Regenerate.

(Logical change 1.62)
This commit is contained in:
mostang.com!davidm 2003-03-13 02:15:01 +00:00
parent dc0fc3b55c
commit 9787d3879d
5 changed files with 662 additions and 14 deletions

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.TH "LIBUNWIND" "3" "07 March 2003" "Programming Library " "Programming Library "
.TH "LIBUNWIND" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME
.PP
@ -84,7 +84,7 @@ unw_set_caching_policy(unw_addr_space_t,
unw_caching_policy_t);
.br
.PP
const char *unw_regname(int);
const char *unw_regname(unw_regnum_t);
.br
int
unw_get_proc_info(unw_cursor_t *,

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.TH "UNW\\_CREATE\\_ADDR\\_SPACE" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME
.PP
unw_create_addr_space \-\- create address space for remote unwinding
.PP
.SH SYNOPSIS
.PP
#include <libunwind.h>
.br
.PP
int
unw_create_addr_space(unw_accessors_t *ap,
int
byteorder);
.br
.PP
.SH DESCRIPTION
.PP
The unw_create_addr_space()
routine creates a new unwind
address\-space and initializes it based on the call\-back routines
passed via the ap
pointer and the specified byteorder\&.
The call\-back routines are described in detail below. The
byteorder
can be set to 0 to request the default byte\-order of
the unwind target. To request a particular byte\-order,
byteorder
can be set to any constant defined by
<endian.h>\&.
In particular, __LITTLE_ENDIAN
would
request little\-endian byte\-order and __BIG_ENDIAN
would
request big\-endian byte\-order. Whether or not a particular byte\-order
is supported depends on the target platform.
.PP
.SH CALL\-BACK ROUTINES
.PP
Libunwind
uses a set of call\-back routines to access the
information it needs to unwind a chain of stack\-frames. These
routines are specified via the ap
argument, which points to a
variable of type unw_accessors_t\&.
The contents of this
variable is copied into the newly\-created address space, so the
variable must remain valid only for the duration of the call to
unw_create_addr_space().
.PP
The first argument to every call\-back routine is an address\-space
identifier (as)
and the last argument is an arbitrary,
application\-specified void\-pointer (arg).
When invoking a
call\-back routine, libunwind
sets the as
argument to the
address\-space on whose behalf the invocation is made and the arg
argument to the value that was specified when
unw_init_remote(3)
was called.
.PP
The synopsis and a detailed description of every call\-back routine
follows below.
.PP
.SS CALL\-BACK ROUTINE SYNOPSIS
.PP
int
find_proc_info(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_word_t
ip,
unw_proc_info_t *pip,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPint
need_unwind_info,
void *arg);
.br
void
put_unwind_info(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_proc_info_t *pip,
void *arg);
.br
int
get_dyn_info_list_addr(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_word_t *dilap,
void *arg);
.br
int
access_mem(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_word_t
addr,
unw_word_t *valp,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPint
write,
void *arg);
.br
int
access_reg(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_regnum_t
regnum,
unw_word_t *valp,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPint
write,
void *arg);
.br
int
access_fpreg(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_regnum_t
regnum,
unw_fpreg_t *fpvalp,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPint
write,
void *arg);
.br
int
resume(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_cursor_t *cp,
void *arg);
.br
int
get_proc_name(unw_addr_space_t
as,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPunw_word_t
addr,
char *bufp,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPsize_t
buf_len,
unw_word_t *offp,
.br
\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fP\fB \fPvoid *arg);
.br
.PP
.SS FIND_PROC_INFO
.PP
Libunwind
invokes the find_proc_info()
call\-back to
locate the information need to unwind a particular procedure. The
ip
argument is an instruction\-address inside the procedure whose
information is needed. The pip
argument is a pointer to the
variable used to return the desired information. The type of this
variable is unw_proc_info_t\&.
See
unw_get_proc_info(3)
for details. Argument
need_unwind_info
is zero if the call\-back does not need to
provide values for the following members in the
unw_proc_info_t
structure: format,
unwind_info_size,
and unwind_info\&.
