2017-01-01 00:14:16 +00:00
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/* Copyright (C) 2001-2017 Free Software Foundation, Inc.
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2012-05-10 19:47:31 +00:00
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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 <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <asm-syntax.h>
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#include <signal-defines.h>
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/* #include <signal.h> */
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#define SS_ONSTACK 1
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.section .rodata.str1.1,"aMS",@progbits,1
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.type longjmp_msg,@object
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longjmp_msg:
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.string "longjmp causes uninitialized stack frame"
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.size longjmp_msg, .-longjmp_msg
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#ifdef PIC
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# define CALL_FAIL movl %ebx, %ecx; /* TODO: what's this mov good for? */ \
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cfi_register(%ebx,%ecx); \
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LOAD_PIC_REG (bx); \
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leal longjmp_msg@GOTOFF(%ebx), %eax; \
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call HIDDEN_JUMPTARGET(__fortify_fail)
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#else
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# define CALL_FAIL movl $longjmp_msg, %eax; \
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call HIDDEN_JUMPTARGET(__fortify_fail)
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#endif
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.text
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ENTRY (____longjmp_chk)
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movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
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/* Save the return address now. */
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movl (JB_PC*4)(%ecx), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%ecx), %edi
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cfi_undefined(%edi)
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2012-11-04 20:46:30 +00:00
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#ifdef PTR_DEMANGLE
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2012-05-10 19:47:31 +00:00
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%edi)
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2012-11-04 20:46:30 +00:00
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#endif
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2012-05-10 19:47:31 +00:00
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cmpl %edi, %esp
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/* Jumping to a higher-address frame is always allowed. */
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jbe .Lok
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/* Passing here, we're either about to do something invalid, or we're
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executing on an alternative signal stack. */
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/* TODO: need locking? */
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/* struct hurd_sigstate * _hurd_self_sigstate (void) */
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2016-05-29 23:24:09 +00:00
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#ifdef PIC
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call 1f
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1: popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
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#endif
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call JUMPTARGET(_hurd_self_sigstate)
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2012-05-10 19:47:31 +00:00
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/* TODO: %eax and %eax->sigaltstack are always valid? */
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testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%eax)
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/* Fail if SS_ONSTACK is not set. */
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jz .Lfail
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%eax), %ebx
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addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
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subl %edi, %ebx
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cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
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/* TODO: comment this calculation. */
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jae .Lok
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.Lfail: CALL_FAIL
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.Lok: /* We add unwind information for the target here. */
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cfi_def_cfa(%ecx, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %edi)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %edi, %esp
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/* Restore registers. */
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movl (JB_BX*4)(%ecx), %ebx
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movl (JB_SI*4)(%ecx), %esi
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movl (JB_DI*4)(%ecx), %edi
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movl (JB_BP*4)(%ecx), %ebp
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_restore(%edi)
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cfi_restore(%ebp)
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/* Jump to saved PC. */
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jmp *%edx
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END (____longjmp_chk)
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