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gcc/libgo/runtime/runtime.h
Cherry Zhang fba70f605e compiler,runtime: use __builtin_dwarf_cfa for getcallersp 
Currently, the compiler lowers runtime.getcallersp to
    __builtin_frame_address(1). In the C side of the runtime,
    getcallersp is defined as __builtin_frame_address(0). They don't
    match. Further, neither of them actually returns the caller's SP.
    On AMD64, __builtin_frame_address(0) just returns the frame
    pointer. __builtin_frame_address(1) returns the memory content
    where the frame pointer points to, which is typically the
    caller's frame pointer but can also be garbage if the frame
    pointer is not enabled.
    
    This CL changes it to use __builtin_dwarf_cfa(), which returns
    the caller's SP at the call site. This matches the SP we get
    from unwinding the stack.
    
    Currently getcallersp is not used for anything real. It will be
    used for precise stack scan (a new version of CL 159098).
    
    Reviewed-on: https://go-review.googlesource.com/c/162905

	* go-gcc.cc (Gcc_backend::Gcc_backend): Define __builtin_dwarf_cfa
	instead of __builtin_frame_address.

From-SVN: r268952
2019-02-15 23:22:29 +00:00

510 lines
15 KiB
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "config.h"
#include "go-assert.h"
#include <complex.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <semaphore.h>
#include <ucontext.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#define _STRINGIFY2_(x) #x
#define _STRINGIFY_(x) _STRINGIFY2_(x)
#define GOSYM_PREFIX _STRINGIFY_(__USER_LABEL_PREFIX__)
/* This file supports C files copied from the 6g runtime library.
This is a version of the 6g runtime.h rewritten for gccgo's version
of the code. */
typedef signed int int8 __attribute__ ((mode (QI)));
typedef unsigned int uint8 __attribute__ ((mode (QI)));
typedef signed int int16 __attribute__ ((mode (HI)));
typedef unsigned int uint16 __attribute__ ((mode (HI)));
typedef signed int int32 __attribute__ ((mode (SI)));
typedef unsigned int uint32 __attribute__ ((mode (SI)));
typedef signed int int64 __attribute__ ((mode (DI)));
typedef unsigned int uint64 __attribute__ ((mode (DI)));
typedef float float32 __attribute__ ((mode (SF)));
typedef double float64 __attribute__ ((mode (DF)));
typedef signed int intptr __attribute__ ((mode (pointer)));
typedef unsigned int uintptr __attribute__ ((mode (pointer)));
typedef intptr intgo; // Go's int
typedef uintptr uintgo; // Go's uint
typedef uintptr uintreg;
/* Defined types. */
typedef _Bool bool;
typedef uint8 byte;
typedef struct g G;
typedef struct mutex Lock;
typedef struct m M;
typedef struct p P;
typedef struct note Note;
typedef struct String String;
typedef struct FuncVal FuncVal;
typedef struct SigTab SigTab;
typedef struct hchan Hchan;
typedef struct timer Timer;
typedef struct lfnode LFNode;
typedef struct cgoMal CgoMal;
typedef struct PollDesc PollDesc;
typedef struct sudog SudoG;
typedef struct schedt Sched;
typedef struct __go_open_array Slice;
typedef struct iface Iface;
typedef struct eface Eface;
typedef struct __go_type_descriptor Type;
typedef struct _defer Defer;
typedef struct _panic Panic;
typedef struct __go_ptr_type PtrType;
typedef struct __go_func_type FuncType;
typedef struct __go_interface_type InterfaceType;
typedef struct __go_map_type MapType;
typedef struct __go_channel_type ChanType;
typedef struct tracebackg Traceback;
typedef struct location Location;
struct String
{
const byte* str;
intgo len;
};
struct FuncVal
{
uintptr_t fn;
// variable-size, fn-specific data here
};
#include "array.h"
// Rename Go types generated by mkrsysinfo.sh from C types, to avoid
// the name conflict.
#define timeval go_timeval
#define timespec go_timespec
#include "runtime.inc"
#undef timeval
#undef timespec
/*
* Per-CPU declaration.
*/
extern M* runtime_m(void);
extern G* runtime_g(void)
__asm__(GOSYM_PREFIX "runtime.getg");
extern M* runtime_m0(void)
__asm__(GOSYM_PREFIX "runtime.runtime_m0");
extern G* runtime_g0(void)
__asm__(GOSYM_PREFIX "runtime.runtime_g0");
enum
{
true = 1,
false = 0,
};
enum
{
PtrSize = sizeof(void*),
};
enum
{
// Per-M stack segment cache size.
StackCacheSize = 32,
// Global <-> per-M stack segment cache transfer batch size.
