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Fast back-trace for x86_64 for only collecting the call stack.

Browse source 
Adds new function to perform a pure stack walk without unwinding,
functionally similar to backtrace() but accelerated by an address
attribute cache the caller maintains across calls.
This commit is contained in:
Lassi Tuura 2011-03-19 10:00:48 +01:00 committed by Arun Sharma
parent 6c1a58fd06
commit 9e98f15e9a
37 changed files with 965 additions and 41 deletions
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1
include/dwarf.h
View file

@ -296,6 +296,7 @@ typedef struct dwarf_cursor
dwarf_loc_t loc[DWARF_NUM_PRESERVED_REGS];
unsigned int stash_frames :1; /* stash frames for fast lookup */
unsigned int use_prev_instr :1; /* use previous (= call) or current (= signal) instruction? */
unsigned int pi_valid :1; /* is proc_info valid? */
unsigned int pi_is_dynamic :1; /* proc_info found via dynamic proc info? */

10
include/libunwind-arm.h
View file

@ -286,11 +286,21 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef struct
{
/* no arm-specific fast trace */
}
unw_tdep_frame_t;
#include "libunwind-common.h"
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
extern int unw_tdep_is_fpreg (int);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-hppa.h
View file

@ -103,6 +103,12 @@ unw_tdep_save_loc_t;
/* On PA-RISC, we can directly use ucontext_t as the unwind context. */
typedef ucontext_t unw_tdep_context_t;
typedef struct
{
/* no hppa-specific fast trace */
}
unw_tdep_frame_t;
#define unw_tdep_is_fpreg(r) ((unsigned) ((r) - UNW_HPPA_FR) < 32)
#include "libunwind-dynamic.h"
@ -118,6 +124,10 @@ unw_tdep_proc_info_t;
#define unw_tdep_getcontext UNW_ARCH_OBJ (getcontext)
extern int unw_tdep_getcontext (unw_tdep_context_t *);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-ia64.h
View file

@ -150,6 +150,12 @@ unw_tdep_save_loc_t;
/* On IA-64, we can directly use ucontext_t as the unwind context. */
typedef ucontext_t unw_tdep_context_t;
typedef struct
{
/* no ia64-specific fast trace */
}
unw_tdep_frame_t;
#define unw_tdep_is_fpreg(r) ((unsigned) ((r) - UNW_IA64_FR) < 128)
#include "libunwind-dynamic.h"
@ -187,6 +193,10 @@ extern unw_word_t _Uia64_find_dyn_list (unw_addr_space_t, unw_dyn_info_t *,
signal-safe. */
extern int _Uia64_get_kernel_table (unw_dyn_info_t *);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-mips.h
View file

@ -137,6 +137,12 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef struct
{
/* no mips-specific fast trace */
}
unw_tdep_frame_t;
#include "libunwind-common.h"
/* There is no getcontext() on MIPS. Use a stub version which only saves GP
@ -148,6 +154,10 @@ extern int unw_tdep_getcontext (ucontext_t *uc);
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
extern int unw_tdep_is_fpreg (int);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-ppc32.h
View file

@ -195,11 +195,21 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef struct
{
/* no ppc32-specific fast trace */
}
unw_tdep_frame_t;
#include "libunwind-common.h"
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
extern int unw_tdep_is_fpreg (int);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-ppc64.h
View file

@ -252,11 +252,21 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef struct
{
/* no ppc64-specific fast trace */
}
unw_tdep_frame_t;
#include "libunwind-common.h"
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
extern int unw_tdep_is_fpreg (int);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

10
include/libunwind-x86.h
View file

@ -172,6 +172,12 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef struct
{
/* no x86-specific fast trace */
}
unw_tdep_frame_t;
#include "libunwind-common.h"
#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
@ -180,6 +186,10 @@ extern int unw_tdep_getcontext (unw_tdep_context_t *);
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
extern int unw_tdep_is_fpreg (int);
#define unw_tdep_make_frame_cache(n) (0)
#define unw_tdep_free_frame_cache(p) do {} while(0)
#define unw_tdep_trace(cur,addr,n,c) (-UNW_ENOINFO)
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

33
include/libunwind-x86_64.h
View file

@ -104,15 +104,44 @@ typedef struct
}
unw_tdep_proc_info_t;
typedef enum
{
UNW_X86_64_FRAME_STANDARD = -2, /* regular rbp, rsp +/- offset */
UNW_X86_64_FRAME_SIGRETURN = -1, /* special sigreturn frame */
UNW_X86_64_FRAME_OTHER = 0, /* not cacheable (special or unrecognised) */
UNW_X86_64_FRAME_GUESSED = 1 /* guessed it was regular, but not known */
}
unw_tdep_frame_type_t;
typedef struct
{
uint64_t virtual_address;
int64_t frame_type : 2; /* unw_tdep_frame_type_t classification */
int64_t last_frame : 1; /* non-zero if last frame in chain */
int64_t cfa_reg_rsp : 1; /* cfa dwarf base register is rsp vs. rbp */
int64_t cfa_reg_offset : 30; /* cfa is at this offset from base register value */
int64_t rbp_cfa_offset : 15; /* rbp saved at this offset from cfa (-1 = not saved) */
int64_t rsp_cfa_offset : 15; /* rsp saved at this offset from cfa (-1 = not saved) */
}
unw_tdep_frame_t;
#include "libunwind-dynamic.h"
#include "libunwind-common.h"
#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
extern int unw_tdep_getcontext (unw_tdep_context_t *);
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
#define unw_tdep_make_frame_cache UNW_OBJ(make_frame_cache)
#define unw_tdep_free_frame_cache UNW_OBJ(free_frame_cache)
#define unw_tdep_trace UNW_OBJ(trace)
extern int unw_tdep_getcontext (unw_tdep_context_t *);
extern int unw_tdep_is_fpreg (int);
extern unw_tdep_frame_t *unw_tdep_make_frame_cache (size_t n);
extern int unw_tdep_free_frame_cache (unw_tdep_frame_t *p);
extern int unw_tdep_trace (unw_cursor_t *cursor, void **addresses,
int *n, unw_tdep_frame_t *cache);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

