[Bug gas/22553] .largecomm, .lbss, .ldata, and .lrodata are still not documented after many, many years

[john at buu dot ac.th]

https://sourceware.org/bugzilla/show_bug.cgi?id=22553

--- Comment #3 from john at buu dot ac.th ---
This generates .lbss and .ldata - I'll try and find the code that generated
.lrodata
and send that in a different email.

/*
   $gcc -v  
   Using built-in specs.
   COLLECT_GCC=gcc
   COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
   OFFLOAD_TARGET_NAMES=nvptx-none
   OFFLOAD_TARGET_DEFAULT=1
   Target: x86_64-linux-gnu
   Configured with: ../src/configure -v \
     --with-pkgversion='Ubuntu 7.2.0-8ubuntu3' \
     --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs \
     --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ \
     --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 \
     --program-prefix=x86_64-linux-gnu- --enable-shared \
     --enable-linker-build-id --libexecdir=/usr/lib \
     --without-included-gettext --enable-threads=posix \
     --libdir=/usr/lib --enable-nls --with-sysroot=/ \
     --enable-clocale=gnu --enable-libstdcxx-debug \
     --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new \
     --enable-gnu-unique-object --disable-vtable-verify \
     --enable-libmpx --enable-plugin --enable-default-pie \
     --with-system-zlib --with-target-system-zlib \
     --enable-objc-gc=auto --enable-multiarch --disable-werror \
     --with-arch-32=i686 --with-abi=m64 \
     --with-multilib-list=m32,m64,mx32 --enable-multilib \
     --with-tune=generic --enable-offload-targets=nvptx-none \
     --without-cuda-driver --enable-checking=release \
     --build=x86_64-linux-gnu --host=x86_64-linux-gnu \
     --target=x86_64-linux-gnu
   Thread model: posix
   gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
   $gcc -O0 -mcmodel=medium -S ouch.c -o ouch.s
 */ 
#include <stdlib.h>
#define THECOUNT 79999
extern unsigned long int curslot;
extern char *bigarray[THECOUNT];
extern unsigned long int curslot3;
extern char *bigarray3[THECOUNT];

unsigned long int mryo(const char *s);

unsigned long int curslot=0UL;
char *bigarray[THECOUNT];
static unsigned long int curslot2=0UL;
static char *bigarray2[THECOUNT];
unsigned long int curslot3=0UL;
char *bigarray3[THECOUNT]={"Hi",};