StackCacheBatch = 16,
};
struct SigTab
{
int32 sig;
int32 flags;
void* fwdsig;
};
#ifdef GOOS_nacl
enum {
NaCl = 1,
};
#else
enum {
NaCl = 0,
};
#endif
#ifdef GOOS_windows
enum {
Windows = 1
};
#else
enum {
Windows = 0
};
#endif
#ifdef GOOS_solaris
enum {
Solaris = 1
};
#else
enum {
Solaris = 0
};
#endif
extern bool runtime_copystack;
/*
* defined macros
* you need super-gopher-guru privilege
* to add this list.
*/
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
#define nil ((void*)0)
#define USED(v) ((void) v)
#define ROUND(x, n) (((x)+(n)-1)&~(uintptr)((n)-1)) /* all-caps to mark as macro: it evaluates n twice */
enum {
// hashinit wants this many random bytes
HashRandomBytes = 32
};
void runtime_hashinit(void);
/*
* external data
*/
extern uintptr* runtime_getZerobase(void)
__asm__(GOSYM_PREFIX "runtime.getZerobase");
extern G* runtime_getallg(intgo)
__asm__(GOSYM_PREFIX "runtime.getallg");
extern uintptr runtime_getallglen(void)
__asm__(GOSYM_PREFIX "runtime.getallglen");
extern M* runtime_getallm(void)
__asm__(GOSYM_PREFIX "runtime.getallm");
extern Sched* runtime_sched;
extern uint32 runtime_panicking(void)
__asm__ (GOSYM_PREFIX "runtime.getPanicking");
extern bool runtime_isstarted;
extern bool runtime_isarchive;
extern void panicmem(void) __asm__ (GOSYM_PREFIX "runtime.panicmem");
/*
* common functions and data
*/
#define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
#define runtime_strncmp(s1, s2, n) __builtin_strncmp((s1), (s2), (n))
#define runtime_strstr(s1, s2) __builtin_strstr((s1), (s2))
intgo runtime_findnull(const byte*)
__asm__ (GOSYM_PREFIX "runtime.findnull");
void runtime_gogo(G*)
__asm__ (GOSYM_PREFIX "runtime.gogo");
struct __go_func_type;
void runtime_args(int32, byte**)
__asm__ (GOSYM_PREFIX "runtime.args");
void runtime_alginit(void)
__asm__ (GOSYM_PREFIX "runtime.alginit");
void runtime_goargs(void)
__asm__ (GOSYM_PREFIX "runtime.goargs");
void runtime_throw(const char*) __attribute__ ((noreturn));
void runtime_panicstring(const char*) __attribute__ ((noreturn));
bool runtime_canpanic(G*);
void runtime_printf(const char*, ...);
int32 runtime_snprintf(byte*, int32, const char*, ...);
#define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
#define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
String runtime_gostringnocopy(const byte*)
__asm__ (GOSYM_PREFIX "runtime.gostringnocopy");
void runtime_schedinit(void)
__asm__ (GOSYM_PREFIX "runtime.schedinit");
void runtime_initsig(bool)
__asm__ (GOSYM_PREFIX "runtime.initsig");
#define runtime_open(p, f, m) open((p), (f), (m))
#define runtime_read(d, v, n) read((d), (v), (n))
#define runtime_write(d, v, n) write((d), (v), (n))
#define runtime_close(d) close(d)
void runtime_ready(G*, intgo, bool)
__asm__ (GOSYM_PREFIX "runtime.ready");
String runtime_getenv(const char*);
int32 runtime_atoi(const byte*, intgo);
void* runtime_mstart(void*);
G* runtime_malg(bool, bool, byte**, uintptr*)
__asm__(GOSYM_PREFIX "runtime.malg");
void runtime_minit(void)
__asm__ (GOSYM_PREFIX "runtime.minit");
void runtime_signalstack(byte*, uintptr)
__asm__ (GOSYM_PREFIX "runtime.signalstack");
void runtime_mallocinit(void)
__asm__ (GOSYM_PREFIX "runtime.mallocinit");
void* runtime_mallocgc(uintptr, const Type*, bool)
__asm__ (GOSYM_PREFIX "runtime.mallocgc");
void* runtime_sysAlloc(uintptr, uint64*)
__asm__ (GOSYM_PREFIX "runtime.sysAlloc");
void runtime_sysFree(void*, uintptr, uint64*)
__asm__ (GOSYM_PREFIX "runtime.sysFree");
void runtime_mprofinit(void);
#define runtime_getcallersp() __builtin_dwarf_cfa()
void runtime_mcall(FuncVal*)
__asm__ (GOSYM_PREFIX "runtime.mcall");
int32 runtime_timediv(int64, int32, int32*)
__asm__ (GOSYM_PREFIX "runtime.timediv");
int32 runtime_round2(int32 x); // round x up to a power of 2.
