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gdb: add memory write support

This commit is contained in:
redoste 2023-05-24 23:30:29 +02:00
parent 3aa11b4252
commit 2f6ee59d43
Signed by: redoste
SSH Key Fingerprint: SHA256:Y1z/cbVN8OVoFPXzVgklSqoZnyQQ/PQM8YwhMtxMk90
1 changed files with 31 additions and 2 deletions
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33
src/gdb/gdb.c
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@ -284,6 +284,34 @@ static void gdb_handle_read_memory(const char* packet)
free(reply_buffer);
}
static void gdb_handle_write_memory(const char* packet)
{
char address_hex[16] = {0}, size_hex[16] = {0};
uint8_t* read_address;
size_t read_size;
packet++; // consume 'M'
for (size_t i = 0; i < sizeof(address_hex); i++) {
address_hex[i] = *(packet++); // consume address
if (*packet == ',') break;
}
packet++; // consume ','
for (size_t i = 0; i < sizeof(size_hex); i++) {
size_hex[i] = *(packet++); // consume size
if (*packet == ':') break;
}
packet++; // consume ':'
read_address = (uint8_t*) gdb_unhexlify(address_hex);
read_size = (size_t) gdb_unhexlify(size_hex);
// TODO : Detect invalid writes and prevent TLB misses
for (size_t i = 0; i < read_size; i++) {
read_address[i] = (uint8_t)gdb_unhexlify_sized(&packet[i * 2], 2);
}
gdb_send_packet("OK", 2);
}
static bool gdb_parse_hardware_breakpoint_packet(const char* packet, void** read_address)
{
packet++; // consume 'z' or 'Z'
@ -437,8 +465,9 @@ void gdb_main(gdb_cpu_state_t* cpu_state)
case 'P':
gdb_handle_write_register(cpu_state, packet_buffer);
break;
// case 'M': // Write memory
case 'M':
gdb_handle_write_memory(packet_buffer);
break;
case 'k': // Kill request
abort();