1
include/tdep-arm/libunwind_i.h
View file

@ -221,6 +221,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#ifdef UNW_LOCAL_ONLY
# define tdep_find_proc_info(c,ip,n) \

1
include/tdep-hppa/libunwind_i.h
View file

@ -227,6 +227,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#ifdef UNW_LOCAL_ONLY
# define tdep_find_proc_info(c,ip,n) \

1
include/tdep-ia64/libunwind_i.h
View file

@ -223,6 +223,7 @@ struct ia64_global_unwind_state
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#define tdep_get_as(c) ((c)->as)
#define tdep_get_as_arg(c) ((c)->as_arg)
#define tdep_get_ip(c) ((c)->ip)

1
include/tdep-mips/libunwind_i.h
View file

@ -282,6 +282,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#ifdef UNW_LOCAL_ONLY
# define tdep_find_proc_info(c,ip,n) \

3
include/tdep-ppc32/libunwind_i.h
View file

@ -245,8 +245,6 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
1, c->as_arg);
}
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define
@ -259,6 +257,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#define tdep_get_func_addr UNW_OBJ(get_func_addr)
#ifdef UNW_LOCAL_ONLY

3
include/tdep-ppc64/libunwind_i.h
View file

@ -245,8 +245,6 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
1, c->as_arg);
}
#define tdep_needs_initialization UNW_OBJ(needs_initialization)
#define tdep_init UNW_OBJ(init)
/* Platforms that support UNW_INFO_FORMAT_TABLE need to define
@ -259,6 +257,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#define tdep_get_func_addr UNW_OBJ(get_func_addr)
#ifdef UNW_LOCAL_ONLY

1
include/tdep-x86/libunwind_i.h
View file

@ -243,6 +243,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
#define tdep_fetch_frame(c,ip,n) do {} while(0)
#define tdep_cache_frame(c,rs) do {} while(0)
#define tdep_reuse_frame(c,rs) do {} while(0)
#define tdep_stash_frame(c,rs) do {} while(0)
#ifdef UNW_LOCAL_ONLY
# define tdep_find_proc_info(c,ip,n) \

6
include/tdep-x86_64/libunwind_i.h
View file

@ -57,6 +57,8 @@ struct cursor
{
struct dwarf_cursor dwarf; /* must be first */
unw_tdep_frame_t frame_info; /* quick tracing assist info */
/* Format of sigcontext structure and address at which it is
stored: */
enum
@ -173,6 +175,7 @@ dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
# define tdep_cache_frame(c,rs) do {} while(0)
# define tdep_reuse_frame(c,rs) do {} while(0)
#endif
#define tdep_stash_frame UNW_OBJ(stash_frame)
#ifdef UNW_LOCAL_ONLY
# define tdep_find_proc_info(c,ip,n) \
@ -215,7 +218,8 @@ extern void tdep_cache_frame (struct dwarf_cursor *c,
struct dwarf_reg_state *rs);
extern void tdep_reuse_frame (struct dwarf_cursor *c,
struct dwarf_reg_state *rs);
extern void tdep_stash_frame (struct dwarf_cursor *c,
struct dwarf_reg_state *rs);
#endif
#endif /* X86_64_LIBUNWIND_I_H */

8
src/Makefile.am
View file

@ -258,8 +258,8 @@ libunwind_la_SOURCES_x86_64 = $(libunwind_la_SOURCES_x86_64_common) \
x86_64/setcontext.S \
x86_64/Lcreate_addr_space.c x86_64/Lget_save_loc.c x86_64/Lglobal.c \
x86_64/Linit.c x86_64/Linit_local.c x86_64/Linit_remote.c \
x86_64/Lget_proc_info.c x86_64/Lregs.c \
x86_64/Lresume.c x86_64/Lstep.c x86_64/getcontext.S
x86_64/Lget_proc_info.c x86_64/Lregs.c x86_64/Lresume.c \
x86_64/Lstash_frame.c x86_64/Lstep.c x86_64/Ltrace.c x86_64/getcontext.S
# The list of files that go into libunwind-x86_64:
libunwind_x86_64_la_SOURCES_x86_64 = $(libunwind_la_SOURCES_x86_64_common) \
@ -267,8 +267,8 @@ libunwind_x86_64_la_SOURCES_x86_64 = $(libunwind_la_SOURCES_x86_64_common) \
$(libunwind_la_SOURCES_generic) \
x86_64/Gcreate_addr_space.c x86_64/Gget_save_loc.c x86_64/Gglobal.c \
x86_64/Ginit.c x86_64/Ginit_local.c x86_64/Ginit_remote.c \
x86_64/Gget_proc_info.c x86_64/Gregs.c \
x86_64/Gresume.c x86_64/Gstep.c
x86_64/Gget_proc_info.c x86_64/Gregs.c x86_64/Gresume.c \
x86_64/Gstash_frame.c x86_64/Gstep.c x86_64/Gtrace.c
# The list of local files that go to Power 64 and 32:
libunwind_la_SOURCES_ppc = ppc/Lcreate_addr_space.c \

1
src/arm/init.h
View file

@ -62,6 +62,7 @@ common_init (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = 0;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

4
src/dwarf/Gparser.c
View file

@ -803,6 +803,10 @@ apply_reg_state (struct dwarf_cursor *c, struct dwarf_reg_state *rs)
__FUNCTION__, (long) c->ip);
return -UNW_EBADFRAME;
}
if (c->stash_frames)
tdep_stash_frame (c, rs);
return 0;
}

1
src/hppa/init.h
View file

@ -41,6 +41,7 @@ common_init (struct cursor *c, unsigned use_prev_instr)
if (ret < 0)
return ret;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
return 0;
}

1
src/mips/init.h
View file

@ -47,6 +47,7 @@ common_init (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = 0;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

