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[alpha] Fix wrong register use in ____longjmp_chk.

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This commit is contained in:
Richard Henderson 2011-03-28 14:44:49 -07:00
parent 8825867bdd
commit 39262cc898
2 changed files with 19 additions and 7 deletions
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5
ChangeLog.alpha
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@ -1,3 +1,8 @@
2011-03-28 Aurelien Jarno <aurelien@aurel32.net>
* sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S(____longjmp_chk):
Fix wrong register in stack pointer comparison.
2011-03-01 Aurelien Jarno <aurelien@aurel32.net>
* sysdeps/alpha/fpu/feupdateenv.c (feupdateenv): Add libm_hidden_def.

21
sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
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@ -1,4 +1,5 @@
/* Copyright (C) 1992, 1994, 1997, 2006, 2010 Free Software Foundation, Inc.
/* Copyright (C) 1992, 1994, 1997, 2006, 2010, 2011
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
@ -58,11 +59,17 @@ ____longjmp_chk:
PTR_DEMANGLE2(s3, t1)
PTR_DEMANGLE2(fp, t1)
#endif
cmpule t0, sp, t1
bne t1, .Lfail
/* ??? While this is a proper test for detecting a longjmp to an
invalid frame within any given stack, the main thread stack is
located *below* almost everything in the address space. Which
means that the test at Lfail vs the signal stack will almost
certainly never pass. We ought bounds check top and bottom of
the current thread's stack. */
cmpule s3, sp, t1
bne t1, $Lfail
.align 4
.Lok:
$Lok:
mov s0, a0
mov s1, v0
mov s3, t0
@ -103,7 +110,7 @@ ____longjmp_chk:
ret
.align 4
.Lfail:
$Lfail:
cfi_restore_state
lda v0, __NR_sigaltstack
lda a0, 0
@ -118,13 +125,13 @@ ____longjmp_chk:
cfi_adjust_cfa_offset(-32)
/* Without working sigaltstack we cannot perform the test. */
bne a3, .Lok
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
bne t0, $Lok
ldah a0, longjmp_msg(gp) !gprelhigh
lda a0, longjmp_msg(a0) !gprellow