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ftmemsim-valgrind/include/vg_skin.h
Nicholas Nethercote b8faaa5488 [Julian, you might like to check these changes] 
Fixed demangler bug -- it was relying on glibc for some functions.  This
triggered an incredibly obscure bug in my experimental skin -- memcpy() was
called within the demangler at (about?) the same time as the dynamic linker was
fiddling with the memcpy() entry, which caused one word of memory (probably
some counter in the dynamic linker) to be incremented, which my skin didn't
like.

So I removed all (AFAICT) of the demangler's dependencies on glibc.  This
required adding macros for memset, memcpy, strlen, strcmp..., to replace them
with their VG_(...) version.  The only #includes now are to .h files that are
part of Valgrind.

Also required #defining "size_t" as "Int".

Also required adding VG_(memcmp)() to vg_mylibc.c.

Also removed the "-1 == EOF" part of the compile-time test in safe-ctype.h
that checks the character set is ASCII.  This was to remove the dependency
on stdio.h.  Slightly dodgy, but should be ok I think/hope.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1436
2003-02-24 10:49:08 +00:00

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/*--------------------------------------------------------------------*/
/*--- The only header your skin will ever need to #include... ---*/
/*--- vg_skin.h ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an extensible x86 protected-mode
emulator for monitoring program execution on x86-Unixes.
Copyright (C) 2000-2002 Julian Seward
jseward@acm.org
This program 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 2 of the
License, or (at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#ifndef __VG_SKIN_H
#define __VG_SKIN_H
#include <stdarg.h> /* ANSI varargs stuff */
#include <setjmp.h> /* for jmp_buf */
#include "vg_constants_skin.h"
/*====================================================================*/
/*=== Build options and table sizes. ===*/
/*====================================================================*/
/* You should be able to change these options or sizes, recompile, and
still have a working system. */
/* The maximum number of pthreads that we support. This is
deliberately not very high since our implementation of some of the
scheduler algorithms is surely O(N) in the number of threads, since
that's simple, at least. And (in practice) we hope that most
programs do not need many threads. */
#define VG_N_THREADS 50
/* Maximum number of pthread keys available. Again, we start low until
the need for a higher number presents itself. */
#define VG_N_THREAD_KEYS 50
/* Total number of integer registers available for allocation -- all of
them except %esp, %ebp. %ebp permanently points at VG_(baseBlock).
If you increase this you'll have to also change at least these:
- VG_(rank_to_realreg)()
- VG_(realreg_to_rank)()
- ppRegsLiveness()
- the RegsLive type (maybe -- RegsLive type must have more than
VG_MAX_REALREGS bits)
You can decrease it, and performance will drop because more spills will
occur. If you decrease it too much, everything will fall over.
Do not change this unless you really know what you are doing! */
#define VG_MAX_REALREGS 6
/*====================================================================*/
/*=== Basic types, useful macros ===*/
/*====================================================================*/
typedef unsigned char UChar;
typedef unsigned short UShort;
typedef unsigned int UInt;
typedef unsigned long long int ULong;
typedef signed char Char;
typedef signed short Short;
typedef signed int Int;
typedef signed long long int Long;
typedef unsigned int Addr;
typedef unsigned char Bool;
#define False ((Bool)0)
#define True ((Bool)1)
#define mycat_wrk(aaa,bbb) aaa##bbb
#define mycat(aaa,bbb) mycat_wrk(aaa,bbb)
/* No, really. I _am_ that strange. */
#define OINK(nnn) VG_(message)(Vg_DebugMsg, "OINK %d",nnn)
/* ---------------------------------------------------------------------
Now the basic types are set up, we can haul in the kernel-interface
definitions.
------------------------------------------------------------------ */
#include "../coregrind/vg_kerneliface.h"
/*====================================================================*/
/*=== Core/skin interface version ===*/
/*====================================================================*/
/* The major version number indicates binary-incompatible changes to the
interface; if the core and skin major versions don't match, Valgrind
will abort. The minor version indicates binary-compatible changes.
*/
#define VG_CORE_INTERFACE_MAJOR_VERSION 1
#define VG_CORE_INTERFACE_MINOR_VERSION 2
extern const Int VG_(skin_interface_major_version);
extern const Int VG_(skin_interface_minor_version);
/* Every skin must include this macro somewhere, exactly once. */
#define VG_DETERMINE_INTERFACE_VERSION \
const Int VG_(skin_interface_major_version) = VG_CORE_INTERFACE_MAJOR_VERSION; \
const Int VG_(skin_interface_minor_version) = VG_CORE_INTERFACE_MINOR_VERSION;
/*====================================================================*/
/*=== Command-line options ===*/
/*====================================================================*/
/* Verbosity level: 0 = silent, 1 (default), > 1 = more verbose. */
extern Int VG_(clo_verbosity);
/* Profile? */
extern Bool VG_(clo_profile);
/* Call this if a recognised option was bad for some reason.
Note: don't use it just because an option was unrecognised -- return 'False'
from SKN_(process_cmd_line_option) to indicate that. */
extern void VG_(bad_option) ( Char* opt );
/* Client args */
extern Int VG_(client_argc);
extern Char** VG_(client_argv);
/* Client environment. Can be inspected with VG_(getenv)() */
extern Char** VG_(client_envp);
/*====================================================================*/
/*=== Printing messages for the user ===*/
/*====================================================================*/
/* Print a message prefixed by "??<pid>?? "; '?' depends on the VgMsgKind.
Should be used for all user output. */
typedef
enum { Vg_UserMsg, /* '?' == '=' */
Vg_DebugMsg, /* '?' == '-' */
Vg_DebugExtraMsg /* '?' == '+' */
}
VgMsgKind;
/* Functions for building a message from multiple parts. */
extern void VG_(start_msg) ( VgMsgKind kind );
extern void VG_(add_to_msg) ( Char* format, ... );
/* Ends and prints the message. Appends a newline. */
extern void VG_(end_msg) ( void );
/* Send a single-part message. Appends a newline. */
extern void VG_(message) ( VgMsgKind kind, Char* format, ... );
/*====================================================================*/
/*=== Profiling ===*/
/*====================================================================*/
/* Nb: VGP_(register_profile_event)() relies on VgpUnc being the first one */
#define VGP_CORE_LIST \
/* These ones depend on the core */ \
VGP_PAIR(VgpUnc, "unclassified"), \
VGP_PAIR(VgpRun, "running"), \
VGP_PAIR(VgpSched, "scheduler"), \
VGP_PAIR(VgpMalloc, "low-lev malloc/free"), \
VGP_PAIR(VgpCliMalloc, "client malloc/free"), \
VGP_PAIR(VgpStack, "adjust-stack"), \
VGP_PAIR(VgpTranslate, "translate-main"), \
VGP_PAIR(VgpToUCode, "to-ucode"), \
VGP_PAIR(VgpFromUcode, "from-ucode"), \
VGP_PAIR(VgpImprove, "improve"), \
VGP_PAIR(VgpRegAlloc, "reg-alloc"), \
VGP_PAIR(VgpLiveness, "liveness-analysis"), \
VGP_PAIR(VgpDoLRU, "do-lru"), \
VGP_PAIR(VgpSlowFindT, "slow-search-transtab"), \
VGP_PAIR(VgpInitMem, "init-memory"), \
VGP_PAIR(VgpExeContext, "exe-context"), \
VGP_PAIR(VgpReadSyms, "read-syms"), \
VGP_PAIR(VgpSearchSyms, "search-syms"), \
VGP_PAIR(VgpAddToT, "add-to-transtab"), \
VGP_PAIR(VgpCoreSysWrap, "core-syscall-wrapper"), \
VGP_PAIR(VgpDemangle, "demangle"), \
VGP_PAIR(VgpCoreCheapSanity, "core-cheap-sanity"), \
