Update. cvs/libc-ud-970926

1997-09-27 01:14  Ulrich Drepper  <drepper@cygnus.com>

	* Makeconfig (extra-objs): Depend in before-compile.

	* configure.in: Locate Perl and substitute with complete path.
	* config.make.in: Add PERL for substitution.
	* elf/Makefile (routines): Add dl-addr.
	* elf/dladdr.c: Move the real code into ...
	* elf/dl-addr.c: New file.
	* elf/link.h: Add prototype for _dl_addr.

	* elf/dladdr.c (dladdr): Change address argument to be const.
	* elf/dlfcn.h: Likewise.

	* locale/C_name.c: Add _nl_POSIX_name.
	* locale/localeinfo.h: Add declaration of _nl_POSIX_name.
	* locale/findlocale.c (_nl_find_locale): Use _nl_POSIX_name.
	(_nl_remove_locale): Free name of data set.
	* locale/setlocale.c (clever_copy): Remove.
	(new_composite_name): Use _nl_C_name and _nl_POSIX_name in compare.
	(setname): Only remove old name when it is for category LC_ALL.

	Change malloc, free, realloc, and memalign hooks for glibc to take
	another parameter indicating the location of the caller.
	* malloc/malloc.c: Change hook functions and variables.
	* malloc/malloc.h: Likewise.
	* malloc/mcheck.c: Likewise.  Make sure later hooked function also
	get the original caller address.
	* malloc/mtrace.c: Likewise.
	(tr_where): If no information in _mtrace_file is given use the
	information about the caller.
	* malloc/Makefile (distribute): Replace mtrace.awk by mtrace.pl.
	Add rules to install mtrace.pl after rewriting.
	* malloc/mtrace.pl: New file.  Based on the old AWK script but
	with extended functionality.
	* malloc/mtrace.awk: Removed.

	* po/fr.po: New version.

	* string/Makefile: Do use builtins for tester.c and inl-tester.c.
	* string/tester.c: Rewrite.  Split in many small functions to not
	exceed gcc's limits.

	* sysdeps/unix/sysv/linux/syscalls.list: Add prctl.

1997-09-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* string/bits/string2.h (__stpcpy_small): Don't use casts as
	lvalues.

1997-09-26  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* manual/time.texi (Formatting Date and Time): Clarify
	explanation of strftime flags a bit.
	Suggested by Robert Bihlmeyer <robbe@orcus.priv.at>.

1997-09-25 00:13  David S. Miller  <davem@tanya.rutgers.edu>

	* sysdeps/libm-ieee754/s_exp2f.c: Protect _GNU_SOURCE definition.
	Fix typo, it is FLT_MANT_DIG.

1997-09-24 18:52  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* math/atest-exp2.c: Include <stdlib/gmp.h> instead of <gmp.h>.

1997-08-27 08:10  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* libio/libio.h, libio/libioP.h: Support libio in libstdc++.

	* libio/libio.h (_IO_peekc): Defined as _IO_peekc_unlocked if
	_IO_MTSAFE_IO is undefined.

1997-09-24 23:27  Richard Henderson  <rth@cygnus.com>

	* elf/dl-runtime.c (fixup): Don't go through elf_machine_relplt, but
	lookup the value of the target symbol ourselves and call the new
	elf_machine_fixup_plt.  This kills the ELF_FIXUP_RETURN_VALUE hack.
	(profile_fixup): Likewise, but don't fix up the plt.
	* elf/rtld.c (_dl_main): ELF_MACHINE_RELOC_NOPLT renamed _JMP_SLOT.
	* sysdeps/alpha/dl-machine.h (ELF_MACHINE_RELOC_NOPLT): Renamed.
	(elf_alpha_fix_plt): Renamed elf_machine_fixup_plt.
	* sysdeps/i386/dl-machine.h (elf_machine_relplt): Killed.
	(ELF_MACHINE_JMP_SLOT): Renamed.
	(elf_machine_fixup_plt): New function.
	* sysdeps/m68k/dl-machine.h: Likewise.
	* sysdeps/powerpc/dl-machine.h: Likewise.
	(elf_machine_rela): Moved JMP_SLOT fixup out to elf_machine_fixup_plt.
	* sysdeps/sparc/sparc32/dl-machine.h: Likewise.
	* sysdeps/sparc/sparc64/dl-machine.h: Likewise.
	* sysdeps/stub/dl-machine.h: Update, sorta.

