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1e1506a2c1
go/include/link.h
Russ Cox c2dd33a46f cmd/ld: clear unused ctxt before morestack 
For non-closure functions, the context register is uninitialized
on entry and will not be used, but morestack saves it and then the
garbage collector treats it as live. This can be a source of memory
leaks if the context register points at otherwise dead memory.
Avoid this by introducing a parallel set of morestack functions
that clear the context register, and use those for the non-closure functions.

I hope this will help with some of the finalizer flakiness, but it probably won't.

Fixes #7244.

LGTM=dvyukov
R=khr, dvyukov
CC=golang-codereviews
https://golang.org/cl/71030044
2014-03-04 13:53:08 -05:00

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// Derived from Inferno utils/6l/l.h and related files.
// http://code.google.com/p/inferno-os/source/browse/utils/6l/l.h
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
typedef struct Addr Addr;
typedef struct Prog Prog;
typedef struct LSym LSym;
typedef struct Reloc Reloc;
typedef struct Auto Auto;
typedef struct Hist Hist;
typedef struct Link Link;
typedef struct Plist Plist;
typedef struct LinkArch LinkArch;
typedef struct Library Library;
typedef struct Pcln Pcln;
typedef struct Pcdata Pcdata;
typedef struct Pciter Pciter;
// prevent incompatible type signatures between liblink and 8l on Plan 9
#pragma incomplete struct Node
struct Addr
{
vlong offset;
union
{
char sval[8];
float64 dval;
Prog* branch; // for 5g, 6g, 8g
} u;
LSym* sym;
LSym* gotype;
short type;
uint8 index;
int8 scale;
int8 reg; // for 5l
int8 name; // for 5l
int8 class; // for 5l
uint8 etype; // for 5g, 6g, 8g
int32 offset2; // for 5l, 8l
struct Node* node; // for 5g, 6g, 8g
int64 width; // for 5g, 6g, 8g
};
struct Reloc
{
int32 off;
uchar siz;
uchar done;
int32 type;
int64 add;
int64 xadd;
LSym* sym;
LSym* xsym;
};
struct Prog
{
vlong pc;
int32 lineno;
Prog* link;
short as;
uchar reg; // arm only
uchar scond; // arm only
Addr from;
Addr to;
// for 5g, 6g, 8g internal use
void* opt;
// for 5l, 6l, 8l internal use
Prog* forwd;
Prog* pcond;
Prog* comefrom; // 6l, 8l
Prog* pcrel; // 5l
int32 spadj;
uchar mark;
uchar back; // 6l, 8l
char ft; /* 6l, 8l oclass cache */
char tt; // 6l, 8l
uchar optab; // 5l
uchar isize; // 6l, 8l
char width; /* fake for DATA */
char mode; /* 16, 32, or 64 in 6l, 8l; internal use in 5g, 6g, 8g */
};
// prevent incompatible type signatures between liblink and 8l on Plan 9
#pragma incomplete struct Section
struct LSym
{
char* name;
char* extname; // name used in external object files
short type;
short version;
uchar dupok;
uchar reachable;
uchar cgoexport;
uchar special;
uchar stkcheck;
uchar hide;
uchar leaf; // arm only
uchar fnptr; // arm only
uchar seenglobl;
int16 symid; // for writing .5/.6/.8 files
int32 dynid;
int32 sig;
int32 plt;
int32 got;
int32 align; // if non-zero, required alignment in bytes
int32 elfsym;
int32 args; // size of stack frame incoming arguments area
int32 locals; // size of stack frame locals area (arm only?)
vlong value;
vlong size;
LSym* hash; // in hash table
LSym* allsym; // in all symbol list
LSym* next; // in text or data list
LSym* sub; // in SSUB list
LSym* outer; // container of sub
LSym* gotype;
LSym* reachparent;
LSym* queue;
char* file;
char* dynimplib;
char* dynimpvers;
struct Section* sect;
// STEXT
Auto* autom;
Prog* text;
Prog* etext;
Pcln* pcln;
// SDATA, SBSS
uchar* p;
int32 np;
int32 maxp;
Reloc* r;
int32 nr;
int32 maxr;
};
// LSym.type
enum
{
Sxxx,
/* order here is order in output file */
/* readonly, executable */
STEXT,
SELFRXSECT,
/* readonly, non-executable */
STYPE,
SSTRING,
SGOSTRING,
SGOFUNC,
SRODATA,
SFUNCTAB,
STYPELINK,
SSYMTAB, // TODO: move to unmapped section
SPCLNTAB,
SELFROSECT,
/* writable, non-executable */
SMACHOPLT,
SELFSECT,
SMACHO, /* Mach-O __nl_symbol_ptr */
SMACHOGOT,
SNOPTRDATA,
SINITARR,
SDATA,
SWINDOWS,
SBSS,
SNOPTRBSS,
STLSBSS,
/* not mapped */
SXREF,
SMACHOSYMSTR,
SMACHOSYMTAB,
SMACHOINDIRECTPLT,
SMACHOINDIRECTGOT,
SFILE,
SFILEPATH,
SCONST,
SDYNIMPORT,
SHOSTOBJ,
SSUB = 1<<8, /* sub-symbol, linked from parent via ->sub list */
SMASK = SSUB - 1,
SHIDDEN = 1<<9, // hidden or local symbol
};
struct Auto
{
LSym* asym;
Auto* link;
int32 aoffset;
int16 type;
LSym* gotype;
};
enum
{
LINKHASH = 100003,
};
struct Hist
{
Hist* link;
char* name;
int32 line;
int32 offset;
};
struct Plist
{
LSym* name;
Prog* firstpc;
int recur;
Plist* link;
};
struct Library
{
char *objref; // object where we found the reference
char *srcref; // src file where we found the reference
char *file; // object file
char *pkg; // import path
};
struct Pcdata
{
uchar *p;
int n;
int m;
};
struct Pcln
{
Pcdata pcsp;
Pcdata pcfile;
Pcdata pcline;
Pcdata *pcdata;
int npcdata;
LSym **funcdata;
int64 *funcdataoff;
int nfuncdata;
LSym **file;
int nfile;
int mfile;
LSym *lastfile;
int lastindex;
};
// Pcdata iterator.
