mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-25 01:05:38 +00:00
3183349f1c
The psuedocode in aarch64/functions/pac/auth/Auth and aarch64/functions/pac/strip/Strip always uses bit 55 for extfield and do not consider if the current regime has 2 ranges. Backports commit 7eeb4c2ce8dc0a5655526f3f39bd5d6cc02efb39 from qemu
495 lines
14 KiB
C
495 lines
14 KiB
C
/*
|
|
* ARM v8.3-PAuth Operations
|
|
*
|
|
* Copyright (c) 2019 Linaro, Ltd.
|
|
*
|
|
* 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 <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "cpu.h"
|
|
#include "internals.h"
|
|
#include "exec/exec-all.h"
|
|
#include "exec/cpu_ldst.h"
|
|
#include "exec/helper-proto.h"
|
|
#include "tcg/tcg-gvec-desc.h"
|
|
|
|
|
|
static uint64_t pac_cell_shuffle(uint64_t i)
|
|
{
|
|
uint64_t o = 0;
|
|
|
|
o |= extract64(i, 52, 4);
|
|
o |= extract64(i, 24, 4) << 4;
|
|
o |= extract64(i, 44, 4) << 8;
|
|
o |= extract64(i, 0, 4) << 12;
|
|
|
|
o |= extract64(i, 28, 4) << 16;
|
|
o |= extract64(i, 48, 4) << 20;
|
|
o |= extract64(i, 4, 4) << 24;
|
|
o |= extract64(i, 40, 4) << 28;
|
|
|
|
o |= extract64(i, 32, 4) << 32;
|
|
o |= extract64(i, 12, 4) << 36;
|
|
o |= extract64(i, 56, 4) << 40;
|
|
o |= extract64(i, 20, 4) << 44;
|
|
|
|
o |= extract64(i, 8, 4) << 48;
|
|
o |= extract64(i, 36, 4) << 52;
|
|
o |= extract64(i, 16, 4) << 56;
|
|
o |= extract64(i, 60, 4) << 60;
|
|
|
|
return o;
|
|
}
|
|
|
|
static uint64_t pac_cell_inv_shuffle(uint64_t i)
|
|
{
|
|
uint64_t o = 0;
|
|
|
|
o |= extract64(i, 12, 4);
|
|
o |= extract64(i, 24, 4) << 4;
|
|
o |= extract64(i, 48, 4) << 8;
|
|
o |= extract64(i, 36, 4) << 12;
|
|
|
|
o |= extract64(i, 56, 4) << 16;
|
|
o |= extract64(i, 44, 4) << 20;
|
|
o |= extract64(i, 4, 4) << 24;
|
|
o |= extract64(i, 16, 4) << 28;
|
|
|
|
o |= i & MAKE_64BIT_MASK(32, 4);
|
|
o |= extract64(i, 52, 4) << 36;
|
|
o |= extract64(i, 28, 4) << 40;
|
|
o |= extract64(i, 8, 4) << 44;
|
|
|
|
o |= extract64(i, 20, 4) << 48;
|
|
o |= extract64(i, 0, 4) << 52;
|
|
o |= extract64(i, 40, 4) << 56;
|
|
o |= i & MAKE_64BIT_MASK(60, 4);
|
|
|
|
return o;
|
|
}
|
|
|
|
static uint64_t pac_sub(uint64_t i)
|
|
{
|
|
static const uint8_t sub[16] = {
|
|
0xb, 0x6, 0x8, 0xf, 0xc, 0x0, 0x9, 0xe,
|
|
0x3, 0x7, 0x4, 0x5, 0xd, 0x2, 0x1, 0xa,
|
|
};
|
|
uint64_t o = 0;
|
|
int b;
|
|
|
|
for (b = 0; b < 64; b += 4) {
|
|
o |= (uint64_t)sub[(i >> b) & 0xf] << b;
|
|
}
|
|
return o;
|
|
}
|
|
|
|
static uint64_t pac_inv_sub(uint64_t i)
|
|
{
|
|
static const uint8_t inv_sub[16] = {
|
|
0x5, 0xe, 0xd, 0x8, 0xa, 0xb, 0x1, 0x9,
|
|
0x2, 0x6, 0xf, 0x0, 0x4, 0xc, 0x7, 0x3,
|
|
};
|
|
uint64_t o = 0;
|
|
int b;
|
|
|
|
for (b = 0; b < 64; b += 4) {
