dmake: do not set MAKEFLAGS=k

[unleashed/tickless.git] / usr / src / common / elfcap / elfcap.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2015, Joyent, Inc.
 */

/* LINTLIBRARY */

/*
 * String conversion routine for hardware capabilities types.
 */
#include        <strings.h>
#include        <stdio.h>
#include        <ctype.h>
#include        <sys/machelf.h>
#include        <sys/elf.h>
#include        <sys/auxv_SPARC.h>
#include        <sys/auxv_386.h>
#include        <elfcap.h>

/*
 * Given a literal string, generate an initialization for an
 * elfcap_str_t value.
 */
#define STRDESC(_str) { _str, sizeof (_str) - 1 }

/*
 * The items in the elfcap_desc_t arrays are required to be
 * ordered so that the array index is related to the
 * c_val field as:
 *
 *      array[ndx].c_val = 2^ndx
 *
 * meaning that
 *
 *      array[0].c_val = 2^0 = 1
 *      array[1].c_val = 2^1 = 2
 *      array[2].c_val = 2^2 = 4
 *      .
 *      .
 *      .
 *
 * Since 0 is not a valid value for the c_val field, we use it to
 * mark an array entry that is a placeholder. This can happen if there
 * is a hole in the assigned bits.
 *
 * The RESERVED_ELFCAP_DESC macro is used to reserve such holes.
 */
#define RESERVED_ELFCAP_DESC { 0, { NULL, 0 }, { NULL, 0 }, { NULL, 0 } }

/*
 * Define separators for output string processing. This must be kept in
 * sync with the elfcap_fmt_t values in elfcap.h.
 */
static const elfcap_str_t format[] = {
        STRDESC(" "),                   /* ELFCAP_FMT_SNGSPACE */
        STRDESC("  "),                  /* ELFCAP_FMT_DBLSPACE */
        STRDESC(" | ")                  /* ELFCAP_FMT_PIPSPACE */
};
#define FORMAT_NELTS    (sizeof (format) / sizeof (format[0]))



/*
 * Define all known software capabilities in all the supported styles.
 * Order the capabilities by their numeric value. See SF1_SUNW_
 * values in sys/elf.h.
 */
static const elfcap_desc_t sf1[ELFCAP_NUM_SF1] = {
        {                                               /* 0x00000001 */
                SF1_SUNW_FPKNWN, STRDESC("SF1_SUNW_FPKNWN"),
                STRDESC("FPKNWN"), STRDESC("fpknwn")
        },
        {                                               /* 0x00000002 */
                SF1_SUNW_FPUSED, STRDESC("SF1_SUNW_FPUSED"),
                STRDESC("FPUSED"), STRDESC("fpused"),
        },
        {                                               /* 0x00000004 */
                SF1_SUNW_ADDR32, STRDESC("SF1_SUNW_ADDR32"),
                STRDESC("ADDR32"), STRDESC("addr32"),
        }
};