VGP_PAIR(VgpCoreExpensiveSanity, "core-expensive-sanity"), \
/* These ones depend on the skin */ \
VGP_PAIR(VgpPreCloInit, "pre-clo-init"), \
VGP_PAIR(VgpPostCloInit, "post-clo-init"), \
VGP_PAIR(VgpInstrument, "instrument"), \
VGP_PAIR(VgpSkinSysWrap, "skin-syscall-wrapper"), \
VGP_PAIR(VgpSkinCheapSanity, "skin-cheap-sanity"), \
VGP_PAIR(VgpSkinExpensiveSanity, "skin-expensive-sanity"), \
VGP_PAIR(VgpFini, "fini")
#define VGP_PAIR(n,name) n
typedef enum { VGP_CORE_LIST } VgpCoreCC;
#undef VGP_PAIR
/* When registering skin profiling events, ensure that the 'n' value is in
* the range (VgpFini+1..) */
extern void VGP_(register_profile_event) ( Int n, Char* name );
extern void VGP_(pushcc) ( UInt cc );
extern void VGP_(popcc) ( UInt cc );
/* Define them only if they haven't already been defined by vg_profile.c */
#ifndef VGP_PUSHCC
# define VGP_PUSHCC(x)
#endif
#ifndef VGP_POPCC
# define VGP_POPCC(x)
#endif
/*====================================================================*/
/*=== Useful stuff to call from generated code ===*/
/*====================================================================*/
/* ------------------------------------------------------------------ */
/* General stuff */
/* 64-bit counter for the number of basic blocks done. */
extern ULong VG_(bbs_done);
/* Get the simulated %esp */
extern Addr VG_(get_stack_pointer) ( void );
/* Detect if an address is within Valgrind's stack or Valgrind's
m_state_static; useful for memory leak detectors to tell if a block
is used by Valgrind (and thus can be ignored). */
extern Bool VG_(within_stack)(Addr a);
extern Bool VG_(within_m_state_static)(Addr a);
/* Check if an address is 4-byte aligned */
#define IS_ALIGNED4_ADDR(aaa_p) (0 == (((UInt)(aaa_p)) & 3))
/* ------------------------------------------------------------------ */
/* Thread-related stuff */
/* Special magic value for an invalid ThreadId. It corresponds to
LinuxThreads using zero as the initial value for
pthread_mutex_t.__m_owner and pthread_cond_t.__c_waiting. */
#define VG_INVALID_THREADID ((ThreadId)(0))
/* ThreadIds are simply indices into the vg_threads[] array. */
typedef
UInt
ThreadId;
/* struct _ThreadState defined elsewhere; ThreadState is abstract as its
definition is not important for skins. */
typedef
struct _ThreadState
ThreadState;
extern ThreadId VG_(get_current_tid) ( void );
extern ThreadId VG_(get_current_or_recent_tid) ( void );
extern ThreadId VG_(get_tid_from_ThreadState) ( ThreadState* );
extern ThreadState* VG_(get_ThreadState) ( ThreadId tid );
/*====================================================================*/
/*=== Valgrind's version of libc ===*/
/*====================================================================*/
/* Valgrind doesn't use libc at all, for good reasons (trust us). So here
are its own versions of C library functions, but with VG_ prefixes. Note
that the types of some are slightly different to the real ones. Some
additional useful functions are provided too; descriptions of how they
work are given below. */
#if !defined(NULL)
# define NULL ((void*)0)
#endif
/* ------------------------------------------------------------------ */
/* stdio.h
*
* Note that they all output to the file descriptor given by the
* --logfile-fd=N argument, which defaults to 2 (stderr). Hence no
* need for VG_(fprintf)().
*/
extern UInt VG_(printf) ( const char *format, ... );
/* too noisy ... __attribute__ ((format (printf, 1, 2))) ; */
extern UInt VG_(sprintf) ( Char* buf, Char *format, ... );
extern UInt VG_(vprintf) ( void(*send)(Char),
const Char *format, va_list vargs );
extern Int VG_(rename) ( Char* old_name, Char* new_name );
/* ------------------------------------------------------------------ */
/* stdlib.h */
extern void* VG_(malloc) ( Int nbytes );
extern void VG_(free) ( void* p );
extern void* VG_(calloc) ( Int n, Int nbytes );
extern void* VG_(realloc) ( void* p, Int size );
extern void* VG_(malloc_aligned) ( Int align_bytes, Int nbytes );
extern void VG_(print_malloc_stats) ( void );
extern void VG_(exit)( Int status )
__attribute__ ((__noreturn__));
/* Prints a panic message (a constant string), appends newline and bug
reporting info, aborts. */
__attribute__ ((__noreturn__))
extern void VG_(skin_panic) ( Char* str );
/* Looks up VG_(client_envp) */
extern Char* VG_(getenv) ( Char* name );
/* Crude stand-in for the glibc system() call. */
extern Int VG_(system) ( Char* cmd );
extern Long VG_(atoll) ( Char* str );
/* Like atoll(), but converts a number of base 2..36 */
extern Long VG_(atoll36) ( UInt base, Char* str );
/* ------------------------------------------------------------------ */
/* ctype.h */
extern Bool VG_(isspace) ( Char c );
extern Bool VG_(isdigit) ( Char c );
extern Char VG_(toupper) ( Char c );
/* ------------------------------------------------------------------ */
/* string.h */
extern Int VG_(strlen) ( const Char* str );
extern Char* VG_(strcat) ( Char* dest, const Char* src );
extern Char* VG_(strncat) ( Char* dest, const Char* src, Int n );
extern Char* VG_(strpbrk) ( const Char* s, const Char* accept );
extern Char* VG_(strcpy) ( Char* dest, const Char* src );
extern Char* VG_(strncpy) ( Char* dest, const Char* src, Int ndest );
extern Int VG_(strcmp) ( const Char* s1, const Char* s2 );
extern Int VG_(strncmp) ( const Char* s1, const Char* s2, Int nmax );
extern Char* VG_(strstr) ( const Char* haystack, Char* needle );
extern Char* VG_(strchr) ( const Char* s, Char c );
extern Char* VG_(strdup) ( const Char* s);
extern void* VG_(memcpy) ( void *d, const void *s, Int sz );
extern void* VG_(memset) ( void *s, Int c, Int sz );
extern Int VG_(memcmp) ( const void* s1, const void* s2, Int n );
/* Like strcmp() and strncmp(), but stop comparing at any whitespace. */
extern Int VG_(strcmp_ws) ( const Char* s1, const Char* s2 );
extern Int VG_(strncmp_ws) ( const Char* s1, const Char* s2, Int nmax );
/* Like strncpy(), but if 'src' is longer than 'ndest' inserts a '\0' as the
last character. */
extern void VG_(strncpy_safely) ( Char* dest, const Char* src, Int ndest );
/* Mini-regexp function. Searches for 'pat' in 'str'. Supports
* meta-symbols '*' and '?'. '\' escapes meta-symbols. */
extern Bool VG_(string_match) ( Char* pat, Char* str );
/* ------------------------------------------------------------------ */
/* math.h */
/* Returns the base-2 logarithm of x. */
extern Int VG_(log2) ( Int x );
/* ------------------------------------------------------------------ */
/* unistd.h, fcntl.h, sys/stat.h */
extern Int VG_(getpid) ( void );
extern Int VG_(getppid) ( void );
extern Int VG_(open) ( const Char* pathname, Int flags, Int mode );
extern Int VG_(read) ( Int fd, void* buf, Int count);
extern Int VG_(write) ( Int fd, void* buf, Int count);
extern void VG_(close) ( Int fd );
/* Nb: VG_(rename)() declared in stdio.h section above */
extern Int VG_(unlink) ( Char* file_name );
extern Int VG_(stat) ( Char* file_name, struct vki_stat* buf );
/* ------------------------------------------------------------------ */
/* assert.h */
/* Asserts permanently enabled -- no turning off with NDEBUG. Hurrah! */
#define VG__STRING(__str) #__str
#define sk_assert(expr) \
((void) ((expr) ? 0 : \
(VG_(skin_assert_fail) (VG__STRING(expr), \
__FILE__, __LINE__, \
__PRETTY_FUNCTION__), 0)))
__attribute__ ((__noreturn__))
extern void VG_(skin_assert_fail) ( Char* expr, Char* file,
Int line, Char* fn );
/* ------------------------------------------------------------------ */
/* system/mman.h */
extern void* VG_(mmap)( void* start, UInt length,
UInt prot, UInt flags, UInt fd, UInt offset );
extern Int VG_(munmap)( void* start, Int length );
/* Get memory by anonymous mmap. */
extern void* VG_(get_memory_from_mmap) ( Int nBytes, Char* who );
/* ------------------------------------------------------------------ */
/* signal.h.
