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21.3.7 PowerPC Embedded

gdb supports using the DVC (Data Value Compare) register to implement in hardware simple hardware watchpoint conditions of the form:

     (gdb) watch ADDRESS|VARIABLE \
       if  ADDRESS|VARIABLE == CONSTANT EXPRESSION

The DVC register will be automatically used whenever gdb detects such pattern in a condition expression. This feature is available in native gdb running on a Linux kernel version 2.6.34 or newer.

gdb provides the following PowerPC-specific commands:

set powerpc soft-float
show powerpc soft-float
Force gdb to use (or not use) a software floating point calling convention. By default, gdb selects the calling convention based on the selected architecture and the provided executable file.
set powerpc vector-abi
show powerpc vector-abi
Force gdb to use the specified calling convention for vector arguments and return values. The valid options are auto; generic, to avoid vector registers even if they are present; altivec, to use AltiVec registers; and spe to use SPE registers. By default, gdb selects the calling convention based on the selected architecture and the provided executable file.


target dink32 dev
DINK32 ROM monitor.


target ppcbug dev

target ppcbug1 dev
PPCBUG ROM monitor for PowerPC.


target sds dev
SDS monitor, running on a PowerPC board (such as Motorola's ADS).

The following commands specific to the SDS protocol are supported by gdb:

set sdstimeout nsec
Set the timeout for SDS protocol reads to be nsec seconds. The default is 2 seconds.
show sdstimeout
Show the current value of the SDS timeout.
sds command
Send the specified command string to the SDS monitor.