diff options
Diffstat (limited to 'lib/libutee/arch/arm/gprof/gprof_a64.S')
-rw-r--r-- | lib/libutee/arch/arm/gprof/gprof_a64.S | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libutee/arch/arm/gprof/gprof_a64.S b/lib/libutee/arch/arm/gprof/gprof_a64.S new file mode 100644 index 0000000..fd3b987 --- /dev/null +++ b/lib/libutee/arch/arm/gprof/gprof_a64.S @@ -0,0 +1,77 @@ +/* + * Copyright (c) 2016, Linaro Limited + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 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. + */ + +#include <asm.S> + +#ifdef CFG_TA_GPROF_SUPPORT + + +/* + * Convert return address to call site address by subtracting the size of one + * instruction. + */ +.macro adjust_pc rd, rn + sub \rd, \rn, #4 +.endm + +/* + * void __utee_mcount(void *return_address) + * @return_address: return address to instrumented function + * + * With the -pg option, the compiler inserts a call to _mcount into + * every function prologue. + * x0 contains the value of lr (x30) before the call, that is the return + * address to the caller of the instrumented function. The callee, i.e. the + * instrumented function itself, is determined from the current value of x30. + * Then we call: + * void __mcount_internal(void *frompc, void *selfpc); + * + * _mcount is defined and set to the value of this function by the linker + * script if the TA is instrumented, i.e., if _mcount is referenced + */ +FUNC __utee_mcount, : + stp x29, x30, [sp, #-16]! + mov x29, sp + adjust_pc x0, x0 + adjust_pc x1, x30 + bl __mcount_internal + ldp x29, x30, [sp], #16 + ret +END_FUNC __utee_mcount + +#else /* !CFG_TA_GPROF_SUPPORT */ + +/* + * The TA linker script always references __utee_mcount so provide a version + * that does nothing + */ + .weak __utee_mcount +FUNC __utee_mcount, : + ret +END_FUNC __utee_mcount + +#endif /* CFG_TA_GPROF_SUPPORT */ |