	* sysdeps/alpha/dl-machine.h (elf_machine_runtime_setup): Do profiling.
	(TRAMPOLINE_TEMPLATE): From the carcas of _RUNTIME_TRAMPOLINE, do
	both normal and profile code.
	(elf_machine_rela): Handle r_addend for .got and .plt too.

9 files changed, 194 insertions, 163 deletions

diff --git a/sysdeps/alpha/dl-machine.h b/sysdeps/alpha/dl-machine.h
index e0ba67b48b..d3eb242c04 100644
--- a/sysdeps/alpha/dl-machine.h
+++ b/sysdeps/alpha/dl-machine.h
@@ -91,6 +91,7 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 {
   Elf64_Addr plt;
   extern void _dl_runtime_resolve (void);
+  extern void _dl_runtime_profile (void);
 
   if (l->l_info[DT_JMPREL] && lazy)
     {
@@ -100,7 +101,14 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
       plt = l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr;
 
       /* This function will be called to perform the relocation.  */
-      *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_resolve;
+      if (!profile)
+        *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_resolve;
+      else
+	{
+	  *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_profile;
+	  /* Say that we really want profiling and the timers are started.  */
+	  _dl_profile_map = l;
+	}
 
       /* Identify this shared object */
       *(Elf64_Addr *)(plt + 24) = (Elf64_Addr) l;
@@ -115,11 +123,10 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 
 /* This code is used in dl-runtime.c to call the `fixup' function
    and then redirect to the address it returns.  */
-#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ( \
-"/* Trampoline for _dl_runtime_resolver */
-	.globl _dl_runtime_resolve
-	.ent _dl_runtime_resolve
-_dl_runtime_resolve:
+#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name, IMB) asm ( "\
+	.globl " #tramp_name "
+	.ent " #tramp_name "
+" #tramp_name ":
 	lda	$sp, -168($sp)
 	.frame	$sp, 168, $26
 	/* Preserve all registers that C normally doesn't.  */
@@ -146,18 +153,20 @@ _dl_runtime_resolve:
 	stq	$29, 160($sp)
 	.mask	0x27ff01ff, -168
 	/* Set up our $gp */
-	br	$gp, 0f
-0:	ldgp	$gp, 0($gp)
+	br	$gp, .+4
+	ldgp	$gp, 0($gp)
 	.prologue 1
-	/* Set up the arguments for _dl_runtime_resolve. */
+	/* Set up the arguments for fixup: */
 	/* $16 = link_map out of plt0 */
 	/* $17 = offset of reloc entry = ($28 - $27 - 20) /12 * 24 */
+	/* $18 = return address */
 	subq	$28, $27, $17
 	ldq	$16, 8($27)
 	subq	$17, 20, $17
+	mov	$26, $18
 	addq	$17, $17, $17
 	/* Do the fixup */
-	bsr	$26, fixup..ng
+	bsr	$26, " #fixup_name "..ng
 	/* Move the destination address into position.  */
 	mov	$0, $27
 	/* Restore program registers.  */
@@ -183,14 +192,21 @@ _dl_runtime_resolve:
 	ldq	$25, 152($sp)
 	ldq	$29, 160($sp)
 	/* Flush the Icache after having modified the .plt code.  */
-	imb
+	" #IMB "
 	/* Clean up and turn control to the destination */
 	lda	$sp, 168($sp)
 	jmp	$31, ($27)
-	.end _dl_runtime_resolve");
+	.end " #tramp_name)
 
-/* The PLT uses Elf64_Rela relocs.  */
-#define elf_machine_relplt elf_machine_rela
+#ifndef PROF
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE 				\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup, imb);	\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup, #nop);
+#else
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE				\
+  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup);		\
+  strong_alias (_dl_runtime_resolve, _dl_runtime_profile);
+#endif
 
 /* Initial entry point code for the dynamic linker.
    The C function `_dl_start' is the real entry point;
@@ -255,37 +271,31 @@ _dl_start_user:
 #define elf_machine_lookup_noexec_p(type)  (0)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	 R_ALPHA_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	 R_ALPHA_JMP_SLOT
 
