| /* |
| * Copyright (c) 2013-2019, Intel Corporation |
| * |
| * 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 Intel Corporation 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 OWNER 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 "pt_retstack.h" |
| |
| #include "intel-pt.h" |
| |
| |
| void pt_retstack_init(struct pt_retstack *retstack) |
| { |
| if (!retstack) |
| return; |
| |
| retstack->top = 0; |
| retstack->bottom = 0; |
| } |
| |
| int pt_retstack_is_empty(const struct pt_retstack *retstack) |
| { |
| if (!retstack) |
| return -pte_invalid; |
| |
| return (retstack->top == retstack->bottom ? 1 : 0); |
| } |
| |
| int pt_retstack_pop(struct pt_retstack *retstack, uint64_t *ip) |
| { |
| uint8_t top; |
| |
| if (!retstack) |
| return -pte_invalid; |
| |
| top = retstack->top; |
| |
| if (top == retstack->bottom) |
| return -pte_retstack_empty; |
| |
| top = (!top ? pt_retstack_size : top - 1); |
| |
| retstack->top = top; |
| |
| if (ip) |
| *ip = retstack->stack[top]; |
| |
| return 0; |
| } |
| |
| int pt_retstack_push(struct pt_retstack *retstack, uint64_t ip) |
| { |
| uint8_t top, bottom; |
| |
| if (!retstack) |
| return -pte_invalid; |
| |
| top = retstack->top; |
| bottom = retstack->bottom; |
| |
| retstack->stack[top] = ip; |
| |
| top = (top == pt_retstack_size ? 0 : top + 1); |
| |
| if (bottom == top) |
| bottom = (bottom == pt_retstack_size ? 0 : bottom + 1); |
| |
| retstack->top = top; |
| retstack->bottom = bottom; |
| |
| return 0; |
| } |