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i#1569 AArch64: Add "nzcv" test, an alternative to "eflags" test.
Review-URL: https://codereview.appspot.com/296680043
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| /* ********************************************************** | ||
| * Copyright (c) 2014-2015 Google, Inc. All rights reserved. | ||
| * Copyright (c) 2005-2008 VMware, Inc. All rights reserved. | ||
| * **********************************************************/ | ||
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| /* | ||
| * 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 VMware, Inc. 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 VMWARE, INC. 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. | ||
| */ | ||
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| #ifndef ASM_CODE_ONLY /* C code */ | ||
| /* Tests preservation of eflags across indirect branches | ||
| */ | ||
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| #include "tools.h" | ||
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| #define VERBOSE 0 | ||
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| /* asm routine */ | ||
| void test_nzcv_pos(uint pos); | ||
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| const char *flags[] = { | ||
| "N", "Z", "C", "V" | ||
| }; | ||
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| const uint nzcv_pos[] = { | ||
| 31, 30, 29, 28 | ||
| }; | ||
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| #define NUM_FLAGS (sizeof(nzcv_pos) / sizeof(nzcv_pos[0])) | ||
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| void | ||
| test_flag(uint nzcv, uint pos, bool set) | ||
| { | ||
| const char *flag = "*"; | ||
| int i; | ||
| #if VERBOSE | ||
| print("NZCV where %c should be %d: "PFX"\n", flag, set, nzcv); | ||
| #endif | ||
| bool value = TEST(nzcv, 1U << pos); | ||
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| for (i = 0; i < NUM_FLAGS; i++) { | ||
| if (nzcv_pos[i] == pos) | ||
| flag = flags[i]; | ||
| } | ||
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| if (value != set) | ||
| print("ERROR %d %s\n", set, flag); | ||
| else | ||
| print("OK %d %s\n", set, flag); | ||
| } | ||
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| int | ||
| main() | ||
| { | ||
| uint i; | ||
| INIT(); | ||
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| for (i = 0; i < NUM_FLAGS; i++) { | ||
| test_nzcv_pos(nzcv_pos[i]); | ||
| } | ||
| } | ||
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| #else /* asm code *************************************************************/ | ||
| #include "asm_defines.asm" | ||
| START_FILE | ||
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| DECL_EXTERN(test_flag) | ||
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| #define FUNCNAME test_nzcv_pos | ||
| DECLARE_FUNC(FUNCNAME) | ||
| GLOBAL_LABEL(FUNCNAME:) | ||
| mov x19, ARG1 | ||
| mov x20, x30 | ||
| CALLC1(GLOBAL_REF(set_flag), x19) | ||
| mrs x0, nzcv | ||
| mov w1, w19 | ||
| CALLC3(GLOBAL_REF(test_flag), x0, x1, 1) | ||
| CALLC1(GLOBAL_REF(clear_flag), x19) | ||
| mrs x0, nzcv | ||
| mov w1, w19 | ||
| CALLC3(GLOBAL_REF(test_flag), x0, x1, 0) | ||
| mov x30, x20 | ||
| ret | ||
| END_FUNC(FUNCNAME) | ||
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| /* void set_flag(uint pos) */ | ||
| #undef FUNCNAME | ||
| #define FUNCNAME set_flag | ||
| DECLARE_FUNC(FUNCNAME) | ||
| GLOBAL_LABEL(FUNCNAME:) | ||
| mov w1, #1 | ||
| lsl w1, w1, w0 | ||
| mrs x0, nzcv | ||
| orr w0, w0, w1 | ||
| msr nzcv, x0 | ||
| ret | ||
| END_FUNC(FUNCNAME) | ||
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| /* void clear_flag(uint pos) */ | ||
| #undef FUNCNAME | ||
| #define FUNCNAME clear_flag | ||
| DECLARE_FUNC(FUNCNAME) | ||
| GLOBAL_LABEL(FUNCNAME:) | ||
| mov w1, #1 | ||
| lsl w1, w1, w0 | ||
| mvn w1, w1 | ||
| mrs x0, nzcv | ||
| and w0, w0, w1 | ||
| msr nzcv, x0 | ||
| ret | ||
| END_FUNC(FUNCNAME) | ||
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| END_FILE | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| OK 1 N | ||
| OK 0 N | ||
| OK 1 Z | ||
| OK 0 Z | ||
| OK 1 C | ||
| OK 0 C | ||
| OK 1 V | ||
| OK 0 V |