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|
.arch armv7-a
.global _start
.syntax unified
.text
.thumb
.macro do_calls
@ The following four instructions are accepted by gas, but generate
@ meaningless code.
@bl.w arm0
@bl.w arm4
@nop
@bl.w arm0
@bl.w arm4
@nop
blx.w arm0
blx.w arm4
nop
blx.w arm0
blx.w arm4
nop
bl.w thumb0
bl.w thumb2
bl.w thumb4
bl.w thumb6
nop
bl.w thumb0
bl.w thumb2
bl.w thumb4
bl.w thumb6
nop
@ These eight are all accepted by gas, but generate bad code.
@blx.w thumb0
@blx.w thumb2
@blx.w thumb4
@blx.w thumb6
@nop
@blx.w thumb0
@blx.w thumb2
@blx.w thumb4
@blx.w thumb6
.endm
.thumb_func
.align 3
_start:
do_calls
.arm
.align 3
arm0:
bx lr
.align 3
nop
arm4:
bx lr
.thumb
.thumb_func
.align 3
thumb0:
bx lr
.thumb_func
.align 3
nop
thumb2:
bx lr
.thumb_func
.align 3
nop
nop
thumb4:
bx lr
.thumb_func
.align 3
nop
nop
nop
thumb6:
bx lr
backwards:
do_calls
|
