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qemu/target/mips/mxu_translate.c
Peter Maydell 20b42789aa target/mips/mxu_translate.c: Fix array overrun for D16MIN/D16MAX 
Coverity reported (CID 1450831) an array overrun in
gen_mxu_D16MAX_D16MIN():

  1103     } else if (unlikely((XRb == 0) || (XRa == 0))) {
  ....
  1112         if (opc == OPC_MXU_D16MAX) {
  1113             tcg_gen_smax_i32(mxu_gpr[XRa - 1], t0, t1);
  1114         } else {
  1115             tcg_gen_smin_i32(mxu_gpr[XRa - 1], t0, t1);
  1116         }

>>> Overrunning array "mxu_gpr" of 15 8-byte elements at element
    index 4294967295 (byte offset 34359738367) using index "XRa - 1U"
    (which evaluates to 4294967295).

This happens because the code is confused about which of XRa, XRb and
XRc is the output, and which are the inputs.  XRa is the output, but
most of the conditions separating out different special cases are
written as if XRc is the output, with the result that we can end up
in the code path that assumes XRa is non-0 even when it is zero.

Fix the erroneous code, bringing it in to line with the structure
used in functions like gen_mxu_S32MAX_S32MIN() and
gen_mxu_Q8MAX_Q8MIN().

Fixes: CID 1450831
Fixes: bb84cbf385
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210316131353.4533-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2021-03-22 15:05:41 +01:00

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/*
* Ingenic XBurst Media eXtension Unit (MXU) translation routines.
*
* Copyright (c) 2004-2005 Jocelyn Mayer
* Copyright (c) 2006 Marius Groeger (FPU operations)
* Copyright (c) 2006 Thiemo Seufer (MIPS32R2 support)
* Copyright (c) 2009 CodeSourcery (MIPS16 and microMIPS support)
* Copyright (c) 2012 Jia Liu & Dongxue Zhang (MIPS ASE DSP support)
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* Datasheet:
*
* "XBurst® Instruction Set Architecture MIPS eXtension/enhanced Unit
* Programming Manual", Ingenic Semiconductor Co, Ltd., revision June 2, 2017
*/
#include "qemu/osdep.h"
#include "tcg/tcg-op.h"
#include "exec/helper-gen.h"
#include "translate.h"
/*
*
* AN OVERVIEW OF MXU EXTENSION INSTRUCTION SET
* ============================================
*
*
* MXU (full name: MIPS eXtension/enhanced Unit) is a SIMD extension of MIPS32
* instructions set. It is designed to fit the needs of signal, graphical and
* video processing applications. MXU instruction set is used in Xburst family
* of microprocessors by Ingenic.
*
* MXU unit contains 17 registers called X0-X16. X0 is always zero, and X16 is
* the control register.
*
*
* The notation used in MXU assembler mnemonics
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Register operands:
*
* XRa, XRb, XRc, XRd - MXU registers
* Rb, Rc, Rd, Rs, Rt - general purpose MIPS registers
*
* Non-register operands:
*
* aptn1 - 1-bit accumulate add/subtract pattern
* aptn2 - 2-bit accumulate add/subtract pattern
* eptn2 - 2-bit execute add/subtract pattern
* optn2 - 2-bit operand pattern
* optn3 - 3-bit operand pattern
* sft4 - 4-bit shift amount
* strd2 - 2-bit stride amount
*
* Prefixes:
*
* Level of parallelism: Operand size:
* S - single operation at a time 32 - word
* D - two operations in parallel 16 - half word
* Q - four operations in parallel 8 - byte
*
* Operations:
*
* ADD - Add or subtract
* ADDC - Add with carry-in
* ACC - Accumulate
* ASUM - Sum together then accumulate (add or subtract)
* ASUMC - Sum together then accumulate (add or subtract) with carry-in
* AVG - Average between 2 operands
* ABD - Absolute difference
* ALN - Align data
* AND - Logical bitwise 'and' operation
* CPS - Copy sign
* EXTR - Extract bits
* I2M - Move from GPR register to MXU register
* LDD - Load data from memory to XRF
* LDI - Load data from memory to XRF (and increase the address base)
* LUI - Load unsigned immediate
* MUL - Multiply
* MULU - Unsigned multiply
* MADD - 64-bit operand add 32x32 product
* MSUB - 64-bit operand subtract 32x32 product
* MAC - Multiply and accumulate (add or subtract)
* MAD - Multiply and add or subtract
* MAX - Maximum between 2 operands
* MIN - Minimum between 2 operands
* M2I - Move from MXU register to GPR register
* MOVZ - Move if zero
* MOVN - Move if non-zero
* NOR - Logical bitwise 'nor' operation
* OR - Logical bitwise 'or' operation
* STD - Store data from XRF to memory
* SDI - Store data from XRF to memory (and increase the address base)
* SLT - Set of less than comparison
* SAD - Sum of absolute differences
* SLL - Logical shift left
* SLR - Logical shift right
* SAR - Arithmetic shift right
* SAT - Saturation
* SFL - Shuffle
* SCOP - Calculate x’s scope (-1, means x<0; 0, means x==0; 1, means x>0)
* XOR - Logical bitwise 'exclusive or' operation
*
* Suffixes:
*
* E - Expand results
* F - Fixed point multiplication
* L - Low part result
* R - Doing rounding
* V - Variable instead of immediate
* W - Combine above L and V
*
*
* The list of MXU instructions grouped by functionality
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Load/Store instructions Multiplication instructions
* ----------------------- ---------------------------
*
* S32LDD XRa, Rb, s12 S32MADD XRa, XRd, Rs, Rt
* S32STD XRa, Rb, s12 S32MADDU XRa, XRd, Rs, Rt
* S32LDDV XRa, Rb, rc, strd2 S32MSUB XRa, XRd, Rs, Rt
* S32STDV XRa, Rb, rc, strd2 S32MSUBU XRa, XRd, Rs, Rt
* S32LDI XRa, Rb, s12 S32MUL XRa, XRd, Rs, Rt