 /* The alpha never uses Elf64_Rel relocations.  */
 #define ELF_MACHINE_NO_REL 1
 
-#endif /* !dl_machine_h */
-
-#ifdef RESOLVE
-
 /* Fix up the instructions of a PLT entry to invoke the function
    rather than the dynamic linker.  */
 static inline void
-elf_alpha_fix_plt(struct link_map *l,
-		  const Elf64_Rela *reloc,
-		  Elf64_Addr got_addr,
-		  Elf64_Addr value)
+elf_machine_fixup_plt(struct link_map *l, const Elf64_Rela *reloc,
+		      Elf64_Addr *got_addr, Elf64_Addr value)
 {
   const Elf64_Rela *rela_plt;
   Elf64_Word *plte;
   long edisp;
 
+  /* Store the value we are going to load.  */
+  *got_addr = value;
+
   /* Recover the PLT entry address by calculating reloc's index into the
      .rela.plt, and finding that entry in the .plt.  */
-
   rela_plt = (void *)(l->l_addr + l->l_info[DT_JMPREL]->d_un.d_ptr);
-
   plte = (void *)(l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr + 32);
   plte += 3 * (reloc - rela_plt);
 
   /* Find the displacement from the plt entry to the function.  */
-
   edisp = (long)(value - (Elf64_Addr)&plte[3]) / 4;
 
   if (edisp >= -0x100000 && edisp < 0x100000)
@@ -299,7 +309,7 @@ elf_alpha_fix_plt(struct link_map *l,
       lo = (short)hi;
       hi = (hi - lo) >> 16;
 
-      /* Emit "lda $27,L($27)" */
+      /* Emit "lda $27,lo($27)" */
       plte[1] = 0x237b0000 | (lo & 0xffff);
 
       /* Emit "br $31,function" */
@@ -309,7 +319,7 @@ elf_alpha_fix_plt(struct link_map *l,
 	 committed to memory before the first is overwritten.  */
       __asm__ __volatile__("wmb" : : : "memory");
 
-      /* Emit "ldah $27,H($27)" */
+      /* Emit "ldah $27,hi($27)" */
       plte[0] = 0x277b0000 | (hi & 0xffff);
     }
   else
@@ -319,11 +329,11 @@ elf_alpha_fix_plt(struct link_map *l,
 	 into the cache.  */
 
       int hi, lo;
-      hi = got_addr - (Elf64_Addr)&plte[0];
+      hi = (Elf64_Addr)got_addr - (Elf64_Addr)&plte[0];
       lo = (short)hi;
       hi = (hi - lo) >> 16;
 
-      /* Emit "ldq $27,L($27)" */
+      /* Emit "ldq $27,lo($27)" */
       plte[1] = 0xa77b0000 | (lo & 0xffff);
 
       /* Emit "jmp $31,($27)" */
@@ -333,7 +343,7 @@ elf_alpha_fix_plt(struct link_map *l,
 	 committed to memory before the first is overwritten.  */
       __asm__ __volatile__("wmb" : : : "memory");
 
-      /* Emit "ldah $27,H($27)" */
+      /* Emit "ldah $27,hi($27)" */
       plte[0] = 0x277b0000 | (hi & 0xffff);
     }
 
@@ -343,6 +353,10 @@ elf_alpha_fix_plt(struct link_map *l,
      hasn't made it into Icache yet, so there's nothing to clean up.  */
 }
 
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE
+
 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
    MAP is the object containing the reloc.  */
 static inline void
@@ -382,14 +396,12 @@ elf_machine_rela (struct link_map *map,
 
       loadbase = RESOLVE (&sym, version, r_type);
       sym_value = sym ? loadbase + sym->st_value : 0;
+      sym_value += reloc->r_addend;
 
       if (r_type == R_ALPHA_GLOB_DAT)
 	*reloc_addr = sym_value;
       else if (r_type == R_ALPHA_JMP_SLOT)
-	{
-	  *reloc_addr = sym_value;
-	  elf_alpha_fix_plt (map, reloc, (Elf64_Addr) reloc_addr, sym_value);
-	}
+	elf_machine_fixup_plt (map, reloc, reloc_addr, sym_value);
       else if (r_type == R_ALPHA_REFQUAD)
 	{
 	  sym_value += *reloc_addr;
@@ -405,10 +417,9 @@ elf_machine_rela (struct link_map *map,
 		= (void *)(map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr);
 	      sym_value -= map->l_addr;
 	      sym_value -= dlsymtab[ELF64_R_SYM(reloc->r_info)].st_value;
+	      sym_value -= reloc->r_addend;
 	    }
-	  else
 #endif
-	    sym_value += reloc->r_addend;
 	  *reloc_addr = sym_value;
 	}
       else
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index 041643ef5a..0ac67c05d9 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -185,15 +185,11 @@ _dl_runtime_profile:
 	.previous
 ");
 #endif
-/* The PLT uses Elf32_Rel relocs.  */
-#define elf_machine_relplt elf_machine_rel
 