1
src/ppc32/init.h
View file

@ -62,6 +62,7 @@ common_init_ppc32 (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = 0;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

1
src/ppc64/init.h
View file

@ -72,6 +72,7 @@ common_init_ppc64 (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = 0;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

1
src/x86/init.h
View file

@ -59,6 +59,7 @@ common_init (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = 0;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

4
src/x86_64/Ginit_local.c
View file

@ -51,11 +51,7 @@ unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
c->dwarf.as = unw_local_addr_space;
c->dwarf.as_arg = c;
c->uc = uc;
#if CONSERVATIVE_CHECKS
c->validate = 1;
#else
c->validate = 0;
#endif
return common_init (c, 1);
}

33
src/x86_64/Gos-linux.c
View file

@ -39,18 +39,12 @@ tdep_fetch_frame (struct dwarf_cursor *dw, unw_word_t ip, int need_unwind_info)
if (dw->pi_valid
&& dw->pi.unwind_info
&& ((struct dwarf_cie_info *) dw->pi.unwind_info)->signal_frame)
{
c->sigcontext_format = X86_64_SCF_LINUX_RT_SIGFRAME;
c->sigcontext_addr = dw->cfa;
}
else
{
c->sigcontext_format = X86_64_SCF_NONE;
c->sigcontext_addr = 0;
}
Debug(15, "fetch frame ip=0x%lx cfa=0x%lx format=%d addr=0x%lx\n",
dw->ip, dw->cfa, c->sigcontext_format, c->sigcontext_addr);
Debug(5, "fetch frame ip=0x%lx cfa=0x%lx format=%d\n",
dw->ip, dw->cfa, c->sigcontext_format);
}
HIDDEN void
@ -59,8 +53,8 @@ tdep_cache_frame (struct dwarf_cursor *dw, struct dwarf_reg_state *rs)
struct cursor *c = (struct cursor *) dw;
rs->signal_frame = c->sigcontext_format;
Debug(15, "cache frame ip=0x%lx cfa=0x%lx format=%d addr=0x%lx\n",
dw->ip, dw->cfa, c->sigcontext_format, c->sigcontext_addr);
Debug(5, "cache frame ip=0x%lx cfa=0x%lx format=%d\n",
dw->ip, dw->cfa, c->sigcontext_format);
}
HIDDEN void
@ -69,12 +63,20 @@ tdep_reuse_frame (struct dwarf_cursor *dw, struct dwarf_reg_state *rs)
struct cursor *c = (struct cursor *) dw;
c->sigcontext_format = rs->signal_frame;
if (c->sigcontext_format == X86_64_SCF_LINUX_RT_SIGFRAME)
{
/* Rest will be filled by tdep_stash_frame(), save what it needs. */
c->frame_info.frame_type = UNW_X86_64_FRAME_SIGRETURN;
c->frame_info.cfa_reg_offset = -1;
c->frame_info.cfa_reg_rsp = -1;
c->sigcontext_addr = dw->cfa;
}
else
c->sigcontext_addr = 0;
Debug(15, "reuse frame ip=0x%lx cfa=0x%lx format=%d addr=0x%lx\n",
dw->ip, dw->cfa, c->sigcontext_format, c->sigcontext_addr);
Debug(5, "reuse frame ip=0x%lx cfa=0x%lx format=%d addr=0x%lx offset=%+d\n",
dw->ip, dw->cfa, c->sigcontext_format, c->sigcontext_addr,
(c->sigcontext_format == X86_64_SCF_LINUX_RT_SIGFRAME
? c->frame_info.cfa_reg_offset : 0));
}
PROTECTED int
@ -90,17 +92,14 @@ unw_handle_signal_frame (unw_cursor_t *cursor)
#if UNW_DEBUG /* To silence compiler warnings */
/* Should not get here because we now use kernel-provided dwarf
information for the signal trampoline and dwarf_step() works.
Hence dwarf_step() should never call this function. Maybe
Hence unw_step() should never call this function. Maybe
restore old non-dwarf signal handling here, but then the
gating on unw_is_signal_frame() needs to be removed. */
struct cursor *c = (struct cursor *) cursor;
Debug(1, "old format signal frame? format=%d addr=0x%lx cfa=0x%lx\n",
c->sigcontext_format, c->sigcontext_addr, c->dwarf.cfa);
assert(c->sigcontext_format == X86_64_SCF_LINUX_RT_SIGFRAME);
assert(c->sigcontext_addr == c->dwarf.cfa);
assert(0);
#endif
return 1;
return -UNW_EBADFRAME;
}
#ifndef UNW_REMOTE_ONLY

