Red Hat ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE, Manual

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328 Appendix D. gdb Remote Serial Protocol
V
-- reserved
Reserved for future use.
w
-- reserved
Reserved for future use.
W
-- reserved
Reserved for future use.
x
-- reserved
Reserved for future use.
Xaddr,length:XX...
-- write mem (binary)
addr
is address,
length
is number of bytes,
XX...
is binary data. The characters
$
,
#
, and
0x7d
are escaped using
0x7d
.
Reply:
OK
for success
E
NN
for an error
y
-- reserved
Reserved for future use.
Y
reserved
Reserved for future use.
ztype,addr,length
-- remove breakpoint or watchpoint (draft)
Ztype,addr,length
-- insert breakpoint or watchpoint (draft)
Insert (
Z
) or remove (
z
) a
type
breakpoint or watchpoint starting at address
address
and
covering the next
length
bytes.
Each breakpoint and watchpoint packet
type
is documented separately.
Implementation notes: A remote target shall return an empty string for an unrecognized break-
point or watchpoint packet
type
. A remote target shall support either both or neither of a given
Ztype
. . . and
ztype
. . . packet pair. To avoid potential problems with duplicate packets, the
operations should be implemented in an idempotent way.
z0,addr,length
-- remove memory breakpoint (draft)
Z0,addr,length
-- insert memory breakpoint (draft)
Insert (
Z0
) or remove (
z0
) a memory breakpoint at address
addr
of size
length
.
A memory breakpoint is implemented by replacing the instruction at
addr
with a software break-
point or trap instruction. The
length
is used by targets that indicates the size of the breakpoint
(in bytes) that should be inserted (e.g., the arm and mips can insert either a 2 or 4 byte break-
point).