Merge changes between r677 and r858 from /fsf/trunk.

git-svn-id: svn://svn.eglibc.org/trunk@859 7b3dc134-2b1b-0410-93df-9e9f96275f8d

7 files changed, 103 insertions, 60 deletions

diff --git a/libc/sysdeps/unix/sysv/linux/i386/clone.S b/libc/sysdeps/unix/sysv/linux/i386/clone.S
index 54524ec12..f73a4b519 100644
--- a/libc/sysdeps/unix/sysv/linux/i386/clone.S
+++ b/libc/sysdeps/unix/sysv/linux/i386/clone.S
@@ -120,6 +120,9 @@ L(pseudo_end):
 	ret
 
 L(thread_start):
+	cfi_startproc;
+	/* Clearing frame pointer is insufficient, use CFI.  */
+	cfi_undefined (eip);
 	/* Note: %esi is zero.  */
 	movl	%esi,%ebp	/* terminate the stack frame */
 #ifdef RESET_PID
@@ -152,6 +155,7 @@ L(nomoregetpid):
 	jmp	L(haspid)
 	.previous
 #endif
+	cfi_endproc;
 
 	cfi_startproc
 PSEUDO_END (BP_SYM (__clone))
diff --git a/libc/sysdeps/unix/sysv/linux/i386/getgroups.c b/libc/sysdeps/unix/sysv/linux/i386/getgroups.c
index b7a0a4efd..f69baf943 100644
--- a/libc/sysdeps/unix/sysv/linux/i386/getgroups.c
+++ b/libc/sysdeps/unix/sysv/linux/i386/getgroups.c
@@ -52,8 +52,6 @@ __getgroups (int n, gid_t *groups)
     }
   else
     {
-      int i, ngids;
-      __kernel_gid_t kernel_groups[n = MIN (n, __sysconf (_SC_NGROUPS_MAX))];
 # ifdef __NR_getgroups32
       if (__libc_missing_32bit_uids <= 0)
 	{
@@ -69,6 +67,9 @@ __getgroups (int n, gid_t *groups)
 	}
 # endif /* __NR_getgroups32 */
 
+      int i, ngids;
+      __kernel_gid_t kernel_groups[n = MIN (n, __sysconf (_SC_NGROUPS_MAX))];
+
       ngids = INLINE_SYSCALL (getgroups, 2, n, CHECK_N (kernel_groups, n));
       if (n != 0 && ngids > 0)
 	for (i = 0; i < ngids; i++)
diff --git a/libc/sysdeps/unix/sysv/linux/sh/sys/io.h b/libc/sysdeps/unix/sysv/linux/sh/sys/io.h
deleted file mode 100644
index 6fdc44ff8..000000000
--- a/libc/sysdeps/unix/sysv/linux/sh/sys/io.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/* Copyright (C) 1996, 1998, 1999, 2000 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, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#ifndef	_SYS_IO_H
-
-#define	_SYS_IO_H	1
-#include <features.h>
-
-__BEGIN_DECLS
-
-/* If TURN_ON is TRUE, request for permission to do direct i/o on the
-   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
-   permission off for that range.  This call requires root privileges.  */
-extern int ioperm (unsigned long int __from, unsigned long int __num,
-		   int __turn_on) __THROW;
-
-/* Set the I/O privilege level to LEVEL.  If LEVEL is nonzero,
-   permission to access any I/O port is granted.  This call requires
-   root privileges. */
-extern int iopl (int __level) __THROW;
-
-/* The functions that actually perform reads and writes.  */
-extern unsigned char inb (unsigned long int port) __THROW;
-extern unsigned short int inw (unsigned long int port) __THROW;
-extern unsigned long int inl (unsigned long int port) __THROW;
-
-extern void outb (unsigned char value, unsigned long int port) __THROW;
-extern void outw (unsigned short value, unsigned long int port) __THROW;
-extern void outl (unsigned long value, unsigned long int port) __THROW;
-
-__END_DECLS
-
-#endif /* _SYS_IO_H */
diff --git a/libc/sysdeps/unix/sysv/linux/x86_64/Makefile b/libc/sysdeps/unix/sysv/linux/x86_64/Makefile
index 0f2036723..bdad5063d 100644
--- a/libc/sysdeps/unix/sysv/linux/x86_64/Makefile
+++ b/libc/sysdeps/unix/sysv/linux/x86_64/Makefile
@@ -10,6 +10,6 @@ ifeq ($(subdir),stdlib)
 sysdep_routines += __start_context
 endif
 