|
|
o |= (uint64_t)inv_sub[(i >> b) & 0xf] << b;
|
|
}
|
|
return o;
|
|
}
|
|
|
|
static int rot_cell(int cell, int n)
|
|
{
|
|
/* 4-bit rotate left by n. */
|
|
cell |= cell << 4;
|
|
return extract32(cell, 4 - n, 4);
|
|
}
|
|
|
|
static uint64_t pac_mult(uint64_t i)
|
|
{
|
|
uint64_t o = 0;
|
|
int b;
|
|
|
|
for (b = 0; b < 4 * 4; b += 4) {
|
|
int i0, i4, i8, ic, t0, t1, t2, t3;
|
|
|
|
i0 = extract64(i, b, 4);
|
|
i4 = extract64(i, b + 4 * 4, 4);
|
|
i8 = extract64(i, b + 8 * 4, 4);
|
|
ic = extract64(i, b + 12 * 4, 4);
|
|
|
|
t0 = rot_cell(i8, 1) ^ rot_cell(i4, 2) ^ rot_cell(i0, 1);
|
|
t1 = rot_cell(ic, 1) ^ rot_cell(i4, 1) ^ rot_cell(i0, 2);
|
|
t2 = rot_cell(ic, 2) ^ rot_cell(i8, 1) ^ rot_cell(i0, 1);
|
|
t3 = rot_cell(ic, 1) ^ rot_cell(i8, 2) ^ rot_cell(i4, 1);
|
|
|
|
o |= (uint64_t)t3 << b;
|
|
o |= (uint64_t)t2 << (b + 4 * 4);
|
|
o |= (uint64_t)t1 << (b + 8 * 4);
|
|
o |= (uint64_t)t0 << (b + 12 * 4);
|
|
}
|
|
return o;
|
|
}
|
|
|
|
static uint64_t tweak_cell_rot(uint64_t cell)
|
|
{
|
|
return (cell >> 1) | (((cell ^ (cell >> 1)) & 1) << 3);
|
|
}
|
|
|
|
static uint64_t tweak_shuffle(uint64_t i)
|
|
{
|
|
uint64_t o = 0;
|
|
|
|
o |= extract64(i, 16, 4) << 0;
|
|
o |= extract64(i, 20, 4) << 4;
|
|
o |= tweak_cell_rot(extract64(i, 24, 4)) << 8;
|
|
o |= extract64(i, 28, 4) << 12;
|
|
|
|
o |= tweak_cell_rot(extract64(i, 44, 4)) << 16;
|
|
o |= extract64(i, 8, 4) << 20;
|
|
o |= extract64(i, 12, 4) << 24;
|
|
o |= tweak_cell_rot(extract64(i, 32, 4)) << 28;
|
|
|
|
o |= extract64(i, 48, 4) << 32;
|
|
o |= extract64(i, 52, 4) << 36;
|
|
o |= extract64(i, 56, 4) << 40;
|
|
o |= tweak_cell_rot(extract64(i, 60, 4)) << 44;
|
|
|
|
o |= tweak_cell_rot(extract64(i, 0, 4)) << 48;
|
|
o |= extract64(i, 4, 4) << 52;
|
|
o |= tweak_cell_rot(extract64(i, 40, 4)) << 56;
|
|
o |= tweak_cell_rot(extract64(i, 36, 4)) << 60;
|
|
|
|
return o;
|
|
}
|
|
|
|
static uint64_t tweak_cell_inv_rot(uint64_t cell)
|
|
{
|
|
return ((cell << 1) & 0xf) | ((cell & 1) ^ (cell >> 3));
|
|
}
|
|
|
|
static uint64_t tweak_inv_shuffle(uint64_t i)
|
|
{
|
|
uint64_t o = 0;
|
|
|
|
o |= tweak_cell_inv_rot(extract64(i, 48, 4));
|
|
o |= extract64(i, 52, 4) << 4;
|
|
o |= extract64(i, 20, 4) << 8;
|
|
o |= extract64(i, 24, 4) << 12;
|
|
|
|
o |= extract64(i, 0, 4) << 16;
|
|
o |= extract64(i, 4, 4) << 20;
|
|
o |= tweak_cell_inv_rot(extract64(i, 8, 4)) << 24;
|
|
o |= extract64(i, 12, 4) << 28;
|
|
|
|
o |= tweak_cell_inv_rot(extract64(i, 28, 4)) << 32;
|
|
o |= tweak_cell_inv_rot(extract64(i, 60, 4)) << 36;
|
|
o |= tweak_cell_inv_rot(extract64(i, 56, 4)) << 40;
|
|
o |= tweak_cell_inv_rot(extract64(i, 16, 4)) << 44;
|
|
|
|
o |= extract64(i, 32, 4) << 48;
