Okay, here's what I did. Instead of continuing to work with my example, I took the
syslib sample code from the prc-tools-samples and modified it minimally to demonstrate
the problem. It creates a sample library called GaussLib-syslib.prc. Here's the header
file for it (not modified by me):
GaussLib.h
----------------------------------------------------------
#ifndef GAUSSLIB_H
#define GAUSSLIB_H
#include <LibTraps.h>
/* Note that these must be evaluated by the preprocessor. In particular,
they must be #defines not enum values. In fact, it's perfectly valid
just to write SYS_TRAP(sysLibTrapCustom+1) etc in the function
declarations below. */
#define GaussLibCreate_trapno sysLibTrapCustom
#define GaussLibRead_trapno sysLibTrapCustom+1
#define GaussLibAdd_trapno sysLibTrapCustom+2
#define GaussLibMul_trapno sysLibTrapCustom+3
#ifndef GAUSSLIB_TRAP
#define GAUSSLIB_TRAP(trapno) SYS_TRAP(trapno)
#endif
typedef struct {
Int32 re, im;
} Gauss_t;
Err GaussLibOpen (UInt16 refNum)
GAUSSLIB_TRAP(sysLibTrapOpen);
Err GaussLibClose (UInt16 refNum, UInt16 *numappsP)
GAUSSLIB_TRAP(sysLibTrapClose);
void GaussLibCreate (UInt16 refNum, Gauss_t *val, Int32 re, Int32 im)
GAUSSLIB_TRAP(GaussLibCreate_trapno);
void GaussLibRead (UInt16 refNum, const Gauss_t *val, Int32 *re, Int32 *im)
GAUSSLIB_TRAP(GaussLibRead_trapno);
void GaussLibAdd (UInt16 refNum, Gauss_t *sum,
const Gauss_t *a, const Gauss_t *b)
GAUSSLIB_TRAP(GaussLibAdd_trapno);
void GaussLibMul (UInt16 refNum, Gauss_t *prod,
const Gauss_t *a, const Gauss_t *b)
GAUSSLIB_TRAP(GaussLibMul_trapno);
#endif
-----------------------------------------------------------
Here's the implementation. I modified GaussLibCreate() by adding the first three lines
in the function body (float a,b; a=2.0; b=3.0*a;).
GaussLib.c:
-----------------------------------------------------------
#include <SystemMgr.h>
#define GAUSSLIB_TRAP(trapno)
#include "GaussLib.h"
Err
start (UInt16 refnum, SysLibTblEntryPtr entryP) {
extern void *jmptable ();
entryP->dispatchTblP = (void *) jmptable;
entryP->globalsP = NULL;
return 0;
}
typedef struct {
UInt16 refcount;
} GaussLib_globals;
Err
GaussLibOpen (UInt16 refnum) {
SysLibTblEntryPtr entryP = SysLibTblEntry (refnum);
GaussLib_globals *gl = entryP->globalsP;
if (!gl) {
/* We need to allocate space for the globals. */
gl = entryP->globalsP = MemPtrNew (sizeof (GaussLib_globals));
MemPtrSetOwner (gl, 0);
gl->refcount = 0;
}
gl->refcount++;
return 0;
}
Err
GaussLibClose (UInt16 refnum, UInt16 *numappsP) {
SysLibTblEntryPtr entryP = SysLibTblEntry (refnum);
GaussLib_globals *gl = entryP->globalsP;
if (!gl) {
/* We're not open! */
return 1;
}
/* Clean up. */
*numappsP = --gl->refcount;
if (*numappsP == 0) {
MemChunkFree (entryP->globalsP);
entryP->globalsP = NULL;
}
return 0;
}
Err
nothing (UInt16 refnum) {
return 0;
}
void
GaussLibCreate (UInt16 refNum, Gauss_t *val, Int32 re, Int32 im) {
float a,b;
a=2.0;
b=3.0*a;
val->re = re;
val->im = im;
}
void
GaussLibRead (UInt16 refNum, const Gauss_t *val, Int32 *re, Int32 *im) {
*re = val->re;
*im = val->im;
}
void
GaussLibAdd (UInt16 refNum, Gauss_t *sum, const Gauss_t *a, const Gauss_t *b) {
sum->re = a->re + b->re;
sum->im = a->im + b->im;
}
void
GaussLibMul (UInt16 refNum, Gauss_t *prod, const Gauss_t *a, const Gauss_t *b) {
Int32 re = (a->re*b->re)-(a->im*b->im);
