* [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
@ 2020-03-18 16:13 Kamil Rytarowski
2020-03-19 1:35 ` Simon Marchi
2020-03-19 13:08 ` [PATCH v2] " Kamil Rytarowski
0 siblings, 2 replies; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-18 16:13 UTC (permalink / raw)
To: gdb-patches; +Cc: simark, Kamil Rytarowski
Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
the pid,lwp pair to the calls on NetBSD; and the result of
get_ptrace_pid() on other BSD Operating Systems.
gdb/ChangeLog:
* x86-bsd-nat.c (gdb_ptrace): New.
* (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
---
gdb/ChangeLog | 5 +++++
gdb/x86-bsd-nat.c | 39 +++++++++++++++++++--------------------
2 files changed, 24 insertions(+), 20 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 84964dc00ac..1beb835df78 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-03-18 Kamil Rytarowski <n54@gmx.com>
+
+ * x86-bsd-nat.c (gdb_ptrace): New.
+ * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
+
2020-03-17 Kamil Rytarowski <n54@gmx.com>
* regformats/regdef.h: Put reg in gdb namespace.
diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
index 640a3c28110..37d0bfda37c 100644
--- a/gdb/x86-bsd-nat.c
+++ b/gdb/x86-bsd-nat.c
@@ -33,6 +33,19 @@
#include "inf-ptrace.h"
\f
+static int
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
+{
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
+
#ifdef PT_GETXSTATE_INFO
size_t x86bsd_xsave_len;
#endif
@@ -56,14 +69,9 @@ static unsigned long
x86bsd_dr_get (ptid_t ptid, int regnum)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't read debug registers"));
return DBREG_DRX ((&dbregs), regnum);
@@ -73,14 +81,9 @@ static void
x86bsd_dr_set (int regnum, unsigned long value)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't get debug registers"));
/* For some mysterious reason, some of the reserved bits in the
@@ -92,12 +95,8 @@ x86bsd_dr_set (int regnum, unsigned long value)
for (thread_info *thread : current_inferior ()->non_exited_threads ())
{
-#ifdef __NetBSD__
- lwp = thread->ptid.lwp ();
-#endif
-
- if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_SETDBREGS, thread->ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't write debug registers"));
}
}
--
2.25.0
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-18 16:13 [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c Kamil Rytarowski
@ 2020-03-19 1:35 ` Simon Marchi
2020-03-19 12:47 ` Kamil Rytarowski
2020-03-19 13:18 ` [PATCH v3] " Kamil Rytarowski
2020-03-19 13:08 ` [PATCH v2] " Kamil Rytarowski
1 sibling, 2 replies; 9+ messages in thread
From: Simon Marchi @ 2020-03-19 1:35 UTC (permalink / raw)
To: Kamil Rytarowski, gdb-patches
On 2020-03-18 12:13 p.m., Kamil Rytarowski wrote:
> Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
> the pid,lwp pair to the calls on NetBSD; and the result of
> get_ptrace_pid() on other BSD Operating Systems.
>
> gdb/ChangeLog:
>
> * x86-bsd-nat.c (gdb_ptrace): New.
> * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
> ---
> gdb/ChangeLog | 5 +++++
> gdb/x86-bsd-nat.c | 39 +++++++++++++++++++--------------------
> 2 files changed, 24 insertions(+), 20 deletions(-)
>
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 84964dc00ac..1beb835df78 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,3 +1,8 @@
> +2020-03-18 Kamil Rytarowski <n54@gmx.com>
> +
> + * x86-bsd-nat.c (gdb_ptrace): New.
> + * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
> +
> 2020-03-17 Kamil Rytarowski <n54@gmx.com>
>
> * regformats/regdef.h: Put reg in gdb namespace.
> diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
> index 640a3c28110..37d0bfda37c 100644
> --- a/gdb/x86-bsd-nat.c
> +++ b/gdb/x86-bsd-nat.c
> @@ -33,6 +33,19 @@
> #include "inf-ptrace.h"
> \f
>
> +static int
> +gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
> +{
> +#ifdef __NetBSD__
> + /* Support for NetBSD threads: unlike other ptrace implementations in this
> + file, NetBSD requires that we pass both the pid and lwp. */
> + return ptrace (request, ptid.pid (), addr, ptid.lwp ());
> +#else
> + pid_t pid = get_ptrace_pid (ptid);
> + return ptrace (request, pid, addr, 0);
> +#endif
> +}
> +
> #ifdef PT_GETXSTATE_INFO
> size_t x86bsd_xsave_len;
> #endif
> @@ -56,14 +69,9 @@ static unsigned long
> x86bsd_dr_get (ptid_t ptid, int regnum)
> {
> struct dbreg dbregs;
> -#ifdef __NetBSD__
> - int lwp = inferior_ptid.lwp ();
> -#else
> - int lwp = 0;
> -#endif
>
> - if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
> - (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
> + if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
> + (PTRACE_TYPE_ARG3) &dbregs) == -1)
> perror_with_name (_("Couldn't read debug registers"));
This function accepts a ptid parameter but does not use it. Can you change
it so it uses the parameter, and not inferior_ptid? All the callers pass
inferior_ptid, so it won't change the behavior.
