2 * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the Open Source and Linux Lab nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include "exec/cpu-defs.h"
33 #include "xtensa-isa.h"
35 /* Xtensa processors have a weak memory model */
36 #define TCG_GUEST_DEFAULT_MO (0)
39 /* Additional instructions */
40 XTENSA_OPTION_CODE_DENSITY
,
42 XTENSA_OPTION_EXTENDED_L32R
,
43 XTENSA_OPTION_16_BIT_IMUL
,
44 XTENSA_OPTION_32_BIT_IMUL
,
45 XTENSA_OPTION_32_BIT_IMUL_HIGH
,
46 XTENSA_OPTION_32_BIT_IDIV
,
48 XTENSA_OPTION_MISC_OP_NSA
,
49 XTENSA_OPTION_MISC_OP_MINMAX
,
50 XTENSA_OPTION_MISC_OP_SEXT
,
51 XTENSA_OPTION_MISC_OP_CLAMPS
,
52 XTENSA_OPTION_COPROCESSOR
,
53 XTENSA_OPTION_BOOLEAN
,
54 XTENSA_OPTION_FP_COPROCESSOR
,
55 XTENSA_OPTION_MP_SYNCHRO
,
56 XTENSA_OPTION_CONDITIONAL_STORE
,
57 XTENSA_OPTION_ATOMCTL
,
58 XTENSA_OPTION_DEPBITS
,
60 /* Interrupts and exceptions */
61 XTENSA_OPTION_EXCEPTION
,
62 XTENSA_OPTION_RELOCATABLE_VECTOR
,
63 XTENSA_OPTION_UNALIGNED_EXCEPTION
,
64 XTENSA_OPTION_INTERRUPT
,
65 XTENSA_OPTION_HIGH_PRIORITY_INTERRUPT
,
66 XTENSA_OPTION_TIMER_INTERRUPT
,
70 XTENSA_OPTION_ICACHE_TEST
,
71 XTENSA_OPTION_ICACHE_INDEX_LOCK
,
73 XTENSA_OPTION_DCACHE_TEST
,
74 XTENSA_OPTION_DCACHE_INDEX_LOCK
,
80 XTENSA_OPTION_HW_ALIGNMENT
,
81 XTENSA_OPTION_MEMORY_ECC_PARITY
,
83 /* Memory protection and translation */
84 XTENSA_OPTION_REGION_PROTECTION
,
85 XTENSA_OPTION_REGION_TRANSLATION
,
88 XTENSA_OPTION_CACHEATTR
,
91 XTENSA_OPTION_WINDOWED_REGISTER
,
92 XTENSA_OPTION_PROCESSOR_INTERFACE
,
93 XTENSA_OPTION_MISC_SR
,
94 XTENSA_OPTION_THREAD_POINTER
,
95 XTENSA_OPTION_PROCESSOR_ID
,
97 XTENSA_OPTION_TRACE_PORT
,
98 XTENSA_OPTION_EXTERN_REGS
,
168 #define PS_INTLEVEL 0xf
169 #define PS_INTLEVEL_SHIFT 0
175 #define PS_RING_SHIFT 6
178 #define PS_OWB_SHIFT 8
181 #define PS_CALLINC 0x30000
182 #define PS_CALLINC_SHIFT 16
183 #define PS_CALLINC_LEN 2
185 #define PS_WOE 0x40000
187 #define DEBUGCAUSE_IC 0x1
188 #define DEBUGCAUSE_IB 0x2
189 #define DEBUGCAUSE_DB 0x4
190 #define DEBUGCAUSE_BI 0x8
191 #define DEBUGCAUSE_BN 0x10
192 #define DEBUGCAUSE_DI 0x20
193 #define DEBUGCAUSE_DBNUM 0xf00
194 #define DEBUGCAUSE_DBNUM_SHIFT 8
196 #define DBREAKC_SB 0x80000000
197 #define DBREAKC_LB 0x40000000
198 #define DBREAKC_SB_LB (DBREAKC_SB | DBREAKC_LB)
199 #define DBREAKC_MASK 0x3f
201 #define MEMCTL_INIT 0x00800000
202 #define MEMCTL_IUSEWAYS_SHIFT 18
203 #define MEMCTL_IUSEWAYS_LEN 5
204 #define MEMCTL_IUSEWAYS_MASK 0x007c0000
205 #define MEMCTL_DALLOCWAYS_SHIFT 13
206 #define MEMCTL_DALLOCWAYS_LEN 5
