diff options
Diffstat (limited to 'gas/config/tc-arm.c')
| -rw-r--r-- | gas/config/tc-arm.c | 108 |
1 files changed, 89 insertions, 19 deletions
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index 7992360..d23181c 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -209,6 +209,8 @@ static const arm_feature_set arm_ext_adiv = ARM_FEATURE_CORE_LOW (ARM_EXT_ADIV); static const arm_feature_set arm_ext_virt = ARM_FEATURE_CORE_LOW (ARM_EXT_VIRT); static const arm_feature_set arm_ext_pan = ARM_FEATURE_CORE_HIGH (ARM_EXT2_PAN); static const arm_feature_set arm_ext_v8m = ARM_FEATURE_CORE_HIGH (ARM_EXT2_V8M); +static const arm_feature_set arm_ext_v6t2_v8m = + ARM_FEATURE_CORE_HIGH (ARM_EXT2_V6T2_V8M); /* Instructions shared between ARMv8-A and ARMv8-M. */ static const arm_feature_set arm_ext_atomics = ARM_FEATURE_CORE_HIGH (ARM_EXT2_ATOMICS); @@ -7873,7 +7875,8 @@ move_or_literal_pool (int i, enum lit_type t, bfd_boolean mode_3) return TRUE; } - if (ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2)) + if (ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2) + || ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2_v8m)) { /* Check if on thumb2 it can be done with a mov.w, mvn or movw instruction. */ @@ -7892,7 +7895,8 @@ move_or_literal_pool (int i, enum lit_type t, bfd_boolean mode_3) /* The number can be loaded with a mov.w or mvn instruction. */ - if (newimm != (unsigned int) FAIL) + if (newimm != (unsigned int) FAIL + && ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2)) { inst.instruction = (0xf04f0000 /* MOV.W. */ | (inst.operands[i].reg << 8)); @@ -7904,7 +7908,8 @@ move_or_literal_pool (int i, enum lit_type t, bfd_boolean mode_3) return TRUE; } /* The number can be loaded with a movw instruction. */ - else if ((v & ~0xFFFF) == 0) + else if ((v & ~0xFFFF) == 0 + && ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2_v8m)) { int imm = v & 0xFFFF; @@ -10939,6 +10944,10 @@ do_t_branch (void) reloc = BFD_RELOC_THUMB_PCREL_BRANCH25; else { + constraint (!ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2), + _("selected architecture does not support " + "wide conditional branch instruction")); + gas_assert (cond != 0xF); inst.instruction |= cond << 22; reloc = BFD_RELOC_THUMB_PCREL_BRANCH20; @@ -17809,11 +17818,12 @@ in_it_block (void) return now_it.state != OUTSIDE_IT_BLOCK; } -/* Whether OPCODE only has T32 encoding and makes build attribute - Tag_THUMB_ISA_use be set to 1 if assembled without any cpu or arch info. */ +/* Whether OPCODE only has T32 encoding. Since this function is only used by + t32_insn_ok, OPCODE enabled by v6t2 extension bit do not need to be listed + here, hence the "known" in the function name. */ static bfd_boolean -t1_isa_t32_only_insn (const struct asm_opcode *opcode) +known_t32_only_insn (const struct asm_opcode *opcode) { /* Original Thumb-1 wide instruction. */ if (opcode->tencode == do_t_blx @@ -17822,6 +17832,39 @@ t1_isa_t32_only_insn (const struct asm_opcode *opcode) || ARM_CPU_HAS_FEATURE (*opcode->tvariant, arm_ext_barrier)) return TRUE; + /* Wide-only instruction added to ARMv8-M. */ + if (ARM_CPU_HAS_FEATURE (*opcode->tvariant, arm_ext_v8m) + || ARM_CPU_HAS_FEATURE (*opcode->tvariant, arm_ext_atomics) + || ARM_CPU_HAS_FEATURE (*opcode->tvariant, arm_ext_v6t2_v8m) + || ARM_CPU_HAS_FEATURE (*opcode->tvariant, arm_ext_div)) + return TRUE; + + return FALSE; +} + +/* Whether wide instruction variant can be used if available for a valid OPCODE + in