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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Rogerio Alves <rcardoso@linux.ibm.com>
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Date: Wed, 7 Jul 2021 19:06:52 -0400
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Subject: gdb-rhbz1854784-powerpc-remove-region-limit-dawr-7of7.patch
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;; Backport "PowerPC remove 512 bytes region limit if 2nd DAWR is available."
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;; (Rogerio Alves, RH BZ 1854784)
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Power 10 introduces the 2nd DAWR (second watchpoint) and also removed
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a restriction that limit the watch region to 512 bytes.
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2020-11-08 Rogerio A. Cardoso <rcardoso@linux.ibm.com>
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/gdb
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* ppc-linux-nat.c: (PPC_DEBUG_FEATURE_DATA_BP_ARCH_31): New define.
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(region_ok_for_hw_watchpoint): Check if 2nd DAWR is avaliable before
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set region.
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diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
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--- a/gdb/ppc-linux-nat.c
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+++ b/gdb/ppc-linux-nat.c
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@@ -144,6 +144,11 @@ struct ppc_hw_breakpoint
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#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10
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#endif /* PPC_DEBUG_FEATURE_DATA_BP_DAWR */
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+/* Feature defined on Linux kernel v5.1: Second watchpoint support. */
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+#ifndef PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
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+#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x20
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+#endif /* PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 */
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+
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/* The version of the PowerPC HWDEBUG kernel interface that we will use, if
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available. */
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#define PPC_DEBUG_CURRENT_VERSION 1
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@@ -2121,9 +2126,10 @@ ppc_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
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watchpoints. */
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if (m_dreg_interface.hwdebug_p ())
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{
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- int region_size;
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const struct ppc_debug_info &hwdebug_info = (m_dreg_interface
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.hwdebug_info ());
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+ int region_size = hwdebug_info.data_bp_alignment;
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+ int region_align = region_size;
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/* Embedded DAC-based processors, like the PowerPC 440 have ranged
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watchpoints and can watch any access within an arbitrary memory
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@@ -2135,15 +2141,19 @@ ppc_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
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return 2;
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/* Check if the processor provides DAWR interface. */
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if (hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_DAWR)
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- /* DAWR interface allows to watch up to 512 byte wide ranges which
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- can't cross a 512 byte boundary. */
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- region_size = 512;
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- else
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- region_size = hwdebug_info.data_bp_alignment;
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+ {
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+ /* DAWR interface allows to watch up to 512 byte wide ranges. */
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+ region_size = 512;
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+ /* DAWR interface allows to watch up to 512 byte wide ranges which
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+ can't cross a 512 byte bondary on machines that doesn't have a
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+ second DAWR (P9 or less). */
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+ if (!(hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_ARCH_31))
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+ region_align = 512;
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+ }
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/* Server processors provide one hardware watchpoint and addr+len should
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fall in the watchable region provided by the ptrace interface. */
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- if (region_size
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- && (addr + len > (addr & ~(region_size - 1)) + region_size))
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+ if (region_align
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+ && (addr + len > (addr & ~(region_align - 1)) + region_size))
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return 0;
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}
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/* addr+len must fall in the 8 byte watchable region for DABR-based
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