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glibc/sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S
Ulrich Weigand 5162e7dd96 PowerPC64: Fix incorrect CFI in *context routines 
The context established by "makecontext" has a link register pointing
back to an error path within the makecontext routine.  This is currently
covered by the CFI FDE for makecontext itself, which is simply wrong
for the stack frame *inside* the context.  When trying to unwind (e.g.
doing a backtrace) in a routine inside a context created by makecontext,
this can lead to uninitialized stack slots being accessed, causing the
unwinder to crash in the worst case.

Similarly, during parts of the "setcontext" routine, when the stack
pointer has already been switched to point to the new context, the
address range is still covered by the CFI FDE for setcontext.  When
trying to unwind in that situation (e.g. backtrace from an async
signal handler for profiling), it is again possible that the unwinder
crashes.

Theses are all problems in existing code, but the changes in stack
frame layout appear to make the "worst case" much more likely in
the ELFv2 ABI context.  This causes regressions e.g. in the libgo
testsuite on ELFv2.

This patch fixes this by ending the makecontext/setcontext FDEs
before those problematic parts of the assembler, similar to what
is already done on other platforms.   This fixes the libgo
regression on ELFv2.
2013-12-04 07:41:37 -06:00

497 lines
15 KiB
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/* Switch to context.
Copyright (C) 2002-2013 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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <rtld-global-offsets.h>
#include <shlib-compat.h>
#include <kernel-features.h>
#define __ASSEMBLY__
#include <asm/ptrace.h>
#include "ucontext_i.h"
#include <asm/errno.h>
.section ".toc","aw"
.LC__dl_hwcap:
#ifdef SHARED
.tc _rtld_global_ro[TC],_rtld_global_ro
#else
.tc _dl_hwcap[TC],_dl_hwcap
#endif
.section ".text"
#if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)
ENTRY(__novec_setcontext)
CALL_MCOUNT 1
mflr r0
std r31,-8(1)
cfi_offset(r31,-8)
std r0,FRAME_LR_SAVE(r1)
cfi_offset (lr, FRAME_LR_SAVE)
stdu r1,-128(r1)
cfi_adjust_cfa_offset (128)
mr r31,r3
/*
* If this ucontext refers to the point where we were interrupted
* by a signal, we have to use the rt_sigreturn system call to
* return to the context so we get both LR and CTR restored.
*
* Otherwise, the context we are restoring is either just after
* a procedure call (getcontext/swapcontext) or at the beginning
* of a procedure call (makecontext), so we don't need to restore
* msr and ctr. We don't restore r13 since it will be used as
* the TLS pointer. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
cmpdi r0,0
bne L(nv_do_sigret)
li r5,0
addi r4,r3,UCONTEXT_SIGMASK
li r3,SIG_SETMASK
bl JUMPTARGET(__sigprocmask)
nop
cmpdi r3,0
bne L(nv_error_exit)
# ifdef SHARED
/* Load _rtld-global._dl_hwcap. */
ld r5,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r5)
# else
ld r5,0(r5) /* Load extern _dl_hwcap. */
# endif
lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31)
lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r31)
lfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r31)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
# else
.machine push
.machine "power6"
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r5,PPC_FEATURE_HAS_DFP
beq 5f
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
b 6f
/* Continue to operate on the FPSCR as if it were 32-bits. */
5:
mtfsf 0xff,fp0
6:
.machine pop
# endif /* _ARCH_PWR6 */
lfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r31)
lfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r31)
lfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r31)
lfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r31)
lfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r31)
lfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r31)
lfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r31)
lfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r31)
lfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r31)
lfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r31)
lfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r31)
lfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r31)
lfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r31)
lfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r31)
lfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r31)
lfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r31)
lfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r31)
lfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r31)
lfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r31)
lfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r31)
lfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r31)
lfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r31)
lfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r31)
lfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r31)
lfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r31)
lfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r31)
lfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r31)
lfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r31)
lfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r31)
lfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r31)
/* End FDE now, because the unwind info would be wrong while
we're reloading registers to switch to the new context. */
cfi_endproc
ld r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r31)
ld r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r31)
mtlr r0
ld r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r31)
ld r3,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r31)
mtxer r0
ld r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r31)
ld r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r31)
mtcr r0
ld r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r31)
ld r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r31)
ld r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r31)
ld r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r31)
ld r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r31)
ld r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r31)
ld r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r31)
/* Don't reload the thread ID or TLS pointer (r13). */
ld r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r31)
ld r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r31)
ld r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r31)
ld r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r31)
ld r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r31)
ld r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r31)
ld r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r31)
ld r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r31)
ld r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r31)
ld r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r31)
ld r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r31)
ld r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r31)
ld r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r31)
ld r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r31)
ld r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r31)
ld r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r31)
ld r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r31)
/* Now we branch to the "Next Instruction Pointer" from the saved
context. With the powerpc64 instruction set there is no good way to
do this (from user state) without clobbering either the LR or CTR.
