9f17bfdab4
In order to fully support MSA_EXT_5, we have to support the SHA-512 special instructions. So implement those. The implementation began as something TweetNacl-like, and then was adjusted to be useful here. It's not very beautiful, but it is quite short and compact, which is what we're going for. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> [ restructure, add missing exception, add comments, fixup CPU model ] Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20220922153820.221811-1-david@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
291 lines
9.0 KiB
C
291 lines
9.0 KiB
C
/*
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* s390x crypto helpers
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*
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* Copyright (C) 2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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* Copyright (c) 2017 Red Hat Inc
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*
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* Authors:
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* David Hildenbrand <david@redhat.com>
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* Jason A. Donenfeld <Jason@zx2c4.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "s390x-internal.h"
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#include "tcg_s390x.h"
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#include "exec/helper-proto.h"
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#include "exec/exec-all.h"
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#include "exec/cpu_ldst.h"
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static uint64_t R(uint64_t x, int c)
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{
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return (x >> c) | (x << (64 - c));
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}
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static uint64_t Ch(uint64_t x, uint64_t y, uint64_t z)
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{
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return (x & y) ^ (~x & z);
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}
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static uint64_t Maj(uint64_t x, uint64_t y, uint64_t z)
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{
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return (x & y) ^ (x & z) ^ (y & z);
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}
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static uint64_t Sigma0(uint64_t x)
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{
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return R(x, 28) ^ R(x, 34) ^ R(x, 39);
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}
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static uint64_t Sigma1(uint64_t x)
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{
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return R(x, 14) ^ R(x, 18) ^ R(x, 41);
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}
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static uint64_t sigma0(uint64_t x)
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{
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return R(x, 1) ^ R(x, 8) ^ (x >> 7);
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}
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static uint64_t sigma1(uint64_t x)
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{
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return R(x, 19) ^ R(x, 61) ^ (x >> 6);
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}
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static const uint64_t K[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
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0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
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0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
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0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
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0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
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0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
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0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
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0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
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0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
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0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
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0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
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0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
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0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
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0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
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0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
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0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
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0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
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0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
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0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
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0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
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0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
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};
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/* a is icv/ocv, w is a single message block. w will get reused internally. */
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static void sha512_bda(uint64_t a[8], uint64_t w[16])
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{
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uint64_t t, z[8], b[8];
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int i, j;
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memcpy(z, a, sizeof(z));
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for (i = 0; i < 80; i++) {
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memcpy(b, a, sizeof(b));
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t = a[7] + Sigma1(a[4]) + Ch(a[4], a[5], a[6]) + K[i] + w[i % 16];
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b[7] = t + Sigma0(a[0]) + Maj(a[0], a[1], a[2]);
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b[3] += t;
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for (j = 0; j < 8; ++j) {
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a[(j + 1) % 8] = b[j];
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}
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if (i % 16 == 15) {
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for (j = 0; j < 16; ++j) {
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w[j] += w[(j + 9) % 16] + sigma0(w[(j + 1) % 16]) +
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sigma1(w[(j + 14) % 16]);
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}
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}
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}
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for (i = 0; i < 8; i++) {
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a[i] += z[i];
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}
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}
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/* a is icv/ocv, w is a single message block that needs be64 conversion. */
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static void sha512_bda_be64(uint64_t a[8], uint64_t w[16])
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{
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uint64_t t[16];
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int i;
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for (i = 0; i < 16; i++) {
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t[i] = be64_to_cpu(w[i]);
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}
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sha512_bda(a, t);
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}
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static void sha512_read_icv(CPUS390XState *env, uint64_t addr,
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uint64_t a[8], uintptr_t ra)
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{
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int i;
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for (i = 0; i < 8; i++, addr += 8) {
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addr = wrap_address(env, addr);
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a[i] = cpu_ldq_be_data_ra(env, addr, ra);
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}
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}
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static void sha512_write_ocv(CPUS390XState *env, uint64_t addr,
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uint64_t a[8], uintptr_t ra)
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{
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int i;
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for (i = 0; i < 8; i++, addr += 8) {
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addr = wrap_address(env, addr);
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cpu_stq_be_data_ra(env, addr, a[i], ra);
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}
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}
