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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103925] New: Missing int3 in
 ix86_output_indirect_function_return
Date: Thu, 06 Jan 2022 02:03:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103925

            Bug ID: 103925
           Summary: Missing int3 in ix86_output_indirect_function_return
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: andrew.cooper3 at citrix dot com, ubizjak at gmail dot =
com
  Target Milestone: ---

[hjl@gnu-tgl-2 tmp]$ cat foo.c
struct _Unwind_Context _Unwind_Resume_or_Rethrow_this_context;

void offset (int);

struct _Unwind_Context {
  void *reg[7];
} _Unwind_Resume_or_Rethrow() {
  struct _Unwind_Context cur_contextcur_context =3D
      _Unwind_Resume_or_Rethrow_this_context;
  offset(0);
  __builtin_eh_return ((long) offset, 0);
}
[hjl@gnu-tgl-2 tmp]$ /usr/gcc-12.0.0-x32/bin/gcc -S -O2 -fcf-protection
-mharden-sls=3Dall foo.c=20
[hjl@gnu-tgl-2 tmp]$ cat foo.s
        .file   "foo.c"
        .text
        .p2align 4
        .globl  _Unwind_Resume_or_Rethrow
        .type   _Unwind_Resume_or_Rethrow, @function
_Unwind_Resume_or_Rethrow:
.LFB0:
        .cfi_startproc
        endbr64
        pushq   %rdx
        .cfi_def_cfa_offset 16
        .cfi_offset 1, -16
        xorl    %edi, %edi
        pushq   %rax
        .cfi_def_cfa_offset 24
        .cfi_offset 0, -24
        subq    $8, %rsp
        .cfi_def_cfa_offset 32
        call    offset
        movl    $offset, %ecx
        movq    $0, 24(%rsp,%rcx)
        movq    8(%rsp), %rax
        movq    16(%rsp), %rdx
        leaq    24(%rsp,%rcx), %rsp
        .cfi_def_cfa_offset 8
        popq    %rcx
        .cfi_register 16, 2
        .cfi_def_cfa_offset 0
        jmp     *%rcx <<<< Missing int3
        .cfi_endproc
.LFE0:
        .size   _Unwind_Resume_or_Rethrow, .-_Unwind_Resume_or_Rethrow
        .globl  _Unwind_Resume_or_Rethrow_this_context
        .bss
        .align 32
        .type   _Unwind_Resume_or_Rethrow_this_context, @object
        .size   _Unwind_Resume_or_Rethrow_this_context, 56
_Unwind_Resume_or_Rethrow_this_context:
        .zero   56
        .ident  "GCC: (GNU) 12.0.0 20211225 (experimental)"
        .section        .note.GNU-stack,"",@progbits
        .section        .note.gnu.property,"a"
        .align 8
        .long   1f - 0f
        .long   4f - 1f
        .long   5
0:
        .string "GNU"
1:
        .align 8
        .long   0xc0000002
        .long   3f - 2f
2:
        .long   0x3
3:
        .align 8
4:
[hjl@gnu-tgl-2 tmp]$=