egcs-971023 cannot compile linux ld.so-1.9.5

egcs-971023 cannot compile linux ld.so-1.9.5

[Szalkai Akos]

Hi,

The details: cc1 (from egcs-9710{16,23}, haven't checked others) fails
with a 'forbidden register spilled' (from reload1.c) error while
compiling d-link/boot1.c.  gcc-2.7.2.3 correctly compiles it.

Looking around the optimization options, it seems that the compiler
only fails when both -fPIC (or -fpic) and -finline are on.  (But ld.so 
does not work with either of them turned off.)

If you need more details, tell me.

Akos

Re: egcs-971023 cannot compile linux ld.so-1.9.5

[H.J. Lu]

> 
> Hi,
> 
> The details: cc1 (from egcs-9710{16,23}, haven't checked others) fails
> with a 'forbidden register spilled' (from reload1.c) error while
> compiling d-link/boot1.c.  gcc-2.7.2.3 correctly compiles it.
> 
> Looking around the optimization options, it seems that the compiler
> only fails when both -fPIC (or -fpic) and -finline are on.  (But ld.so 
> does not work with either of them turned off.)
> 
> If you need more details, tell me.
> 
> Akos
> 
> 

The bug is in ld.so. Please try this patch.



-- 
H.J. Lu (hjl@gnu.ai.mit.edu)
--
Index: d-link/Makefile
===================================================================
RCS file: /home/work/cvs/linux/ld-so/d-link/Makefile,v
retrieving revision 1.1.1.2
retrieving revision 1.5
diff -u -r1.1.1.2 -r1.5
Index: d-link/i386/syscall.h
===================================================================
RCS file: /home/work/cvs/linux/ld-so/d-link/i386/syscall.h,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -r1.1.1.2 -r1.2
--- syscall.h	1997/03/31 19:33:06	1.1.1.2
+++ syscall.h	1997/07/10 03:37:18	1.2
@@ -87,20 +87,21 @@
 		    "rm" (addr), "rm" (size), "rm" (prot), "rm" (flags), 
 		    "rm" (fd), "rm" (f_offset));
 #else
+  unsigned long buffer[6];
+
+  buffer[0] = (unsigned long)addr;
+  buffer[1] = (unsigned long)size;
+  buffer[2] = (unsigned long)prot;
+  buffer[3] = (unsigned long)flags;
+  buffer[4] = (unsigned long)fd;
+  buffer[5] = (unsigned long)f_offset;
+
   __asm__ volatile ("pushl %%ebx\n\t" \
-		    "pushl %7\n\t" \
-		    "pushl %6\n\t" \
-		    "pushl %5\n\t" \
-		    "pushl %4\n\t" \
-		    "pushl %3\n\t" \
-		    "pushl %2\n\t" \
-		    "movl %%esp,%%ebx\n\t" \
+		    "movl %%ecx,%%ebx\n\t" \
 		    "int $0x80\n\t" \
-		    "addl $24,%%esp\n\t" \
 		    "popl %%ebx\n" \
 		    : "=a" (malloc_buffer) : "a" (__NR_mmap),
-		    "rm" (addr), "rm" (size), "rm" (prot), "rm" (flags), 
-		    "rm" (fd), "rm" (f_offset));
+		    "c" (buffer));
 #endif
   return malloc_buffer;
 }