/* aarch64-dis.c -- AArch64 disassembler.
- Copyright (C) 2009-2016 Free Software Foundation, Inc.
+ Copyright (C) 2009-2017 Free Software Foundation, Inc.
Contributed by ARM Ltd.
This file is part of the GNU opcodes library.
#include "sysdep.h"
#include "bfd_stdint.h"
-#include "dis-asm.h"
+#include "disassemble.h"
#include "libiberty.h"
#include "opintl.h"
#include "aarch64-dis.h"
is encoded in H:L:M in some cases, the fields H:L:M should be passed in
the order of H, L, M. */
-static inline aarch64_insn
+aarch64_insn
extract_fields (aarch64_insn code, aarch64_insn mask, ...)
{
uint32_t num;
default:
return 0;
}
+
+ if (inst->opcode->op == OP_FCMLA_ELEM)
+ {
+ /* Complex operand takes two elements. */
+ if (info->reglane.index & 1)
+ return 0;
+ info->reglane.index /= 2;
+ }
}
return 1;
info->reglist.first_regno = extract_field (FLD_Rt, code, 0);
/* opcode */
value = extract_field (FLD_opcode, code, 0);
+ /* PR 21595: Check for a bogus value. */
+ if (value >= ARRAY_SIZE (data))
+ return 0;
if (expected_num != data[value].num_elements || data[value].is_reserved)
return 0;
info->reglist.num_regs = data[value].num_regs;
return 1;
}
+/* Decode a 1-bit rotate immediate (#90 or #270). */
+int
+aarch64_ext_imm_rotate1 (const aarch64_operand *self, aarch64_opnd_info *info,
+ const aarch64_insn code,
+ const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+ uint64_t rot = extract_field (self->fields[0], code, 0);
+ assert (rot < 2U);
+ info->imm.value = rot * 180 + 90;
+ return 1;
+}
+
+/* Decode a 2-bit rotate immediate (#0, #90, #180 or #270). */
+int
+aarch64_ext_imm_rotate2 (const aarch64_operand *self, aarch64_opnd_info *info,
+ const aarch64_insn code,
+ const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+ uint64_t rot = extract_field (self->fields[0], code, 0);
+ assert (rot < 4U);
+ info->imm.value = rot * 90;
+ return 1;
+}
+
/* Decode scale for e.g. SCVTF <Dd>, <Wn>, #<fbits>. */
int
aarch64_ext_fbits (const aarch64_operand *self ATTRIBUTE_UNUSED,
switch (simd_size)
{
case 2: imm = (imm << 2) | imm;
+ /* Fall through. */
case 4: imm = (imm << 4) | imm;
+ /* Fall through. */
case 8: imm = (imm << 8) | imm;
+ /* Fall through. */
case 16: imm = (imm << 16) | imm;
+ /* Fall through. */
case 32: imm = (imm << 32) | imm;
+ /* Fall through. */
case 64: break;
default: assert (0); return 0;
}
return 1;
}
+/* Decode the address operand for e.g. LDRAA <Xt>, [<Xn|SP>{, #<simm>}]. */
+int
+aarch64_ext_addr_simm10 (const aarch64_operand *self, aarch64_opnd_info *info,
+ aarch64_insn code,
+ const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+ aarch64_insn imm;
+
+ info->qualifier = get_expected_qualifier (inst, info->idx);
+ /* Rn */
+ info->addr.base_regno = extract_field (self->fields[0], code, 0);
+ /* simm10 */
+ imm = extract_fields (code, 0, 2, self->fields[1], self->fields[2]);
+ info->addr.offset.imm = sign_extend (imm, 9) << 3;
+ if (extract_field (self->fields[3], code, 0) == 1) {
+ info->addr.writeback = 1;
+ info->addr.preind = 1;
+ }
+ return 1;
+}
+
/* Decode the address operand for e.g.
