87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (c) 2016 Philip Guenther <guenther@openbsd.org>
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* Copyright (c) 2016 Stuart Henderson <sthen@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static inline void
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showreg(const char *reg, unsigned value, int show_ascii)
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{
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unsigned char c;
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printf("%s = 0x%08x % 10u", reg, value, value);
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if (show_ascii) {
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fputs(" \"", stdout);
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c = value & 0xff; putchar(isprint(c) ? c : '?');
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c = (value >> 8) & 0xff; putchar(isprint(c) ? c : '?');
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c = (value >> 16) & 0xff; putchar(isprint(c) ? c : '?');
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c = (value >> 24) & 0xff; putchar(isprint(c) ? c : '?');
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putchar('"');
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}
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putchar('\n');
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}
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int
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main(int argc, char **argv)
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{
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unsigned long code, leaf;
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unsigned int a, b, c, d;
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leaf = 0;
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switch (argc) {
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case 3:
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errno = 0;
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/* strtoul() to both dec and hex input */
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leaf = strtoul(argv[2], NULL, 0);
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if (leaf == ULONG_MAX && errno == ERANGE || leaf > UINT_MAX)
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errx(1, "cpuid leaf out of range: %s", argv[2]);
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/* FALLTHROUGH */
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case 2:
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errno = 0;
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code = strtoul(argv[1], NULL, 0);
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if (code == ULONG_MAX && errno == ERANGE || code > UINT_MAX)
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errx(1, "cpuid code out of range: %s", argv[1]);
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break;
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default:
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printf("usage: cpuid code [leaf]\n");
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exit(1);
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}
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/*
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* The dance here with %ebx is to work around a gcc bug on i386,
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* where gcc uses %ebx for PIC/PIE code but fail to save/reload
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* it around __asm() blocks that use %ebx. Oddly, if you declare
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* that the __asm() *clobbers* ebx, gcc complains.
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* Anyway, this dance is unnecessary but harmless on amd64.
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*/
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__asm volatile("mov %%ebx, %%esi; cpuid; xchg %%esi, %%ebx"
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: "=a" (a), "=S" (b), "=c" (c), "=d" (d)
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: "a" (code), "c" (leaf));
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showreg("eax", a, 1);
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showreg("ebx", b, 1);
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showreg("ecx", c, 1);
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showreg("edx", d, 1);
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//getc(stdin);
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return 0;
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}
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