Subversion Repositories open8_urisc

# thumb_blx_out_of_range.s

# Test THUMB/THUMB-2 blx instructions just out of the branch range limits.

        .syntax unified

        .section        .text.pre,"x"

# Add padding so that target is just output of branch range.

        .space  4

        .global _forward_target

        .global _backward_target

        .type   _backword_target, %function

_backward_target:

        bx      lr

        .size   _backward_target, .-_backward_target

        .text

# Use 256-byte alignment so that we know where the stubs start.

        .align  8

# Define _start so that linker does not complain.

        .align  2

        .global _start

        .code   32

        .type   _start, %function

_start:

        bx      lr

        .size   _start, .-_start

        .global _backward_test

        .code   16

        .thumb_func

        .type   _backward_test, %function

_backward_test:

        bl      _backward_target

        .size   _backward_test, .-_backward_test

        .align  2

        .global _forward_test

        .code   16

        .thumb_func

        .type   _forward_test, %function

_forward_test:

        # Bit 1 of the BLX target comes from bit 1 of branch base address,

        # which is BLX instruction's address + 4.  We intentionally put this

        # forward BLX at an address n*4 + 2 so that the branch offset is

        # bumped up by 2.

        nop.n

        bl      _forward_target

        .size   _forward_test, .-_forward_test

# switch back to ARM mode so that stubs are disassembled correctly.

        .code   32

        nop

        .section        .text.post,"x"

# Add padding so that target is just out of branch range.

        .space  12

        .align 2

        .code   32

        .global _forward_target

        .type   _forward_target, %function

_forward_target:

        bx      lr

        .size   _forward_target, .-_forward_target