207 #define MEMCTL_DALLOCWAYS_MASK 0x0003e000
208 #define MEMCTL_DUSEWAYS_SHIFT 8
209 #define MEMCTL_DUSEWAYS_LEN 5
210 #define MEMCTL_DUSEWAYS_MASK 0x00001f00
211 #define MEMCTL_ISNP 0x4
212 #define MEMCTL_DSNP 0x2
213 #define MEMCTL_IL0EN 0x1
215 #define MAX_INSN_LENGTH 64
216 #define MAX_INSN_SLOTS 32
217 #define MAX_OPCODE_ARGS 16
219 #define MAX_NINTERRUPT 32
222 #define MAX_NCCOMPARE 3
223 #define MAX_TLB_WAY_SIZE 8
224 #define MAX_NDBREAK 2
225 #define MAX_NMEMORY 4
226 #define MAX_MPU_FOREGROUND_SEGMENTS 32
228 #define REGION_PAGE_MASK 0xe0000000
230 #define PAGE_CACHE_MASK 0x700
231 #define PAGE_CACHE_SHIFT 8
232 #define PAGE_CACHE_INVALID 0x000
233 #define PAGE_CACHE_BYPASS 0x100
234 #define PAGE_CACHE_WT 0x200
235 #define PAGE_CACHE_WB 0x400
236 #define PAGE_CACHE_ISOLATE 0x600
244 /* Dynamic vectors */
245 EXC_WINDOW_OVERFLOW4
,
246 EXC_WINDOW_UNDERFLOW4
,
247 EXC_WINDOW_OVERFLOW8
,
248 EXC_WINDOW_UNDERFLOW8
,
249 EXC_WINDOW_OVERFLOW12
,
250 EXC_WINDOW_UNDERFLOW12
,
260 ILLEGAL_INSTRUCTION_CAUSE
= 0,
262 INSTRUCTION_FETCH_ERROR_CAUSE
,
263 LOAD_STORE_ERROR_CAUSE
,
264 LEVEL1_INTERRUPT_CAUSE
,
266 INTEGER_DIVIDE_BY_ZERO_CAUSE
,
267 PC_VALUE_ERROR_CAUSE
,
269 LOAD_STORE_ALIGNMENT_CAUSE
,
270 EXTERNAL_REG_PRIVILEGE_CAUSE
,
271 EXCLUSIVE_ERROR_CAUSE
,
272 INSTR_PIF_DATA_ERROR_CAUSE
,
273 LOAD_STORE_PIF_DATA_ERROR_CAUSE
,
274 INSTR_PIF_ADDR_ERROR_CAUSE
,
275 LOAD_STORE_PIF_ADDR_ERROR_CAUSE
,
277 INST_TLB_MULTI_HIT_CAUSE
,
278 INST_FETCH_PRIVILEGE_CAUSE
,
279 INST_FETCH_PROHIBITED_CAUSE
= 20,
280 LOAD_STORE_TLB_MISS_CAUSE
= 24,
281 LOAD_STORE_TLB_MULTI_HIT_CAUSE
,
282 LOAD_STORE_PRIVILEGE_CAUSE
,
283 LOAD_PROHIBITED_CAUSE
= 28,
284 STORE_PROHIBITED_CAUSE
,
286 COPROCESSOR0_DISABLED
= 32,
304 struct CPUXtensaState
;
306 typedef struct xtensa_tlb_entry
{
314 typedef struct xtensa_tlb
{
316 const unsigned way_size
[10];
318 unsigned nrefillentries
;
321 typedef struct xtensa_mpu_entry
{
326 typedef struct XtensaGdbReg
{
334 typedef struct XtensaGdbRegmap
{
337 /* PC + a + ar + sr + ur */
338 XtensaGdbReg reg
[1 + 16 + 64 + 256 + 256];
341 typedef struct XtensaCcompareTimer
{
342 struct CPUXtensaState
*env
;
344 } XtensaCcompareTimer
;
346 typedef struct XtensaMemory
{
348 struct XtensaMemoryRegion
{
351 } location
[MAX_NMEMORY
];
354 typedef struct opcode_arg
{
361 typedef struct DisasContext DisasContext
;
362 typedef void (*XtensaOpcodeOp
)(DisasContext
*dc
, const OpcodeArg arg
[],
363 const uint32_t par
[]);
364 typedef bool (*XtensaOpcodeBoolTest
)(DisasContext
*dc
,
