Refactor sigcontextinfo.h

This patch refactor sigcontextinfo.h header to use SA_SIGINFO as default
for both gmon and debug implementations.  This allows simplify
profil-counter.h on Linux to use a single implementation and remove the
requirements for newer ports to redefine __sigaction/sigaction to use
SA_SIGINFO.

The GET_PC macro is also replaced with a function sigcontext_get_pc that
returns an uintptr_t instead of a void pointer.  It allows easier convertion
to integer on ILP32 architecture, such as x32, without the need to suppress
compiler warnings.

The patch also requires some refactor of register-dump.h file for some
architectures (to reflect it is now called from a sa_sigaction instead of
sa_handler signal context).

   - Alpha, i386, and s390 are straighfoward to take in consideration the
     new argument type.

   - ia64 takes in consideration the kernel pass a struct sigcontextt
     as third argument for sa_sigaction.

   - sparc take in consideration the kernel pass a pt_regs struct
     as third argument for sa_sigaction.

   - m68k dummy function is removed and the FP state is dumped on
     register_dump itself.

   - For SH the register-dump.h file is consolidate on a common implementation
     and the floating-point state is checked based on ownedfp field.

The register_dump does not change its output format in any affected
architecture.

I checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
arm-linux-gnueabihf, sparcv9-linux-gnu, sparc64-linux-gnu, powerpc-linux-gnu,
powerpc64-linux-gnu, and powerpc64le-linux-gnu.

I also checked the libSegFault.so through catchsegv on alpha-linux-gnu,
m68k-linux-gnu and sh4-linux-gnu to confirm the output has not changed.

	Adhemerval Zanella  <adhemerval.zanella@linaro.org>
	Florian Weimer  <fweimer@redhat.com>

	* debug/segfault.c (install_handler): Use SA_SIGINFO if defined.
	* sysdeps/generic/profil-counter.h (__profil_counter): Cast to
	uintptr_t.
	* sysdeps/generic/sigcontextinfo.h (GET_PC): Rename to
	sigcontext_get_pc and return aligned cast to uintptr_t.
	* sysdeps/mach/hurd/i386/sigcontextinfo.h (GET_PC): Likewise.
	* sysdeps/posix/profil.c (profil_count): Change PC argument to
	uintptr_t.
	(__profil): Use SA_SIGINFO.
	* sysdeps/posix/sprofil.c (profil_count): Change PCP argument to
	uintptr_t.
	(__sprofil): Use SA_SIGINFO.
	* sysdeps/unix/sysv/linux/profil-counter.h: New file.
	* sysdeps/unix/sysv/linux/aarch64/profil-counter.h: Remove file.
	* sysdeps/unix/sysv/linux/csky/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/nios2/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/riscv/profil-counter.h: Likewise.
	* sysdeps/sysv/linux/s390/s390-32/profil-counter.h: Likewise.
	* sysdeps/sysv/linux/s390/s390-64/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/arm/profil-counter.h (__profil_counter):
	Assume SA_SIGINFO and use sigcontext_get_pc instead of GET_PC.
	* sysdeps/unix/sysv/linux/sparc/profil-counter.h: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/profil-counter.h: Remove file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/profil-counter.h: Likewise.
	* sysdpes/unix/sysv/linux/aarch64/sigcontextinfo.h (SIGCONTEXT,
	GET_PC, __sigaction, sigaction): Remove defines.
	(sigcontext_get_pc): New function.
	* sysdeps/unix/sysv/linux/alpha/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/arm/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/m68k/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/nios2/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/sigcontextinfo.h: Likewise.
	* sysdeps/sysv/linux/sparc/sparc32/sigcontextinfo.h: Likewise.
	* sysdeps/sysv/linux/sparc/sparc64/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/alpha/register-dump.h (register_dump):
	Handle CTX argument as ucontext_t.
	* sysdeps/unix/sysv/linux/i386/register-dump.h: Likewise.
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/register-dump.h: Likewise.
	* sysdeps/sysv/linux/s390/s390-32/register-dump.h: Likewise.
	* sysdeps/sysv/linux/s390/s390-64/register-dump.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/register-dump.h: New file.
	* sysdeps/unix/sysv/linux/sh/sh4/register-dump.h: Remove File.
	* sysdeps/unix/sysv/linux/sh/sh3/register-dump.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/register-dump.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/register-dump.h: Likewise.
	* sysdeps/unix/sysv/linux/Makefile (tests-internal): Add
	tst-sigcontextinfo-get_pc.
	* sysdeps/unix/sysv/linux/tst-sigcontextinfo-get_pc.c: New file.
	(CFLAGS-tst-sigcontextinfo-get_pc.c): New rule.