ARCH. */ + +static bfd_boolean +t32_insn_ok (arm_feature_set arch, const struct asm_opcode *opcode) +{ + if (known_t32_only_insn (opcode)) + return TRUE; + + /* Instruction with narrow and wide encoding added to ARMv8-M. Availability + of variant T3 of B.W is checked in do_t_branch. */ + if (ARM_CPU_HAS_FEATURE (arch, arm_ext_v8m) + && opcode->tencode == do_t_branch) + return TRUE; + + /* Wide instruction variants of all instructions with narrow *and* wide + variants become available with ARMv6t2. Other opcodes are either + narrow-only or wide-only and are thus available if OPCODE is valid. */ + if (ARM_CPU_HAS_FEATURE (arch, arm_ext_v6t2)) + return TRUE; + + /* OPCODE with narrow only instruction variant or wide variant not + available. */ return FALSE; } @@ -17893,14 +17936,18 @@ md_assemble (char *str) Only instructions with narrow and wide variants need to be handled but selecting all non wide-only instructions is easier. */ if (!ARM_CPU_HAS_FEATURE (variant, arm_ext_v6t2) - && !t1_isa_t32_only_insn (opcode)) + && !t32_insn_ok (variant, opcode)) { if (inst.size_req == 0) inst.size_req = 2; else if (inst.size_req == 4) { - as_bad (_("selected processor does not support `%s' in Thumb-2 " - "mode"), str); + if (ARM_CPU_HAS_FEATURE (variant, arm_ext_v8m)) + as_bad (_("selected processor does not support 32bit wide " + "variant of instruction `%s'"), str); + else + as_bad (_("selected processor does not support `%s' in " + "Thumb-2 mode"), str); return; } } @@ -17939,7 +17986,11 @@ md_assemble (char *str) set those bits when Thumb-2 32-bit instructions are seen. The impact of relaxable instructions will be considered later after we finish all relaxation. */ - if (inst.size == 4 && !t1_isa_t32_only_insn (opcode)) + if (ARM_FEATURE_CORE_EQUAL (cpu_variant, arm_arch_any)) + variant = arm_arch_none; + else + variant = cpu_variant; + if (inst.size == 4 && !t32_insn_ok (variant, opcode)) ARM_MERGE_FEATURE_SETS (thumb_arch_used, thumb_arch_used, arm_ext_v6t2); @@ -18906,11 +18957,14 @@ static const struct asm_opcode insns[] = TUF("setend", 1010000, b650, 1, (ENDI), setend, t_setend), #undef THUMB_VARIANT -#define THUMB_VARIANT & arm_ext_v6t2 +#define THUMB_VARIANT & arm_ext_v6t2_v8m TCE("ldrex", 1900f9f, e8500f00, 2, (RRnpc_npcsp, ADDR), ldrex, t_ldrex), TCE("strex", 1800f90, e8400000, 3, (RRnpc_npcsp, RRnpc_npcsp, ADDR), strex, t_strex), +#undef THUMB_VARIANT +#define THUMB_VARIANT & arm_ext_v6t2 + TUF("mcrr2", c400000, fc400000, 5, (RCP, I15b, RRnpc, RRnpc, RCN), co_reg2c, co_reg2c), TUF("mrrc2", c500000, fc500000, 5, (RCP, I15b, RRnpc, RRnpc, RCN), co_reg2c, co_reg2c), @@ -19056,7 +19110,7 @@ static const struct asm_opcode insns[] = RRnpcb), strexd, t_strexd), #undef THUMB_VARIANT -#define THUMB_VARIANT & arm_ext_v6t2 +#define THUMB_VARIANT & arm_ext_v6t2_v8m TCE("ldrexb", 1d00f9f, e8d00f4f, 2, (RRnpc_npcsp,RRnpcb), rd_rn, rd_rn), TCE("ldrexh", 1f00f9f, e8d00f5f, 2, (RRnpc_npcsp, RRnpcb), @@ -19100,8 +19154,6 @@ static const struct asm_opcode insns[] = TCE("ubfx", 7e00050, f3c00000, 4, (RR, RR, I31, I32), bfx, t_bfx), TCE("mls", 0600090, fb000010, 4, (RRnpc, RRnpc, RRnpc, RRnpc), mlas, t_mla), - TCE("movw", 3000000, f2400000, 2, (RRnpc, HALF), mov16, t_mov16), - TCE("movt", 3400000, f2c00000, 2, (RRnpc, HALF), mov16, t_mov16), TCE("rbit", 6ff0f30, fa90f0a0, 2, (RR, RR), rd_rm, t_rbit), TC3("ldrht", 03000b0, f8300e00, 2, (RRnpc_npcsp, ADDR), ldsttv4, t_ldstt), @@ -19109,6 +19161,11 @@ static const struct asm_opcode