365 const OpcodeArg arg
[],
366 const uint32_t par
[]);
367 typedef uint32_t (*XtensaOpcodeUintTest
)(DisasContext
*dc
,
368 const OpcodeArg arg
[],
369 const uint32_t par
[]);
373 XTENSA_OP_PRIVILEGED
= 0x2,
374 XTENSA_OP_SYSCALL
= 0x4,
375 XTENSA_OP_DEBUG_BREAK
= 0x8,
377 XTENSA_OP_OVERFLOW
= 0x10,
378 XTENSA_OP_UNDERFLOW
= 0x20,
379 XTENSA_OP_ALLOCA
= 0x40,
380 XTENSA_OP_COPROCESSOR
= 0x80,
382 XTENSA_OP_DIVIDE_BY_ZERO
= 0x100,
384 /* Postprocessing flags */
385 XTENSA_OP_CHECK_INTERRUPTS
= 0x200,
386 XTENSA_OP_EXIT_TB_M1
= 0x400,
387 XTENSA_OP_EXIT_TB_0
= 0x800,
388 XTENSA_OP_SYNC_REGISTER_WINDOW
= 0x1000,
390 XTENSA_OP_POSTPROCESS
=
391 XTENSA_OP_CHECK_INTERRUPTS
|
392 XTENSA_OP_EXIT_TB_M1
|
393 XTENSA_OP_EXIT_TB_0
|
394 XTENSA_OP_SYNC_REGISTER_WINDOW
,
396 XTENSA_OP_NAME_ARRAY
= 0x8000,
398 XTENSA_OP_CONTROL_FLOW
= 0x10000,
399 XTENSA_OP_STORE
= 0x20000,
400 XTENSA_OP_LOAD
= 0x40000,
401 XTENSA_OP_LOAD_STORE
=
402 XTENSA_OP_LOAD
| XTENSA_OP_STORE
,
405 typedef struct XtensaOpcodeOps
{
407 XtensaOpcodeOp translate
;
408 XtensaOpcodeBoolTest test_ill
;
409 XtensaOpcodeUintTest test_overflow
;
412 uint32_t coprocessor
;
415 typedef struct XtensaOpcodeTranslators
{
416 unsigned num_opcodes
;
417 const XtensaOpcodeOps
*opcode
;
418 } XtensaOpcodeTranslators
;
420 extern const XtensaOpcodeTranslators xtensa_core_opcodes
;
421 extern const XtensaOpcodeTranslators xtensa_fpu2000_opcodes
;
423 struct XtensaConfig
{
426 XtensaGdbRegmap gdb_regmap
;
430 unsigned inst_fetch_width
;
431 unsigned max_insn_size
;
433 uint32_t exception_vector
[EXC_MAX
];
436 uint32_t interrupt_vector
[MAX_NLEVEL
+ MAX_NNMI
+ 1];
437 uint32_t level_mask
[MAX_NLEVEL
+ MAX_NNMI
+ 1];
438 uint32_t inttype_mask
[INTTYPE_MAX
];
441 interrupt_type inttype
;
442 } interrupt
[MAX_NINTERRUPT
];
444 uint32_t timerint
[MAX_NCCOMPARE
];
446 unsigned extint
[MAX_NINTERRUPT
];
448 unsigned debug_level
;
452 unsigned icache_ways
;
453 unsigned dcache_ways
;
454 unsigned dcache_line_bytes
;
455 uint32_t memctl_mask
;
457 XtensaMemory instrom
;
458 XtensaMemory instram
;
459 XtensaMemory datarom
;
460 XtensaMemory dataram
;
464 uint32_t configid
[2];
468 XtensaOpcodeOps
**opcode_ops
;
469 const XtensaOpcodeTranslators
**opcode_translators
;
470 xtensa_regfile a_regfile
;
473 uint32_t clock_freq_khz
;
479 unsigned n_mpu_fg_segments
;
480 unsigned n_mpu_bg_segments
;
481 const xtensa_mpu_entry
*mpu_bg
;
484 typedef struct XtensaConfigList
{
485 const XtensaConfig
*config
;
486 struct XtensaConfigList
*next
;
489 #ifdef HOST_WORDS_BIGENDIAN