// for(pciterinit(&it, &pcd); !it.done; pciternext(&it)) { it.value holds in [it.pc, it.nextpc) }
struct Pciter
{
Pcdata d;
uchar *p;
uint32 pc;
uint32 nextpc;
int32 value;
int start;
int done;
};
void pciterinit(Pciter*, Pcdata*);
void pciternext(Pciter*);
// symbol version, incremented each time a file is loaded.
// version==1 is reserved for savehist.
enum
{
HistVersion = 1,
};
// Link holds the context for writing object code from a compiler
// to be linker input or for reading that input into the linker.
struct Link
{
int32 thechar; // '5' (arm), '6' (amd64), etc.
char* thestring; // full name of architecture ("arm", "amd64", ..)
int32 goarm; // for arm only, GOARM setting
int headtype;
int linkmode;
LinkArch* arch;
int32 (*ignore)(char*); // do not emit names satisfying this function
int32 debugasm; // -S flag in compiler
int32 debugline; // -L flag in compiler
int32 debughist; // -O flag in linker
int32 debugread; // -W flag in linker
int32 debugvlog; // -v flag in linker
int32 debugstack; // -K flag in linker
int32 debugzerostack; // -Z flag in linker
int32 debugdivmod; // -M flag in 5l
int32 debugfloat; // -F flag in 5l
int32 debugpcln; // -O flag in linker
int32 flag_shared; // -shared flag in linker
int32 iself;
Biobuf* bso; // for -v flag
char* pathname;
int32 windows;
// hash table of all symbols
LSym* hash[LINKHASH];
LSym* allsym;
int32 nsymbol;
// file-line history
Hist* hist;
Hist* ehist;
// all programs
Plist* plist;
Plist* plast;
// code generation
LSym* sym_div;
LSym* sym_divu;
LSym* sym_mod;
LSym* sym_modu;
LSym* symmorestack[20];
LSym* gmsym;
LSym* plan9tos;
Prog* curp;
Prog* printp;
Prog* blitrl;
Prog* elitrl;
int rexflag;
int rep; // for nacl
int repn; // for nacl
int lock; // for nacl
int asmode;
uchar* andptr;
uchar and[100];
int32 instoffset;
int32 autosize;
int32 armsize;
// for reading input files (during linker)
vlong pc;
char** libdir;
int32 nlibdir;
int32 maxlibdir;
Library* library;
int libraryp;
int nlibrary;
int tlsoffset;
void (*diag)(char*, ...);
int mode;
Auto* curauto;
Auto* curhist;
LSym* cursym;
int version;
LSym* textp;
LSym* etextp;
int32 histdepth;
int32 nhistfile;
LSym* filesyms;
};
// LinkArch is the definition of a single architecture.
struct LinkArch
{
char* name; // "arm", "amd64", and so on
int thechar; // '5', '6', and so on
void (*addstacksplit)(Link*, LSym*);
void (*assemble)(Link*, LSym*);
int (*datasize)(Prog*);
void (*follow)(Link*, LSym*);
int (*iscall)(Prog*);
int (*isdata)(Prog*);
Prog* (*prg)(void);
void (*progedit)(Link*, Prog*);
void (*settextflag)(Prog*, int);
int (*symtype)(Addr*);
int (*textflag)(Prog*);
int minlc;
int ptrsize;
int regsize;
// TODO: Give these the same values on all systems.