If
need_unwind_info
is non\-zero, valid values need to be returned
in these members. Furthermore, the contents of the memory addressed
by the unwind_info
member must remain valid until the info is
released via the put_unwind_info
call\-back (see below).
.PP
On successful completion, the find_proc_info()
call\-back must
return zero. Otherwise, the negative value of one of the
unw_error_t
error\-codes may be returned.
.PP
.SS PUT_UNWIND_INFO
.PP
Libunwind
invokes the put_unwind_info()
call\-back to
release the resources (such as memory) allocated by a previous call to
find_proc_info()
with the need_unwind_info
argument
set to a non\-zero value. The pip
argument has the same value as
the argument of the same name in the previous matching call to
find_proc_info().
Note that libunwind
does \fInot\fP
invoke put_unwind_info
for calls to find_proc_info()
with a zero need_unwind_info
argument.
.PP
.SS GET_DYN_INFO_LIST_ADDR
.PP
Libunwind
invokes the get_dyn_info_list_addr()
call\-back to obtain the address of the head of the dynamic unwind\-info
registration list. The variable stored at the returned address must
have a type of unw_dyn_info_list_t
(see
_U_dyn_register(3)).
The dliap
argument is a pointer
to a variable of type unw_word_t
which is used to return the
address of the dynamic unwind\-info registration list. If no dynamic
unwind\-info registration list exist, the value pointed to by
dliap
must be cleared to zero. Libunwind
will cache the
value returned by get_dyn_info_list_addr()
if caching is
enabled for the given address\-space. The cache can be cleared with a
call to unw_flush_cache().
.PP
On successful completion, the get_dyn_info_list_addr()
call\-back must return zero. Otherwise, the negative value of one of
the unw_error_t
error\-codes may be returned.
.PP
.SS ACCESS_MEM
.PP
Libunwind
invokes the access_mem()
call\-back to read
from or write to a word of memory in the target address\-space. The
address of the word to be accessed is passed in argument addr\&.
To read memory, libunwind
sets argument write
to zero and
valp
to point to the word that receives the read value. To
write memory, libunwind
sets argument write
to a non\-zero
value and valp
to point to the word that contains the value to
be written. The word that valp
points to is always in the
byte\-order of the host\-platform, regardless of the byte\-order of the
target. In other words, it is the responsibility of the call\-back
routine to convert between the target\&'s and the host\&'s byte\-order, if
necessary.
.PP
On successful completion, the access_mem()
call\-back must return zero. Otherwise, the negative value of one of
the unw_error_t
error\-codes may be returned.
.PP
.SS ACCESS_REG
.PP
Libunwind
invokes the access_reg()
call\-back to read
from or write to a scalar (non\-floating\-point) CPU register. The
index of the register to be accessed is passed in argument
regnum\&.
To read a register, libunwind
sets argument
write
to zero and valp
to point to the word that receives
the read value. To write a register, libunwind
sets argument
write
to a non\-zero value and valp
to point to the word
that contains the value to be written. The word that valp
points to is always in the byte\-order of the host\-platform, regardless
of the byte\-order of the target. In other words, it is the
responsibility of the call\-back routine to convert between the
target\&'s and the host\&'s byte\-order, if necessary.
.PP
On successful completion, the access_reg()
call\-back must
return zero. Otherwise, the negative value of one of the
unw_error_t
error\-codes may be returned.
.PP
.SS ACCESS_FPREG
.PP
Libunwind
invokes the access_fpreg()
call\-back to read
from or write to a floating\-point CPU register. The index of the
register to be accessed is passed in argument regnum\&.
To read a
register, libunwind
sets argument write
to zero and
fpvalp
to point to a variable of type unw_fpreg_t
that
receives the read value. To write a register, libunwind
sets
argument write
to a non\-zero value and fpvalp
to point to
the variable of type unw_fpreg_t
that contains the value to
be written. The word that fpvalp
points to is always in the
byte\-order of the host\-platform, regardless of the byte\-order of the
target. In other words, it is the responsibility of the call\-back
routine to convert between the target\&'s and the host\&'s byte\-order, if
necessary.