* S32SDI XRa, Rb, s12 S32MULU XRa, XRd, Rs, Rt
* S32LDIV XRa, Rb, rc, strd2 D16MUL XRa, XRb, XRc, XRd, optn2
* S32SDIV XRa, Rb, rc, strd2 D16MULE XRa, XRb, XRc, optn2
* S32LDDR XRa, Rb, s12 D16MULF XRa, XRb, XRc, optn2
* S32STDR XRa, Rb, s12 D16MAC XRa, XRb, XRc, XRd, aptn2, optn2
* S32LDDVR XRa, Rb, rc, strd2 D16MACE XRa, XRb, XRc, XRd, aptn2, optn2
* S32STDVR XRa, Rb, rc, strd2 D16MACF XRa, XRb, XRc, XRd, aptn2, optn2
* S32LDIR XRa, Rb, s12 D16MADL XRa, XRb, XRc, XRd, aptn2, optn2
* S32SDIR XRa, Rb, s12 S16MAD XRa, XRb, XRc, XRd, aptn1, optn2
* S32LDIVR XRa, Rb, rc, strd2 Q8MUL XRa, XRb, XRc, XRd
* S32SDIVR XRa, Rb, rc, strd2 Q8MULSU XRa, XRb, XRc, XRd
* S16LDD XRa, Rb, s10, eptn2 Q8MAC XRa, XRb, XRc, XRd, aptn2
* S16STD XRa, Rb, s10, eptn2 Q8MACSU XRa, XRb, XRc, XRd, aptn2
* S16LDI XRa, Rb, s10, eptn2 Q8MADL XRa, XRb, XRc, XRd, aptn2
* S16SDI XRa, Rb, s10, eptn2
* S8LDD XRa, Rb, s8, eptn3
* S8STD XRa, Rb, s8, eptn3 Addition and subtraction instructions
* S8LDI XRa, Rb, s8, eptn3 -------------------------------------
* S8SDI XRa, Rb, s8, eptn3
* LXW Rd, Rs, Rt, strd2 D32ADD XRa, XRb, XRc, XRd, eptn2
* LXH Rd, Rs, Rt, strd2 D32ADDC XRa, XRb, XRc, XRd
* LXHU Rd, Rs, Rt, strd2 D32ACC XRa, XRb, XRc, XRd, eptn2
* LXB Rd, Rs, Rt, strd2 D32ACCM XRa, XRb, XRc, XRd, eptn2
* LXBU Rd, Rs, Rt, strd2 D32ASUM XRa, XRb, XRc, XRd, eptn2
* S32CPS XRa, XRb, XRc
* Q16ADD XRa, XRb, XRc, XRd, eptn2, optn2
* Comparison instructions Q16ACC XRa, XRb, XRc, XRd, eptn2
* ----------------------- Q16ACCM XRa, XRb, XRc, XRd, eptn2
* D16ASUM XRa, XRb, XRc, XRd, eptn2
* S32MAX XRa, XRb, XRc D16CPS XRa, XRb,
* S32MIN XRa, XRb, XRc D16AVG XRa, XRb, XRc
* S32SLT XRa, XRb, XRc D16AVGR XRa, XRb, XRc
* S32MOVZ XRa, XRb, XRc Q8ADD XRa, XRb, XRc, eptn2
* S32MOVN XRa, XRb, XRc Q8ADDE XRa, XRb, XRc, XRd, eptn2
* D16MAX XRa, XRb, XRc Q8ACCE XRa, XRb, XRc, XRd, eptn2
* D16MIN XRa, XRb, XRc Q8ABD XRa, XRb, XRc
* D16SLT XRa, XRb, XRc Q8SAD XRa, XRb, XRc, XRd
* D16MOVZ XRa, XRb, XRc Q8AVG XRa, XRb, XRc
* D16MOVN XRa, XRb, XRc Q8AVGR XRa, XRb, XRc
* Q8MAX XRa, XRb, XRc D8SUM XRa, XRb, XRc, XRd
* Q8MIN XRa, XRb, XRc D8SUMC XRa, XRb, XRc, XRd
* Q8SLT XRa, XRb, XRc
* Q8SLTU XRa, XRb, XRc
* Q8MOVZ XRa, XRb, XRc Shift instructions
* Q8MOVN XRa, XRb, XRc ------------------
*
* D32SLL XRa, XRb, XRc, XRd, sft4
* Bitwise instructions D32SLR XRa, XRb, XRc, XRd, sft4
* -------------------- D32SAR XRa, XRb, XRc, XRd, sft4
* D32SARL XRa, XRb, XRc, sft4
* S32NOR XRa, XRb, XRc D32SLLV XRa, XRb, Rb
* S32AND XRa, XRb, XRc D32SLRV XRa, XRb, Rb
* S32XOR XRa, XRb, XRc D32SARV XRa, XRb, Rb
* S32OR XRa, XRb, XRc D32SARW XRa, XRb, XRc, Rb
* Q16SLL XRa, XRb, XRc, XRd, sft4
* Q16SLR XRa, XRb, XRc, XRd, sft4
