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57e5696463
On some systems executable stacks are denied. Since libunwind and the
tests don't actually need executable stacks this patch marks all
assembly files as not needing it.
The original patch comes from frysk:
2007-04-05 Jan Kratochvil <jan.kratochvil@redhat.com>
* src/hppa/getcontext.S, src/hppa/setcontext.S, src/hppa/siglongjmp.S,
src/ia64/Ginstall_cursor.S, src/ia64/Linstall_cursor.S,
src/ia64/dyn_info_list.S, src/ia64/getcontext.S, src/ia64/longjmp.S,
src/ia64/setjmp.S, src/ia64/siglongjmp.S, src/ia64/sigsetjmp.S,
src/ppc64/longjmp.S, src/ppc64/siglongjmp.S, src/x86/longjmp.S,
src/x86/siglongjmp.S, src/x86_64/longjmp.S, src/x86_64/setcontext.S,
src/x86_64/siglongjmp.S: Stack should be non-executable, for SELinux.
I added a couple more markers for new files in current libunwind.
Before this patch you would get the following on selinux enabled
systems without allow_exec_stack: error while loading shared
libraries:
libunwind.so.7: cannot enable executable stack as shared object
requires: Permission denied
After the patch that error disappears and all test results are similar
to the results on systems without executable stack protection.
508 lines
10 KiB
ArmAsm
508 lines
10 KiB
ArmAsm
/* libunwind - a platform-independent unwind library
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Copyright (C) 2004-2005 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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.text
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#define CALL_NEXT_PTR(gp_save_reg, arg0, arg1) \
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ld8 r2 = [arg0], 8;; /* read the next function pointer */ \
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ld8 r3 = [r2], 8;; /* read the function's entry-point */ \
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ld8 r2 = [r2];; /* read the function's gp */ \
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mov b6 = r3; \
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mov gp_save_reg = gp; \
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mov out0 = arg0; \
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mov out1 = arg1; \
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mov gp = r2; \
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br.call.sptk.many rp = b6;; \
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mov gp = gp_save_reg
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#define CALL_NEXT(gp_save_reg) CALL_NEXT_PTR(gp_save_reg, in0, in1)
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#define LOAD_VAL(reg) \
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ld8 reg = [in1], 8;; \
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tbit.nz p15, p0 = reg, 0;; \
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(p15) ld8.s reg = [r0]
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.global flushrs
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.proc flushrs
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flushrs:
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flushrs;;
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br.ret.sptk.many rp
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.endp flushrs
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/* Save r4-r7 into stacked registers, load them up with the
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values passed via the pointer in in1 and then call the
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function passed via the pointer in in0. */
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.global save_static_to_stacked
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.proc save_static_to_stacked
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save_static_to_stacked:
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.prologue
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.regstk 2, 7, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 7, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.spillreg r4, loc2
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mov loc2 = r4
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.spillreg r5, loc3
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mov loc3 = r5
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.spillreg r6, loc4
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mov loc4 = r6
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.spillreg r7, loc5
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mov loc5 = r7
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.body
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LOAD_VAL(r4)
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LOAD_VAL(r5)
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LOAD_VAL(r6)
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LOAD_VAL(r7)
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CALL_NEXT(loc6)
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mov r4 = loc2
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mov r5 = loc3
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mov r6 = loc4
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mov r7 = loc5
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mov ar.pfs = loc0
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mov rp = loc1
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br.ret.sptk.many rp
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.endp save_static_to_stacked
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/* Save f2 to the memory stack, save r4 to f2, then load
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r4 with the value passed via in1 and call the function
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passed via in0. */
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.global save_static_to_fr
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.proc save_static_to_fr
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save_static_to_fr:
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.prologue
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.regstk 2, 3, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 3, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.fframe 16
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.spillpsp f2, 0
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stf.spill [sp] = f2, -16
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.spillreg r4, f2
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setf.sig f2 = r4
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.body
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ld8 r4 = [in1], 8;;
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tbit.nz p6, p0 = r4, 0;;
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(p6) ld8.s r4 = [r0]
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CALL_NEXT(loc2)
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getf.sig r4 = f2 // restore r4
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.restore sp
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add sp = 16, sp;;
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ldf.fill f2 = [sp] // restore r2
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mov ar.pfs = loc0
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mov rp = loc1
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br.ret.sptk.many rp
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.endp save_static_to_fr
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/* If r4 is not a NaT, save b3 to a stacked register and
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then save r4 in b3. The non-NaTness of r4 is saved in
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p1. */
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.global save_static_to_br
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.proc save_static_to_br
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save_static_to_br:
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.prologue
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.regstk 2, 6, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 6, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save pr, loc2
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mov loc2 = pr // save predicates
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.spillreg b3, loc3
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mov loc3 = b3
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tnat.z p1, p2 = r4;;
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.spillreg.p p1, r4, b3
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(p1) mov b3 = r4
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.spillreg.p p2, r4, loc4
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(p2) mov loc4 = r4
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.body
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LOAD_VAL(r4)
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CALL_NEXT(loc5)
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.pred.rel.mutex p1, p2
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(p1) mov r4 = b3 // restore r4
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(p2) mov r4 = loc4
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mov ar.pfs = loc0
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mov rp = loc1
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mov pr = loc2, -1
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mov b3 = loc3 // restore b3
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br.ret.sptk.many rp
