/* * AArch64 specific helpers * * Copyright (c) 2013 Alexander Graf * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see . */ #include "qemu/osdep.h" #include "cpu.h" #include "exec/helper-proto.h" #include "qemu/host-utils.h" #include "qemu/log.h" #include "sysemu/sysemu.h" #include "qemu/bitops.h" #include "internals.h" #include "qemu/crc32c.h" #include "exec/exec-all.h" #include "exec/cpu_ldst.h" #include "qemu/int128.h" #include "tcg.h" #include "fpu/softfloat.h" /* C2.4.7 Multiply and divide */ /* special cases for 0 and LLONG_MIN are mandated by the standard */ uint64_t HELPER(udiv64)(uint64_t num, uint64_t den) { if (den == 0) { return 0; } return num / den; } int64_t HELPER(sdiv64)(int64_t num, int64_t den) { if (den == 0) { return 0; } if (num == LLONG_MIN && den == -1) { return LLONG_MIN; } return num / den; } uint64_t HELPER(rbit64)(uint64_t x) { return revbit64(x); } /* Convert a softfloat float_relation_ (as returned by * the float*_compare functions) to the correct ARM * NZCV flag state. */ static inline uint32_t float_rel_to_flags(int res) { uint64_t flags; switch (res) { case float_relation_equal: flags = PSTATE_Z | PSTATE_C; break; case float_relation_less: flags = PSTATE_N; break; case float_relation_greater: flags = PSTATE_C; break; case float_relation_unordered: default: flags = PSTATE_C | PSTATE_V; break; } return flags; } uint64_t HELPER(vfp_cmps_a64)(float32 x, float32 y, void *fp_status) { return float_rel_to_flags(float32_compare_quiet(x, y, fp_status)); } uint64_t HELPER(vfp_cmpes_a64)(float32 x, float32 y, void *fp_status) { return float_rel_to_flags(float32_compare(x, y, fp_status)); } uint64_t HELPER(vfp_cmpd_a64)(float64 x, float64 y, void *fp_status) { return float_rel_to_flags(float64_compare_quiet(x, y, fp_status)); } uint64_t HELPER(vfp_cmped_a64)(float64 x, float64 y, void *fp_status) { return float_rel_to_flags(float64_compare(x, y, fp_status)); } float32 HELPER(vfp_mulxs)(float32 a, float32 b, void *fpstp) { float_status *fpst = fpstp; if ((float32_is_zero(a) && float32_is_infinity(b)) || (float32_is_infinity(a) && float32_is_zero(b))) { /* 2.0 with the sign bit set to sign(A) XOR sign(B) */ return make_float32((1U << 30) | ((float32_val(a) ^ float32_val(b)) & (1U << 31))); } return float32_mul(a, b, fpst); } float64 HELPER(vfp_mulxd)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; if ((float64_is_zero(a) && float64_is_infinity(b)) || (float64_is_infinity(a) && float64_is_zero(b))) { /* 2.0 with the sign bit set to sign(A) XOR sign(B) */ return make_float64((1ULL << 62) | ((float64_val(a) ^ float64_val(b)) & (1ULL << 63))); } return float64_mul(a, b, fpst); } uint64_t HELPER(simd_tbl)(CPUARMState *env, uint64_t result, uint64_t indices, uint32_t rn, uint32_t numregs) { /* Helper function for SIMD TBL and TBX. We have to do the table * lookup part for the 64 bits worth of indices we're passed in. * result is the initial results vector (either zeroes for TBL * or some guest values for TBX), rn the register number where * the table starts, and numregs the number of registers in the table. * We return the results of the lookups. */ int shift; for (shift = 0; shift < 64; shift += 8) { int index = extract64(indices, shift, 8); if (index < 16 * numregs) { /* Convert index (a byte offset into the virtual table * which is a series of 128-bit vectors concatenated) * into the correct register element plus a bit offset * into that element, bearing in mind that the table * can