501 typedef struct CPUXtensaState
{
502 const XtensaConfig
*config
;
507 uint32_t phys_regs
[MAX_NAREG
];
512 float_status fp_status
;
513 uint32_t windowbase_next
;
514 uint32_t exclusive_addr
;
515 uint32_t exclusive_val
;
517 #ifndef CONFIG_USER_ONLY
518 xtensa_tlb_entry itlb
[7][MAX_TLB_WAY_SIZE
];
519 xtensa_tlb_entry dtlb
[10][MAX_TLB_WAY_SIZE
];
520 xtensa_mpu_entry mpu_fg
[MAX_MPU_FOREGROUND_SEGMENTS
];
521 unsigned autorefill_idx
;
523 AddressSpace
*address_space_er
;
524 MemoryRegion
*system_er
;
525 int pending_irq_level
; /* level of last raised IRQ */
526 qemu_irq
*irq_inputs
;
527 qemu_irq ext_irq_inputs
[MAX_NINTERRUPT
];
528 qemu_irq runstall_irq
;
529 XtensaCcompareTimer ccompare
[MAX_NCCOMPARE
];
531 uint64_t ccount_time
;
532 uint32_t ccount_base
;
537 unsigned static_vectors
;
539 /* Watchpoints for DBREAK registers */
540 struct CPUWatchpoint
*cpu_watchpoint
[MAX_NDBREAK
];
545 * @env: #CPUXtensaState
554 CPUNegativeOffsetState neg
;
559 bool xtensa_cpu_tlb_fill(CPUState
*cs
, vaddr address
, int size
,
560 MMUAccessType access_type
, int mmu_idx
,
561 bool probe
, uintptr_t retaddr
);
562 void xtensa_cpu_do_interrupt(CPUState
*cpu
);
563 bool xtensa_cpu_exec_interrupt(CPUState
*cpu
, int interrupt_request
);
564 void xtensa_cpu_do_transaction_failed(CPUState
*cs
, hwaddr physaddr
, vaddr addr
,
565 unsigned size
, MMUAccessType access_type
,
566 int mmu_idx
, MemTxAttrs attrs
,
567 MemTxResult response
, uintptr_t retaddr
);
568 void xtensa_cpu_dump_state(CPUState
*cpu
, FILE *f
, int flags
);
569 hwaddr
xtensa_cpu_get_phys_page_debug(CPUState
*cpu
, vaddr addr
);
570 void xtensa_count_regs(const XtensaConfig
*config
,
571 unsigned *n_regs
, unsigned *n_core_regs
);
572 int xtensa_cpu_gdb_read_register(CPUState
*cpu
, uint8_t *buf
, int reg
);
573 int xtensa_cpu_gdb_write_register(CPUState
*cpu
, uint8_t *buf
, int reg
);
574 void xtensa_cpu_do_unaligned_access(CPUState
*cpu
, vaddr addr
,
575 MMUAccessType access_type
,
576 int mmu_idx
, uintptr_t retaddr
);
578 #define cpu_signal_handler cpu_xtensa_signal_handler
579 #define cpu_list xtensa_cpu_list
581 #define XTENSA_CPU_TYPE_SUFFIX "-" TYPE_XTENSA_CPU
582 #define XTENSA_CPU_TYPE_NAME(model) model XTENSA_CPU_TYPE_SUFFIX
583 #define CPU_RESOLVING_TYPE TYPE_XTENSA_CPU
585 #ifdef TARGET_WORDS_BIGENDIAN
586 #define XTENSA_DEFAULT_CPU_MODEL "fsf"
587 #define XTENSA_DEFAULT_CPU_NOMMU_MODEL "fsf"
589 #define XTENSA_DEFAULT_CPU_MODEL "dc232b"
590 #define XTENSA_DEFAULT_CPU_NOMMU_MODEL "de212"
592 #define XTENSA_DEFAULT_CPU_TYPE \