95
src/x86_64/Gstash_frame.c Normal file
View file

@ -0,0 +1,95 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2010 by Lassi Tuura <lat@iki.fi>
This file is part of libunwind.
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. */
#include "unwind_i.h"
#include "ucontext_i.h"
HIDDEN void
tdep_stash_frame (struct dwarf_cursor *d, struct dwarf_reg_state *rs)
{
struct cursor *c = (struct cursor *) dwarf_to_cursor (d);
unw_tdep_frame_t *f = &c->frame_info;
Debug (4, "ip=0x%lx cfa=0x%lx type %d cfa [where=%d val=%ld] cfaoff=%ld"
" ra=0x%lx rbp [where=%d val=%ld @0x%lx] rsp [where=%d val=%ld @0x%lx]\n",
d->ip, d->cfa, f->frame_type,
rs->reg[DWARF_CFA_REG_COLUMN].where,
rs->reg[DWARF_CFA_REG_COLUMN].val,
rs->reg[DWARF_CFA_OFF_COLUMN].val,
DWARF_GET_LOC(d->loc[d->ret_addr_column]),
rs->reg[RBP].where, rs->reg[RBP].val, DWARF_GET_LOC(d->loc[RBP]),
rs->reg[RSP].where, rs->reg[RSP].val, DWARF_GET_LOC(d->loc[RSP]));
/* A standard frame is defined as:
- CFA is register-relative offset off RBP or RSP;
- Return address is saved at CFA-8;
- RBP is unsaved or saved at CFA+offset, offset != -1;
- RSP is unsaved or saved at CFA+offset, offset != -1. */
if (f->frame_type == UNW_X86_64_FRAME_OTHER
&& (rs->reg[DWARF_CFA_REG_COLUMN].where == DWARF_WHERE_REG)
&& (rs->reg[DWARF_CFA_REG_COLUMN].val == RBP
|| rs->reg[DWARF_CFA_REG_COLUMN].val == RSP)
&& labs(rs->reg[DWARF_CFA_OFF_COLUMN].val) < (1 << 29)
&& DWARF_GET_LOC(d->loc[d->ret_addr_column]) == d->cfa-8
&& (rs->reg[RBP].where == DWARF_WHERE_UNDEF
|| rs->reg[RBP].where == DWARF_WHERE_SAME
|| (rs->reg[RBP].where == DWARF_WHERE_CFAREL
&& labs(rs->reg[RBP].val) < (1 << 14)
&& rs->reg[RBP].val+1 != 0))
&& (rs->reg[RSP].where == DWARF_WHERE_UNDEF
|| rs->reg[RSP].where == DWARF_WHERE_SAME
|| (rs->reg[RSP].where == DWARF_WHERE_CFAREL
&& labs(rs->reg[RSP].val) < (1 << 14)
&& rs->reg[RSP].val+1 != 0)))
{
/* Save information for a standard frame. */
f->frame_type = UNW_X86_64_FRAME_STANDARD;
f->cfa_reg_rsp = (rs->reg[DWARF_CFA_REG_COLUMN].val == RSP);
f->cfa_reg_offset = rs->reg[DWARF_CFA_OFF_COLUMN].val;
if (rs->reg[RBP].where == DWARF_WHERE_CFAREL)
f->rbp_cfa_offset = rs->reg[RBP].val;
if (rs->reg[RSP].where == DWARF_WHERE_CFAREL)
f->rsp_cfa_offset = rs->reg[RSP].val;
Debug (4, " standard frame\n");
}
/* Signal frame was detected via augmentation in tdep_fetch_frame()
and partially filled in tdep_reuse_frame(). Now that we have
the delta between inner and outer CFAs available to use, fill in
the offsets for CFA and stored registers. We don't have space
for RIP, it's location is calculated relative to RBP location. */
else if (f->frame_type == UNW_X86_64_FRAME_SIGRETURN)
{
assert (f->cfa_reg_offset == -1);
f->cfa_reg_offset = d->cfa - c->sigcontext_addr;
f->rbp_cfa_offset = DWARF_GET_LOC(d->loc[RBP]) - d->cfa;
f->rsp_cfa_offset = DWARF_GET_LOC(d->loc[RSP]) - d->cfa;
Debug (4, " sigreturn frame rbpoff %d rspoff %d\n",
f->rbp_cfa_offset, f->rsp_cfa_offset);
}
/* PLT and guessed RBP-walked frames are handled in unw_step(). */
else
Debug (4, " unusual frame\n");
}

44
src/x86_64/Gstep.c
View file

@ -58,6 +58,11 @@ unw_step (unw_cursor_t *cursor)
struct cursor *c = (struct cursor *) cursor;
int ret, i;
#if CONSERVATIVE_CHECKS
int val = c->validate;
c->validate = 1;
#endif
Debug (1, "(cursor=%p, ip=0x%016lx, cfa=0x%016lx)\n",
c, c->dwarf.ip, c->dwarf.cfa);
@ -65,6 +70,10 @@ unw_step (unw_cursor_t *cursor)
c->sigcontext_format = X86_64_SCF_NONE;
ret = dwarf_step (&c->dwarf);
#if CONSERVATIVE_CHECKS
c->validate = val;
#endif
if (ret < 0 && ret != -UNW_ENOINFO)
{
Debug (2, "returning %d\n", ret);
@ -112,7 +121,11 @@ unw_step (unw_cursor_t *cursor)
}
else if (is_plt_entry (&c->dwarf))
{
/* Like regular frame, CFA = RSP+8, RA = [CFA-8], no regs saved. */
Debug (2, "found plt entry\n");
c->frame_info.cfa_reg_offset = 8;
c->frame_info.cfa_reg_rsp = -1;
c->frame_info.frame_type = UNW_X86_64_FRAME_STANDARD;
c->dwarf.loc[RIP] = DWARF_LOC (c->dwarf.cfa, 0);
c->dwarf.cfa += 8;
}
@ -142,19 +155,32 @@ unw_step (unw_cursor_t *cursor)
}
else
{
unw_word_t rbp1;
Debug (1, "[RBP=0x%Lx] = 0x%Lx (cfa = 0x%Lx)\n",
(unsigned long long) DWARF_GET_LOC (c->dwarf.loc[RBP]),
(unsigned long long) rbp,
(unsigned long long) c->dwarf.cfa);
unw_word_t rbp1 = 0;
rbp_loc = DWARF_LOC(rbp, 0);
rsp_loc = DWARF_NULL_LOC;
rip_loc = DWARF_LOC (rbp + 8, 0);
/* Heuristic to recognize a bogus frame pointer */
ret = dwarf_get (&c->dwarf, rbp_loc, &rbp1);
if (ret || ((rbp1 - rbp) > 0x4000))
rbp_loc = DWARF_NULL_LOC;
Debug (1, "[RBP=0x%lx] = 0x%lx (cfa = 0x%lx) -> 0x%lx\n",
(unsigned long) DWARF_GET_LOC (c->dwarf.loc[RBP]),
rbp, c->dwarf.cfa, rbp1);
/* Heuristic to determine incorrect guess. For RBP to be a
valid frame it needs to be above current CFA, but don't
let it go more than a little. Note that we can't deduce
anything about new RBP (rbp1) since it may not be a frame
pointer in the frame above. Just check we get the value. */
if (ret < 0
|| rbp <= c->dwarf.cfa
|| (rbp - c->dwarf.cfa) > 0x4000)
{
rip_loc = DWARF_NULL_LOC;
rbp_loc = DWARF_NULL_LOC;
}
c->frame_info.frame_type = UNW_X86_64_FRAME_GUESSED;
c->frame_info.cfa_reg_rsp = 0;
c->frame_info.cfa_reg_offset = 16;
c->frame_info.rbp_cfa_offset = -16;
c->dwarf.cfa += 16;
}

