b7f2d27dbd
Add support for pointer encryption in glibc internal structures in C and assembler code. Pointer encryption is a glibc security feature described here: https://sourceware.org/glibc/wiki/PointerEncryption The ARM implementation uses global variables instead of thread pointer relative accesses to get the value of the pointer encryption guard because accessing the thread pointer can be very expensive on older ARM cores. ports/ChangeLog.arm: 2013-10-03 Will Newton <will.newton@linaro.org> * sysdeps/arm/__longjmp.S (__longjmp): Demangle fp, sp and lr when restoring register values. * sysdeps/arm/include/bits/setjmp.h (JMP_BUF_REGLIST): Remove sp and lr from list and replace fp with a4. * sysdeps/arm/jmpbuf-unwind.h (_jmpbuf_sp): New function. (_JMPBUF_UNWINDS_ADJ): Call _jmpbuf_sp. * sysdeps/arm/setjmp.S (__sigsetjmp): Mangle fp, sp and lr before storing register values. * sysdeps/arm/sysdep.h (LDST_GLOBAL): New macro. * sysdeps/unix/sysv/linux/arm/sysdep.h (PTR_MANGLE): New macro. (PTR_DEMANGLE): Likewise. (PTR_MANGLE2): Likewise. (PTR_DEMANGLE2): Likewise.
143 lines
3.2 KiB
ArmAsm
143 lines
3.2 KiB
ArmAsm
/* longjmp for ARM.
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Copyright (C) 1997-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* ??? Needs more rearrangement for the LDM to handle thumb mode. */
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#define NO_THUMB
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#include <sysdep.h>
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#include <bits/setjmp.h>
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#include <rtld-global-offsets.h>
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#include <arm-features.h>
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/* __longjmp(jmpbuf, val) */
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ENTRY (__longjmp)
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mov ip, r0
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movs r0, r1 /* get the return value in place */
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moveq r0, #1 /* can't let setjmp() return zero! */
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#ifdef CHECK_SP
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sfi_breg ip, \
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ldr r4, [\B, #32] /* jmpbuf's sp */
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cfi_undefined (r4)
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (r4, r4, a3, a4)
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#endif
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CHECK_SP (r4)
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#endif
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sfi_sp sfi_breg ip, \
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ldmia \B!, JMP_BUF_REGLIST
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (fp, a4, a3, a2)
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ldr a4, [ip], #4
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PTR_DEMANGLE2 (sp, a4, a3)
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ldr a4, [ip], #4
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PTR_DEMANGLE2 (lr, a4, a3)
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#else
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mov fp, a4
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ldr sp, [ip], #4
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ldr lr, [ip], #4
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#endif
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cfi_restore (v1)
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cfi_restore (v2)
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cfi_restore (v3)
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cfi_restore (v4)
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cfi_restore (v5)
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cfi_restore (v6)
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cfi_restore (sl)
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cfi_restore (fp)
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cfi_restore (sp)
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cfi_restore (lr)
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#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
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# define NEED_HWCAP 1
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#endif
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#ifdef NEED_HWCAP
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# ifdef IS_IN_rtld
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ldr a2, 1f
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ldr a3, .Lrtld_local_ro
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0: add a2, pc, a2
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add a2, a2, a3
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ldr a2, [a2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
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# else
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# ifdef PIC
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ldr a2, 1f
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ldr a3, .Lrtld_global_ro
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0: add a2, pc, a2
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ldr a2, [a2, a3]
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ldr a2, [a2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
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# else
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ldr a2, .Lhwcap
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ldr a2, [a2, #0]
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# endif
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# endif
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#endif
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#ifdef __SOFTFP__
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tst a2, #HWCAP_ARM_VFP
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beq .Lno_vfp
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#endif
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/* Restore the VFP registers. */
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/* Following instruction is vldmia ip!, {d8-d15}. */
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sfi_breg r12, \
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ldc p11, cr8, [\B], #64
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.Lno_vfp:
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#ifndef ARM_ASSUME_NO_IWMMXT
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tst a2, #HWCAP_ARM_IWMMXT
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beq .Lno_iwmmxt
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/* Restore the call-preserved iWMMXt registers. */
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/* Following instructions are wldrd wr10, [ip], #8 (etc.) */
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sfi_breg r12, \
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ldcl p1, cr10, [\B], #8
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sfi_breg r12, \
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ldcl p1, cr11, [\B], #8
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sfi_breg r12, \
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ldcl p1, cr12, [\B], #8
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sfi_breg r12, \
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ldcl p1, cr13, [\B], #8
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sfi_breg r12, \
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ldcl p1, cr14, [\B], #8
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sfi_breg r12, \
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ldcl p1, cr15, [\B], #8
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.Lno_iwmmxt:
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#endif
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DO_RET(lr)
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#ifdef NEED_HWCAP
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# ifdef IS_IN_rtld
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_local_ro:
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.long C_SYMBOL_NAME(_rtld_local_ro)(GOTOFF)
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# else
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# ifdef PIC
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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# else
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.Lhwcap:
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.long C_SYMBOL_NAME(_dl_hwcap)
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# endif
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# endif
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#endif
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END (__longjmp)
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