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force gcc to NOT use thumb?

Etienne SOBOLE over 10 years ago

Note: This was originally posted on 11th December 2010 at http://forums.arm.com

Hi.

I'm using a Beagleboard with gcc
I'm looking for the parameter to use to ask gcc to not use thumb instruction !!!

does anybody know hox I con do that?

Thank's
Etienne

Peter Harris over 10 years ago

Note: This was originally posted on 11th December 2010 at http://forums.arm.com

The gcc options are:

-mthumb or -marm

Iso
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Etienne SOBOLE over 10 years ago

Note: This was originally posted on 11th December 2010 at http://forums.arm.com

Hum.

-marm seems to work thank's
but I still have some interrogation

I have tried this command

gcc -S -marm add.c

an the code produced is

.arch armv7-a
...
.file "add.c"
.text
.align 2
.global add
.type add, %function
add:
@ args = 0, pretend = 0, frame = 8
@ frame_needed = 1, uses_anonymous_args = 0
@ link register save eliminated.
...
bx lr
.size add, .-add
.ident "GCC: (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5"
.section .note.GNU-stack,"",%progbits

My problem is about the
bx lr instruction.

Bx intruction Does it not supposed to swap between ARM and thumb mode ?

Etienne
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Scott Douglass over 10 years ago
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