401
src/x86_64/Gtrace.c Normal file
View file

@ -0,0 +1,401 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2010 by Lassi Tuura <lat@iki.fi>
This file is part of libunwind.
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. */
#include "unwind_i.h"
#include "ucontext_i.h"
#include <signal.h>
/* Utility for timing in debug mode. You'll probably want to
comment out all unnecessary debugging in this file if you
use this, otherwise the timings printed will not make sense. */
#if UNW_DEBUG
#define rdtsc(v) \
do { unsigned lo, hi; \
__asm__ volatile ("rdtsc" : "=a" (lo), "=d" (hi)); \
(v) = ((unsigned long) lo) | ((unsigned long) hi << 32); \
} while (0)
#endif
/* There's not enough space to store RIP's location in a signal
frame, but we can calculate it relative to RBP's (or RSP's)
position in mcontext structure. Note we don't want to use
the UC_MCONTEXT_GREGS_* directly since we rely on DWARF info. */
#define dRIP (UC_MCONTEXT_GREGS_RIP - UC_MCONTEXT_GREGS_RBP)
/* Allocate and initialise hash table for frame cache lookups.
Client requests size N, which should be 5 to 10 more than expected
number of unique addresses to trace. Minimum size of 10000 is
forced. Returns the cache, or NULL if there was a memory
allocation problem. */
unw_tdep_frame_t *
unw_tdep_make_frame_cache (size_t n)
{
size_t i;
unw_tdep_frame_t *cache;
if (n < 10000)
n = 10000;
if (! (cache = malloc((n+1) * sizeof(unw_tdep_frame_t))))
return 0;
unw_tdep_frame_t empty = { 0, UNW_X86_64_FRAME_OTHER, -1, -1, 0, -1, -1 };
for (i = 0; i < n; ++i)
cache[i] = empty;
cache[0].virtual_address = n;
return cache+1;
}
/* Free the address cache allocated by unw_tdep_make_frame_cache().
Returns 0 on success, or -UNW_EINVAL if cache was NULL. */
int
unw_tdep_free_frame_cache (unw_tdep_frame_t *cache)
{
if (! cache)
return -UNW_EINVAL;
free(cache-1);
return 0;
}
/* Initialise frame properties for address cache slot F at address
RIP using current CFA, RBP and RSP values. Modifies CURSOR to
that location, performs one unw_step(), and fills F with what
was discovered about the location. Returns F.
FIXME: This probably should tell DWARF handling to never evaluate
or use registers other than RBP, RSP and RIP in case there is
highly unusual unwind info which uses these creatively. */
static unw_tdep_frame_t *
trace_init_addr (unw_tdep_frame_t *f,
unw_cursor_t *cursor,
unw_word_t cfa,
unw_word_t rip,
unw_word_t rbp,
unw_word_t rsp)
{
struct cursor *c = (struct cursor *) cursor;
struct dwarf_cursor *d = &c->dwarf;
int ret = -UNW_EINVAL;
/* Initialise frame properties: unknown, not last. */
f->virtual_address = rip;
f->frame_type = UNW_X86_64_FRAME_OTHER;
f->last_frame = 0;
f->cfa_reg_rsp = -1;
f->cfa_reg_offset = 0;
f->rbp_cfa_offset = -1;
f->rsp_cfa_offset = -1;
/* Reinitialise cursor to this instruction - but undo next/prev RIP
adjustment because unw_step will redo it - and force RIP, RBP
RSP into register locations (=~ ucontext we keep), then set
their desired values. Then perform the step. */
d->ip = rip + d->use_prev_instr;
d->cfa = cfa;
d->loc[UNW_X86_64_RIP] = DWARF_REG_LOC (d, UNW_X86_64_RIP);
d->loc[UNW_X86_64_RBP] = DWARF_REG_LOC (d, UNW_X86_64_RBP);
d->loc[UNW_X86_64_RSP] = DWARF_REG_LOC (d, UNW_X86_64_RSP);
c->frame_info = *f;
if (dwarf_put (d, d->loc[UNW_X86_64_RIP], rip) >= 0
&& dwarf_put (d, d->loc[UNW_X86_64_RBP], rbp) >= 0
&& dwarf_put (d, d->loc[UNW_X86_64_RSP], rsp) >= 0
&& (ret = unw_step (cursor)) >= 0)
*f = c->frame_info;
/* If unw_step() stopped voluntarily, remember that, even if it
otherwise could not determine anything useful. This avoids
failing trace if we hit frames without unwind info, which is
common for the outermost frame (CRT stuff) on many systems.
This avoids failing trace in very common circumstances; failing
to unw_step() loop wouldn't produce any better result. */
if (ret == 0)
f->last_frame = -1;
Debug (3, "frame va %lx type %d last %d cfa %s+%d rbp @ cfa%+d rsp @ cfa%+d\n",
f->virtual_address, f->frame_type, f->last_frame,
f->cfa_reg_rsp ? "rsp" : "rbp", f->cfa_reg_offset,
f->rbp_cfa_offset, f->rsp_cfa_offset);
return f;
}
/* Look up and if necessary fill in frame attributes for address RIP
in CACHE using current CFA, RBP and RSP values. Uses CURSOR to
perform any unwind steps necessary to fill the cache. Returns the
frame cache slot which describes RIP. */
static unw_tdep_frame_t *
trace_lookup (unw_cursor_t *cursor,
unw_tdep_frame_t *cache,
unw_word_t cfa,
unw_word_t rip,
unw_word_t rbp,
unw_word_t rsp)
{
/* First look up for previously cached information using cache as
linear probing hash table with probe step of 1. Majority of
lookups should be completed within few steps, but it is very
important the hash table does not fill up, or performance falls
off the cliff. */
uint64_t cache_size = cache[-1].virtual_address;
uint64_t probe_steps = (cache_size >> 5);
uint64_t slot = ((rip * 0x9e3779b97f4a7c16) >> 43) % cache_size;
uint64_t i;
for (i = 0; i < probe_steps; ++i)
{
uint64_t addr = cache[slot].virtual_address;
/* Return if we found the address. */
if (addr == rip)
{
Debug (4, "found address after %ld steps\n", i);
return &cache[slot];
}
/* If slot is empty, reuse it. */
if (! addr)
break;
/* Linear probe to next slot candidate, step = 1. */
if (++slot > cache_size)
slot -= cache_size;
}
/* Fill this slot, whether it's free or hash collision. */
Debug (4, "updating slot after %ld steps\n", i);
return trace_init_addr (&cache[slot], cursor, cfa, rip, rbp, rsp);
}
/* Fast stack backtrace for x86-64.
Intended for use when the application makes frequent queries to the
current call stack without any desire to unwind. Somewhat like the
GLIBC backtrace() function: fills BUFFER with the call tree from
CURSOR upwards, and SIZE with the number of stack levels so found.
When called, SIZE should tell the maximum number of entries that
can be stored in BUFFER. CACHE is used to accelerate the stack
queries; no other thread may use the same cache concurrently.
The caller should fall back to a unw_step() loop if this function
fails by returning -UNW_ESTOPUNWIND, meaning the routine hit a