Note that these use the vk_ (kernel) structure
definitions, which are different in places from those that glibc
defines -- hence the 'k' prefix. Since we're operating right at the
kernel interface, glibc's view of the world is entirely irrelevant. */
/* --- Signal set ops --- */
extern Int VG_(ksigfillset) ( vki_ksigset_t* set );
extern Int VG_(ksigemptyset) ( vki_ksigset_t* set );
extern Bool VG_(kisfullsigset) ( vki_ksigset_t* set );
extern Bool VG_(kisemptysigset) ( vki_ksigset_t* set );
extern Int VG_(ksigaddset) ( vki_ksigset_t* set, Int signum );
extern Int VG_(ksigdelset) ( vki_ksigset_t* set, Int signum );
extern Int VG_(ksigismember) ( vki_ksigset_t* set, Int signum );
extern void VG_(ksigaddset_from_set) ( vki_ksigset_t* dst, vki_ksigset_t* src );
extern void VG_(ksigdelset_from_set) ( vki_ksigset_t* dst, vki_ksigset_t* src );
/* --- Mess with the kernel's sig state --- */
extern Int VG_(ksigprocmask) ( Int how, const vki_ksigset_t* set,
vki_ksigset_t* oldset );
extern Int VG_(ksigaction) ( Int signum,
const vki_ksigaction* act,
vki_ksigaction* oldact );
extern Int VG_(ksignal) ( Int signum, void (*sighandler)(Int) );
extern Int VG_(ksigaltstack) ( const vki_kstack_t* ss, vki_kstack_t* oss );
extern Int VG_(kkill) ( Int pid, Int signo );
extern Int VG_(ksigpending) ( vki_ksigset_t* set );
/*====================================================================*/
/*=== UCode definition ===*/
/*====================================================================*/
/* Tags which describe what operands are. Must fit into 4 bits, which
they clearly do. */
typedef
enum { TempReg =0, /* virtual temp-reg */
ArchReg =1, /* simulated integer reg */
ArchRegS =2, /* simulated segment reg */
RealReg =3, /* real machine's real reg */
SpillNo =4, /* spill slot location */
Literal =5, /* literal; .lit32 field has actual value */
Lit16 =6, /* literal; .val[123] field has actual value */
NoValue =7 /* operand not in use */
}
Tag;
/* Invalid register numbers (can't be negative) */
#define INVALID_TEMPREG 999999999
#define INVALID_REALREG 999999999
/* Microinstruction opcodes. */
typedef
enum {
NOP, /* Null op */
LOCK, /* Indicate the existance of a LOCK prefix (functionally NOP) */
/* Moving values around */
GET, PUT, /* simulated register <--> TempReg */
GETF, PUTF, /* simulated %eflags <--> TempReg */
LOAD, STORE, /* memory <--> TempReg */
MOV, /* TempReg <--> TempReg */
CMOV, /* Used for cmpxchg and cmov */
/* Arithmetic/logical ops */
ADD, ADC, SUB, SBB, /* Add/subtract (w/wo carry) */
AND, OR, XOR, NOT, /* Boolean ops */
SHL, SHR, SAR, ROL, ROR, RCL, RCR, /* Shift/rotate (w/wo carry) */
NEG, /* Negate */
INC, DEC, /* Increment/decrement */
BSWAP, /* Big-endian <--> little-endian */
CC2VAL, /* Condition code --> 0 or 1 */
WIDEN, /* Signed or unsigned widening */
/* Conditional or unconditional jump */
JMP,
/* FPU ops */
FPU, /* Doesn't touch memory */
FPU_R, FPU_W, /* Reads/writes memory */
/* Not strictly needed, but improve address calculation translations. */
LEA1, /* reg2 := const + reg1 */
LEA2, /* reg3 := const + reg1 + reg2 * 1,2,4 or 8 */
/* Hack for x86 REP insns. Jump to literal if TempReg/RealReg is zero. */
JIFZ,
/* Advance the simulated %eip by some small (< 128) number. */
INCEIP,
/* Dealing with segment registers */
GETSEG, PUTSEG, /* simulated segment register <--> TempReg */
USESEG, /* (LDT/GDT index, virtual addr) --> linear addr */
/* Not for translating x86 calls -- only to call helpers */
CALLM_S, CALLM_E, /* Mark start/end of CALLM push/pop sequence */
PUSH, POP, CLEAR, /* Add/remove/zap args for helpers */
CALLM, /* Call assembly-code helper */
/* Not for translating x86 calls -- only to call C helper functions of
up to three arguments (or two if the functions has a return value).
Arguments and return value must be word-sized. More arguments can
be faked with global variables (eg. use VG_(set_global_var)()).
Seven possibilities: 'arg[123]' show where args go, 'ret' shows
where return value goes (if present).
CCALL(-, -, - ) void f(void)
CCALL(arg1, -, - ) void f(UInt arg1)
CCALL(arg1, arg2, - ) void f(UInt arg1, UInt arg2)
CCALL(arg1, arg2, arg3) void f(UInt arg1, UInt arg2, UInt arg3)
CCALL(-, -, ret ) UInt f(UInt)
CCALL(arg1, -, ret ) UInt f(UInt arg1)
CCALL(arg1, arg2, ret ) UInt f(UInt arg1, UInt arg2) */
CCALL,
/* This opcode makes it easy for skins that extend UCode to do this to
avoid opcode overlap:
enum { EU_OP1 = DUMMY_FINAL_UOPCODE + 1, ... }
WARNING: Do not add new opcodes after this one! They can be added
before, though. */
DUMMY_FINAL_UOPCODE
}
Opcode;
/* Condition codes, using the Intel encoding. CondAlways is an extra. */
typedef
enum {
CondO = 0, /* overflow */
CondNO = 1, /* no overflow */
CondB = 2, /* below */
CondNB = 3, /* not below */
CondZ = 4, /* zero */
CondNZ = 5, /* not zero */
CondBE = 6, /* below or equal */
CondNBE = 7, /* not below or equal */
CondS = 8, /* negative */
CondNS = 9, /* not negative */
CondP = 10, /* parity even */
CondNP = 11, /* not parity even */
CondL = 12, /* jump less */
CondNL = 13, /* not less */
CondLE = 14, /* less or equal */
CondNLE = 15, /* not less or equal */
CondAlways = 16 /* Jump always */
}
Condcode;
/* Descriptions of additional properties of *unconditional* jumps. */
typedef
enum {
JmpBoring=0, /* boring unconditional jump */
JmpCall=1, /* jump due to an x86 call insn */
JmpRet=2, /* jump due to an x86 ret insn */
JmpSyscall=3, /* do a system call, then jump */
JmpClientReq=4 /* do a client request, then jump */
}
JmpKind;
/* Flags. User-level code can only read/write O(verflow), S(ign),
Z(ero), A(ux-carry), C(arry), P(arity), and may also write
D(irection). That's a total of 7 flags. A FlagSet is a bitset,
thusly:
76543210
DOSZACP
and bit 7 must always be zero since it is unused.
Note: these Flag? values are **not** the positions in the actual
%eflags register. */
typedef UChar FlagSet;
#define FlagD (1<<6)
#define FlagO (1<<5)
#define FlagS (1<<4)
#define FlagZ (1<<3)
#define FlagA (1<<2)
#define FlagC (1<<1)
#define FlagP (1<<0)
#define FlagsOSZACP (FlagO | FlagS | FlagZ | FlagA | FlagC | FlagP)
#define FlagsOSZAP (FlagO | FlagS | FlagZ | FlagA | FlagP)
#define FlagsOSZCP (FlagO | FlagS | FlagZ | FlagC | FlagP)
#define FlagsOSACP (FlagO | FlagS | FlagA | FlagC | FlagP)
#define FlagsSZACP ( FlagS | FlagZ | FlagA | FlagC | FlagP)
#define FlagsSZAP ( FlagS | FlagZ | FlagA | FlagP)
#define FlagsZCP ( FlagZ | FlagC | FlagP)
#define FlagsOC (FlagO | FlagC )
#define FlagsAC ( FlagA | FlagC )
#define FlagsALL (FlagsOSZACP | FlagD)
#define FlagsEmpty (FlagSet)0
/* flag positions in eflags */
#define EFlagC (1 << 0) /* carry */
#define EFlagP (1 << 2) /* parity */
#define EFlagA (1 << 4) /* aux carry */
#define EFlagZ (1 << 6) /* zero */
#define EFlagS (1 << 7) /* sign */
#define EFlagD (1 << 10) /* direction */
#define EFlagO (1 << 11) /* overflow */
/* Liveness of general purpose registers, useful for code generation.