wrap around from V31 to V0. */ int elt = (rn * 2 + (index >> 3)) % 64; int bitidx = (index & 7) * 8; uint64_t *q = aa64_vfp_qreg(env, elt >> 1); uint64_t val = extract64(q[elt & 1], bitidx, 8); result = deposit64(result, shift, 8, val); } } return result; } /* 64bit/double versions of the neon float compare functions */ uint64_t HELPER(neon_ceq_f64)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; return -float64_eq_quiet(a, b, fpst); } uint64_t HELPER(neon_cge_f64)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; return -float64_le(b, a, fpst); } uint64_t HELPER(neon_cgt_f64)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; return -float64_lt(b, a, fpst); } /* Reciprocal step and sqrt step. Note that unlike the A32/T32 * versions, these do a fully fused multiply-add or * multiply-add-and-halve. */ #define float32_two make_float32(0x40000000) #define float32_three make_float32(0x40400000) #define float32_one_point_five make_float32(0x3fc00000) #define float64_two make_float64(0x4000000000000000ULL) #define float64_three make_float64(0x4008000000000000ULL) #define float64_one_point_five make_float64(0x3FF8000000000000ULL) float32 HELPER(recpsf_f32)(float32 a, float32 b, void *fpstp) { float_status *fpst = fpstp; a = float32_squash_input_denormal(a, fpst); b = float32_squash_input_denormal(b, fpst); a = float32_chs(a); if ((float32_is_infinity(a) && float32_is_zero(b)) || (float32_is_infinity(b) && float32_is_zero(a))) { return float32_two; } return float32_muladd(a, b, float32_two, 0, fpst); } float64 HELPER(recpsf_f64)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; a = float64_squash_input_denormal(a, fpst); b = float64_squash_input_denormal(b, fpst); a = float64_chs(a); if ((float64_is_infinity(a) && float64_is_zero(b)) || (float64_is_infinity(b) && float64_is_zero(a))) { return float64_two; } return float64_muladd(a, b, float64_two, 0, fpst); } float32 HELPER(rsqrtsf_f32)(float32 a, float32 b, void *fpstp) { float_status *fpst = fpstp; a = float32_squash_input_denormal(a, fpst); b = float32_squash_input_denormal(b, fpst); a = float32_chs(a); if ((float32_is_infinity(a) && float32_is_zero(b)) || (float32_is_infinity(b) && float32_is_zero(a))) { return float32_one_point_five; } return float32_muladd(a, b, float32_three, float_muladd_halve_result, fpst); } float64 HELPER(rsqrtsf_f64)(float64 a, float64 b, void *fpstp) { float_status *fpst = fpstp; a = float64_squash_input_denormal(a, fpst); b = float64_squash_input_denormal(b, fpst); a = float64_chs(a); if ((float64_is_infinity(a) && float64_is_zero(b)) || (float64_is_infinity(b) && float64_is_zero(a))) { return float64_one_point_five; } return float64_muladd(a, b, float64_three, float_muladd_halve_result, fpst); } /* Pairwise long add: add pairs of adjacent elements into * double-width elements in the result (eg _s8 is an 8x8->16 op) */ uint64_t HELPER(neon_addlp_s8)(uint64_t a) { uint64_t nsignmask = 0x0080008000800080ULL; uint64_t wsignmask = 0x8000800080008000ULL; uint64_t elementmask = 0x00ff00ff00ff00ffULL; uint64_t tmp1, tmp2; uint64_t res, signres; /* Extract odd elements, sign extend each to a 16 bit field */ tmp1 = a & elementmask; tmp1 ^= nsignmask; tmp1 |= wsignmask; tmp1 = (tmp1 - nsignmask) ^ wsignmask; /* Ditto for the even elements */ tmp2 = (a >> 8) & elementmask; tmp2 ^= nsignmask; tmp2 |= wsignmask; tmp2 = (tmp2 - nsignmask) ^ wsignmask; /* calculate the result by summing bits 0..14, 16..22, etc, * and then adjusting