c/7960: GCC-3.2 for ARM does not work with c-code interrupt function

c/7960: GCC-3.2 for ARM does not work with c-code interrupt function

[dong_geming]

>Number:         7960
>Category:       c
>Synopsis:       GCC-3.2 for ARM does not work with c-code interrupt function
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 17 19:56:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Embest
>Release:        arm-elf-gcc verson 3.2
>Organization:
>Environment:
Cygwin(Win32)
>Description:
Hi,
  The arm-elf-gcc version 3.2 genrate wrong code when I compile a c-code interrupt function with option -mthumb-interwork.
  If compile the c-code interrupt function without option -mthumb-interwork, It seems correct.
>How-To-Repeat:
/*The c-code interrupt function to be compiled:(irq.c)*/

void ext_IRQ0_handler(void) __attribute__ ((interrupt ("IRQ")));
/*-----------------------------------------------------*/
/* Function Name       : ext_IRQ0_handler              */
/*-----------------------------------------------------*/
void ext_IRQ0_handler(void)
{
    int i = 1;
    return;
}

If Compiled with: arm-elf-gcc -mthumb-interwork -gdwarf -c irq.c -o irq.o
Disassemble the irq.o:

irq.o:     file format elf32-littlearm

Disassembly of section .text:

00000000 <ext_IRQ0_handler>:
   0:	e52dc004 	str	ip, [sp, -#4]!
   4:	e1a0c00d 	mov	ip, sp
   8:	e24ee004 	sub	lr, lr, #4	; 0x4
   c:	e92dd808 	stmdb	sp!, {r3, fp, ip, lr, pc}
  10:	e24cb004 	sub	fp, ip, #4	; 0x4
  14:	e24dd004 	sub	sp, sp, #4	; 0x4
  18:	e3a03001 	mov	r3, #1	; 0x1
  1c:	e50b3018 	str	r3, [fp, -#24]
  20:	e95b5808 	ldmdb	fp, {r3, fp, ip, lr}^  /*This is wrong!!!!!*/


if Compiled with: arm-elf-gcc -gdwarf -c irq.c -o irq.o
Disassemble the irq.o:

irq.o:     file format elf32-littlearm

Disassembly of section .text:

00000000 <ext_IRQ0_handler>:
   0:	e52dc004 	str	ip, [sp, -#4]!
   4:	e1a0c00d 	mov	ip, sp
   8:	e24ee004 	sub	lr, lr, #4	; 0x4
   c:	e92dd808 	stmdb	sp!, {r3, fp, ip, lr, pc}
  10:	e24cb004 	sub	fp, ip, #4	; 0x4
  14:	e24dd004 	sub	sp, sp, #4	; 0x4
  18:	e3a03001 	mov	r3, #1	; 0x1
  1c:	e50b3018 	str	r3, [fp, -#24]
  20:	e95b9808 	ldmdb	fp, {r3, fp, ip, pc}^  /*This is maybe right!!!!*/


I need someone help me to resolve the problem as soon as possible, Because it's very important to me, Thank you very much.
My Email: dong_geming@hotmail.com
>Fix:
I think maybe some source file of gcc should be modified, but I don't know how to 
>Release-Note:
>Audit-Trail:
>Unformatted:
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