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.

1 files changed, 263 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/sh/register-dump.h b/sysdeps/unix/sysv/linux/sh/register-dump.h
new file mode 100644
index 0000000000..3bcc998290
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sh/register-dump.h
@@ -0,0 +1,263 @@
+/* Dump registers.
+   Copyright (C) 1999-2019 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 <sys/uio.h>
+#include <_itoa.h>
+
+/* We will print the register dump in this format:
+
+  R0: XXXXXXXX   R1: XXXXXXXX   R2: XXXXXXXX   R3: XXXXXXXX
+  R4: XXXXXXXX   R5: XXXXXXXX   R6: XXXXXXXX   R7: XXXXXXXX
+  R8: XXXXXXXX   R9: XXXXXXXX  R10: XXXXXXXX  R11: XXXXXXXX
+ R12: XXXXXXXX  R13: XXXXXXXX  R14: XXXXXXXX  R15: XXXXXXXX
+
+MACL: XXXXXXXX MACH: XXXXXXXX
+
+  PC: XXXXXXXX   PR: XXXXXXXX  GBR: XXXXXXXX   SR: XXXXXXXX
+
+ FR0: XXXXXXXX  FR1: XXXXXXXX  FR2: XXXXXXXX  FR3: XXXXXXXX
+ FR4: XXXXXXXX  FR5: XXXXXXXX  FR6: XXXXXXXX  FR7: XXXXXXXX
+ FR8: XXXXXXXX  FR9: XXXXXXXX FR10: XXXXXXXX FR11: XXXXXXXX
+FR12: XXXXXXXX FR13: XXXXXXXX FR14: XXXXXXXX FR15: XXXXXXXX
+
+ XR0: XXXXXXXX  XR1: XXXXXXXX  XR2: XXXXXXXX  XR3: XXXXXXXX
+ XR4: XXXXXXXX  XR5: XXXXXXXX  XR6: XXXXXXXX  XR7: XXXXXXXX
+ XR8: XXXXXXXX  XR9: XXXXXXXX XR10: XXXXXXXX XR11: XXXXXXXX
+XR12: XXXXXXXX XR13: XXXXXXXX XR14: XXXXXXXX XR15: XXXXXXXX
+
+FPSCR: XXXXXXXX FPUL: XXXXXXXX
+
+ */
+
+static void
+hexvalue (unsigned long int value, char *buf, size_t len)
+{
+  char *cp = _itoa_word (value, buf + len, 16, 0);
+  while (cp > buf)
+    *--cp = '0';
+}
+
+static void
+register_dump (int fd, struct ucontext_t *ctx)
+{
+  char regs[22][8];
+  struct iovec iov[22 * 2 + 34 * 2 + 2];
+  size_t nr = 0;
+
+#define ADD_STRING(str) \
+  iov[nr].iov_base = (char *) str;					      \
+  iov[nr].iov_len = strlen (str);					      \
+  ++nr
+#define ADD_MEM(str, len) \
+  iov[nr].iov_base = str;						      \
+  iov[nr].iov_len = len;						      \
+  ++nr
+
+  /* Generate strings of register contents.  */
+  hexvalue (ctx->uc_mcontext.gregs[REG_R0], regs[0], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R1], regs[1], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R2], regs[2], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R3], regs[3], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R4], regs[4], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R5], regs[5], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R6], regs[6], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R7], regs[7], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R8], regs[8], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R9], regs[9], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R10], regs[10], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R11], regs[11], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R12], regs[12], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R13], regs[13], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R14], regs[14], 8);
+  hexvalue (ctx->uc_mcontext.gregs[REG_R15], regs[15], 8);
+  hexvalue (ctx->uc_mcontext.macl, regs[16], 8);
+  hexvalue (ctx->uc_mcontext.mach, regs[17], 8);
+  hexvalue (ctx->uc_mcontext.pc, regs[18], 8);
+  hexvalue (ctx->uc_mcontext.pr, regs[19], 8);
+  hexvalue (ctx->uc_mcontext.gbr, regs[20], 8);
+  hexvalue (ctx->uc_mcontext.sr, regs[21], 8);
+
+  /* Generate the output.  */
+  ADD_STRING ("Register dump:\n\n  R0: ");
+  ADD_MEM (regs[0], 8);
+  ADD_STRING ("   R1: ");
+  ADD_MEM (regs[1], 8);
+  ADD_STRING ("   R2: ");
+  ADD_MEM (regs[2], 8);
+  ADD_STRING ("   R3: ");
+  ADD_MEM (regs[3], 8);
+  ADD_STRING ("\n  R4: ");
+  ADD_MEM (regs[4], 8);
+  ADD_STRING ("   R5: ");
+  ADD_MEM (regs[5], 8);
+  ADD_STRING ("   R6: ");
+  ADD_MEM (regs[6], 8);
+  ADD_STRING ("   R7: ");
+  ADD_MEM (regs[7], 8);
+  ADD_STRING ("\n  R8: ");
+  ADD_MEM (regs[8], 8);
+  ADD_STRING ("   R9: ");
+  ADD_MEM (regs[9], 8);
+  ADD_STRING ("  R10: ");
+  ADD_MEM (regs[10], 8);
+  ADD_STRING ("  R11: ");
+  ADD_MEM (regs[11], 8);
+  ADD_STRING ("\n R12: ");
+  ADD_MEM (regs[12], 8);
+  ADD_STRING ("  R13: ");
+  ADD_MEM (regs[13], 8);
+  ADD_STRING ("  R14: ");
+  ADD_MEM (regs[14], 8);
+  ADD_STRING ("  R15: ");
+  ADD_MEM (regs[15], 8);
+
+  ADD_STRING ("\n\nMACL: ");
+  ADD_MEM (regs[16], 8);
+  ADD_STRING (" MACH: ");
+  ADD_MEM (regs[17], 8);
+
+  ADD_STRING ("\n\n  PC: ");
+  ADD_MEM (regs[18], 8);
+  ADD_STRING ("   PR: ");
+  ADD_MEM (regs[19], 8);
+  ADD_STRING ("  GBR: ");
+  ADD_MEM (regs[20], 8);
+  ADD_STRING ("   SR: ");
+  ADD_MEM (regs[21], 8);
+
+  ADD_STRING ("\n");
+
+#ifdef __SH_FPU_ANY__
+  char fpregs[34][8];