int D_ADDR;
int D_BRANCH;
int D_CONST;
int D_EXTERN;
int D_FCONST;
int D_NONE;
int D_PCREL;
int D_SCONST;
int D_SIZE;
int D_STATIC;
int ACALL;
int ADATA;
int AEND;
int AFUNCDATA;
int AGLOBL;
int AJMP;
int ANOP;
int APCDATA;
int ARET;
int ATEXT;
int ATYPE;
int AUSEFIELD;
};
/* executable header types */
enum {
Hunknown = 0,
Hdarwin,
Hdragonfly,
Helf,
Hfreebsd,
Hlinux,
Hnacl,
Hnetbsd,
Hopenbsd,
Hplan9,
Hsolaris,
Hwindows,
};
enum
{
LinkAuto = 0,
LinkInternal,
LinkExternal,
};
extern uchar fnuxi8[8];
extern uchar fnuxi4[4];
extern uchar inuxi1[1];
extern uchar inuxi2[2];
extern uchar inuxi4[4];
extern uchar inuxi8[8];
// asm5.c
void span5(Link *ctxt, LSym *s);
int chipfloat5(Link *ctxt, float64 e);
int chipzero5(Link *ctxt, float64 e);
// asm6.c
void span6(Link *ctxt, LSym *s);
// asm8.c
void span8(Link *ctxt, LSym *s);
// data.c
vlong addaddr(Link *ctxt, LSym *s, LSym *t);
vlong addaddrplus(Link *ctxt, LSym *s, LSym *t, vlong add);
vlong addaddrplus4(Link *ctxt, LSym *s, LSym *t, vlong add);
vlong addpcrelplus(Link *ctxt, LSym *s, LSym *t, vlong add);
Reloc* addrel(LSym *s);
vlong addsize(Link *ctxt, LSym *s, LSym *t);
vlong adduint16(Link *ctxt, LSym *s, uint16 v);
vlong adduint32(Link *ctxt, LSym *s, uint32 v);
vlong adduint64(Link *ctxt, LSym *s, uint64 v);
vlong adduint8(Link *ctxt, LSym *s, uint8 v);
vlong adduintxx(Link *ctxt, LSym *s, uint64 v, int wid);
void mangle(char *file);
void savedata(Link *ctxt, LSym *s, Prog *p, char *pn);
vlong setaddr(Link *ctxt, LSym *s, vlong off, LSym *t);
vlong setaddrplus(Link *ctxt, LSym *s, vlong off, LSym *t, vlong add);
vlong setuint16(Link *ctxt, LSym *s, vlong r, uint16 v);
vlong setuint32(Link *ctxt, LSym *s, vlong r, uint32 v);
vlong setuint64(Link *ctxt, LSym *s, vlong r, uint64 v);
vlong setuint8(Link *ctxt, LSym *s, vlong r, uint8 v);
vlong setuintxx(Link *ctxt, LSym *s, vlong off, uint64 v, vlong wid);
void symgrow(Link *ctxt, LSym *s, vlong siz);
// go.c
void double2ieee(uint64 *ieee, double native);
void* emallocz(long n);
void* erealloc(void *p, long n);
char* estrdup(char *p);
char* expandpkg(char *t0, char *pkg);
// ld.c
void addhist(Link *ctxt, int32 line, int type);
void addlib(Link *ctxt, char *src, char *obj, char *path);
void addlibpath(Link *ctxt, char *srcref, char *objref, char *file, char *pkg);
void collapsefrog(Link *ctxt, LSym *s);
void copyhistfrog(Link *ctxt, char *buf, int nbuf);
int find1(int32 l, int c);
void linkgetline(Link *ctxt, int32 line, LSym **f, int32 *l);
void histtoauto(Link *ctxt);
void mkfwd(LSym*);
void nuxiinit(void);
void savehist(Link *ctxt, int32 line, int32 off);
Prog* copyp(Link*, Prog*);
Prog* appendp(Link*, Prog*);
vlong atolwhex(char*);
// list[568].c
void listinit5(void);
void listinit6(void);
void listinit8(void);
// obj.c
int linklinefmt(Link *ctxt, Fmt *fp);
void linklinehist(Link *ctxt, int lineno, char *f, int offset);
Plist* linknewplist(Link *ctxt);
void linkprfile(Link *ctxt, int32 l);
// objfile.c
void ldobjfile(Link *ctxt, Biobuf *b, char *pkg, int64 len, char *path);
void linkwriteobj(Link *ctxt, Biobuf *b);
// pass.c
Prog* brchain(Link *ctxt, Prog *p);
Prog* brloop(Link *ctxt, Prog *p);
void linkpatch(Link *ctxt, LSym *sym);
// pcln.c
void linkpcln(Link*, LSym*);
// sym.c
LSym* linklookup(Link *ctxt, char *name, int v);
Link* linknew(LinkArch*);
LSym* linknewsym(Link *ctxt, char *symb, int v);
LSym* linkrlookup(Link *ctxt, char *name, int v);
int linksymfmt(Fmt *f);
int headtype(char*);
char* headstr(int);
extern char* anames5[];
extern char* anames6[];
extern char* anames8[];
extern LinkArch link386;
extern LinkArch linkamd64;
extern LinkArch linkamd64p32;
extern LinkArch linkarm;
#pragma varargck type "A" int
#pragma varargck type "D" Addr*
#pragma varargck type "lD" Addr*
#pragma varargck type "P" Prog*
#pragma varargck type "R" int
// TODO(ality): remove this workaround.
// It's here because Pconv in liblink/list?.c references %L.
#pragma varargck type "L" int32
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