AT&T UNIX™PC Unix System V Users Manual - tenox

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SDB ( 1) SDB ( 1)
file may overlap.
The initial setting of both mappings is suitable for normal a..out
and core files. If either file is not of the kind expected, then for
that file, bl is set to 0, el is set to the maximum file size, and /1
is set to 0; in this way the whole file can be examined with no
address translation.
In order for sdb to be used on large files all appropriate values are
kept as signed 32-bit integers.
Commands.
The commands for examining data in the program are:
t Print a stack trace of the terminated or halted program.
T Print the top line of the stack trace.
variable / elm
Print the value of variable according to length l and format
m. A numeric count c indicates that a region of memory,
beginning at the address implied by variable, is to be
displayed. The length specifiers are:
b one byte
h two bytes (half word)
l four bytes (long word)
Legal values for m are:
c character
d decimal
u decimal, unsigned
o octal
x hexadecimal
r 32-bit single precision floating point
g 64-bit double precision floating point
s Assume variable is a string pointer and
print characters starting at the address
pointed to by the variable.
a. Print characters starting at the variable's
address. This format may not be used with
register variables.
p pointer to procedure
disassemble machine language instruction
with addresses printed symbolically.
I disassemble machine language instruction
with addresses just printed numerically.
The length specifiers are only effective with the formats[ c,
d, u, o and x. Any of the specifiers c, l, and m may be
omitted. If all are omitted, sdb chooses a length and a format
suitable for the variable's type as declared in the program.
If m is specified, then this format is used for displaying
the variable. A length specifier determines the output
length of the value to be displayed, sometimes resulting in
truncation. A count specifier c tells sdb to display that many
units of memory, beginning at the address of variable. The
number of bytes in one such unit of memory is determined
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