/*
 * Order the SPARC hardware capabilities to match their numeric value.  See
 * AV_SPARC_ values in sys/auxv_SPARC.h.
 */
static const elfcap_desc_t hw1_sparc[ELFCAP_NUM_HW1_SPARC] = {
        {                                               /* 0x00000001 */
                AV_SPARC_MUL32, STRDESC("AV_SPARC_MUL32"),
                STRDESC("MUL32"), STRDESC("mul32"),
        },
        {                                               /* 0x00000002 */
                AV_SPARC_DIV32, STRDESC("AV_SPARC_DIV32"),
                STRDESC("DIV32"), STRDESC("div32"),
        },
        {                                               /* 0x00000004 */
                AV_SPARC_FSMULD, STRDESC("AV_SPARC_FSMULD"),
                STRDESC("FSMULD"), STRDESC("fsmuld"),
        },
        {                                               /* 0x00000008 */
                AV_SPARC_V8PLUS, STRDESC("AV_SPARC_V8PLUS"),
                STRDESC("V8PLUS"), STRDESC("v8plus"),
        },
        {                                               /* 0x00000010 */
                AV_SPARC_POPC, STRDESC("AV_SPARC_POPC"),
                STRDESC("POPC"), STRDESC("popc"),
        },
        {                                               /* 0x00000020 */
                AV_SPARC_VIS, STRDESC("AV_SPARC_VIS"),
                STRDESC("VIS"), STRDESC("vis"),
        },
        {                                               /* 0x00000040 */
                AV_SPARC_VIS2, STRDESC("AV_SPARC_VIS2"),
                STRDESC("VIS2"), STRDESC("vis2"),
        },
        {                                               /* 0x00000080 */
                AV_SPARC_ASI_BLK_INIT, STRDESC("AV_SPARC_ASI_BLK_INIT"),
                STRDESC("ASI_BLK_INIT"), STRDESC("asi_blk_init"),
        },
        {                                               /* 0x00000100 */
                AV_SPARC_FMAF, STRDESC("AV_SPARC_FMAF"),
                STRDESC("FMAF"), STRDESC("fmaf"),
        },
        RESERVED_ELFCAP_DESC,                           /* 0x00000200 */
        {                                               /* 0x00000400 */
                AV_SPARC_VIS3, STRDESC("AV_SPARC_VIS3"),
                STRDESC("VIS3"), STRDESC("vis3"),
        },
        {                                               /* 0x00000800 */
                AV_SPARC_HPC, STRDESC("AV_SPARC_HPC"),
                STRDESC("HPC"), STRDESC("hpc"),
        },
        {                                               /* 0x00001000 */
                AV_SPARC_RANDOM, STRDESC("AV_SPARC_RANDOM"),
                STRDESC("RANDOM"), STRDESC("random"),
        },
        {                                               /* 0x00002000 */
                AV_SPARC_TRANS, STRDESC("AV_SPARC_TRANS"),
                STRDESC("TRANS"), STRDESC("trans"),
        },
        {                                               /* 0x00004000 */
                AV_SPARC_FJFMAU, STRDESC("AV_SPARC_FJFMAU"),
                STRDESC("FJFMAU"), STRDESC("fjfmau"),
        },
        {                                               /* 0x00008000 */
                AV_SPARC_IMA, STRDESC("AV_SPARC_IMA"),
                STRDESC("IMA"), STRDESC("ima"),
        },
        {                                               /* 0x00010000 */
                AV_SPARC_ASI_CACHE_SPARING,
                STRDESC("AV_SPARC_ASI_CACHE_SPARING"),
                STRDESC("CSPARE"), STRDESC("cspare"),
        }
};