 /* Mask identifying addresses reserved for the user program,
    where the dynamic linker should not map anything.  */
 #define ELF_MACHINE_USER_ADDRESS_MASK	0xf8000000UL
 
-
-
 /* Initial entry point code for the dynamic linker.
    The C function `_dl_start' is the real entry point;
    its return value is the user program's entry point.  */
@@ -265,7 +261,7 @@ _dl_start_user:\n\
 #define elf_machine_lookup_noplt_p(type) ((type) == R_386_JMP_SLOT)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	R_386_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	R_386_JMP_SLOT
 
 /* The i386 never uses Elf32_Rela relocations.  */
 #define ELF_MACHINE_NO_RELA 1
@@ -287,6 +283,13 @@ dl_platform_init (void)
     _dl_platform = NULL;
 }
 
+static inline void
+elf_machine_fixup_plt (struct link_map *map, const Elf32_Rel *reloc,
+		       Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+  *reloc_addr = value;
+}
+
 #endif /* !dl_machine_h */
 
 #ifdef RESOLVE
diff --git a/sysdeps/libm-ieee754/s_exp2f.c b/sysdeps/libm-ieee754/s_exp2f.c
index e50ac77792..92c1f16c5a 100644
--- a/sysdeps/libm-ieee754/s_exp2f.c
+++ b/sysdeps/libm-ieee754/s_exp2f.c
@@ -25,7 +25,9 @@
    It has been slightly modified to compute 2^x instead of e^x, and for
    single-precision.
    */
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include <float.h>
 #include <ieee754.h>
 #include <math.h>
@@ -116,7 +118,7 @@ __ieee754_exp2f (float x)
   else if (isgreaterequal (x, (float) FLT_MAX_EXP))
     return huge * huge;
   /* And underflow (including -inf).  */
-  else if (isless (x, (float) (FLT_MIN_EXP - FLT_MANT_DIF)))
+  else if (isless (x, (float) (FLT_MIN_EXP - FLT_MANT_DIG)))
     return TWOM100 * TWOM100;
   /* Maybe the result needs to be a denormalised number...  */
   else if (!isnan (x))
diff --git a/sysdeps/m68k/dl-machine.h b/sysdeps/m68k/dl-machine.h
index 44eefb20f5..cc0fb56189 100644
--- a/sysdeps/m68k/dl-machine.h
+++ b/sysdeps/m68k/dl-machine.h
@@ -135,8 +135,6 @@ asm (TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup) \
      ".set _dl_runtime_profile, _dl_runtime_resolve");
 #endif
 #define ELF_MACHINE_RUNTIME_FIXUP_ARGS long int save_a0, long int save_a1
-/* The PLT uses Elf32_Rela relocs.  */
-#define elf_machine_relplt elf_machine_rela
 
 
 /* Mask identifying addresses reserved for the user program,
@@ -216,11 +214,18 @@ _dl_start_user:
 #define elf_machine_lookup_noplt_p(type) ((type) == R_68K_JMP_SLOT)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	R_68K_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	R_68K_JMP_SLOT
 
 /* The m68k never uses Elf32_Rel relocations.  */
 #define ELF_MACHINE_NO_REL 1
 
+static inline void
+elf_machine_fixup_plt (struct link_map *map, const Elf32_Rela *reloc,
+		       Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+  *reloc_addr = value + reloc->r_addend;
+}
+
 #endif /* !dl_machine_h */
 
