In BE32 mode, sub-word size watchpoints can fail to trigger because the address of the access is adjusted in the opcode helpers before being compared with the watchpoint registers. This patch reverses the address adjustment before performing the comparison with the help of a new CPUClass hook. This version of the patch augments and tidies up comments a little. Signed-off-by: Julian Brown <julian@codesourcery.com> Message-id: caaf64ffc72f6ae183015337b7afdbd4b8989cb6.1484929304.git.julian@codesourcery.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
502 lines
16 KiB
C
502 lines
16 KiB
C
/*
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* QEMU ARM CPU -- internal functions and types
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*
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* Copyright (c) 2014 Linaro Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see
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* <http://www.gnu.org/licenses/gpl-2.0.html>
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*
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* This header defines functions, types, etc which need to be shared
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* between different source files within target/arm/ but which are
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* private to it and not required by the rest of QEMU.
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*/
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#ifndef TARGET_ARM_INTERNALS_H
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#define TARGET_ARM_INTERNALS_H
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#include "hw/registerfields.h"
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/* register banks for CPU modes */
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#define BANK_USRSYS 0
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#define BANK_SVC 1
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#define BANK_ABT 2
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#define BANK_UND 3
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#define BANK_IRQ 4
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#define BANK_FIQ 5
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#define BANK_HYP 6
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#define BANK_MON 7
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static inline bool excp_is_internal(int excp)
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{
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/* Return true if this exception number represents a QEMU-internal
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* exception that will not be passed to the guest.
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*/
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return excp == EXCP_INTERRUPT
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|| excp == EXCP_HLT
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|| excp == EXCP_DEBUG
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|| excp == EXCP_HALTED
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|| excp == EXCP_EXCEPTION_EXIT
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|| excp == EXCP_KERNEL_TRAP
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|| excp == EXCP_SEMIHOST;
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}
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/* Exception names for debug logging; note that not all of these
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* precisely correspond to architectural exceptions.
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*/
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static const char * const excnames[] = {
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[EXCP_UDEF] = "Undefined Instruction",
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[EXCP_SWI] = "SVC",
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[EXCP_PREFETCH_ABORT] = "Prefetch Abort",
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[EXCP_DATA_ABORT] = "Data Abort",
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[EXCP_IRQ] = "IRQ",
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[EXCP_FIQ] = "FIQ",
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[EXCP_BKPT] = "Breakpoint",
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[EXCP_EXCEPTION_EXIT] = "QEMU v7M exception exit",
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[EXCP_KERNEL_TRAP] = "QEMU intercept of kernel commpage",
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[EXCP_HVC] = "Hypervisor Call",
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[EXCP_HYP_TRAP] = "Hypervisor Trap",
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[EXCP_SMC] = "Secure Monitor Call",
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[EXCP_VIRQ] = "Virtual IRQ",
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[EXCP_VFIQ] = "Virtual FIQ",
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[EXCP_SEMIHOST] = "Semihosting call",
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};
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/* Scale factor for generic timers, ie number of ns per tick.
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* This gives a 62.5MHz timer.
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*/
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#define GTIMER_SCALE 16
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/* Bit definitions for the v7M CONTROL register */
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FIELD(V7M_CONTROL, NPRIV, 0, 1)
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FIELD(V7M_CONTROL, SPSEL, 1, 1)
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FIELD(V7M_CONTROL, FPCA, 2, 1)
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/*
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* For AArch64, map a given EL to an index in the banked_spsr array.
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* Note that this mapping and the AArch32 mapping defined in bank_number()
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* must agree such that the AArch64<->AArch32 SPSRs have the architecturally
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* mandated mapping between each other.
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*/
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static inline unsigned int aarch64_banked_spsr_index(unsigned int el)
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{
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static const unsigned int map[4] = {
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[1] = BANK_SVC, /* EL1. */
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[2] = BANK_HYP, /* EL2. */
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[3] = BANK_MON, /* EL3. */
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};
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assert(el >= 1 && el <= 3);
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return map[el];
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}
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/* Map CPU modes onto saved register banks. */
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static inline int bank_number(int mode)
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{
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switch (mode) {
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case ARM_CPU_MODE_USR:
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case ARM_CPU_MODE_SYS:
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return BANK_USRSYS;
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case ARM_CPU_MODE_SVC:
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return BANK_SVC;
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case ARM_CPU_MODE_ABT:
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return BANK_ABT;
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case ARM_CPU_MODE_UND:
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return BANK_UND;
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case ARM_CPU_MODE_IRQ:
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return BANK_IRQ;
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case ARM_CPU_MODE_FIQ:
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return BANK_FIQ;
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case ARM_CPU_MODE_HYP:
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return BANK_HYP;
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case ARM_CPU_MODE_MON:
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return BANK_MON;
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}
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g_assert_not_reached();
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}
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void switch_mode(CPUARMState *, int);
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void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu);
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void arm_translate_init(void);
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enum arm_fprounding {
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FPROUNDING_TIEEVEN,
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FPROUNDING_POSINF,
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FPROUNDING_NEGINF,
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FPROUNDING_ZERO,
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FPROUNDING_TIEAWAY,
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FPROUNDING_ODD
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};
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int arm_rmode_to_sf(int rmode);
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static inline void aarch64_save_sp(CPUARMState *env, int el)
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{
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if (env->pstate & PSTATE_SP) {
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env->sp_el[el] = env->xregs[31];
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} else {
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env->sp_el[0] = env->xregs[31];
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}
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}
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static inline void aarch64_restore_sp(CPUARMState *env, int el)
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{
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if (env->pstate & PSTATE_SP) {
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env->xregs[31] = env->sp_el[el];
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} else {
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env->xregs[31] = env->sp_el[0];
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}
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}
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static inline void update_spsel(CPUARMState *env, uint32_t imm)
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{
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unsigned int cur_el = arm_current_el(env);
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/* Update PSTATE SPSel bit; this requires us to update the
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* working stack pointer in xregs[31].