593 XTENSA_CPU_TYPE_NAME(XTENSA_DEFAULT_CPU_MODEL)
594 #define XTENSA_DEFAULT_CPU_NOMMU_TYPE \
595 XTENSA_CPU_TYPE_NAME(XTENSA_DEFAULT_CPU_NOMMU_MODEL)
597 void xtensa_collect_sr_names(const XtensaConfig
*config
);
598 void xtensa_translate_init(void);
599 void **xtensa_get_regfile_by_name(const char *name
);
600 void xtensa_breakpoint_handler(CPUState
*cs
);
601 void xtensa_register_core(XtensaConfigList
*node
);
602 void xtensa_sim_open_console(Chardev
*chr
);
603 void check_interrupts(CPUXtensaState
*s
);
604 void xtensa_irq_init(CPUXtensaState
*env
);
605 qemu_irq
*xtensa_get_extints(CPUXtensaState
*env
);
606 qemu_irq
xtensa_get_runstall(CPUXtensaState
*env
);
607 int cpu_xtensa_signal_handler(int host_signum
, void *pinfo
, void *puc
);
608 void xtensa_cpu_list(void);
609 void xtensa_sync_window_from_phys(CPUXtensaState
*env
);
610 void xtensa_sync_phys_from_window(CPUXtensaState
*env
);
611 void xtensa_rotate_window(CPUXtensaState
*env
, uint32_t delta
);
612 void xtensa_restore_owb(CPUXtensaState
*env
);
613 void debug_exception_env(CPUXtensaState
*new_env
, uint32_t cause
);
615 static inline void xtensa_select_static_vectors(CPUXtensaState
*env
,
619 env
->static_vectors
= n
;
621 void xtensa_runstall(CPUXtensaState
*env
, bool runstall
);
623 #define XTENSA_OPTION_BIT(opt) (((uint64_t)1) << (opt))
624 #define XTENSA_OPTION_ALL (~(uint64_t)0)
626 static inline bool xtensa_option_bits_enabled(const XtensaConfig
*config
,
629 return (config
->options
& opt
) != 0;
632 static inline bool xtensa_option_enabled(const XtensaConfig
*config
, int opt
)
634 return xtensa_option_bits_enabled(config
, XTENSA_OPTION_BIT(opt
));
637 static inline int xtensa_get_cintlevel(const CPUXtensaState
*env
)
639 int level
= (env
->sregs
[PS
] & PS_INTLEVEL
) >> PS_INTLEVEL_SHIFT
;
640 if ((env
->sregs
[PS
] & PS_EXCM
) && env
->config
->excm_level
> level
) {
641 level
= env
->config
->excm_level
;
646 static inline int xtensa_get_ring(const CPUXtensaState
*env
)
648 if (xtensa_option_bits_enabled(env
->config
,
649 XTENSA_OPTION_BIT(XTENSA_OPTION_MMU
) |
650 XTENSA_OPTION_BIT(XTENSA_OPTION_MPU
))) {
651 return (env
->sregs
[PS
] & PS_RING
) >> PS_RING_SHIFT
;
657 static inline int xtensa_get_cring(const CPUXtensaState
*env
)
659 if (xtensa_option_bits_enabled(env
->config
,
660 XTENSA_OPTION_BIT(XTENSA_OPTION_MMU
) |
661 XTENSA_OPTION_BIT(XTENSA_OPTION_MPU
)) &&
662 (env
->sregs
[PS
] & PS_EXCM
) == 0) {
663 return (env
->sregs
[PS
] & PS_RING
) >> PS_RING_SHIFT
;
669 #ifndef CONFIG_USER_ONLY
