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powerpc: Remove backtrace implementation

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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
This commit is contained in:
Adhemerval Zanella
2021-02-12 19:20:27 +03:00
parent 2c6cabb3a4
commit 82fd7314c7
5 changed files with 0 additions and 277 deletions
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11
sysdeps/unix/sysv/linux/dl-vdso-setup.c
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@@ -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