>
> return DBREG_DRX ((&dbregs), regnum);
> @@ -73,14 +81,9 @@ static void
> x86bsd_dr_set (int regnum, unsigned long value)
> {
> struct dbreg dbregs;
> -#ifdef __NetBSD__
> - int lwp = inferior_ptid.lwp ();
> -#else
> - int lwp = 0;
> -#endif
>
> - if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
> - (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
> + if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
> + (PTRACE_TYPE_ARG3) &dbregs) == -1)
> perror_with_name (_("Couldn't get debug registers"));
For symmetry, can you please change this function to accept a ptid, just like
x86bsd_dr_get, and update the callers to pass inferior_ptid?
Simon
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 1:35 ` Simon Marchi
@ 2020-03-19 12:47 ` Kamil Rytarowski
2020-03-19 13:22 ` Simon Marchi
2020-03-19 13:18 ` [PATCH v3] " Kamil Rytarowski
1 sibling, 1 reply; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-19 12:47 UTC (permalink / raw)
To: Simon Marchi, gdb-patches
[-- Attachment #1.1: Type: text/plain, Size: 3464 bytes --]
On 19.03.2020 02:35, Simon Marchi wrote:
> On 2020-03-18 12:13 p.m., Kamil Rytarowski wrote:
>> Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
>> the pid,lwp pair to the calls on NetBSD; and the result of
>> get_ptrace_pid() on other BSD Operating Systems.
>>
>> gdb/ChangeLog:
>>
>> * x86-bsd-nat.c (gdb_ptrace): New.
>> * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
>> ---
>> gdb/ChangeLog | 5 +++++
>> gdb/x86-bsd-nat.c | 39 +++++++++++++++++++--------------------
>> 2 files changed, 24 insertions(+), 20 deletions(-)
>>
>> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
>> index 84964dc00ac..1beb835df78 100644
>> --- a/gdb/ChangeLog
>> +++ b/gdb/ChangeLog
>> @@ -1,3 +1,8 @@
>> +2020-03-18 Kamil Rytarowski <n54@gmx.com>
>> +
>> + * x86-bsd-nat.c (gdb_ptrace): New.
>> + * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
>> +
>> 2020-03-17 Kamil Rytarowski <n54@gmx.com>
>>
>> * regformats/regdef.h: Put reg in gdb namespace.
>> diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
>> index 640a3c28110..37d0bfda37c 100644
>> --- a/gdb/x86-bsd-nat.c
>> +++ b/gdb/x86-bsd-nat.c
>> @@ -33,6 +33,19 @@
>> #include "inf-ptrace.h"
>> \f
>>
>> +static int
>> +gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
>> +{
>> +#ifdef __NetBSD__
>> + /* Support for NetBSD threads: unlike other ptrace implementations in this
>> + file, NetBSD requires that we pass both the pid and lwp. */
>> + return ptrace (request, ptid.pid (), addr, ptid.lwp ());
>> +#else
>> + pid_t pid = get_ptrace_pid (ptid);
>> + return ptrace (request, pid, addr, 0);
>> +#endif
>> +}
>> +
>> #ifdef PT_GETXSTATE_INFO
>> size_t x86bsd_xsave_len;
>> #endif
>> @@ -56,14 +69,9 @@ static unsigned long
>> x86bsd_dr_get (ptid_t ptid, int regnum)
>> {
>> struct dbreg dbregs;
>> -#ifdef __NetBSD__
>> - int lwp = inferior_ptid.lwp ();
>> -#else
>> - int lwp = 0;
>> -#endif
>>
>> - if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
>> - (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
>> + if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
>> + (PTRACE_TYPE_ARG3) &dbregs) == -1)
>> perror_with_name (_("Couldn't read debug registers"));
>
> This function accepts a ptid parameter but does not use it. Can you change
> it so it uses the parameter, and not inferior_ptid? All the callers pass
> inferior_ptid, so it won't change the behavior.
