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target/7328: stack restoration for ARM interrupt("IRQ") attribute
- From: jean-marc dot koller at csem dot ch
- To: gcc-gnats at gcc dot gnu dot org
- Date: 16 Jul 2002 13:57:59 -0000
- Subject: target/7328: stack restoration for ARM interrupt("IRQ") attribute
- Reply-to: jean-marc dot koller at csem dot ch
>Number: 7328
>Category: target
>Synopsis: stack restoration for ARM interrupt("IRQ") attribute
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Tue Jul 16 07:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Jean-Marc Koller, CSEM SA, Switzerland
>Release: gcc 3.1 and "3.2 20020715 (experimental)"
>Organization:
>Environment:
SuSE Linux i686, gcc compiled for ARM-elf target
>Description:
On interrupt calls, the interrupt handler does not restore the interrupt stack pointer, thus leading to interrupt stack overflow.
The following C code:
"
void isr_IRQ() __attribute__((interrupt("IRQ")));
extern void dummy();
void isr_IRQ()
{
dummy();
}
"
generates:
"
isr_IRQ:
@ Interrupt Service Routine.
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
str ip, [sp, #-4]!
sub lr, lr, #4
mov ip, sp
stmfd sp!, {r0, r1, r2, r3, fp, ip, lr, pc}
sub fp, ip, #4
bl dummy
ldmea fp, {r0, r1, r2, r3, fp, ip, pc}^
"
which doesn't restore sp on ldmea.
>How-To-Repeat:
arm-elf-gcc -Wall -S except_test.c -O2
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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