diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S new file mode 100644 index 0000000000..2955c56a56 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S @@ -0,0 +1,131 @@ +/* Copyright (C) 2001-2017 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) |