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static void sha512_read_block(CPUS390XState *env, uint64_t addr,
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uint64_t a[16], uintptr_t ra)
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{
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int i;
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for (i = 0; i < 16; i++, addr += 8) {
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addr = wrap_address(env, addr);
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a[i] = cpu_ldq_be_data_ra(env, addr, ra);
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}
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}
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static void sha512_read_mbl_be64(CPUS390XState *env, uint64_t addr,
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uint8_t a[16], uintptr_t ra)
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{
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int i;
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for (i = 0; i < 16; i++, addr += 1) {
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addr = wrap_address(env, addr);
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a[i] = cpu_ldub_data_ra(env, addr, ra);
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}
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}
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static int cpacf_sha512(CPUS390XState *env, uintptr_t ra, uint64_t param_addr,
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uint64_t *message_reg, uint64_t *len_reg, uint32_t type)
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{
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enum { MAX_BLOCKS_PER_RUN = 64 }; /* Arbitrary: keep interactivity. */
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uint64_t len = *len_reg, a[8], processed = 0;
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int i, message_reg_len = 64;
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g_assert(type == S390_FEAT_TYPE_KIMD || type == S390_FEAT_TYPE_KLMD);
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if (!(env->psw.mask & PSW_MASK_64)) {
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len = (uint32_t)len;
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message_reg_len = (env->psw.mask & PSW_MASK_32) ? 32 : 24;
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}
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/* KIMD: length has to be properly aligned. */
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if (type == S390_FEAT_TYPE_KIMD && !QEMU_IS_ALIGNED(len, 128)) {
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tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra);
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}
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sha512_read_icv(env, param_addr, a, ra);
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/* Process full blocks first. */
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for (; len >= 128; len -= 128, processed += 128) {
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uint64_t w[16];
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if (processed >= MAX_BLOCKS_PER_RUN * 128) {
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break;
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}
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sha512_read_block(env, *message_reg + processed, w, ra);
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sha512_bda(a, w);
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}
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/* KLMD: Process partial/empty block last. */
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if (type == S390_FEAT_TYPE_KLMD && len < 128) {
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uint8_t x[128];
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/* Read the remainder of the message byte-per-byte. */
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for (i = 0; i < len; i++) {
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uint64_t addr = wrap_address(env, *message_reg + processed + i);
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x[i] = cpu_ldub_data_ra(env, addr, ra);
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}
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/* Pad the remainder with zero and set the top bit. */
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memset(x + len, 0, 128 - len);
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x[len] = 128;
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/*
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* Place the MBL either into this block (if there is space left),
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* or use an additional one.
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*/
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if (len < 112) {
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sha512_read_mbl_be64(env, param_addr + 64, x + 112, ra);
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}
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sha512_bda_be64(a, (uint64_t *)x);
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if (len >= 112) {
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memset(x, 0, 112);
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sha512_read_mbl_be64(env, param_addr + 64, x + 112, ra);
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sha512_bda_be64(a, (uint64_t *)x);
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}
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processed += len;
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len = 0;
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}
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/*
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* Modify memory after we read all inputs and modify registers only after
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* writing memory succeeded.
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*
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* TODO: if writing fails halfway through (e.g., when crossing page
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* boundaries), we're in trouble. We'd need something like access_prepare().
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*/
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sha512_write_ocv(env, param_addr, a, ra);
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*message_reg = deposit64(*message_reg, 0, message_reg_len,
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*message_reg + processed);
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*len_reg -= processed;
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return !len ? 0 : 3;
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}
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uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, uint32_t r2, uint32_t r3,
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uint32_t type)
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{
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const uintptr_t ra = GETPC();
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const uint8_t mod = env->regs[0] & 0x80ULL;
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const uint8_t fc = env->regs[0] & 0x7fULL;
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uint8_t subfunc[16] = { 0 };
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uint64_t param_addr;
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int i;
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switch (type) {
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case S390_FEAT_TYPE_KMAC:
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case S390_FEAT_TYPE_KIMD:
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case S390_FEAT_TYPE_KLMD:
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case S390_FEAT_TYPE_PCKMO:
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case S390_FEAT_TYPE_PCC:
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if (mod) {
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tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra);
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}
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break;
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}
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s390_get_feat_block(type, subfunc);
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if (!test_be_bit(fc, subfunc)) {
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tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra);
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}
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switch (fc) {
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case 0: /* query subfunction */
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for (i = 0; i < 16; i++) {
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param_addr = wrap_address(env, env->regs[1] + i);
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cpu_stb_data_ra(env, param_addr, subfunc[i], ra);
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}
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break;
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case 3: /* CPACF_*_SHA_512 */
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return cpacf_sha512(env, ra, env->regs[1], &env->regs[r2],
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&env->regs[r2 + 1], type);
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default:
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/* we don't implement any other subfunction yet */
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g_assert_not_reached();
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}
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return 0;
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}
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