diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S new file mode 100644 index 0000000000..5e11540fd4 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S @@ -0,0 +1,109 @@ +/* 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 + + cmpq %r8, %rsp + jbe .Lok + + /* Save function parameters. */ + movq %rdi, %r10 + movl %esi, %ecx + + xorl %edi, %edi + leaq -24(%rsp), %rsi + movl $__NR_sigaltstack, %eax + syscall + /* Without working sigaltstack we cannot perform the test. */ + testl %eax, %eax + jne .Lok2 + testl $1, -16(%rsp) + jz .Lfail + + movq -24(%rsp), %rax + addq -8(%rsp), %rax + subq %r8, %rax + cmpq -8(%rsp), %rax + jae .Lok2 + +.Lfail: CALL_FAIL + +.Lok2: movq %r10, %rdi + movl %ecx, %esi + +.Lok: /* We add unwind information for the target here. */ + cfi_def_cfa(%rdi, 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) + movq (JB_RBX*8)(%rdi),%rbx + movq (JB_R12*8)(%rdi),%r12 + movq (JB_R13*8)(%rdi),%r13 + movq (JB_R14*8)(%rdi),%r14 + movq (JB_R15*8)(%rdi),%r15 + /* Set return value for setjmp. */ + movl %esi, %eax + movq %r8,%rsp + movq %r9,%rbp + jmpq *%rdx +END (____longjmp_chk) |