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*/
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if (!((imm ^ env->pstate) & PSTATE_SP)) {
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return;
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}
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aarch64_save_sp(env, cur_el);
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env->pstate = deposit32(env->pstate, 0, 1, imm);
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/* We rely on illegal updates to SPsel from EL0 to get trapped
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* at translation time.
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*/
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assert(cur_el >= 1 && cur_el <= 3);
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aarch64_restore_sp(env, cur_el);
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}
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/*
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* arm_pamax
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* @cpu: ARMCPU
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*
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* Returns the implementation defined bit-width of physical addresses.
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* The ARMv8 reference manuals refer to this as PAMax().
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*/
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static inline unsigned int arm_pamax(ARMCPU *cpu)
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{
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static const unsigned int pamax_map[] = {
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[0] = 32,
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[1] = 36,
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[2] = 40,
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[3] = 42,
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[4] = 44,
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[5] = 48,
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};
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unsigned int parange = extract32(cpu->id_aa64mmfr0, 0, 4);
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/* id_aa64mmfr0 is a read-only register so values outside of the
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* supported mappings can be considered an implementation error. */
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assert(parange < ARRAY_SIZE(pamax_map));
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return pamax_map[parange];
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}
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/* Return true if extended addresses are enabled.
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* This is always the case if our translation regime is 64 bit,
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* but depends on TTBCR.EAE for 32 bit.
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*/
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static inline bool extended_addresses_enabled(CPUARMState *env)
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{
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TCR *tcr = &env->cp15.tcr_el[arm_is_secure(env) ? 3 : 1];
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return arm_el_is_aa64(env, 1) ||
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(arm_feature(env, ARM_FEATURE_LPAE) && (tcr->raw_tcr & TTBCR_EAE));
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}
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/* Valid Syndrome Register EC field values */
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enum arm_exception_class {
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EC_UNCATEGORIZED = 0x00,
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EC_WFX_TRAP = 0x01,
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EC_CP15RTTRAP = 0x03,
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EC_CP15RRTTRAP = 0x04,
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EC_CP14RTTRAP = 0x05,
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EC_CP14DTTRAP = 0x06,
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EC_ADVSIMDFPACCESSTRAP = 0x07,
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EC_FPIDTRAP = 0x08,
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EC_CP14RRTTRAP = 0x0c,
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EC_ILLEGALSTATE = 0x0e,
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EC_AA32_SVC = 0x11,
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EC_AA32_HVC = 0x12,
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EC_AA32_SMC = 0x13,
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EC_AA64_SVC = 0x15,
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EC_AA64_HVC = 0x16,
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EC_AA64_SMC = 0x17,
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EC_SYSTEMREGISTERTRAP = 0x18,
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EC_INSNABORT = 0x20,
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EC_INSNABORT_SAME_EL = 0x21,
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EC_PCALIGNMENT = 0x22,
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EC_DATAABORT = 0x24,
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EC_DATAABORT_SAME_EL = 0x25,
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EC_SPALIGNMENT = 0x26,
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EC_AA32_FPTRAP = 0x28,
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EC_AA64_FPTRAP = 0x2c,
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EC_SERROR = 0x2f,
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EC_BREAKPOINT = 0x30,
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EC_BREAKPOINT_SAME_EL = 0x31,
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EC_SOFTWARESTEP = 0x32,
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EC_SOFTWARESTEP_SAME_EL = 0x33,
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EC_WATCHPOINT = 0x34,
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EC_WATCHPOINT_SAME_EL = 0x35,
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EC_AA32_BKPT = 0x38,
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EC_VECTORCATCH = 0x3a,
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EC_AA64_BKPT = 0x3c,
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};
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#define ARM_EL_EC_SHIFT 26
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#define ARM_EL_IL_SHIFT 25
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#define ARM_EL_ISV_SHIFT 24
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#define ARM_EL_IL (1 << ARM_EL_IL_SHIFT)
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#define ARM_EL_ISV (1 << ARM_EL_ISV_SHIFT)
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/* Utility functions for constructing various kinds of syndrome value.
