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qemu-e2k/target-xtensa/cpu.h
Max Filippov 1b3e71f8ee target-xtensa: add missing window check for entry 
Entry opcode needs to check if moving to new register frame would cause
register window overflow. Entry used in function prologue never
overflows because preceding windowed call* opcode writes return address
to the target register window frame, causing overflow exceptions at the
point of call. But when a sequence of entry opcodes is used for register
window spilling there may not be a call or other opcode that would cause
window check between entries and they would not raise overflow exception
themselves resulting in data corruption.

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-11-10 17:59:13 +03:00

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/*
* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Open Source and Linux Lab nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CPU_XTENSA_H
#define CPU_XTENSA_H
#define ALIGNED_ONLY
#define TARGET_LONG_BITS 32
#define ELF_MACHINE EM_XTENSA
#define CPUArchState struct CPUXtensaState
#include "config.h"
#include "qemu-common.h"
#include "exec/cpu-defs.h"
#include "fpu/softfloat.h"
#define TARGET_HAS_ICE 1
#define NB_MMU_MODES 4
#define TARGET_PHYS_ADDR_SPACE_BITS 32
#define TARGET_VIRT_ADDR_SPACE_BITS 32
#define TARGET_PAGE_BITS 12
enum {
/* Additional instructions */
XTENSA_OPTION_CODE_DENSITY,
XTENSA_OPTION_LOOP,
XTENSA_OPTION_EXTENDED_L32R,
XTENSA_OPTION_16_BIT_IMUL,
XTENSA_OPTION_32_BIT_IMUL,
XTENSA_OPTION_32_BIT_IMUL_HIGH,
XTENSA_OPTION_32_BIT_IDIV,
XTENSA_OPTION_MAC16,
XTENSA_OPTION_MISC_OP_NSA,
XTENSA_OPTION_MISC_OP_MINMAX,
XTENSA_OPTION_MISC_OP_SEXT,
XTENSA_OPTION_MISC_OP_CLAMPS,
XTENSA_OPTION_COPROCESSOR,
XTENSA_OPTION_BOOLEAN,
XTENSA_OPTION_FP_COPROCESSOR,
XTENSA_OPTION_MP_SYNCHRO,
XTENSA_OPTION_CONDITIONAL_STORE,
XTENSA_OPTION_ATOMCTL,
/* Interrupts and exceptions */
XTENSA_OPTION_EXCEPTION,
XTENSA_OPTION_RELOCATABLE_VECTOR,
XTENSA_OPTION_UNALIGNED_EXCEPTION,
XTENSA_OPTION_INTERRUPT,
XTENSA_OPTION_HIGH_PRIORITY_INTERRUPT,
XTENSA_OPTION_TIMER_INTERRUPT,
/* Local memory */
XTENSA_OPTION_ICACHE,
XTENSA_OPTION_ICACHE_TEST,
XTENSA_OPTION_ICACHE_INDEX_LOCK,
XTENSA_OPTION_DCACHE,
XTENSA_OPTION_DCACHE_TEST,
XTENSA_OPTION_DCACHE_INDEX_LOCK,
XTENSA_OPTION_IRAM,
XTENSA_OPTION_IROM,
XTENSA_OPTION_DRAM,
XTENSA_OPTION_DROM,
XTENSA_OPTION_XLMI,
XTENSA_OPTION_HW_ALIGNMENT,
XTENSA_OPTION_MEMORY_ECC_PARITY,
/* Memory protection and translation */
XTENSA_OPTION_REGION_PROTECTION,
XTENSA_OPTION_REGION_TRANSLATION,
XTENSA_OPTION_MMU,
XTENSA_OPTION_CACHEATTR,
/* Other */
XTENSA_OPTION_WINDOWED_REGISTER,
XTENSA_OPTION_PROCESSOR_INTERFACE,
XTENSA_OPTION_MISC_SR,
XTENSA_OPTION_THREAD_POINTER,
XTENSA_OPTION_PROCESSOR_ID,
XTENSA_OPTION_DEBUG,
XTENSA_OPTION_TRACE_PORT,
};
enum {
THREADPTR = 231,
FCR = 232,
FSR = 233,
};
enum {
LBEG = 0,
LEND = 1,
LCOUNT = 2,
SAR = 3,
BR = 4,
LITBASE = 5,
SCOMPARE1 = 12,
ACCLO = 16,
ACCHI = 17,
MR = 32,
WINDOW_BASE = 72,
WINDOW_START = 73,
PTEVADDR = 83,
RASID = 90,
ITLBCFG = 91,
DTLBCFG = 92,
IBREAKENABLE = 96,
CACHEATTR = 98,
ATOMCTL = 99,
IBREAKA = 128,