670 int xtensa_get_physical_addr(CPUXtensaState
*env
, bool update_tlb
,
671 uint32_t vaddr
, int is_write
, int mmu_idx
,
672 uint32_t *paddr
, uint32_t *page_size
, unsigned *access
);
673 void reset_mmu(CPUXtensaState
*env
);
674 void dump_mmu(CPUXtensaState
*env
);
676 static inline MemoryRegion
*xtensa_get_er_region(CPUXtensaState
*env
)
678 return env
->system_er
;
681 void xtensa_set_abi_call0(void);
682 bool xtensa_abi_call0(void);
685 static inline uint32_t xtensa_replicate_windowstart(CPUXtensaState
*env
)
687 return env
->sregs
[WINDOW_START
] |
688 (env
->sregs
[WINDOW_START
] << env
->config
->nareg
/ 4);
691 /* MMU modes definitions */
692 #define MMU_MODE0_SUFFIX _ring0
693 #define MMU_MODE1_SUFFIX _ring1
694 #define MMU_MODE2_SUFFIX _ring2
695 #define MMU_MODE3_SUFFIX _ring3
696 #define MMU_USER_IDX 3
698 static inline int cpu_mmu_index(CPUXtensaState
*env
, bool ifetch
)
700 return xtensa_get_cring(env
);
703 #define XTENSA_TBFLAG_RING_MASK 0x3
704 #define XTENSA_TBFLAG_EXCM 0x4
705 #define XTENSA_TBFLAG_LITBASE 0x8
706 #define XTENSA_TBFLAG_DEBUG 0x10
707 #define XTENSA_TBFLAG_ICOUNT 0x20
708 #define XTENSA_TBFLAG_CPENABLE_MASK 0x3fc0
709 #define XTENSA_TBFLAG_CPENABLE_SHIFT 6
710 #define XTENSA_TBFLAG_EXCEPTION 0x4000
711 #define XTENSA_TBFLAG_WINDOW_MASK 0x18000
712 #define XTENSA_TBFLAG_WINDOW_SHIFT 15
713 #define XTENSA_TBFLAG_YIELD 0x20000
714 #define XTENSA_TBFLAG_CWOE 0x40000
715 #define XTENSA_TBFLAG_CALLINC_MASK 0x180000
716 #define XTENSA_TBFLAG_CALLINC_SHIFT 19
718 #define XTENSA_CSBASE_LEND_MASK 0x0000ffff
719 #define XTENSA_CSBASE_LEND_SHIFT 0
720 #define XTENSA_CSBASE_LBEG_OFF_MASK 0x00ff0000
721 #define XTENSA_CSBASE_LBEG_OFF_SHIFT 16
723 typedef CPUXtensaState CPUArchState
;
724 typedef XtensaCPU ArchCPU
;
726 #include "exec/cpu-all.h"
728 static inline void cpu_get_tb_cpu_state(CPUXtensaState
*env
, target_ulong
*pc
,
729 target_ulong
*cs_base
, uint32_t *flags
)
731 CPUState
*cs
= env_cpu(env
);
736 *flags
|= xtensa_get_ring(env
);
737 if (env
->sregs
[PS
] & PS_EXCM
) {
738 *flags
|= XTENSA_TBFLAG_EXCM
;
739 } else if (xtensa_option_enabled(env
->config
, XTENSA_OPTION_LOOP
)) {
740 target_ulong lend_dist
=
741 env
->sregs
[LEND
] - (env
->pc
& -(1u << TARGET_PAGE_BITS
));
744 * 0 in the csbase_lend field means that there may not be a loopback
745 * for any instruction that starts inside this page. Any other value
746 * means that an instruction that ends at this offset from the page
747 * start may loop back and will need loopback code to be generated.
