* sysdeps/unix/sysv/linux/alpha/Makefile [stdlib]: Process ucontext-offsets.sym. * sysdeps/unix/sysv/linux/alpha/getcontext.S: New file. * sysdeps/unix/sysv/linux/alpha/makecontext.S: New file. * sysdeps/unix/sysv/linux/alpha/setcontext.S: New file. * sysdeps/unix/sysv/linux/alpha/swapcontext.S: New file. * sysdeps/unix/sysv/linux/alpha/ucontext-offsets.sym: New file.

	* sysdeps/unix/sysv/linux/alpha/Makefile [stdlib]: Process
	ucontext-offsets.sym.
	* sysdeps/unix/sysv/linux/alpha/getcontext.S: New file.
	* sysdeps/unix/sysv/linux/alpha/makecontext.S: New file.
	* sysdeps/unix/sysv/linux/alpha/setcontext.S: New file.
	* sysdeps/unix/sysv/linux/alpha/swapcontext.S: New file.
	* sysdeps/unix/sysv/linux/alpha/ucontext-offsets.sym: New file.

2004-01-15  Richard Henderson  <rth@redhat.com>

6 files changed, 458 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/Makefile b/sysdeps/unix/sysv/linux/alpha/Makefile
index 3097cc3..37a9214 100644
--- a/sysdeps/unix/sysv/linux/alpha/Makefile
+++ b/sysdeps/unix/sysv/linux/alpha/Makefile
@@ -2,6 +2,10 @@ ifeq ($(subdir),posix)
 sysdep_routines += oldglob
 endif
 
+ifeq ($(subdir),stdlib)
+gen-as-const-headers += ucontext-offsets.sym
+endif
+
 ifeq ($(subdir),misc)
 sysdep_headers += alpha/ptrace.h alpha/regdef.h sys/io.h
 
diff --git a/sysdeps/unix/sysv/linux/alpha/getcontext.S b/sysdeps/unix/sysv/linux/alpha/getcontext.S
new file mode 100644
index 0000000..3566890
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/getcontext.S
@@ -0,0 +1,186 @@
+/* Save current context.
+   Copyright (C) 2004 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.  */
+
+#include <sysdep.h>
+#include <ucontext-offsets.h>
+
+/* ??? Should be a better place for this that's asm friendly.  */
+#define SIG_BLOCK     1
+
+
+ENTRY (__getcontext)
+#ifdef PROF
+	ldgp    gp, 0(pv)
+	.set noat
+	lda     AT, _mcount
+	jsr     AT, (AT), _mcount
+	.set at
+	.prologue 1
+#else
+	.prologue 0
+#endif
+
+	bsr	$0, __getcontext_x
+	mov	$31, $0
+	ret
+
+END(__getcontext)
+weak_alias(__getcontext, getcontext)
+
+
+/* An internal routine used by getcontext and setcontext.
