xref: /aosp_15_r20/external/llvm/test/MC/Disassembler/ARM/invalid-thumbv7.txt (revision 9880d6810fe72a1726cb53787c6711e909410d58)

# RUN: not llvm-mc -disassemble %s -mcpu cortex-a8 -triple thumbv7 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V7
# RUN: not llvm-mc -disassemble %s -mcpu cortex-a53 -triple thumbv8 2>&1 | FileCheck %s

# This file is checking Thumbv7 encodings which are globally invalid, usually due
# to the constraints of the instructions not being met. For example invalid
# combinations of registers.

#------------------------------------------------------------------------------
# Undefined encoding for b.cc
#------------------------------------------------------------------------------

# Opcode=1894 Name=t2Bcc Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 0: 1: 1: 1| 1: 0: 1: 0| 1: 1: 1: 1| 1: 0: 0: 0| 1: 0: 1: 1| 0: 1: 0: 0| 0: 1: 0: 0|
# -------------------------------------------------------------------------------------------------
#
# A8.6.16 B
# if cond<3:1> == '111' then SEE "Related Encodings"

[0xaf 0xf7 0x44 0x8b]
# CHECK: warning: invalid instruction encoding
# CHECK-NEXT: [0xaf 0xf7 0x44 0x8b]

#------------------------------------------------------------------------------
# Undefined encoding for it
#------------------------------------------------------------------------------

[0xff 0xbf 0x6b 0x80 0x00 0x75]
# CHECK: potentially undefined instruction encoding
# CHECK-NEXT: [0xff 0xbf 0x6b 0x80 0x00 0x75]

[0x50 0xbf] # hint #5; legal as the third instruction for the iteee above

# Two warnings from this block since there are two instructions in there
[0xdb 0xbf 0x42 0xbb]
# CHECK: potentially undefined instruction encoding
# CHECK-NEXT: [0xdb 0xbf 0x42 0xbb]
# CHECK: potentially undefined instruction encoding
# CHECK-NEXT: [0xdb 0xbf 0x42 0xbb]

#------------------------------------------------------------------------------
# Undefined encoding for ldm
#------------------------------------------------------------------------------

# Writeback is not allowed is Rn is in the target register list.
[0xb4 0xe8 0x34 0x04]
# CHECK: potentially undefined instruction encoding
# CHECK-NEXT: [0xb4 0xe8 0x34 0x04]


#------------------------------------------------------------------------------
# Undefined encoding for ldrd
#------------------------------------------------------------------------------

# Opcode=1930 Name=t2LDRD_PRE Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 0| 1: 0: 0: 1| 1: 1: 1: 1| 1: 1: 1: 1| 1: 1: 1: 0| 1: 0: 1: 1| 0: 0: 0: 0| 0: 0: 0: 0|
# -------------------------------------------------------------------------------------------------
#
# A8.6.66 LDRD (immediate)
# if Rn = '1111' then SEE LDRD (literal)
# A8.6.67 LDRD (literal)
# Inst{21} = 0

[0xff 0xe9 0x0 0xeb]
# CHECK: potentially undefined
# CHECK-NEXT: [0xff 0xe9 0x0 0xeb]


#------------------------------------------------------------------------------
# Undefined encodings for ldrbt
#------------------------------------------------------------------------------

# Opcode=1922 Name=t2LDRBT Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 1: 0: 0: 0| 0: 0: 0: 1| 0: 0: 0: 0| 1: 1: 1: 1| 1: 1: 1: 0| 0: 0: 0: 0| 0: 0: 1: 1|
# -------------------------------------------------------------------------------------------------
#
# The unpriviledged Load/Store cannot have SP or PC as Rt.
[0x10 0xf8 0x3 0xfe]
# CHECK: potentially undefined instruction encoding
# CHECK-NEXT: [0x10 0xf8 0x3 0xfe]


#------------------------------------------------------------------------------
# Undefined encodings for ldrsh
#------------------------------------------------------------------------------

# invalid LDRSHs Rt=PC
[0x30 0xf9 0x00 0xf0]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x30 0xf9 0x00 0xf0]

# invalid LDRSHi8 Rt=PC
[0x30 0xf9 0x00 0xfc]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x30 0xf9 0x00 0xfc]

# invalid LDRSHi12 Rt=PC
[0xb0 0xf9 0x00 0xf0]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xb0 0xf9 0x00 0xf0]

# Opcode=1954 Name=t2LDRSHi8 Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 1: 0: 0: 1| 0: 0: 1: 1| 0: 1: 0: 1| 1: 1: 1: 1| 1: 1: 0: 0| 0: 0: 0: 0| 0: 0: 0: 0|
# -------------------------------------------------------------------------------------------------
#
# if Rt == '1111' and PUW == '100' then SEE "Unallocated memory hints"
[0x35 0xf9 0x00 0xfc]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x35 0xf9 0x00 0xfc]

