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/*
* Copyright (c) 2016 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "kern/linux/helpers.hh"
#include "config/the_isa.hh"
#include "cpu/thread_context.hh"
#include "mem/port_proxy.hh"
#include "sim/byteswap.hh"
#include "sim/system.hh"
struct M5_ATTR_PACKED DmesgEntry {
uint64_t ts_nsec;
uint16_t len;
uint16_t text_len;
uint16_t dict_len;
uint8_t facility;
uint8_t flags;
};
static int
dumpDmesgEntry(const uint8_t *base, const uint8_t *end, const ByteOrder bo,
std::ostream &os)
{
const size_t max_length = end - base;
DmesgEntry de;
if (max_length < sizeof(de)) {
warn("Malformed dmesg entry\n");
return -1;
}
memcpy(&de, base, sizeof(de));
de.ts_nsec = gtoh(de.ts_nsec, bo);
de.len = gtoh(de.len, bo);
de.text_len = gtoh(de.text_len, bo);
if (de.len < sizeof(de) ||
max_length < de.len ||
max_length < sizeof(DmesgEntry) + de.text_len) {
warn("Malformed dmesg entry:\n");
warn("\tMax length: %i\n", max_length);
warn("\tde.len: %i\n", de.len);
warn("\tde.text_len: %i\n", de.text_len);
return -1;
}
ccprintf(os, "[%.6f] ", de.ts_nsec * 10e-9);
os.write((char *)base + sizeof(de), de.text_len);
os << std::endl;
return de.len;
}
void
Linux::dumpDmesg(ThreadContext *tc, std::ostream &os)
{
System *system = tc->getSystemPtr();
const ByteOrder bo = system->getGuestByteOrder();
const auto &symtab = system->workload->symtab(tc);
PortProxy &proxy = tc->getVirtProxy();
auto lb = symtab.find("__log_buf");
auto lb_len = symtab.find("log_buf_len");
auto first = symtab.find("log_first_idx");
auto next = symtab.find("log_next_idx");
auto end_it = symtab.end();
if (lb == end_it || lb_len == end_it ||
first == end_it || next == end_it) {
warn("Failed to find kernel dmesg symbols.\n");
return;
}
uint32_t log_buf_len = proxy.read<uint32_t>(lb_len->address, bo);
uint32_t log_first_idx = proxy.read<uint32_t>(first->address, bo);
uint32_t log_next_idx = proxy.read<uint32_t>(next->address, bo);
if (log_first_idx >= log_buf_len || log_next_idx >= log_buf_len) {
warn("dmesg pointers/length corrupted\n");
return;
}
// Normalize and read the dmesg ring buffer
std::vector<uint8_t> log_buf(log_buf_len);
int length;
if (log_first_idx < log_next_idx) {
length = log_next_idx - log_first_idx;
if (length < 0 || length > log_buf.size()) {
warn("Unexpected dmesg buffer length\n");
return;
}
proxy.readBlob(lb->address + log_first_idx, log_buf.data(), length);
} else {
const int length_2 = log_buf_len - log_first_idx;
if (length_2 < 0 || length_2 + log_next_idx > log_buf.size()) {
warn("Unexpected dmesg buffer length\n");
return;
}
length = log_buf_len;
proxy.readBlob(lb->address + log_first_idx, log_buf.data(), length_2);
proxy.readBlob(lb->address, log_buf.data() + length_2, log_next_idx);
}
// Print dmesg buffer content
const uint8_t *cur = log_buf.data(), *end = log_buf.data() + length;
while (cur < end) {
int ret = dumpDmesgEntry(cur, end, bo, os);
if (ret < 0)
return;
cur += ret;
}
}