Hi all,
I am trying to combine multiple object files into a single relocatable
object file using mspgcc (gcc version 3.2.3), and seems to encounter an
error in the addend field of a relocation entry in the output file. I
wonder if anyone has run into this problem and can kindly offer some
advice. Following are the details.
Thanks.
Martin
I have two .c files: m.c calling a function defined in add2.c
---------------------------------------------------------------
> cat m.c
#include <stdio.h>
extern int add2(int);
int main()
{
int a=5;
printf("m: a=%d, calling add2()\n",a); // (A)
a = add2(a);
printf("m: returned from add2(), a=%d\n",a); // (B)
return 0;
}
---------------------------------------------------------------
> cat add2.c
#include <stdio.h>
int add2(int n) {
printf("add2: input=%d\n", n); // (C)
return n + 2;
}
---------------------------------------------------------------
> msp430-gcc -Wall -Os -c m.c -o m.o
> msp430-gcc -Wall -Os -c add2.c -o add2.o
> msp430-ld -r --unresolved-symbols=ignore-in-object-files --strip-all
-o m.cm m.o add2.o
> readelf -r m.cm
Relocation section '.rela.text' at offset 0x260 contains 9 entries:
Offset Info Type Sym.Value Sym. Name + Addend
0000003a 00000d05 R_MSP430_16_BYTE 00000280 __stack + 0
*00000042 00000105 R_MSP430_16_BYTE 00000000 .text + 0* (A)
00000046 00000905 R_MSP430_16_BYTE 00000000 printf + 0
0000004e 00000e05 R_MSP430_16_BYTE 00000072 add2 + 0
*00000054 00000105 R_MSP430_16_BYTE 00000000 .text + 19***(B)
00000058 00000905 R_MSP430_16_BYTE 00000000 printf + 0
00000060 00000b03 R_MSP430_16 00000000 __stop_progExec__ + 0
*0000007a 00000105 R_MSP430_16_BYTE 00000000 .text + 0***(C)
0000007e 00000905 R_MSP430_16_BYTE 00000000 printf + 0
Listing above shows in *bold* the relocation entries corresponding to
the printf statments in m.c (A, B) and add2.c (C). Note that the
arguments to the printf statements in m.c (A,B) are relocated with the
correct addends, but argument to the printf statement in add2.c (C)
erroneously gets a zero addend causing it to print the same argument as
(A). hexdump of m.cm confirms that the addend field of the .rela type
entry of (C) is indeed wrong and equal zero.
------------------------------------------------------------------------------
Lotusphere 2011
Register now for Lotusphere 2011 and learn how
to connect the dots, take your collaborative environment
to the next level, and enter the era of Social Business.
http://p.sf.net/sfu/lotusphere-d2d
_______________________________________________
Mspgcc-users mailing list
Mspgcc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mspgcc-users