stack frame that is too complex to be traced in the fast path.
This function is tuned for clients which only need to walk the
stack to get the call tree as fast as possible but without any
other details, for example profilers sampling the stack thousands
to millions of times per second. The routine handles the most
common x86-64 ABI stack layouts: CFA is RBP or RSP plus/minus
constant offset, return address is at CFA-8, and RBP and RSP are
either unchanged or saved on stack at constant offset from the CFA;
the signal return frame; and frames without unwind info provided
they are at the outermost (final) frame or can conservatively be
assumed to be frame-pointer based.
Any other stack layout will cause the routine to give up. There
are only a handful of relatively rarely used functions which do
not have a stack in the standard form: vfork, longjmp, setcontext
and _dl_runtime_profile on common linux systems for example.
On success BUFFER and *SIZE reflect the trace progress up to *SIZE
stack levels or the outermost frame, which ever is less. It may
stop short of outermost frame if unw_step() loop would also do so,
e.g. if there is no more unwind information; this is not reported
as an error.
The function returns a negative value for errors, -UNW_ESTOPUNWIND
if tracing stopped because of an unusual frame unwind info. The
BUFFER and *SIZE reflect tracing progress up to the error frame.
Callers of this function would normally look like this:
unw_cursor_t cur;
unw_context_t ctx, saved;
unw_tdep_frame_t *cache = ...;
void addrs[128];
int depth = 128;
int ret;
unw_getcontext(&ctx);
memcpy(&saved, &ctx, sizeof(ctx));
unw_init_local(&cur, &ctx);
if (! cache || (ret = unw_tdep_trace(&cur, addrs, &depth, cache)) < 0)
{
depth = 0;
unw_init_local(&cur, &saved);
while (depth < 128)
{
unw_word_t ip;
unw_get_reg(&cur, UNW_REG_IP, &ip);
addresses[depth++] = (void *) ip;
if ((ret = unw_step(&cur)) <= 0)
break;
}
}
*/
int
unw_tdep_trace (unw_cursor_t *cursor,
void **buffer,
int *size,
unw_tdep_frame_t *cache)
{
struct cursor *c = (struct cursor *) cursor;
struct dwarf_cursor *d = &c->dwarf;
unw_word_t rbp, rsp, rip, cfa;
int maxdepth = 0;
int depth = 0;
int ret;
#if UNW_DEBUG
unsigned long start, end;
rdtsc(start);
#endif
/* Check input parametres. */
if (! cursor || ! buffer || ! size || ! cache || (maxdepth = *size) <= 0)
return -UNW_EINVAL;
Debug (1, "begin ip 0x%lx cfa 0x%lx\n", d->ip, d->cfa);
/* Tell core dwarf routines to call back to us. */
d->stash_frames = 1;
/* Determine initial register values. */
rip = d->ip;
rsp = cfa = d->cfa;
if ((ret = dwarf_get (d, d->loc[UNW_X86_64_RBP], &rbp)) < 0)
{
*size = 0;
return ret;
}
/* Trace the stack upwards, starting from current RIP. Adjust
the RIP address for previous/next instruction as the main
unwinding logic would also do. We undo this before calling
back into unw_step(). */
while (depth < maxdepth)
{
rip -= d->use_prev_instr;
Debug (2, "depth %d cfa 0x%lx rip 0x%lx rsp 0x%lx rbp 0x%lx\n",
depth, cfa, rip, rsp, rbp);
/* See if we have this address cached. If not, evaluate enough of
the dwarf unwind information to fill the cache line data, or to
decide this frame cannot be handled in fast trace mode. We
cache negative results too to prevent unnecessary dwarf parsing
for common failures. */
unw_tdep_frame_t *f = trace_lookup (cursor, cache, cfa, rip, rbp, rsp);
/* Record this address in stack trace. */
buffer[depth++] = (void *) rip;
/* If we don't have information for this frame, give up. */
if (! f)
{
ret = -UNW_ENOINFO;
break;
}
Debug (3, "frame va %lx type %d last %d cfa %s+%d rbp @ cfa%+d rsp @ cfa%+d\n",
f->virtual_address, f->frame_type, f->last_frame,
f->cfa_reg_rsp ? "rsp" : "rbp", f->cfa_reg_offset,
f->rbp_cfa_offset, f->rsp_cfa_offset);
assert (f->virtual_address == rip);
/* Stop if this was the last frame. In particular don't evaluate
new register values as it may not be safe - we don't normally
run with full validation on, and do not want to - and there's
enough bad unwind info floating around that we need to trust
what unw_step() previously said, in potentially bogus frames. */
if (f->last_frame)
break;
/* Evaluate CFA and registers for the next frame. */
switch (f->frame_type)
{
case UNW_X86_64_FRAME_GUESSED:
/* Fall thru to standard processing after forcing validation. */
c->validate = 1;
case UNW_X86_64_FRAME_STANDARD:
/* Advance standard traceable frame. */
cfa = (f->cfa_reg_rsp ? rsp : rbp) + f->cfa_reg_offset;
ret = dwarf_get (d, DWARF_MEM_LOC (d, cfa - 8), &rip);
if (ret >= 0 && f->rbp_cfa_offset != -1)
ret = dwarf_get (d, DWARF_MEM_LOC (d, cfa + f->rbp_cfa_offset), &rbp);
/* Don't bother reading RSP from DWARF, CFA becomes new RSP. */
rsp = cfa;
/* Next frame needs to back up for unwind info lookup. */
d->use_prev_instr = 1;
break;
case UNW_X86_64_FRAME_SIGRETURN:
/* Advance standard signal frame, whose CFA points above saved
registers (ucontext) among other things. We know the info
is stored at some unknown constant offset off inner frame's
CFA. We determine the actual offset from DWARF unwind info. */
d->use_prev_instr = 0;
cfa = cfa + f->cfa_reg_offset;
ret = dwarf_get (d, DWARF_MEM_LOC (d, cfa + f->rbp_cfa_offset + dRIP), &rip);
if (ret >= 0)
ret = dwarf_get (d, DWARF_MEM_LOC (d, cfa + f->rbp_cfa_offset), &rbp);
if (ret >= 0)
ret = dwarf_get (d, DWARF_MEM_LOC (d, cfa + f->rsp_cfa_offset), &rsp);
/* Resume stack at signal restoration point. The stack is not
necessarily continuous here, especially with sigaltstack(). */
cfa = rsp;
/* Next frame should not back up. */
d->use_prev_instr = 0;
break;
default:
/* We cannot trace through this frame, give up and tell the
caller we had to stop. Data collected so far may still be
useful to the caller, so let it know how far we got. */
ret = -UNW_ESTOPUNWIND;
break;
}
Debug (4, "new cfa 0x%lx rip 0x%lx rsp 0x%lx rbp 0x%lx\n",
cfa, rip, rsp, rbp);
/* If we failed on ended up somewhere bogus, stop. */
if (ret < 0 || rip < 0x4000)
break;
}
#if UNW_DEBUG
rdtsc(end);
Debug (1, "returning %d depth %d, dt=%ld\n", ret, depth, end - start);
#endif
*size = depth;
return ret;
}