/*
 * Order the Intel hardware capabilities to match their numeric value.  See
 * AV_386_ values in sys/auxv_386.h.
 */
static const elfcap_desc_t hw1_386[ELFCAP_NUM_HW1_386] = {
        {                                               /* 0x00000001 */
                AV_386_FPU, STRDESC("AV_386_FPU"),
                STRDESC("FPU"), STRDESC("fpu"),
        },
        {                                               /* 0x00000002 */
                AV_386_TSC, STRDESC("AV_386_TSC"),
                STRDESC("TSC"), STRDESC("tsc"),
        },
        {                                               /* 0x00000004 */
                AV_386_CX8, STRDESC("AV_386_CX8"),
                STRDESC("CX8"), STRDESC("cx8"),
        },
        {                                               /* 0x00000008 */
                AV_386_SEP, STRDESC("AV_386_SEP"),
                STRDESC("SEP"), STRDESC("sep"),
        },
        {                                               /* 0x00000010 */
                AV_386_AMD_SYSC, STRDESC("AV_386_AMD_SYSC"),
                STRDESC("AMD_SYSC"), STRDESC("amd_sysc"),
        },
        {                                               /* 0x00000020 */
                AV_386_CMOV, STRDESC("AV_386_CMOV"),
                STRDESC("CMOV"), STRDESC("cmov"),
        },
        {                                               /* 0x00000040 */
                AV_386_MMX, STRDESC("AV_386_MMX"),
                STRDESC("MMX"), STRDESC("mmx"),
        },
        {                                               /* 0x00000080 */
                AV_386_AMD_MMX, STRDESC("AV_386_AMD_MMX"),
                STRDESC("AMD_MMX"), STRDESC("amd_mmx"),
        },
        {                                               /* 0x00000100 */
                AV_386_AMD_3DNow, STRDESC("AV_386_AMD_3DNow"),
                STRDESC("AMD_3DNow"), STRDESC("amd_3dnow"),
        },
        {                                               /* 0x00000200 */
                AV_386_AMD_3DNowx, STRDESC("AV_386_AMD_3DNowx"),
                STRDESC("AMD_3DNowx"), STRDESC("amd_3dnowx"),
        },
        {                                               /* 0x00000400 */
                AV_386_FXSR, STRDESC("AV_386_FXSR"),
                STRDESC("FXSR"), STRDESC("fxsr"),
        },
        {                                               /* 0x00000800 */
                AV_386_SSE, STRDESC("AV_386_SSE"),
                STRDESC("SSE"), STRDESC("sse"),
        },
        {                                               /* 0x00001000 */
                AV_386_SSE2, STRDESC("AV_386_SSE2"),
                STRDESC("SSE2"), STRDESC("sse2"),
        },
        /* 0x02000 withdrawn - do not assign */
        {                                               /* 0x00004000 */
                AV_386_SSE3, STRDESC("AV_386_SSE3"),
                STRDESC("SSE3"), STRDESC("sse3"),
        },
        /* 0x08000 withdrawn - do not assign */
        {                                               /* 0x00010000 */
                AV_386_CX16, STRDESC("AV_386_CX16"),
                STRDESC("CX16"), STRDESC("cx16"),
        },
        {                                               /* 0x00020000 */
                AV_386_AHF, STRDESC("AV_386_AHF"),
                STRDESC("AHF"), STRDESC("ahf"),
        },
        {                                               /* 0x00040000 */
                AV_386_TSCP, STRDESC("AV_386_TSCP"),
                STRDESC("TSCP"), STRDESC("tscp"),
        },
        {                                               /* 0x00080000 */
                AV_386_AMD_SSE4A, STRDESC("AV_386_AMD_SSE4A"),
                STRDESC("AMD_SSE4A"), STRDESC("amd_sse4a"),
        },
        {                                               /* 0x00100000 */
                AV_386_POPCNT, STRDESC("AV_386_POPCNT"),
                STRDESC("POPCNT"), STRDESC("popcnt"),
        },
        {                                               /* 0x00200000 */
                AV_386_AMD_LZCNT, STRDESC("AV_386_AMD_LZCNT"),
                STRDESC("AMD_LZCNT"), STRDESC("amd_lzcnt"),
        },
        {                                               /* 0x00400000 */
                AV_386_SSSE3, STRDESC("AV_386_SSSE3"),
                STRDESC("SSSE3"), STRDESC("ssse3"),
        },
        {                                               /* 0x00800000 */
                AV_386_SSE4_1, STRDESC("AV_386_SSE4_1"),
                STRDESC("SSE4.1"), STRDESC("sse4.1"),
        },
        {                                               /* 0x01000000 */
                AV_386_SSE4_2, STRDESC("AV_386_SSE4_2"),
                STRDESC("SSE4.2"), STRDESC("sse4.2"),
        },
        {                                               /* 0x02000000 */
                AV_386_MOVBE, STRDESC("AV_386_MOVBE"),
                STRDESC("MOVBE"), STRDESC("movbe"),
        },
        {                                               /* 0x04000000 */
                AV_386_AES, STRDESC("AV_386_AES"),
                STRDESC("AES"), STRDESC("aes"),
        },
        {                                               /* 0x08000000 */
                AV_386_PCLMULQDQ, STRDESC("AV_386_PCLMULQDQ"),
                STRDESC("PCLMULQDQ"), STRDESC("pclmulqdq"),
        },
        {                                               /* 0x10000000 */
                AV_386_XSAVE, STRDESC("AV_386_XSAVE"),
                STRDESC("XSAVE"), STRDESC("xsave"),
        },
        {                                               /* 0x20000000 */
                AV_386_AVX, STRDESC("AV_386_AVX"),
                STRDESC("AVX"), STRDESC("avx"),
        },
        {                                               /* 0x40000000 */
                AV_386_VMX, STRDESC("AV_386_VMX"),
                STRDESC("VMX"), STRDESC("vmx"),
        },
        {                                               /* 0x80000000 */
                AV_386_AMD_SVM, STRDESC("AV_386_AMD_SVM"),
                STRDESC("AMD_SVM"), STRDESC("amd_svm"),
        }
};

