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[ARM] Don't warn on REG_SP when used in CRC32 instructions
According to ARMv8-A architecture manual, REG_SP is allowed in CRC32 instructions in Thumb mode. It is REG_PC that will cause unpredictable behaviours on both ARM and Thumb. This patch removes the incorrect warning on Thumb mode. Meanwhile the disassembler is updated to use format "<bitfield>R" instead of "<bitfield>S". "<bitfield>S" is not used elsewhere. so I have deleted related code from the disassembler. gas/ * config/tc-arm.c (do_crc32_1): Remove warning on REG_SP for thumb_mode. * testsuite/gas/arm/crc32-armv8-a-bad.d: Update exepcted result. * testsuite/gas/arm/crc32-armv8-r-bad.d: Likewise. * testsuite/gas/arm/crc32-armv8-a.d: Likewise. * testsuite/gas/arm/crc32-armv8-r.d: Likewise. * testsuite/gas/arm/crc32-armv8-ar-bad.s: Update test case. * testsuite/gas/arm/crc32-armv8-ar.s: Likewise. * testsuite/gas/arm/crc32-bad.l: Update expected error message. opcode/ * arm-dis.c (thumb32_opcodes): Use format 'R' instead of 'S' for register operands in CRC instructions. (print_insn_thumb32): Remove "<bitfield>S" support. Updated the comments.
This commit is contained in:
Jiong Wang
parent
cd3af38d7b
commit
cc4a945a26
@ -1,3 +1,14 @@
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2017-08-09 Jiong Wang <jiong.wang@arm.com>
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* config/tc-arm.c (do_crc32_1): Remove warning on REG_SP for thumb_mode.
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* testsuite/gas/arm/crc32-armv8-a-bad.d: Update exepcted result.
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* testsuite/gas/arm/crc32-armv8-r-bad.d: Likewise.
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* testsuite/gas/arm/crc32-armv8-a.d: Likewise.
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* testsuite/gas/arm/crc32-armv8-r.d: Likewise.
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* testsuite/gas/arm/crc32-armv8-ar-bad.s: Update test case.
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* testsuite/gas/arm/crc32-armv8-ar.s: Likewise.
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* testsuite/gas/arm/crc32-bad.l: Update expected error message.
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2017-08-02 Nick Clifton <nickc@redhat.com>
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* testsuite/gas/all/gas.exp: Add am33 to the skip lists of tests
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@ -17598,8 +17598,6 @@ do_crc32_1 (unsigned int poly, unsigned int sz)
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if (Rd == REG_PC || Rn == REG_PC || Rm == REG_PC)
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as_warn (UNPRED_REG ("r15"));
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if (thumb_mode && (Rd == REG_SP || Rn == REG_SP || Rm == REG_SP))
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as_warn (UNPRED_REG ("r13"));
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}
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static void
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@ -15,9 +15,9 @@ Disassembly of section .text:
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0+c <[^>]*> e10f0242 crc32cb r0, pc, r2 ; <UNPREDICTABLE>
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0+10 <[^>]*> e121f242 crc32ch pc, r1, r2 ; <UNPREDICTABLE>
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0+14 <[^>]*> e14f0242 crc32cw r0, pc, r2 ; <UNPREDICTABLE>
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0+18 <[^>]*> fac1 fd82 crc32b sp, r1, r2 ; <UNPREDICTABLE>
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0+18 <[^>]*> fac1 ff82 crc32b pc, r1, r2 ; <UNPREDICTABLE>
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0+1c <[^>]*> facf f092 crc32h r0, pc, r2 ; <UNPREDICTABLE>
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0+20 <[^>]*> fac1 f0ad crc32w r0, r1, sp ; <UNPREDICTABLE>
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0+20 <[^>]*> fac1 f0af crc32w r0, r1, pc ; <UNPREDICTABLE>
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0+24 <[^>]*> fadf f082 crc32cb r0, pc, r2 ; <UNPREDICTABLE>
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0+28 <[^>]*> fad1 fd92 crc32ch sp, r1, r2 ; <UNPREDICTABLE>
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0+28 <[^>]*> fad1 ff92 crc32ch pc, r1, r2 ; <UNPREDICTABLE>
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0+2c <[^>]*> fadf f0a2 crc32cw r0, pc, r2 ; <UNPREDICTABLE>
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@ -20,4 +20,15 @@ Disassembly of section .text:
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0+24 <[^>]*> fad1 f082 crc32cb r0, r1, r2
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0+28 <[^>]*> fad1 f092 crc32ch r0, r1, r2
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0+2c <[^>]*> fad1 f0a2 crc32cw r0, r1, r2
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0+30 <[^>]*> e101d042 crc32b sp, r1, r2
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0+34 <[^>]*> e12db042 crc32h fp, sp, r2
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0+38 <[^>]*> e141004d crc32w r0, r1, sp
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0+3c <[^>]*> e10d9242 crc32cb r9, sp, r2
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0+40 <[^>]*> e121d248 crc32ch sp, r1, r8
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0+44 <[^>]*> e141a24d crc32cw sl, r1, sp