// atomic operations
#define runtime_xadd(p, v) __atomic_add_fetch (p, v, __ATOMIC_SEQ_CST)
#define runtime_atomicload(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
void runtime_setg(G*)
__asm__ (GOSYM_PREFIX "runtime.setg");
void runtime_newextram(void)
__asm__ (GOSYM_PREFIX "runtime.newextram");
#define runtime_exit(s) exit(s)
void runtime_gosched(void)
__asm__ (GOSYM_PREFIX "runtime.Gosched");
void runtime_schedtrace(bool)
__asm__ (GOSYM_PREFIX "runtime.schedtrace");
void runtime_goparkunlock(Lock*, String, byte, intgo)
__asm__ (GOSYM_PREFIX "runtime.goparkunlock");
void runtime_tsleep(int64, const char*);
void runtime_entersyscall()
__asm__ (GOSYM_PREFIX "runtime.entersyscall");
void runtime_entersyscallblock()
__asm__ (GOSYM_PREFIX "runtime.entersyscallblock");
G* __go_go(uintptr, void*);
int32 runtime_callers(int32, Location*, int32, bool keep_callers);
int64 runtime_nanotime(void) // monotonic time
__asm__(GOSYM_PREFIX "runtime.nanotime");
void runtime_dopanic(int32) __attribute__ ((noreturn));
void runtime_startpanic(void)
__asm__ (GOSYM_PREFIX "runtime.startpanic");
void runtime_unwindstack(G*, byte*);
void runtime_usleep(uint32)
__asm__ (GOSYM_PREFIX "runtime.usleep");
int64 runtime_cputicks(void)
__asm__ (GOSYM_PREFIX "runtime.cputicks");
int64 runtime_tickspersecond(void)
__asm__ (GOSYM_PREFIX "runtime.tickspersecond");
void runtime_blockevent(int64, int32);
extern int64 runtime_blockprofilerate;
G* runtime_netpoll(bool)
__asm__ (GOSYM_PREFIX "runtime.netpoll");
void runtime_parsedebugvars(void)
__asm__(GOSYM_PREFIX "runtime.parsedebugvars");
void _rt0_go(void);
G* runtime_timejump(void);
/*
* mutual exclusion locks. in the uncontended case,
* as fast as spin locks (just a few user-level instructions),
* but on the contention path they sleep in the kernel.
* a zeroed Lock is unlocked (no need to initialize each lock).
*/
void runtime_lock(Lock*)
__asm__(GOSYM_PREFIX "runtime.lock");
void runtime_unlock(Lock*)
__asm__(GOSYM_PREFIX "runtime.unlock");
/*
* sleep and wakeup on one-time events.
* before any calls to notesleep or notewakeup,
* must call noteclear to initialize the Note.
* then, exactly one thread can call notesleep
* and exactly one thread can call notewakeup (once).
* once notewakeup has been called, the notesleep
* will return. future notesleep will return immediately.
* subsequent noteclear must be called only after
* previous notesleep has returned, e.g. it's disallowed
* to call noteclear straight after notewakeup.
*
* notetsleep is like notesleep but wakes up after
* a given number of nanoseconds even if the event
* has not yet happened. if a goroutine uses notetsleep to
* wake up early, it must wait to call noteclear until it
* can be sure that no other goroutine is calling
* notewakeup.
*
* notesleep/notetsleep are generally called on g0,
* notetsleepg is similar to notetsleep but is called on user g.