+   The incomming return address register is $0.  */
+
+	.align	4
+	.globl	__getcontext_x
+	.hidden	__getcontext_x
+	.usepv	__getcontext_x, no
+
+	cfi_startproc
+	cfi_return_column (64)
+__getcontext_x:
+	cfi_register (64, 0)
+
+	/* Return value of getcontext.  $0 is the only register
+	   whose value is not preserved. */
+	stq	$31, UC_SIGCTX+SC_REGS($16)
+
+	/* Store all registers into the context.  */
+	stq	$1, UC_SIGCTX+SC_REGS+1*8($16)
+	stq	$2, UC_SIGCTX+SC_REGS+2*8($16)
+	stq	$3, UC_SIGCTX+SC_REGS+3*8($16)
+	stq	$4, UC_SIGCTX+SC_REGS+4*8($16)
+	stq	$5, UC_SIGCTX+SC_REGS+5*8($16)
+	stq	$6, UC_SIGCTX+SC_REGS+6*8($16)
+	stq	$7, UC_SIGCTX+SC_REGS+7*8($16)
+	stq	$8, UC_SIGCTX+SC_REGS+8*8($16)
+	stq	$9, UC_SIGCTX+SC_REGS+9*8($16)
+	stq	$10, UC_SIGCTX+SC_REGS+10*8($16)
+	stq	$11, UC_SIGCTX+SC_REGS+11*8($16)
+	stq	$12, UC_SIGCTX+SC_REGS+12*8($16)
+	stq	$13, UC_SIGCTX+SC_REGS+13*8($16)
+	stq	$14, UC_SIGCTX+SC_REGS+14*8($16)
+	stq	$15, UC_SIGCTX+SC_REGS+15*8($16)
+	stq	$16, UC_SIGCTX+SC_REGS+16*8($16)
+	stq	$17, UC_SIGCTX+SC_REGS+17*8($16)
+	stq	$18, UC_SIGCTX+SC_REGS+18*8($16)
+	stq	$19, UC_SIGCTX+SC_REGS+19*8($16)
+	stq	$20, UC_SIGCTX+SC_REGS+20*8($16)
+	stq	$21, UC_SIGCTX+SC_REGS+21*8($16)
+	stq	$22, UC_SIGCTX+SC_REGS+22*8($16)
+	stq	$23, UC_SIGCTX+SC_REGS+23*8($16)
+	stq	$24, UC_SIGCTX+SC_REGS+24*8($16)
+	stq	$25, UC_SIGCTX+SC_REGS+25*8($16)
+	stq	$26, UC_SIGCTX+SC_REGS+26*8($16)
+	stq	$27, UC_SIGCTX+SC_REGS+27*8($16)
+	stq	$28, UC_SIGCTX+SC_REGS+28*8($16)
+	stq	$29, UC_SIGCTX+SC_REGS+29*8($16)
+	stq	$30, UC_SIGCTX+SC_REGS+30*8($16)
+	stq	$31, UC_SIGCTX+SC_REGS+31*8($16)
+
+	stt	$f0, UC_SIGCTX+SC_FPREGS+0*8($16)
+	stt	$f1, UC_SIGCTX+SC_FPREGS+1*8($16)
+	stt	$f2, UC_SIGCTX+SC_FPREGS+2*8($16)
+	stt	$f3, UC_SIGCTX+SC_FPREGS+3*8($16)
+	stt	$f4, UC_SIGCTX+SC_FPREGS+4*8($16)
+	stt	$f5, UC_SIGCTX+SC_FPREGS+5*8($16)
+	stt	$f6, UC_SIGCTX+SC_FPREGS+6*8($16)
+	stt	$f7, UC_SIGCTX+SC_FPREGS+7*8($16)
+	stt	$f8, UC_SIGCTX+SC_FPREGS+8*8($16)
+	stt	$f9, UC_SIGCTX+SC_FPREGS+9*8($16)
+	stt	$f10, UC_SIGCTX+SC_FPREGS+10*8($16)
+	stt	$f11, UC_SIGCTX+SC_FPREGS+11*8($16)
+	stt	$f12, UC_SIGCTX+SC_FPREGS+12*8($16)
+	stt	$f13, UC_SIGCTX+SC_FPREGS+13*8($16)
+	stt	$f14, UC_SIGCTX+SC_FPREGS+14*8($16)
+	stt	$f15, UC_SIGCTX+SC_FPREGS+15*8($16)
+	stt	$f16, UC_SIGCTX+SC_FPREGS+16*8($16)
+	stt	$f17, UC_SIGCTX+SC_FPREGS+17*8($16)
+	stt	$f18, UC_SIGCTX+SC_FPREGS+18*8($16)
+	stt	$f19, UC_SIGCTX+SC_FPREGS+19*8($16)
+	stt	$f20, UC_SIGCTX+SC_FPREGS+20*8($16)
