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2013-07-22 Edjunior Barbosa Machado <emachado@linux.vnet.ibm.com>

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* ppc-linux-nat.c (PPC_DEBUG_FEATURE_DATA_BP_DAWR): New define.
	(ppc_linux_region_ok_for_hw_watchpoint): Add checking to use the new
	DAWR interface for longer ranges hardware watchpoint (up to 512 bytes).
This commit is contained in:
Ulrich Weigand 2013-07-22 13:17:51 +00:00
parent eb013ee23c
commit e23b9d6ed2
2 changed files with 21 additions and 4 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2013-07-22 Edjunior Barbosa Machado <emachado@linux.vnet.ibm.com>
* ppc-linux-nat.c (PPC_DEBUG_FEATURE_DATA_BP_DAWR): New define.
(ppc_linux_region_ok_for_hw_watchpoint): Add checking to use the new
DAWR interface for longer ranges hardware watchpoint (up to 512 bytes).
2013-07-22 Phil Muldoon <pmuldoon@redhat.com>
* top.c (print_gdb_version): Add help, apropos description and

19
gdb/ppc-linux-nat.c
View File

@ -177,7 +177,11 @@ struct ppc_hw_breakpoint
(1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT))
#endif /* PPC_PTRACE_GETHWDBGINFO */
/* Feature defined on Linux kernel v3.9: DAWR interface, that enables wider
watchpoint (up to 512 bytes). */
#ifndef PPC_DEBUG_FEATURE_DATA_BP_DAWR
#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10
#endif /* PPC_DEBUG_FEATURE_DATA_BP_DAWR */
/* Similarly for the general-purpose (gp0 -- gp31)
and floating-point registers (fp0 -- fp31). */
@ -1504,6 +1508,7 @@ ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
watchpoints. */
if (have_ptrace_hwdebug_interface ())
{
int region_size;
/* Embedded DAC-based processors, like the PowerPC 440 have ranged
watchpoints and can watch any access within an arbitrary memory
region. This is useful to watch arrays and structs, for instance. It
@ -1512,11 +1517,17 @@ ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
&& hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_RANGE
&& ppc_linux_get_hwcap () & PPC_FEATURE_BOOKE)
return 2;
/* Check if the processor provides DAWR interface. */
if (hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_DAWR)
/* DAWR interface allows to watch up to 512 byte wide ranges which
can't cross a 512 byte boundary. */
region_size = 512;
else
region_size = hwdebug_info.data_bp_alignment;
/* Server processors provide one hardware watchpoint and addr+len should
fall in the watchable region provided by the ptrace interface. */
if (hwdebug_info.data_bp_alignment
&& (addr + len > (addr & ~(hwdebug_info.data_bp_alignment - 1))
+ hwdebug_info.data_bp_alignment))
if (region_size
&& (addr + len > (addr & ~(region_size - 1)) + region_size))
return 0;
}
/* addr+len must fall in the 8 byte watchable region for DABR-based