+  if (ctx->uc_mcontext.ownedfp != 0)
+    {
+      hexvalue (ctx->uc_mcontext.fpregs[0], fpregs[0], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[1], fpregs[1], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[2], fpregs[2], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[3], fpregs[3], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[4], fpregs[4], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[5], fpregs[5], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[6], fpregs[6], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[7], fpregs[7], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[8], fpregs[8], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[9], fpregs[9], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[10], fpregs[10], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[11], fpregs[11], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[12], fpregs[12], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[13], fpregs[13], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[14], fpregs[14], 8);
+      hexvalue (ctx->uc_mcontext.fpregs[15], fpregs[15], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[0], fpregs[16], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[1], fpregs[17], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[2], fpregs[18], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[3], fpregs[19], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[4], fpregs[20], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[5], fpregs[21], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[6], fpregs[22], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[7], fpregs[23], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[8], fpregs[24], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[9], fpregs[25], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[10], fpregs[26], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[11], fpregs[27], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[12], fpregs[28], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[13], fpregs[29], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[14], fpregs[30], 8);
+      hexvalue (ctx->uc_mcontext.xfpregs[15], fpregs[31], 8);
+      hexvalue (ctx->uc_mcontext.fpscr, fpregs[32], 8);
+      hexvalue (ctx->uc_mcontext.fpul, fpregs[33], 8);
+
+      ADD_STRING ("\n\n FR0: ");
+      ADD_MEM (fpregs[0], 8);
+      ADD_STRING ("  FR1: ");
+      ADD_MEM (fpregs[1], 8);
+      ADD_STRING ("  FR2: ");
+      ADD_MEM (fpregs[2], 8);
+      ADD_STRING ("  FR3: ");
+      ADD_MEM (fpregs[3], 8);
+      ADD_STRING ("\n FR4: ");
+      ADD_MEM (fpregs[4], 8);
+      ADD_STRING ("  FR5: ");
+      ADD_MEM (fpregs[5], 8);
+      ADD_STRING ("  FR6: ");
+      ADD_MEM (fpregs[6], 8);
+      ADD_STRING ("  FR7: ");
+      ADD_MEM (fpregs[7], 8);
+      ADD_STRING ("\n FR8: ");
+      ADD_MEM (fpregs[8], 8);
+      ADD_STRING ("  FR9: ");
+      ADD_MEM (fpregs[9], 8);
+      ADD_STRING (" FR10: ");
+      ADD_MEM (fpregs[10], 8);
+      ADD_STRING (" FR11: ");
+      ADD_MEM (fpregs[11], 8);
+      ADD_STRING ("\nFR12: ");
+      ADD_MEM (fpregs[12], 8);
+      ADD_STRING (" FR13: ");
+      ADD_MEM (fpregs[13], 8);
+      ADD_STRING (" FR14: ");
+      ADD_MEM (fpregs[14], 8);
+      ADD_STRING (" FR15: ");
+      ADD_MEM (fpregs[15], 8);
+      ADD_STRING ("\n\n XR0: ");
+      ADD_MEM (fpregs[16], 8);
+      ADD_STRING ("  XR1: ");
+      ADD_MEM (fpregs[17], 8);
+      ADD_STRING ("  XR2: ");
+      ADD_MEM (fpregs[18], 8);
+      ADD_STRING ("  XR3: ");
+      ADD_MEM (fpregs[19], 8);
+      ADD_STRING ("\n XR4: ");
+      ADD_MEM (fpregs[20], 8);
+      ADD_STRING ("  XR5: ");
+      ADD_MEM (fpregs[21], 8);
+      ADD_STRING ("  XR6: ");
+      ADD_MEM (fpregs[22], 8);
+      ADD_STRING ("  XR7: ");
+      ADD_MEM (fpregs[23], 8);
+      ADD_STRING ("\n XR8: ");
+      ADD_MEM (fpregs[24], 8);
+      ADD_STRING ("  XR9: ");
+      ADD_MEM (fpregs[25], 8);
+      ADD_STRING (" XR10: ");
+      ADD_MEM (fpregs[26], 8);
+      ADD_STRING (" XR11: ");
+      ADD_MEM (fpregs[27], 8);
+      ADD_STRING ("\nXR12: ");
+      ADD_MEM (fpregs[28], 8);
+      ADD_STRING (" XR13: ");
+      ADD_MEM (fpregs[29], 8);
+      ADD_STRING (" XR14: ");
+      ADD_MEM (fpregs[30], 8);
+      ADD_STRING (" XR15: ");
+      ADD_MEM (fpregs[31], 8);
+
+      ADD_STRING ("\n\nFPSCR: ");
+      ADD_MEM (fpregs[32], 8);
+      ADD_STRING (" FPUL: ");
+      ADD_MEM (fpregs[33], 8);
+
+      ADD_STRING ("\n");
+    }
+#endif /* __SH_FPU_ANY__  */
+
+  /* Write the stuff out.  */
+  writev (fd, iov, nr);
+}
+
+
+#define REGISTER_DUMP register_dump (fd, ctx)