LD1 {<Vt>.<T>, <Vt2>.<T>, <Vt3>.<T>}, [<Xn|SP>], <Xm|#<amount>>. */
int
return 1;
}
+/* Decode an SVE address [X<n>, #<SVE_imm4> << <shift>], where <SVE_imm4>
+ is a 4-bit signed number and where <shift> is SELF's operand-dependent
+ value. fields[0] specifies the base register field. */
+int
+aarch64_ext_sve_addr_ri_s4 (const aarch64_operand *self,
+ aarch64_opnd_info *info, aarch64_insn code,
+ const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+ int offset = sign_extend (extract_field (FLD_SVE_imm4, code, 0), 3);
+ return aarch64_ext_sve_addr_reg_imm (self, info, code, offset);
+}
+
/* Decode an SVE address [X<n>, #<SVE_imm6> << <shift>], where <SVE_imm6>
is a 6-bit unsigned number and where <shift> is SELF's operand-dependent
value. fields[0] specifies the base register field. */
aarch64_opnd_info *info, aarch64_insn code,
const aarch64_inst *inst ATTRIBUTE_UNUSED)
{
- int index;
+ int index_regno;
- index = extract_field (self->fields[1], code, 0);
- if (index == 31 && (self->flags & OPD_F_NO_ZR) != 0)
+ index_regno = extract_field (self->fields[1], code, 0);
+ if (index_regno == 31 && (self->flags & OPD_F_NO_ZR) != 0)
return 0;
info->addr.base_regno = extract_field (self->fields[0], code, 0);
- info->addr.offset.regno = index;
+ info->addr.offset.regno = index_regno;
info->addr.offset.is_reg = TRUE;
info->addr.writeback = FALSE;
info->addr.preind = TRUE;
info->reglane.regno = extract_field (self->fields[0], code, 0);
val = extract_fields (code, 0, 2, FLD_SVE_tszh, FLD_imm5);
- if ((val & 15) == 0)
+ if ((val & 31) == 0)
return 0;
while ((val & 1) == 0)
val /= 2;
&& aarch64_sve_dupm_mov_immediate_p (info->imm.value, esize));
}
+/* Decode Zn[MM], where Zn occupies the least-significant part of the field
+ and where MM occupies the most-significant part. The operand-dependent
+ value specifies the number of bits in Zn. */
+int
+aarch64_ext_sve_quad_index (const aarch64_operand *self,
+ aarch64_opnd_info *info, aarch64_insn code,
+ const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+ unsigned int reg_bits = get_operand_specific_data (self);
+ unsigned int val = extract_all_fields (self, code);
+ info->reglane.regno = val & ((1 << reg_bits) - 1);
+ info->reglane.index = val >> reg_bits;
+ return 1;
+}
+
/* Decode {Zn.<T> - Zm.<T>}. The fields array specifies which field
to use for Zn. The opcode-dependent value specifies the number
of registers in the list. */
static int
do_misc_decoding (aarch64_inst *inst)
{
+ unsigned int value;
switch (inst->opcode->op)
{
case OP_FCVT:
return decode_fcvt (inst);
+
case OP_FCVTN:
case OP_FCVTN2:
case OP_FCVTL:
case OP_FCVTL2:
return decode_asimd_fcvt (inst);
+
case OP_FCVTXN_S:
return decode_asisd_fcvtxn (inst);
+
+ case OP_MOV_P_P:
+ case OP_MOVS_P_P:
+ value = extract_field (FLD_SVE_Pn, inst->value, 0);
+ return (value == extract_field (FLD_SVE_Pm, inst->value, 0)
+ && value == extract_field (FLD_SVE_Pg4_10, inst->value, 0));
+
+ case OP_MOV_Z_P_Z:
+ return (extract_field (FLD_SVE_Zd, inst->value, 0)
+ == extract_field (FLD_SVE_Zm_16, inst->value, 0));
+
+ case OP_MOV_Z_V:
+ /* Index must be zero. */
+ value = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_imm5);
