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Date: Fri, 22 Mar 2002 08:06:00 -0000
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Subject: target/6040: ARM interrupt attribute generats wrong code (3.1-cvs)
X-SW-Source: 2002-03/txt/msg00844.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         6040
>Category:       target
>Synopsis:       ARM interrupt attribute generats wrong code (3.1-cvs)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 22 08:06:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Tobias Ringstrom
>Release:        gcc version 3.1 20020321 (prerelease)
>Organization:
>Environment:
Crosscompiler for arm-elf
>Description:
Compile the following code with "arm-elf-gcc -S"

void foo(void) __attribute__((__interrupt__));
void foo()
{
        int a=0;
}

gives the following assembler code:

        .file   "tmp2.c"
        .text
        .align  2
        .global foo
        .type   foo,function
foo:
        @ Interrupt Service Routine.
        @ args = 0, pretend = 0, frame = 4
        @ frame_needed = 1, uses_anonymous_args = 0
        str     ip, [sp, #-4]!
        mov     ip, sp
        sub     lr, lr, #4
        stmfd   sp!, {r3, fp, ip, lr, pc}
        sub     fp, ip, #4
        sub     sp, sp, #4
        mov     r3, #0
        str     r3, [fp, #-24]
        ldmea   fp, {r3, fp, ip, pc}^
.Lfe1:
        .size   foo,.Lfe1-foo
        .ident  "GCC: (GNU) 3.1 20020321 (prerelease)"

Major problem:
The stack pointer (sp) is never restored!

Comment/question:
There are four lost bytes, but that might be due to alignment of the stack.  Is it?

/Tobias
>How-To-Repeat:
See Description above!
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: