From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
To: mpe@ellerman.id.au, christophe.leroy@c-s.fr
Cc: ravi.bangoria@linux.ibm.com, mikey@neuling.org, paulus@samba.org,
naveen.n.rao@linux.vnet.ibm.com, pedromfc@br.ibm.com,
rogealve@br.ibm.com, jniethe5@gmail.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 5/6] powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
Date: Mon, 17 Aug 2020 15:53:29 +0530 [thread overview]
Message-ID: <20200817102330.777537-6-ravi.bangoria@linux.ibm.com> (raw)
In-Reply-To: <20200817102330.777537-1-ravi.bangoria@linux.ibm.com>
PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 can be used to determine whether
we are running on an ISA 3.1 compliant machine. Which is needed to
determine DAR behaviour, 512 byte boundary limit etc. This was
requested by Pedro Miraglia Franco de Carvalho for extending
watchpoint features in gdb. Note that availability of 2nd DAWR is
independent of this flag and should be checked using
ppc_debug_info->num_data_bps.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
Documentation/powerpc/ptrace.rst | 1 +
arch/powerpc/include/uapi/asm/ptrace.h | 1 +
arch/powerpc/kernel/ptrace/ptrace-noadv.c | 2 ++
3 files changed, 4 insertions(+)
diff --git a/Documentation/powerpc/ptrace.rst b/Documentation/powerpc/ptrace.rst
index 864d4b6dddd1..77725d69eb4a 100644
--- a/Documentation/powerpc/ptrace.rst
+++ b/Documentation/powerpc/ptrace.rst
@@ -46,6 +46,7 @@ features will have bits indicating whether there is support for::
#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x4
#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x8
#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10
+ #define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x20
2. PTRACE_SETHWDEBUG
diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h
index f5f1ccc740fc..7004cfea3f5f 100644
--- a/arch/powerpc/include/uapi/asm/ptrace.h
+++ b/arch/powerpc/include/uapi/asm/ptrace.h
@@ -222,6 +222,7 @@ struct ppc_debug_info {
#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x0000000000000004
#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x0000000000000008
#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x0000000000000010
+#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x0000000000000020
#ifndef __ASSEMBLY__
diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
index 081c39842d84..1d0235db3c1b 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c
+++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
@@ -57,6 +57,8 @@ void ppc_gethwdinfo(struct ppc_debug_info *dbginfo)
} else {
dbginfo->features = 0;
}
+ if (cpu_has_feature(CPU_FTR_ARCH_31))
+ dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_ARCH_31;
}
int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
--
2.26.2
next prev parent reply other threads:[~2020-08-17 10:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 10:23 [PATCH v4 0/6] powerpc/watchpoint: Bug fixes plus new feature flag Ravi Bangoria
2020-08-17 10:23 ` [PATCH v4 1/6] powerpc/watchpoint/ptrace: Fix SETHWDEBUG when CONFIG_HAVE_HW_BREAKPOINT=N Ravi Bangoria
2020-08-17 10:23 ` [PATCH v4 2/6] powerpc/watchpoint: Move DAWR detection logic outside of hw_breakpoint.c Ravi Bangoria
2020-08-17 10:23 ` [PATCH v4 3/6] powerpc/watchpoint: Fix exception handling for CONFIG_HAVE_HW_BREAKPOINT=N Ravi Bangoria
2020-08-17 10:23 ` [PATCH v4 4/6] powerpc/watchpoint: Add hw_len wherever missing Ravi Bangoria
2020-08-17 10:23 ` Ravi Bangoria [this message]
2020-08-17 10:23 ` [PATCH v4 6/6] powerpc/watchpoint/selftests: Tests for kernel accessing user memory Ravi Bangoria
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200817102330.777537-6-ravi.bangoria@linux.ibm.com \
--to=ravi.bangoria@linux.ibm.com \
--cc=christophe.leroy@c-s.fr \
--cc=jniethe5@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=mpe@ellerman.id.au \
--cc=naveen.n.rao@linux.vnet.ibm.com \
--cc=paulus@samba.org \
--cc=pedromfc@br.ibm.com \
--cc=rogealve@br.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).