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89 lines
2.9 KiB
ArmAsm
89 lines
2.9 KiB
ArmAsm
/* Copyright (C) 2009-2015 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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#include <sigaltstack-offsets.h>
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.section .rodata.str1.8,"aMS",@progbits,1
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.align 8
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.LC0:
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.string "longjmp causes uninitialized stack frame"
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.section .sdata,"aws",@progbits
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.align 8
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.type longjmp_msg,@object
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longjmp_msg:
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data8 .LC0
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.size longjmp_msg, .-longjmp_msg
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#define __longjmp ____longjmp_chk
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/* We use 32 bytes (rather than sizeof(stack_t)) so that we keep the stack
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properly aligned. But we still want a sanity check to make sure 32 is
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actually enough. */
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#define STACK_SPACE ((sizeSS + 31) & -32)
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/* Check the stack pointer held in the jumpbuf. Make sure it's in either the
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current stack (r12) or in the signal stack. */
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#define CHECK_RSP \
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ld8 loc0 = [in0]; \
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;; \
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/* First see if target stack is within current one. */ \
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cmp.ltu p0, p8 = loc0, r12; \
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(p8) br.cond.dptk.many .Lok; \
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\
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/* Check if it's an alternative signal stack. */ \
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mov out0 = r0; \
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add out1 = -STACK_SPACE, r12; \
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;; \
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mov r12 = out1; \
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DO_CALL_VIA_BREAK (SYS_ify (sigaltstack)); \
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;; \
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/* If the syscall failed, then assume it's OK. */ \
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cmp.eq p8, p0 = -1, r10; \
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(p8) br.cond.spnt .Lok; \
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/* Move stack_t into regs. */ \
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add r14 = oSS_FLAGS, r12; /* ss_flags */ \
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add r15 = oSS_SIZE, r12; /* ss_size */ \
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ld8 r16 = [r12]; /* ss_sp */ \
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;; \
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ld4 r17 = [r14]; /* ss_flags */ \
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ld8 r18 = [r15]; /* ss_size */ \
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;; \
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sub r19 = r16, r18; /* sp - size */ \
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/* See if we're currently on the altstack. */ \
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tbit.nz p0, p8 = r17, 0; /* SS_ONSTACK */ \
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(p8) br.cond.spnt .Lfail; \
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/* Verify target is within alternative stack. */ \
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cmp.gtu p7, p0 = loc0, r16; \
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(p7) br.cond.spnt .Lfail; \
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;; \
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cmp.ltu p0, p8 = loc0, r19; \
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(p8) br.cond.sptk.many .Lok; \
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;; \
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\
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/* Still here? Abort! */ \
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.Lfail: \
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add r12 = STACK_SPACE, r12; \
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addl loc0 = @ltoffx(longjmp_msg#), r1;; \
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ld8.mov loc0 = [loc0], longjmp_msg#;; \
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ld8 out0 = [loc0]; \
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br.call.sptk.many b0 = HIDDEN_JUMPTARGET(__fortify_fail)#;; \
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.Lok: \
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add r12 = STACK_SPACE, r12;
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#include "__longjmp.S"
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