-ifeq ($(subdir),stdlib)
+ifeq ($(subdir),csu)
 gen-as-const-headers += ucontext_i.sym
 endif
diff --git a/libc/sysdeps/unix/sysv/linux/x86_64/clone.S b/libc/sysdeps/unix/sysv/linux/x86_64/clone.S
index 8a12b0903..db42f209c 100644
--- a/libc/sysdeps/unix/sysv/linux/x86_64/clone.S
+++ b/libc/sysdeps/unix/sysv/linux/x86_64/clone.S
@@ -89,6 +89,9 @@ L(pseudo_end):
 	ret
 
 L(thread_start):
+	cfi_startproc;
+	/* Clearing frame pointer is insufficient, use CFI.  */
+	cfi_undefined (rip);
 	/* Clear the frame pointer.  The ABI suggests this be done, to mark
 	   the outermost frame obviously.  */
 	xorl	%ebp, %ebp
@@ -113,6 +116,7 @@ L(thread_start):
 	/* Call exit with return value from function call. */
 	movq	%rax, %rdi
 	call	HIDDEN_JUMPTARGET (_exit)
+	cfi_endproc;
 
 	cfi_startproc;
 PSEUDO_END (BP_SYM (__clone))
diff --git a/libc/sysdeps/unix/sysv/linux/x86_64/sigaction.c b/libc/sysdeps/unix/sysv/linux/x86_64/sigaction.c
index b83e98a77..ab1012385 100644
--- a/libc/sysdeps/unix/sysv/linux/x86_64/sigaction.c
+++ b/libc/sysdeps/unix/sysv/linux/x86_64/sigaction.c
@@ -33,6 +33,8 @@
    translate it here.  */
 #include <kernel_sigaction.h>
 
+#include "ucontext_i.h"
+
 /* We do not globally define the SA_RESTORER flag so do it here.  */
 #define SA_RESTORER 0x04000000
 
@@ -90,18 +92,95 @@ weak_alias (__libc_sigaction, sigaction)
    signal handlers work right.  Important are both the names
    (__restore_rt) and the exact instruction sequence.
    If you ever feel the need to make any changes, please notify the
-   appropriate GDB maintainer.  */
+   appropriate GDB maintainer.
+
+   The unwind information starts a byte before __restore_rt, so that
+   it is found when unwinding, to get an address the unwinder assumes
+   will be in the middle of a call instruction.  See the Linux kernel
+   (the i386 vsyscall, in particular) for an explanation of the complex
+   unwind information used here in order to get the traditional CFA.
+   We do not restore cs - it's only stored as two bytes here so that's
+   a bit tricky.  We don't use the gas cfi directives, so that we can
+   reliably add .cfi_signal_frame.  */
+
+#define do_cfa_expr						\
+  "	.byte 0x0f\n"		/* DW_CFA_def_cfa_expression */	\
+  "	.uleb128 2f-1f\n"	/* length */			\
+  "1:	.byte 0x77\n"		/* DW_OP_breg7 */		\
+  "	.sleb128 " CFI_STRINGIFY (oRSP) "\n"			\
+  "	.byte 0x06\n"		/* DW_OP_deref */		\
+  "2:"
+
+#define do_expr(regno, offset)					\
+  "	.byte 0x10\n"		/* DW_CFA_expression */		\
+  "	.uleb128 " CFI_STRINGIFY (regno) "\n"			\
+  "	.uleb128 2f-1f\n"	/* length */			\
+  "1:	.byte 0x77\n"		/* DW_OP_breg7 */		\
+  "	.sleb128 " CFI_STRINGIFY (offset) "\n"			\
+  "2:"
 