Reg rank order 0..N-1 corresponds to bits 0..N-1, ie. first
reg's liveness in bit 0, last reg's in bit N-1. Note that
these rankings don't match the Intel register ordering. */
typedef UInt RRegSet;
#define ALL_RREGS_DEAD 0 /* 0000...00b */
#define ALL_RREGS_LIVE ((1 << VG_MAX_REALREGS)-1) /* 0011...11b */
#define UNIT_RREGSET(rank) (1 << (rank))
#define IS_RREG_LIVE(rank,rregs_live) (rregs_live & UNIT_RREGSET(rank))
#define SET_RREG_LIVENESS(rank,rregs_live,b) \
do { RRegSet unit = UNIT_RREGSET(rank); \
if (b) rregs_live |= unit; \
else rregs_live &= ~unit; \
} while(0)
/* A Micro (u)-instruction. */
typedef
struct {
/* word 1 */
UInt lit32; /* 32-bit literal */
/* word 2 */
UShort val1; /* first operand */
UShort val2; /* second operand */
/* word 3 */
UShort val3; /* third operand */
UChar opcode; /* opcode */
UChar size; /* data transfer size */
/* word 4 */
FlagSet flags_r; /* :: FlagSet */
FlagSet flags_w; /* :: FlagSet */
UChar tag1:4; /* first operand tag */
UChar tag2:4; /* second operand tag */
UChar tag3:4; /* third operand tag */
UChar extra4b:4; /* Spare field, used by WIDEN for src
-size, and by LEA2 for scale (1,2,4 or 8),
and by JMPs for original x86 instr size */
/* word 5 */
UChar cond; /* condition, for jumps */
Bool signed_widen:1; /* signed or unsigned WIDEN ? */
JmpKind jmpkind:3; /* additional properties of unconditional JMP */
/* Additional properties for UInstrs that call C functions:
- CCALL
- PUT (when %ESP is the target)
- possibly skin-specific UInstrs
*/
UChar argc:2; /* Number of args, max 3 */
UChar regparms_n:2; /* Number of args passed in registers */
Bool has_ret_val:1; /* Function has return value? */
/* RealReg liveness; only sensical after reg alloc and liveness
analysis done. This info is a little bit arch-specific --
VG_MAX_REALREGS can vary on different architectures. Note that
to use this information requires converting between register ranks
and the Intel register numbers, using VG_(realreg_to_rank)()
and/or VG_(rank_to_realreg)() */
RRegSet regs_live_after:VG_MAX_REALREGS;
}
UInstr;
typedef
struct _UCodeBlock
UCodeBlock;
extern Int VG_(get_num_instrs) (UCodeBlock* cb);
extern Int VG_(get_num_temps) (UCodeBlock* cb);
extern UInstr* VG_(get_instr) (UCodeBlock* cb, Int i);
extern UInstr* VG_(get_last_instr) (UCodeBlock* cb);
/*====================================================================*/
/*=== Instrumenting UCode ===*/
/*====================================================================*/
/* Maximum number of registers read or written by a single UInstruction. */
#define VG_MAX_REGS_USED 3
/* Find what this instruction does to its regs, useful for
analysis/optimisation passes. `tag' indicates whether we're considering
TempRegs (pre-reg-alloc) or RealRegs (post-reg-alloc). `regs' is filled
with the affected register numbers, `isWrites' parallels it and indicates
if the reg is read or written. If a reg is read and written, it will
appear twice in `regs'. `regs' and `isWrites' must be able to fit
VG_MAX_REGS_USED elements. */
extern Int VG_(get_reg_usage) ( UInstr* u, Tag tag, Int* regs, Bool* isWrites );
/* Used to register helper functions to be called from generated code. A
limited number of compact helpers can be registered; the code generated
to call them is slightly shorter -- so register the mostly frequently
called helpers as compact. */
extern void VG_(register_compact_helper) ( Addr a );
extern void VG_(register_noncompact_helper) ( Addr a );
/* ------------------------------------------------------------------ */
/* Virtual register allocation */
/* Get a new virtual register */
extern Int VG_(get_new_temp) ( UCodeBlock* cb );
/* Get a new virtual shadow register */
extern Int VG_(get_new_shadow) ( UCodeBlock* cb );
/* Get a virtual register's corresponding virtual shadow register */
#define SHADOW(tempreg) ((tempreg)+1)
/* ------------------------------------------------------------------ */
/* Low-level UInstr builders */
extern void VG_(new_NOP) ( UInstr* u );
extern void VG_(new_UInstr0) ( UCodeBlock* cb, Opcode opcode, Int sz );
extern void VG_(new_UInstr1) ( UCodeBlock* cb, Opcode opcode, Int sz,
Tag tag1, UInt val1 );
extern void VG_(new_UInstr2) ( UCodeBlock* cb, Opcode opcode, Int sz,
Tag tag1, UInt val1,
Tag tag2, UInt val2 );
extern void VG_(new_UInstr3) ( UCodeBlock* cb, Opcode opcode, Int sz,
Tag tag1, UInt val1,
Tag tag2, UInt val2,
Tag tag3, UInt val3 );
/* Set read/write/undefined flags. Undefined flags are treaten as written,
but it's worth keeping them logically distinct. */
extern void VG_(set_flag_fields) ( UCodeBlock* cb, FlagSet fr, FlagSet fw,
FlagSet fu);
extern void VG_(set_lit_field) ( UCodeBlock* cb, UInt lit32 );
extern void VG_(set_ccall_fields) ( UCodeBlock* cb, Addr fn, UChar argc,
UChar regparms_n, Bool has_ret_val );
extern void VG_(set_cond_field) ( UCodeBlock* cb, Condcode code );
extern void VG_(copy_UInstr) ( UCodeBlock* cb, UInstr* instr );
extern Bool VG_(any_flag_use)( UInstr* u );
/* Macro versions of the above; just shorter to type. */
#define uInstr0 VG_(new_UInstr0)
#define uInstr1 VG_(new_UInstr1)
#define uInstr2 VG_(new_UInstr2)
#define uInstr3 VG_(new_UInstr3)
#define uLiteral VG_(set_lit_field)
#define uCCall VG_(set_ccall_fields)
#define uCond VG_(set_cond_field)
#define uFlagsRWU VG_(set_flag_fields)
#define newTemp VG_(get_new_temp)
#define newShadow VG_(get_new_shadow)
/* Refer to `the last instruction stuffed in' (can be lvalue). */
#define LAST_UINSTR(cb) (cb)->instrs[(cb)->used-1]
/* ------------------------------------------------------------------ */
/* Higher-level UInstr sequence builders */
extern void VG_(call_helper_0_0) ( UCodeBlock* cb, Addr f);
extern void VG_(call_helper_1_0) ( UCodeBlock* cb, Addr f, UInt arg1,
UInt regparms_n);
extern void VG_(call_helper_2_0) ( UCodeBlock* cb, Addr f, UInt arg1, UInt arg2,
UInt regparms_n);
/* One way around the 3-arg C function limit is to pass args via global
* variables... ugly, but it works. This one puts a literal in there. */
extern void VG_(set_global_var) ( UCodeBlock* cb, Addr globvar_ptr, UInt val);
/* This one puts the contents of a TempReg in the global variable. */
extern void VG_(set_global_var_tempreg) ( UCodeBlock* cb, Addr globvar_ptr,
UInt t_val);
/* ------------------------------------------------------------------ */
/* Allocating/freeing basic blocks of UCode */
extern UCodeBlock* VG_(setup_UCodeBlock) ( UCodeBlock* cb );
extern void VG_(free_UCodeBlock) ( UCodeBlock* cb );
/* ------------------------------------------------------------------ */
/* UCode pretty/ugly printing. Probably only useful to call from a skin
if VG_(needs).extended_UCode == True. */
/* When True, all generated code is/should be printed. */
extern Bool VG_(print_codegen);
/* Pretty/ugly printing functions */
extern void VG_(pp_UCodeBlock) ( UCodeBlock* cb, Char* title );
extern void VG_(pp_UInstr) ( Int instrNo, UInstr* u );
extern void VG_(pp_UInstr_regs) ( Int instrNo, UInstr* u );
extern void VG_(up_UInstr) ( Int instrNo, UInstr* u );
extern Char* VG_(name_UOpcode) ( Bool upper, Opcode opc );
extern Char* VG_(name_UCondcode) ( Condcode cond );
extern void VG_(pp_UOperand) ( UInstr* u, Int operandNo,
Int sz, Bool parens );
/* ------------------------------------------------------------------ */
/* Accessing archregs and their shadows */
extern UInt VG_(get_archreg) ( UInt archreg );
extern UInt VG_(get_thread_archreg) ( ThreadId tid, UInt archreg );
extern UInt VG_(get_shadow_archreg) ( UInt archreg );
extern void VG_(set_shadow_archreg) ( UInt archreg, UInt val );
extern Addr VG_(shadow_archreg_address) ( UInt archreg );
extern UInt VG_(get_thread_shadow_archreg) ( ThreadId tid, UInt archreg );
extern void VG_(set_thread_shadow_archreg) ( ThreadId tid, UInt archreg,
UInt val );
