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From: "Jarek Pelczar" <spideros1 AT wp DOT pl>
Newsgroups: comp.os.msdos.djgpp
Subject: internal compiler error: Segmentation violation
Date: Sat, 27 Sep 2003 00:20:06 +0200
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test.c: In function `flush_thread':
test.c:52: internal compiler error: Segmentation violation
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

/*
test.c ---------------------------------------------------------------------
--------- */
#define NULL ((void *)0)
#define NR_TASKS 512

#define _set_tssldt_desc(n,addr,limit,type) \
__asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
 "movw %w0,%2\n\t" \
 "rorl $16,%0\n\t" \
 "movb %b0,%3\n\t" \
 "movb $" type ",%4\n\t" \
 "movb $0x00,%5\n\t" \
 "movb %h0,%6\n\t" \
 "rorl $16,%0" \
 : /* no output */ \
 :"r" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
  "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
 )

#define set_tss_desc(n,addr) _set_tssldt_desc(((char *)
(n)),((int)(addr)),235,"0x89")
#define set_ldt_desc(n,addr,size) \
 _set_tssldt_desc(((char *) (n)),((int)(addr)),((size << 3) - 1),"0x82")

char default_ldt[8];
struct {
 long a,b;
} gdt[256];

struct {
 char * ldt;
 long debugreg[10];
} * current,* task[NR_TASKS];

#define FIRST_LDT_ENTRY 10

void flush_thread(void)
{
 int i;

 if (current->ldt) {
  free_page((unsigned long) current->ldt);
  current->ldt = NULL;
  for (i=1 ; i<NR_TASKS ; i++) {
   if (task[i] == current)  {
    set_ldt_desc(gdt+(i<<1)+
          FIRST_LDT_ENTRY,&default_ldt, 1);
    load_ldt(i);
   }
  }
 }

 for (i=0 ; i<8 ; i++)
  current->debugreg[i] = 0;
}

/* -------------------------------------------------------------------------
----- */

Compilation flags:
gcc -O2 -fomit-frame-pointer test.c -S

gcc -v dump:

Reading specs from c:/djgpp/lib/gcc-lib/djgpp/3.3/specs
Configured with: /devel/gnu/gcc/3.3/gnu/gcc-3.3/configure
i586-pc-msdosdjgpp --prefix=/dev/env/DJDIR --disable-nls
Thread model: single
gcc version 3.3