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glibc/sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S
Roland McGrath 3e7e947f6b * sysdeps/powerpc/powerpc32/fpu/fprsave.S: Add cfi_offset for spilling 
of non-volatile floating-point registers to the stack (fp14-fp31).
	* sysdeps/powerpc/powerpc32/gprsave0.S: Add cfi_offset for spilling of
	non-volatile general-purpose registers to the stack (gpr13-gpr31).
	* sysdeps/powerpc/powerpc64/dl-trampoline.S: Add cfi_offset
	for non-volatiles gpr30 - grp31 spilled to the stack.
	* sysdeps/powerpc/powerpc64/memcpy.S: Add cfi_offset for non-volatile
	gpr31 spill to the stack.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S:
	Add cfi_offset for non-volatile gpr31 spill to the stack.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S: Add cfi_offset
	for non-volatiles gpr28 - grp31 spilled to the stack.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/getcontext.S: Add
	cfi_adjust_cfa_offset when a frame is stacked.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S:
	(__novec_setcontext) : Add cfi_offset for non-volatile gpr31 spill
	add LR saved to the stack.  Add cfi_adjust_cfa_offset when frame is
	stacked.
	(__setcontext) : Add cfi_offset for non-volatile gpr31 spill to
	the stack.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S:
	(__novec_swapcontext) : Add cfi_offset for non-volatile gpr31 spill
	add LR saved to the stack.
	(__swapcontext) : Add cfi_offset for non-volatile gpr31 spill add LR
	saved to the stack.  Add cfi_adjust_cfa_offset when frame is stacked.
2006-03-16 11:49:03 +00:00

470 lines
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/* Switch to context.
Copyright (C) 2002, 2004, 2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston MA
02110-1301 USA. */
#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>
#if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)
ENTRY(__novec_setcontext)
CALL_MCOUNT 1
#ifdef __ASSUME_NEW_RT_SIGRETURN_SYSCALL
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)
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)
mtfsf 0xff,fp0
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)
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
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. */
#else
/* If the kernel is not at least 2.4.21 then generate a ENOSYS stub. */
mflr r0
std r0,FRAME_LR_SAVE(r1)
cfi_offset(lr,FRAME_LR_SAVE)
stdu r1,-128(r1)
cfi_adjust_cfa_offset(128)
li r3,ENOSYS
bl JUMPTARGET(__syscall_error)
nop
li r3,-1
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
blr
#endif
PSEUDO_END(__novec_setcontext)
compat_symbol (libc, __novec_setcontext, setcontext, GLIBC_2_3)
#endif
.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"
.machine "altivec"
ENTRY(__setcontext)
CALL_MCOUNT 1
#ifdef __ASSUME_NEW_RT_SIGRETURN_SYSCALL
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. r5,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)
mtfsf 0xff,fp0
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)
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
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. */
#else
/* If the kernel is not at least 2.4.21 then generate a ENOSYS stub. */
mflr r0
std r0,FRAME_LR_SAVE(r1)
cfi_offset (lr, FRAME_LR_SAVE)
stdu r1,-128(r1)
cfi_adjust_cfa_offset (128)
li r3,ENOSYS
bl JUMPTARGET(__syscall_error)
nop
li r3,-1
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
blr
#endif
PSEUDO_END(__setcontext)
versioned_symbol (libc, __setcontext, setcontext, GLIBC_2_3_4)
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