# Opcode=1953 Name=t2LDRSHi12 Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 1: 0: 0: 1| 1: 0: 1: 1| 0: 0: 1: 1| 1: 1: 1: 1| 1: 0: 0: 0| 1: 1: 0: 1| 1: 1: 1: 1|
# -------------------------------------------------------------------------------------------------
#
# if Rt = '1111' then SEE "Unallocated memory hints"
[0xb3 0xf9 0xdf 0xf8]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xb3 0xf9 0xdf 0xf8]


#------------------------------------------------------------------------------
# Undefined encoding for push
#------------------------------------------------------------------------------

# SP and PC are not allowed in the register list on STM instructions in Thumb2.
[0x2d 0xe9 0xf7 0xb6]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x2d 0xe9 0xf7 0xb6]


#------------------------------------------------------------------------------
# Undefined encoding for stmia
#------------------------------------------------------------------------------

# Opcode=2313 Name=tSTMIA_UPD Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 0: 0: 0: 0| 0: 0: 0: 0| 0: 0: 0: 0| 0: 0: 0: 0| 1: 1: 0: 0| 0: 1: 1: 1| 0: 0: 0: 0| 0: 0: 0: 0|
# -------------------------------------------------------------------------------------------------
#
# if BitCount(registers) < 1 then UNPREDICTABLE
[0x00 0xc7]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x00 0xc7]


#------------------------------------------------------------------------------
# Undefined encodings for str
#------------------------------------------------------------------------------

# invalid STRi12   Rn=PC
[0xcf 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xcf 0xf8 0x00 0x00]

# invalid STRi8    Rn=PC
[0x4f 0xf8 0x00 0x0c]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x4f 0xf8 0x00 0x0c]

# invalid STRs     Rn=PC
[0x4f 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x4f 0xf8 0x00 0x00]

# invalid STRBi12  Rn=PC
[0x0f 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x0f 0xf8 0x00 0x00]

# invalid STRBi8   Rn=PC
[0x0f 0xf8 0x00 0x0c]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x0f 0xf8 0x00 0x0c]

# invalid STRBs    Rn=PC
[0x0f 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x0f 0xf8 0x00 0x00]

# invalid STRHi12  Rn=PC
[0xaf 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xaf 0xf8 0x00 0x00]

# invalid STRHi8   Rn=PC
[0x2f 0xf8 0x00 0x0c]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x2f 0xf8 0x00 0x0c]

# invalid STRHs    Rn=PC
[0x2f 0xf8 0x00 0x00]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x2f 0xf8 0x00 0x00]

# invalid STRBT    Rn=PC
[0x0f 0xf8 0x00 0x0e]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x0f 0xf8 0x00 0x0e]

# invalid STRHT    Rn=PC
[0x2f 0xf8 0x00 0x0e]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x2f 0xf8 0x00 0x0e]

# invalid STRT     Rn=PC
[0x4f 0xf8 0x00 0x0e]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x4f 0xf8 0x00 0x0e]

# Opcode=2137 Name=t2STR_POST Format=ARM_FORMAT_THUMBFRM(25)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 1: 0: 0: 0| 0: 1: 0: 0| 1: 1: 1: 1| 1: 1: 1: 0| 1: 0: 1: 1| 1: 1: 1: 1| 1: 1: 1: 1|
# -------------------------------------------------------------------------------------------------
#
# if Rn == '1111' then UNDEFINED

[0x4f 0xf8 0xff 0xeb]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x4f 0xf8 0xff 0xeb]

#------------------------------------------------------------------------------
# Undefined encodings for strd
#------------------------------------------------------------------------------

# Rt == Rn is UNPREDICTABLE
[0xe4 0xe9 0x02 0x46]
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: [0xe4 0xe9 0x02 0x46]

#------------------------------------------------------------------------------
# Undefined encodings for NEON vld instructions
#------------------------------------------------------------------------------

# size = '00' and index_align == '0001' so UNDEFINED
[0xa0 0xf9 0x10 0x08]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xa0 0xf9 0x10 0x08]


# vld3

# Opcode=871 Name=VLD3DUPd32_UPD Format=ARM_FORMAT_NLdSt(30)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 0: 1: 0: 0| 1: 0: 1: 0| 0: 0: 1: 0| 0: 0: 1: 0| 1: 1: 1: 0| 1: 0: 0: 1| 0: 0: 1: 0|
# -------------------------------------------------------------------------------------------------
#
# A8.6.315 VLD3 (single 3-element structure to all lanes)
# The a bit must be encoded as 0.