/* ------------------------------------------------------------------ */
/* Offsets of addresses of helper functions. A "helper" function is one
which is called from generated code via CALLM. */
extern Int VGOFF_(helper_idiv_64_32);
extern Int VGOFF_(helper_div_64_32);
extern Int VGOFF_(helper_idiv_32_16);
extern Int VGOFF_(helper_div_32_16);
extern Int VGOFF_(helper_idiv_16_8);
extern Int VGOFF_(helper_div_16_8);
extern Int VGOFF_(helper_imul_32_64);
extern Int VGOFF_(helper_mul_32_64);
extern Int VGOFF_(helper_imul_16_32);
extern Int VGOFF_(helper_mul_16_32);
extern Int VGOFF_(helper_imul_8_16);
extern Int VGOFF_(helper_mul_8_16);
extern Int VGOFF_(helper_CLD);
extern Int VGOFF_(helper_STD);
extern Int VGOFF_(helper_get_dirflag);
extern Int VGOFF_(helper_CLC);
extern Int VGOFF_(helper_STC);
extern Int VGOFF_(helper_shldl);
extern Int VGOFF_(helper_shldw);
extern Int VGOFF_(helper_shrdl);
extern Int VGOFF_(helper_shrdw);
extern Int VGOFF_(helper_RDTSC);
extern Int VGOFF_(helper_CPUID);
extern Int VGOFF_(helper_bsf);
extern Int VGOFF_(helper_bsr);
extern Int VGOFF_(helper_fstsw_AX);
extern Int VGOFF_(helper_SAHF);
extern Int VGOFF_(helper_DAS);
extern Int VGOFF_(helper_DAA);
/*====================================================================*/
/*=== Generating x86 code from UCode ===*/
/*====================================================================*/
/* All this only necessary for skins with VG_(needs).extends_UCode == True. */
/* This is the Intel register encoding -- integer regs. */
#define R_EAX 0
#define R_ECX 1
#define R_EDX 2
#define R_EBX 3
#define R_ESP 4
#define R_EBP 5
#define R_ESI 6
#define R_EDI 7
#define R_AL (0+R_EAX)
#define R_CL (0+R_ECX)
#define R_DL (0+R_EDX)
#define R_BL (0+R_EBX)
#define R_AH (4+R_EAX)
#define R_CH (4+R_ECX)
#define R_DH (4+R_EDX)
#define R_BH (4+R_EBX)
/* This is the Intel register encoding -- segment regs. */
#define R_ES 0
#define R_CS 1
#define R_SS 2
#define R_DS 3
#define R_FS 4
#define R_GS 5
/* For pretty printing x86 code */
extern Char* VG_(name_of_seg_reg) ( Int sreg );
extern Char* VG_(name_of_int_reg) ( Int size, Int reg );
extern Char VG_(name_of_int_size) ( Int size );
/* Shorter macros for convenience */
#define nameIReg VG_(name_of_int_reg)
#define nameISize VG_(name_of_int_size)
#define nameSReg VG_(name_of_seg_reg)
/* Randomly useful things */
extern UInt VG_(extend_s_8to32) ( UInt x );
/* Code emitters */
extern void VG_(emitB) ( UInt b );
extern void VG_(emitW) ( UInt w );
extern void VG_(emitL) ( UInt l );
extern void VG_(new_emit) ( Bool upd_cc, FlagSet uses_flags, FlagSet sets_flags );
/* Finding offsets */
extern Int VG_(helper_offset) ( Addr a );
extern Int VG_(shadow_reg_offset) ( Int arch );
extern Int VG_(shadow_flags_offset) ( void );
/* Convert reg ranks <-> Intel register ordering, for using register
liveness information. */
extern Int VG_(realreg_to_rank) ( Int realreg );
extern Int VG_(rank_to_realreg) ( Int rank );
/* Call a subroutine. Does no argument passing, stack manipulations, etc. */
extern void VG_(synth_call) ( Bool ensure_shortform, Int word_offset,
Bool upd_cc, FlagSet use_flags, FlagSet set_flags );
/* For calling C functions -- saves caller save regs, pushes args, calls,
clears the stack, restores caller save regs. `fn' must be registered in
the baseBlock first. Acceptable tags are RealReg and Literal. Optimises
things, eg. by not preserving non-live caller-save registers.
WARNING: a UInstr should *not* be translated with synth_ccall() followed
by some other x86 assembly code; this will invalidate the results of
vg_realreg_liveness_analysis() and everything will fall over. */
extern void VG_(synth_ccall) ( Addr fn, Int argc, Int regparms_n, UInt argv[],
Tag tagv[], Int ret_reg,
RRegSet regs_live_before,
RRegSet regs_live_after );
/* Addressing modes */
extern void VG_(emit_amode_offregmem_reg)( Int off, Int regmem, Int reg );
extern void VG_(emit_amode_ereg_greg) ( Int e_reg, Int g_reg );
/* v-size (4, or 2 with OSO) insn emitters */
extern void VG_(emit_movv_offregmem_reg) ( Int sz, Int off, Int areg, Int reg );
extern void VG_(emit_movv_reg_offregmem) ( Int sz, Int reg, Int off, Int areg );
extern void VG_(emit_movv_reg_reg) ( Int sz, Int reg1, Int reg2 );
extern void VG_(emit_nonshiftopv_lit_reg)( Bool upd_cc, Int sz, Opcode opc, UInt lit,
Int reg );
extern void VG_(emit_shiftopv_lit_reg) ( Bool upd_cc, Int sz, Opcode opc, UInt lit,
Int reg );
extern void VG_(emit_nonshiftopv_reg_reg)( Bool upd_cc, Int sz, Opcode opc,
Int reg1, Int reg2 );
extern void VG_(emit_movv_lit_reg) ( Int sz, UInt lit, Int reg );
extern void VG_(emit_unaryopv_reg) ( Bool upd_cc, Int sz, Opcode opc, Int reg );
extern void VG_(emit_pushv_reg) ( Int sz, Int reg );
extern void VG_(emit_popv_reg) ( Int sz, Int reg );
extern void VG_(emit_pushl_lit32) ( UInt int32 );
extern void VG_(emit_pushl_lit8) ( Int lit8 );
extern void VG_(emit_cmpl_zero_reg) ( Bool upd_cc, Int reg );
extern void VG_(emit_swapl_reg_EAX) ( Int reg );
extern void VG_(emit_movv_lit_offregmem) ( Int sz, UInt lit, Int off,
Int memreg );
/* b-size (1 byte) instruction emitters */
extern void VG_(emit_movb_lit_offregmem) ( UInt lit, Int off, Int memreg );
extern void VG_(emit_movb_reg_offregmem) ( Int reg, Int off, Int areg );
extern void VG_(emit_unaryopb_reg) ( Bool upd_cc, Opcode opc, Int reg );
extern void VG_(emit_testb_lit_reg) ( Bool upd_cc, UInt lit, Int reg );
/* zero-extended load emitters */
extern void VG_(emit_movzbl_offregmem_reg) ( Int off, Int regmem, Int reg );
extern void VG_(emit_movzwl_offregmem_reg) ( Int off, Int areg, Int reg );
/* misc instruction emitters */
extern void VG_(emit_call_reg) ( Int reg );
extern void VG_(emit_add_lit_to_esp) ( Int lit );
extern void VG_(emit_pushal) ( void );
extern void VG_(emit_popal) ( void );
extern void VG_(emit_AMD_prefetch_reg) ( Int reg );
/* jump emitters */
extern void VG_(init_target) ( Int *tgt );
extern void VG_(target_back) ( Int *tgt );
extern void VG_(target_forward) ( Int *tgt );
extern void VG_(emit_target_delta) ( Int *tgt );
extern void VG_(emit_jcondshort_delta) ( Bool simd_cc, Condcode cond, Int delta );
extern void VG_(emit_jcondshort_target)( Bool simd_cc, Condcode cond, Int *tgt );
/*====================================================================*/
/*=== Execution contexts ===*/
/*====================================================================*/
/* Generic resolution type used in a few different ways, such as deciding
how closely to compare two errors for equality. */
typedef
enum { Vg_LowRes, Vg_MedRes, Vg_HighRes }
VgRes;
typedef
struct _ExeContext
ExeContext;
/* Compare two ExeContexts. Number of callers considered depends on `res':
Vg_LowRes: 2
Vg_MedRes: 4
Vg_HighRes: all */
extern Bool VG_(eq_ExeContext) ( VgRes res,
ExeContext* e1, ExeContext* e2 );
/* Print an ExeContext. */
extern void VG_(pp_ExeContext) ( ExeContext* );
/* Take a snapshot of the client's stack. Search our collection of
ExeContexts to see if we already have it, and if not, allocate a
new one. Either way, return a pointer to the context. */
extern ExeContext* VG_(get_ExeContext) ( ThreadState *tst );
/* Just grab the client's EIP, as a much smaller and cheaper
indication of where they are. */
extern Addr VG_(get_EIP)( ThreadState *tst );
/*====================================================================*/
/*=== Error reporting ===*/
/*====================================================================*/
/* ------------------------------------------------------------------ */
/* Suppressions describe errors which we want to suppress, ie, not
show the user, usually because it is caused by a problem in a library
which we can't fix, replace or work around. Suppressions are read from
a file at startup time. This gives flexibility so that new
suppressions can be added to the file as and when needed.
