1 #ifndef TARGET_ARM_TRANSLATE_H
2 #define TARGET_ARM_TRANSLATE_H
4 #include "exec/translator.h"
9 typedef struct DisasContext
{
10 DisasContextBase base
;
11 const ARMISARegisters
*isar
;
13 /* The address of the current instruction being translated. */
15 target_ulong page_start
;
17 /* Nonzero if this instruction has been conditionally skipped. */
19 /* The label that will be jumped to when the instruction is skipped. */
21 /* Thumb-2 conditional execution bits. */
27 #if !defined(CONFIG_USER_ONLY)
30 ARMMMUIdx mmu_idx
; /* MMU index to use for normal loads/stores */
31 uint8_t tbii
; /* TBI1|TBI0 for insns */
32 uint8_t tbid
; /* TBI1|TBI0 for data */
33 bool ns
; /* Use non-secure CPREG bank on access */
34 int fp_excp_el
; /* FP exception EL or 0 if enabled */
35 int sve_excp_el
; /* SVE exception EL or 0 if enabled */
36 int sve_len
; /* SVE vector length in bytes */
37 /* Flag indicating that exceptions from secure mode are routed to EL3. */
38 bool secure_routed_to_el3
;
39 bool vfp_enabled
; /* FP enabled via FPSCR.EN */
42 bool v7m_handler_mode
;
43 bool v8m_secure
; /* true if v8M and we're in Secure mode */
44 bool v8m_stackcheck
; /* true if we need to perform v8M stack limit checks */
45 bool v8m_fpccr_s_wrong
; /* true if v8M FPCCR.S != v8m_secure */
46 bool v7m_new_fp_ctxt_needed
; /* ASPEN set but no active FP context */
47 bool v7m_lspact
; /* FPCCR.LSPACT set */
48 /* Immediate value in AArch32 SVC insn; must be set if is_jmp == DISAS_SWI
49 * so that top level loop can generate correct syndrome information.
54 /* Debug target exception level for single-step exceptions */
57 uint64_t features
; /* CPU features bits */
58 /* Because unallocated encodings generate different exception syndrome
59 * information from traps due to FP being disabled, we can't do a single
60 * "is fp access disabled" check at a high level in the decode tree.
61 * To help in catching bugs where the access check was forgotten in some
62 * code path, we set this flag when the access check is done, and assert
63 * that it is set at the point where we actually touch the FP regs.
65 bool fp_access_checked
;
66 /* ARMv8 single-step state (this is distinct from the QEMU gdbstub
67 * single-step support).
71 /* True if the insn just emitted was a load-exclusive instruction
72 * (necessary for syndrome information for single step exceptions),
73 * ie A64 LDX*, LDAX*, A32/T32 LDREX*, LDAEX*.
76 /* True if v8.3-PAuth is active. */
78 /* True with v8.5-BTI and SCTLR_ELx.BT* set. */
80 /* True if any CP15 access is trapped by HSTR_EL2 */
83 * >= 0, a copy of PSTATE.BTYPE, which will be 0 without v8.5-BTI.
84 * < 0, set by the current instruction.
87 /* True if this page is guarded. */
89 /* Bottom two bits of XScale c15_cpar coprocessor access control reg */
91 /* TCG op of the current insn_start. */
93 #define TMP_A64_MAX 16
95 TCGv_i64 tmp_a64
[TMP_A64_MAX
];
98 typedef struct DisasCompare
{
104 /* Share the TCG temporaries common between 32 and 64 bit modes. */
105 extern TCGv_i32 cpu_NF
, cpu_ZF
, cpu_CF
, cpu_VF
;
106 extern TCGv_i64 cpu_exclusive_addr
;
107 extern TCGv_i64 cpu_exclusive_val
;
109 static inline int arm_dc_feature(DisasContext
*dc
, int feature
)
111 return (dc
->features
& (1ULL << feature
)) != 0;
114 static inline int get_mem_index(DisasContext
*s
)
116 return arm_to_core_mmu_idx(s
->mmu_idx
);
119 /* Function used to determine the target exception EL when otherwise not known
122 static inline int default_exception_el(DisasContext
*s
)
124 /* If we are coming from secure EL0 in a system with a 32-bit EL3, then
125 * there is no secure EL1, so we route exceptions to EL3. Otherwise,
126 * exceptions can only be routed to ELs above 1, so we target the higher of
127 * 1 or the current EL.
129 return (s
->mmu_idx
== ARMMMUIdx_S1SE0
&& s
->secure_routed_to_el3
)
130 ? 3 : MAX(1, s
->current_el
);
133 static inline void disas_set_insn_syndrome(DisasContext
*s
, uint32_t syn
)
135 /* We don't need to save all of the syndrome so we mask and shift
136 * out unneeded bits to help the sleb128 encoder do a better job.
138 syn
&= ARM_INSN_START_WORD2_MASK
;
139 syn
>>= ARM_INSN_START_WORD2_SHIFT
;
141 /* We check and clear insn_start_idx to catch multiple updates. */
142 assert(s
->insn_start
!= NULL
);
143 tcg_set_insn_start_param(s
->insn_start
, 2, syn
);
144 s
->insn_start
= NULL
;
147 /* is_jmp field values */
148 #define DISAS_JUMP DISAS_TARGET_0 /* only pc was modified dynamically */
149 #define DISAS_UPDATE DISAS_TARGET_1 /* cpu state was modified dynamically */
150 /* These instructions trap after executing, so the A32/T32 decoder must
151 * defer them until after the conditional execution state has been updated.
152 * WFI also needs special handling when single-stepping.
