diff options
Diffstat (limited to 'sysdeps/x86_64/____longjmp_chk.S')
| -rw-r--r-- | sysdeps/x86_64/____longjmp_chk.S | 146 |
1 files changed, 1 insertions, 145 deletions
diff --git a/sysdeps/x86_64/____longjmp_chk.S b/sysdeps/x86_64/____longjmp_chk.S index 80e4aff36d..0910861a9d 100644 --- a/sysdeps/x86_64/____longjmp_chk.S +++ b/sysdeps/x86_64/____longjmp_chk.S @@ -1,145 +1 @@ -/* Copyright (C) 2001,2004,2005,2006,2009 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., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <sysdep.h> -#include <jmpbuf-offsets.h> -#include <asm-syntax.h> - - .section .rodata.str1.1,"aMS",@progbits,1 - .type longjmp_msg,@object -longjmp_msg: - .string "longjmp causes uninitialized stack frame" - .size longjmp_msg, .-longjmp_msg - - -//#define __longjmp ____longjmp_chk - -#ifdef PIC -# define CALL_FAIL leaq longjmp_msg(%rip), %rdi; \ - call __GI___fortify_fail -#else -# define CALL_FAIL movq $longjmp_msg, %rdi; \ - call __fortify_fail -#endif - -#define CHECK_RSP(reg) \ - cmpq reg, %rsp; \ - jbe .Lok; \ - CALL_FAIL; \ -.Lok: - -/* Jump to the position specified by ENV, causing the - setjmp call there to return VAL, or 1 if VAL is 0. - void __longjmp (__jmp_buf env, int val). */ - .text -ENTRY(____longjmp_chk) - /* Restore registers. */ - movq (JB_RSP*8)(%rdi),%r8 - movq (JB_RBP*8)(%rdi),%r9 - movq (JB_PC*8)(%rdi),%rdx -#ifdef PTR_DEMANGLE - PTR_DEMANGLE (%r8) - PTR_DEMANGLE (%r9) - PTR_DEMANGLE (%rdx) -#endif - - /* Save function parameters. */ - movq %rdi, %r10 - movl %esi, %ecx - - xorl %eax, %eax - cmpq %r8, %rsp - jbe .Lok - - subq $24, %rsp - cfi_adjust_cfa_offset(24) - xorl %edi, %edi - movq %rsp, %rsi - movl $__NR_sigaltstack, %eax - syscall - testl %eax, %eax - movl $0, %eax - leaq 24(%rsp), %rsp - cfi_adjust_cfa_offset(-24) - jne .Lok - movl 8(%rsp), %eax - andl $1, %eax - -.Lok: - /* We add unwind information for the target here. */ - cfi_def_cfa(%r10, 0) - cfi_register(%rsp,%r8) - cfi_register(%rbp,%r9) - cfi_register(%rip,%rdx) - cfi_offset(%rbx,JB_RBX*8) - cfi_offset(%r12,JB_R12*8) - cfi_offset(%r13,JB_R13*8) - cfi_offset(%r14,JB_R14*8) - cfi_offset(%r15,JB_R15*8) - - xchgq %r8, %rsp - cfi_restore(%rsp) - xchgq %r9, %rbp - cfi_restore(%rbp) - - movq (JB_RBX*8)(%r10),%rbx - movq (JB_R12*8)(%r10),%r12 - movq (JB_R13*8)(%r10),%r13 - movq (JB_R14*8)(%r10),%r14 - movq (JB_R15*8)(%r10),%r15 - - cmpq %rsp, %r8 - jnbe .Lcheck - - /* Set return value for setjmp. */ -.Lout: movl %ecx, %eax - jmpq *%rdx - -.Lcheck: - testl %eax, %eax - je .Lfail - - subq $24, %rsp - cfi_adjust_cfa_offset(24) - xorl %edi, %edi - movq %rsp, %rsi - movl $__NR_sigaltstack, %eax - syscall - addq $24, %rsp - cfi_adjust_cfa_offset(-24) - testl $1, 8(%rsp) - je .Lout - -.Lfail: xchgq %r8, %rsp - /* We want the stack trace to show that of the caller. */ - cfi_def_cfa(%rsp, 8) - cfi_restore(%rsp) - cfi_register(%rbp, %r9) - cfi_restore(%rip) - cfi_restore(%rbx) - cfi_restore(%r12) - cfi_restore(%r13) - cfi_restore(%r14) - cfi_restore(%r15) - - xchgq %r9, %rbp - cfi_restore(%rbp) - - CALL_FAIL - hlt -END (BP_SYM (____longjmp_chk)) +#error "OS-specific version needed" |