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[PATCH] Enable hw watchpoint with longer ranges using DAWR on Power
http://sourceware.org/ml/gdb-patches/2013-07/msg00085.html
http://sourceware.org/ml/gdb-cvs/2013-07/msg00097.html
### src/gdb/ChangeLog 2013/07/22 11:42:30 1.15812
### src/gdb/ChangeLog 2013/07/22 13:17:51 1.15813
## -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
--- gdb-7.6/gdb/ppc-linux-nat.c.orig 2013-07-24 17:39:30.434549279 +0200
+++ gdb-7.6/gdb/ppc-linux-nat.c 2013-07-24 17:41:31.337706502 +0200
@@ -178,7 +178,11 @@ 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). */
@@ -1503,6 +1507,7 @@ ppc_linux_region_ok_for_hw_watchpoint (C
to determine the hardcoded watchable region for watchpoints. */
if (have_ptrace_booke_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
@@ -1511,11 +1516,17 @@ ppc_linux_region_ok_for_hw_watchpoint (C
&& booke_debug_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 (booke_debug_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 = booke_debug_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 (booke_debug_info.data_bp_alignment
- && (addr + len > (addr & ~(booke_debug_info.data_bp_alignment - 1))
- + booke_debug_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