|
|
o |= extract64(i, 36, 4) << 52;
|
|
o |= extract64(i, 40, 4) << 56;
|
|
o |= tweak_cell_inv_rot(extract64(i, 44, 4)) << 60;
|
|
|
|
return o;
|
|
}
|
|
|
|
static uint64_t pauth_computepac(uint64_t data, uint64_t modifier,
|
|
ARMPACKey key)
|
|
{
|
|
static const uint64_t RC[5] = {
|
|
0x0000000000000000ull,
|
|
0x13198A2E03707344ull,
|
|
0xA4093822299F31D0ull,
|
|
0x082EFA98EC4E6C89ull,
|
|
0x452821E638D01377ull,
|
|
};
|
|
const uint64_t alpha = 0xC0AC29B7C97C50DDull;
|
|
/*
|
|
* Note that in the ARM pseudocode, key0 contains bits <127:64>
|
|
* and key1 contains bits <63:0> of the 128-bit key.
|
|
*/
|
|
uint64_t key0 = key.hi, key1 = key.lo;
|
|
uint64_t workingval, runningmod, roundkey, modk0;
|
|
int i;
|
|
|
|
modk0 = (key0 << 63) | ((key0 >> 1) ^ (key0 >> 63));
|
|
runningmod = modifier;
|
|
workingval = data ^ key0;
|
|
|
|
for (i = 0; i <= 4; ++i) {
|
|
roundkey = key1 ^ runningmod;
|
|
workingval ^= roundkey;
|
|
workingval ^= RC[i];
|
|
if (i > 0) {
|
|
workingval = pac_cell_shuffle(workingval);
|
|
workingval = pac_mult(workingval);
|
|
}
|
|
workingval = pac_sub(workingval);
|
|
runningmod = tweak_shuffle(runningmod);
|
|
}
|
|
roundkey = modk0 ^ runningmod;
|
|
workingval ^= roundkey;
|
|
workingval = pac_cell_shuffle(workingval);
|
|
workingval = pac_mult(workingval);
|
|
workingval = pac_sub(workingval);
|
|
workingval = pac_cell_shuffle(workingval);
|
|
workingval = pac_mult(workingval);
|
|
workingval ^= key1;
|
|
workingval = pac_cell_inv_shuffle(workingval);
|
|
workingval = pac_inv_sub(workingval);
|
|
workingval = pac_mult(workingval);
|
|
workingval = pac_cell_inv_shuffle(workingval);
|
|
workingval ^= key0;
|
|
workingval ^= runningmod;
|
|
for (i = 0; i <= 4; ++i) {
|
|
workingval = pac_inv_sub(workingval);
|
|
if (i < 4) {
|
|
workingval = pac_mult(workingval);
|
|
workingval = pac_cell_inv_shuffle(workingval);
|
|
}
|
|
runningmod = tweak_inv_shuffle(runningmod);
|
|
roundkey = key1 ^ runningmod;
|
|
workingval ^= RC[4 - i];
|
|
workingval ^= roundkey;
|
|
workingval ^= alpha;
|
|
}
|
|
workingval ^= modk0;
|
|
|
|
return workingval;
|
|
}
|
|
|
|
static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,
|
|
ARMPACKey *key, bool data)
|
|
{
|
|
ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);
|
|
ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data);
|
|
uint64_t pac, ext_ptr, ext, test;
|
|
int bot_bit, top_bit;
|
|
|
|
/* If tagged pointers are in use, use ptr<55>, otherwise ptr<63>. */
|
|
if (param.tbi) {
|
|
ext = sextract64(ptr, 55, 1);
|
|
} else {
|
|
ext = sextract64(ptr, 63, 1);
|
|
}
|
|
|
|
/* Build a pointer with known good extension bits. */
|
|
top_bit = 64 - 8 * param.tbi;
|
|