prod->im = (a->re*b->im)+(a->im*b->re);
prod->re = re;
}
-----------------------------------------------------------
Here's what's in GaussLib.def (used by stubgen), which I did not modify:
--------------------------------------------------
syslib { "Gauss SysLib Library" GauS }
export {
GaussLibOpen GaussLibClose nothing nothing
GaussLibCreate GaussLibRead GaussLibAdd GaussLibMul
}
----------------------------------------------------
Here's the makefile:
--------------------------------------------------
CC = m68k-palmos-gcc
AS = m68k-palmos-as
CFLAGS = -Wall -O2
GaussLib-syslib.prc: GaussLib.def GaussLib
build-prc -o $@ GaussLib.def GaussLib
GaussLib_objs = GaussLib.o GaussLib-dispatch.o
GaussLib: $(GaussLib_objs)
$(CC) -nostartfiles -o $@ $(GaussLib_objs)
GaussLib.o: GaussLib.c GaussLib.h
GaussLib-dispatch.o: GaussLib-dispatch.s
GaussLib-dispatch.s: GaussLib.def
m68k-palmos-stubgen GaussLib.def
--------------------------------------------------
Here's the output from the make:
-------------------------------------------------------
m68k-palmos-gcc -Wall -O2 -c -o GaussLib.o GaussLib.c
m68k-palmos-stubgen GaussLib.def
m68k-palmos-as -o GaussLib-dispatch.o GaussLib-dispatch.s
m68k-palmos-gcc -nostartfiles -o GaussLib GaussLib.o GaussLib-dispatch.o
build-prc -o GaussLib-syslib.prc GaussLib.def GaussLib
GaussLib: warning: global data ignored
-------------------------------------------------------
Here's the output from running m68k-palmos-objdump --section-headers on GaussLib:
-------------------------------------------------------
GaussLib: file format coff-m68k
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000e90 00000000 00000000 000000a8 2**2
CONTENTS, ALLOC, LOAD, CODE
1 .data 0000001c 00000000 00000000 00000f38 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 0000001c 0000001c 00000000 2**2
ALLOC
--------------------------------------------------------
Any ideas on how to fix this would be greatly appreciated.
Dave
-------Original Message-------
From: Aaron Ardiri <[EMAIL PROTECTED]>
Sent: 03/10/03 01:09 PM
To: Palm Developer Forum <[EMAIL PROTECTED]>
Subject: Re: Re: floats in syslib shared library under prc-tools 2.2?
>
> > I gave that a try but it didn't work. The linker complained about not
> being able to resolve the reference to the function from the jump table.
> I tried "static" on both the declaration and definition, and then on
> each separately, with the same result each time.
>
> I went back to the original GaussLib example (which I was able to
> build successfully) and added the following three lines of code
> to the GaussLibCreate function:
>
> float a,b;
> a=2.0;
> b=3.0*a;
>
> This was enough to generate the "global data ignored" message from
> build-prc. If I comment out the third line, the message goes away. Why
> would this line cause global data to be created? Arghhhh. Is it a
> compiler or linker switch set wrong?
what eror are you getting exactly (show us the output from the shell)
what are your compiler/linker switches? :) need to give us info for us
to be able to help you in any way..
---
Aaron Ardiri [EMAIL PROTECTED]
CEO - CTO +46 70 656 1143
Mobile Wizardry <a target=_blank
href="http://www.mobilewizardry.com/";>http://www.mobilewizardry.com/</a>
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