dll building : segmentation faults

dll building : segmentation faults

[Andreas Jellinghaus (bei rf)]

gcc    -c dllentry.c -o dllentry.o
ld -s --base-file my_dll.base --entry _dll_entry@12 \
        --dll --output my_dll.jnk dllentry.o 
dlltool --base-file my_dll.base --def my_dll.def --dllname my_dll.dll \
        --output-exp my_dll.exp --output-lib my_dll.a 
ld -s --dll --entry _dll_entry@12 --output my_dll.dll my_dll.exp  dllentry.o 

working dllentry.c :
#include <windows.h>
asm(".section .idata$3\n" ".long 0,0,0,0,0,0,0,0");
WINAPI dll_entry(int a,int b,int c) { return 1; }
char* dummy() { return ""; }

not working dllentry.c :
#include <windows.h>
asm(".section .idata$3\n" ".long 0,0,0,0,0,0,0,0");
WINAPI dll_entry(int a,int b,int c) { return 1; }
void dummy() { return ; }

(also not working int dummy, int* dummy, ...).  any hints ? i'm using gnu win
32, beta 18 (i tried this on winnt and linux with the same result).

andreas

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Re: dll building : segmentation faults

[Philippe GIACINTI]

Hi,

1) The fixup asm(".section .idata$3 ...") is here to terminate the Import
Directory Table in which each element is 5x32 bits long and which should be
terminated with a NULL element.
So I think the correct fixup should be
	asm(".section .idata$3\n" ".long 0,0,0,0,0"); only 5 zeros ...

2) May be can you try to put the fixup at end of your file, I had problems
which were solved that way ... ( don't ask me why )

#include <windows.h>
/* asm(".section .idata$3\n" ".long 0,0,0,0,0,0,0,0"); not here */
WINAPI dll_entry(int a,int b,int c) { return 1; }
void dummy() { return ; }
/* put it here */
asm(".section .idata$3\n" ".long 0,0,0,0,0");

3) I had also some troubles with strange relocations that I have solved in
adding a third link pass ...


Hope this helps,

Best regards.

-- 

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