c/9372: GCC for ARM dose not generate correct instructions for functions with __attribute__ ((interrupt ("IRQ")))
dong_geming@hotmail.com
dong_geming@hotmail.com
Mon Jan 20 14:16:00 GMT 2003
>Number: 9372
>Category: c
>Synopsis: GCC for ARM dose not generate correct instructions for functions with __attribute__ ((interrupt ("IRQ")))
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Jan 20 12:06:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Adam Dong
>Release: gcc 3.2 or 3.2.1
>Organization:
>Environment:
cygwin --host=i686-pc-cygwin
>Description:
/* begin of file ext_irq.c */
void ext_IRQ0_handler(void) __attribute__ ((interrupt ("IRQ")));
void ext_IRQ0_handler(void)
{
int i = 0;
i = i++;
}
/* end of file ext_irq.c */
Compiled with the following command:
arm-elf-gcc -gdwarf ext_irq.c -o.\debug\ext_irq.o
Dump the ext_irq.o, and we can get the following code:
020001d4 <ext_IRQ0_handler>:
20001d4: e52dc004 str ip, [sp, -#4]!
20001d8: e1a0c00d mov ip, sp
20001dc: e24ee004 sub lr, lr, #4 ; 0x4
20001e0: e92dd80e stmdb sp!, {r1, r2, r3, fp, ip, lr, pc}
20001e4: e24cb004 sub fp, ip, #4 ; 0x4
20001e8: e24dd004 sub sp, sp, #4 ; 0x4
20001ec: e3a03000 mov r3, #0 ; 0x0
20001f0: e50b3020 str r3, [fp, -#32]
20001f4: e24b1020 sub r1, fp, #32 ; 0x20
20001f8: e5913000 ldr r3, [r1]
20001fc: e1a02003 mov r2, r3
2000200: e50b2020 str r2, [fp, -#32]
2000204: e2833001 add r3, r3, #1 ; 0x1
2000208: e5813000 str r3, [r1]
200020c: e95b980e ldmdb fp, {r1, r2, r3, fp, ip, pc}^
We know from the codes that the "sp" is not correct when it is pop out. As I use function with __attribute__ ((interrupt ("IRQ"))), the application can not run well, and the "SP" will collapsed. When I use option -mthumb-interwork, the instructions generated by gcc is absolutely wrong.
Can there someone help ASAP??
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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