+ return value > 0 && value <= 16 && value == (value & -value);
+
+ case OP_MOV_Z_Z:
+ return (extract_field (FLD_SVE_Zn, inst->value, 0)
+ == extract_field (FLD_SVE_Zm_16, inst->value, 0));
+
+ case OP_MOV_Z_Zi:
+ /* Index must be nonzero. */
+ value = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_imm5);
+ return value > 0 && value != (value & -value);
+
+ case OP_MOVM_P_P_P:
+ return (extract_field (FLD_SVE_Pd, inst->value, 0)
+ == extract_field (FLD_SVE_Pm, inst->value, 0));
+
+ case OP_MOVZS_P_P_P:
+ case OP_MOVZ_P_P_P:
+ return (extract_field (FLD_SVE_Pn, inst->value, 0)
+ == extract_field (FLD_SVE_Pm, inst->value, 0));
+
+ case OP_NOTS_P_P_P_Z:
+ case OP_NOT_P_P_P_Z:
+ return (extract_field (FLD_SVE_Pm, inst->value, 0)
+ == extract_field (FLD_SVE_Pg4_10, inst->value, 0));
+
default:
return 0;
}
int is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W;
value = ~value;
/* A MOVN has an immediate that could be encoded by MOVZ. */
- if (aarch64_wide_constant_p (value, is32, NULL) == TRUE)
+ if (aarch64_wide_constant_p (value, is32, NULL))
return 0;
}
inst->operands[1].imm.value = value;
/* ORR has an immediate that could be generated by a MOVZ or MOVN
instruction. */
if (inst->operands[0].reg.regno != 0x1f
- && (aarch64_wide_constant_p (value, is32, NULL) == TRUE
- || aarch64_wide_constant_p (~value, is32, NULL) == TRUE))
+ && (aarch64_wide_constant_p (value, is32, NULL)
+ || aarch64_wide_constant_p (~value, is32, NULL)))
return 0;
inst->operands[2].type = AARCH64_OPND_NIL;
opcode = inst->opcode;
/* This opcode does not have an alias, so use itself. */
- if (opcode_has_alias (opcode) == FALSE)
+ if (!opcode_has_alias (opcode))
return;
alias = aarch64_find_alias_opcode (opcode);
}
}
+/* Some instructions (including all SVE ones) use the instruction class
+ to describe how a qualifiers_list index is represented in the instruction
+ encoding. If INST is such an instruction, decode the appropriate fields
+ and fill in the operand qualifiers accordingly. Return true if no
+ problems are found. */
+
+static bfd_boolean
+aarch64_decode_variant_using_iclass (aarch64_inst *inst)
+{
+ int i, variant;
+
+ variant = 0;
+ switch (inst->opcode->iclass)
+ {
+ case sve_cpy:
+ variant = extract_fields (inst->value, 0, 2, FLD_size, FLD_SVE_M_14);
+ break;
+
+ case sve_index:
+ i = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_imm5);
+ if ((i & 31) == 0)
+ return FALSE;
+ while ((i & 1) == 0)
+ {
+ i >>= 1;
+ variant += 1;
+ }
+ break;
+
+ case sve_limm:
+ /* Pick the smallest applicable element size. */
+ if ((inst->value & 0x20600) == 0x600)
+ variant = 0;
+ else if ((inst->value & 0x20400) == 0x400)
+ variant = 1;
+ else if ((inst->value & 0x20000) == 0)
+ variant = 2;
+ else
+ variant = 3;
+ break;
+
+ case sve_misc:
+ /* sve_misc instructions have only a single variant. */
+ break;
+
+ case sve_movprfx:
+ variant = extract_fields (inst->value, 0, 2, FLD_size, FLD_SVE_M_16);
+ break;
+
+ case sve_pred_zm:
+ variant = extract_field (FLD_SVE_M_4, inst->value, 0);
+ break;
+
+ case sve_shift_pred:
+ i = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_SVE_tszl_8);
+ sve_shift:
+ if (i == 0)