static const elfcap_desc_t hw2_386[ELFCAP_NUM_HW2_386] = {
        {                                               /* 0x00000001 */
                AV_386_2_F16C, STRDESC("AV_386_2_F16C"),
                STRDESC("F16C"), STRDESC("f16c"),
        },
        {                                               /* 0x00000002 */
                AV_386_2_RDRAND, STRDESC("AV_386_2_RDRAND"),
                STRDESC("RDRAND"), STRDESC("rdrand"),
        },
        {                                               /* 0x00000004 */
                AV_386_2_BMI1, STRDESC("AV_386_2_BMI1"),
                STRDESC("BMI1"), STRDESC("bmi1"),
        },
        {                                               /* 0x00000008 */
                AV_386_2_BMI2, STRDESC("AV_386_2_BMI2"),
                STRDESC("BMI2"), STRDESC("bmi2"),
        },
        {                                               /* 0x00000010 */
                AV_386_2_FMA, STRDESC("AV_386_2_FMA"),
                STRDESC("FMA"), STRDESC("fma"),
        },
        {                                               /* 0x00000020 */
                AV_386_2_AVX2, STRDESC("AV_386_2_AVX2"),
                STRDESC("AVX2"), STRDESC("avx2"),
        },
        {                                               /* 0x00000040 */
                AV_386_2_ADX, STRDESC("AV_386_2_ADX"),
                STRDESC("ADX"), STRDESC("adx"),
        },
        {                                               /* 0x00000080 */
                AV_386_2_RDSEED, STRDESC("AV_386_2_RDSEED"),
                STRDESC("RDSEED"), STRDESC("rdseed"),
        }
};

/*
 * Concatenate a token to the string buffer.  This can be a capabilities token
 * or a separator token.
 */
static elfcap_err_t
token(char **ostr, size_t *olen, const elfcap_str_t *nstr)
{
        if (*olen < nstr->s_len)
                return (ELFCAP_ERR_BUFOVFL);

        (void) strcat(*ostr, nstr->s_str);
        *ostr += nstr->s_len;
        *olen -= nstr->s_len;

        return (ELFCAP_ERR_NONE);
}

static elfcap_err_t
get_str_desc(elfcap_style_t style, const elfcap_desc_t *cdp,
    const elfcap_str_t **ret_str)
{
        switch (ELFCAP_STYLE_MASK(style)) {
        case ELFCAP_STYLE_FULL:
                *ret_str = &cdp->c_full;
                break;
        case ELFCAP_STYLE_UC:
                *ret_str = &cdp->c_uc;
                break;
        case ELFCAP_STYLE_LC:
                *ret_str = &cdp->c_lc;
                break;
        default:
                return (ELFCAP_ERR_INVSTYLE);
        }