+	stt	$f21, UC_SIGCTX+SC_FPREGS+21*8($16)
+	stt	$f22, UC_SIGCTX+SC_FPREGS+22*8($16)
+	stt	$f23, UC_SIGCTX+SC_FPREGS+23*8($16)
+	stt	$f24, UC_SIGCTX+SC_FPREGS+24*8($16)
+	stt	$f25, UC_SIGCTX+SC_FPREGS+25*8($16)
+	stt	$f26, UC_SIGCTX+SC_FPREGS+26*8($16)
+	stt	$f27, UC_SIGCTX+SC_FPREGS+27*8($16)
+	stt	$f28, UC_SIGCTX+SC_FPREGS+28*8($16)
+	stt	$f29, UC_SIGCTX+SC_FPREGS+29*8($16)
+	stt	$f30, UC_SIGCTX+SC_FPREGS+30*8($16)
+	stt	$f31, UC_SIGCTX+SC_FPREGS+31*8($16)
+
+	mf_fpcr $f0
+	lda	$1, 8
+	stt	$f0, UC_SIGCTX+SC_FPCR($16)
+
+	/* The return address of getcontext is the restart pc.  */
+	stq	$26, UC_SIGCTX+SC_PC($16)
+
+	/* Userlevel always has a processor status word of 8.  */
+	stq	$1, UC_SIGCTX+SC_PS($16)
+
+	/* Save registers around the syscall.  We preserve $17
+	   for the benefit of swapcontext.  */
+	subq	$30, 4*8, $30
+	cfi_adjust_cfa_offset(4*8)
+	stq	$0, 0($30)
+	cfi_rel_offset(64, 0)
+	stq	$16, 8($30)
+	stq	$17, 16($30)
+
+	/* Save the current signal mask.  Whee, there are three
+	   copies of this in the alpha ucontext_t.  */
+	lda	$16, SIG_BLOCK
+	lda	$17, 0
+	lda	$0, __NR_osf_sigprocmask
+	callsys
+
+	ldq	$16, 8($30)
+	ldq	$17, 16($30)
+
+	stq	$0, UC_OSF_SIGMASK($16)
+	stq	$0, UC_SIGCTX+SC_MASK($16)
+	stq	$0, UC_SIGMASK($16)
+	stq	$31, UC_SIGMASK + 1*8($16)
+	stq	$31, UC_SIGMASK + 2*8($16)
+	stq	$31, UC_SIGMASK + 3*8($16)
+	stq	$31, UC_SIGMASK + 4*8($16)
+	stq	$31, UC_SIGMASK + 5*8($16)
+	stq	$31, UC_SIGMASK + 6*8($16)
+	stq	$31, UC_SIGMASK + 7*8($16)
+	stq	$31, UC_SIGMASK + 8*8($16)
+	stq	$31, UC_SIGMASK + 9*8($16)
+	stq	$31, UC_SIGMASK +10*8($16)
+	stq	$31, UC_SIGMASK +11*8($16)
+	stq	$31, UC_SIGMASK +12*8($16)
+	stq	$31, UC_SIGMASK +13*8($16)
+	stq	$31, UC_SIGMASK +14*8($16)
+	stq	$31, UC_SIGMASK +15*8($16)
+
+	ldq	$0, 0($30)
+	addq	$30, 4*8, $30
+	cfi_register (64, 0)
+	cfi_adjust_cfa_offset(-4*8)
+	ret	$31, ($0), 1
+
+	cfi_endproc
+	.size	__getcontext_x, .-__getcontext_x
+	.type	__getcontext_x, @function
diff --git a/sysdeps/unix/sysv/linux/alpha/makecontext.S b/sysdeps/unix/sysv/linux/alpha/makecontext.S
new file mode 100644
index 0000000..223117e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/makecontext.S
@@ -0,0 +1,164 @@
+/* Copyright (C) 2004 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.  */
+
+#include <sysdep.h>
+#include <ucontext-offsets.h>
+
+
+ENTRY(__makecontext)
+	ldgp	$29, 0($27)
+#ifdef PROF
+	.set noat
+	lda     AT, _mcount
+	jsr     AT, (AT), _mcount
+	.set at
+#endif
