alpha: Implement ____longjmp_chk.

Signed-off-by: Richard Henderson <rth@twiddle.net>

2 files changed, 143 insertions, 0 deletions

diff --git a/ChangeLog.alpha b/ChangeLog.alpha
index 47e4aaaf68..ded299ee48 100644
--- a/ChangeLog.alpha
+++ b/ChangeLog.alpha
@@ -1,5 +1,9 @@
 2010-03-26  Richard Henderson  <rth@redhat.com>
 
+	* sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S: New.
+
+2010-03-26  Richard Henderson  <rth@redhat.com>
+
 	* sysdeps/unix/sysv/linux/alpha/Versions: Update errlist-compat
 	for GLIBC_2.12.
 
diff --git a/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S b/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
new file mode 100644
index 0000000000..5194ed818c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
@@ -0,0 +1,139 @@
+/* Copyright (C) 1992, 1994, 1997, 2006, 2010 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 <jmpbuf-offsets.h>
+
+
+	.section .rodata.str1.1,"aMS",@progbits,1
+	.type   longjmp_msg,@object
+longjmp_msg:
+	.string "longjmp causes uninitialized stack frame"
+	.size   longjmp_msg, .-longjmp_msg
+
+
+/* Jump to the position specified by ENV, causing the
+   setjmp call there to return VAL, or 1 if VAL is 0.
+   void __longjmp (__jmp_buf env, int val).  */
+	.text
+	.align	4
+	.globl	____longjmp_chk
+	.type	____longjmp_chk, @function
+	.usepv	____longjmp_chk, std
+
+	cfi_startproc
+____longjmp_chk:
+	ldgp    gp, 0(pv)
+#ifdef PROF
+	.set noat
+	lda     AT, _mcount
+	jsr     AT, (AT), _mcount
+	.set at
+#endif
+
+	ldq     s2, JB_PC*8(a0)
+	mov	a0, s0
+	ldq     fp, JB_FP*8(a0)
+	mov     a1, s1
+	ldq     s3, JB_SP*8(a0)
+	cmoveq  s1, 1, s1
+
+#ifdef PTR_DEMANGLE
+	PTR_DEMANGLE(s2, t1)
+	PTR_DEMANGLE2(s3, t1)
+	PTR_DEMANGLE2(fp, t1)
+#endif
+	cmpule	t0, sp, t1
+	bne	t1, .Lfail
+
+	.align	4
+.Lok:
+	mov	s0, a0
+	mov	s1, v0
+	mov	s3, t0
+	mov	s2, ra
+	cfi_remember_state
+	cfi_def_cfa(a0, 0)
+	cfi_register(sp, t0)
+	cfi_offset(s0, JB_S0*8)
+	cfi_offset(s1, JB_S1*8)
+	cfi_offset(s2, JB_S2*8)
+	cfi_offset(s3, JB_S3*8)
+	cfi_offset(s4, JB_S4*8)
+	cfi_offset(s5, JB_S5*8)
+	cfi_offset(s3, JB_S3*8)
+	cfi_offset($f2, JB_F2*8)
+	cfi_offset($f3, JB_F3*8)
+	cfi_offset($f4, JB_F4*8)
+	cfi_offset($f5, JB_F5*8)
+	cfi_offset($f6, JB_F6*8)
+	cfi_offset($f7, JB_F7*8)
+	cfi_offset($f8, JB_F8*8)
+	cfi_offset($f9, JB_F9*8)
+	ldq	s0, JB_S0*8(a0)
+	ldq	s1, JB_S1*8(a0)
+	ldq	s2, JB_S2*8(a0)
+	ldq	s3, JB_S3*8(a0)
+	ldq	s4, JB_S4*8(a0)
+	ldq	s5, JB_S5*8(a0)
+	ldt     $f2, JB_F2*8(a0)
+	ldt     $f3, JB_F3*8(a0)
+	ldt     $f4, JB_F4*8(a0)
+	ldt     $f5, JB_F5*8(a0)
+	ldt     $f6, JB_F6*8(a0)
+	ldt     $f7, JB_F7*8(a0)
+	ldt     $f8, JB_F8*8(a0)
+	ldt     $f9, JB_F9*8(a0)
+	mov     t0, sp
+	ret
+
+	.align	4
+.Lfail:
+	cfi_restore_state
+	lda	v0, __NR_sigaltstack
+	lda	a0, 0
+	lda	a1, -32(sp)
+	lda	sp, -32(sp)
+	cfi_adjust_cfa_offset(32)
+	callsys
+	ldq	t0, 0(sp)	/* ss_sp */
+	ldl	t1, 8(sp)	/* ss_flags */
+	ldq	t2, 16(sp)	/* ss_size */
+	lda	sp, 32(sp)
+	cfi_adjust_cfa_offset(-32)
+
+	/* Without working sigaltstack we cannot perform the test.  */
+	bne	a3, .Lok
+
+	addq	t0, t2, t0	/* t0 = ss_sp + ss_size */
+	subq	t0, s3, t0	/* t0 = (ss_sp + ss_size) - new_sp */
+	cmpule	t2, t0, t0	/* t0 = (t0 >= ss_size) */
+	and	t0, t1, t0	/* t0 = (t0 >= ss_size) & (ss_flags & SS_ONSTACK) */
+	bne	t0, .Lok
+
+	ldah	a0, longjmp_msg(gp)	!gprelhigh
+	lda	a0, longjmp_msg(a0)	!gprellow
+#ifdef PIC
+	jsr	ra, HIDDEN_JUMPTARGET(__fortify_fail)
+#else
+	bsr	ra, HIDDEN_JUMPTARGET(__fortify_fail)	!samegp
+#endif
+	bugchk
+
+	cfi_endproc
+	.size	____longjmp_chk, .-____longjmp_chk