        return (ELFCAP_ERR_NONE);
}


/*
 * Expand a capabilities value into the strings defined in the associated
 * capabilities descriptor.
 */
static elfcap_err_t
expand(elfcap_style_t style, elfcap_mask_t val, const elfcap_desc_t *cdp,
    uint_t cnum, char *str, size_t slen, elfcap_fmt_t fmt)
{
        uint_t                  cnt;
        int                     follow = 0, err;
        const elfcap_str_t      *nstr;

        if (val == 0)
                return (ELFCAP_ERR_NONE);

        for (cnt = cnum; cnt > 0; cnt--) {
                uint_t mask = cdp[cnt - 1].c_val;

                if ((val & mask) != 0) {
                        if (follow++ && ((err = token(&str, &slen,
                            &format[fmt])) != ELFCAP_ERR_NONE))
                                return (err);

                        err = get_str_desc(style, &cdp[cnt - 1], &nstr);
                        if (err != ELFCAP_ERR_NONE)
                                return (err);
                        if ((err = token(&str, &slen, nstr)) != ELFCAP_ERR_NONE)
                                return (err);

                        val = val & ~mask;
                }
        }

        /*
         * If there are any unknown bits remaining display the numeric value.
         */
        if (val) {
                if (follow && ((err = token(&str, &slen, &format[fmt])) !=
                    ELFCAP_ERR_NONE))
                        return (err);

                (void) snprintf(str, slen, "0x%x", val);
        }
        return (ELFCAP_ERR_NONE);
}

/*
 * Expand a CA_SUNW_HW_1 value.
 */
elfcap_err_t
elfcap_hw1_to_str(elfcap_style_t style, elfcap_mask_t val, char *str,
    size_t len, elfcap_fmt_t fmt, ushort_t mach)
{
        /*
         * Initialize the string buffer, and validate the format request.
         */
        *str = '\0';
        if ((fmt < 0) || (fmt >= FORMAT_NELTS))
                return (ELFCAP_ERR_INVFMT);

        if ((mach == EM_386) || (mach == EM_IA_64) || (mach == EM_AMD64))
                return (expand(style, val, &hw1_386[0], ELFCAP_NUM_HW1_386,
                    str, len, fmt));

        if ((mach == EM_SPARC) || (mach == EM_SPARC32PLUS) ||
            (mach == EM_SPARCV9))
                return (expand(style, val, hw1_sparc, ELFCAP_NUM_HW1_SPARC,
                    str, len, fmt));

        return (ELFCAP_ERR_UNKMACH);
}

/*
 * Expand a CA_SUNW_HW_2 value.
 */
elfcap_err_t
elfcap_hw2_to_str(elfcap_style_t style, elfcap_mask_t val, char *str,
    size_t len, elfcap_fmt_t fmt, ushort_t mach)
{
        /*
         * Initialize the string buffer, and validate the format request.
         */
        *str = '\0';
        if ((fmt < 0) || (fmt >= FORMAT_NELTS))
                return (ELFCAP_ERR_INVFMT);

        if ((mach == EM_386) || (mach == EM_IA_64) || (mach == EM_AMD64))
                return (expand(style, val, &hw2_386[0], ELFCAP_NUM_HW2_386,
                    str, len, fmt));

        return (expand(style, val, NULL, 0, str, len, fmt));
}

/*
 * Expand a CA_SUNW_SF_1 value.  Note, that at present these capabilities are
 * common across all platforms.  The use of "mach" is therefore redundant, but
 * is retained for compatibility with the interface of elfcap_hw1_to_str(), and
 * possible future expansion.
 */
elfcap_err_t
/* ARGSUSED4 */
elfcap_sf1_to_str(elfcap_style_t style, elfcap_mask_t val, char *str,
    size_t len, elfcap_fmt_t fmt, ushort_t mach)
{
        /*
         * Initialize the string buffer, and validate the format request.
         */
        *str = '\0';
        if ((fmt < 0) || (fmt >= FORMAT_NELTS))
                return (ELFCAP_ERR_INVFMT);

