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* [glibc/fw/unwind-link] sparc: Implement backtrace on top <unwind-link.h>
@ 2020-02-10 17:09 Florian Weimer
  0 siblings, 0 replies; 3+ messages in thread
From: Florian Weimer @ 2020-02-10 17:09 UTC (permalink / raw)
  To: glibc-cvs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=126a8bdf664b48e589350be38d6cc8c517607912

commit 126a8bdf664b48e589350be38d6cc8c517607912
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Feb 10 16:07:03 2020 +0100

    sparc: Implement backtrace on top <unwind-link.h>

Diff:
---
 sysdeps/sparc/backtrace.c | 69 +++++++++++------------------------------------
 1 file changed, 16 insertions(+), 53 deletions(-)

diff --git a/sysdeps/sparc/backtrace.c b/sysdeps/sparc/backtrace.c
index 297da33..98590c8 100644
--- a/sysdeps/sparc/backtrace.c
+++ b/sysdeps/sparc/backtrace.c
@@ -18,12 +18,10 @@
    not, see <https://www.gnu.org/licenses/>.  */
 
 #include <execinfo.h>
-#include <stddef.h>
-#include <sysdep.h>
+#include <stdlib.h>
 #include <sys/trap.h>
-#include <dlfcn.h>
-#include <unwind.h>
 #include <backtrace.h>
+#include <unwind-link.h>
 
 struct layout
 {
@@ -36,45 +34,12 @@ struct layout
 struct trace_arg
 {
   void **array;
+  struct unwind_link *unwind_link;
   _Unwind_Word cfa;
   int cnt;
   int size;
 };
 
-#ifdef SHARED
-static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
-static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
-static _Unwind_Word (*unwind_getcfa) (struct _Unwind_Context *);
-static void *libgcc_handle;
-
-/* Dummy version in case libgcc_s does not contain the real code.  */
-static _Unwind_Word
-dummy_getcfa (struct _Unwind_Context *ctx __attribute__ ((unused)))
-{
-  return 0;
-}
-
-static void
-init (void)
-{
-  libgcc_handle = __libc_dlopen ("libgcc_s.so.1");
-
-  if (libgcc_handle == NULL)
-    return;
-
-  unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
-  unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
-  if (unwind_getip == NULL)
-    unwind_backtrace = NULL;
-  unwind_getcfa = (__libc_dlsym (libgcc_handle, "_Unwind_GetCFA")
-		  ?: dummy_getcfa);
-}
-#else
-# define unwind_backtrace _Unwind_Backtrace
-# define unwind_getip _Unwind_GetIP
-# define unwind_getcfa _Unwind_GetCFA
-#endif
-
 static _Unwind_Reason_Code
 backtrace_helper (struct _Unwind_Context *ctx, void *a)
 {
@@ -85,11 +50,12 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
      Skip it.  */
   if (arg->cnt != -1)
     {
-      ip = unwind_getip (ctx);
+      ip = UNWIND_LINK_CALL (arg->unwind_link, _Unwind_GetIP, ctx);
       arg->array[arg->cnt] = (void *) ip;
 
       /* Check whether we make any progress.  */
-      _Unwind_Word cfa = unwind_getcfa (ctx);
+      _Unwind_Word cfa
+	= UNWIND_LINK_CALL (arg->unwind_link, _Unwind_GetCFA, ctx);
 
       if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
 	 && cfa == arg->cfa)
@@ -104,23 +70,19 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
 int
 __backtrace (void **array, int size)
 {
-  struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 };
-  bool use_unwinder;
   int count;
+  struct trace_arg arg =
+    {
+     .array = array,
+     .unwind_link = __libc_unwind_link_get (),
+     .size = size,
+     .cnt = -1,
+    };
 
   if (size <= 0)
     return 0;
 
-  use_unwinder = true;
-#ifdef SHARED
-  __libc_once_define (static, once);
-
-  __libc_once (once, init);
-  if (unwind_backtrace == NULL)
-    use_unwinder = false;
-#endif
-
-  if (use_unwinder == false)
+  if (arg.unwind_link == NULL)
     {
       struct layout *current;
       unsigned long fp, i7;
@@ -145,7 +107,8 @@ __backtrace (void **array, int size)
     }
   else
     {
-      unwind_backtrace (backtrace_helper, &arg);
+      UNWIND_LINK_CALL (arg.unwind_link, _Unwind_Backtrace,
+			backtrace_helper, &arg);
 