unsigned long int mryo(const char *s) {
  unsigned long int len;
  char *t=(char *)s, *u, *v, *w;
  if (!t)
    return 0UL;
  while (*t++)
    ;
  len=t-s;
  t=(char *)s;
  bigarray[curslot]=(char *)malloc(sizeof(char)*len);
  bigarray2[curslot2]=(char *)malloc(sizeof(char)*len);
  u=bigarray[curslot];
  v=bigarray2[curslot2];
  w=bigarray3[curslot3];
  while ((*u++=*t)) {
    *v++=*t;
    *w++=*t++;
  }
  ++curslot;
  ++curslot2;
  ++curslot3;
  return len;
}
/*
    .file   "ouch.c"
    .globl  curslot
    .bss
    .align 8
    .type   curslot, @object
    .size   curslot, 8
curslot:
    .zero   8
    .section    .lbss,"aw",@nobits
    .largecomm  bigarray,639992,32
    .local  curslot2
    .comm   curslot2,8,8
    .local  bigarray2
    .comm   bigarray2,639992,32
    .globl  curslot3
    .bss
    .align 8
    .type   curslot3, @object
    .size   curslot3, 8
curslot3:
    .zero   8
    .globl  bigarray3
    .section    .rodata
.LC0:
    .string "Hi"
    .section    .ldata.rel.local,"aw",@progbits
    .align 32
    .type   bigarray3, @object
    .size   bigarray3, 639992
bigarray3:
    .quad   .LC0
    .zero   639984
    .text
    .globl  mryo
    .type   mryo, @function
mryo:
.LFB5:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    pushq   %r12
    pushq   %rbx
    subq    $64, %rsp
    .cfi_offset 12, -24
    .cfi_offset 3, -32
    leaq    _GLOBAL_OFFSET_TABLE_(%rip), %rbx
    movq    %rdi, -72(%rbp)
    movq    -72(%rbp), %rax
    movq    %rax, -56(%rbp)
    cmpq    $0, -56(%rbp)
    jne .L7
    movl    $0, %eax
    jmp .L3
.L7:
    nop
.L4:
    movq    -56(%rbp), %rax
    leaq    1(%rax), %rdx
    movq    %rdx, -56(%rbp)
    movzbl  (%rax), %eax
    testb   %al, %al
    jne .L4
    movq    -56(%rbp), %rdx
    movq    -72(%rbp), %rax
    subq    %rax, %rdx
    movq    %rdx, %rax
    movq    %rax, -24(%rbp)
    movq    -72(%rbp), %rax
    movq    %rax, -56(%rbp)
    movq    curslot(%rip), %r12
    movq    -24(%rbp), %rax
    movq    %rax, %rdi
    call    address@hidden
    movq    %rax, %rdx
    movabsq address@hidden, %rax
    addq    %rbx, %rax
    movq    %rdx, (%rax,%r12,8)
    movq    curslot2(%rip), %r12
    movq    -24(%rbp), %rax
    movq    %rax, %rdi
    call    address@hidden
    movq    %rax, %rdx
    movabsq address@hidden, %rax
    addq    %rbx, %rax
    movq    %rdx, (%rax,%r12,8)
    movq    curslot(%rip), %rax
    movabsq address@hidden, %rdx
    addq    %rbx, %rdx
    movq    (%rdx,%rax,8), %rax
    movq    %rax, -48(%rbp)
    movq    curslot2(%rip), %rax
    movabsq address@hidden, %rdx
    addq    %rbx, %rdx
    movq    (%rdx,%rax,8), %rax
    movq    %rax, -40(%rbp)
    movq    curslot3(%rip), %rax
    movabsq address@hidden, %rdx
    addq    %rbx, %rdx
    movq    (%rdx,%rax,8), %rax
    movq    %rax, -32(%rbp)
    jmp .L5 
.L6:
    movq    -40(%rbp), %rax
    leaq    1(%rax), %rdx
    movq    %rdx, -40(%rbp)
    movq    -56(%rbp), %rdx
    movzbl  (%rdx), %edx
    movb    %dl, (%rax)
    movq    -56(%rbp), %rdx
    leaq    1(%rdx), %rax
    movq    %rax, -56(%rbp)
    movq    -32(%rbp), %rax
    leaq    1(%rax), %rcx
    movq    %rcx, -32(%rbp)
    movzbl  (%rdx), %edx
    movb    %dl, (%rax)
.L5:
    movq    -48(%rbp), %rax
    leaq    1(%rax), %rdx
    movq    %rdx, -48(%rbp)
    movq    -56(%rbp), %rdx
    movzbl  (%rdx), %edx
    movb    %dl, (%rax)
    movzbl  (%rax), %eax
    testb   %al, %al
    jne .L6
    movq    curslot(%rip), %rax
    addq    $1, %rax
    movq    %rax, curslot(%rip)
    movq    curslot2(%rip), %rax
    addq    $1, %rax
    movq    %rax, curslot2(%rip)
    movq    curslot3(%rip), %rax
    addq    $1, %rax
    movq    %rax, curslot3(%rip)
    movq    -24(%rbp), %rax
.L3:
    addq    $64, %rsp
    popq    %rbx
    popq    %r12
    popq    %rbp
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE5:
    .size   mryo, .-mryo
    .ident  "GCC: (Ubuntu 7.2.0-8ubuntu3) 7.2.0"
    .section    .note.GNU-stack,"",@progbits
*/

________________________________________
From: nickc at redhat dot com address@hidden
Sent: Thursday, January 4, 2018 10:33 PM
To: John Gatewood Ham
Subject: [Bug gas/22553] .largecomm, .lbss, .ldata, and .lrodata are still not
documented after many, many years

https://sourceware.org/bugzilla/show_bug.cgi?id=22553

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2018-01-04
                 CC|                            |nickc at redhat dot com
     Ever confirmed|0                           |1

--- Comment #2 from Nick Clifton <nickc at redhat dot com> ---
Hi John,

  I have posted a potential patch here:

https://sourceware.org/ml/binutils/2018-01/msg00027.html

  This only addresses the .largecomm pseudo-op however.  I am not sure that
  .ldata, .lbss, .lrodata are actual assembler pseudo-ops.  They are section
  names, so they can appear in assembler output from the compiler as part of
  a ".section ..." directive.  But they should not appear on their own as
  directives.  Can you provide an example of how gcc generates them ?

Cheers
  Nick

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