>
OK.
>>
>> return DBREG_DRX ((&dbregs), regnum);
>> @@ -73,14 +81,9 @@ static void
>> x86bsd_dr_set (int regnum, unsigned long value)
>> {
>> struct dbreg dbregs;
>> -#ifdef __NetBSD__
>> - int lwp = inferior_ptid.lwp ();
>> -#else
>> - int lwp = 0;
>> -#endif
>>
>> - if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
>> - (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
>> + if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
>> + (PTRACE_TYPE_ARG3) &dbregs) == -1)
>> perror_with_name (_("Couldn't get debug registers"));
>
> For symmetry, can you please change this function to accept a ptid, just like
> x86bsd_dr_get, and update the callers to pass inferior_ptid?
>
This is a good idea.. however it is intrusive now and requires patching
code shared with windows, linux, darwin, ...
I prefer to leave it for refactoring in future. I don't have environment
to test other Operating Systems than NetBSD.
> Simon
>
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-18 16:13 [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c Kamil Rytarowski
2020-03-19 1:35 ` Simon Marchi
@ 2020-03-19 13:08 ` Kamil Rytarowski
1 sibling, 0 replies; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-19 13:08 UTC (permalink / raw)
To: gdb-patches; +Cc: simark, Kamil Rytarowski
Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
the pid,lwp pair to the calls on NetBSD; and the result of
get_ptrace_pid() on other BSD Operating Systems.
gdb/ChangeLog:
* x86-bsd-nat.c (gdb_ptrace): New.
* (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
---
gdb/ChangeLog | 5 +++++
gdb/x86-bsd-nat.c | 38 ++++++++++++++++++--------------------
2 files changed, 23 insertions(+), 20 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7f87eceaf70..23a5932489f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-03-19 Kamil Rytarowski <n54@gmx.com>
+
+ * x86-bsd-nat.c (gdb_ptrace): New.
+ * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
+
2020-03-19 Andrew Burgess <andrew.burgess@embecosm.com>
* remote.c (remote_target::process_stop_reply): Handle events for
diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
index 640a3c28110..c1da7d6ce30 100644
--- a/gdb/x86-bsd-nat.c
+++ b/gdb/x86-bsd-nat.c
@@ -33,6 +33,19 @@
#include "inf-ptrace.h"
\f
+static int
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
+{
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
+
#ifdef PT_GETXSTATE_INFO
size_t x86bsd_xsave_len;
#endif
@@ -56,14 +69,8 @@ static unsigned long
x86bsd_dr_get (ptid_t ptid, int regnum)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
perror_with_name (_("Couldn't read debug registers"));
return DBREG_DRX ((&dbregs), regnum);
@@ -73,14 +80,9 @@ static void
x86bsd_dr_set (int regnum, unsigned long value)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
+ (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
perror_with_name (_("Couldn't get debug registers"));
/* For some mysterious reason, some of the reserved bits in the
@@ -92,12 +94,8 @@ x86bsd_dr_set (int regnum, unsigned long value)
for (thread_info *thread : current_inferior ()->non_exited_threads ())
{
-#ifdef __NetBSD__
- lwp = thread->ptid.lwp ();
-#endif
-
- if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_SETDBREGS, thread->ptid,
+ (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
perror_with_name (_("Couldn't write debug registers"));
}
}
--
2.25.0
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v3] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 1:35 ` Simon Marchi
2020-03-19 12:47 ` Kamil Rytarowski
@ 2020-03-19 13:18 ` Kamil Rytarowski
2020-03-19 13:36 ` [PATCH v4] " Kamil Rytarowski
1 sibling, 1 reply; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-19 13:18 UTC (permalink / raw)
To: gdb-patches; +Cc: simark, Kamil Rytarowski
Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
the pid,lwp pair to the calls on NetBSD; and the result of
get_ptrace_pid() on other BSD Operating Systems.
gdb/ChangeLog:
* x86-bsd-nat.c (gdb_ptrace): New.
* (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
---
gdb/ChangeLog | 5 +++++
gdb/x86-bsd-nat.c | 38 ++++++++++++++++++--------------------
2 files changed, 23 insertions(+), 20 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7f87eceaf70..23a5932489f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-03-19 Kamil Rytarowski <n54@gmx.com>
+
+ * x86-bsd-nat.c (gdb_ptrace): New.
+ * (x86bsd_dr_get, x86bsd_dr_set): Use gdb_ptrace.