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* Note that in general we follow the AArch64 syndrome values; in a
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* few cases the value in HSR for exceptions taken to AArch32 Hyp
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* mode differs slightly, so if we ever implemented Hyp mode then the
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* syndrome value would need some massaging on exception entry.
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* (One example of this is that AArch64 defaults to IL bit set for
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* exceptions which don't specifically indicate information about the
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* trapping instruction, whereas AArch32 defaults to IL bit clear.)
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*/
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static inline uint32_t syn_uncategorized(void)
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{
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return (EC_UNCATEGORIZED << ARM_EL_EC_SHIFT) | ARM_EL_IL;
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}
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static inline uint32_t syn_aa64_svc(uint32_t imm16)
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{
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return (EC_AA64_SVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
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}
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static inline uint32_t syn_aa64_hvc(uint32_t imm16)
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{
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return (EC_AA64_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
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}
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static inline uint32_t syn_aa64_smc(uint32_t imm16)
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{
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return (EC_AA64_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
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}
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static inline uint32_t syn_aa32_svc(uint32_t imm16, bool is_16bit)
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{
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return (EC_AA32_SVC << ARM_EL_EC_SHIFT) | (imm16 & 0xffff)
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| (is_16bit ? 0 : ARM_EL_IL);
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}
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static inline uint32_t syn_aa32_hvc(uint32_t imm16)
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{
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return (EC_AA32_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
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}
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static inline uint32_t syn_aa32_smc(void)
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{
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return (EC_AA32_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL;
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}
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static inline uint32_t syn_aa64_bkpt(uint32_t imm16)
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{
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return (EC_AA64_BKPT << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
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}
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static inline uint32_t syn_aa32_bkpt(uint32_t imm16, bool is_16bit)
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{
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return (EC_AA32_BKPT << ARM_EL_EC_SHIFT) | (imm16 & 0xffff)
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| (is_16bit ? 0 : ARM_EL_IL);
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}
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static inline uint32_t syn_aa64_sysregtrap(int op0, int op1, int op2,
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int crn, int crm, int rt,
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int isread)
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{
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return (EC_SYSTEMREGISTERTRAP << ARM_EL_EC_SHIFT) | ARM_EL_IL
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| (op0 << 20) | (op2 << 17) | (op1 << 14) | (crn << 10) | (rt << 5)
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| (crm << 1) | isread;
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}
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static inline uint32_t syn_cp14_rt_trap(int cv, int cond, int opc1, int opc2,
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int crn, int crm, int rt, int isread,
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bool is_16bit)
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{
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return (EC_CP14RTTRAP << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14)
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| (crn << 10) | (rt << 5) | (crm << 1) | isread;
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}
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static inline uint32_t syn_cp15_rt_trap(int cv, int cond, int opc1, int opc2,
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int crn, int crm, int rt, int isread,
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bool is_16bit)
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{
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return (EC_CP15RTTRAP << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14)
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| (crn << 10) | (rt << 5) | (crm << 1) | isread;
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}
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static inline uint32_t syn_cp14_rrt_trap(int cv, int cond, int opc1, int crm,
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int rt, int rt2, int isread,
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bool is_16bit)
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{
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return (EC_CP14RRTTRAP << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| (cv << 24) | (cond << 20) | (opc1 << 16)
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| (rt2 << 10) | (rt << 5) | (crm << 1) | isread;
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}
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static inline uint32_t syn_cp15_rrt_trap(int cv, int cond, int opc1, int crm,
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int rt, int rt2, int isread,
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bool is_16bit)
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{
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return (EC_CP15RRTTRAP << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| (cv << 24) | (cond << 20) | (opc1 << 16)
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| (rt2 << 10) | (rt << 5) | (crm << 1) | isread;
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}
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static inline uint32_t syn_fp_access_trap(int cv, int cond, bool is_16bit)
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{
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return (EC_ADVSIMDFPACCESSTRAP << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| (cv << 24) | (cond << 20);
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}
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static inline uint32_t syn_insn_abort(int same_el, int ea, int s1ptw, int fsc)
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{
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return (EC_INSNABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| ARM_EL_IL | (ea << 9) | (s1ptw << 7) | fsc;
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}
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static inline uint32_t syn_data_abort_no_iss(int same_el,
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int ea, int cm, int s1ptw,
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int wnr, int fsc)
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{
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return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| ARM_EL_IL
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| (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc;
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}
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static inline uint32_t syn_data_abort_with_iss(int same_el,
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int sas, int sse, int srt,
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int sf, int ar,
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int ea, int cm, int s1ptw,
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int wnr, int fsc,
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bool is_16bit)
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{
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return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| (is_16bit ? 0 : ARM_EL_IL)
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| ARM_EL_ISV | (sas << 22) | (sse << 21) | (srt << 16)
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| (sf << 15) | (ar << 14)
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| (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc;
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}
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static inline uint32_t syn_swstep(int same_el, int isv, int ex)
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{
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return (EC_SOFTWARESTEP << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| ARM_EL_IL | (isv << 24) | (ex << 6) | 0x22;
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}
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static inline uint32_t syn_watchpoint(int same_el, int cm, int wnr)
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{
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return (EC_WATCHPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| ARM_EL_IL | (cm << 8) | (wnr << 6) | 0x22;
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}
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static inline uint32_t syn_breakpoint(int same_el)
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{
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return (EC_BREAKPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
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| ARM_EL_IL | 0x22;
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}
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static inline uint32_t syn_wfx(int cv, int cond, int ti)
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{
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return (EC_WFX_TRAP << ARM_EL_EC_SHIFT) |
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(cv << 24) | (cond << 20) | ti;
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}
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/* Update a QEMU watchpoint based on the information the guest has set in the
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* DBGWCR<n>_EL1 and DBGWVR<n>_EL1 registers.
