adb.1

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 1 代码 · 共 880 行 · 第 1/2 页

.br
	=	local or global absolute symbol
.RE
.TP
.BR p 4
Print the addressed value in symbolic form using
the same rules for symbol lookup as
.BR a 0.
.br
.tr ''
.ns
.TP
.BR t 0
When preceded by an integer tabs to the next appropriate tab stop.
For example,
.B 8t 
moves to the next 8-space tab stop.
.br
.ns
.TP
.BR r 0
Print a space.
.br
.ns
.TP
.BR n 0
Print a new line.
.br
.ns
.tr '"
.TP
.BR '...' 0
Print the enclosed string.
.br
.tr ''
.br
.ns
.TP
.B ^
.I Dot
is decremented by the current increment.  Nothing is printed.
.br
.ns
.TP
+
.I Dot
is incremented by 1.  Nothing is printed.
.br
.ns
.TP
\-
.I Dot
is decremented by 1.  Nothing is printed.
.TP
newline
Repeat the previous command with a
.I count
of 1.
.TP
.RB [ ?/ ] l "\fI value mask\fR"
Words starting at
.I  dot
are masked with
.I mask
and compared with
.I value
until a match is found.
If
.B L
is used then the match is for 4 bytes at a time instead of 2.
If no match is found then
.I dot
is unchanged; otherwise
.I dot
is set to the matched location.
If
.I mask
is omitted then \-1 is used.
.TP
.RB [ ?/ ] w "\fI value ...\fR"
Write the 2-byte
.I value
into the addressed location.  If the command is
.BR W ,
write 4 bytes.
Odd addresses are not allowed when writing to the subprocess address space.
.TP
[\fB?/\fR]\fBm\fI b1 e1 f1\fR[\fB?/\fR]
.br
New values for
.RI ( b1,\ e1,\ f1 )
are recorded.  If less than three expressions are given then
the remaining map parameters are left unchanged.
If the `?' or `/' is followed by `\*(ST' then
the second segment (\fIb2\fR\|,\|\fIe2\fR\|,\|\fIf2\fR)
of the mapping is changed.
If the list is terminated by `?' or `/' then the file (\fIobjfil\fR or
.I corfil
respectively) is used for subsequent requests.
So that, for example, `/m?' will cause `/' to refer to
.IR objfil .
.TP
.BI \*(GT name
.I Dot
is assigned to the variable or register named.
.TP
.B !
A shell (/bin/sh) is called to read the rest of the line following `!'.
.TP
.RI $ modifier
Miscellaneous commands.  The following
.I modifiers 
are available:
.RS 12
.TP 5
.BI < f
Read commands from the file
.IR f .
If this command is executed in a file, further commands
in the file are not seen.
If
.I f
is omitted, the current input stream is terminated.  If a
.I count
is given, and is zero, the command will be ignored.
The value of the count will be placed in variable
.I 9
before the first command in
.I f
is executed.
.TP 5
.BI << f
Similar to
.B <
except it can be used in a file of commands without
causing the file to be closed.  Variable
.I 9
is saved during the execution of this command, and restored when it completes.
There is a (small) finite limit to the number of
.B <<
files that can be open at once.
.TP 5
.BI > f
Append output to the file
.IR f ,
which is created if it does not exist.  If
.I f
is omitted, output is returned to the terminal.
.TP 5
.B ?
Print process id, the signal which caused stoppage or termination,
as well as registers such as
.I $r. 
This is the default if
\fImodifier\fR is omitted.
.TP 5
.B r
Print the general registers and the instruction addressed by
.BR pc .
.I Dot
is set to pc.
.TP 5
.B b
Print all breakpoints and their associated counts and commands.
.TP 5
.B c
C stack backtrace.  If
.I address
is given then it is taken as the address of the current frame 
instead of the contents of the frame\-pointer register.  If
.B C 
is used then the names and (32 bit) values of all automatic
and static variables are printed for each active function. (broken
on the VAX).  If
.I count
is given then only the first
.I count
frames are printed.
.TP 5
.B d
Set the default radix to
.I address
and report the new value.  Note that
.I address
is interpreted in the (old) current radix.
Thus \*(lq10$d\*(rq never changes the default radix.
To make decimal the default radix, use \*(lq0t10$d\*(rq.
.TP 5
.B e
The names and values of external variables are printed.
.TP 5
.B w
Set the page width for output to
.I address
(default 80).
.TP 5
.B s
Set the limit for symbol matches to
.I address
(default 255).
.TP 5
.B o
All integers input are regarded as octal.
.TP 5
.B q
Exit from
.PN adb .
.TP 5
.B v
Print all non zero variables in octal.
.TP 5
.B m
Print the address map.
