From bada43421274615d0d5f629a61a60b7daa71bc15 Mon Sep 17 00:00:00 2001 From: Jiong Wang Date: Thu, 3 Nov 2016 12:00:53 +0000 Subject: [PATCH] [ARM] Allow MOV/MOV.W to accept all possible immediates gas/ * config/tc-arm.c (SBIT_SHIFT): New. (T2_SBIT_SHIFT): Likewise. (t32_insn_ok): Return TRUE for MOV in ARMv8-M Baseline. (md_apply_fix): Try UINT16 encoding when ARM/Thumb modified immediate encoding failed. * testsuite/gas/arm/archv6t2-bad.s: New error case. * testsuite/gas/arm/archv6t2-bad.l: New error match. * testsuite/gas/arm/archv6t2.s: New testcase. * testsuite/gas/arm/archv6t2.d: New expected result. * testsuite/gas/arm/archv8m.s: New testcase. * testsuite/gas/arm/archv8m-base.d: New expected result. * testsuite/gas/arm/archv8m-main.d: Likewise. * testsuite/gas/arm/archv8m-main-dsp-1.d: Likewise. --- gas/ChangeLog | 16 ++++ gas/config/tc-arm.c | 85 ++++++++++++++++++---- gas/testsuite/gas/arm/archv6t2-bad.l | 1 + gas/testsuite/gas/arm/archv6t2-bad.s | 5 +- gas/testsuite/gas/arm/archv6t2.d | 1 + gas/testsuite/gas/arm/archv6t2.s | 3 + gas/testsuite/gas/arm/archv8m-base.d | 2 + gas/testsuite/gas/arm/archv8m-main-dsp-1.d | 2 + gas/testsuite/gas/arm/archv8m-main.d | 2 + gas/testsuite/gas/arm/archv8m.s | 8 ++ 10 files changed, 108 insertions(+), 17 deletions(-) diff --git a/gas/ChangeLog b/gas/ChangeLog index 98aa7499558..0030ab3f80c 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,19 @@ +2016-11-02 Jiong Wang + + * config/tc-arm.c (SBIT_SHIFT): New. + (T2_SBIT_SHIFT): Likewise. + (t32_insn_ok): Return TRUE for MOV in ARMv8-M Baseline. + (md_apply_fix): Try UINT16 encoding when ARM/Thumb modified immediate + encoding failed. + * testsuite/gas/arm/archv6t2-bad.s: New error case. + * testsuite/gas/arm/archv6t2-bad.l: New error match. + * testsuite/gas/arm/archv6t2.s: New testcase. + * testsuite/gas/arm/archv6t2.d: New expected result. + * testsuite/gas/arm/archv8m.s: New testcase. + * testsuite/gas/arm/archv8m-base.d: New expected result. + * testsuite/gas/arm/archv8m-main.d: Likewise. + * testsuite/gas/arm/archv8m-main-dsp-1.d: Likewise. + 2016-11-02 Igor Tsimbalist * config/tc-i386.c: (cpu_arch) Add .avx512_4vnniw. diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index 73f8396396f..f28bf5297f3 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -685,9 +685,11 @@ struct asm_opcode #define T2_SUBS_PC_LR 0xf3de8f00 #define DATA_OP_SHIFT 21 +#define SBIT_SHIFT 20 #define T2_OPCODE_MASK 0xfe1fffff #define T2_DATA_OP_SHIFT 21 +#define T2_SBIT_SHIFT 20 #define A_COND_MASK 0xf0000000 #define A_PUSH_POP_OP_MASK 0x0fff0000 @@ -18270,6 +18272,13 @@ t32_insn_ok (arm_feature_set arch, const struct asm_opcode *opcode) && opcode->tencode == do_t_branch) return TRUE; + /* MOV accepts T1/T3 encodings under Baseline, T3 encoding is 32bit. */ + if (ARM_CPU_HAS_FEATURE (arch, arm_ext_v8m) + && opcode->tencode == do_t_mov_cmp + /* Make sure CMP instruction is not affected. */ + && opcode->aencode == do_mov) + 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. */ @@ -22773,6 +22782,23 @@ md_apply_fix (fixS * fixP, changing the opcode. */ if (newimm == (unsigned int) FAIL) newimm = negate_data_op (&temp, value); + /* MOV accepts both ARM modified immediate (A1 encoding) and + UINT16 (A2 encoding) when possible, MOVW only accepts UINT16. + When disassembling, MOV is preferred when there is no encoding + overlap. */ + if (newimm == (unsigned int) FAIL + && ((temp >> DATA_OP_SHIFT) & 0xf) == OPCODE_MOV + && ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2) + && !