| /* Copyright (C) 2001,2004,2005,2006,2009,2010 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 |
| cfi_register (%rdi, %r10) |
| movl %esi, %ebx |
| cfi_register (%rsi, %rbx) |
| |
| 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 |
| cfi_restore (%rdi) |
| movl %ebx, %esi |
| cfi_restore (%rsi) |
| |
| .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) |
