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* c/10834: GCC for ARM 3.3 still generates incorrect instructions for functions with __attribute__ ((interrupt ("IRQ")))
@ 2003-05-17 9:26 dong_geming
0 siblings, 0 replies; only message in thread
From: dong_geming @ 2003-05-17 9:26 UTC (permalink / raw)
To: gcc-gnats; +Cc: nickc
>Number: 10834
>Category: c
>Synopsis: GCC for ARM 3.3 still generates incorrect instructions for functions with __attribute__ ((interrupt ("IRQ")))
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Sat May 17 09:26:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Adam Dong
>Release: GCC 3.3
>Organization:
>Environment:
cygwin --host=i686-pc-cygwin --target=arm-elf
>Description:
I cmopiled the following file with gcc 3.3 for ARM.
/* 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 */
If it was Compiled with the following command:
arm-elf-gcc -gdwarf ext_irq.c -o.\debug\ext_irq.o
then Dump the ext_irq.o, and we can get the following code:
00000000 <ext_IRQ0_handler>:
0: e52dc004 str ip, [sp, -#4]!
4: e1a0c00d mov ip, sp
8: e24ee004 sub lr, lr, #4 ; 0x4
c: e92dd80e stmdb sp!, {r1, r2, r3, fp, ip, lr, pc}
10: e24cb004 sub fp, ip, #4 ; 0x4
14: e24dd004 sub sp, sp, #4 ; 0x4
18: e3a03000 mov r3, #0 ; 0x0
1c: e50b3020 str r3, [fp, -#32]
20: e24b1020 sub r1, fp, #32 ; 0x20
24: e5913000 ldr r3, [r1]
28: e1a02003 mov r2, r3
2c: e50b2020 str r2, [fp, -#32]
30: e2833001 add r3, r3, #1 ; 0x1
34: e5813000 str r3, [r1]
38: e95b980e ldmdb fp, {r1, r2, r3, fp, ip, pc}^
On the other way, If it was Compiled with the following command:
arm-elf-gcc -mthumb-interwork -gdwarf ext_irq.c -o.\debug\ext_irq.o
then Dump the ext_irq.o, and we can get the following code:
00000000 <ext_IRQ0_handler>:
0: e52dc004 str ip, [sp, -#4]!
4: e1a0c00d mov ip, sp
8: e24ee004 sub lr, lr, #4 ; 0x4
c: e92dd80e stmdb sp!, {r1, r2, r3, fp, ip, lr, pc}
10: e24cb004 sub fp, ip, #4 ; 0x4
14: e24dd004 sub sp, sp, #4 ; 0x4
18: e3a03000 mov r3, #0 ; 0x0
1c: e50b3020 str r3, [fp, -#32]
20: e24b1020 sub r1, fp, #32 ; 0x20
24: e5913000 ldr r3, [r1]
28: e1a02003 mov r2, r3
2c: e50b2020 str r2, [fp, -#32]
30: e2833001 add r3, r3, #1 ; 0x1
34: e5813000 str r3, [r1]
38: e91b680e ldmdb fp, {r1, r2, r3, fp, sp, lr}
3c: e89d1000 ldmia sp, {ip}
40: e25ef004 subs pc, lr, #4 ; 0x4
*******************************
***********PROBLEM*************
*******************************
Both of the compiled results are not correct. Because
the "sp" register is not restored correctly, It can be
discovered easily, if we debug this codes on a E.V. board.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2003-05-17 9:26 c/10834: GCC for ARM 3.3 still generates incorrect instructions for functions with __attribute__ ((interrupt ("IRQ"))) dong_geming
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