154 #define DISAS_WFI DISAS_TARGET_2
155 #define DISAS_SWI DISAS_TARGET_3
157 #define DISAS_WFE DISAS_TARGET_4
158 #define DISAS_HVC DISAS_TARGET_5
159 #define DISAS_SMC DISAS_TARGET_6
160 #define DISAS_YIELD DISAS_TARGET_7
161 /* M profile branch which might be an exception return (and so needs
162 * custom end-of-TB code)
164 #define DISAS_BX_EXCRET DISAS_TARGET_8
165 /* For instructions which want an immediate exit to the main loop,
166 * as opposed to attempting to use lookup_and_goto_ptr. Unlike
167 * DISAS_UPDATE this doesn't write the PC on exiting the translation
168 * loop so you need to ensure something (gen_a64_set_pc_im or runtime
169 * helper) has done so before we reach return from cpu_tb_exec.
171 #define DISAS_EXIT DISAS_TARGET_9
173 #ifdef TARGET_AARCH64
174 void a64_translate_init(void);
175 void gen_a64_set_pc_im(uint64_t val
);
176 extern const TranslatorOps aarch64_translator_ops
;
178 static inline void a64_translate_init(void)
182 static inline void gen_a64_set_pc_im(uint64_t val
)
187 void arm_test_cc(DisasCompare
*cmp
, int cc
);
188 void arm_free_cc(DisasCompare
*cmp
);
189 void arm_jump_cc(DisasCompare
*cmp
, TCGLabel
*label
);
190 void arm_gen_test_cc(int cc
, TCGLabel
*label
);
192 /* Return state of Alternate Half-precision flag, caller frees result */
193 static inline TCGv_i32
get_ahp_flag(void)
195 TCGv_i32 ret
= tcg_temp_new_i32();
197 tcg_gen_ld_i32(ret
, cpu_env
,
198 offsetof(CPUARMState
, vfp
.xregs
[ARM_VFP_FPSCR
]));
199 tcg_gen_extract_i32(ret
, ret
, 26, 1);
204 /* Set bits within PSTATE. */
205 static inline void set_pstate_bits(uint32_t bits
)
207 TCGv_i32 p
= tcg_temp_new_i32();
209 tcg_debug_assert(!(bits
& CACHED_PSTATE_BITS
));
211 tcg_gen_ld_i32(p
, cpu_env
, offsetof(CPUARMState
, pstate
));
212 tcg_gen_ori_i32(p
, p
, bits
);
213 tcg_gen_st_i32(p
, cpu_env
, offsetof(CPUARMState
, pstate
));
214 tcg_temp_free_i32(p
);
217 /* Clear bits within PSTATE. */
218 static inline void clear_pstate_bits(uint32_t bits
)
220 TCGv_i32 p
= tcg_temp_new_i32();
222 tcg_debug_assert(!(bits
& CACHED_PSTATE_BITS
));
224 tcg_gen_ld_i32(p
, cpu_env
, offsetof(CPUARMState
, pstate
));
225 tcg_gen_andi_i32(p
, p
, ~bits
);
226 tcg_gen_st_i32(p
, cpu_env
, offsetof(CPUARMState
, pstate
));
227 tcg_temp_free_i32(p
);
230 /* If the singlestep state is Active-not-pending, advance to Active-pending. */
231 static inline void gen_ss_advance(DisasContext
*s
)
235 clear_pstate_bits(PSTATE_SS
);
239 static inline void gen_exception(int excp
, uint32_t syndrome
,
242 TCGv_i32 tcg_excp
= tcg_const_i32(excp
);
243 TCGv_i32 tcg_syn
= tcg_const_i32(syndrome
);
244 TCGv_i32 tcg_el
= tcg_const_i32(target_el
);
246 gen_helper_exception_with_syndrome(cpu_env
, tcg_excp
,
249 tcg_temp_free_i32(tcg_el
);
250 tcg_temp_free_i32(tcg_syn
);
251 tcg_temp_free_i32(tcg_excp
);
254 /* Generate an architectural singlestep exception */
255 static inline void gen_swstep_exception(DisasContext
*s
, int isv
, int ex
)
257 bool same_el
= (s
->debug_target_el
== s
->current_el
);
260 * If singlestep is targeting a lower EL than the current one,
261 * then s->ss_active must be false and we can never get here.
263 assert(s
->debug_target_el
>= s
->current_el
);
265 gen_exception(EXCP_UDEF
, syn_swstep(same_el
, isv
, ex
), s
->debug_target_el
);
269 * Given a VFP floating point constant encoded into an 8 bit immediate in an
270 * instruction, expand it to the actual constant value of the specified
271 * size, as per the VFPExpandImm() pseudocode in the Arm ARM.
273 uint64_t vfp_expand_imm(int size
, uint8_t imm8
);
275 /* Vector operations shared between ARM and AArch64. */
276 extern const GVecGen3 mla_op
[4];
277 extern const GVecGen3 mls_op
[4];
278 extern const GVecGen3 cmtst_op
[4];
279 extern const GVecGen2i ssra_op
[4];
280 extern const GVecGen2i usra_op
[4];
281 extern const GVecGen2i sri_op
[4];
282 extern const GVecGen2i sli_op
[4];
283 extern const GVecGen4 uqadd_op
[4];
284 extern const GVecGen4 sqadd_op
[4];
285 extern const GVecGen4 uqsub_op
[4];
286 extern const GVecGen4 sqsub_op
[4];
287 void gen_cmtst_i64(TCGv_i64 d
, TCGv_i64 a
, TCGv_i64 b
);
290 * Forward to the isar_feature_* tests given a DisasContext pointer.
292 #define dc_isar_feature(name, ctx) \
293 ({ DisasContext *ctx_ = (ctx); isar_feature_##name(ctx_->isar); })
295 #endif /* TARGET_ARM_TRANSLATE_H */