bot_bit = 64 - param.tsz;
|
|
ext_ptr = deposit64(ptr, bot_bit, top_bit - bot_bit, ext);
|
|
|
|
pac = pauth_computepac(ext_ptr, modifier, *key);
|
|
|
|
/*
|
|
* Check if the ptr has good extension bits and corrupt the
|
|
* pointer authentication code if not.
|
|
*/
|
|
test = sextract64(ptr, bot_bit, top_bit - bot_bit);
|
|
if (test != 0 && test != -1) {
|
|
pac ^= MAKE_64BIT_MASK(top_bit - 1, 1);
|
|
}
|
|
|
|
/*
|
|
* Preserve the determination between upper and lower at bit 55,
|
|
* and insert pointer authentication code.
|
|
*/
|
|
if (param.tbi) {
|
|
ptr &= ~MAKE_64BIT_MASK(bot_bit, 55 - bot_bit + 1);
|
|
pac &= MAKE_64BIT_MASK(bot_bit, 54 - bot_bit + 1);
|
|
} else {
|
|
ptr &= MAKE_64BIT_MASK(0, bot_bit);
|
|
pac &= ~(MAKE_64BIT_MASK(55, 1) | MAKE_64BIT_MASK(0, bot_bit));
|
|
}
|
|
ext &= MAKE_64BIT_MASK(55, 1);
|
|
return pac | ext | ptr;
|
|
}
|
|
|
|
static uint64_t pauth_original_ptr(uint64_t ptr, ARMVAParameters param)
|
|
{
|
|
/* Note that bit 55 is used whether or not the regime has 2 ranges. */
|
|
uint64_t extfield = sextract64(ptr, 55, 1);
|
|
int bot_pac_bit = 64 - param.tsz;
|
|
int top_pac_bit = 64 - 8 * param.tbi;
|
|
|
|
return deposit64(ptr, bot_pac_bit, top_pac_bit - bot_pac_bit, extfield);
|
|
}
|
|
|
|
static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
|
|
ARMPACKey *key, bool data, int keynumber)
|
|
{
|
|
ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);
|
|
ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data);
|
|
int bot_bit, top_bit;
|
|
uint64_t pac, orig_ptr, test;
|
|
|
|
orig_ptr = pauth_original_ptr(ptr, param);
|
|
pac = pauth_computepac(orig_ptr, modifier, *key);
|
|
bot_bit = 64 - param.tsz;
|
|
top_bit = 64 - 8 * param.tbi;
|
|
|
|
test = (pac ^ ptr) & ~MAKE_64BIT_MASK(55, 1);
|
|
if (unlikely(extract64(test, bot_bit, top_bit - bot_bit))) {
|
|
int error_code = (keynumber << 1) | (keynumber ^ 1);
|
|
if (param.tbi) {
|
|
return deposit64(orig_ptr, 53, 2, error_code);
|
|
} else {
|
|
return deposit64(orig_ptr, 61, 2, error_code);
|
|
}
|
|
}
|
|
return orig_ptr;
|
|
}
|
|
|
|
static uint64_t pauth_strip(CPUARMState *env, uint64_t ptr, bool data)
|
|
{
|
|
ARMMMUIdx mmu_idx = arm_stage1_mmu_idx(env);
|
|
ARMVAParameters param = aa64_va_parameters(env, ptr, mmu_idx, data);
|
|
|
|
return pauth_original_ptr(ptr, param);
|
|
}
|
|
|
|
static void QEMU_NORETURN pauth_trap(CPUARMState *env, int target_el,
|
|
uintptr_t ra)
|
|
{
|
|
raise_exception_ra(env, EXCP_UDEF, syn_pactrap(), target_el, ra);
|
|
}
|
|
|
|
static void pauth_check_trap(CPUARMState *env, int el, uintptr_t ra)
|
|
{
|
|
if (el < 2 && arm_feature(env, ARM_FEATURE_EL2)) {
|
|
uint64_t hcr = arm_hcr_el2_eff(env);
|
|