+ return FALSE;
+ while (i != 1)
+ {
+ i >>= 1;
+ variant += 1;
+ }
+ break;
+
+ case sve_shift_unpred:
+ i = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_SVE_tszl_19);
+ goto sve_shift;
+
+ case sve_size_bhs:
+ variant = extract_field (FLD_size, inst->value, 0);
+ if (variant >= 3)
+ return FALSE;
+ break;
+
+ case sve_size_bhsd:
+ variant = extract_field (FLD_size, inst->value, 0);
+ break;
+
+ case sve_size_hsd:
+ i = extract_field (FLD_size, inst->value, 0);
+ if (i < 1)
+ return FALSE;
+ variant = i - 1;
+ break;
+
+ case sve_size_sd:
+ variant = extract_field (FLD_SVE_sz, inst->value, 0);
+ break;
+
+ default:
+ /* No mapping between instruction class and qualifiers. */
+ return TRUE;
+ }
+
+ for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i)
+ inst->operands[i].qualifier = inst->opcode->qualifiers_list[variant][i];
+ return TRUE;
+}
/* Decode the CODE according to OPCODE; fill INST. Return 0 if the decoding
fails, which meanes that CODE is not an instruction of OPCODE; otherwise
return 1.
goto decode_fail;
}
+ /* Possibly use the instruction class to determine the correct
+ qualifier. */
+ if (!aarch64_decode_variant_using_iclass (inst))
+ {
+ DEBUG_TRACE ("iclass-based decoder FAIL");
+ goto decode_fail;
+ }
+
/* Call operand decoders. */
for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i)
{
}
}
+/* Set NAME to a copy of INST's mnemonic with the "." suffix removed. */
+
+static void
+remove_dot_suffix (char *name, const aarch64_inst *inst)
+{
+ char *ptr;
+ size_t len;
+
+ ptr = strchr (inst->opcode->name, '.');
+ assert (ptr && inst->cond);
+ len = ptr - inst->opcode->name;
+ assert (len < 8);
+ strncpy (name, inst->opcode->name, len);
+ name[len] = '\0';
+}
+
/* Print the instruction mnemonic name. */
static void
/* For instructions that are truly conditionally executed, e.g. b.cond,
prepare the full mnemonic name with the corresponding condition
suffix. */
- char name[8], *ptr;
- size_t len;
-
- ptr = strchr (inst->opcode->name, '.');
- assert (ptr && inst->cond);
- len = ptr - inst->opcode->name;
- assert (len < 8);
- strncpy (name, inst->opcode->name, len);
- name [len] = '\0';
+ char name[8];
+
+ remove_dot_suffix (name, inst);
(*info->fprintf_func) (info->stream, "%s.%s", name, inst->cond->names[0]);
}
else
(*info->fprintf_func) (info->stream, "%s", inst->opcode->name);
}
+/* Decide whether we need to print a comment after the operands of
+ instruction INST. */
+
+static void
+print_comment (const aarch64_inst *inst, struct disassemble_info *info)
+{
+ if (inst->opcode->flags & F_COND)
+ {
+ char name[8];
+ unsigned int i, num_conds;
+
+ remove_dot_suffix (name, inst);
+ num_conds = ARRAY_SIZE (inst->cond->names);
+ for (i = 1; i < num_conds && inst->cond->names[i]; ++i)
+ (*info->fprintf_func) (info->stream, "%s %s.%s",
+ i == 1 ? " //" : ",",
+ name, inst->cond->names[i]);
+ }
+}
+
/* Print the instruction according to *INST. */
static void
{
print_mnemonic_name (inst, info);
print_operands (pc, inst->opcode, inst->operands, info);
+ print_comment (inst, info);
}
/* Entry-point of the instruction disassembler and printer. */
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