| /* Copyright (C) 2001-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <jmpbuf-offsets.h> |
| #include <asm-syntax.h> |
| #include <stap-probe.h> |
| |
| #include <sigaltstack-offsets.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 sub $8, %RSP_LP; \ |
| cfi_remember_state; \ |
| cfi_def_cfa_offset(16); \ |
| lea longjmp_msg(%rip), %RDI_LP; \ |
| call HIDDEN_JUMPTARGET(__fortify_fail); \ |
| nop; \ |
| cfi_restore_state |
| #else |
| # define CALL_FAIL sub $8, %RSP_LP; \ |
| cfi_remember_state; \ |
| cfi_def_cfa_offset(16); \ |
| mov $longjmp_msg, %RDI_LP; \ |
| call HIDDEN_JUMPTARGET(__fortify_fail); \ |
| nop; \ |
| cfi_restore_state |
| #endif |
| |
| /* 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. */ |
| mov (JB_RSP*8)(%rdi), %R8_LP |
| mov (JB_RBP*8)(%rdi),%R9_LP |
| mov (JB_PC*8)(%rdi), %RDX_LP |
| #ifdef PTR_DEMANGLE |
| PTR_DEMANGLE (%R8_LP) |
| PTR_DEMANGLE (%R9_LP) |
| PTR_DEMANGLE (%RDX_LP) |
| # ifdef __ILP32__ |
| /* We ignored the high bits of the %rbp value because only the low |
| bits are mangled. But we cannot presume that %rbp is being used |
| as a pointer and truncate it, so recover the high bits. */ |
| movl (JB_RBP*8 + 4)(%rdi), %eax |
| shlq $32, %rax |
| orq %rax, %r9 |
| # endif |
| #endif |
| |
| cmp %R8_LP, %RSP_LP |
| jbe .Lok |
| |
| /* Save function parameters. */ |
| movq %rdi, %r10 |
| cfi_register (%rdi, %r10) |
| movl %esi, %ebx |
| cfi_register (%rsi, %rbx) |
| |
| xorl %edi, %edi |
| lea -sizeSS(%rsp), %RSI_LP |
| movl $__NR_sigaltstack, %eax |
| syscall |
| /* Without working sigaltstack we cannot perform the test. */ |
| testl %eax, %eax |
| jne .Lok2 |
| testl $1, (-sizeSS + oSS_FLAGS)(%rsp) |
| jz .Lfail |
| |
| mov (-sizeSS + oSS_SP)(%rsp), %RAX_LP |
| add (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP |
| sub %R8_LP, %RAX_LP |
| cmp (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP |
| jae .Lok2 |
| |
| .Lfail: CALL_FAIL |
| |
| .Lok2: movq %r10, %rdi |
| cfi_restore (%rdi) |
| movl %ebx, %esi |
| cfi_restore (%rsi) |
| |
| .Lok: |
| LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP) |
| /* 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 |
| mov %R8_LP, %RSP_LP |
| movq %r9,%rbp |
| LIBC_PROBE (longjmp_target, 3, |
| LP_SIZE@%RDI_LP, -4@%eax, LP_SIZE@%RDX_LP) |
| jmpq *%rdx |
| END (____longjmp_chk) |