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0+48 <[^>]*> fac1 fc8d crc32b ip, r1, sp
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0+4c <[^>]*> facd fa92 crc32h r5, sp, r2
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0+50 <[^>]*> fac1 fda7 crc32w sp, r1, r7
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0+54 <[^>]*> fadd f082 crc32cb r0, sp, r2
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0+58 <[^>]*> fad5 f09d crc32ch r0, r5, sp
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0+5c <[^>]*> fad1 fda9 crc32cw sp, r1, r9
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@ -9,9 +9,9 @@ crc32ch r15, r1, r2
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crc32cw r0, r15, r2
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.thumb
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crc32b r13, r1, r2
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crc32b r15, r1, r2
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crc32h r0, r15, r2
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crc32w r0, r1, r13
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crc32w r0, r1, r15
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crc32cb r0, r15, r2
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crc32ch r13, r1, r2
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crc32ch r15, r1, r2
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crc32cw r0, r15, r2
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@ -15,3 +15,19 @@ crc32w r0, r1, r2
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crc32cb r0, r1, r2
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crc32ch r0, r1, r2
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crc32cw r0, r1, r2
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.arm
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crc32b sp, r1, r2
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crc32h r11, sp, r2
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crc32w r0, r1, sp
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crc32cb r9, sp, r2
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crc32ch sp, r1, r8
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crc32cw r10, r1, sp
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.thumb
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crc32b r12, r1, sp
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crc32h r10, sp, r2
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crc32w sp, r1, r7
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crc32cb r0, sp, r2
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crc32ch r0, r5, sp
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crc32cw sp, r1, r9
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@ -15,9 +15,9 @@ Disassembly of section .text:
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0+c <[^>]*> e10f0242 crc32cb r0, pc, r2 ; <UNPREDICTABLE>
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0+10 <[^>]*> e121f242 crc32ch pc, r1, r2 ; <UNPREDICTABLE>
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0+14 <[^>]*> e14f0242 crc32cw r0, pc, r2 ; <UNPREDICTABLE>
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0+18 <[^>]*> fac1 fd82 crc32b sp, r1, r2 ; <UNPREDICTABLE>
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0+18 <[^>]*> fac1 ff82 crc32b pc, r1, r2 ; <UNPREDICTABLE>
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0+1c <[^>]*> facf f092 crc32h r0, pc, r2 ; <UNPREDICTABLE>
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0+20 <[^>]*> fac1 f0ad crc32w r0, r1, sp ; <UNPREDICTABLE>
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0+20 <[^>]*> fac1 f0af crc32w r0, r1, pc ; <UNPREDICTABLE>
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0+24 <[^>]*> fadf f082 crc32cb r0, pc, r2 ; <UNPREDICTABLE>
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0+28 <[^>]*> fad1 fd92 crc32ch sp, r1, r2 ; <UNPREDICTABLE>
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0+28 <[^>]*> fad1 ff92 crc32ch pc, r1, r2 ; <UNPREDICTABLE>
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0+2c <[^>]*> fadf f0a2 crc32cw r0, pc, r2 ; <UNPREDICTABLE>
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@ -20,4 +20,15 @@ Disassembly of section .text:
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0+24 <[^>]*> fad1 f082 crc32cb r0, r1, r2
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0+28 <[^>]*> fad1 f092 crc32ch r0, r1, r2
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0+2c <[^>]*> fad1 f0a2 crc32cw r0, r1, r2
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0+30 <[^>]*> e101d042 crc32b sp, r1, r2
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0+34 <[^>]*> e12db042 crc32h fp, sp, r2
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0+38 <[^>]*> e141004d crc32w r0, r1, sp
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0+3c <[^>]*> e10d9242 crc32cb r9, sp, r2
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0+40 <[^>]*> e121d248 crc32ch sp, r1, r8
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0+44 <[^>]*> e141a24d crc32cw sl, r1, sp
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0+48 <[^>]*> fac1 fc8d crc32b ip, r1, sp
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0+4c <[^>]*> facd fa92 crc32h r5, sp, r2
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0+50 <[^>]*> fac1 fda7 crc32w sp, r1, r7
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0+54 <[^>]*> fadd f082 crc32cb r0, sp, r2