the sign bits 15, 23, etc manually. * This ensures the addition can't overflow the 16 bit field. */ signres = (tmp1 ^ tmp2) & wsignmask; res = (tmp1 & ~wsignmask) + (tmp2 & ~wsignmask); res ^= signres; return res; } uint64_t HELPER(neon_addlp_u8)(uint64_t a) { uint64_t tmp; tmp = a & 0x00ff00ff00ff00ffULL; tmp += (a >> 8) & 0x00ff00ff00ff00ffULL; return tmp; } uint64_t HELPER(neon_addlp_s16)(uint64_t a) { int32_t reslo, reshi; reslo = (int32_t)(int16_t)a + (int32_t)(int16_t)(a >> 16); reshi = (int32_t)(int16_t)(a >> 32) + (int32_t)(int16_t)(a >> 48); return (uint32_t)reslo | (((uint64_t)reshi) << 32); } uint64_t HELPER(neon_addlp_u16)(uint64_t a) { uint64_t tmp; tmp = a & 0x0000ffff0000ffffULL; tmp += (a >> 16) & 0x0000ffff0000ffffULL; return tmp; } /* Floating-point reciprocal exponent - see FPRecpX in ARM ARM */ float32 HELPER(frecpx_f32)(float32 a, void *fpstp) { float_status *fpst = fpstp; uint32_t val32, sbit; int32_t exp; if (float32_is_any_nan(a)) { float32 nan = a; if (float32_is_signaling_nan(a, fpst)) { float_raise(float_flag_invalid, fpst); nan = float32_maybe_silence_nan(a, fpst); } if (fpst->default_nan_mode) { nan = float32_default_nan(fpst); } return nan; } val32 = float32_val(a); sbit = 0x80000000ULL & val32; exp = extract32(val32, 23, 8); if (exp == 0) { return make_float32(sbit | (0xfe << 23)); } else { return make_float32(sbit | (~exp & 0xff) << 23); } } float64 HELPER(frecpx_f64)(float64 a, void *fpstp) { float_status *fpst = fpstp; uint64_t val64, sbit; int64_t exp; if (float64_is_any_nan(a)) { float64 nan = a; if (float64_is_signaling_nan(a, fpst)) { float_raise(float_flag_invalid, fpst); nan = float64_maybe_silence_nan(a, fpst); } if (fpst->default_nan_mode) { nan = float64_default_nan(fpst); } return nan; } val64 = float64_val(a); sbit = 0x8000000000000000ULL & val64; exp = extract64(float64_val(a), 52, 11); if (exp == 0) { return make_float64(sbit | (0x7feULL << 52)); } else { return make_float64(sbit | (~exp & 0x7ffULL) << 52); } } float32 HELPER(fcvtx_f64_to_f32)(float64 a, CPUARMState *env) { /* Von Neumann rounding is implemented by using round-to-zero * and then setting the LSB of the result if Inexact was raised. */ float32 r; float_status *fpst = &env->vfp.fp_status; float_status tstat = *fpst; int exflags; set_float_rounding_mode(float_round_to_zero, &tstat); set_float_exception_flags(0, &tstat); r = float64_to_float32(a, &tstat); r = float32_maybe_silence_nan(r, fpst); exflags = get_float_exception_flags(&tstat); if (exflags & float_flag_inexact) { r = make_float32(float32_val(r) | 1); } exflags |= get_float_exception_flags(fpst); set_float_exception_flags(exflags, fpst); return r; } /* 64-bit versions of the CRC helpers. Note that although the operation * (and the prototypes of crc32c() and crc32() mean that only the bottom * 32 bits of the accumulator and result are used, we pass and return * uint64_t for convenience of the generated code. Unlike the 32-bit * instruction set versions, val may genuinely have 64 bits of data in it. * The upper bytes of val (above the number specified by 'bytes') must have * been zeroed out by the caller. */ uint64_t HELPER(crc32_64)(uint64_t acc, uint64_t val, uint32_t bytes) { uint8_t buf[8]; stq_le_p(buf, val); static const uint32_t iso_table[256] = { 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D }; const uint8_t* data = buf; uint32_t crc = (uint32_t)acc; while (bytes-- > 0) { crc = (crc >> 8) ^ iso_table[(crc ^ (*data++)) & 