uint32_t size, uint32_t count, bool is_write)
{
const bool is_misaligned = address % size != 0;
// TODO: This assumes that size of each page is 4 KiB, which is not necessarily the case.
const bool crosses_page_boundary = RISCV_PGBASE(address + size * count - 1) != RISCV_PGBASE(address);
if (is_misaligned && crosses_page_boundary) {
int mmu_enabled;
int result = riscv_mmu(target, &mmu_enabled);
if (result != ERROR_OK)
return result;
if (mmu_enabled) {
LOG_TARGET_ERROR(target, "Mis-aligned memory %s (address=0x%" TARGET_PRIxADDR ", size=%d, count=%d)"
" would access an element across page boundary. This is not supported.",
is_write ? "write" : "read", address, size, count);
return ERROR_FAIL;
}
}
return ERROR_OK;
}
@ -3097,11 +3091,20 @@ static int riscv_read_memory(struct target *target, target_addr_t address,
return ERROR_OK;
}
int result = check_access_request(target, address, size, count, false);
int mmu_enabled;
int result = riscv_mmu(target, &mmu_enabled);
if (result != ERROR_OK)
return result;
RISCV_INFO(r);
if (!mmu_enabled)
return r->read_memory(target, address, size, count, buffer, size);
result = check_virt_memory_access(target, address, size, count, false);
if (result != ERROR_OK)
return result;
uint32_t current_count = 0;
while (current_count < count) {
target_addr_t physical_addr;
@ -3142,7 +3145,8 @@ static int riscv_write_memory(struct target *target, target_addr_t address,
return ERROR_OK;
}
int result = check_access_request(target, address, size, count, true);
int mmu_enabled;
int result = riscv_mmu(target, &mmu_enabled);
if (result != ERROR_OK)
return result;
@ -3150,6 +3154,13 @@ static int riscv_write_memory(struct target *target, target_addr_t address,
if (!tt)
return ERROR_FAIL;
if (!mmu_enabled)
return tt->write_memory(target, address, size, count, buffer);
result = check_virt_memory_access(target, address, size, count, true);
if (result != ERROR_OK)
return result;
uint32_t current_count = 0;
while (current_count < count) {
target_addr_t physical_addr;