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0+58 <[^>]*> fad5 f09d crc32ch r0, r5, sp
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0+5c <[^>]*> fad1 fda9 crc32cw sp, r1, r9
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@ -5,9 +5,9 @@
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[^:]*.s:7: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:8: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:9: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:12: Warning: using r13 results in unpredictable behaviour
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[^:]*.s:12: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:13: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:14: Warning: using r13 results in unpredictable behaviour
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[^:]*.s:14: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:15: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:16: Warning: using r13 results in unpredictable behaviour
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[^:]*.s:16: Warning: using r15 results in unpredictable behaviour
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[^:]*.s:17: Warning: using r15 results in unpredictable behaviour
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@ -1,3 +1,10 @@
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2017-08-09 Jiong Wang <jiong.wang@arm.com>
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* arm-dis.c (thumb32_opcodes): Use format 'R' instead of 'S' for
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register operands in CRC instructions.
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(print_insn_thumb32): Remove "<bitfield>S" support. Updated the
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comments.
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2017-08-07 H.J. Lu <hongjiu.lu@intel.com>
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* disassemble.c (disassembler): Mark big and mach with
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@ -2699,7 +2699,6 @@ static const struct opcode16 thumb_opcodes[] =
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%<bitfield>W print bitfield*4 in decimal
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%<bitfield>r print bitfield as an ARM register
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%<bitfield>R as %<>r but r15 is UNPREDICTABLE
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%<bitfield>S as %<>R but r13 is UNPREDICTABLE
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%<bitfield>c print bitfield as a condition code
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%<bitfield>'c print specified char iff bitfield is all ones
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@ -2767,17 +2766,17 @@ static const struct opcode32 thumb32_opcodes[] =
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/* CRC32 instructions. */
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfac0f080, 0xfff0f0f0, "crc32b\t%8-11S, %16-19S, %0-3S"},
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0xfac0f080, 0xfff0f0f0, "crc32b\t%8-11R, %16-19R, %0-3R"},
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfac0f090, 0xfff0f0f0, "crc32h\t%9-11S, %16-19S, %0-3S"},
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0xfac0f090, 0xfff0f0f0, "crc32h\t%9-11R, %16-19R, %0-3R"},
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfac0f0a0, 0xfff0f0f0, "crc32w\t%8-11S, %16-19S, %0-3S"},
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0xfac0f0a0, 0xfff0f0f0, "crc32w\t%8-11R, %16-19R, %0-3R"},
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfad0f080, 0xfff0f0f0, "crc32cb\t%8-11S, %16-19S, %0-3S"},
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0xfad0f080, 0xfff0f0f0, "crc32cb\t%8-11R, %16-19R, %0-3R"},
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfad0f090, 0xfff0f0f0, "crc32ch\t%8-11S, %16-19S, %0-3S"},
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0xfad0f090, 0xfff0f0f0, "crc32ch\t%8-11R, %16-19R, %0-3R"},
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{ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
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0xfad0f0a0, 0xfff0f0f0, "crc32cw\t%8-11S, %16-19S, %0-3S"},
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0xfad0f0a0, 0xfff0f0f0, "crc32cw\t%8-11R, %16-19R, %0-3R"},
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/* V7 instructions. */
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{ARM_FEATURE_CORE_LOW (ARM_EXT_V7), 0xf910f000, 0xff70f000, "pli%c\t%a"},
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@ -5987,10 +5986,6 @@ print_insn_thumb32 (bfd_vma pc, struct disassemble_info *info, long given)
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value_in_comment = val * 4;
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break;
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case 'S':
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if (val == 13)
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is_unpredictable = TRUE;
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/* Fall through. */
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case 'R':
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if (val == 15)
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is_unpredictable = TRUE;
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