0xFF]; } return crc; /* zlib crc32 converts the accumulator and output to one's complement. */ // return crc32(acc ^ 0xffffffff, buf, bytes) ^ 0xffffffff; } uint64_t HELPER(crc32c_64)(uint64_t acc, uint64_t val, uint32_t bytes) { uint8_t buf[8]; stq_le_p(buf, val); /* Linux crc32c converts the output to one's complement. */ return crc32c(acc, buf, bytes) ^ 0xffffffff; } /* Returns 0 on success; 1 otherwise. */ uint64_t HELPER(paired_cmpxchg64_le)(CPUARMState *env, uint64_t addr, uint64_t new_lo, uint64_t new_hi) { uintptr_t ra = GETPC(); Int128 oldv, cmpv, newv; bool success; /* high and low need to be switched here because this is not actually a * 128bit store but two doublewords stored consecutively */ cmpv = int128_make128(env->exclusive_high, env->exclusive_val); newv = int128_make128(new_hi, new_lo); if (env->uc->parallel_cpus) { #ifndef CONFIG_ATOMIC128 cpu_loop_exit_atomic(ENV_GET_CPU(env), ra); #else int mem_idx = cpu_mmu_index(env, false); TCGMemOpIdx oi = make_memop_idx(MO_LEQ | MO_ALIGN_16, mem_idx); oldv = helper_atomic_cmpxchgo_le_mmu(env, addr, cmpv, newv, oi, ra); success = int128_eq(oldv, cmpv); #endif } else { uint64_t o0, o1; #ifdef CONFIG_USER_ONLY /* ??? Enforce alignment. */ uint64_t *haddr = g2h(addr); env->uc->helper_retaddr = ra; o0 = ldq_le_p(haddr + 0); o1 = ldq_le_p(haddr + 1); oldv = int128_make128(o0, o1); success = int128_eq(oldv, cmpv); if (success) { stq_le_p(haddr + 0, int128_getlo(newv)); stq_le_p(haddr + 1, int128_gethi(newv)); } env->uc->helper_retaddr = 0; #else int mem_idx = cpu_mmu_index(env, false); TCGMemOpIdx oi0 = make_memop_idx(MO_LEQ | MO_ALIGN_16, mem_idx); TCGMemOpIdx oi1 = make_memop_idx(MO_LEQ, mem_idx); o0 = helper_le_ldq_mmu(env, addr + 0, oi0, ra); o1 = helper_le_ldq_mmu(env, addr + 8, oi1, ra); oldv = int128_make128(o0, o1); success = int128_eq(oldv, cmpv); if (success) { helper_le_stq_mmu(env, addr + 0, int128_getlo(newv), oi1, ra); helper_le_stq_mmu(env, addr + 8, int128_gethi(newv), oi1, ra); } #endif } return !success; } uint64_t HELPER(paired_cmpxchg64_be)(CPUARMState *env, uint64_t addr, uint64_t new_lo, uint64_t new_hi) { uintptr_t ra = GETPC(); Int128 oldv, cmpv, newv; bool success; cmpv = int128_make128(env->exclusive_val, env->exclusive_high); newv = int128_make128(new_lo, new_hi); if (env->uc->parallel_cpus) { #ifndef CONFIG_ATOMIC128 cpu_loop_exit_atomic(ENV_GET_CPU(env), ra); #else int mem_idx = cpu_mmu_index(env, false); TCGMemOpIdx oi = make_memop_idx(MO_BEQ | MO_ALIGN_16, mem_idx); oldv = helper_atomic_cmpxchgo_be_mmu(env, addr, cmpv, newv, oi, ra); success = int128_eq(oldv, cmpv); #endif } else { uint64_t o0, o1; #ifdef CONFIG_USER_ONLY /* ??? Enforce alignment. */ uint64_t *haddr = g2h(addr); env->uc->helper_retaddr = ra; o1 = ldq_be_p(haddr + 0); o0 = ldq_be_p(haddr + 1); oldv = int128_make128(o0, o1); success = int128_eq(oldv, cmpv); if (success) { stq_be_p(haddr + 0, int128_gethi(newv)); stq_be_p(haddr + 1, int128_getlo(newv)); } env->uc->helper_retaddr = 0; #else int mem_idx = cpu_mmu_index(env, false); TCGMemOpIdx oi0 = make_memop_idx(MO_BEQ | MO_ALIGN_16, mem_idx); TCGMemOpIdx oi1 = make_memop_idx(MO_BEQ, mem_idx); o1 = helper_be_ldq_mmu(env, addr + 0, oi0, ra); o0 = helper_be_ldq_mmu(env, addr + 8, oi1, ra); oldv = int128_make128(o0, o1); success = int128_eq(oldv, cmpv); if (success) { helper_be_stq_mmu(env, addr + 0, int128_gethi(newv), oi1, ra); helper_be_stq_mmu(env, addr + 8, int128_getlo(newv), oi1, ra); } #endif } return !success; }