 #define RESTORE(name, syscall) RESTORE2 (name, syscall)
 # define RESTORE2(name, syscall) \
-asm						\
-  (						\
-   ".align 16\n"				\
-   CFI_STARTPROC "\n"				\
-   "__" #name ":\n"				\
-   "	movq $" #syscall ", %rax\n"		\
-   "	syscall\n"				\
-   CFI_ENDPROC "\n"				\
+asm									\
+  (									\
+   /* `nop' for debuggers assuming `call' should not disalign the code.  */ \
+   "	nop\n"								\
+   ".align 16\n"							\
+   ".LSTART_" #name ":\n"						\
+   "	.type __" #name ",@function\n"					\
+   "__" #name ":\n"							\
+   "	movq $" #syscall ", %rax\n"					\
+   "	syscall\n"							\
+   ".LEND_" #name ":\n"							\
+   ".section .eh_frame,\"a\",@progbits\n"				\
+   ".LSTARTFRAME_" #name ":\n"						\
+   "	.long .LENDCIE_" #name "-.LSTARTCIE_" #name "\n"		\
+   ".LSTARTCIE_" #name ":\n"						\
+   "	.long 0\n"	/* CIE ID */					\
+   "	.byte 1\n"	/* Version number */				\
+   "	.string \"zRS\"\n" /* NUL-terminated augmentation string */	\
+   "	.uleb128 1\n"	/* Code alignment factor */			\
+   "	.sleb128 -8\n"	/* Data alignment factor */			\
+   "	.uleb128 16\n"	/* Return address register column (rip) */	\
+   /* Augmentation value length */					\
+   "	.uleb128 .LENDAUGMNT_" #name "-.LSTARTAUGMNT_" #name "\n"	\
+   ".LSTARTAUGMNT_" #name ":\n"						\
+   "	.byte 0x1b\n"	/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */		\
+   ".LENDAUGMNT_" #name ":\n"						\
+   "	.align 8\n"							\
+   ".LENDCIE_" #name ":\n"						\
+   "	.long .LENDFDE_" #name "-.LSTARTFDE_" #name "\n" /* FDE len */	\
+   ".LSTARTFDE_" #name ":\n"						\
+   "	.long .LSTARTFDE_" #name "-.LSTARTFRAME_" #name "\n" /* CIE */	\
+   /* `LSTART_' is subtracted 1 as debuggers assume a `call' here.  */	\
+   "	.long (.LSTART_" #name "-1)-.\n" /* PC-relative start addr.  */	\
+   "	.long .LEND_" #name "-(.LSTART_" #name "-1)\n"			\
+   "	.uleb128 0\n"			/* FDE augmentation length */	\
+   do_cfa_expr								\
+   do_expr (8 /* r8 */, oR8)						\
+   do_expr (9 /* r9 */, oR9)						\
+   do_expr (10 /* r10 */, oR10)						\
+   do_expr (11 /* r11 */, oR11)						\
+   do_expr (12 /* r12 */, oR12)						\
+   do_expr (13 /* r13 */, oR13)						\
+   do_expr (14 /* r14 */, oR14)						\
+   do_expr (15 /* r15 */, oR15)						\
+   do_expr (5 /* rdi */, oRDI)						\
+   do_expr (4 /* rsi */, oRSI)						\
+   do_expr (6 /* rbp */, oRBP)						\
+   do_expr (3 /* rbx */, oRBX)						\
+   do_expr (1 /* rdx */, oRDX)						\
+   do_expr (0 /* rax */, oRAX)						\
+   do_expr (2 /* rcx */, oRCX)						\
+   do_expr (7 /* rsp */, oRSP)						\
+   do_expr (16 /* rip */, oRIP)						\
+   /* libgcc-4.1.1 has only `DWARF_FRAME_REGISTERS == 17'.  */		\
+   /* do_expr (49 |* rflags *|, oEFL) */				\
+   /* `cs'/`ds'/`fs' are unaligned and a different size.  */		\
+   /* gas: Error: register save offset not a multiple of 8  */		\
+   "	.align 8\n"							\
+   ".LENDFDE_" #name ":\n"						\
+   "	.previous\n"							\
    );
 /* The return code for realtime-signals.  */
 RESTORE (restore_rt, __NR_rt_sigreturn)
diff --git a/libc/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym b/libc/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
index b3cfe9aa4..af3e0e544 100644
--- a/libc/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
+++ b/libc/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
@@ -18,6 +18,8 @@ oRSP		mreg (RSP)
 oRBX		mreg (RBX)
 oR8		mreg (R8)
 oR9		mreg (R9)
+oR10		mreg (R10)
+oR11		mreg (R11)
 oR12		mreg (R12)
 oR13		mreg (R13)
 oR14		mreg (R14)
@@ -28,6 +30,7 @@ oRDX		mreg (RDX)
 oRAX		mreg (RAX)
 oRCX		mreg (RCX)
 oRIP		mreg (RIP)
+oEFL		mreg (EFL)
 oFPREGS		mcontext (fpregs)
 oSIGMASK	ucontext (uc_sigmask)
 oFPREGSMEM	ucontext (__fpregs_mem)