.PP
On successful completion, the access_fpreg()
call\-back must
return zero. Otherwise, the negative value of one of the
unw_error_t
error\-codes may be returned.
.PP
.SS RESUME
.PP
Libunwind
invokes the resume()
call\-back to resume
execution in the target address space. Argument cp
is the
unwind\-cursor that identifies the stack\-frame in which execution
should resume. By the time libunwind
invokes the resume
call\-back, it has already established the desired machine\- and
memory\-state via calls to the access_reg(),
access_fpreg,
and access_mem()
call\-backs. Thus, all
the call\-back needs to do is perform whatever action is needed to
actually resume execution.
.PP
The resume
call\-back is invoked only in response to a call to
unw_resume(3),
so applications which never invoke
unw_resume(3)
need not define the resume
callback.
.PP
On successful completion, the resume()
call\-back must return
zero. Otherwise, the negative value of one of the
unw_error_t
error\-codes may be returned. As a special case,
when resuming execution in the local address space, the call\-back will
not return on success.
.PP
.SS GET_PROC_NAME
.PP
Libunwind
invokes the get_proc_name()
call\-back to
obtain the procedure\-name of a static (not dynamically generated)
procedure. Argument addr
is an instruction\-address within the
procedure whose name is to be obtained. The bufp
argument is a
pointer to a character\-buffer used to return the procedure name. The
size of this buffer is specified in argument buf_len\&.
The
returned name must be terminated by a NUL character. If the
procedure\&'s name is longer than buf_len
bytes, it must be
truncated to buf_len\-1
bytes, with the last byte in the
buffer set to the NUL character and \-UNW_ENOMEM
must be
returned. Argument offp
is a pointer to a word which is used to
return the byte\-offset relative to the start of the procedure whose
name is being returned. For example, if procedure foo()
starts
at address 0x40003000, then invoking get_proc_name()
with
addr
set to 0x40003080 should return a value of 0x80 in the word
pointed to by offp
(assuming the procedure is at least 0x80
bytes long).
.PP
On successful completion, the get_proc_name()
call\-back must
return zero. Otherwise, the negative value of one of the
unw_error_t
error\-codes may be returned.
.PP
.SH RETURN VALUE
.PP
On successful completion, unw_create_addr_space()
returns a
non\-NULL
value that represents the newly created
address\-space. Otherwise, NULL
is returned.
.PP
.SH THREAD AND SIGNAL SAFETY
.PP
unw_create_addr_space()
is thread\-safe but \fInot\fP
safe to use from a signal handler.
.PP
.SH SEE ALSO
.PP
_U_dyn_register(3),
libunwind(3),
unw_destroy_addr_space(3),
unw_get_proc_info(3),
unw_init_remote(3),
unw_resume(3)
.PP
.SH AUTHOR
.PP
David Mosberger\-Tang
.br
Hewlett\-Packard Labs
.br
Palo\-Alto, CA 94304
.br
Email: \fBdavidm@hpl.hp.com\fP
.br
WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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.TH "UNW\\_DESTROY\\_ADDR\\_SPACE" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME
.PP
unw_destroy_addr_space \-\- destroy unwind address space
.PP
.SH SYNOPSIS
.PP
#include <libunwind.h>
.br
.PP
void
unw_destroy_addr_space(unw_addr_space_t
as);
.br
.PP
.SH DESCRIPTION
.PP
The unw_destroy_addr_space()
routine destroys the
address space specified by argument as
and thereby releases
all associated resources (such as memory).
.PP
Applications must not destroy the local address space
unw_local_addr_space\&.
Attempting to do so results in
undefined behavior (e.g., the application may crash).
.PP
.SH SEE ALSO
.PP
libunwind(3),
unw_create_addr_space(3)
.PP
.SH AUTHOR
.PP
David Mosberger\-Tang
.br
Hewlett\-Packard Labs
.br
Palo\-Alto, CA 94304
.br
Email: \fBdavidm@hpl.hp.com\fP
.br
WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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.TH "UNW\\_INIT\\_REMOTE" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME
.PP
unw_init_remote \-\- initialize cursor for remote unwinding
.PP
.SH SYNOPSIS
.PP
#include <libunwind.h>
.br
.PP
int
unw_init_remote(unw_cursor_t *c,
unw_addr_space_t as,
void *arg);
.br
.PP
.SH DESCRIPTION
.PP
The unw_init_remote()
routine initializes the unwind cursor
pointed to by c
for unwinding in the address space identified by
as\&.
