8da52f9fa5
- Backport from master [jsc#13656]: * gdb-powerpc-remove-512-bytes-region-limit-if-2nd-dawr-is-avaliable.patch - Require 8GB diskspace for x86_64. OBS-URL: https://build.opensuse.org/request/show/854204 OBS-URL: https://build.opensuse.org/package/show/devel:gcc/gdb?expand=0&rev=267
73 lines
2.8 KiB
Diff
73 lines
2.8 KiB
Diff
PowerPC remove 512 bytes region limit if 2nd DAWR is avaliable.
|
|
|
|
Power 10 introduces the 2nd DAWR (second watchpoint) and also removed
|
|
a restriction that limit the watch region to 512 bytes.
|
|
|
|
2020-11-08 Rogerio A. Cardoso <rcardoso@linux.ibm.com>
|
|
|
|
/gdb
|
|
|
|
* ppc-linux-nat.c: (PPC_DEBUG_FEATURE_DATA_BP_ARCH_31): New define.
|
|
(region_ok_for_hw_watchpoint): Check if 2nd DAWR is avaliable before
|
|
set region.
|
|
|
|
---
|
|
gdb/ppc-linux-nat.c | 26 ++++++++++++++++++--------
|
|
2 files changed, 23 insertions(+), 8 deletions(-)
|
|
|
|
Index: gdb-10.1/gdb/ppc-linux-nat.c
|
|
===================================================================
|
|
--- gdb-10.1.orig/gdb/ppc-linux-nat.c
|
|
+++ gdb-10.1/gdb/ppc-linux-nat.c
|
|
@@ -138,6 +138,11 @@ struct ppc_hw_breakpoint
|
|
#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10
|
|
#endif /* PPC_DEBUG_FEATURE_DATA_BP_DAWR */
|
|
|
|
+/* Feature defined on Linux kernel v5.1: Second watchpoint support. */
|
|
+#ifndef PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
|
|
+#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x20
|
|
+#endif /* PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 */
|
|
+
|
|
/* The version of the PowerPC HWDEBUG kernel interface that we will use, if
|
|
available. */
|
|
#define PPC_DEBUG_CURRENT_VERSION 1
|
|
@@ -2108,9 +2113,10 @@ ppc_linux_nat_target::region_ok_for_hw_w
|
|
watchpoints. */
|
|
if (m_dreg_interface.hwdebug_p ())
|
|
{
|
|
- int region_size;
|
|
const struct ppc_debug_info &hwdebug_info = (m_dreg_interface
|
|
.hwdebug_info ());
|
|
+ int region_size = hwdebug_info.data_bp_alignment;
|
|
+ int region_align = region_size;
|
|
|
|
/* Embedded DAC-based processors, like the PowerPC 440 have ranged
|
|
watchpoints and can watch any access within an arbitrary memory
|
|
@@ -2122,15 +2128,19 @@ ppc_linux_nat_target::region_ok_for_hw_w
|
|
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;
|
|
+ {
|
|
+ /* DAWR interface allows to watch up to 512 byte wide ranges. */
|
|
+ region_size = 512;
|
|
+ /* DAWR interface allows to watch up to 512 byte wide ranges which
|
|
+ can't cross a 512 byte bondary on machines that doesn't have a
|
|
+ second DAWR (P9 or less). */
|
|
+ if (!(hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_ARCH_31))
|
|
+ region_align = 512;
|
|
+ }
|
|
/* Server processors provide one hardware watchpoint and addr+len should
|
|
fall in the watchable region provided by the ptrace interface. */
|
|
- if (region_size
|
|
- && (addr + len > (addr & ~(region_size - 1)) + region_size))
|
|
+ if (region_align
|
|
+ && (addr + len > (addr & ~(region_align - 1)) + region_size))
|
|
return 0;
|
|
}
|
|
/* addr+len must fall in the 8 byte watchable region for DABR-based
|