 #ifdef RESOLVE
@@ -267,7 +272,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
 	  break;
 	case R_68K_GLOB_DAT:
 	case R_68K_JMP_SLOT:
-	  *reloc_addr = value;
+	  *reloc_addr = value + reloc->r_addend;
 	  break;
 	case R_68K_8:
 	  *(char *) reloc_addr = value + reloc->r_addend;
diff --git a/sysdeps/powerpc/dl-machine.h b/sysdeps/powerpc/dl-machine.h
index 70a3f20b31..beabc1d4ff 100644
--- a/sysdeps/powerpc/dl-machine.h
+++ b/sysdeps/powerpc/dl-machine.h
@@ -197,8 +197,7 @@ _dl_runtime_resolve:
  # ...unwind the stack frame, and jump to the PLT entry we updated.
 	addi 1,1,48
 	bctr
-0:
-	.size	 _dl_runtime_resolve,0b-_dl_runtime_resolve
+	.size	 _dl_runtime_resolve,.-_dl_runtime_resolve
 
 	.align 2
 	.globl _dl_prof_resolve
@@ -395,10 +394,6 @@ static ElfW(Addr) _dl_preferred_address = 1
      _dl_preferred_address = mapstart;					      \
 } )
 
-/* We require the address of the PLT entry returned from fixup, not
-   the first word of the PLT entry. */
-#define ELF_FIXUP_RETURN_VALUE(map, result)  ((Elf32_Addr) &(result))
-
 /* Nonzero iff TYPE should not be allowed to resolve to one of
    the main executable's symbols, as for a COPY reloc.  */
 #define elf_machine_lookup_noexec_p(type) ((type) == R_PPC_COPY)
@@ -413,7 +408,7 @@ static ElfW(Addr) _dl_preferred_address = 1
 					  (type) == R_PPC_JMP_SLOT)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	R_PPC_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	R_PPC_JMP_SLOT
 
 /* Nonzero iff TYPE describes relocation of a PLT entry, so
    PLT entries should not be allowed to define the value.  */
@@ -554,6 +549,70 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
   /* elf_machine_runtime_setup handles this. */
 }
 
+static inline void
+elf_machine_fixup_plt(struct link_map *map, const Elf32_Rela *reloc,
+                      Elf32_Addr *reloc_addr, Elf32_Addr finaladdr)
+{
+  Elf32_Sword delta = finaladdr - (Elf32_Word) (char *) reloc_addr;
+  if (delta << 6 >> 6 == delta)
+    *reloc_addr = OPCODE_B (delta);
+  else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000)
+    *reloc_addr = OPCODE_BA (finaladdr);
+  else
+    {
+      Elf32_Word *plt;
+      Elf32_Word index;
+
+      plt = (Elf32_Word *)((char *)map->l_addr
+			   + map->l_info[DT_PLTGOT]->d_un.d_val);
+      index = (reloc_addr - plt - PLT_INITIAL_ENTRY_WORDS)/2;
+      if (index >= PLT_DOUBLE_SIZE)
+	{
+	  /* Slots greater than or equal to 2^13 have 4 words available
+	     instead of two.  */
+	  /* FIXME: There are some possible race conditions in this code,
+	     when called from 'fixup'.
+
+	     1) Suppose that a lazy PLT entry is executing, a context switch
+	     between threads (or a signal) occurs, and the new thread or
+	     signal handler calls the same lazy PLT entry.  Then the PLT entry
+	     would be changed while it's being run, which will cause a segfault
+	     (almost always).
+
+	     2) Suppose the reverse: that a lazy PLT entry is being updated,
+	     a context switch occurs, and the new code calls the lazy PLT
+	     entry that is being updated.  Then the half-fixed PLT entry will
+	     be executed, which will also almost always cause a segfault.
+
+	     These problems don't happen with the 2-word entries, because
+	     only one of the two instructions are changed when a lazy entry
+	     is retargeted at the actual PLT entry; the li instruction stays
+	     the same (we have to update it anyway, because we might not be
+	     updating a lazy PLT entry).  */
+
+	  reloc_addr[0] = OPCODE_LI (11, finaladdr);
+	  reloc_addr[1] = OPCODE_ADDIS (11, 11, finaladdr + 0x8000 >> 16);
+	  reloc_addr[2] = OPCODE_MTCTR (11);
+	  reloc_addr[3] = OPCODE_BCTR ();
+	}
+      else
+	{
+	  Elf32_Word num_plt_entries;
+
+	  num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
+			     / sizeof(Elf32_Rela));
+
+	  plt[index+PLT_DATA_START_WORDS (num_plt_entries)] = finaladdr;
+	  reloc_addr[0] = OPCODE_LI (11, index*4);
+	  reloc_addr[1] = OPCODE_B (-(4*(index*2
+					 + 1
+					 - PLT_LONGBRANCH_ENTRY_WORDS
+					 + PLT_INITIAL_ENTRY_WORDS)));
+	}
+    }
+  MODIFIED_CODE (reloc_addr);
+}
+
 #endif /* dl_machine_h */
 
