/* This testcase is part of GDB, the GNU debugger. Copyright 2017-2020 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include #include /* 0 if the CPU supports rdrand and non-zero otherwise. */ static unsigned int supports_rdrand; /* 0 if the CPU supports rdseed and non-zero otherwise. */ static unsigned int supports_rdseed; /* Check supported features and set globals accordingly. The globals can be used to prevent unsupported tests from running. */ static void check_supported_features (void) { unsigned int rdrand_mask = (1 << 30); unsigned int rdseed_mask = (1 << 18); unsigned int eax, ebx, ecx, edx; unsigned int vendor; unsigned int max_level; max_level = __get_cpuid_max (0, &vendor); if (max_level < 1) return; __cpuid (1, eax, ebx, ecx, edx); supports_rdrand = ((ecx & rdrand_mask) == rdrand_mask); if (max_level >= 7) { __cpuid_count (7, 0, eax, ebx, ecx, edx); supports_rdseed = ((ebx & rdseed_mask) == rdseed_mask); } } /* Test rdrand support for various output registers. */ void rdrand (void) { /* Get a random number from the rdrand assembly instruction. */ register uint64_t number; if (!supports_rdrand) return; /* 16-bit random numbers. */ __asm__ volatile ("rdrand %%ax;" : "=r" (number)); __asm__ volatile ("rdrand %%bx;" : "=r" (number)); __asm__ volatile ("rdrand %%cx;" : "=r" (number)); __asm__ volatile ("rdrand %%dx;" : "=r" (number)); __asm__ volatile ("mov %%di, %%ax;" : "=r" (number)); __asm__ volatile ("rdrand %%di;" : "=r" (number)); __asm__ volatile ("mov %%ax, %%di;" : "=r" (number)); __asm__ volatile ("mov %%si, %%ax;" : "=r" (number)); __asm__ volatile ("rdrand %%si;" : "=r" (number)); __asm__ volatile ("mov %%ax, %%si;" : "=r" (number)); __asm__ volatile ("mov %%bp, %%ax;" : "=r" (number)); __asm__ volatile ("rdrand %%bp;" : "=r" (number)); __asm__ volatile ("mov %%ax, %%bp;" : "=r" (number)); __asm__ volatile ("mov %%sp, %%ax;" : "=r" (number)); __asm__ volatile ("rdrand %%sp;" : "=r" (number)); __asm__ volatile ("mov %%ax, %%sp;" : "=r" (number)); __asm__ volatile ("rdrand %%r8w;" : "=r" (number)); __asm__ volatile ("rdrand %%r9w;" : "=r" (number)); __asm__ volatile ("rdrand %%r10w;" : "=r" (number)); __asm__ volatile ("rdrand %%r11w;" : "=r" (number)); __asm__ volatile ("rdrand %%r12w;" : "=r" (number)); __asm__ volatile ("rdrand %%r13w;" : "=r" (number)); __asm__ volatile ("rdrand %%r14w;" : "=r" (number)); __asm__ volatile ("rdrand %%r15w;" : "=r" (number)); /* 32-bit random numbers. */ __asm__ volatile ("rdrand %%eax;" : "=r" (number)); __asm__ volatile ("rdrand %%ebx;" : "=r" (number)); __asm__ volatile ("rdrand %%ecx;" : "=r" (number)); __asm__ volatile ("rdrand %%edx;" : "=r" (number)); __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%edi;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (number)); __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%esi;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (number)); __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%ebp;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (number)); __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%esp;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (number)); __asm__ volatile ("rdrand %%r8d;" : "=r" (number)); __asm__ volatile ("rdrand %%r9d;" : "=r" (number)); __asm__ volatile ("rdrand %%r10d;" : "=r" (number)); __asm__ volatile ("rdrand %%r11d;" : "=r" (number)); __asm__ volatile ("rdrand %%r12d;" : "=r" (number)); __asm__ volatile ("rdrand %%r13d;" : "=r" (number)); __asm__ volatile ("rdrand %%r14d;" : "=r" (number)); __asm__ volatile ("rdrand %%r15d;" : "=r" (number)); /* 64-bit random numbers. */ __asm__ volatile ("rdrand %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%rbx;" : "=r" (number)); __asm__ volatile ("rdrand %%rcx;" : "=r" (number)); __asm__ volatile ("rdrand %%rdx;" : "=r" (number)); __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%rdi;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (number)); __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%rsi;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (number)); __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%rbp;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (number)); __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (number)); __asm__ volatile ("rdrand %%rsp;" : "=r" (number)); __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (number)); __asm__ volatile ("rdrand %%r8;" : "=r" (number)); __asm__ volatile ("rdrand %%r9;" : "=r" (number)); __asm__ volatile ("rdrand %%r10;" : "=r" (number)); __asm__ volatile ("rdrand %%r11;" : "=r" (number)); __asm__ volatile ("rdrand %%r12;" : "=r" (number)); __asm__ volatile ("rdrand %%r13;" : "=r" (number)); __asm__ volatile ("rdrand %%r14;" : "=r" (number)); __asm__ volatile ("rdrand %%r15;" : "=r" (number)); } /* Test rdseed support for various output registers. */ void rdseed (void) { /* Get a random seed from the rdseed assembly instruction. */ register long seed; if (!supports_rdseed) return; /* 16-bit random seeds. */ __asm__ volatile ("rdseed %%ax;" : "=r" (seed)); __asm__ volatile ("rdseed %%bx;" : "=r" (seed)); __asm__ volatile ("rdseed %%cx;" : "=r" (seed)); __asm__ volatile ("rdseed %%dx;" : "=r" (seed)); __asm__ volatile ("mov %%di, %%ax;" : "=r" (seed)); __asm__ volatile ("rdseed %%di;" : "=r" (seed)); __asm__ volatile ("mov %%ax, %%di;" : "=r" (seed)); __asm__ volatile ("mov %%si, %%ax;" : "=r" (seed)); __asm__ volatile ("rdseed %%si;" : "=r" (seed)); __asm__ volatile ("mov %%ax, %%si;" : "=r" (seed)); __asm__ volatile ("mov %%bp, %%ax;" : "=r" (seed)); __asm__ volatile ("rdseed %%bp;" : "=r" (seed)); __asm__ volatile ("mov %%ax, %%bp;" : "=r" (seed)); __asm__ volatile ("mov %%sp, %%ax;" : "=r" (seed)); __asm__ volatile ("rdseed %%sp;" : "=r" (seed)); __asm__ volatile ("mov %%ax, %%sp;" : "=r" (seed)); __asm__ volatile ("rdseed %%r8w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r9w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r10w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r11w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r12w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r13w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r14w;" : "=r" (seed)); __asm__ volatile ("rdseed %%r15w;" : "=r" (seed)); /* 32-bit random seeds. */ __asm__ volatile ("rdseed %%eax;" : "=r" (seed)); __asm__ volatile ("rdseed %%ebx;" : "=r" (seed)); __asm__ volatile ("rdseed %%ecx;" : "=r" (seed)); __asm__ volatile ("rdseed %%edx;" : "=r" (seed)); __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%edi;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (seed)); __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%esi;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (seed)); __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%ebp;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (seed)); __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%esp;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (seed)); __asm__ volatile ("rdseed %%r8d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r9d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r10d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r11d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r12d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r13d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r14d;" : "=r" (seed)); __asm__ volatile ("rdseed %%r15d;" : "=r" (seed)); /* 64-bit random seeds. */ __asm__ volatile ("rdseed %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%rbx;" : "=r" (seed)); __asm__ volatile ("rdseed %%rcx;" : "=r" (seed)); __asm__ volatile ("rdseed %%rdx;" : "=r" (seed)); __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%rdi;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (seed)); __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%rsi;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (seed)); __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%rbp;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (seed)); __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (seed)); __asm__ volatile ("rdseed %%rsp;" : "=r" (seed)); __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (seed)); __asm__ volatile ("rdseed %%r8;" : "=r" (seed)); __asm__ volatile ("rdseed %%r9;" : "=r" (seed)); __asm__ volatile ("rdseed %%r10;" : "=r" (seed)); __asm__ volatile ("rdseed %%r11;" : "=r" (seed)); __asm__ volatile ("rdseed %%r12;" : "=r" (seed)); __asm__ volatile ("rdseed %%r13;" : "=r" (seed)); __asm__ volatile ("rdseed %%r14;" : "=r" (seed)); __asm__ volatile ("rdseed %%r15;" : "=r" (seed)); } /* Initialize arch-specific bits. */ static void initialize (void) { /* Initialize supported features. */ check_supported_features (); } /* Functions testing instruction decodings. GDB will test all of these. */ static testcase_ftype testcases[] = { rdrand, rdseed };