Date: Mon, 1 Jun 92 09:01:42 EDT
From: DJ Delorie <dj AT ctron DOT com>
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: patches to 1.06
Status: O

Attached are a number of bugfix patches for 1.06.  These will be
official in 1.07, but I thought they would be needed for a lot of
folks right away.  Binaries will not be distributed until 1.07 is
released.

DJ
dj AT ctron DOT com


Problem: go32 doesn't accept the long command line convention of the
GNUish utilities.  This makes in incompatible with GNUish make.

Solution: Change go32 so that it will use _argc, _argv* iff there are
no command line parameters.  This will fix all djgpp compiled programs
at once.

diff -c2 1.06/control.c 1.07/control.c
*** 1.06/control.c	Mon Jun  1 11:12:24 1992
--- 1.07/control.c	Mon Jun  1 11:12:20 1992
***************
*** 200,203 ****
--- 200,229 ----
  }
  
+ static getlongargs(int *ac, char ***av)
+ {
+   char *_argcs = getenv("_argc");
+   int _argc, i;
+   char tmp[10];
+   char **_argv;
+ 
+   if (_argcs == 0)
+     return;
+   if (*ac > 1)
+     return;
+ 
+   _argc = atoi(_argcs);
+   _argv = (char **)malloc((_argc+1)*sizeof(char*));
+   for (i = 1; i<_argc; i++)
+   {
+     sprintf(tmp, "_argv%d", i);
+     _argv[i] = getenv(tmp);
+   }
+   _argv[0] = (*av)[0];
+   _argv[i] = 0;
+   *av = _argv;
+   *ac = _argc;
+   putenv("_argc=");
+ }
+ 
  main(int argc, char **argv, char **envp)
  {
***************
*** 238,241 ****
--- 264,269 ----
      }
    }
+ 
+   getlongargs(&argc, &argv);
  
    ems_handle = emm_present();


Problem: Using -pg to profile applications causes hangs or exceptions

Solution: The timer interrupt was modified in 1.06, and the profiling
handler was not modified to suit.

diff -c2 1.06/gcrt0.s 1.07/gcrt0.s
*** 1.06/gcrt0.s	Sat May 30 22:40:48 1992
--- 1.07/gcrt0.s	Sat May 30 22:56:42 1992
***************
*** 78,81 ****
--- 78,82 ----
  	popl	%eax
  	ljmp	mc_chain /* chain to the next timer vector */
+ 	iret
  
  	.data


Problem: Destructors of global objects were not being called (and thus
cout was not being flushed)

Solution: The linked list of onexit/atexit routines was not being
managed correctly.

diff -c2 1.06/onexit.c 1.07/onexit.c
*** 1.06/onexit.c	Sat May 30 22:30:56 1992
--- 1.07/onexit.c	Sat May 30 22:31:06 1992
***************
*** 24,27 ****
--- 24,28 ----
    a->function = func;
    a->arg = arg;
+   __atexit = a;
  }
  


Problem: There is no way of accessing memory mapped devices that
exist above 1M.

Solution: Accesses between 0xe0000000 and 0xefffffff will
automatically cause that address to be mapped to the physical address
(addr-0xe0000000).

diff -c2 1.06/paging.c 1.07/paging.c
*** 1.06/paging.c	Mon Jun  1 11:19:48 1992
--- 1.07/paging.c	Mon Jun  1 11:21:12 1992
***************
*** 436,439 ****
--- 436,462 ----
        goto got_area;
  
+   if (vaddr >= 0xf0000000L)
+   {
+     pdi = (vaddr >> 22) & 0x3ff;
+     if (!(pd[pdi] & PT_P))	/* put in a mapped page table */
+     {
+       pn = valloc(VA_640);
+       pt = (word32 far *)((word32)pn << 24);
+       pd[pdi] = ((word32)pn<<12) | PT_P | PT_W | PT_I;
+       vaddr &= 0x0fffffffL;
+       for (pti=0; pti<1024; pti++)
+       {
+         pt[pti] = PT_W | PT_P | PT_I | vaddr;
+         vaddr += 4096;
+       }
+       return 0;
+     }
+     pt = (word32 far *)((pd[pdi]&~0xFFF) << 12);
+     vaddr &= 0x0ffff000L;
+     pti = (vaddr>>12) & 0x3ff;
+     pt[pti] = vaddr | PT_P | PT_W | PT_I;
+     return 0;
+   }
+ 
    printf("Segmentation violation in pointer 0x%08lx at %x:%lx\n",
     tss_ptr->tss_cr2-ARENA, tss_ptr->tss_cs, tss_ptr->tss_eip);