 #ifdef RESOLVE
@@ -674,66 +733,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
     }
   else if (rinfo == R_PPC_JMP_SLOT)
     {
-      Elf32_Sword delta = finaladdr - (Elf32_Word) (char *) reloc_addr;
-      if (delta << 6 >> 6 == delta)
-	*reloc_addr = OPCODE_B (delta);
-      else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000)
-	*reloc_addr = OPCODE_BA (finaladdr);
-      else
-	{
-	  Elf32_Word *plt;
-	  Elf32_Word index;
-
-	  plt = (Elf32_Word *)((char *)map->l_addr
-			       + map->l_info[DT_PLTGOT]->d_un.d_val);
-	  index = (reloc_addr - plt - PLT_INITIAL_ENTRY_WORDS)/2;
-	  if (index >= PLT_DOUBLE_SIZE)
-	    {
-	      /* Slots greater than or equal to 2^13 have 4 words available
-		 instead of two.  */
-	      /* FIXME: There are some possible race conditions in this code,
-		 when called from 'fixup'.
-
-		 1) Suppose that a lazy PLT entry is executing, a
-		 context switch between threads (or a signal) occurs,
-		 and the new thread or signal handler calls the same
-		 lazy PLT entry.  Then the PLT entry would be changed
-		 while it's being run, which will cause a segfault
-		 (almost always).
-
-		 2) Suppose the reverse: that a lazy PLT entry is
-		 being updated, a context switch occurs, and the new
-		 code calls the lazy PLT entry that is being updated.
-		 Then the half-fixed PLT entry will be executed, which
-		 will also almost always cause a segfault.
-
-		 These problems don't happen with the 2-word entries, because
-		 only one of the two instructions are changed when a lazy
-		 entry is retargeted at the actual PLT entry; the li
-		 instruction stays the same (we have to update it anyway,
-		 because we might not be updating a lazy PLT entry).  */
-	      reloc_addr[0] = OPCODE_LI (11, finaladdr);
-	      reloc_addr[1] = OPCODE_ADDIS (11, 11, finaladdr + 0x8000 >> 16);
-	      reloc_addr[2] = OPCODE_MTCTR (11);
-	      reloc_addr[3] = OPCODE_BCTR ();
-	    }
-	  else
-	    {
-	      Elf32_Word num_plt_entries;
-
-	      num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
-				 / sizeof(Elf32_Rela));
-
-	      plt[index+PLT_DATA_START_WORDS (num_plt_entries)] = finaladdr;
-	      reloc_addr[0] = OPCODE_LI (11, index*4);
-	      reloc_addr[1] =
-		OPCODE_B (-(4*(index*2
-			       + 1
-			       - PLT_LONGBRANCH_ENTRY_WORDS
-			       + PLT_INITIAL_ENTRY_WORDS)));
-	    }
-	}
-      MODIFIED_CODE (reloc_addr);
+      elf_machine_fixup_plt (map, reloc, reloc_addr, finalvalue);
     }
   else
     {
diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h
index b80c126487..288a140245 100644
--- a/sysdeps/sparc/sparc32/dl-machine.h
+++ b/sysdeps/sparc/sparc32/dl-machine.h
@@ -126,13 +126,6 @@ _dl_runtime_resolve:
 	 restore
 	.size _dl_runtime_resolve, . - _dl_runtime_resolve");
 
-/* The address of the JMP_SLOT reloc is the .plt entry, thus we don't
-   dereference the reloc's addr to get the final destination.  Ideally
-   there would be a generic way to return the value of the symbol from
-   elf_machine_relplt, but as it is, the address of the .plt entry is
-   good enough.  */
-#define ELF_FIXUP_RETURN_VALUE(map, result)  ((Elf32_Addr) &(result))
-
 /* Nonzero iff TYPE should not be allowed to resolve to one of
    the main executable's symbols, as for a COPY reloc.  */
 #define elf_machine_lookup_noexec_p(type) ((type) == R_SPARC_COPY)
@@ -142,7 +135,7 @@ _dl_runtime_resolve:
 #define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	R_SPARC_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	R_SPARC_JMP_SLOT
 