       /* _Unwind_Backtrace seems to put NULL address above
 	 _start.  Fix it up here.  */


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [glibc/fw/unwind-link] sparc: Implement backtrace on top <unwind-link.h>
@ 2020-02-13 16:22 Florian Weimer
  0 siblings, 0 replies; 3+ messages in thread
From: Florian Weimer @ 2020-02-13 16:22 UTC (permalink / raw)
  To: glibc-cvs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1f5c45ee2350ab841dea8afc3b3b3376dd4c8f3c

commit 1f5c45ee2350ab841dea8afc3b3b3376dd4c8f3c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Feb 10 22:58:05 2020 +0100

    sparc: Implement backtrace on top <unwind-link.h>

Diff:
---
 sysdeps/sparc/backtrace.c | 66 +++++++++++------------------------------------
 1 file changed, 15 insertions(+), 51 deletions(-)

diff --git a/sysdeps/sparc/backtrace.c b/sysdeps/sparc/backtrace.c
index 297da33..8cedf7f 100644
--- a/sysdeps/sparc/backtrace.c
+++ b/sysdeps/sparc/backtrace.c
@@ -21,9 +21,8 @@
 #include <stddef.h>
 #include <sysdep.h>
 #include <sys/trap.h>
-#include <dlfcn.h>
-#include <unwind.h>
 #include <backtrace.h>
+#include <unwind-link.h>
 
 struct layout
 {
@@ -36,45 +35,12 @@ struct layout
 struct trace_arg
 {
   void **array;
+  struct unwind_link *unwind_link;
   _Unwind_Word cfa;
   int cnt;
   int size;
 };
 
-#ifdef SHARED
-static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
-static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
-static _Unwind_Word (*unwind_getcfa) (struct _Unwind_Context *);
-static void *libgcc_handle;
-
-/* Dummy version in case libgcc_s does not contain the real code.  */
-static _Unwind_Word
-dummy_getcfa (struct _Unwind_Context *ctx __attribute__ ((unused)))
-{
-  return 0;
-}
-
-static void
-init (void)
-{
-  libgcc_handle = __libc_dlopen ("libgcc_s.so.1");
-
-  if (libgcc_handle == NULL)
-    return;
-
-  unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
-  unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
-  if (unwind_getip == NULL)
-    unwind_backtrace = NULL;
-  unwind_getcfa = (__libc_dlsym (libgcc_handle, "_Unwind_GetCFA")
-		  ?: dummy_getcfa);
-}
-#else
-# define unwind_backtrace _Unwind_Backtrace
-# define unwind_getip _Unwind_GetIP
-# define unwind_getcfa _Unwind_GetCFA
-#endif
-
 static _Unwind_Reason_Code
 backtrace_helper (struct _Unwind_Context *ctx, void *a)
 {
@@ -85,11 +51,12 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
      Skip it.  */
   if (arg->cnt != -1)
     {
-      ip = unwind_getip (ctx);
+      ip = UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
       arg->array[arg->cnt] = (void *) ip;
 
       /* Check whether we make any progress.  */
-      _Unwind_Word cfa = unwind_getcfa (ctx);
+      _Unwind_Word cfa
+	= UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
 
       if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
 	 && cfa == arg->cfa)
@@ -104,23 +71,19 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
 int
 __backtrace (void **array, int size)
 {
-  struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 };
-  bool use_unwinder;
   int count;
+  struct trace_arg arg =
+    {
+     .array = array,
+     .unwind_link = __libc_unwind_link_get (),
+     .size = size,
+     .cnt = -1,
+    };
 
   if (size <= 0)
     return 0;
 
-  use_unwinder = true;
-#ifdef SHARED
-  __libc_once_define (static, once);
-
-  __libc_once (once, init);
-  if (unwind_backtrace == NULL)
-    use_unwinder = false;
-#endif
-
-  if (use_unwinder == false)
+  if (arg.unwind_link == NULL)
     {
       struct layout *current;
       unsigned long fp, i7;
@@ -145,7 +108,8 @@ __backtrace (void **array, int size)
     }
   else
     {
-      unwind_backtrace (backtrace_helper, &arg);
+      UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
+	(backtrace_helper, &arg);
 
       /* _Unwind_Backtrace seems to put NULL address above
 	 _start.  Fix it up here.  */


