Red Hat ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE, Руководство пользователя

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Chapter 10. Examining Data 81
10.11. Floating point hardware
Depending on the configuration, gdb may be able to give you more information about the status of the
floating point hardware.
info float
Display hardware-dependent information about the floating point unit. The exact contents and
layout vary depending on the floating point chip. Currently,
info float
is supported on the
ARM and x86 machines.
10.12. Vector Unit
Depending on the configuration, gdb may be able to give you more information about the status of the
vector unit.
info vector
Display information about the vector unit. The exact contents and layout vary depending on the
hardware.
10.13. Memory region attributes
Memory region attributes allow you to describe special handling required by regions of your target’s
memory. gdb uses attributes to determine whether to allow certain types of memory accesses; whether
to use specific width accesses; and whether to cache target memory.
Defined memory regions can be individually enabled and disabled. When a memory region is disabled,
gdb uses the default attributes when accessing memory in that region. Similarly, if no memory regions
have been defined, gdb uses the default attributes when accessing all memory.
When a memory region is defined, it is given a number to identify it; to enable, disable, or remove a
memory region, you specify that number.
mem
lower upper attributes
...
Define memory region bounded by
lower
and
upper
with attributes
attributes
. . . . Note that
upper
== 0 is a special case: it is treated as the the target’s maximum memory address. (0xffff
on 16 bit targets, 0xffffffff on 32 bit targets, etc.)
delete mem
nums
...
Remove memory regions
nums
. . . .
disable mem
nums
...
Disable memory regions
nums
. . . . A disabled memory region is not forgotten. It may be enabled
again later.
enable mem
nums
...
Enable memory regions
nums
. . . .