[0xa2 0xf9 0x92 0x2e]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xa2 0xf9 0x92 0x2e]


# Some vld4 ones
# size == '11' and a == '0' so UNDEFINED
[0xa0 0xf9 0xc0 0x0f]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xa0 0xf9 0xc0 0x0f]

[0xa0 0xf9 0x30 0x0b]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0xa0 0xf9 0x30 0x0b]


# VLD1 multi-element, type=0b1010 align=0b11
[0x24 0xf9 0xbf 0x8a]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x24 0xf9 0xbf 0x8a]

# VLD1 multi-element type=0b0111 align=0b1x
[0x24 0xf9 0xbf 0x87]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x24 0xf9 0xbf 0x87]

# VLD1 multi-element type=0b0010 align=0b1x
[0x24 0xf9 0xbf 0x86]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x24 0xf9 0xbf 0x86]

# VLD2 multi-element size=0b11
[0x60 0xf9 0xcf 0x08]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0xcf 0x08]

# VLD2 multi-element type=0b1111 align=0b11
[0x60 0xf9 0xbf 0x08]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0xbf 0x08]

# VLD2 multi-element type=0b1001 align=0b11
[0x60 0xf9 0xbf 0x09]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0xbf 0x09]

# VLD3 multi-element size=0b11
[0x60 0xf9 0x7f 0x04]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0x7f 0x04]

# VLD3 multi-element align=0b1x
[0x60 0xf9 0xcf 0x04]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0xcf 0x04]

# VLD4 multi-element size=0b11
[0x60 0xf9 0xcd 0x11]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x60 0xf9 0xcd 0x11]


#------------------------------------------------------------------------------
# Undefined encodings for NEON vst1
#------------------------------------------------------------------------------

# size == '10' and index_align == '0001' so UNDEFINED
[0x80 0xf9 0x10 0x08]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x80 0xf9 0x10 0x08]

# Opcode=1839 Name=VST1d8Twb_register Format=ARM_FORMAT_NLdSt(30)
#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 1: 1| 1: 0: 0: 1| 0: 0: 0: 0| 0: 0: 0: 0| 0: 0: 0: 0| 0: 1: 1: 0| 0: 0: 1: 0| 1: 1: 1: 1|
# -------------------------------------------------------------------------------------------------
#
# A8.6.391 VST1 (multiple single elements)
# This encoding looks like: vst1.8 {d0,d1,d2}, [r0:128]
# But bits 5-4 for the alignment of 128 encoded as align = 0b10, is available only if <list>
# contains two or four registers.  rdar://11220250
[0x00 0xf9 0x2f 0x06]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x00 0xf9 0x2f 0x06]

#------------------------------------------------------------------------------
# Undefined encodings for NEON vst4
#------------------------------------------------------------------------------

[0x80 0xf9 0x30 0x0b]
# CHECK: invalid instruction encoding
# CHECK-NEXT: [0x80 0xf9 0x30 0x0b]


#------------------------------------------------------------------------------
# Unpredictable STMs
#------------------------------------------------------------------------------

# 32-bit Thumb STM instructions cannot have a writeback register which appears
# in the list.

[0xa1 0xe8 0x07 0x04]
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: [0xa1 0xe8 0x07 0x04]

[0x21 0xe9 0x07 0x04]
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: [0x21 0xe9 0x07 0x04]

#------------------------------------------------------------------------------
# SP is invalid as rGPR before ARMv8
#------------------------------------------------------------------------------

[0x00 0xf0 0x00 0x0d]
# CHECK-V7: warning: potentially undefined instruction encoding
# CHECK-V7-NEXT: [0x00 0xf0 0x00 0x0d]

[0x63 0xeb 0x2d 0x46]
# CHECK-V7: warning: potentially undefined instruction encoding
# CHECK-V7-NEXT: [0x63 0xeb 0x2d 0x46]