*/
typedef
Int /* Do not make this unsigned! */
SuppKind;
/* The skin-relevant parts of a suppression are:
kind: what kind of suppression; must be in the range (0..)
string: use is optional. NULL by default.
extra: use is optional. NULL by default. void* so it's extensible.
*/
typedef
struct _Supp
Supp;
/* Useful in SK_(error_matches_suppression)() */
SuppKind VG_(get_supp_kind) ( Supp* su );
Char* VG_(get_supp_string) ( Supp* su );
void* VG_(get_supp_extra) ( Supp* su );
/* Must be used in VG_(recognised_suppression)() */
void VG_(set_supp_kind) ( Supp* su, SuppKind suppkind );
/* May be used in VG_(read_extra_suppression_info)() */
void VG_(set_supp_string) ( Supp* su, Char* string );
void VG_(set_supp_extra) ( Supp* su, void* extra );
/* ------------------------------------------------------------------ */
/* Error records contain enough info to generate an error report. The idea
is that (typically) the same few points in the program generate thousands
of errors, and we don't want to spew out a fresh error message for each
one. Instead, we use these structures to common up duplicates.
*/
typedef
Int /* Do not make this unsigned! */
ErrorKind;
/* The skin-relevant parts of an Error are:
kind: what kind of error; must be in the range (0..)
addr: use is optional. 0 by default.
string: use is optional. NULL by default.
extra: use is optional. NULL by default. void* so it's extensible.
*/
typedef
struct _Error
Error;
/* Useful in SK_(error_matches_suppression)(), SK_(pp_SkinError)(), etc */
ExeContext* VG_(get_error_where) ( Error* err );
SuppKind VG_(get_error_kind) ( Error* err );
Addr VG_(get_error_address) ( Error* err );
Char* VG_(get_error_string) ( Error* err );
void* VG_(get_error_extra) ( Error* err );
/* Call this when an error occurs. It will be recorded if it hasn't been
seen before. If it has, the existing error record will have its count
incremented.
If the error occurs in generated code, 'tst' should be NULL. If the
error occurs in non-generated code, 'tst' should be non-NULL. The
`extra' field can be stack-allocated; it will be copied (using
SKN_(dup_extra_and_update)()) if needed. But it won't be copied
if it's NULL.
If no 'a', 's' or 'extra' of interest needs to be recorded, just use
NULL for them.
*/
extern void VG_(maybe_record_error) ( ThreadState* tst, ErrorKind ekind,
Addr a, Char* s, void* extra );
/* Gets a non-blank, non-comment line of at most nBuf chars from fd.
Skips leading spaces on the line. Returns True if EOF was hit instead.
Useful for reading in extra skin-specific suppression lines.
*/
extern Bool VG_(get_line) ( Int fd, Char* buf, Int nBuf );
/*====================================================================*/
/*=== Obtaining debug information ===*/
/*====================================================================*/
/* Get the file/function/line number of the instruction at address
'a'. For these four, if debug info for the address is found, it
copies the info into the buffer/UInt and returns True. If not, it
returns False and nothing is copied. VG_(get_fnname) always
demangles C++ function names. VG_(get_fnname_w_offset) is the
same, except it appends "+N" to symbol names to indicate offsets.
*/
extern Bool VG_(get_filename) ( Addr a, Char* filename, Int n_filename );
extern Bool VG_(get_fnname) ( Addr a, Char* fnname, Int n_fnname );
extern Bool VG_(get_linenum) ( Addr a, UInt* linenum );
extern Bool VG_(get_fnname_w_offset)
( Addr a, Char* fnname, Int n_fnname );
/* This one is more efficient if getting both filename and line number,
because the two lookups are done together. */
extern Bool VG_(get_filename_linenum)
( Addr a, Char* filename, Int n_filename,
UInt* linenum );
/* Succeeds only if we find from debug info that 'a' is the address of the
first instruction in a function -- as opposed to VG_(get_fnname) which
succeeds if we find from debug info that 'a' is the address of any
instruction in a function. Use this to instrument the start of
a particular function. Nb: if an executable/shared object is stripped
of its symbols, this function will not be able to recognise function
entry points within it. */
extern Bool VG_(get_fnname_if_entry) ( Addr a, Char* filename, Int n_filename );
/* Succeeds if the address is within a shared object or the main executable.
It doesn't matter if debug info is present or not. */
extern Bool VG_(get_objname) ( Addr a, Char* objname, Int n_objname );
/* A way to get information about what segments are mapped */
typedef struct _SegInfo SegInfo;
/* Returns NULL if the SegInfo isn't found. It doesn't matter if debug info
is present or not. */
extern SegInfo* VG_(get_obj) ( Addr a );
extern const SegInfo* VG_(next_seginfo) ( const SegInfo *seg );
extern Addr VG_(seg_start) ( const SegInfo *seg );
extern UInt VG_(seg_size) ( const SegInfo *seg );
extern const UChar* VG_(seg_filename) ( const SegInfo *seg );
extern UInt VG_(seg_sym_offset)( const SegInfo *seg );
typedef
enum {
Vg_SectUnknown,
Vg_SectText,
Vg_SectData,
Vg_SectBSS,
Vg_SectGOT,
Vg_SectPLT,
}
VgSectKind;
extern VgSectKind VG_(seg_sect_kind)(Addr);
/*====================================================================*/
/*=== Shadow chunks and block-finding ===*/
/*====================================================================*/
/* The skin-relevant parts of a ShadowChunk are:
size: size of the block in bytes
addr: addr of the block
extra: anything extra kept by the skin; size is determined by
VG_(needs).sizeof_shadow_chunk
*/
typedef
struct _ShadowChunk
ShadowChunk;
extern UInt VG_(get_sc_size) ( ShadowChunk* sc );
extern Addr VG_(get_sc_data) ( ShadowChunk* sc );
/* Gets the ith word of the `extra' field. */
extern UInt VG_(get_sc_extra) ( ShadowChunk* sc, UInt i );
/* Sets the ith word of the `extra' field to `word'. */
extern void VG_(set_sc_extra) ( ShadowChunk* sc, UInt i, UInt word );
/* These two should only be used if the `alternative_free' need is set, once
we reach the point where the block would have been free'd. */
extern ShadowChunk* VG_(get_sc_next) ( ShadowChunk* sc );
extern void VG_(set_sc_next) ( ShadowChunk* sc, ShadowChunk* next );
/* Use this to free blocks if VG_(needs).alternative_free == True.