2 files changed, 19 insertions, 45 deletions

diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/profil-counter.h b/sysdeps/unix/sysv/linux/s390/s390-64/profil-counter.h
deleted file mode 100644
index 41301afe9c..0000000000
--- a/sysdeps/unix/sysv/linux/s390/s390-64/profil-counter.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* Low-level statistical profiling support function.  Linux/s390 version.
-   Copyright (C) 2000-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <signal.h>
-#include <sigcontextinfo.h>
-
-static void
-__profil_counter (int signo, SIGCONTEXT scp)
-{
-  profil_count ((void *) GET_PC (scp));
-}
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/register-dump.h b/sysdeps/unix/sysv/linux/s390/s390-64/register-dump.h
index f3af16b223..a00516746a 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/register-dump.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/register-dump.h
@@ -48,7 +48,7 @@ hexvalue (unsigned long int value, char *buf, size_t len)
 }
 
 static void
-register_dump (int fd, struct sigcontext *ctx)
+register_dump (int fd, struct ucontext_t *ctx)
 {
   char regs[19][16];
   struct iovec iov[40];
@@ -64,24 +64,24 @@ register_dump (int fd, struct sigcontext *ctx)
   ++nr
 
   /* Generate strings of register contents.  */
-  hexvalue (ctx->sregs->regs.gprs[0], regs[0], 16);
-  hexvalue (ctx->sregs->regs.gprs[1], regs[1], 16);
-  hexvalue (ctx->sregs->regs.gprs[2], regs[2], 16);
-  hexvalue (ctx->sregs->regs.gprs[3], regs[3], 16);
-  hexvalue (ctx->sregs->regs.gprs[4], regs[4], 16);
-  hexvalue (ctx->sregs->regs.gprs[5], regs[5], 16);
-  hexvalue (ctx->sregs->regs.gprs[6], regs[6], 16);
-  hexvalue (ctx->sregs->regs.gprs[7], regs[7], 16);
-  hexvalue (ctx->sregs->regs.gprs[8], regs[8], 16);
-  hexvalue (ctx->sregs->regs.gprs[9], regs[9], 16);
-  hexvalue (ctx->sregs->regs.gprs[10], regs[10], 16);
-  hexvalue (ctx->sregs->regs.gprs[11], regs[11], 16);
-  hexvalue (ctx->sregs->regs.gprs[12], regs[12], 16);
-  hexvalue (ctx->sregs->regs.gprs[13], regs[13], 16);
-  hexvalue (ctx->sregs->regs.gprs[14], regs[14], 16);
-  hexvalue (ctx->sregs->regs.gprs[15], regs[15], 16);
-  hexvalue (ctx->sregs->regs.psw.mask, regs[16], 16);
-  hexvalue (ctx->sregs->regs.psw.addr, regs[17], 16);
+  hexvalue (ctx->uc_mcontext.gregs[0], regs[0], 16);
+  hexvalue (ctx->uc_mcontext.gregs[1], regs[1], 16);
+  hexvalue (ctx->uc_mcontext.gregs[2], regs[2], 16);
+  hexvalue (ctx->uc_mcontext.gregs[3], regs[3], 16);
+  hexvalue (ctx->uc_mcontext.gregs[4], regs[4], 16);
+  hexvalue (ctx->uc_mcontext.gregs[5], regs[5], 16);
+  hexvalue (ctx->uc_mcontext.gregs[6], regs[6], 16);
+  hexvalue (ctx->uc_mcontext.gregs[7], regs[7], 16);
+  hexvalue (ctx->uc_mcontext.gregs[8], regs[8], 16);
+  hexvalue (ctx->uc_mcontext.gregs[9], regs[9], 16);
+  hexvalue (ctx->uc_mcontext.gregs[10], regs[10], 16);
+  hexvalue (ctx->uc_mcontext.gregs[11], regs[11], 16);
+  hexvalue (ctx->uc_mcontext.gregs[12], regs[12], 16);
+  hexvalue (ctx->uc_mcontext.gregs[13], regs[13], 16);
+  hexvalue (ctx->uc_mcontext.gregs[14], regs[14], 16);
+  hexvalue (ctx->uc_mcontext.gregs[15], regs[15], 16);
+  hexvalue (ctx->uc_mcontext.psw.mask, regs[16], 16);
+  hexvalue (ctx->uc_mcontext.psw.addr, regs[17], 16);
 
   /* Generate the output.  */
   ADD_STRING ("Register dump:\n\n GPR0: ");