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.endp save_static_to_br
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/* Spill r4 into memory and then save r5 in r4. */
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.global save_static_to_mem
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.proc save_static_to_mem
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save_static_to_mem:
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.prologue
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.regstk 2, 4, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 4, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save ar.unat, loc2
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mov loc2 = ar.unat
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.fframe 16
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.spillpsp r4, 0
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st8.spill [sp] = r4, -16
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.spillreg r5, r4
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mov r4 = r5
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.body
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LOAD_VAL(r5)
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CALL_NEXT(loc3)
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mov r5 = r4 // restore r5
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.restore sp
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add sp = 16, sp;;
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ld8.fill r4 = [sp] // restore r4
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mov ar.pfs = loc0
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mov rp = loc1
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mov ar.unat = loc2 // restore ar.unat
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br.ret.sptk.many rp
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.endp save_static_to_mem
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/* Spill r6 into memory and save primary ar.unat in a register. */
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.global save_static_to_mem2
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.proc save_static_to_mem2
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save_static_to_mem2:
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.prologue
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.regstk 2, 5, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 5, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save ar.unat, loc2
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mov loc2 = ar.unat
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.fframe 16
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.spillpsp r6, 0
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st8.spill [sp] = r6, -16;;
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.save @priunat, loc3
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mov loc3 = ar.unat
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mov ar.unat = 0 // trash ar.unat
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.body
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LOAD_VAL(r6)
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CALL_NEXT(loc4)
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mov ar.unat = loc3 // restore primary UNaT
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.restore sp
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add sp = 16, sp;;
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ld8.fill r6 = [sp] // restore r6
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mov ar.pfs = loc0
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mov rp = loc1
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mov ar.unat = loc2 // restore ar.unat
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br.ret.sptk.many rp
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.endp save_static_to_mem2
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/* Spill r6 into memory and save primary ar.unat in memory. */
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.global save_static_to_mem3
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.proc save_static_to_mem3
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save_static_to_mem3:
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.prologue
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.regstk 2, 5, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 5, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save ar.unat, loc2
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mov loc2 = ar.unat
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add r2 = 8, sp
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.fframe 16
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.spillpsp r6, 0
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st8.spill [sp] = r6, -16;;
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mov r3 = ar.unat;;
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.savepsp @priunat, -8
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st8 [r2] = r3
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mov ar.unat = 0 // trash ar.unat
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.body
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LOAD_VAL(r6)
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CALL_NEXT(loc4)
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add r2 = 24, sp;;
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ld8 r3 = [r2];;
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mov ar.unat = r3 // restore primary UNaT
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.restore sp
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add sp = 16, sp;;
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ld8.fill r6 = [sp] // restore r6
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mov ar.pfs = loc0
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mov rp = loc1
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mov ar.unat = loc2 // restore ar.unat
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br.ret.sptk.many rp
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.endp save_static_to_mem3
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/* Spill r6 into memory and save primary ar.unat in register,
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then in memory. */
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.global save_static_to_mem4
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.proc save_static_to_mem4
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save_static_to_mem4:
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.prologue
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.regstk 2, 5, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 5, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save ar.unat, loc2
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mov loc2 = ar.unat
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add r2 = 8, sp
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.fframe 16
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.spillpsp r6, 0
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st8.spill [sp] = r6, -16;;
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.save @priunat, r3
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mov r3 = ar.unat;;
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mov ar.unat = 0 // trash ar.unat
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.savepsp @priunat, -8
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st8 [r2] = r3
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mov r3 = r0 // trash register pri UNaT location
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.body
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LOAD_VAL(r6)
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CALL_NEXT(loc4)
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add r2 = 24, sp;;
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ld8 r3 = [r2];;
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mov ar.unat = r3 // restore primary UNaT
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.restore sp
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add sp = 16, sp;;
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ld8.fill r6 = [sp] // restore r6
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mov ar.pfs = loc0
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mov rp = loc1
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mov ar.unat = loc2 // restore ar.unat
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br.ret.sptk.many rp
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.endp save_static_to_mem4
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/* Spill r6 into memory and save primary ar.unat in register,
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then in memory. */
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.global save_static_to_mem5
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.proc save_static_to_mem5
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save_static_to_mem5:
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.prologue
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.regstk 2, 5, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 5, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save ar.unat, loc2
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mov loc2 = ar.unat
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add r2 = 8, sp
