[Fwd: ARM char array on stack]

[Michael Trimarchi]

--- Begin Message ---

Hi,
if I define this type:

typedef unsigned char UCHAR __attribute__((aligned(32)));

void func(void) {
char example;
UCHAR vector[40];
...


}

The vector array is 4 byte alignment in any case?

Regards Michael





--- End Message ---

.rodata gcc 3.3.3 gcc 2.95.2

[Michael Trimarchi]

Hi all,

I have different assembler code and I notice that the gcc 3.3.3 add this 
information in the asm code:


.section.rodata.str1.4,"aMS",%progbits,1
align  2
.LC0:
  .ascii  "filename\000"

Generated by gcc 2.95.2 19991024 (release) for ARM/elf
doesn't have this section

So when I build the library from different object I have char array not 
align. It is possible to remove at compilation time?


Regards
Michael

smart memcpy

[Michael Trimarchi]

Hi all,
is it possible to map a region on memory copy on write using this idea? 
I have an invalid argument in the mmap call.

Why?
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define MAXPATH 255

int main (int argc, char **argv)
{
  char *s,*x;
  int i;
  int addr;
  int fd;   
  int size=40960; 
  char file_memory[MAXPATH];

  pid_t p=getpid();
  s=malloc(size);
  sprintf(file_memory,"/proc/%d/mem",(int)p);
  fd = open(file_memory,O_RDONLY);
  if (fd < 0) {
  perror(file_memory);
  exit(-1);
  }
  printf ("start %s\n",file_memory);
  printf("s = %p\n",s);
  memset(s, 'X', size);
  //lseek(fd,(int)s,SEEK_SET);
  //read(fd,&addr,1);
  //printf("%c", addr);
   
   x = mmap(0,size,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,(int)s);

   if ((int)(x)>0) {
   printf("x = %p\n",x);
   *x='P';
   for (i=0;i<40; i++)
  printf("sval=%c;xval=%c;",*(x+i),*(s+i)); 
  } else {

printf("%s\n",strerror(errno));
  }  
   return 0;

}

arm sof float

[Michael Trimarchi]

Hi all,
I have this function defined twice. One in the libgcc2.c file and one in 
gcc/config/arm/ieee754-df.S

__floatdisf

I have problem during compilation of a arm soft float toolchain. Is 
there any fix?

Regards Michael

Re: arm sof float

[Michael Trimarchi]

Richard Earnshaw wrote:


On Mon, 2005-11-14 at 16:52, Michael Trimarchi wrote:
 


Hi all,
I have this function defined twice. One in the libgcc2.c file and one in 
gcc/config/arm/ieee754-df.S

__floatdisf

I have problem during compilation of a arm soft float toolchain. Is 
there any fix?

Regards Michael
   



The build system should only be using the latter.  What configuration
are you using?  And what version of gcc?

R.

 



/home/luigi/crosstool-0.38/build/arm-9tdmi-linux-gnu/gcc-4.0.1-glibc-2.3.5/gcc-4.0.1/configure   
--target=arm-9tdmi-linux-gnu --host=i686-host_pc-linux-gnu 
--prefix=/opt/crosstool/gcc-4.0.1-glibc-2.3.5/arm-9tdmi-linux-gnu 
--with-float=soft --with-cpu=arm9tdmi --enable-cxx-flags=-mcpu=arm9tdmi 
--with-headers=/opt/crosstool/gcc-4.0.1-glibc-2.3.5/arm-9tdmi-linux-gnu/arm-9tdmi-linux-gnu/include 
--with-local-prefix=/opt/crosstool/gcc-4.0.1-glibc-2.3.5/arm-9tdmi-linux-gnu/arm-9tdmi-linux-gnu 
--disable-nls --enable-threads=posix --enable-symvers=gnu 
--enable-__cxa_atexit --enable-shared --enable-c99 --enable-long-long 
--with-gcc-version-trigger=/home/luigi/crosstool-0.38/build/arm-9tdmi-linux-gnu/gcc-4.0.1-glibc-2.3.5/gcc-4.0.1/gcc/version.c 
--enable-languages=c,c++


Linking error

libgcc/./_floatdidf_s.o: In function `__floatdidf':
libgcc2.c:(.text+0x0): multiple definition of `__floatdidf'
libgcc/./_addsubdf3_s.o:/home/luigi/crosstool-0.38/build/arm-9tdmi-linux-gnu/gcc-4.0.1-glibc-2.3.5/gcc-4.0.1/gcc/config/arm/ieee754-df.S:474: 
first defined 
here/opt/crosstool/gcc-4.0.1-glibc-2.3.5/arm-9tdmi-linux-gnu/arm-9tdmi-linux-gnu/bin/ld: 
Warning: size of symbol `__floatdidf' changed from 108 in 
libgcc/./_addsubdf3_s.o to 140 in libgcc/./_floatdidf_s.o

libgcc/./_floatdisf_s.o: In function `__floatdisf':
libgcc2.c:(.text+0x0): multiple definition of `__floatdisf'
libgcc/./_addsubsf3_s.o:/home/luigi/crosstool-0.38/build/arm-9tdmi-linux-gnu/gcc-4.0.1-glibc-2.3.5/gcc-4.0.1/gcc/config/arm/ieee754-sf.S:315: 
first defined 
here/opt/crosstool/gcc-4.0.1-glibc-2.3.5/arm-9tdmi-linux-gnu/arm-9tdmi-linux-gnu/bin/ld: 
Warning: size of symbol `__floatdisf' changed from 172 in 
libgcc/./_addsubsf3_s.o to 252 in libgcc/./_floatdisf_s.o

collect2: ld returned 1 exit status

Regards
Michael