+
2020-03-19 Andrew Burgess <andrew.burgess@embecosm.com>
* remote.c (remote_target::process_stop_reply): Handle events for
diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
index 640a3c28110..4332cb717bc 100644
--- a/gdb/x86-bsd-nat.c
+++ b/gdb/x86-bsd-nat.c
@@ -33,6 +33,19 @@
#include "inf-ptrace.h"
\f
+static int
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
+{
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
+
#ifdef PT_GETXSTATE_INFO
size_t x86bsd_xsave_len;
#endif
@@ -56,14 +69,8 @@ static unsigned long
x86bsd_dr_get (ptid_t ptid, int regnum)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't read debug registers"));
return DBREG_DRX ((&dbregs), regnum);
@@ -73,14 +80,9 @@ static void
x86bsd_dr_set (int regnum, unsigned long value)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, inferior_ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't get debug registers"));
/* For some mysterious reason, some of the reserved bits in the
@@ -92,12 +94,8 @@ x86bsd_dr_set (int regnum, unsigned long value)
for (thread_info *thread : current_inferior ()->non_exited_threads ())
{
-#ifdef __NetBSD__
- lwp = thread->ptid.lwp ();
-#endif
-
- if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_SETDBREGS, thread->ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't write debug registers"));
}
}
--
2.25.0
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 12:47 ` Kamil Rytarowski
@ 2020-03-19 13:22 ` Simon Marchi
2020-03-19 13:36 ` Kamil Rytarowski
0 siblings, 1 reply; 9+ messages in thread
From: Simon Marchi @ 2020-03-19 13:22 UTC (permalink / raw)
To: Kamil Rytarowski, gdb-patches
On 2020-03-19 8:47 a.m., Kamil Rytarowski wrote:
> This is a good idea.. however it is intrusive now and requires patching
> code shared with windows, linux, darwin, ...
>
> I prefer to leave it for refactoring in future. I don't have environment
> to test other Operating Systems than NetBSD.
Hmm no, the callers of x86bsd_dr_set are only in this file (x86bsd_dr_set_control and
x86bsd_dr_set_addr). They would now look like this:
static void
x86bsd_dr_set_control (unsigned long control)
{
x86bsd_dr_set (inferior_ptid, 7, control);
}
static void
x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= 4);
x86bsd_dr_set (inferior_ptid, regnum, addr);
}
Adding a ptid parameter to x86bsd_dr_set_control and x86bsd_dr_set_addr would be the
next logical step, but that indeed would be a more intrusive change, so I don't suggest
doing that right now.
Simon
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v4] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 13:18 ` [PATCH v3] " Kamil Rytarowski
@ 2020-03-19 13:36 ` Kamil Rytarowski
2020-03-19 13:40 ` Simon Marchi
0 siblings, 1 reply; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-19 13:36 UTC (permalink / raw)
To: gdb-patches; +Cc: simark, Kamil Rytarowski
Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
the pid,lwp pair to the calls on NetBSD; and the result of
get_ptrace_pid() on other BSD Operating Systems.
gdb/ChangeLog:
* x86-bsd-nat.c (gdb_ptrace): New.
* (x86bsd_dr_set): Add new argument `ptid'.
* (x86bsd_dr_get, x86bsd_dr_set, x86bsd_dr_set_control,
x86bsd_dr_set_addr): Update.
---
gdb/ChangeLog | 7 +++++++
gdb/x86-bsd-nat.c | 43 ++++++++++++++++++++-----------------------
2 files changed, 27 insertions(+), 23 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7f87eceaf70..0955d648e79 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2020-03-19 Kamil Rytarowski <n54@gmx.com>
+
+ * x86-bsd-nat.c (gdb_ptrace): New.
+ * (x86bsd_dr_set): Add new argument `ptid'.
+ * (x86bsd_dr_get, x86bsd_dr_set, x86bsd_dr_set_control,
+ x86bsd_dr_set_addr): Update.