.TP 5
.B p
.RI ( "Kernel debugging" )
Change the current kernel memory mapping to map the designated 
.B "user structure"
to the address given by the symbol
.I "_u."
The
.I address
argument is the address of the user's user page table entries. 
.TP 5
.B x
.RI ( "Kernel debugging" )
The
.I address 
argument is the CPU number.
Change the current kernel 
memory mapping to that of the specified CPU. If no address is 
provided, the status of each of the CPUs in the system is displayed.
This option is ONLY valid with the 
.B \-k
option.
.RE
.TP
.BI : modifier
Manage a subprocess.  The following modifiers are available:
.RS 12
.TP 5 
.BI b c
Set breakpoint at
.IR address .
The breakpoint is executed
.IR count \-1
times before causing a stop.
Each time the breakpoint is encountered the command
.I c
is executed.  If this command is omitted or sets
.I dot
to zero then the breakpoint causes a stop.
.TP 5
.B d
Delete breakpoint at
.IR address .
.TP 5
.B r
Run
.I objfil
as a subprocess.  If
.I address
is given explicitly then the program is entered at this point; otherwise
the program is entered at its standard entry point.
.I count
specifies how many breakpoints are to be ignored before stopping.
Arguments to the subprocess may be supplied on the same line as the command.
An argument starting with < or > causes the standard
input or output to be established for the command.
.TP 5
.BI c s
The subprocess is continued with signal
.I s,
see
.MS sigvec 2 .
If
.I address
is given then the subprocess is continued at this address.
If no signal is specified then the signal
that caused the subprocess to stop is sent.
Breakpoint skipping is the same as for
.BR r .
.TP 5
.BI s s
As for
.B c 
except that the subprocess is single stepped
.I count
times.  If there is no current subprocess then
.I objfil
is run as a subprocess as for
.BR r .
In this case no signal can be sent; the remainder of the line
is treated as arguments to the subprocess.
.TP 5
.B k
The current subprocess, if any, is terminated.
.RE
.NXR "adb debugger" "command list"
.SH Variables
.NXR "adb debugger" "variables"
The
.PN adb
command provides a number of variables.
Named variables are set initially by
.PN adb
but are not used subsequently.
The following numbered variables are reserved for communication:
.TP
0
The last value printed.
.br
.ns
.TP
1
The last offset part of an instruction source.
.br
.ns
.TP
2
The previous value of variable 1.
.br
.ns
.TP
9
The count on the last
.PN $<
or
.PN $<<
command.
.PP
On entry the following are set from the system header in the
.IR corfil .
If
.I corfil
does not appear to be a
.B core 
file then these values are set from
.IR objfil .
.TP
b
The base address of the data segment.
.br
.ns
.TP
d
The data segment size.
.br
.ns
.TP
e
The entry point.
.br
.ns
.TP
m
The `magic' number (0407, 0410 or 0413).
.br
.ns
.TP
s
The stack segment size.
.br
.ns
.TP
t
The text segment size.
.SH Addresses
.NXR "adb debugger" "addresses"
The address in a file associated with
a written address is determined by a mapping associated with that file.
Each mapping is represented by two triples
.RI ( "b1, e1, f1" )
and
.RI ( "b2, e2, f2" )
and the
.I file address
corresponding to a written
.I address
is calculated as follows:
.PP
.if t .ti 1.5i
.if n .ti 8
.IR b1 \*(LE address < e1
\*(IM
.IR "file address" = address + f1\-b1,
otherwise,
.PP
.if t .ti 1.5i
.if n .ti 8
.IR b2 \*(LE address < e2
\*(IM
.IR "file address" = address + f2\-b2,
.PP
otherwise, the requested
.I address
is not legal.  In some cases (for example, for programs with separated I and D
space) the two segments for a file may overlap.  If a
.B ? 
or
.B / 
is followed by an
.B \*(ST 
then only the second triple is used.
.PP
The initial setting of both mappings is suitable for normal
.B a.out 
and
.B core 
files.  If either file is not of the kind expected then, for that file,
.I b1
is set to 0,
.I e1
is set to the maximum file size and
.I f1
is set to 0.  This way the whole
file can be examined with no address translation.
.PP
.SH Restrictions
.NXR "adb debugger" "restricted"
Because no shell is invoked to interpret the arguments of the
.PN :r
command, the customary wildcard and variable expansions cannot occur.
.SH Diagnostics
.NXR "adb debugger" "diagnostics"
When there is no command or format given to
.PN adb ,
the string `adb' appears.  
.PN adb
displays comments about inaccessible files, syntax errors,
abnormal termination of commands, etc.
Exit status is 0, unless last command failed or returned nonzero status.
.SH Files
.PN a.out
.br
.PN core
.SH See Also
cc(1), dbx(1), ptrace(2), a.out(5), core(5)
.NXR "adb debugger"