 /* The SPARC never uses Elf32_Rel relocations.  */
 #define ELF_MACHINE_NO_REL 1
@@ -150,9 +143,6 @@ _dl_runtime_resolve:
 /* The SPARC overlaps DT_RELA and DT_PLTREL.  */
 #define ELF_MACHINE_PLTREL_OVERLAP 1
 
-/* The PLT uses Elf32_Rela relocs.  */
-#define elf_machine_relplt elf_machine_rela
-
 /* Initial entry point code for the dynamic linker.
    The C function `_dl_start' is the real entry point;
    its return value is the user program's entry point.  */
@@ -246,7 +236,30 @@ _dl_start_user:
 	.size   _dl_start_user,.-_dl_start_user
 .previous");
 
+static inline void
+elf_machine_fixup_plt (struct link_map *map, const Elf32_Rela *reloc,
+		       Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+  /* For thread safety, write the instructions from the bottom and
+     flush before we overwrite the critical "b,a".  This of course
+     need not be done during bootstrapping, since there are no threads.
+     But we also can't tell if we _can_ use flush, so don't. */
+
+  reloc_addr[2] = OPCODE_JMP_G1 | (value & 0x3ff);
+#ifndef RTLD_BOOTSTRAP
+  if (_dl_hwcap & HWCAP_SPARC_FLUSH)
+    __asm __volatile ("flush %0+8" : : "r"(reloc_addr));
+#endif
+
+  reloc_addr[1] = OPCODE_SETHI_G1 | (value >> 10);
+#ifndef RTLD_BOOTSTRAP
+  if (_dl_hwcap & HWCAP_SPARC_FLUSH)
+    __asm __volatile ("flush %0+4" : : "r"(reloc_addr));
+#endif
+}
+
 #ifdef RESOLVE
+
 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
    MAP is the object containing the reloc.  */
 
@@ -305,14 +318,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
 	  *reloc_addr = value;
 	  break;
 	case R_SPARC_JMP_SLOT:
-	  /* For thread safety, write the instructions from the bottom and
-	     flush before we overwrite the critical "b,a".  */
-	  reloc_addr[2] = OPCODE_JMP_G1 | (value & 0x3ff);
-	  if (_dl_hwcap & HWCAP_SPARC_FLUSH)
-	    __asm __volatile ("flush %0+8" : : "r"(reloc_addr));
-	  reloc_addr[1] = OPCODE_SETHI_G1 | (value >> 10);
-	  if (_dl_hwcap & HWCAP_SPARC_FLUSH)
-	    __asm __volatile ("flush %0+4" : : "r"(reloc_addr));
+	  elf_machine_fixup_plt(map, reloc, reloc_addr, value);
 	  break;
 	case R_SPARC_8:
 	  *(char *) reloc_addr = value;
diff --git a/sysdeps/sparc/sparc64/dl-machine.h b/sysdeps/sparc/sparc64/dl-machine.h
index e302f4a1fe..226623152d 100644
--- a/sysdeps/sparc/sparc64/dl-machine.h
+++ b/sysdeps/sparc/sparc64/dl-machine.h
@@ -67,7 +67,26 @@ elf_machine_load_address (void)
   return pc - *(Elf64_Addr *)(elf_pic_register + la);
 }
 
+static inline void
+elf_machine_fixup_plt(struct link_map *map, const Elf64_Rela *reloc,
+                      Elf64_Addr *reloc_addr, Elf64_Addr value)
+{
+  Elf64_Dyn *pltfmt = map->l_info[DT_SPARC(PLTFMT)];
+  switch (pltfmt ? pltfmt->d_un.d_val : 0)
+    {
+    case 1: /* .got.plt with absolute addresses */
+      *reloc_addr = value;
+      break;
+    case 2: /* .got.plt with got-relative addresses */
+      *reloc_addr = value - (map->l_info[DT_PLTGOT]->d_un.d_ptr + map->l_addr);
+      break;
+    default:
+      assert (! "unexpected .plt format type");
+    }
+}
+
 #ifdef RESOLVE
+
 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
    MAP is the object containing the reloc.  */
 