bool trap = !(hcr & HCR_API);
|
|
if (el == 0) {
|
|
/* Trap only applies to EL1&0 regime. */
|
|
trap &= (hcr & (HCR_E2H | HCR_TGE)) != (HCR_E2H | HCR_TGE);
|
|
}
|
|
/* FIXME: ARMv8.3-NV: HCR_NV trap takes precedence for ERETA[AB]. */
|
|
if (trap) {
|
|
pauth_trap(env, 2, ra);
|
|
}
|
|
}
|
|
if (el < 3 && arm_feature(env, ARM_FEATURE_EL3)) {
|
|
if (!(env->cp15.scr_el3 & SCR_API)) {
|
|
pauth_trap(env, 3, ra);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool pauth_key_enabled(CPUARMState *env, int el, uint32_t bit)
|
|
{
|
|
return (arm_sctlr(env, el) & bit) != 0;
|
|
}
|
|
|
|
uint64_t HELPER(pacia)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnIA)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_addpac(env, x, y, &env->keys.apia, false);
|
|
}
|
|
|
|
uint64_t HELPER(pacib)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnIB)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_addpac(env, x, y, &env->keys.apib, false);
|
|
}
|
|
|
|
uint64_t HELPER(pacda)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnDA)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_addpac(env, x, y, &env->keys.apda, true);
|
|
}
|
|
|
|
uint64_t HELPER(pacdb)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnDB)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_addpac(env, x, y, &env->keys.apdb, true);
|
|
}
|
|
|
|
uint64_t HELPER(pacga)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
uint64_t pac;
|
|
|
|
pauth_check_trap(env, arm_current_el(env), GETPC());
|
|
pac = pauth_computepac(x, y, env->keys.apga);
|
|
|
|
return pac & 0xffffffff00000000ull;
|
|
}
|
|
|
|
uint64_t HELPER(autia)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnIA)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_auth(env, x, y, &env->keys.apia, false, 0);
|
|
}
|
|
|
|
uint64_t HELPER(autib)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnIB)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_auth(env, x, y, &env->keys.apib, false, 1);
|
|
}
|
|
|
|
uint64_t HELPER(autda)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnDA)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_auth(env, x, y, &env->keys.apda, true, 0);
|
|
}
|
|
|
|
uint64_t HELPER(autdb)(CPUARMState *env, uint64_t x, uint64_t y)
|
|
{
|
|
int el = arm_current_el(env);
|
|
if (!pauth_key_enabled(env, el, SCTLR_EnDB)) {
|
|
return x;
|
|
}
|
|
pauth_check_trap(env, el, GETPC());
|
|
return pauth_auth(env, x, y, &env->keys.apdb, true, 1);
|
|
}
|
|
|
|
uint64_t HELPER(xpaci)(CPUARMState *env, uint64_t a)
|
|
{
|
|
return pauth_strip(env, a, false);
|
|
}
|
|
|
|
uint64_t HELPER(xpacd)(CPUARMState *env, uint64_t a)
|
|
{
|
|
return pauth_strip(env, a, true);
|
|
}
|