It frees the ShadowChunk and the malloc'd block it points to. */
extern void VG_(free_ShadowChunk) ( ShadowChunk* sc );
/* Makes an array of pointers to all the shadow chunks of malloc'd blocks */
extern ShadowChunk** VG_(get_malloc_shadows) ( /*OUT*/ UInt* n_shadows );
/* Determines if address 'a' is within the bounds of the block at start.
Allows a little 'slop' round the edges. */
extern Bool VG_(addr_is_in_block) ( Addr a, Addr start, UInt size );
/* Searches through currently malloc'd blocks until a matching one is found.
Returns NULL if none match. Extra arguments can be implicitly passed to
p using nested functions; see memcheck/mc_errcontext.c for an example. */
extern ShadowChunk* VG_(any_matching_mallocd_ShadowChunks)
( Bool (*p) ( ShadowChunk* ));
/* Searches through all thread's stacks to see if any match. Returns
* VG_INVALID_THREADID if none match. */
extern ThreadId VG_(any_matching_thread_stack)
( Bool (*p) ( Addr stack_min, Addr stack_max ));
/* Do memory leak detection. */
extern void VG_(generic_detect_memory_leaks) (
Bool is_valid_64k_chunk ( UInt ),
Bool is_valid_address ( Addr ),
ExeContext* get_where ( ShadowChunk* ),
VgRes leak_resolution,
Bool show_reachable,
UInt /*CoreErrorKind*/ leakSupp
);
/*====================================================================*/
/*=== Skin-specific stuff ===*/
/*====================================================================*/
/* ------------------------------------------------------------------ */
/* Details */
/* Default value for avg_translations_sizeB (in bytes), indicating typical
code expansion of about 6:1. */
#define VG_DEFAULT_TRANS_SIZEB 100
/* Information used in the startup message. `name' also determines the
string used for identifying suppressions in a suppression file as
belonging to this skin. `version' can be NULL, in which case (not
surprisingly) no version info is printed; this mechanism is designed for
skins distributed with Valgrind that share a version number with
Valgrind. Other skins not distributed as part of Valgrind should
probably have their own version number. */
extern void VG_(details_name) ( Char* name );
extern void VG_(details_version) ( Char* version );
extern void VG_(details_description) ( Char* description );
extern void VG_(details_copyright_author) ( Char* copyright_author );
/* Average size of a translation, in bytes, so that the translation
storage machinery can allocate memory appropriately. Not critical,
setting is optional. */
extern void VG_(details_avg_translation_sizeB) ( UInt size );
/* String printed if an `sk_assert' assertion fails or VG_(skin_panic)
is called. Should probably be an email address. */
extern void VG_(details_bug_reports_to) ( Char* bug_reports_to );
/* ------------------------------------------------------------------ */
/* Needs */
/* Booleans that decide core behaviour, but don't require extra
operations to be defined if `True' */
/* Should __libc_freeres() be run? Bugs in it can crash the skin. */
extern void VG_(needs_libc_freeres) ( void );
/* Want to have errors detected by Valgrind's core reported? Includes:
- pthread API errors (many; eg. unlocking a non-locked mutex)
- silly arguments to malloc() et al (eg. negative size)
- invalid file descriptors to blocking syscalls read() and write()
- bad signal numbers passed to sigaction()
- attempt to install signal handler for SIGKILL or SIGSTOP */
extern void VG_(needs_core_errors) ( void );
/* Booleans that indicate extra operations are defined; if these are True,
the corresponding template functions (given below) must be defined. A
lot like being a member of a type class. */
/* Want to report errors from skin? This implies use of suppressions, too. */
extern void VG_(needs_skin_errors) ( void );
/* Is information kept about specific individual basic blocks? (Eg. for
cachegrind there are cost-centres for every instruction, stored at a
basic block level.) If so, it sometimes has to be discarded, because
.so mmap/munmap-ping or self-modifying code (informed by the
DISCARD_TRANSLATIONS user request) can cause one instruction address
to be used for more than one instruction in one program run... */
extern void VG_(needs_basic_block_discards) ( void );
/* Skin maintains information about each register? */
extern void VG_(needs_shadow_regs) ( void );
/* Skin defines its own command line options? */
extern void VG_(needs_command_line_options) ( void );
/* Skin defines its own client requests? */
extern void VG_(needs_client_requests) ( void );
/* Skin defines its own UInstrs? */
extern void VG_(needs_extended_UCode) ( void );
/* Skin does stuff before and/or after system calls? */
extern void VG_(needs_syscall_wrapper) ( void );
/* Size, in words, of extra info about malloc'd blocks recorded by
skin. Be careful to get this right or you'll get seg faults! */
extern void VG_(needs_sizeof_shadow_block) ( Int size );
/* Skin does free()s itself? Useful if a skin needs to keep track of
blocks in some way after they're free'd.
WARNING: don't forget to call VG_(free_ShadowChunk)() for each block
eventually! */
extern void VG_(needs_alternative_free) ( void );
/* Are skin-state sanity checks performed? */
extern void VG_(needs_sanity_checks) ( void );
/* Do we need to see data symbols? */
extern void VG_(needs_data_syms) ( void );
/* ------------------------------------------------------------------ */
/* Core events to track */
/* Part of the core from which this call was made. Useful for determining
what kind of error message should be emitted. */
typedef
enum { Vg_CorePThread, Vg_CoreSignal, Vg_CoreSysCall, Vg_CoreTranslate }
CorePart;
#define EV extern void
/* Events happening in core to track. To be notified, pass a callback
function to the appropriate function. To ignore an event, don't do
anything (default is for events to be ignored). */
/* Memory events */
EV VG_(track_new_mem_startup) ( void (*f)(Addr a, UInt len,
Bool rr, Bool ww, Bool xx) );
EV VG_(track_new_mem_heap) ( void (*f)(Addr a, UInt len, Bool is_inited) );
EV VG_(track_new_mem_stack) ( void (*f)(Addr a, UInt len) );
EV VG_(track_new_mem_stack_aligned) ( void (*f)(Addr a, UInt len) );
EV VG_(track_new_mem_stack_signal) ( void (*f)(Addr a, UInt len) );
EV VG_(track_new_mem_brk) ( void (*f)(Addr a, UInt len) );
EV VG_(track_new_mem_mmap) ( void (*f)(Addr a, UInt len,
Bool rr, Bool ww, Bool xx) );
EV VG_(track_copy_mem_heap) ( void (*f)(Addr from, Addr to, UInt len) );
EV VG_(track_copy_mem_remap) ( void (*f)(Addr from, Addr to, UInt len) );
EV VG_(track_change_mem_mprotect) ( void (*f)(Addr a, UInt len,
Bool rr, Bool ww, Bool xx) );
/* Used on redzones around malloc'd blocks and at end of stack */
EV VG_(track_ban_mem_heap) ( void (*f)(Addr a, UInt len) );
EV VG_(track_ban_mem_stack) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_heap) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_stack) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_stack_aligned) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_stack_signal) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_brk) ( void (*f)(Addr a, UInt len) );
EV VG_(track_die_mem_munmap) ( void (*f)(Addr a, UInt len) );
EV VG_(track_bad_free) ( void (*f)(ThreadState* tst, Addr a) );
EV VG_(track_mismatched_free) ( void (*f)(ThreadState* tst, Addr a) );
EV VG_(track_pre_mem_read) ( void (*f)(CorePart part, ThreadState* tst,
Char* s, Addr a, UInt size) );
EV VG_(track_pre_mem_read_asciiz) ( void (*f)(CorePart part, ThreadState* tst,
Char* s, Addr a) );
EV VG_(track_pre_mem_write) ( void (*f)(CorePart part, ThreadState* tst,
Char* s, Addr a, UInt size) );
/* Not implemented yet -- have to add in lots of places, which is a
pain. Won't bother unless/until there's a need. */
/* EV VG_(track_post_mem_read) ( void (*f)(ThreadState* tst, Char* s,
Addr a, UInt size) ); */
EV VG_(track_post_mem_write) ( void (*f)(Addr a, UInt size) );
/* Scheduler events (not exhaustive) */
EV VG_(track_thread_run) ( void (*f)(ThreadId tid) );
/* Thread events (not exhaustive) */
/* Called during thread create, before the new thread has run any
instructions (or touched any memory). */
EV VG_(track_post_thread_create)( void (*f)(ThreadId tid, ThreadId child) );
/* Called once the joinee thread is terminated and the joining thread is
about to resume. */
EV VG_(track_post_thread_join) ( void (*f)(ThreadId joiner, ThreadId joinee) );
/* Mutex events (not exhaustive) */
/* Called before a thread can block while waiting for a mutex (called
regardless of whether the thread will block or not). */
EV VG_(track_pre_mutex_lock) ( void (*f)(ThreadId tid,
void* /*pthread_mutex_t* */ mutex) );
/* Called once the thread actually holds the mutex (always paired with
pre_mutex_lock). */
EV VG_(track_post_mutex_lock) ( void (*f)(ThreadId tid,
void* /*pthread_mutex_t* */ mutex) );
/* Called after a thread has released a mutex (no need for a corresponding
pre_mutex_unlock, because unlocking can't block). */
EV VG_(track_post_mutex_unlock) ( void (*f)(ThreadId tid,
void* /*pthread_mutex_t* */ mutex) );
/* Signal events (not exhaustive) */
/* Called before a signal is delivered; `alt_stack' indicates if it is
delivered on an alternative stack. */
EV VG_(track_pre_deliver_signal) ( void (*f)(ThreadId tid, Int sigNum,
Bool alt_stack) );
/* Called after a signal is delivered. */
EV VG_(track_post_deliver_signal) ( void (*f)(ThreadId tid, Int sigNum ) );
/* Others... condition variables... */
/* ... */
#undef EV
/* ------------------------------------------------------------------ */
/* Template functions */
/* These are the parameterised functions in the core. The default definitions
are overridden by LD_PRELOADed skin version. At the very least, a skin
must define the fundamental template functions. Depending on what needs
are set, extra template functions will be used too. Functions are
grouped under the needs that govern their use. */
/* ------------------------------------------------------------------ */
/* Fundamental template functions */
/* Initialise skin. Must do the following:
- initialise the `details' struct, via the VG_(details_*)() functions
- register any helpers called by generated code
May do the following:
- initialise the `needs' struct to indicate certain requirements, via
the VG_(needs_*)() functions
- initialise the `track' struct to indicate core events of interest, via
the VG_(track_*)() functions
- register any skin-specific profiling events
- any other skin-specific initialisation
*/
extern void SK_(pre_clo_init) ( void );
/* Do initialisation that can only be done after command line processing. */
extern void SK_(post_clo_init)( void );
/* Instrument a basic block. Must be a true function, ie. the same input
always results in the same output, because basic blocks can be
retranslated. Unless you're doing something really strange...