The as
argument can either be set to
unw_local_addr_space
(local address space) or to an arbitrary
address space created with unw_create_addr_space().
.PP
The arg
void\-pointer tells the address space exactly what entity
should be unwound. For example, if unw_local_addr_space
is
passed in as,
then arg
needs to be a pointer to a context
structure containing the machine\-state of the initial stack frame.
However, other address\-spaces may instead expect a process\-id, a
thread\-id, or a pointer to an arbitrary structure which identifies the
stack\-frame chain to be unwound. In other words, the interpretation
of arg
is entirely dependent on the address\-space in use;
libunwind
never interprets the argument in any way on its own.
.PP
Note that unw_init_remote()
can be used to initiate unwinding
in \fIany\fP
process, including the local process in which the
unwinder itself is running. However, for local unwinding, it is
generally preferable to use unw_init_local()
instead, because
it is easier to use and because it may perform better.
.PP
.SH RETURN VALUE
.PP
On successful completion, unw_init_remote()
returns 0.
Otherwise the negative value of one of the error\-codes below is
returned.
.PP
.SH THREAD AND SIGNAL SAFETY
.PP
unw_init_remote()
is thread\-safe as well as safe to use from a
signal handler.
.PP
.SH ERRORS
.PP
.TP
UNW_EINVAL
unw_init_remote()
was called in a
version of libunwind
which supports local unwinding only
(this normally happens when defining UNW_LOCAL_ONLY
before
including <libunwind.h>
and then calling
unw_init_remote()).
.TP
UNW_EUNSPEC
An unspecified error occurred.
.TP
UNW_EBADREG
A register needed by unw_init_remote()
wasn\&'t accessible.
.PP
.SH SEE ALSO
.PP
libunwind(3),
unw_create_addr_space(3),
unw_init_local(3)
.PP
.SH AUTHOR
.PP
David Mosberger\-Tang
.br
Hewlett\-Packard Labs
.br
Palo\-Alto, CA 94304
.br
Email: \fBdavidm@hpl.hp.com\fP
.br
WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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.TH "UNW\\_RESUME" "3" "07 March 2003" "Programming Library " "Programming Library "
.TH "UNW\\_RESUME" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME
.PP
@ -23,7 +23,7 @@ unw_resume \-\- resume execution in a particular stack frame
.br
.PP
int
unw_resume(unw_cursor_t *cursor);
unw_resume(unw_cursor_t *cp);
.br
.PP
.SH DESCRIPTION
@ -31,7 +31,7 @@ unw_resume(unw_cursor_t *cursor);
.PP
The unw_resume()
routine resumes execution at the stack frame
identified by cursor\&.
identified by cp\&.
The behavior of this routine differs
slightly for local and remote unwinding.
.PP
@ -43,12 +43,13 @@ does not return in this case. Restoring the
machine state normally involves restoring the ``preserved\&''
(callee\-saved) registers. However, if execution in any of the stack
frames younger (more deeply nested) than the one identified by
cursor
cp
was interrupted by a signal, then unw_resume()
will restore all registers as well as the signal mask. Attempting to
call unw_resume()
on a cursor which identifies the stack frame
of another thread results in undefined behavior (e.g., the program may
will
restore all registers as well as the signal mask. Attempting to call
unw_resume()
on a cursor which identifies the stack frame of
another thread results in undefined behavior (e.g., the program may
crash).
.PP
For remote unwinding, unw_resume()
@ -118,12 +119,12 @@ accessible.
.TP
UNW_EINVALIDIP
The instruction pointer identified by
cursor
cp
is not valid.
.TP
UNW_BADFRAME
The stack frame identified by
cursor
cp
is not valid.
.PP
.SH SEE ALSO