* Miscellaneous instructions Q16SAR XRa, XRb, XRc, XRd, sft4
* ------------------------- Q16SLLV XRa, XRb, Rb
* Q16SLRV XRa, XRb, Rb
* S32SFL XRa, XRb, XRc, XRd, optn2 Q16SARV XRa, XRb, Rb
* S32ALN XRa, XRb, XRc, Rb
* S32ALNI XRa, XRb, XRc, s3
* S32LUI XRa, s8, optn3 Move instructions
* S32EXTR XRa, XRb, Rb, bits5 -----------------
* S32EXTRV XRa, XRb, Rs, Rt
* Q16SCOP XRa, XRb, XRc, XRd S32M2I XRa, Rb
* Q16SAT XRa, XRb, XRc S32I2M XRa, Rb
*
*
* The opcode organization of MXU instructions
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* The bits 31..26 of all MXU instructions are equal to 0x1C (also referred
* as opcode SPECIAL2 in the base MIPS ISA). The organization and meaning of
* other bits up to the instruction level is as follows:
*
* bits
* 05..00
*
* ┌─ 000000 ─ OPC_MXU_S32MADD
* ├─ 000001 ─ OPC_MXU_S32MADDU
* ├─ 000010 ─ <not assigned> (non-MXU OPC_MUL)
* │
* │ 20..18
* ├─ 000011 ─ OPC_MXU__POOL00 ─┬─ 000 ─ OPC_MXU_S32MAX
* │ ├─ 001 ─ OPC_MXU_S32MIN
* │ ├─ 010 ─ OPC_MXU_D16MAX
* │ ├─ 011 ─ OPC_MXU_D16MIN
* │ ├─ 100 ─ OPC_MXU_Q8MAX
* │ ├─ 101 ─ OPC_MXU_Q8MIN
* │ ├─ 110 ─ OPC_MXU_Q8SLT
* │ └─ 111 ─ OPC_MXU_Q8SLTU
* ├─ 000100 ─ OPC_MXU_S32MSUB
* ├─ 000101 ─ OPC_MXU_S32MSUBU 20..18
* ├─ 000110 ─ OPC_MXU__POOL01 ─┬─ 000 ─ OPC_MXU_S32SLT
* │ ├─ 001 ─ OPC_MXU_D16SLT
* │ ├─ 010 ─ OPC_MXU_D16AVG
* │ ├─ 011 ─ OPC_MXU_D16AVGR
* │ ├─ 100 ─ OPC_MXU_Q8AVG
* │ ├─ 101 ─ OPC_MXU_Q8AVGR
* │ └─ 111 ─ OPC_MXU_Q8ADD
* │
* │ 20..18
* ├─ 000111 ─ OPC_MXU__POOL02 ─┬─ 000 ─ OPC_MXU_S32CPS
* │ ├─ 010 ─ OPC_MXU_D16CPS
* │ ├─ 100 ─ OPC_MXU_Q8ABD
* │ └─ 110 ─ OPC_MXU_Q16SAT
* ├─ 001000 ─ OPC_MXU_D16MUL
* │ 25..24
* ├─ 001001 ─ OPC_MXU__POOL03 ─┬─ 00 ─ OPC_MXU_D16MULF
* │ └─ 01 ─ OPC_MXU_D16MULE
* ├─ 001010 ─ OPC_MXU_D16MAC
* ├─ 001011 ─ OPC_MXU_D16MACF
* ├─ 001100 ─ OPC_MXU_D16MADL
* ├─ 001101 ─ OPC_MXU_S16MAD
* ├─ 001110 ─ OPC_MXU_Q16ADD
* ├─ 001111 ─ OPC_MXU_D16MACE 23
* │ ┌─ 0 ─ OPC_MXU_S32LDD
* ├─ 010000 ─ OPC_MXU__POOL04 ─┴─ 1 ─ OPC_MXU_S32LDDR
* │
* │ 23
* ├─ 010001 ─ OPC_MXU__POOL05 ─┬─ 0 ─ OPC_MXU_S32STD
* │ └─ 1 ─ OPC_MXU_S32STDR
* │
* │ 13..10
* ├─ 010010 ─ OPC_MXU__POOL06 ─┬─ 0000 ─ OPC_MXU_S32LDDV
* │ └─ 0001 ─ OPC_MXU_S32LDDVR
* │
* │ 13..10
* ├─ 010011 ─ OPC_MXU__POOL07 ─┬─ 0000 ─ OPC_MXU_S32STDV
* │ └─ 0001 ─ OPC_MXU_S32STDVR
* │
* │ 23
* ├─ 010100 ─ OPC_MXU__POOL08 ─┬─ 0 ─ OPC_MXU_S32LDI
* │ └─ 1 ─ OPC_MXU_S32LDIR
* │
* │ 23
* ├─ 010101 ─ OPC_MXU__POOL09 ─┬─ 0 ─ OPC_MXU_S32SDI
* │ └─ 1 ─ OPC_MXU_S32SDIR
* │
* │ 13..10
* ├─ 010110 ─ OPC_MXU__POOL10 ─┬─ 0000 ─ OPC_MXU_S32LDIV
* │ └─ 0001 ─ OPC_MXU_S32LDIVR
* │
* │ 13..10
* ├─ 010111 ─ OPC_MXU__POOL11 ─┬─ 0000 ─ OPC_MXU_S32SDIV
* │ └─ 0001 ─ OPC_MXU_S32SDIVR
* ├─ 011000 ─ OPC_MXU_D32ADD