((temp >> SBIT_SHIFT) & 0x1) + && value >= 0 && value <= 0xffff) + { + /* Clear bits[23:20] to change encoding from A1 to A2. */ + temp &= 0xff0fffff; + /* Encoding high 4bits imm. Code below will encode the remaining + low 12bits. */ + temp |= (value & 0x0000f000) << 4; + newimm = value & 0x00000fff; + } } if (newimm == (unsigned int) FAIL) @@ -23089,32 +23115,59 @@ md_apply_fix (fixS * fixP, newval |= md_chars_to_number (buf+2, THUMB_SIZE); newimm = FAIL; - if (fixP->fx_r_type == BFD_RELOC_ARM_T32_IMMEDIATE + if ((fixP->fx_r_type == BFD_RELOC_ARM_T32_IMMEDIATE + /* ARMv8-M Baseline MOV will reach here, but it doesn't support + Thumb2 modified immediate encoding (T2). */ + && ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2)) || fixP->fx_r_type == BFD_RELOC_ARM_T32_ADD_IMM) { newimm = encode_thumb32_immediate (value); if (newimm == (unsigned int) FAIL) newimm = thumb32_negate_data_op (&newval, value); } - if (fixP->fx_r_type != BFD_RELOC_ARM_T32_IMMEDIATE - && newimm == (unsigned int) FAIL) + if (newimm == (unsigned int) FAIL) { - /* Turn add/sum into addw/subw. */ - if (fixP->fx_r_type == BFD_RELOC_ARM_T32_ADD_IMM) - newval = (newval & 0xfeffffff) | 0x02000000; - /* No flat 12-bit imm encoding for addsw/subsw. */ - if ((newval & 0x00100000) == 0) + if (fixP->fx_r_type != BFD_RELOC_ARM_T32_IMMEDIATE) { - /* 12 bit immediate for addw/subw. */ - if (value < 0) + /* Turn add/sum into addw/subw. */ + if (fixP->fx_r_type == BFD_RELOC_ARM_T32_ADD_IMM) + newval = (newval & 0xfeffffff) | 0x02000000; + /* No flat 12-bit imm encoding for addsw/subsw. */ + if ((newval & 0x00100000) == 0) { - value = -value; - newval ^= 0x00a00000; + /* 12 bit immediate for addw/subw. */ + if (value < 0) + { + value = -value; + newval ^= 0x00a00000; + } + if (value > 0xfff) + newimm = (unsigned int) FAIL; + else + newimm = value; + } + } + else + { + /* MOV accepts both Thumb2 modified immediate (T2 encoding) and + UINT16 (T3 encoding), MOVW only accepts UINT16. When + disassembling, MOV is preferred when there is no encoding + overlap. + NOTE: MOV is using ORR opcode under Thumb 2 mode. */ + if (((newval >> T2_DATA_OP_SHIFT) & 0xf) == T2_OPCODE_ORR + && ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6t2_v8m) + && !((newval >> T2_SBIT_SHIFT) & 0x1) + && value >= 0 && value <=0xffff) + { + /* Toggle bit[25] to change encoding from T2 to T3. */ + newval ^= 1 << 25; + /* Clear bits[19:16]. */ + newval &= 0xfff0ffff; + /* Encoding high 4bits imm. Code below will encode the + remaining low 12bits. */ + newval |= (value & 0x0000f000) << 4; + newimm = value & 0x00000fff; } - if (value > 0xfff) - newimm = (unsigned int) FAIL; - else - newimm = value; } } diff --git a/gas/testsuite/gas/arm/archv6t2-bad.l b/gas/testsuite/gas/arm/archv6t2-bad.l index 0f00db37b2b..89c28ecd231 100644 --- a/gas/testsuite/gas/arm/archv6t2-bad.l +++ b/gas/testsuite/gas/arm/archv6t2-bad.l @@ -38,3 +38,4 @@ [^:]*:53: Warning: source register same as write-back base [^:]*:59: Error: instruction does not accept this addressing mode -- `ldrex r0,r2' [^:]*:60: Error: instruction does not accept this addressing mode -- `strex r1,r0,r2' +[^:]*:64: Error: invalid constant \(999\) after fixup diff --git a/gas/testsuite/gas/arm/archv6t2-bad.s b/gas/testsuite/gas/arm/archv6t2-bad.s index af1397271b6..008088d923b 100644 --- a/gas/testsuite/gas/arm/archv6t2-bad.s +++ b/gas/testsuite/gas/arm/archv6t2-bad.s @@ -58,4 +58,7 @@ x: @ to a label called "r2". ldrex r0, r2 strex r1, r0, r2 - \ No newline at end of file + + @ movs shouldn't be extened to accept UINT16 can't fit into ARM modified + @ immediate format. + movs r0, #0x0999 diff --git a/gas/testsuite/gas/arm/archv6t2.d b/gas/testsuite/gas/arm/archv6t2.d index eb76a321a8e..8769b3f3a18 100644 --- a/gas/testsuite/gas/arm/archv6t2.d +++ b/gas/testsuite/gas/arm/archv6t2.d @@ -61,3 +61,4 @@ Disassembly of section .text: 0+d4 <[^>]+> e06100b2 strht r0, \[r1\], #-2 0+d8 <[^>]+> 10e100b2 strhtne r0, \[r1\], #2 0+dc <[^>]+> 106100b2 strhtne r0, \[r1\], #-2 +0+e0 <[^>]+> e3009999 movw r9, #2457 ; 0x999 diff --git a/gas/testsuite/gas/arm/archv6t2.s b/gas/testsuite/gas/arm/archv6t2.s index 81ff5012f5d..8d74359ad7b 100644 --- a/gas/testsuite/gas/arm/archv6t2.s +++ b/gas/testsuite/gas/arm/archv6t2.s @@ -65,3 +65,6 @@ x: strht r0, [r1], #-2 strneht r0, [r1], #2 strneht r0, [r1], #-2 + + @ mov accept A2 encoding as well. + mov r9, #0x0999 diff --git a/gas/testsuite/gas/arm/archv8m-base.d b/gas/testsuite/gas/arm/archv8m-base.d index 6a2ee87f3b6..6075ee048a0 100644 --- a/gas/testsuite/gas/arm/archv8m-base.d +++ b/gas/testsuite/gas/arm/archv8m-base.d @@ -16,6 +16,8 @@ Disassembly of section .text: 0+.* <[^>]*> e849 f840 ttt r8, r9 0+.* <[^>]*> f24f 1023 movw r0, #61731 ; 0xf123 0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1023 movt r0, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1823 movt r8, #61731 ; 0xf123 0+.* <[^>]*> b154 cbz r4, 0+.* <[^>]*> diff --git a/gas/testsuite/gas/arm/archv8m-main-dsp-1.d b/gas/testsuite/gas/arm/archv8m-main-dsp-1.d index c8f9d7b81bf..8c2c12d0d1c 100644 --- a/gas/testsuite/gas/arm/archv8m-main-dsp-1.d +++ b/gas/testsuite/gas/arm/archv8m-main-dsp-1.d @@ -16,6 +16,8 @@ Disassembly of section .text: 0+.* <[^>]*> e849 f840 ttt r8, r9 0+.* <[^>]*> f24f 1023 movw r0, #61731 ; 0xf123 0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1023 movt r0, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1823 movt r8, #61731 ; 0xf123 0+.* <[^>]*> b154 cbz r4, 0+.* <[^>]*> diff --git a/gas/testsuite/gas/arm/archv8m-main.d b/gas/testsuite/gas/arm/archv8m-main.d index a0c40e99c89..0b76db10fbd 100644 --- a/gas/testsuite/gas/arm/archv8m-main.d +++ b/gas/testsuite/gas/arm/archv8m-main.d @@ -16,6 +16,8 @@ Disassembly of section .text: 0+.* <[^>]*> e849 f840 ttt r8, r9 0+.* <[^>]*> f24f 1023 movw r0, #61731 ; 0xf123 0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 +0+.* <[^>]*> f24f 1823 movw r8, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1023 movt r0, #61731 ; 0xf123 0+.* <[^>]*> f2cf 1823 movt r8, #61731 ; 0xf123 0+.* <[^>]*> b154 cbz r4, 0+.* <[^>]*> diff --git a/gas/testsuite/gas/arm/archv8m.s b/gas/testsuite/gas/arm/archv8m.s index 5f8aafed487..a82582eb889 100644 --- a/gas/testsuite/gas/arm/archv8m.s +++ b/gas/testsuite/gas/arm/archv8m.s @@ -11,6 +11,14 @@ tt r8, r9 ttt r0, r1 ttt r8, r9 movw r0, #0xF123 +@ mov accept all immediate formats, including T3. It's also the suggested +@ assembly to use. +mov r8, #0xF123 +@ .w means wide, specifies that the assembler must select a 32-bit encoding for +@ the instruction if it is possible, it should accept both T2 (Thumb modified +@ immediate) and T3 (UINT16) encoding. See the section "Standard assembler +@ syntax fields" on latest ARM-ARM. +mov.w r8, #0xF123 movw r8, #0xF123 movt r0, #0xF123 movt r8, #0xF123 -- 2.30.2