Hello Chris,
as you know I am testing Raspberry Pi to integrate
previous work and help this year GSoC students
and I am testing dlopen on the current RTEMS master.
My previous tests on LPC17xx, MPC5200, i386 and after
some of your corrections even TMS570
worked nicely. But I have noticed some strange problem
with RPi1. It is a little newer master with U-boot
fixes but that should not be a problem, I hope.
The test code
--------------------------------------------------
#include <stdio.h>
int main(int argc, char *argv[])
{
int i;
printf("%s: dynamicaly loaded code called\n", argv[0]);
for (i = 1; i < argc; i++) {
printf("%s: argument %i: %s\n", argv[0], i, argv[i]);
}
return 0;
}
--------------------------------------------------
is compiled to the ELF object file. I use
handle = dlopen (call_file_name, RTLD_NOW | RTLD_GLOBAL);
...
if (dlinfo (handle, RTLD_DI_UNRESOLVED, &unresolved) < 0)
message = "dlinfo error checking unresolved status";
else if (unresolved)
message = "has unresolved externals"; /* check and print */
...
call = dlsym (handle, call_symbol);
if (call == NULL) {
...
call_ret = call(argc, argv);
All seem to be right to this place but when I disassemble target
function I get
0x1cb018: push {r4, r5, r6, r7, r8, lr}
0x1cb01c: mov r7, r0
0x1cb020: mov r6, r1
0x1cb024: ldr r0, [pc, #64] ; 0x1cb06c
0x1cb028: ldr r1, [r1]
0x1cb02c: bl 0x1cb02c
!!!!!!!!!!!!!!!
0x1cb030: cmp r7, #1
0x1cb034: ble 0x1cb064
0x1cb038: mov r5, r6
0x1cb03c: mov r4, #1
It seem that call to printf function is not updated.
Symbols reported by object file are
omk-template/appdl/rootfs/bin/appdl_print-rpi1.o: ELF 32-bit LSB relocatable,
ARM, version 1 (SYSV), not stripped
00000000 t $a
00000054 t $d
00000000 r $d
00000010 N $d
00000000 T main
U printf
readelf reports
Relocation section '.rel.text.startup.main' at offset 0x1730 contains 4
entries:
Offset Info Type Sym.Value Sym. Name
00000014 0000161c R_ARM_CALL 00000000 printf
00000040 0000161c R_ARM_CALL 00000000 printf
00000054 00000802 R_ARM_ABS32 00000000 .rodata.main.str1.4
00000058 00000802 R_ARM_ABS32 00000000 .rodata.main.str1.4
Symbol table '.symtab' contains 23 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 FILE LOCAL DEFAULT ABS appdl_print.c
....
20: 00000000 0 SECTION LOCAL DEFAULT 22
21: 00000000 92 FUNC GLOBAL DEFAULT 4 main
22: 00000000 0 NOTYPE GLOBAL DEFAULT UND printf
So it looks mostly OK.
Have you some idea.
Best wishes,
Pavel
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