DBREAKA = 144,
DBREAKC = 160,
CONFIGID0 = 176,
EPC1 = 177,
DEPC = 192,
EPS2 = 194,
CONFIGID1 = 208,
EXCSAVE1 = 209,
CPENABLE = 224,
INTSET = 226,
INTCLEAR = 227,
INTENABLE = 228,
PS = 230,
VECBASE = 231,
EXCCAUSE = 232,
DEBUGCAUSE = 233,
CCOUNT = 234,
PRID = 235,
ICOUNT = 236,
ICOUNTLEVEL = 237,
EXCVADDR = 238,
CCOMPARE = 240,
MISC = 244,
};
#define PS_INTLEVEL 0xf
#define PS_INTLEVEL_SHIFT 0
#define PS_EXCM 0x10
#define PS_UM 0x20
#define PS_RING 0xc0
#define PS_RING_SHIFT 6
#define PS_OWB 0xf00
#define PS_OWB_SHIFT 8
#define PS_CALLINC 0x30000
#define PS_CALLINC_SHIFT 16
#define PS_CALLINC_LEN 2
#define PS_WOE 0x40000
#define DEBUGCAUSE_IC 0x1
#define DEBUGCAUSE_IB 0x2
#define DEBUGCAUSE_DB 0x4
#define DEBUGCAUSE_BI 0x8
#define DEBUGCAUSE_BN 0x10
#define DEBUGCAUSE_DI 0x20
#define DEBUGCAUSE_DBNUM 0xf00
#define DEBUGCAUSE_DBNUM_SHIFT 8
#define DBREAKC_SB 0x80000000
#define DBREAKC_LB 0x40000000
#define DBREAKC_SB_LB (DBREAKC_SB | DBREAKC_LB)
#define DBREAKC_MASK 0x3f
#define MAX_NAREG 64
#define MAX_NINTERRUPT 32
#define MAX_NLEVEL 6
#define MAX_NNMI 1
#define MAX_NCCOMPARE 3
#define MAX_TLB_WAY_SIZE 8
#define MAX_NDBREAK 2
#define REGION_PAGE_MASK 0xe0000000
#define PAGE_CACHE_MASK 0x700
#define PAGE_CACHE_SHIFT 8
#define PAGE_CACHE_INVALID 0x000
#define PAGE_CACHE_BYPASS 0x100
#define PAGE_CACHE_WT 0x200
#define PAGE_CACHE_WB 0x400
#define PAGE_CACHE_ISOLATE 0x600
enum {
/* Static vectors */
EXC_RESET,
EXC_MEMORY_ERROR,
/* Dynamic vectors */
EXC_WINDOW_OVERFLOW4,
EXC_WINDOW_UNDERFLOW4,
EXC_WINDOW_OVERFLOW8,
EXC_WINDOW_UNDERFLOW8,
EXC_WINDOW_OVERFLOW12,
EXC_WINDOW_UNDERFLOW12,
EXC_IRQ,
EXC_KERNEL,
EXC_USER,
EXC_DOUBLE,
EXC_DEBUG,
EXC_MAX
};
enum {
ILLEGAL_INSTRUCTION_CAUSE = 0,
SYSCALL_CAUSE,
INSTRUCTION_FETCH_ERROR_CAUSE,
LOAD_STORE_ERROR_CAUSE,
LEVEL1_INTERRUPT_CAUSE,
ALLOCA_CAUSE,
INTEGER_DIVIDE_BY_ZERO_CAUSE,
PRIVILEGED_CAUSE = 8,
LOAD_STORE_ALIGNMENT_CAUSE,
INSTR_PIF_DATA_ERROR_CAUSE = 12,
LOAD_STORE_PIF_DATA_ERROR_CAUSE,
INSTR_PIF_ADDR_ERROR_CAUSE,
LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
INST_TLB_MISS_CAUSE,
INST_TLB_MULTI_HIT_CAUSE,
INST_FETCH_PRIVILEGE_CAUSE,
INST_FETCH_PROHIBITED_CAUSE = 20,
LOAD_STORE_TLB_MISS_CAUSE = 24,
LOAD_STORE_TLB_MULTI_HIT_CAUSE,
LOAD_STORE_PRIVILEGE_CAUSE,
LOAD_PROHIBITED_CAUSE = 28,
STORE_PROHIBITED_CAUSE,
COPROCESSOR0_DISABLED = 32,
};
typedef enum {
INTTYPE_LEVEL,
INTTYPE_EDGE,
INTTYPE_NMI,
INTTYPE_SOFTWARE,
INTTYPE_TIMER,
INTTYPE_DEBUG,
INTTYPE_WRITE_ERR,
INTTYPE_PROFILING,
INTTYPE_MAX
} interrupt_type;
typedef struct xtensa_tlb_entry {
uint32_t vaddr;
uint32_t paddr;
uint8_t asid;
uint8_t attr;
bool variable;
} xtensa_tlb_entry;
typedef struct xtensa_tlb {
unsigned nways;
const unsigned way_size[10];
bool varway56;
unsigned nrefillentries;
} xtensa_tlb;
typedef struct XtensaGdbReg {
int targno;
int type;
int group;
} XtensaGdbReg;
typedef struct XtensaGdbRegmap {
int num_regs;
int num_core_regs;
/* PC + a + ar + sr + ur */
XtensaGdbReg reg[1 + 16 + 64 + 256 + 256];
} XtensaGdbRegmap;
typedef struct XtensaConfig {
const char *name;
uint64_t options;
XtensaGdbRegmap gdb_regmap;
unsigned nareg;
int excm_level;
int ndepc;
uint32_t vecbase;