+
2020-03-19 Andrew Burgess <andrew.burgess@embecosm.com>
* remote.c (remote_target::process_stop_reply): Handle events for
diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
index 640a3c28110..9e2bea1e020 100644
--- a/gdb/x86-bsd-nat.c
+++ b/gdb/x86-bsd-nat.c
@@ -33,6 +33,19 @@
#include "inf-ptrace.h"
\f
+static int
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
+{
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
+
#ifdef PT_GETXSTATE_INFO
size_t x86bsd_xsave_len;
#endif
@@ -56,31 +69,19 @@ static unsigned long
x86bsd_dr_get (ptid_t ptid, int regnum)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't read debug registers"));
return DBREG_DRX ((&dbregs), regnum);
}
static void
-x86bsd_dr_set (int regnum, unsigned long value)
+x86bsd_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
struct dbreg dbregs;
-#ifdef __NetBSD__
- int lwp = inferior_ptid.lwp ();
-#else
- int lwp = 0;
-#endif
- if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't get debug registers"));
/* For some mysterious reason, some of the reserved bits in the
@@ -92,12 +93,8 @@ x86bsd_dr_set (int regnum, unsigned long value)
for (thread_info *thread : current_inferior ()->non_exited_threads ())
{
-#ifdef __NetBSD__
- lwp = thread->ptid.lwp ();
-#endif
-
- if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
- (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1)
+ if (gdb_ptrace (PT_SETDBREGS, thread->ptid,
+ (PTRACE_TYPE_ARG3) &dbregs) == -1)
perror_with_name (_("Couldn't write debug registers"));
}
}
@@ -105,7 +102,7 @@ x86bsd_dr_set (int regnum, unsigned long value)
static void
x86bsd_dr_set_control (unsigned long control)
{
- x86bsd_dr_set (7, control);
+ x86bsd_dr_set (inferior_ptid, 7, control);
}
static void
@@ -113,7 +110,7 @@ x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= 4);
- x86bsd_dr_set (regnum, addr);
+ x86bsd_dr_set (inferior_ptid, regnum, addr);
}
static CORE_ADDR
--
2.25.0
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 13:22 ` Simon Marchi
@ 2020-03-19 13:36 ` Kamil Rytarowski
0 siblings, 0 replies; 9+ messages in thread
From: Kamil Rytarowski @ 2020-03-19 13:36 UTC (permalink / raw)
To: Simon Marchi, gdb-patches
[-- Attachment #1.1: Type: text/plain, Size: 1050 bytes --]
On 19.03.2020 14:22, Simon Marchi wrote:
> On 2020-03-19 8:47 a.m., Kamil Rytarowski wrote:
>> This is a good idea.. however it is intrusive now and requires patching
>> code shared with windows, linux, darwin, ...
>>
>> I prefer to leave it for refactoring in future. I don't have environment
>> to test other Operating Systems than NetBSD.
>
> Hmm no, the callers of x86bsd_dr_set are only in this file (x86bsd_dr_set_control and
> x86bsd_dr_set_addr). They would now look like this:
>
> static void
> x86bsd_dr_set_control (unsigned long control)
> {
> x86bsd_dr_set (inferior_ptid, 7, control);
> }
>
> static void
> x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
> {
> gdb_assert (regnum >= 0 && regnum <= 4);
>
> x86bsd_dr_set (inferior_ptid, regnum, addr);
> }
>
> Adding a ptid parameter to x86bsd_dr_set_control and x86bsd_dr_set_addr would be the
> next logical step, but that indeed would be a more intrusive change, so I don't suggest
> doing that right now.
>
Done in v4.
> Simon
>
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v4] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c
2020-03-19 13:36 ` [PATCH v4] " Kamil Rytarowski
@ 2020-03-19 13:40 ` Simon Marchi
0 siblings, 0 replies; 9+ messages in thread
From: Simon Marchi @ 2020-03-19 13:40 UTC (permalink / raw)
To: Kamil Rytarowski, gdb-patches
On 2020-03-19 9:36 a.m., Kamil Rytarowski wrote:
> Add gdb_ptrace() that wraps the ptrace(2) API and correctly passes
> the pid,lwp pair to the calls on NetBSD; and the result of
> get_ptrace_pid() on other BSD Operating Systems.
Thanks. I can't test, but by inspection this patch LGTM.
Simon
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2020-03-19 13:40 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-18 16:13 [PATCH] Avoid get_ptrace_pid() usage on NetBSD in x86-bsd-nat.c Kamil Rytarowski
2020-03-19 1:35 ` Simon Marchi
2020-03-19 12:47 ` Kamil Rytarowski
2020-03-19 13:22 ` Simon Marchi
2020-03-19 13:36 ` Kamil Rytarowski
2020-03-19 13:18 ` [PATCH v3] " Kamil Rytarowski
2020-03-19 13:36 ` [PATCH v4] " Kamil Rytarowski
2020-03-19 13:40 ` Simon Marchi
2020-03-19 13:08 ` [PATCH v2] " Kamil Rytarowski
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 read-only IMAP folder(s) and NNTP newsgroup(s).