+	.prologue 1
+
+	/* Compute top of stack, including arguments.  */
+	ldq	$1, UC_STACK+SS_SP($16)
+	ldq	$2, UC_STACK+SS_SIZE($16)
+	addq	$1, $2, $8
+	subq	$18, 6, $1
+	cmovlt	$1, 0, $1
+	s8addq	$1, 0, $2
+	subq	$8, $2, $8
+
+	/* Copy all parameters.  Switch statement header here.  */
+	ldah	$3, $jumptable($29)	!gprelhigh
+	cmple	$18, 6, $1
+	mov	$18, $2
+	cmoveq	$1, 7, $2
+	s4addq	$2, $3, $3
+	ldl	$4, $jumptable($3)	!gprellow
+	addq	$4, $29, $4
+	jmp	$31, ($4), $args1
+
+	.section .rodata
+	.align	2
+$jumptable:
+	.gprel32  $args0
+	.gprel32  $args1
+	.gprel32  $args2
+	.gprel32  $args3
+	.gprel32  $args4
+	.gprel32  $args5
+	.gprel32  $args6
+	.gprel32  $argsN
+	.text
+
+	/* Here we process arguments 7 through N.  This is a straight
+	   stack-to-stack copy.  */
+	.align	4
+$argsN:
+	subq	$18, 6, $1
+	lda	$2, 0($8)
+	lda	$3, 3*8($30)
+	.align	4
+1:
+	ldq	$0, 0($3)
+	subq	$1, 1, $1
+	lda	$3, 8($3)
+	stq	$0, 0($2)
+	lda	$2, 8($2)
+	bne	$1, 1b
+
+	/* Here we process arguments 6 through 0.  This involves
+	   copying into the register save areas of the ucontext.  */
+	.align	4
+$args6:
+	ldq	$0, 2*8($30)
+	stq	$0, UC_SIGCTX+SC_REGS+21*8($16)
+	unop
+	stq	$0, UC_SIGCTX+SC_FPREGS+21*8($16)
+$args5:
+	ldq	$0, 1*8($30)
+	stq	$0, UC_SIGCTX+SC_REGS+20*8($16)
+	unop
+	stq	$0, UC_SIGCTX+SC_FPREGS+20*8($16)
+$args4:
+	ldq	$0, 0*8($30)
+	stq	$0, UC_SIGCTX+SC_REGS+19*8($16)
+	unop
+	stq	$0, UC_SIGCTX+SC_FPREGS+19*8($16)
+$args3:
+	unop
+	stq	$21, UC_SIGCTX+SC_REGS+18*8($16)
+	unop
+	stt	$f21, UC_SIGCTX+SC_FPREGS+18*8($16)
+$args2:
+	unop
+	stq	$20, UC_SIGCTX+SC_REGS+17*8($16)
+	unop
+	stt	$f20, UC_SIGCTX+SC_FPREGS+17*8($16)
+$args1:
+	unop
+	stq	$19, UC_SIGCTX+SC_REGS+16*8($16)
+	unop
+	stt	$f19, UC_SIGCTX+SC_FPREGS+16*8($16)
+$args0:
+
+	/* Set up the registers ready to invoke __startcontext.
+	   We seed $27 with the target function address, and $9
+	   with the link from ucp.  */
+	ldah	$0, __startcontext($29)		!gprelhigh
+	ldq	$1, UC_LINK($16)
+	lda	$0, __startcontext($0)		!gprellow
+	stq	$17, UC_SIGCTX+SC_REGS+27*8($16)
+	stq	$8, UC_SIGCTX+SC_REGS+30*8($16)
+	stq	$0, UC_SIGCTX+SC_PC($16)
+	stq	$1, UC_SIGCTX+SC_REGS+9*8($16)
+
+	/* No return value from makecontext.  */
+	ret
+
+END(__makecontext)
+weak_alias (__makecontext, makecontext)
+
+/* This function is where a new makecontext "thread" begins life.
+   We have already set up $27 for calling the target function, and
+   we've set $9 to the UC_LINK of the parent context.