        return (expand(style, val, &sf1[0], ELFCAP_NUM_SF1, str, len, fmt));
}

/*
 * Given a capability tag type and value, map it to a string representation.
 */
elfcap_err_t
elfcap_tag_to_str(elfcap_style_t style, uint64_t tag, elfcap_mask_t val,
    char *str, size_t len, elfcap_fmt_t fmt, ushort_t mach)
{
        switch (tag) {
        case CA_SUNW_HW_1:
                return (elfcap_hw1_to_str(style, val, str, len, fmt, mach));

        case CA_SUNW_SF_1:
                return (elfcap_sf1_to_str(style, val, str, len, fmt, mach));

        case CA_SUNW_HW_2:
                return (elfcap_hw2_to_str(style, val, str, len, fmt, mach));

        }

        return (ELFCAP_ERR_UNKTAG);
}

/*
 * Determine a capabilities value from a capabilities string.
 */
static elfcap_mask_t
value(elfcap_style_t style, const char *str, const elfcap_desc_t *cdp,
    uint_t cnum)
{
        const elfcap_str_t      *nstr;
        uint_t  num;
        int     err;

        for (num = 0; num < cnum; num++) {
                /*
                 * Skip "reserved" bits. These are unassigned bits in the
                 * middle of the assigned range.
                 */
                if (cdp[num].c_val == 0)
                        continue;

                if ((err = get_str_desc(style, &cdp[num], &nstr)) != 0)
                        return (err);
                if (style & ELFCAP_STYLE_F_ICMP) {
                        if (strcasecmp(str, nstr->s_str) == 0)
                                return (cdp[num].c_val);
                } else {
                        if (strcmp(str, nstr->s_str) == 0)
                                return (cdp[num].c_val);
                }
        }

        return (0);
}

elfcap_mask_t
elfcap_sf1_from_str(elfcap_style_t style, const char *str, ushort_t mach)
{
        return (value(style, str, &sf1[0], ELFCAP_NUM_SF1));
}

elfcap_mask_t
elfcap_hw1_from_str(elfcap_style_t style, const char *str, ushort_t mach)
{
        if ((mach == EM_386) || (mach == EM_IA_64) || (mach == EM_AMD64))
                return (value(style, str, &hw1_386[0], ELFCAP_NUM_HW1_386));

        if ((mach == EM_SPARC) || (mach == EM_SPARC32PLUS) ||
            (mach == EM_SPARCV9))
                return (value(style, str, hw1_sparc, ELFCAP_NUM_HW1_SPARC));

        return (0);
}
elfcap_mask_t
elfcap_hw2_from_str(elfcap_style_t style, const char *str, ushort_t mach)
{
        if ((mach == EM_386) || (mach == EM_IA_64) || (mach == EM_AMD64))
                return (value(style, str, &hw2_386[0], ELFCAP_NUM_HW2_386));

        return (0);
}

/*
 * Given a capability tag type and value, return the capabilities values
 * contained in the string.
 */
elfcap_mask_t
elfcap_tag_from_str(elfcap_style_t style, uint64_t tag, const char *str,
    ushort_t mach)
{
        switch (tag) {
        case CA_SUNW_HW_1:
                return (elfcap_hw1_from_str(style, str, mach));

        case CA_SUNW_SF_1:
                return (elfcap_sf1_from_str(style, str, mach));

        case CA_SUNW_HW_2:
                return (elfcap_hw2_from_str(style, str, mach));
        }

        return (0);
}

/*
 * These functions allow the caller to get direct access to the
 * cap descriptors.
 */
const elfcap_desc_t *
elfcap_getdesc_hw1_sparc(void)
{
        return (hw1_sparc);
}

const elfcap_desc_t *
elfcap_getdesc_hw1_386(void)
{
        return (hw1_386);
}

const elfcap_desc_t *
elfcap_getdesc_sf1(void)
{
        return (sf1);
}