749 * lend_dist is 0 when LEND points to the start of the page, but
750 * no instruction that starts inside this page may end at offset 0,
751 * so it's still correct.
753 * When an instruction ends at a page boundary it may only start in
754 * the previous page. lend_dist will be encoded as TARGET_PAGE_SIZE
755 * for the TB that contains this instruction.
757 if (lend_dist
< (1u << TARGET_PAGE_BITS
) + env
->config
->max_insn_size
) {
758 target_ulong lbeg_off
= env
->sregs
[LEND
] - env
->sregs
[LBEG
];
760 *cs_base
= lend_dist
;
761 if (lbeg_off
< 256) {
762 *cs_base
|= lbeg_off
<< XTENSA_CSBASE_LBEG_OFF_SHIFT
;
766 if (xtensa_option_enabled(env
->config
, XTENSA_OPTION_EXTENDED_L32R
) &&
767 (env
->sregs
[LITBASE
] & 1)) {
768 *flags
|= XTENSA_TBFLAG_LITBASE
;
770 if (xtensa_option_enabled(env
->config
, XTENSA_OPTION_DEBUG
)) {
771 if (xtensa_get_cintlevel(env
) < env
->config
->debug_level
) {
772 *flags
|= XTENSA_TBFLAG_DEBUG
;
774 if (xtensa_get_cintlevel(env
) < env
->sregs
[ICOUNTLEVEL
]) {
775 *flags
|= XTENSA_TBFLAG_ICOUNT
;
778 if (xtensa_option_enabled(env
->config
, XTENSA_OPTION_COPROCESSOR
)) {
779 *flags
|= env
->sregs
[CPENABLE
] << XTENSA_TBFLAG_CPENABLE_SHIFT
;
781 if (cs
->singlestep_enabled
&& env
->exception_taken
) {
782 *flags
|= XTENSA_TBFLAG_EXCEPTION
;
784 if (xtensa_option_enabled(env
->config
, XTENSA_OPTION_WINDOWED_REGISTER
) &&
785 (env
->sregs
[PS
] & (PS_WOE
| PS_EXCM
)) == PS_WOE
) {
786 uint32_t windowstart
= xtensa_replicate_windowstart(env
) >>
787 (env
->sregs
[WINDOW_BASE
] + 1);
788 uint32_t w
= ctz32(windowstart
| 0x8);
790 *flags
|= (w
<< XTENSA_TBFLAG_WINDOW_SHIFT
) | XTENSA_TBFLAG_CWOE
;
791 *flags
|= extract32(env
->sregs
[PS
], PS_CALLINC_SHIFT
,
792 PS_CALLINC_LEN
) << XTENSA_TBFLAG_CALLINC_SHIFT
;
794 *flags
|= 3 << XTENSA_TBFLAG_WINDOW_SHIFT
;
796 if (env
->yield_needed
) {
797 *flags
|= XTENSA_TBFLAG_YIELD
;