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b50f8e42ba
If longjmp restores the stack frame to an address which is beyond the stack frame at the time of the longjmp call it would install an uninitialized stack frame. If compiled with _FORTIFY_SOURCE defined, longjmp will now bail out in this situation.
88 lines
2.5 KiB
ArmAsm
88 lines
2.5 KiB
ArmAsm
/* longjmp for i386.
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Copyright (C) 1995-1998,2000,2002,2005,2006,2009
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 <bp-sym.h>
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#include <bp-asm.h>
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#define PARMS LINKAGE /* no space for saved regs */
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#define JBUF PARMS
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#define VAL JBUF+PTR_SIZE
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ENTRY (BP_SYM (__longjmp))
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ENTER
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#ifdef PTR_DEMANGLE
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movl JBUF(%esp), %eax /* User's jmp_buf in %eax. */
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CHECK_BOUNDS_BOTH_WIDE (%eax, JBUF(%esp), $JB_SIZE)
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/* Save the return address now. */
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movl (JB_PC*4)(%eax), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%eax), %ecx
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%ecx)
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# ifdef CHECK_ESP
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CHECK_ESP (%ecx)
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# endif
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cfi_def_cfa(%eax, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %ecx)
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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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/* Restore registers. */
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movl (JB_BX*4)(%eax), %ebx
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movl (JB_SI*4)(%eax), %esi
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movl (JB_DI*4)(%eax), %edi
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movl (JB_BP*4)(%eax), %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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movl VAL(%esp), %eax /* Second argument is return value. */
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movl %ecx, %esp
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#else
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movl JBUF(%esp), %ecx /* User's jmp_buf in %ecx. */
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CHECK_BOUNDS_BOTH_WIDE (%ecx, JBUF(%esp), $JB_SIZE)
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# ifdef CHECK_ESP
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movl (JB_SP*4)(%ecx), %eax
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CHECK_ESP (%eax)
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# endif
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movl VAL(%esp), %eax /* Second argument is return value. */
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/* Save the return address now. */
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movl (JB_PC*4)(%ecx), %edx
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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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movl (JB_SP*4)(%ecx), %esp
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#endif
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/* Jump to saved PC. */
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jmp *%edx
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END (BP_SYM (__longjmp))
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