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 | 94 |
1 files changed, 29 insertions, 65 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S index 4e53ea63c9..87c728d03b 100644 --- a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S +++ b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S @@ -58,31 +58,36 @@ ENTRY(____longjmp_chk) PTR_DEMANGLE (%rdx) #endif + cmpq %r8, %rsp + jbe .Lok + /* 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 + leaq -24(%rsp), %rsi movl $__NR_sigaltstack, %eax syscall + /* Without working sigaltstack we cannot perform the test. */ testl %eax, %eax - movl $0, %eax - leaq 24(%rsp), %rsp - cfi_adjust_cfa_offset(-24) - jne .Lok - movl -16(%rsp), %eax - andl $1, %eax + jne .Lok2 + testl $1, -16(%rsp) + jz .Lfail -.Lok: - /* We add unwind information for the target here. */ - cfi_def_cfa(%r10, 0) + 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) @@ -91,55 +96,14 @@ ENTRY(____longjmp_chk) 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 - + 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. */ -.Lout: movl %ecx, %eax + movl %esi, %eax + movq %r8,%rsp + movq %r9,%rbp 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, -16(%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)) |