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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016-2020 by Marc Schink <dev@zapb.de>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stddef.h>
#include <stdint.h>
#include <helper/log.h>
#include <helper/binarybuffer.h>
#include <helper/command.h>
#include <rtt/rtt.h>
#include <target/rtt.h>
#include "target.h"
static int read_rtt_channel(struct target *target,
const struct rtt_control *ctrl, unsigned int channel_index,
enum rtt_channel_type type, struct rtt_channel *channel)
{
int ret;
uint8_t buf[RTT_CHANNEL_SIZE];
target_addr_t address;
address = ctrl->address + RTT_CB_SIZE + (channel_index * RTT_CHANNEL_SIZE);
if (type == RTT_CHANNEL_TYPE_DOWN)
address += ctrl->num_up_channels * RTT_CHANNEL_SIZE;
ret = target_read_buffer(target, address, RTT_CHANNEL_SIZE, buf);
if (ret != ERROR_OK)
return ret;
channel->address = address;
channel->name_addr = buf_get_u32(buf + 0, 0, 32);
channel->buffer_addr = buf_get_u32(buf + 4, 0, 32);
channel->size = buf_get_u32(buf + 8, 0, 32);
channel->write_pos = buf_get_u32(buf + 12, 0, 32);
channel->read_pos = buf_get_u32(buf + 16, 0, 32);
channel->flags = buf_get_u32(buf + 20, 0, 32);
return ERROR_OK;
}
int target_rtt_start(struct target *target, const struct rtt_control *ctrl,
void *user_data)
{
return ERROR_OK;
}
int target_rtt_stop(struct target *target, void *user_data)
{
return ERROR_OK;
}
static int read_channel_name(struct target *target, target_addr_t address,
char *name, size_t length)
{
size_t offset;
offset = 0;
while (offset < length) {
int ret;
size_t read_length;
read_length = MIN(32, length - offset);
ret = target_read_buffer(target, address + offset, read_length,
(uint8_t *)name + offset);
if (ret != ERROR_OK)
return ret;
if (memchr(name + offset, '\0', read_length))
return ERROR_OK;
offset += read_length;
}
name[length - 1] = '\0';
return ERROR_OK;
}
static int write_to_channel(struct target *target,
const struct rtt_channel *channel, const uint8_t *buffer,
size_t *length)
{
int ret;
uint32_t len;
if (!*length)
return ERROR_OK;
if (channel->write_pos == channel->read_pos) {
uint32_t first_length;
len = MIN(*length, channel->size - 1);
first_length = MIN(len, channel->size - channel->write_pos);
ret = target_write_buffer(target,
channel->buffer_addr + channel->write_pos, first_length,
buffer);
if (ret != ERROR_OK)
return ret;
ret = target_write_buffer(target, channel->buffer_addr,
len - first_length, buffer + first_length);
if (ret != ERROR_OK)
return ret;
} else if (channel->write_pos < channel->read_pos) {
len = MIN(*length, channel->read_pos - channel->write_pos - 1);
if (!len) {
*length = 0;
return ERROR_OK;
}
ret = target_write_buffer(target,
channel->buffer_addr + channel->write_pos, len, buffer);
if (ret != ERROR_OK)
return ret;
} else {
uint32_t first_length;
len = MIN(*length,
channel->size - channel->write_pos + channel->read_pos - 1);
if (!len) {
*length = 0;
return ERROR_OK;
}
first_length = MIN(len, channel->size - channel->write_pos);
ret = target_write_buffer(target,
channel->buffer_addr + channel->write_pos, first_length,
buffer);
if (ret != ERROR_OK)
return ret;
buffer = buffer + first_length;
ret = target_write_buffer(target, channel->buffer_addr,
len - first_length, buffer);
if (ret != ERROR_OK)
return ret;
}
ret = target_write_u32(target, channel->address + 12,
(channel->write_pos + len) % channel->size);
if (ret != ERROR_OK)
return ret;
*length = len;
return ERROR_OK;
}
static bool channel_is_active(const struct rtt_channel *channel)
{
if (!channel)
return false;
if (!channel->size)
return false;
return true;
}
int target_rtt_write_callback(struct target *target, struct rtt_control *ctrl,
unsigned int channel_index, const uint8_t *buffer, size_t *length,
void *user_data)
{
int ret;
struct rtt_channel channel;
ret = read_rtt_channel(target, ctrl, channel_index,
RTT_CHANNEL_TYPE_DOWN, &channel);
if (ret != ERROR_OK) {
LOG_ERROR("rtt: Failed to read down-channel %u description",
channel_index);
return ret;
}
if (!channel_is_active(&channel)) {
LOG_WARNING("rtt: Down-channel %u is not active", channel_index);
return ERROR_OK;
}
if (channel.size < RTT_CHANNEL_BUFFER_MIN_SIZE) {
LOG_WARNING("rtt: Down-channel %u is not large enough",
channel_index);
return ERROR_OK;
}
ret = write_to_channel(target, &channel, buffer, length);
if (ret != ERROR_OK)
return ret;