insns[] = TC3("ldrsbt", 03000d0, f9100e00, 2, (RRnpc_npcsp, ADDR), ldsttv4, t_ldstt), TC3("strht", 02000b0, f8200e00, 2, (RRnpc_npcsp, ADDR), ldsttv4, t_ldstt), +#undef THUMB_VARIANT +#define THUMB_VARIANT & arm_ext_v6t2_v8m + TCE("movw", 3000000, f2400000, 2, (RRnpc, HALF), mov16, t_mov16), + TCE("movt", 3400000, f2c00000, 2, (RRnpc, HALF), mov16, t_mov16), + /* Thumb-only instructions. */ #undef ARM_VARIANT #define ARM_VARIANT NULL @@ -19120,6 +19177,8 @@ static const struct asm_opcode insns[] = -mimplicit-it=[never | arm] modes. */ #undef ARM_VARIANT #define ARM_VARIANT & arm_ext_v1 +#undef THUMB_VARIANT +#define THUMB_VARIANT & arm_ext_v6t2 TUE("it", bf08, bf08, 1, (COND), it, t_it), TUE("itt", bf0c, bf0c, 1, (COND), it, t_it), @@ -24888,11 +24947,13 @@ static const struct arm_cpu_option_table arm_cpus[] = ARM_CPU_OPT ("ep9312", ARM_FEATURE_LOW (ARM_AEXT_V4T, ARM_CEXT_MAVERICK), FPU_ARCH_MAVERICK, "ARM920T"), /* Marvell processors. */ - ARM_CPU_OPT ("marvell-pj4", ARM_FEATURE_CORE_LOW (ARM_AEXT_V7A | ARM_EXT_MP - | ARM_EXT_SEC), + ARM_CPU_OPT ("marvell-pj4", ARM_FEATURE_CORE (ARM_AEXT_V7A | ARM_EXT_MP + | ARM_EXT_SEC, + ARM_EXT2_V6T2_V8M), FPU_ARCH_VFP_V3D16, NULL), - ARM_CPU_OPT ("marvell-whitney", ARM_FEATURE_CORE_LOW (ARM_AEXT_V7A | ARM_EXT_MP - | ARM_EXT_SEC), + ARM_CPU_OPT ("marvell-whitney", ARM_FEATURE_CORE (ARM_AEXT_V7A | ARM_EXT_MP + | ARM_EXT_SEC, + ARM_EXT2_V6T2_V8M), FPU_ARCH_NEON_VFP_V4, NULL), /* APM X-Gene family. */ ARM_CPU_OPT ("xgene1", ARM_ARCH_V8A, FPU_ARCH_CRYPTO_NEON_VFP_ARMV8, @@ -24962,6 +25023,7 @@ static const struct arm_arch_option_table arm_archs[] = ARM_ARCH_OPT ("armv7-r", ARM_ARCH_V7R, FPU_ARCH_VFP), ARM_ARCH_OPT ("armv7-m", ARM_ARCH_V7M, FPU_ARCH_VFP), ARM_ARCH_OPT ("armv7e-m", ARM_ARCH_V7EM, FPU_ARCH_VFP), + ARM_ARCH_OPT ("armv8-m.base", ARM_ARCH_V8M_BASE, FPU_ARCH_VFP), ARM_ARCH_OPT ("armv8-m.main", ARM_ARCH_V8M_MAIN, FPU_ARCH_VFP), ARM_ARCH_OPT ("armv8-a", ARM_ARCH_V8A, FPU_ARCH_VFP), ARM_ARCH_OPT ("armv8.1-a", ARM_ARCH_V8_1A, FPU_ARCH_VFP), @@ -25582,6 +25644,7 @@ static const cpu_arch_ver_table cpu_arch_ver[] = {10, ARM_ARCH_V7R}, {10, ARM_ARCH_V7M}, {14, ARM_ARCH_V8A}, + {16, ARM_ARCH_V8M_BASE}, {17, ARM_ARCH_V8M_MAIN}, {0, ARM_ARCH_NONE} }; @@ -25615,6 +25678,7 @@ aeabi_set_public_attributes (void) int fp16_optional = 0; arm_feature_set flags; arm_feature_set tmp; + arm_feature_set arm_arch_v8m_base = ARM_ARCH_V8M_BASE; const cpu_arch_ver_table *p; /* Choose the architecture based on the capabilities of the requested cpu @@ -25669,6 +25733,10 @@ aeabi_set_public_attributes (void) && ARM_CPU_HAS_FEATURE (flags, arm_ext_v6_dsp)) arch = TAG_CPU_ARCH_V7E_M; + ARM_CLEAR_FEATURE (tmp, flags, arm_arch_v8m_base); + if (arch == TAG_CPU_ARCH_V8M_BASE && ARM_CPU_HAS_FEATURE (tmp, arm_arch_any)) + arch = TAG_CPU_ARCH_V8M_MAIN; + /* In cpu_arch_ver ARMv8-A is before ARMv8-M for atomics to be detected as coming from ARMv8-A. However, since ARMv8-A has more instructions than ARMv8-M, -march=all must be detected as ARMv8-A. */ @@ -25799,7 +25867,9 @@ aeabi_set_public_attributes (void) by the base architecture. For new architectures we will have to check these tests. */ - gas_assert (arch <= TAG_CPU_ARCH_V8 || arch == TAG_CPU_ARCH_V8M_MAIN); + gas_assert (arch <= TAG_CPU_ARCH_V8 + || (arch >= TAG_CPU_ARCH_V8M_BASE + && arch <= TAG_CPU_ARCH_V8M_MAIN)); if (ARM_CPU_HAS_FEATURE (flags, arm_ext_v8) || ARM_CPU_HAS_FEATURE (flags, arm_ext_v8m)) aeabi_set_attribute_int (Tag_DIV_use, 0); |