The makecontext and swapcontext functions depend on the callers
LR being preserved so we use the CTR. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r31)
mtctr r0
ld r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r31)
ld r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r31)
bctr
/* Re-establish FDE for the rest of the actual setcontext routine. */
cfi_startproc
cfi_offset (lr, FRAME_LR_SAVE)
cfi_adjust_cfa_offset (128)
L(nv_error_exit):
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
ld r31,-8(r1)
blr
/* At this point we assume that the ucontext was created by a
rt_signal and we should use rt_sigreturn to restore the original
state. As of the 2.4.21 kernel the ucontext is the first thing
(offset 0) in the rt_signal frame and rt_sigreturn expects the
ucontext address in R1. Normally the rt-signal trampoline handles
this by popping dummy frame before the rt_signal syscall. In our
case the stack may not be in its original (signal handler return with
R1 pointing at the dummy frame) state. We do have the ucontext
address in R3, so simply copy R3 to R1 before the syscall. */
L(nv_do_sigret):
mr r1,r3,
li r0,SYS_ify(rt_sigreturn)
sc
/* No return. */
PSEUDO_END(__novec_setcontext)
compat_symbol (libc, __novec_setcontext, setcontext, GLIBC_2_3)
#endif
.section ".text"
.machine "altivec"
ENTRY(__setcontext)
CALL_MCOUNT 1
mflr r0
std r31,-8(1)
cfi_offset(r31,-8)
std r0,FRAME_LR_SAVE(r1)
cfi_offset (lr, FRAME_LR_SAVE)
stdu r1,-128(r1)
cfi_adjust_cfa_offset (128)
mr r31,r3
/*
* If this ucontext refers to the point where we were interrupted
* by a signal, we have to use the rt_sigreturn system call to
* return to the context so we get both LR and CTR restored.
*
* Otherwise, the context we are restoring is either just after
* a procedure call (getcontext/swapcontext) or at the beginning
* of a procedure call (makecontext), so we don't need to restore
* msr and ctr. We don't restore r13 since it will be used as
* the TLS pointer. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
cmpdi r0,0
bne L(do_sigret)
li r5,0
addi r4,r3,UCONTEXT_SIGMASK
li r3,SIG_SETMASK
bl JUMPTARGET(__sigprocmask)
nop
cmpdi r3,0
bne L(error_exit)
ld r5,.LC__dl_hwcap@toc(r2)
ld r10,(SIGCONTEXT_V_REGS_PTR)(r31)
# ifdef SHARED
/* Load _rtld-global._dl_hwcap. */
ld r5,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r5)
# else
ld r5,0(r5) /* Load extern _dl_hwcap. */
# endif
andis. r6,r5,(PPC_FEATURE_HAS_ALTIVEC >> 16)
beq L(has_no_vec)
cmpdi r10,0
beq L(has_no_vec)
lwz r0,(33*16)(r10)
li r9,(16*32)
mtspr VRSAVE,r0
cmpwi r0,0
beq L(has_no_vec)
lvx v19,r9,r10
la r9,(16)(r10)
lvx v0,0,r10
lvx v1,0,r9
addi r10,r10,32
addi r9,r9,32
mtvscr v19
lvx v2,0,r10
lvx v3,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v4,0,r10
lvx v5,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v6,0,r10
lvx v7,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v8,0,r10
lvx v9,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v10,0,r10
lvx v11,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v12,0,r10
lvx v13,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v14,0,r10
lvx v15,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v16,0,r10
lvx v17,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v18,0,r10
lvx v19,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v20,0,r10
lvx v21,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v22,0,r10
lvx v23,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v24,0,r10
lvx v25,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v26,0,r10
lvx v27,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v28,0,r10
lvx v29,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v30,0,r10
lvx v31,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v10,0,r10
lvx v11,0,r9
addi r10,r10,32
addi r9,r9,32
L(has_no_vec):
lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31)
lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r31)
lfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r31)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
# else
.machine push
.machine "power6"
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r5,PPC_FEATURE_HAS_DFP
beq 7f
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
b 8f
/* Continue to operate on the FPSCR as if it were 32-bits. */
7:
mtfsf 0xff,fp0
8:
.machine pop
# endif /* _ARCH_PWR6 */
lfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r31)
lfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r31)
lfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r31)
lfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r31)
lfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r31)
lfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r31)
lfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r31)
lfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r31)
lfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r31)
lfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r31)
lfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r31)
lfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r31)
lfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r31)
lfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r31)
lfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r31)
lfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r31)
lfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r31)
lfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r31)
lfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r31)
lfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r31)
lfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r31)
lfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r31)
lfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r31)
lfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r31)
lfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r31)
lfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r31)
lfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r31)
lfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r31)
lfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r31)
lfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r31)
/* End FDE now, because the unwind info would be wrong while
we're reloading registers to switch to the new context. */
cfi_endproc
ld r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r31)
ld r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r31)
mtlr r0
ld r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r31)
ld r3,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r31)
mtxer r0
ld r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r31)
ld r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r31)
ld r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r31)
ld r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r31)
ld r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r31)
ld r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r31)
mtcr r0
ld r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r31)
ld r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r31)
ld r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r31)
/* Don't reload the thread ID or TLS pointer (r13). */
ld r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r31)
ld r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r31)
ld r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r31)
ld r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r31)
ld r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r31)
ld r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r31)
ld r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r31)
ld r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r31)
ld r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r31)
ld r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r31)
ld r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r31)
ld r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r31)
ld r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r31)
ld r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r31)
ld r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r31)
ld r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r31)
ld r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r31)
/* Now we branch to the "Next Instruction Pointer" from the saved
context. With the powerpc64 instruction set there is no good way to
do this (from user state) without clobbering either the LR or CTR.
The makecontext and swapcontext functions depend on the callers
LR being preserved so we use the CTR. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r31)
mtctr r0
ld r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r31)
ld r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r31)
bctr
/* Re-establish FDE for the rest of the actual setcontext routine. */
cfi_startproc
cfi_offset (lr, FRAME_LR_SAVE)
cfi_adjust_cfa_offset (128)
L(error_exit):
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
ld r31,-8(r1)
blr
/* At this point we assume that the ucontext was created by a
rt_signal and we should use rt_sigreturn to restore the original
state. As of the 2.4.21 kernel the ucontext is the first thing
(offset 0) in the rt_signal frame and rt_sigreturn expects the
ucontext address in R1. Normally the rt-signal trampoline handles
this by popping dummy frame before the rt_signal syscall. In our
case the stack may not be in its original (signal handler return with
R1 pointing at the dummy frame) state. We do have the ucontext
address in R3, so simply copy R3 to R1 before the syscall. */
L(do_sigret):
mr r1,r3,
li r0,SYS_ify(rt_sigreturn)
sc
/* No return. */
PSEUDO_END(__setcontext)
versioned_symbol (libc, __setcontext, setcontext, GLIBC_2_3_4)
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