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [glibc/fw/unwind-link] sparc: Implement backtrace on top <unwind-link.h>
@ 2020-02-13 10:46 Florian Weimer
  0 siblings, 0 replies; 3+ messages in thread
From: Florian Weimer @ 2020-02-13 10:46 UTC (permalink / raw)
  To: glibc-cvs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bc5d5115151bc08e6d49fe03f9cf62c82b0860ea

commit bc5d5115151bc08e6d49fe03f9cf62c82b0860ea
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Feb 10 22:58:05 2020 +0100

    sparc: Implement backtrace on top <unwind-link.h>

Diff:
---
 sysdeps/sparc/backtrace.c | 66 +++++++++++------------------------------------
 1 file changed, 15 insertions(+), 51 deletions(-)

diff --git a/sysdeps/sparc/backtrace.c b/sysdeps/sparc/backtrace.c
index 297da33..8cedf7f 100644
--- a/sysdeps/sparc/backtrace.c
+++ b/sysdeps/sparc/backtrace.c
@@ -21,9 +21,8 @@
 #include <stddef.h>
 #include <sysdep.h>
 #include <sys/trap.h>
-#include <dlfcn.h>
-#include <unwind.h>
 #include <backtrace.h>
+#include <unwind-link.h>
 
 struct layout
 {
@@ -36,45 +35,12 @@ struct layout
 struct trace_arg
 {
   void **array;
+  struct unwind_link *unwind_link;
   _Unwind_Word cfa;
   int cnt;
   int size;
 };
 
-#ifdef SHARED
-static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
-static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
-static _Unwind_Word (*unwind_getcfa) (struct _Unwind_Context *);
-static void *libgcc_handle;
-
-/* Dummy version in case libgcc_s does not contain the real code.  */
-static _Unwind_Word
-dummy_getcfa (struct _Unwind_Context *ctx __attribute__ ((unused)))
-{
-  return 0;
-}
-
-static void
-init (void)
-{
-  libgcc_handle = __libc_dlopen ("libgcc_s.so.1");
-
-  if (libgcc_handle == NULL)
-    return;
-
-  unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
-  unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
-  if (unwind_getip == NULL)
-    unwind_backtrace = NULL;
-  unwind_getcfa = (__libc_dlsym (libgcc_handle, "_Unwind_GetCFA")
-		  ?: dummy_getcfa);
-}
-#else
-# define unwind_backtrace _Unwind_Backtrace
-# define unwind_getip _Unwind_GetIP
-# define unwind_getcfa _Unwind_GetCFA
-#endif
-
 static _Unwind_Reason_Code
 backtrace_helper (struct _Unwind_Context *ctx, void *a)
 {
@@ -85,11 +51,12 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
      Skip it.  */
   if (arg->cnt != -1)
     {
-      ip = unwind_getip (ctx);
+      ip = UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
       arg->array[arg->cnt] = (void *) ip;
 
       /* Check whether we make any progress.  */
-      _Unwind_Word cfa = unwind_getcfa (ctx);
+      _Unwind_Word cfa
+	= UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
 
       if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
 	 && cfa == arg->cfa)
@@ -104,23 +71,19 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
 int
 __backtrace (void **array, int size)
 {
-  struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 };
-  bool use_unwinder;
   int count;
+  struct trace_arg arg =
+    {
+     .array = array,
+     .unwind_link = __libc_unwind_link_get (),
+     .size = size,
+     .cnt = -1,
+    };
 
   if (size <= 0)
     return 0;
 
-  use_unwinder = true;
-#ifdef SHARED
-  __libc_once_define (static, once);
-
-  __libc_once (once, init);
-  if (unwind_backtrace == NULL)
-    use_unwinder = false;
-#endif
-
-  if (use_unwinder == false)
+  if (arg.unwind_link == NULL)
     {
       struct layout *current;
       unsigned long fp, i7;
@@ -145,7 +108,8 @@ __backtrace (void **array, int size)
     }
   else
     {
-      unwind_backtrace (backtrace_helper, &arg);
+      UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
+	(backtrace_helper, &arg);
 
       /* _Unwind_Backtrace seems to put NULL address above
 	 _start.  Fix it up here.  */


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-02-13 16:22 UTC | newest]

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2020-02-10 17:09 [glibc/fw/unwind-link] sparc: Implement backtrace on top <unwind-link.h> Florian Weimer
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