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List:       gcc-bugs
Subject:    [Bug c/103015] New: [i386][solaris] Segmentation fault loading pointer to TLS
From:       ibuclaw at gdcproject dot org via Gcc-bugs <gcc-bugs () gcc ! gnu ! org>
Date:       2021-10-31 14:30:32
Message-ID: bug-103015-4 () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103015

            Bug ID: 103015
           Summary: [i386][solaris] Segmentation fault loading pointer to
                    TLS
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

Translation of D test gdc.test/runnable/testv.d that segfaults when compiled
with -O2, and linking libraries in dynamically.

---
// Compiled with -m32 -O2
int printf(const char*, ...);

_Thread_local int a1[2] = {5,6};
_Thread_local int a2[3] = {5,6,7};
_Thread_local int a3[4] = {5,6,7,8};

int sum3(int* xx, int length)
{
    int s = 0;
    for (int i = 0; i < length; i++)
    {
        int x = xx[i];
        s += x;
    }
    return s;
}

int main()
{
    printf("%d\n", sum3(a3, sizeof(a3) / sizeof(a3[0])));
    return 0;
}
---

---
Dump of assembler code for function main:
   0x08050c60 <+0>:     lea    0x4(%esp),%ecx
   0x08050c64 <+4>:     and    $0xfffffff0,%esp
   0x08050c67 <+7>:     pushl  -0x4(%ecx)
   0x08050c6a <+10>:    push   %ebp
   0x08050c6b <+11>:    mov    %esp,%ebp
   0x08050c6d <+13>:    push   %ecx
   0x08050c6e <+14>:    sub    $0xc,%esp
   0x08050c71 <+17>:    mov    %gs:0x0,%eax
   0x08050c77 <+23>:    lea    -0x4(%esp),%esp
=> 0x08050c7b <+27>:    movdqa -0x28(%eax),%xmm0
   0x08050c83 <+35>:    movdqa %xmm0,%xmm1
   0x08050c87 <+39>:    psrldq $0x8,%xmm1
   0x08050c8c <+44>:    paddd  %xmm1,%xmm0
   0x08050c90 <+48>:    movdqa %xmm0,%xmm1
   0x08050c94 <+52>:    psrldq $0x4,%xmm1
   0x08050c99 <+57>:    paddd  %xmm1,%xmm0
   0x08050c9d <+61>:    movd   %xmm0,(%esp)
   0x08050ca2 <+66>:    push   $0x80509f8
   0x08050ca7 <+71>:    call   0x8050a4c <printf@plt>
   0x08050cac <+76>:    mov    -0x4(%ebp),%ecx
   0x08050caf <+79>:    add    $0x10,%esp
   0x08050cb2 <+82>:    xor    %eax,%eax
   0x08050cb4 <+84>:    leave  
   0x08050cb5 <+85>:    lea    -0x4(%ecx),%esp
   0x08050cb8 <+88>:    ret    
End of assembler dump.
---=
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