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*/
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void hw_watchpoint_update(ARMCPU *cpu, int n);
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/* Update the QEMU watchpoints for every guest watchpoint. This does a
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* complete delete-and-reinstate of the QEMU watchpoint list and so is
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* suitable for use after migration or on reset.
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*/
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void hw_watchpoint_update_all(ARMCPU *cpu);
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/* Update a QEMU breakpoint based on the information the guest has set in the
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* DBGBCR<n>_EL1 and DBGBVR<n>_EL1 registers.
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*/
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void hw_breakpoint_update(ARMCPU *cpu, int n);
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/* Update the QEMU breakpoints for every guest breakpoint. This does a
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* complete delete-and-reinstate of the QEMU breakpoint list and so is
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* suitable for use after migration or on reset.
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*/
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void hw_breakpoint_update_all(ARMCPU *cpu);
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|
|
|
/* Callback function for checking if a watchpoint should trigger. */
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bool arm_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp);
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|
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/* Adjust addresses (in BE32 mode) before testing against watchpoint
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* addresses.
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|
*/
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|
vaddr arm_adjust_watchpoint_address(CPUState *cs, vaddr addr, int len);
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|
|
|
/* Callback function for when a watchpoint or breakpoint triggers. */
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|
void arm_debug_excp_handler(CPUState *cs);
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|
|
|
#ifdef CONFIG_USER_ONLY
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|
static inline bool arm_is_psci_call(ARMCPU *cpu, int excp_type)
|
|
{
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|
return false;
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|
}
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|
#else
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|
/* Return true if the r0/x0 value indicates that this SMC/HVC is a PSCI call. */
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|
bool arm_is_psci_call(ARMCPU *cpu, int excp_type);
|
|
/* Actually handle a PSCI call */
|
|
void arm_handle_psci_call(ARMCPU *cpu);
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|
#endif
|
|
|
|
/**
|
|
* ARMMMUFaultInfo: Information describing an ARM MMU Fault
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|
* @s2addr: Address that caused a fault at stage 2
|
|
* @stage2: True if we faulted at stage 2
|
|
* @s1ptw: True if we faulted at stage 2 while doing a stage 1 page-table walk
|
|
*/
|
|
typedef struct ARMMMUFaultInfo ARMMMUFaultInfo;
|
|
struct ARMMMUFaultInfo {
|
|
target_ulong s2addr;
|
|
bool stage2;
|
|
bool s1ptw;
|
|
};
|
|
|
|
/* Do a page table walk and add page to TLB if possible */
|
|
bool arm_tlb_fill(CPUState *cpu, vaddr address, int rw, int mmu_idx,
|
|
uint32_t *fsr, ARMMMUFaultInfo *fi);
|
|
|
|
/* Return true if the stage 1 translation regime is using LPAE format page
|
|
* tables */
|
|
bool arm_s1_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx);
|
|
|
|
/* Raise a data fault alignment exception for the specified virtual address */
|
|
void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
|
|
MMUAccessType access_type,
|
|
int mmu_idx, uintptr_t retaddr);
|
|
|
|
/* Call the EL change hook if one has been registered */
|
|
static inline void arm_call_el_change_hook(ARMCPU *cpu)
|
|
{
|
|
if (cpu->el_change_hook) {
|
|
cpu->el_change_hook(cpu, cpu->el_change_hook_opaque);
|
|
}
|
|
}
|
|
|
|
#endif
|