@@ -160,21 +179,7 @@ elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc,
 	  break;
 
 	case R_SPARC_JMP_SLOT:
-	  {
-	    Elf64_Dyn *pltfmt = map->l_info[DT_SPARC(PLTFMT)];
-	    switch (pltfmt ? pltfmt->d_un.d_val : 0)
-	      {
-	      case 1: /* .got.plt with absolute addresses */
-		*reloc_addr = value;
-	        break;
-	      case 2: /* .got.plt with got-relative addresses */
-		*reloc_addr = value - (map->l_info[DT_PLTGOT]->d_un.d_ptr
-				       + map->l_addr);
-		break;
-	      default:
-		assert (! "unexpected .plt format type");
-	      }
-	  }
+	  elf_machine_fixup_plt(map, reloc, reloc_addr, value);
 	  break;
 
 	case R_SPARC_NONE:		/* Alright, Wilbur.  */
@@ -212,7 +217,7 @@ elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc)
 #define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
 
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
-#define ELF_MACHINE_RELOC_NOPLT	R_SPARC_JMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	R_SPARC_JMP_SLOT
 
 /* The SPARC never uses Elf64_Rel relocations.  */
 #define ELF_MACHINE_NO_REL 1
@@ -220,13 +225,6 @@ elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc)
 /* The SPARC overlaps DT_RELA and DT_PLTREL.  */
 #define ELF_MACHINE_PLTREL_OVERLAP 1
 
-/* The return value from dl-runtime's fixup, if it should be special.  */
-#define ELF_FIXUP_RETURN_VALUE(map, result)				\
-  ((map)->l_info[DT_SPARC(PLTFMT)]					\
-   && (map)->l_info[DT_SPARC(PLTFMT)]->d_un.d_val == 2			\
-   ? (result) + (map)->l_info[DT_PLTGOT]->d_un.d_ptr + (map)->l_addr	\
-   : (result))
-
 /* Set up the loaded object described by L so its unrelocated PLT
    entries will jump to the on-demand fixup code in dl-runtime.c.  */
 
diff --git a/sysdeps/stub/dl-machine.h b/sysdeps/stub/dl-machine.h
index 239d0b0e9f..f787df3500 100644
--- a/sysdeps/stub/dl-machine.h
+++ b/sysdeps/stub/dl-machine.h
@@ -1,5 +1,5 @@
 /* Machine-dependent ELF dynamic relocation inline functions.  Stub version.
-   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1997 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
@@ -51,9 +51,14 @@ elf_machine_load_address (void)
 #error "Where am I?"
 }
 
-/* This can modify DYNAMIC_INFO to avoid relocating code in
-   the functions above if they are doing bizarre magic.  */
-#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
+/* Fixup a PLT entry to bounce directly to the function at VALUE.  */
+
+static inline void
+elf_machine_fixup_plt (struct link_map *map, const Elf32_Rel *reloc,
+		       Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+  *reloc_addr = value;
+}
 
 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
    LOADADDR is the load address of the object; INFO is an array indexed
@@ -82,7 +87,7 @@ elf_machine_rel (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
 }
 
 
-static inline void
+static inline Elf32_Addr
 elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
 		  const Elf32_Rel *reloc, const Elf32_Sym *sym,
 		  Elf32_Addr (*resolve) (const Elf32_Sym **ref,
@@ -107,7 +112,7 @@ elf_machine_runtime_setup (struct link_map *l, int lazy)
 {
   extern void _dl_runtime_resolve (Elf32_Word);
 
-  if (lazy) 
+  if (lazy)
     {
       /* The GOT entries for functions in the PLT have not yet been filled
          in.  Their initial contents will arrange when called to push an
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index a3b0eef691..d5c486d7d0 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -32,6 +32,7 @@ nfsservctl	EXTRA	nfsservctl	3	nfsservctl
 pause		-	pause		0	__libc_pause	pause
 personality	init-first personality	1	__personality	personality
 pipe		-	pipe		1	__pipe		pipe
+prctl		EXTRA	prctl		5
 query_module	EXTRA	query_module	5	query_module
 quotactl	EXTRA	quotactl	4	quotactl
 s_getdents	EXTRA	getdents	3	__getdents