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Diffstat (limited to 'newlib/libc/machine/arm/strlen-thumb1-Os.S')
| -rw-r--r-- | newlib/libc/machine/arm/strlen-thumb1-Os.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/newlib/libc/machine/arm/strlen-thumb1-Os.S b/newlib/libc/machine/arm/strlen-thumb1-Os.S new file mode 100644 index 000000000..4b504303a --- /dev/null +++ b/newlib/libc/machine/arm/strlen-thumb1-Os.S @@ -0,0 +1,50 @@ +/* Copyright (c) 2015 ARM Ltd. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + * Neither the name of the Linaro nor the + names of its contributors may be used to endorse or promote products + derived from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ + + .macro def_fn f p2align=0 + .text + .p2align \p2align + .global \f + .type \f, %function +\f: + .endm + + .arch armv4t + .eabi_attribute Tag_also_compatible_with, "\006\013" /* ARMv6-M. */ + .eabi_attribute Tag_ARM_ISA_use, 0 + .thumb + .syntax unified + +def_fn strlen p2align=1 + movs r3, #0 +1: + ldrb r2, [r0, r3] + adds r3, r3, #1 + cmp r2, #0 + bne 1b + subs r0, r3, #1 + bx lr + .size strlen, . - strlen |