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// Bionic-specific support for sections.
// Copyright (C) 2019-2020 Free Software Foundation, Inc.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
module gcc.sections.android;
version (CRuntime_Bionic):
// debug = PRINTF;
debug(PRINTF) import core.stdc.stdio;
import core.stdc.stdlib : malloc, free;
import rt.deh, rt.minfo;
import core.sys.posix.pthread;
import core.stdc.stdlib : calloc;
import core.stdc.string : memcpy;
struct SectionGroup
{
static int opApply(scope int delegate(ref SectionGroup) dg)
{
return dg(_sections);
}
static int opApplyReverse(scope int delegate(ref SectionGroup) dg)
{
return dg(_sections);
}
@property immutable(ModuleInfo*)[] modules() const nothrow @nogc
{
return _moduleGroup.modules;
}
@property ref inout(ModuleGroup) moduleGroup() inout nothrow @nogc
{
return _moduleGroup;
}
@property immutable(FuncTable)[] ehTables() const nothrow @nogc
{
auto pbeg = cast(immutable(FuncTable)*)&__start_deh;
auto pend = cast(immutable(FuncTable)*)&__stop_deh;
return pbeg[0 .. pend - pbeg];
}
@property inout(void[])[] gcRanges() inout nothrow @nogc
{
return _gcRanges[];
}
private:
ModuleGroup _moduleGroup;
void[][1] _gcRanges;
}
void initSections() nothrow @nogc
{
pthread_key_create(&_tlsKey, null);
auto mbeg = cast(immutable ModuleInfo**)&__start_minfo;
auto mend = cast(immutable ModuleInfo**)&__stop_minfo;
_sections.moduleGroup = ModuleGroup(mbeg[0 .. mend - mbeg]);
auto pbeg = cast(void*)&_tlsend;
auto pend = cast(void*)&__bss_end__;
// _tlsend is a 32-bit int and may not be 64-bit void*-aligned, so align pbeg.
version (D_LP64) pbeg = cast(void*)(cast(size_t)(pbeg + 7) & ~cast(size_t)7);
_sections._gcRanges[0] = pbeg[0 .. pend - pbeg];
}
void finiSections() nothrow @nogc
{
pthread_key_delete(_tlsKey);
}
void[]* initTLSRanges() nothrow @nogc
{
return &getTLSBlock();
}
void finiTLSRanges(void[]* rng) nothrow @nogc
{
.free(rng.ptr);
.free(rng);
}
void scanTLSRanges(void[]* rng, scope void delegate(void* pbeg, void* pend) nothrow dg) nothrow
{
dg(rng.ptr, rng.ptr + rng.length);
}
/* NOTE: The Bionic C library ignores thread-local data stored in the normal
* .tbss/.tdata ELF sections, which are marked with the SHF_TLS/STT_TLS
* flags. So instead we roll our own by keeping TLS data in the
* .tdata/.tbss sections but removing the SHF_TLS/STT_TLS flags, and
* access the TLS data using this function and the _tlsstart/_tlsend
* symbols as delimiters.
*
* This function is called by the code emitted by the compiler. It
* is expected to translate an address in the TLS static data to
* the corresponding address in the TLS dynamic per-thread data.
*/
extern(C) void* __tls_get_addr( void* p ) nothrow @nogc
{
debug(PRINTF) printf(" __tls_get_addr input - %p\n", p);
immutable offset = cast(size_t)(p - cast(void*)&_tlsstart);
auto tls = getTLSBlockAlloc();
assert(offset < tls.length);
return tls.ptr + offset;
}
private:
__gshared pthread_key_t _tlsKey;
ref void[] getTLSBlock() nothrow @nogc
{
auto pary = cast(void[]*)pthread_getspecific(_tlsKey);
if (pary is null)
{
pary = cast(void[]*).calloc(1, (void[]).sizeof);
if (pthread_setspecific(_tlsKey, pary) != 0)
{
import core.stdc.stdio;
perror("pthread_setspecific failed with");
assert(0);
}
}
return *pary;
}
ref void[] getTLSBlockAlloc() nothrow @nogc
{
auto pary = &getTLSBlock();
if (!pary.length)
{
auto pbeg = cast(void*)&_tlsstart;
auto pend = cast(void*)&_tlsend;
auto p = .malloc(pend - pbeg);
memcpy(p, pbeg, pend - pbeg);
*pary = p[0 .. pend - pbeg];
}
return *pary;
}
__gshared SectionGroup _sections;
extern(C)
{
/* Symbols created by the compiler/linker and inserted into the
* object file that 'bracket' sections.
*/
extern __gshared
{
void* __start_deh;
void* __stop_deh;
void* __start_minfo;
void* __stop_minfo;
size_t __bss_end__;
int _tlsstart;
int _tlsend;
}
}
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