This is the mail archive of the crossgcc@sources.redhat.com mailing list for the crossgcc project.

See the CrossGCC FAQ for lots more information.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

arm interrupts using keyword __attribute__

Hi All,

I'm using the gcc 3.0.4 with newlib10 for the ARM 
(ARM7tdmi core)

the following C code generates the ASM interrupt
handler below:
It seems to me that the first statement mov ip,sp is
wrong.
The ip (R12) is not a banked register.  This handler
seems to trash the
the soft-float math pack. Am I missing something about
how the register 
are used?
Thanks
Richard Slaughter


void test_irq(void) __attribute__
((interrupt("IRQ")));
void test_irq(void)
{;}


@ Generated by gcc 3.0.4 for ARM/elf
	.file	"hw.i"
	.text
	.align	2
	.global	test_irq
	.type	test_irq,function
test_irq:
	@ Interrupt Service Routine.
	@ args = 0, pretend = 0, frame = 0
	@ frame_needed = 1, current_function_anonymous_args =
0
	mov	ip, sp
	stmfd	sp!, {fp, ip, lr, pc}
	sub	fp, ip, #4
	ldmea	fp, {fp, sp, lr}
	subs	pc, lr, #4


=====


__________________________________________________
Do You Yahoo!?
Yahoo! Tax Center - online filing with TurboTax
http://taxes.yahoo.com/

------
Want more information?  See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/
Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]