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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "platform.h"
#include "PlatformMacros.h"
#include "LulMain.h"
#include "shared-libraries.h"
#include "AutoObjectMapper.h"
// Contains miscellaneous helpers that are used to connect SPS and LUL.
// Find out, in a platform-dependent way, where the code modules got
// mapped in the process' virtual address space, and get |aLUL| to
// load unwind info for them.
void
read_procmaps(lul::LUL* aLUL)
{
MOZ_ASSERT(aLUL->CountMappings() == 0);
# if defined(SPS_OS_linux) || defined(SPS_OS_android) || defined(SPS_OS_darwin)
SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();
for (size_t i = 0; i < info.GetSize(); i++) {
const SharedLibrary& lib = info.GetEntry(i);
# if defined(SPS_OS_android)
// We're using faulty.lib. Use a special-case object mapper.
AutoObjectMapperFaultyLib mapper(aLUL->mLog);
# else
// We can use the standard POSIX-based mapper.
AutoObjectMapperPOSIX mapper(aLUL->mLog);
# endif
// Ask |mapper| to map the object. Then hand its mapped address
// to NotifyAfterMap().
void* image = nullptr;
size_t size = 0;
bool ok = mapper.Map(&image, &size, lib.GetName());
if (ok && image && size > 0) {
aLUL->NotifyAfterMap(lib.GetStart(), lib.GetEnd()-lib.GetStart(),
lib.GetName().c_str(), image);
} else if (!ok && lib.GetName() == "") {
// The object has no name and (as a consequence) the mapper
// failed to map it. This happens on Linux, where
// GetInfoForSelf() produces two such mappings: one for the
// executable and one for the VDSO. The executable one isn't a
// big deal since there's not much interesting code in there,
// but the VDSO one is a problem on x86-{linux,android} because
// lack of knowledge about the mapped area inhibits LUL's
// special __kernel_syscall handling. Hence notify |aLUL| at
// least of the mapping, even though it can't read any unwind
// information for the area.
aLUL->NotifyExecutableArea(lib.GetStart(), lib.GetEnd()-lib.GetStart());
}
// |mapper| goes out of scope at this point and so its destructor
// unmaps the object.
}
# else
# error "Unknown platform"
# endif
}
// LUL needs a callback for its logging sink.
void
logging_sink_for_LUL(const char* str) {
// Ignore any trailing \n, since LOG will add one anyway.
size_t n = strlen(str);
if (n > 0 && str[n-1] == '\n') {
char* tmp = strdup(str);
tmp[n-1] = 0;
LOG(tmp);
free(tmp);
} else {
LOG(str);
}
}
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