+
+   If the function returns, we either jump to the linked context
+   (if non-null) or exit.  */
+
+	.align	4
+	.ent	__startcontext
+__startcontext:
+	.frame $31, 0, $31, 0
+	.prologue 0
+
+	jsr	$26, ($27), 0
+	ldgp	$29, 0($26)
+	mov	$9, $16
+	beq	$9, 1f
+
+#ifdef PIC
+	bsr	$26, __setcontext		!samegp
+1:	mov	$31, $16
+	bsr	$26, HIDDEN_JUMPTARGET(exit)	!samegp
+#else
+	jsr	$26, __setcontext
+	ldgp	$29, 0($26)
+1:	mov	$31, $16
+	jsr	$26, HIDDEN_JUMPTARGET(exit)
+#endif
+
+	halt
+
+	.end __startcontext
diff --git a/sysdeps/unix/sysv/linux/alpha/setcontext.S b/sysdeps/unix/sysv/linux/alpha/setcontext.S
new file mode 100644
index 0000000..7d443d4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/setcontext.S
@@ -0,0 +1,35 @@
+/* Install given context.
+   Copyright (C) 2004 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.  */
+
+#include <sysdep.h>
+#include <ucontext-offsets.h>
+
+
+/* In case the user fiddled it, copy the "official" signal mask
+   from the ucontext_t into the sigcontext structure.  */
+#undef PSEUDO_PREPARE_ARGS
+#define PSEUDO_PREPARE_ARGS			\
+	ldq	$0, UC_SIGMASK($16);		\
+	stq	$0, UC_SIGCTX+SC_MASK($16);	\
+	lda	$16, UC_SIGCTX($16);
+
+PSEUDO(__setcontext, sigreturn, 1)
+	ret
+PSEUDO_END(__setcontext)
+weak_alias(__setcontext, setcontext)
diff --git a/sysdeps/unix/sysv/linux/alpha/swapcontext.S b/sysdeps/unix/sysv/linux/alpha/swapcontext.S
new file mode 100644
index 0000000..5f6615e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/swapcontext.S
@@ -0,0 +1,51 @@
+/* Save current context and install the given one.
+   Copyright (C) 2004 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.  */
+
+#include <sysdep.h>
+#include <ucontext-offsets.h>
+
+ENTRY(__swapcontext)
+
+#ifdef PROF
+	ldgp	$29, 0($27)
+	.set noat
+	lda     AT, _mcount
+	jsr     AT, (AT), _mcount
+	.set at
+	.prologue 1
+#elif defined PIC
+	.prologue 0
+#else
+	ldgp	$29, 0($27)
+	.prologue 1
+#endif
+
+#ifdef PIC
+	unop
+	bsr	$0, __getcontext_x	!samegp
+	mov	$17, $16
+	br	$31, __setcontext	!samegp
+#else
+	jsr	$0, __getcontext_x
+	mov	$17, $16
+	jmp	$31, __setcontext
+#endif
+
+END(__swapcontext)
+weak_alias(__swapcontext, swapcontext)
diff --git a/sysdeps/unix/sysv/linux/alpha/ucontext-offsets.sym b/sysdeps/unix/sysv/linux/alpha/ucontext-offsets.sym
new file mode 100644
index 0000000..f95ff75
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/ucontext-offsets.sym
@@ -0,0 +1,18 @@
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+--
+UC_LINK		offsetof (ucontext_t, uc_link)
+UC_OSF_SIGMASK	offsetof (ucontext_t, __uc_osf_sigmask)
+UC_STACK	offsetof (ucontext_t, uc_stack)
+UC_SIGCTX	offsetof (ucontext_t, uc_mcontext)
+UC_SIGMASK	offsetof (ucontext_t, uc_sigmask)
+SC_REGS		offsetof (struct sigcontext, sc_regs)
+SC_FPREGS	offsetof (struct sigcontext, sc_fpregs)
+SC_PC		offsetof (struct sigcontext, sc_pc)
+SC_PS		offsetof (struct sigcontext, sc_ps)
+SC_FPCRS	offsetof (struct sigcontext, sc_fpcr)
+SC_MASK		offsetof (struct sigcontext, sc_mask)
+SC_FPCR		offsetof (struct sigcontext, sc_fpcr)
+SS_SP		offsetof (stack_t, ss_sp)
+SS_SIZE		offsetof (stack_t, ss_size)