On Sat, 06 Oct 2007 16:46:09 +0200, "Danny Backx" said:
On Fri, 2007-10-05 at 22:26 +0200, Vitus Jensen wrote:
I'm trying to port a small testprogramm from embedded Visual C 4 to
mingw32ce (cegcc-mingw32ce-0.50-1.i586.rpm). It's text mode, 2 threads,
some printf, some files, nothing fancy but ... it has to use 2 object
libraries (3rd party) and a DLL (my own).
I'm able to compile and link this programm but when I call the 3rd party
library an important call fails. It's the only call with several
parameters so I suspect different calling conventions.
Goes like this:
extern int libconfig(int hd, int subfct, void * parameter);
test()
{
hd = libopen();
res = libconfig(hd, 1, (void *)0815);
res = libconfig(hd, 2, (void *)15);
...
libclose(hd);
}
Result code indicates "invalid subfunction" :-(
The prototype shows no "__syscall" or the like, the object library works
when used with eVC. I've looked at the produced assembler code in the eVC
debugger and it seems parameters are transfered via r0, r1 and r2. Isn't
this the same as in mingw32ce? In my opinion all this indicates that the
program should work. It doesn't :-(
This is probably a silly remark but "0815" is an invalid number. The GNU
C compiler will treat any number that starts with a 0 as octal. In
octal, there's no 8, so the compiler issues an error :
tt.c:8:33: error: invalid digit "8" in octal constant
In case that that isn't your problem, I've attached a source and
assembler file generated by arm-wince-mingw32ce-gcc . Which assembler
instructions does eVC generate for this file ?
See attached code. It looks similar to me, at least the subfunction no
is in register r1, too. But I'm new to ARM assembler, I admit.
BTW: one reason to try cegcc/minw32ce was the lack of a proper CRT in
eVC. I wanted to build a console program using getch() or
setvbuf(_IONBF) but found in the meantime that those things won't work
under cegcc or minw32ce. Is this correct or is that just my fault?
Bye,
Vitus
--
Vitus Jensen, Hannover, Earth, Milky Way
; Listing generated by Microsoft (R) Optimizing Compiler Version 12.20.9775
TTL D:\winapps\swifttest\test.c
CODE32
00000 AREA |.drectve|, DRECTVE
DCB "-defaultlib:coredll.lib "
DCB "-defaultlib:corelibc.lib "
EXPORT |test|
IMPORT |libconfig|
IMPORT |libopen|
IMPORT |libclose|
00000 AREA |.pdata|, PDATA
|$T105| DCD |test|
DCD 0x40001a02
; Function compile flags: /Odt
; File D:\winapps\swifttest\test.c
00000 AREA |.text|, CODE, ARM
00000 |test| PROC
; 4 : {
00000 e52de004 str lr, [sp, #-4]!
00004 e24dd014 sub sp, sp, #0x14
00008 |$M103|
; 5 : int hd, res;
; 6 :
; 7 : hd = libopen();
00008 eb000000 bl libopen
0000c e58d0008 str r0, [sp, #8]
00010 e59d1008 ldr r1, [sp, #8]
00014 e58d1004 str r1, [sp, #4]
; 8 : res = libconfig(hd, 1, (void *)815);
00018 e3a00fcb mov r0, #0xCB, 30
0001c e3802003 orr r2, r0, #3
00020 e3a01001 mov r1, #1
00024 e59d0004 ldr r0, [sp, #4]
00028 eb000000 bl libconfig
0002c e58d000c str r0, [sp, #0xC]
00030 e59d100c ldr r1, [sp, #0xC]
00034 e58d1000 str r1, [sp]
; 9 : res = libconfig(hd, 2, (void *)15);
00038 e3a0200f mov r2, #0xF
0003c e3a01002 mov r1, #2
00040 e59d0004 ldr r0, [sp, #4]
00044 eb000000 bl libconfig
00048 e58d0010 str r0, [sp, #0x10]
0004c e59d1010 ldr r1, [sp, #0x10]
00050 e58d1000 str r1, [sp]
; 10 : libclose(hd);
00054 e59d0004 ldr r0, [sp, #4]
00058 eb000000 bl libclose
; 11 : }
0005c e28dd014 add sp, sp, #0x14
00060 e8bd4000 ldmia sp!, {lr}
00064 e12fff1e bx lr
00068 |$M104|
ENDP ; |test|
END
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