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https://github.com/autc04/Retro68.git
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88 lines
916 B
ArmAsm
88 lines
916 B
ArmAsm
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.arch armv7-a
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.global _start
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.syntax unified
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.text
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.thumb
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.macro do_calls
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@ The following four instructions are accepted by gas, but generate
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@ meaningless code.
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@bl.w arm0
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@bl.w arm4
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@nop
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@bl.w arm0
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@bl.w arm4
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@nop
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blx.w arm0
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blx.w arm4
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nop
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blx.w arm0
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blx.w arm4
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nop
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bl.w thumb0
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bl.w thumb2
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bl.w thumb4
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bl.w thumb6
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nop
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bl.w thumb0
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bl.w thumb2
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bl.w thumb4
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bl.w thumb6
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nop
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@ These eight are all accepted by gas, but generate bad code.
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@blx.w thumb0
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@blx.w thumb2
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@blx.w thumb4
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@blx.w thumb6
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@nop
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@blx.w thumb0
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@blx.w thumb2
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@blx.w thumb4
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@blx.w thumb6
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.endm
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.thumb_func
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.align 3
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_start:
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do_calls
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.arm
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.align 3
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arm0:
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bx lr
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.align 3
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nop
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arm4:
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bx lr
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.thumb
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.thumb_func
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.align 3
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thumb0:
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bx lr
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.thumb_func
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.align 3
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nop
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thumb2:
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bx lr
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.thumb_func
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.align 3
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nop
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nop
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thumb4:
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bx lr
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.thumb_func
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.align 3
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nop
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nop
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nop
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thumb6:
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bx lr
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backwards:
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do_calls
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