'orig_addr' is the address of the first instruction in the block. */
extern UCodeBlock* SK_(instrument) ( UCodeBlock* cb, Addr orig_addr );
/* Finish up, print out any results, etc. */
extern void SK_(fini) ( void );
/* ------------------------------------------------------------------ */
/* VG_(needs).report_errors */
/* Identify if two errors are equal, or equal enough. `res' indicates how
close is "close enough". `res' should be passed on as necessary, eg. if
the Error's `extra' part contains an ExeContext, `res' should be
passed to VG_(eq_ExeContext)() if the ExeContexts are considered. Other
than that, probably don't worry about it unless you have lots of very
similar errors occurring.
*/
extern Bool SK_(eq_SkinError) ( VgRes res, Error* e1, Error* e2 );
/* Print error context. The passed function pp_ExeContext() can be (and
probably should be) used to print the location of the error. */
extern void SK_(pp_SkinError) ( Error* err, void (*pp_ExeContext)(void) );
/* Should copy the `extra' part which the core uses to override the old
version. This is necessary to move from a temporary stack copy to a
permanent heap one.
Then should fill in any details that could be postponed until after the
decision whether to ignore the error (ie. details not affecting the
result of SK_(eq_SkinError)()). This saves time when errors are ignored.
Yuk.
*/
extern void* SK_(dup_extra_and_update) ( Error* err );
/* Return value indicates recognition. If recognised, must set skind using
VG_(set_supp_kind)(). */
extern Bool SK_(recognised_suppression) ( Char* name, Supp* su );
/* Read any extra info for this suppression kind. Most likely for filling
in the `extra' and `string' parts (with VG_(set_supp_{extra,string})())
of a suppression if necessary. Should return False if a syntax error
occurred, True otherwise. */
extern Bool SK_(read_extra_suppression_info) ( Int fd, Char* buf, Int nBuf,
Supp* su );
/* This should just check the kinds match and maybe some stuff in the
`string' and `extra' field if appropriate (using VG_(get_supp_*)() to
get the relevant suppression parts). */
extern Bool SK_(error_matches_suppression)(Error* err, Supp* su);
/* ------------------------------------------------------------------ */
/* VG_(needs).basic_block_discards */
/* Should discard any information that pertains to specific basic blocks
or instructions within the address range given. */
extern void SK_(discard_basic_block_info) ( Addr a, UInt size );
/* ------------------------------------------------------------------ */
/* VG_(needs).shadow_regs */
/* Valid values for general registers and EFLAGS register, for initialising
and updating registers when written in certain places in core. */
extern void SK_(written_shadow_regs_values) ( UInt* gen_reg, UInt* eflags );
/* ------------------------------------------------------------------ */
/* VG_(needs).command_line_options */
/* Return True if option was recognised. Presumably sets some state to
record the option as well. */
extern Bool SK_(process_cmd_line_option) ( Char* argv );
/* Print out command line usage for skin options */
extern Char* SK_(usage) ( void );
/* ------------------------------------------------------------------ */
/* VG_(needs).client_requests */
extern Bool SK_(handle_client_request) ( ThreadState* tst, UInt* arg_block, UInt *ret );
/* ------------------------------------------------------------------ */
/* VG_(needs).extends_UCode */
/* Useful to use in VG_(get_Xreg_usage)() */
#define VG_UINSTR_READS_REG(ono,regs,isWrites) \
{ if (mycat(u->tag,ono) == tag) \
{ regs[n] = mycat(u->val,ono); \
isWrites[n] = False; \
n++; \
} \
}
#define VG_UINSTR_WRITES_REG(ono,regs,isWrites) \
{ if (mycat(u->tag,ono) == tag) \
{ regs[n] = mycat(u->val,ono); \
isWrites[n] = True; \
n++; \
} \
}
/* 'X' prefix indicates eXtended UCode. */
extern Int SK_(get_Xreg_usage) ( UInstr* u, Tag tag, Int* regs,
Bool* isWrites );
extern void SK_(emit_XUInstr) ( UInstr* u, RRegSet regs_live_before );
extern Bool SK_(sane_XUInstr) ( Bool beforeRA, Bool beforeLiveness,
UInstr* u );
extern Char* SK_(name_XUOpcode) ( Opcode opc );
extern void SK_(pp_XUInstr) ( UInstr* u );
/* ------------------------------------------------------------------ */
/* VG_(needs).syscall_wrapper */
/* If either of the pre_ functions malloc() something to return, the
* corresponding post_ function had better free() it!
*/
extern void* SK_( pre_syscall) ( ThreadId tid, UInt syscallno,
Bool is_blocking );
extern void SK_(post_syscall) ( ThreadId tid, UInt syscallno,
void* pre_result, Int res,
Bool is_blocking );
/* ------------------------------------------------------------------ */
/* VG_(needs).sizeof_shadow_chunk (if > 0) */
/* Must fill in the `extra' part, using VG_(set_sc_extra)(). */
extern void SK_(complete_shadow_chunk) ( ShadowChunk* sc, ThreadState* tst );
/* ------------------------------------------------------------------ */
/* VG_(needs).alternative_free */
/* If this need is set, when a dynamic block would normally be free'd, this
is called instead. The block is contained inside the ShadowChunk; use
the VG_(get_sc_*)() functions to access it. */
extern void SK_(alt_free) ( ShadowChunk* sc, ThreadState* tst );
/* ---------------------------------------------------------------------
VG_(needs).sanity_checks */
/* Can be useful for ensuring a skin's correctness. SK_(cheap_sanity_check)
is called very frequently; SK_(expensive_sanity_check) is called less
frequently and can be more involved. */
extern Bool SK_(cheap_sanity_check) ( void );
extern Bool SK_(expensive_sanity_check) ( void );
#endif /* NDEF __VG_SKIN_H */
/*--------------------------------------------------------------------*/
/*--- end vg_skin.h ---*/
/*--------------------------------------------------------------------*/
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