uint32_t exception_vector[EXC_MAX];
unsigned ninterrupt;
unsigned nlevel;
uint32_t interrupt_vector[MAX_NLEVEL + MAX_NNMI + 1];
uint32_t level_mask[MAX_NLEVEL + MAX_NNMI + 1];
uint32_t inttype_mask[INTTYPE_MAX];
struct {
uint32_t level;
interrupt_type inttype;
} interrupt[MAX_NINTERRUPT];
unsigned nccompare;
uint32_t timerint[MAX_NCCOMPARE];
unsigned nextint;
unsigned extint[MAX_NINTERRUPT];
unsigned debug_level;
unsigned nibreak;
unsigned ndbreak;
uint32_t configid[2];
uint32_t clock_freq_khz;
xtensa_tlb itlb;
xtensa_tlb dtlb;
} XtensaConfig;
typedef struct XtensaConfigList {
const XtensaConfig *config;
struct XtensaConfigList *next;
} XtensaConfigList;
typedef struct CPUXtensaState {
const XtensaConfig *config;
uint32_t regs[16];
uint32_t pc;
uint32_t sregs[256];
uint32_t uregs[256];
uint32_t phys_regs[MAX_NAREG];
float32 fregs[16];
float_status fp_status;
xtensa_tlb_entry itlb[7][MAX_TLB_WAY_SIZE];
xtensa_tlb_entry dtlb[10][MAX_TLB_WAY_SIZE];
unsigned autorefill_idx;
int pending_irq_level; /* level of last raised IRQ */
void **irq_inputs;
QEMUTimer *ccompare_timer;
uint32_t wake_ccount;
int64_t halt_clock;
int exception_taken;
/* Watchpoints for DBREAK registers */
struct CPUWatchpoint *cpu_watchpoint[MAX_NDBREAK];
CPU_COMMON
} CPUXtensaState;
#include "cpu-qom.h"
#define cpu_exec cpu_xtensa_exec
#define cpu_gen_code cpu_xtensa_gen_code
#define cpu_signal_handler cpu_xtensa_signal_handler
#define cpu_list xtensa_cpu_list
#ifdef TARGET_WORDS_BIGENDIAN
#define XTENSA_DEFAULT_CPU_MODEL "fsf"
#else
#define XTENSA_DEFAULT_CPU_MODEL "dc232b"
#endif
XtensaCPU *cpu_xtensa_init(const char *cpu_model);
static inline CPUXtensaState *cpu_init(const char *cpu_model)
{
XtensaCPU *cpu = cpu_xtensa_init(cpu_model);
if (cpu == NULL) {
return NULL;
}
return &cpu->env;
}
void xtensa_translate_init(void);
void xtensa_breakpoint_handler(CPUState *cs);
int cpu_xtensa_exec(CPUXtensaState *s);
void xtensa_register_core(XtensaConfigList *node);
void check_interrupts(CPUXtensaState *s);
void xtensa_irq_init(CPUXtensaState *env);
void *xtensa_get_extint(CPUXtensaState *env, unsigned extint);
void xtensa_advance_ccount(CPUXtensaState *env, uint32_t d);
void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active);
void xtensa_rearm_ccompare_timer(CPUXtensaState *env);
int cpu_xtensa_signal_handler(int host_signum, void *pinfo, void *puc);
void xtensa_cpu_list(FILE *f, fprintf_function cpu_fprintf);
void xtensa_sync_window_from_phys(CPUXtensaState *env);
void xtensa_sync_phys_from_window(CPUXtensaState *env);
uint32_t xtensa_tlb_get_addr_mask(const CPUXtensaState *env, bool dtlb, uint32_t way);
void split_tlb_entry_spec_way(const CPUXtensaState *env, uint32_t v, bool dtlb,
uint32_t *vpn, uint32_t wi, uint32_t *ei);
int xtensa_tlb_lookup(const CPUXtensaState *env, uint32_t addr, bool dtlb,
uint32_t *pwi, uint32_t *pei, uint8_t *pring);
void xtensa_tlb_set_entry_mmu(const CPUXtensaState *env,
xtensa_tlb_entry *entry, bool dtlb,
unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
void xtensa_tlb_set_entry(CPUXtensaState *env, bool dtlb,
unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb,
uint32_t vaddr, int is_write, int mmu_idx,