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.fframe 16
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.spillpsp r6, 0
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st8.spill [sp] = r6, -16;;
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mov r3 = ar.unat;;
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mov ar.unat = 0 // trash ar.unat
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.savepsp @priunat, -8
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st8 [r2] = r3
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.save @priunat, loc3
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mov loc3 = r3
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st8 [r2] = r0 // trash memory pri UNaT location
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.body
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LOAD_VAL(r6)
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CALL_NEXT(loc4)
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add r2 = 24, sp;;
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ld8 r3 = [r2];;
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mov ar.unat = loc3 // restore primary UNaT
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.restore sp
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add sp = 16, sp;;
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ld8.fill r6 = [sp] // restore r6
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mov ar.pfs = loc0
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mov rp = loc1
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mov ar.unat = loc2 // restore ar.unat
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br.ret.sptk.many rp
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.endp save_static_to_mem5
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/* Save r4-r7 to various scratch registers, then trigger
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a segfault. */
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.global save_static_to_scratch
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.proc save_static_to_scratch
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save_static_to_scratch:
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.prologue
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.spillreg r4, r16
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mov r16 = r4 // save r4 in r16
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tnat.nz p6, p7 = r5;;
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.spillreg.p p6, r5, f31
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(p6) setf.sig f31 = r5 // save r5 in f31 if it's a NaT
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.spillreg.p p7, r5, b6
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(p7) mov b6 = r5 // in b6 if it not
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.spillreg r6, f32
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setf.sig f32 = r6 // save r6 in f32 (fph partition)
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.spillsp r7, 0
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st8.spill [sp] = r7 // save r7 in the scratch stack space
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.spillreg f4, f6
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mov f6 = f4;;
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.body
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ld8 r2 = [in1]
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;;
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mov ar.ec = r2
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LOAD_VAL(r4)
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LOAD_VAL(r5)
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LOAD_VAL(r6)
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LOAD_VAL(r7)
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setf.sig f4 = r4
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/* Now force a SIGSEGV. Make sure the ld8 is at the beginning of a
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bundle, so the signal-handler can skip over it simply by
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incrementing the IP. */
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{
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.mmi
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ld8 r2 = [r0]
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nop.m 0
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nop.i 0 ;;
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}
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mov f4 = f6
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mov r4 = r16
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.pred.rel.mutex p6, p7
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(p6) getf.sig r5 = f31
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(p7) mov r5 = b6
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getf.sig r6 = f32
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ld8.fill r7 = [sp]
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br.ret.sptk.many rp
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.endp save_static_to_scratch
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/* Rotate registers a bit in a vain attempt to sow some confusion.
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Care must be taken not to write any rotating general register
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after rotation, because we keep the preserved state
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there... */
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.global rotate_regs
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.proc rotate_regs
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rotate_regs:
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.prologue
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.regstk 2, 14, 2, 16
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 14, 2, 16
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.save rp, loc1
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mov loc1 = rp
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.save pr, loc2
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mov loc2 = pr
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.save ar.lc, loc3
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mov loc3 = ar.lc
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.spillreg r4, loc4
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mov loc4 = r4
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ld8 r2 = [in1], 8;;
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mov pr = r2, -1
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ld8 r2 = [in1], 8;;
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mov r8 = in0
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mov r9 = in1
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and r2 = 127, r2;;
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mov ar.ec = 0
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mov ar.lc = r2;;
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// use p6 to preserve p63 as it gets rotated into p16:
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(p16) cmp.eq.unc p6,p0 = r0,r0;;
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1:
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(p6) cmp.eq.unc p16,p0 = r0,r0
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(p63) cmp.eq.unc p6,p0 = r0,r0
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br.ctop.dptk.few 1b;;
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(p6) cmp.eq.unc p63,p0 = r0,r0
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CALL_NEXT_PTR(r4, r8, r9)
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clrrrb
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mov ar.pfs = loc0
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mov rp = loc1
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mov pr = loc2, -1
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mov ar.lc = loc3
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mov r4 = loc4
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br.ret.sptk.many rp
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.endp rotate_regs
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.global save_pr
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.proc save_pr
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save_pr:
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.prologue
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.regstk 2, 4, 2, 0
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.save ar.pfs, loc0
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alloc loc0 = ar.pfs, 2, 4, 2, 0
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.save rp, loc1
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mov loc1 = rp
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.save pr, loc2
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mov loc2 = pr
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ld8 r2 = [in1], 8;;
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mov pr = r2, -1
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CALL_NEXT(loc3)
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mov ar.pfs = loc0
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mov rp = loc1
|
|
mov pr = loc2, -1
|
|
br.ret.sptk.many rp
|
|
|
|
.endp save_pr
|
|
|
|
#ifdef __linux__
|
|
/* We do not need executable stack. */
|
|
.section .note.GNU-stack,"",@progbits
|
|
#endif
|