From 82fd7314c7df8c5555dce027df6f2c98ca5a927f Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 12 Feb 2021 19:20:27 +0300
Subject: powerpc: Remove backtrace implementation

The powerpc optimization to provide a fast stacktrace requires some
ad-hoc code to handle Linux signal frames and the change is fragile
once the kernel decides to slight change its execution sequence [1].

The generic implementation work as-is and it should be future proof
since the kernel provides the expected CFI directives in vDSO shared
page.

Checked on powerpc-linux-gnu, powerpc64le-linux-gnu, and
powerpc64-linux-gnu.

[1] https://sourceware.org/pipermail/libc-alpha/2021-January/122027.html
---
 sysdeps/unix/sysv/linux/dl-vdso-setup.c  | 11 -----------
 sysdeps/unix/sysv/linux/dl-vdso-setup.h  |  9 ---------
 sysdeps/unix/sysv/linux/powerpc/sysdep.h |  7 -------
 3 files changed, 27 deletions(-)

(limited to 'sysdeps/unix')

diff --git a/sysdeps/unix/sysv/linux/dl-vdso-setup.c b/sysdeps/unix/sysv/linux/dl-vdso-setup.c
index 037a2774b6..b42b9dfe32 100644
--- a/sysdeps/unix/sysv/linux/dl-vdso-setup.c
+++ b/sysdeps/unix/sysv/linux/dl-vdso-setup.c
@@ -71,17 +71,6 @@ PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t,
 # ifdef HAVE_GET_TBFREQ
 PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO;
 # endif
-/* The sigtramp are used on powerpc backtrace without using
-   INLINE_VSYSCALL, so there is no need to set their type.  */
-# ifdef HAVE_SIGTRAMP_RT64
-PROCINFO_CLASS void *_dl_vdso_sigtramp_rt64 RELRO;
-# endif
-# ifdef HAVE_SIGTRAMP_RT32
-PROCINFO_CLASS void *_dl_vdso_sigtramp_rt32 RELRO;
-# endif
-# ifdef HAVE_SIGTRAMP_32
-PROCINFO_CLASS void *_dl_vdso_sigtramp_32 RELRO;
-# endif
 #endif
 
 #undef RELRO
diff --git a/sysdeps/unix/sysv/linux/dl-vdso-setup.h b/sysdeps/unix/sysv/linux/dl-vdso-setup.h
index daf9873c4e..75b00a0046 100644
--- a/sysdeps/unix/sysv/linux/dl-vdso-setup.h
+++ b/sysdeps/unix/sysv/linux/dl-vdso-setup.h
@@ -47,15 +47,6 @@ setup_vdso_pointers (void)
 #ifdef HAVE_GET_TBFREQ
   GLRO(dl_vdso_get_tbfreq) = dl_vdso_vsym (HAVE_GET_TBFREQ);
 #endif
-#ifdef HAVE_SIGTRAMP_RT64
-  GLRO(dl_vdso_sigtramp_rt64) = dl_vdso_vsym (HAVE_SIGTRAMP_RT64);
-#endif
-#ifdef HAVE_SIGTRAMP_RT32
-  GLRO(dl_vdso_sigtramp_rt32) = dl_vdso_vsym (HAVE_SIGTRAMP_RT32);
-#endif
-#ifdef HAVE_SIGTRAMP_32
-  GLRO(dl_vdso_sigtramp_32) = dl_vdso_vsym (HAVE_SIGTRAMP_32);
-#endif
 }
 
 #endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
index 4b9d43c636..ff9644d209 100644
--- a/sysdeps/unix/sysv/linux/powerpc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -255,11 +255,4 @@
 #define HAVE_GETTIMEOFDAY_VSYSCALL      "__kernel_gettimeofday"
 #define HAVE_GET_TBFREQ                 "__kernel_get_tbfreq"
 
-#if defined(__PPC64__) || defined(__powerpc64__)
-# define HAVE_SIGTRAMP_RT64		"__kernel_sigtramp_rt64"
-#else
-# define HAVE_SIGTRAMP_32		"__kernel_sigtramp32"
-# define HAVE_SIGTRAMP_RT32		"__kernel_sigtramp_rt32"
-#endif
-
 #endif /* _LINUX_POWERPC_SYSDEP_H  */
-- 
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