uint32_t *paddr, uint32_t *page_size, unsigned *access);
void reset_mmu(CPUXtensaState *env);
void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUXtensaState *env);
void debug_exception_env(CPUXtensaState *new_env, uint32_t cause);
#define XTENSA_OPTION_BIT(opt) (((uint64_t)1) << (opt))
#define XTENSA_OPTION_ALL (~(uint64_t)0)
static inline bool xtensa_option_bits_enabled(const XtensaConfig *config,
uint64_t opt)
{
return (config->options & opt) != 0;
}
static inline bool xtensa_option_enabled(const XtensaConfig *config, int opt)
{
return xtensa_option_bits_enabled(config, XTENSA_OPTION_BIT(opt));
}
static inline int xtensa_get_cintlevel(const CPUXtensaState *env)
{
int level = (env->sregs[PS] & PS_INTLEVEL) >> PS_INTLEVEL_SHIFT;
if ((env->sregs[PS] & PS_EXCM) && env->config->excm_level > level) {
level = env->config->excm_level;
}
return level;
}
static inline int xtensa_get_ring(const CPUXtensaState *env)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
} else {
return 0;
}
}
static inline int xtensa_get_cring(const CPUXtensaState *env)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU) &&
(env->sregs[PS] & PS_EXCM) == 0) {
return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
} else {
return 0;
}
}
static inline xtensa_tlb_entry *xtensa_tlb_get_entry(CPUXtensaState *env,
bool dtlb, unsigned wi, unsigned ei)
{
return dtlb ?
env->dtlb[wi] + ei :
env->itlb[wi] + ei;
}
static inline uint32_t xtensa_replicate_windowstart(CPUXtensaState *env)
{
return env->sregs[WINDOW_START] |
(env->sregs[WINDOW_START] << env->config->nareg / 4);
}
/* MMU modes definitions */
#define MMU_MODE0_SUFFIX _ring0
#define MMU_MODE1_SUFFIX _ring1
#define MMU_MODE2_SUFFIX _ring2
#define MMU_MODE3_SUFFIX _ring3
static inline int cpu_mmu_index(CPUXtensaState *env)
{
return xtensa_get_cring(env);
}
#define XTENSA_TBFLAG_RING_MASK 0x3
#define XTENSA_TBFLAG_EXCM 0x4
#define XTENSA_TBFLAG_LITBASE 0x8
#define XTENSA_TBFLAG_DEBUG 0x10
#define XTENSA_TBFLAG_ICOUNT 0x20
#define XTENSA_TBFLAG_CPENABLE_MASK 0x3fc0
#define XTENSA_TBFLAG_CPENABLE_SHIFT 6
#define XTENSA_TBFLAG_EXCEPTION 0x4000
static inline void cpu_get_tb_cpu_state(CPUXtensaState *env, target_ulong *pc,
target_ulong *cs_base, int *flags)
{
CPUState *cs = CPU(xtensa_env_get_cpu(env));
*pc = env->pc;
*cs_base = 0;
*flags = 0;
*flags |= xtensa_get_ring(env);
if (env->sregs[PS] & PS_EXCM) {
*flags |= XTENSA_TBFLAG_EXCM;
}
if (xtensa_option_enabled(env->config, XTENSA_OPTION_EXTENDED_L32R) &&
(env->sregs[LITBASE] & 1)) {
*flags |= XTENSA_TBFLAG_LITBASE;
}
if (xtensa_option_enabled(env->config, XTENSA_OPTION_DEBUG)) {
if (xtensa_get_cintlevel(env) < env->config->debug_level) {
*flags |= XTENSA_TBFLAG_DEBUG;
}
if (xtensa_get_cintlevel(env) < env->sregs[ICOUNTLEVEL]) {
*flags |= XTENSA_TBFLAG_ICOUNT;
}
}
if (xtensa_option_enabled(env->config, XTENSA_OPTION_COPROCESSOR)) {
*flags |= env->sregs[CPENABLE] << XTENSA_TBFLAG_CPENABLE_SHIFT;
}
if (cs->singlestep_enabled && env->exception_taken) {
*flags |= XTENSA_TBFLAG_EXCEPTION;
}
}
#include "exec/cpu-all.h"
#include "exec/exec-all.h"
#endif
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