5
src/x86_64/Lstash_frame.c Normal file
View file

@ -0,0 +1,5 @@
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#if defined(UNW_LOCAL_ONLY) && !defined(UNW_REMOTE_ONLY)
#include "Gstash_frame.c"
#endif

5
src/x86_64/Ltrace.c Normal file
View file

@ -0,0 +1,5 @@
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#if defined(UNW_LOCAL_ONLY) && !defined(UNW_REMOTE_ONLY)
#include "Gtrace.c"
#endif

1
src/x86_64/init.h
View file

@ -64,6 +64,7 @@ common_init (struct cursor *c, unsigned use_prev_instr)
c->dwarf.args_size = 0;
c->dwarf.ret_addr_column = RIP;
c->dwarf.stash_frames = 0;
c->dwarf.use_prev_instr = use_prev_instr;
c->dwarf.pi_valid = 0;
c->dwarf.pi_is_dynamic = 0;

265
tests/Gtest-trace.c Normal file
View file

@ -0,0 +1,265 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2010 by Lassi Tuura <lat@iki.fi>
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. */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <errno.h>
#if HAVE_EXECINFO_H
# include <execinfo.h>
#else
extern int backtrace (void **, int);
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libunwind.h>
#define panic(args...) \
{ fprintf (stderr, args); exit (-1); }
#ifndef HAVE_SIGHANDLER_T
typedef RETSIGTYPE (*sighandler_t) (int);
#endif
int verbose;
int num_errors;
/* These variables are global because they
* cause the signal stack to overflow */
char buf[512], name[256];
void *addresses[2][128];
unw_cursor_t cursor;
ucontext_t uc;
#if UNW_TARGET_X86_64
unw_tdep_frame_t *cache;
#endif
static void
do_backtrace (void)
{
unw_word_t ip;
int ret = -UNW_ENOINFO;
int depth = 128;
int i, n;
if (verbose)
printf ("\tfast backtrace:\n");
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
panic ("unw_init_local failed!\n");
#if UNW_TARGET_X86_64
if ((ret = unw_tdep_trace (&cursor, addresses[0], &depth, cache)) < 0)
{
unw_get_reg (&cursor, UNW_REG_IP, &ip);
printf ("FAILURE: unw_tdep_trace() returned %d for ip=%lx\n", ret, (long) ip);
++num_errors;
}
#endif
if (ret < 0)
{
i = 0;
do
{
unw_get_reg (&cursor, UNW_REG_IP, &ip);
addresses[0][i] = (void *) ip;
}
while ((ret = unw_step (&cursor)) >= 0 && ++i < 128);
if (ret < 0)
{
unw_get_reg (&cursor, UNW_REG_IP, &ip);
printf ("FAILURE: unw_step() returned %d for ip=%lx\n", ret, (long) ip);
++num_errors;
}
}
if (verbose)
for (i = 0; i < depth; ++i)
printf ("\t #%-3d ip=%p\n", i, addresses[0][i]);
if (verbose)
printf ("\n\tvia backtrace():\n");
n = backtrace (addresses[1], 128);
if (verbose)
for (i = 0; i < n; ++i)
printf ("\t #%-3d ip=%p\n", i, addresses[1][i]);
if (n != depth)
{
printf ("FAILURE: unw_tdep_trace() and backtrace() depths differ: %d vs. %d\n", depth, n);
++num_errors;
}
else
for (i = 1; i < depth; ++i)
/* Allow one in difference in comparison, trace returns adjusted addresses. */
if (labs((unw_word_t) addresses[0][i] - (unw_word_t) addresses[1][i]) > 1)
{
printf ("FAILURE: unw_tdep_trace() and backtrace() addresses differ at %d: %p vs. %p\n",
i, addresses[0][n], addresses[1][n]);
++num_errors;
}
}
void
foo (long val)
{
do_backtrace ();
}
void
bar (long v)
{
extern long f (long);
int arr[v];
/* This is a vain attempt to use up lots of registers to force
the frame-chain info to be saved on the memory stack on ia64.
It happens to work with gcc v3.3.4 and gcc v3.4.1 but perhaps
not with any other compiler. */
foo (f (arr[0]) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
+ (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + f (v))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
)))))))))))))))))))))))))))))))))))))))))))))))))))))));