LOG_DEBUG("rtt: Wrote %zu bytes into down-channel %u", *length,
channel_index);
return ERROR_OK;
}
int target_rtt_read_control_block(struct target *target,
target_addr_t address, struct rtt_control *ctrl, void *user_data)
{
int ret;
uint8_t buf[RTT_CB_SIZE];
ret = target_read_buffer(target, address, RTT_CB_SIZE, buf);
if (ret != ERROR_OK)
return ret;
memcpy(ctrl->id, buf, RTT_CB_MAX_ID_LENGTH);
ctrl->id[RTT_CB_MAX_ID_LENGTH - 1] = '\0';
ctrl->num_up_channels = buf_get_u32(buf + RTT_CB_MAX_ID_LENGTH + 0,
0, 32);
ctrl->num_down_channels = buf_get_u32(buf + RTT_CB_MAX_ID_LENGTH + 4,
0, 32);
return ERROR_OK;
}
int target_rtt_find_control_block(struct target *target,
target_addr_t *address, size_t size, const char *id, bool *found,
void *user_data)
{
target_addr_t address_end = *address + size;
uint8_t buf[1024];
*found = false;
size_t id_matched_length = 0;
const size_t id_length = strlen(id);
LOG_INFO("rtt: Searching for control block '%s'", id);
for (target_addr_t addr = *address; addr < address_end; addr += sizeof(buf)) {
int ret;
const size_t buf_size = MIN(sizeof(buf), address_end - addr);
ret = target_read_buffer(target, addr, buf_size, buf);
if (ret != ERROR_OK)
return ret;
for (size_t buf_off = 0; buf_off < buf_size; buf_off++) {
if (id_matched_length > 0 &&
buf[buf_off] != id[id_matched_length]) {
/* Start from beginning */
id_matched_length = 0;
}
if (buf[buf_off] == id[id_matched_length])
id_matched_length++;
if (id_matched_length == id_length) {
*address = addr + buf_off + 1 - id_length;
*found = true;
return ERROR_OK;
}
}
}
return ERROR_OK;
}
int target_rtt_read_channel_info(struct target *target,
const struct rtt_control *ctrl, unsigned int channel_index,
enum rtt_channel_type type, struct rtt_channel_info *info,
void *user_data)
{
int ret;
struct rtt_channel channel;
ret = read_rtt_channel(target, ctrl, channel_index, type, &channel);
if (ret != ERROR_OK) {
LOG_ERROR("rtt: Failed to read channel %u description",
channel_index);
return ret;
}
ret = read_channel_name(target, channel.name_addr, info->name,
info->name_length);
if (ret != ERROR_OK)
return ret;
info->size = channel.size;
info->flags = channel.flags;
return ERROR_OK;
}
static int read_from_channel(struct target *target,
const struct rtt_channel *channel, uint8_t *buffer,
size_t *length)
{
int ret;
uint32_t len;
if (!*length)
return ERROR_OK;
if (channel->read_pos == channel->write_pos) {
len = 0;
} else if (channel->read_pos < channel->write_pos) {
len = MIN(*length, channel->write_pos - channel->read_pos);
ret = target_read_buffer(target,
channel->buffer_addr + channel->read_pos, len, buffer);
if (ret != ERROR_OK)
return ret;
} else {
uint32_t first_length;
len = MIN(*length,
channel->size - channel->read_pos + channel->write_pos);
first_length = MIN(len, channel->size - channel->read_pos);
ret = target_read_buffer(target,
channel->buffer_addr + channel->read_pos, first_length, buffer);
if (ret != ERROR_OK)
return ret;
ret = target_read_buffer(target, channel->buffer_addr,
len - first_length, buffer + first_length);
if (ret != ERROR_OK)
return ret;
}
if (len > 0) {
ret = target_write_u32(target, channel->address + 16,
(channel->read_pos + len) % channel->size);
if (ret != ERROR_OK)
return ret;
}
*length = len;
return ERROR_OK;
}
int target_rtt_read_callback(struct target *target,
const struct rtt_control *ctrl, struct rtt_sink_list **sinks,
size_t num_channels, void *user_data)
{
num_channels = MIN(num_channels, ctrl->num_up_channels);
for (size_t i = 0; i < num_channels; i++) {
int ret;
struct rtt_channel channel;
uint8_t buffer[1024];
size_t length;
if (!sinks[i])
continue;
ret = read_rtt_channel(target, ctrl, i, RTT_CHANNEL_TYPE_UP,
&channel);
if (ret != ERROR_OK) {
LOG_ERROR("rtt: Failed to read up-channel %zu description", i);
return ret;
}
if (!channel_is_active(&channel)) {
LOG_WARNING("rtt: Up-channel %zu is not active", i);
continue;
}
if (channel.size < RTT_CHANNEL_BUFFER_MIN_SIZE) {
LOG_WARNING("rtt: Up-channel %zu is not large enough", i);
continue;
}
length = sizeof(buffer);
ret = read_from_channel(target, &channel, buffer, &length);
if (ret != ERROR_OK) {
LOG_ERROR("rtt: Failed to read from up-channel %zu", i);
return ret;
}
for (struct rtt_sink_list *sink = sinks[i]; sink; sink = sink->next)
sink->read(i, buffer, length, sink->user_data);
}
return ERROR_OK;
}
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