*/
void runtime_noteclear(Note*)
__asm__ (GOSYM_PREFIX "runtime.noteclear");
void runtime_notesleep(Note*)
__asm__ (GOSYM_PREFIX "runtime.notesleep");
void runtime_notewakeup(Note*)
__asm__ (GOSYM_PREFIX "runtime.notewakeup");
bool runtime_notetsleep(Note*, int64) // false - timeout
__asm__ (GOSYM_PREFIX "runtime.notetsleep");
bool runtime_notetsleepg(Note*, int64) // false - timeout
__asm__ (GOSYM_PREFIX "runtime.notetsleepg");
/*
* low level C-called
*/
#define runtime_mmap mmap
#define runtime_munmap munmap
#define runtime_madvise madvise
#define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
#define runtime_getcallerpc() __builtin_return_address(0)
#ifdef __rtems__
void __wrap_rtems_task_variable_add(void **);
#endif
/*
* runtime go-called
*/
void reflect_call(const struct __go_func_type *, FuncVal *, _Bool, _Bool,
void **, void **)
__asm__ (GOSYM_PREFIX "runtime.reflectcall");
void runtime_panic(Eface)
__asm__ (GOSYM_PREFIX "runtime.gopanic");
void runtime_panic(Eface)
__attribute__ ((noreturn));
/*
* runtime c-called (but written in Go)
*/
void runtime_newErrorCString(uintptr, Eface*)
__asm__ (GOSYM_PREFIX "runtime.NewErrorCString");
/*
* wrapped for go users
*/
void runtime_procyield(uint32)
__asm__(GOSYM_PREFIX "runtime.procyield");
void runtime_osyield(void)
__asm__(GOSYM_PREFIX "runtime.osyield");
uintptr runtime_memlimit(void);
#define ISNAN(f) __builtin_isnan(f)
enum
{
UseSpanType = 1,
};
#define runtime_setitimer setitimer
void runtime_check(void)
__asm__ (GOSYM_PREFIX "runtime.check");
// Size of stack space allocated using Go's allocator.
// This will be 0 when using split stacks, as in that case
// the stacks are allocated by the splitstack library.
extern uintptr runtime_stacks_sys;
/*
* ia64's register file is spilled to a separate stack, the register backing
* store, on window overflow, and must also be scanned. This occupies the other
* end of the normal stack allocation, growing upwards.
* We also need to ensure all register windows are flushed to the backing
* store, as unlike SPARC, __builtin_unwind_init doesn't do this on ia64.
*/
#ifdef __ia64__
# define secondary_stack_pointer() __builtin_ia64_bsp()
# define initial_secondary_stack_pointer(stack_alloc) (stack_alloc)
# define flush_registers_to_secondary_stack() __builtin_ia64_flushrs()
#else
# define secondary_stack_pointer() nil
# define initial_secondary_stack_pointer(stack_alloc) nil
# define flush_registers_to_secondary_stack()
#endif
struct backtrace_state;
extern struct backtrace_state *__go_get_backtrace_state(void);
extern void __go_syminfo_fnname_callback(void*, uintptr_t, const char*,
uintptr_t, uintptr_t);
extern void runtime_main(void*)
__asm__(GOSYM_PREFIX "runtime.main");
int32 getproccount(void);
#define PREFETCH(p) __builtin_prefetch(p)
bool runtime_gcwaiting(void);
void runtime_badsignal(int);
Defer* runtime_newdefer(void);
void runtime_freedefer(Defer*);
extern void _cgo_wait_runtime_init_done (void);
extern void _cgo_notify_runtime_init_done (void)
__asm__ (GOSYM_PREFIX "runtime._cgo_notify_runtime_init_done");
extern _Bool runtime_iscgo;
extern uintptr __go_end __attribute__ ((weak));
extern void *getitab(const struct __go_type_descriptor *,
const struct __go_type_descriptor *,
_Bool)
__asm__ (GOSYM_PREFIX "runtime.getitab");
extern void runtime_cpuinit(void);
extern void setRandomNumber(uint32)
__asm__ (GOSYM_PREFIX "runtime.setRandomNumber");
extern void setIsCgo(void)
__asm__ (GOSYM_PREFIX "runtime.setIsCgo");
extern void setSupportAES(bool)
__asm__ (GOSYM_PREFIX "runtime.setSupportAES");
extern void typedmemmove(const Type *, void *, const void *)
__asm__ (GOSYM_PREFIX "runtime.typedmemmove");
extern void setncpu(int32)
__asm__(GOSYM_PREFIX "runtime.setncpu");
extern Sched* runtime_getsched(void)
__asm__ (GOSYM_PREFIX "runtime.getsched");
extern void setpagesize(uintptr_t)
__asm__(GOSYM_PREFIX "runtime.setpagesize");
struct funcfileline_return
{
String retfn;
String retfile;
intgo retline;
};
struct funcfileline_return
runtime_funcfileline (uintptr targetpc, int32 index)
__asm__ (GOSYM_PREFIX "runtime.funcfileline");
/*
* helpers for stack scan.
*/
bool scanstackwithmap(void*)
__asm__(GOSYM_PREFIX "runtime.scanstackwithmap");
bool doscanstack(G*, void*)
__asm__("runtime.doscanstack");
bool runtime_usestackmaps;
bool probestackmaps(void)
__asm__("runtime.probestackmaps");
// This is set to non-zero when calling backtrace_full. This is used
// to avoid getting hanging on a recursive lock in dl_iterate_phdr on
// older versions of glibc when a SIGPROF signal arrives while
// collecting a backtrace.
extern uint32 __go_runtime_in_callers;
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