| 1 | /* Test if POWER vscr read by ucontext. |
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| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <support/check.h> |
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| 20 | #include <sys/auxv.h> |
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| 21 | #include <ucontext.h> |
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| 22 | #include <stdlib.h> |
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| 23 | #include <stdio.h> |
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| 24 | #include <stdint.h> |
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| 25 | #include <altivec.h> |
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| 26 | |
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| 27 | #define SAT 0x1 |
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| 28 | |
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| 29 | /* This test is supported only on POWER 5 or higher. */ |
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| 30 | #define PPC_CPU_SUPPORTED (PPC_FEATURE_POWER5 | PPC_FEATURE_POWER5_PLUS \ |
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| 31 | | PPC_FEATURE_ARCH_2_05 | PPC_FEATURE_ARCH_2_06 \ |
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| 32 | | PPC_FEATURE2_ARCH_2_07) |
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| 33 | static int |
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| 34 | do_test (void) |
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| 35 | { |
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| 36 | |
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| 37 | if (!(getauxval(AT_HWCAP2) & PPC_CPU_SUPPORTED)) |
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| 38 | { |
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| 39 | if (!(getauxval(AT_HWCAP) & PPC_CPU_SUPPORTED)) |
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| 40 | FAIL_UNSUPPORTED("This test is unsupported on POWER < 5\n" ); |
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| 41 | } |
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| 42 | |
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| 43 | uint32_t vscr[4] __attribute__ ((aligned (16))); |
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| 44 | uint32_t* vscr_ptr = vscr; |
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| 45 | uint32_t vscr_word; |
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| 46 | ucontext_t ucp; |
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| 47 | __vector unsigned int v0 = {0}; |
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| 48 | __vector unsigned int v1 = {0}; |
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| 49 | |
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| 50 | /* Set SAT bit in VSCR register. */ |
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| 51 | asm volatile (".machine push;\n" |
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| 52 | ".machine \"power5\";\n" |
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| 53 | ".machine altivec;\n" |
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| 54 | "vspltisb %0,0;\n" |
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| 55 | "vspltisb %1,-1;\n" |
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| 56 | "vpkuwus %0,%0,%1;\n" |
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| 57 | "mfvscr %0;\n" |
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| 58 | "stvx %0,0,%2;\n" |
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| 59 | ".machine pop;" |
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| 60 | : "=v" (v0), "=v" (v1) |
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| 61 | : "r" (vscr_ptr) |
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| 62 | : "memory" ); |
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| 63 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 64 | vscr_word = vscr[0]; |
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| 65 | #else |
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| 66 | vscr_word = vscr[3]; |
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| 67 | #endif |
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| 68 | |
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| 69 | if ((vscr_word & SAT) != SAT) |
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| 70 | { |
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| 71 | FAIL_EXIT1("FAIL: SAT bit is not set.\n" ); |
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| 72 | } |
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| 73 | |
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| 74 | if (getcontext (ucp: &ucp)) |
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| 75 | { |
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| 76 | FAIL_EXIT1("FAIL: getcontext error\n" ); |
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| 77 | } |
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| 78 | if (ucp.uc_mcontext.v_regs->vscr.vscr_word != vscr_word) |
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| 79 | { |
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| 80 | FAIL_EXIT1("FAIL: ucontext vscr does not match with vscr\n" ); |
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| 81 | } |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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| 85 | #include <support/test-driver.c> |
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| 86 | |
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