}
void
sighandler (int signal, void *siginfo, void *context)
{
ucontext_t *uc = context;
int sp;
if (verbose)
{
printf ("sighandler: got signal %d, sp=%p", signal, &sp);
#if UNW_TARGET_IA64
# if defined(__linux__)
printf (" @ %lx", uc->uc_mcontext.sc_ip);
# else
{
uint16_t reason;
uint64_t ip;
__uc_get_reason (uc, &reason);
__uc_get_ip (uc, &ip);
printf (" @ %lx (reason=%d)", ip, reason);
}
# endif
#elif UNW_TARGET_X86
#if defined __linux__
printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_EIP]);
#elif defined __FreeBSD__
printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_eip);
#endif
#elif UNW_TARGET_X86_64
#if defined __linux__
printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_RIP]);
#elif defined __FreeBSD__
printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_rip);
#endif
#endif
printf ("\n");
}
do_backtrace();
}
int
main (int argc, char **argv)
{
struct sigaction act;
stack_t stk;
#if UNW_TARGET_X86_64
cache = unw_tdep_make_frame_cache (0);
#endif
verbose = (argc > 1);
if (verbose)
printf ("Normal backtrace:\n");
bar (1);
memset (&act, 0, sizeof (act));
act.sa_handler = (void (*)(int)) sighandler;
act.sa_flags = SA_SIGINFO;
if (sigaction (SIGTERM, &act, NULL) < 0)
panic ("sigaction: %s\n", strerror (errno));
if (verbose)
printf ("\nBacktrace across signal handler:\n");
kill (getpid (), SIGTERM);
if (verbose)
printf ("\nBacktrace across signal handler on alternate stack:\n");
stk.ss_sp = malloc (SIGSTKSZ);
if (!stk.ss_sp)
panic ("failed to allocate SIGSTKSZ (%u) bytes\n", SIGSTKSZ);
stk.ss_size = SIGSTKSZ;
stk.ss_flags = 0;
if (sigaltstack (&stk, NULL) < 0)
panic ("sigaltstack: %s\n", strerror (errno));
memset (&act, 0, sizeof (act));
act.sa_handler = (void (*)(int)) sighandler;
act.sa_flags = SA_ONSTACK | SA_SIGINFO;
if (sigaction (SIGTERM, &act, NULL) < 0)
panic ("sigaction: %s\n", strerror (errno));
kill (getpid (), SIGTERM);
if (num_errors > 0)
{
fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
exit (-1);
}
#if UNW_TARGET_X86_64
unw_tdep_free_frame_cache (cache);
#endif
if (verbose)
printf ("SUCCESS.\n");
return 0;
}

5
tests/Ltest-trace.c Normal file
View file

@ -0,0 +1,5 @@
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#if !defined(UNW_REMOTE_ONLY)
#include "Gtest-trace.c"
#endif

3
tests/Makefile.am
View file

@ -41,6 +41,7 @@ endif #ARCH_IA64
Gtest-concurrent Ltest-concurrent \
Gtest-resume-sig Ltest-resume-sig \
Gtest-dyn1 Ltest-dyn1 \
Gtest-trace Ltest-trace \
test-async-sig test-flush-cache test-init-remote \
test-mem test-setjmp test-ptrace \
Ltest-nomalloc rs-race
@ -98,6 +99,8 @@ Gtest_bt_SOURCES = Gtest-bt.c ident.c
Ltest_bt_SOURCES = Ltest-bt.c ident.c
test_ptrace_misc_SOURCES = test-ptrace-misc.c ident.c
Ltest_nomalloc_SOURCES = Ltest-nomalloc.c
Gtest_trace_SOURCES = Gtest-trace.c ident.c
Ltest_trace_SOURCES = Ltest-trace.c ident.c
LIBUNWIND = $(top_builddir)/src/libunwind-$(arch).la $(LIBUNWIND_local)
LIBUNWIND_ptrace = $(top_builddir)/src/libunwind-ptrace.a

6
tests/check-namespace.sh.in
View file

@ -123,6 +123,9 @@ check_local_unw_abi () {
match _U${plat}_is_fpreg
match _UL${plat}_dwarf_search_unwind_table
match _U${plat}_setcontext
match _UL${plat}_free_frame_cache
match _UL${plat}_make_frame_cache
match _UL${plat}_trace
;;
*)
match _U${plat}_is_fpreg
@ -186,6 +189,9 @@ check_generic_unw_abi () {
match _U${plat}_get_elf_image
match _U${plat}_is_fpreg
match _U${plat}_dwarf_search_unwind_table
match _U${plat}_free_frame_cache
match _U${plat}_make_frame_cache
match _U${plat}_trace
;;
*)
match _U${plat}_is_fpreg