alpha: Implement ____longjmp_chk.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2010-03-26 13:17:02 -07:00
parent c87187fbb5
commit 05479f36bb
2 changed files with 143 additions and 0 deletions

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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

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/* 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