Unify some sys/procfs.h headers.

As per recent discussions, this patch unifies some of the sys/procfs.h
headers for architectures using the Linux kernel, producing a generic
version that can hopefully be used by all new architectures as well.

The new generic version is based on the AArch64 one.  The register
definitions, the only part that generally needs to vary by
architecture, go in a new bits/procfs.h header (which each
architecture using the generic version needs to provide); that header
also has any #includes that were in the architecture-specific
sys/procfs.h, where those includes went beyond the generic set.

The generic version is used for eight architectures where the generic
definitions were the same as the architecture-specific ones.  (Some of
those architectures had #if 0 fields, now removed; some defined types
or fields using different type names which were typedefs for the same
underlying types.)

Six of the remaining architectures with their own sys/procfs.h use
unsigned short for pr_uid / pr_gid in some cases; moving those to the
generic header will require a bits/ header to define a typedef for the
type of those fields.  In the case of alpha, the generic sys/procfs.h
uses elf_gregset_t (= unsigned long int[33]) to define prgregset_t and
elf_fpregset_t (= double[32]) to define prfpregset_t, but the alpha
version uses gregset_t (= long int[33]) and fpregset_t (= long
int[32]), so avoiding unnecessarily changing the underlying types (and
thus C++ name mangling) again means a bits/ header will need to be
able to define a different choice for those typedefs.

bits/procfs.h is included outside the __BEGIN_DECLS / __END_DECLS pair
(whereas the definitions it contains were previously inside that pair
in various sys/procfs.h headers), because it sometimes includes other
headers and putting those other #includes inside that pair seems
risky.  Because none of the declarations in bits/procfs.h are of
functions or variables or involve function types, I don't think it
makes any difference whether they are inside or outside an extern "C"
context.

Tested with build-many-glibcs.py (again, that does not provide much
validation for the correctness of this patch).

	* sysdeps/unix/sysv/linux/sys/procfs.h: Replace with file based on
	AArch64 version.  Include <bits/procfs.h>.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir) = misc]
	(sysdep_headers): Add bits/procfs.h.
	* sysdeps/unix/sysv/linux/bits/procfs.h: New file.
	* sysdeps/unix/sysv/linux/aarch64/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/nios2/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/riscv/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sys/procfs.h: Remove file.
	* sysdeps/unix/sysv/linux/hppa/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sys/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/riscv/sys/procfs.h: Likewise.

1 files changed, 29 insertions, 27 deletions

diff --git a/sysdeps/unix/sysv/linux/sys/procfs.h b/sysdeps/unix/sysv/linux/sys/procfs.h
index 6af44c02ca..759570c595 100644
--- a/sysdeps/unix/sysv/linux/sys/procfs.h
+++ b/sysdeps/unix/sysv/linux/sys/procfs.h
@@ -1,4 +1,6 @@
-/* Copyright (C) 1996-2018 Free Software Foundation, Inc.
+/* Definitions for core files and libthread_db.  Generic Linux version.
+   Copyright (C) 1996-2018 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
@@ -18,20 +20,28 @@
 #ifndef _SYS_PROCFS_H
 #define _SYS_PROCFS_H	1
 
-/* This is somehow modelled after the file of the same name on SysVr4
+/* This is somewhat modelled after the file of the same name on SVR4
    systems.  It provides a definition of the core file format for ELF
-   used on Linux.  */
+   used on Linux.  It doesn't have anything to do with the /proc file
+   system, even though Linux has one.
+
+   Anyway, the whole purpose of this file is for GDB and GDB only.
+   Don't read too much into it.  Don't use it for anything other than
+   GDB unless you know what you are doing.  */
 
 #include <features.h>
-#include <signal.h>
 #include <sys/time.h>
 #include <sys/types.h>
-#include <sys/ucontext.h>
 #include <sys/user.h>
-#include <asm/elf.h>
+
+/* bits/procfs.h, provided by each architecture, must define
+   elf_gregset_t, elf_fpregset_t and any other architecture-specific
+   types needed.  */
+#include <bits/procfs.h>
 
 __BEGIN_DECLS
 
+/* Signal info.  */
 struct elf_siginfo
   {
     int si_signo;			/* Signal number.  */
@@ -41,26 +51,17 @@ struct elf_siginfo
 
 /* Definitions to generate Intel SVR4-like core files.  These mostly
    have the same names as the SVR4 types with "elf_" tacked on the
-   front to prevent clashes with linux definitions, and the typedef
+   front to prevent clashes with Linux definitions, and the typedef
    forms have been avoided.  This is mostly like the SVR4 structure,
    but more Linuxy, with things that Linux does not support and which
-   gdb doesn't really use excluded.  Fields present but not used are
-   marked with "XXX".  */
+   GDB doesn't really use excluded.  */
+
 struct elf_prstatus
   {
-#if 0
-    long int pr_flags;			/* XXX Process flags.  */
-    short int pr_why;			/* XXX Reason for process halt.  */
-    short int pr_what;			/* XXX More detailed reason.  */
-#endif
     struct elf_siginfo pr_info;		/* Info associated with signal.  */
     short int pr_cursig;		/* Current signal.  */
     unsigned long int pr_sigpend;	/* Set of pending signals.  */
     unsigned long int pr_sighold;	/* Set of held signals.  */
-#if 0
-    stack_t pr_altstack;		/* Alternate stack info.  */
-    struct sigaction pr_action;		/* Signal action for current sig.  */
-#endif
     __pid_t pr_pid;
     __pid_t pr_ppid;
     __pid_t pr_pgrp;
@@ -69,15 +70,12 @@ struct elf_prstatus
     struct timeval pr_stime;		/* System time.  */
     struct timeval pr_cutime;		/* Cumulative user time.  */
     struct timeval pr_cstime;		/* Cumulative system time.  */
-#if 0
-    long int pr_instr;			/* Current instruction.  */
-#endif
     elf_gregset_t pr_reg;		/* GP registers.  */
     int pr_fpvalid;			/* True if math copro being used.  */
   };
 
 
-#define ELF_PRARGSZ     (80)    /* Number of chars for args */
+#define ELF_PRARGSZ     (80)    /* Number of chars for args.  */
 
 struct elf_prpsinfo
   {
@@ -94,21 +92,25 @@ struct elf_prpsinfo
     char pr_psargs[ELF_PRARGSZ];	/* Initial part of arg list.  */
   };
 
+/* The rest of this file provides the types for emulation of the
+   Solaris <proc_service.h> interfaces that should be implemented by
+   users of libthread_db.  */
+
 /* Addresses.  */
 typedef void *psaddr_t;
 
 /* Register sets.  Linux has different names.  */
-typedef gregset_t prgregset_t;
-typedef fpregset_t prfpregset_t;
+typedef elf_gregset_t prgregset_t;
+typedef elf_fpregset_t prfpregset_t;
 
 /* We don't have any differences between processes and threads,
-   therefore habe only ine PID type.  */
+   therefore have only one PID type.  */
 typedef __pid_t lwpid_t;
 
-
+/* Process status and info.  In the end we do provide typedefs for them.  */
 typedef struct elf_prstatus prstatus_t;
 typedef struct elf_prpsinfo prpsinfo_t;
 
 __END_DECLS
 
-#endif	/* sys/procfs.h */
+#endif	/* sys/procfs.h.  */