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How to enable hardware breakpoint support


I have same problem on 2 different machines.

GBD can set only software breakpoint but not hardware.


gdb -q `which df`

(gdb) hb *0x400d70
No hardware breakpoint support in the target.

First machine is my workstation.

Intel(R) Pentium(R) 4 CPU 3.06GHz
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc
pebs bts pni dtes64 monitor ds_cpl tm2 cid cx16 xtpr lahf_lm

Linux miha-desktop 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16
20:36:48 UTC 2010 i686 GNU/Linux

GNU gdb (GDB) 7.2-ubuntu

Second one is server:

CPU: Intel(R) Xeon(R) CPU            5120  @ 1.86GHz (1862.06-MHz K8-class CPU)
AMD Features=0x20000800<SYSCALL,LM>
AMD Features2=0x1<LAHF>

FreeBSD 8.1-RELEASE-p1 Thu Oct  7 18:29:43 MSD 2010  amd64 custom kernel

GNU gdb 6.6 [GDB v6.6 for FreeBSD]
GNU gdb 6.1.1 [FreeBSD]

Laletin Michael

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