* │ 23..22
* MXU ├─ 011001 ─ OPC_MXU__POOL12 ─┬─ 00 ─ OPC_MXU_D32ACC
* opcodes ─┤ ├─ 01 ─ OPC_MXU_D32ACCM
* │ └─ 10 ─ OPC_MXU_D32ASUM
* ├─ 011010 ─ <not assigned>
* │ 23..22
* ├─ 011011 ─ OPC_MXU__POOL13 ─┬─ 00 ─ OPC_MXU_Q16ACC
* │ ├─ 01 ─ OPC_MXU_Q16ACCM
* │ └─ 10 ─ OPC_MXU_Q16ASUM
* │
* │ 23..22
* ├─ 011100 ─ OPC_MXU__POOL14 ─┬─ 00 ─ OPC_MXU_Q8ADDE
* │ ├─ 01 ─ OPC_MXU_D8SUM
* ├─ 011101 ─ OPC_MXU_Q8ACCE └─ 10 ─ OPC_MXU_D8SUMC
* ├─ 011110 ─ <not assigned>
* ├─ 011111 ─ <not assigned>
* ├─ 100000 ─ <not assigned> (overlaps with CLZ)
* ├─ 100001 ─ <not assigned> (overlaps with CLO)
* ├─ 100010 ─ OPC_MXU_S8LDD
* ├─ 100011 ─ OPC_MXU_S8STD 15..14
* ├─ 100100 ─ OPC_MXU_S8LDI ┌─ 00 ─ OPC_MXU_S32MUL
* ├─ 100101 ─ OPC_MXU_S8SDI ├─ 00 ─ OPC_MXU_S32MULU
* │ ├─ 00 ─ OPC_MXU_S32EXTR
* ├─ 100110 ─ OPC_MXU__POOL15 ─┴─ 00 ─ OPC_MXU_S32EXTRV
* │
* │ 20..18
* ├─ 100111 ─ OPC_MXU__POOL16 ─┬─ 000 ─ OPC_MXU_D32SARW
* │ ├─ 001 ─ OPC_MXU_S32ALN
* │ ├─ 010 ─ OPC_MXU_S32ALNI
* │ ├─ 011 ─ OPC_MXU_S32LUI
* │ ├─ 100 ─ OPC_MXU_S32NOR
* │ ├─ 101 ─ OPC_MXU_S32AND
* │ ├─ 110 ─ OPC_MXU_S32OR
* │ └─ 111 ─ OPC_MXU_S32XOR
* │
* │ 7..5
* ├─ 101000 ─ OPC_MXU__POOL17 ─┬─ 000 ─ OPC_MXU_LXB
* │ ├─ 001 ─ OPC_MXU_LXH
* ├─ 101001 ─ <not assigned> ├─ 011 ─ OPC_MXU_LXW
* ├─ 101010 ─ OPC_MXU_S16LDD ├─ 100 ─ OPC_MXU_LXBU
* ├─ 101011 ─ OPC_MXU_S16STD └─ 101 ─ OPC_MXU_LXHU
* ├─ 101100 ─ OPC_MXU_S16LDI
* ├─ 101101 ─ OPC_MXU_S16SDI
* ├─ 101110 ─ OPC_MXU_S32M2I
* ├─ 101111 ─ OPC_MXU_S32I2M
* ├─ 110000 ─ OPC_MXU_D32SLL
* ├─ 110001 ─ OPC_MXU_D32SLR 20..18
* ├─ 110010 ─ OPC_MXU_D32SARL ┌─ 000 ─ OPC_MXU_D32SLLV
* ├─ 110011 ─ OPC_MXU_D32SAR ├─ 001 ─ OPC_MXU_D32SLRV
* ├─ 110100 ─ OPC_MXU_Q16SLL ├─ 010 ─ OPC_MXU_D32SARV
* ├─ 110101 ─ OPC_MXU_Q16SLR ├─ 011 ─ OPC_MXU_Q16SLLV
* │ ├─ 100 ─ OPC_MXU_Q16SLRV
* ├─ 110110 ─ OPC_MXU__POOL18 ─┴─ 101 ─ OPC_MXU_Q16SARV
* │
* ├─ 110111 ─ OPC_MXU_Q16SAR
* │ 23..22
* ├─ 111000 ─ OPC_MXU__POOL19 ─┬─ 00 ─ OPC_MXU_Q8MUL
* │ └─ 01 ─ OPC_MXU_Q8MULSU
* │
* │ 20..18
* ├─ 111001 ─ OPC_MXU__POOL20 ─┬─ 000 ─ OPC_MXU_Q8MOVZ
* │ ├─ 001 ─ OPC_MXU_Q8MOVN
* │ ├─ 010 ─ OPC_MXU_D16MOVZ
* │ ├─ 011 ─ OPC_MXU_D16MOVN
* │ ├─ 100 ─ OPC_MXU_S32MOVZ
* │ └─ 101 ─ OPC_MXU_S32MOVN
* │
* │ 23..22
* ├─ 111010 ─ OPC_MXU__POOL21 ─┬─ 00 ─ OPC_MXU_Q8MAC
* │ └─ 10 ─ OPC_MXU_Q8MACSU
* ├─ 111011 ─ OPC_MXU_Q16SCOP
* ├─ 111100 ─ OPC_MXU_Q8MADL
* ├─ 111101 ─ OPC_MXU_S32SFL
* ├─ 111110 ─ OPC_MXU_Q8SAD
* └─ 111111 ─ <not assigned> (overlaps with SDBBP)
*
*
* Compiled after:
*
* "XBurst® Instruction Set Architecture MIPS eXtension/enhanced Unit
* Programming Manual", Ingenic Semiconductor Co, Ltd., revision June 2, 2017
*/
enum {
OPC_MXU__POOL00 = 0x03,
OPC_MXU_D16MUL = 0x08,
OPC_MXU_D16MAC = 0x0A,
OPC_MXU__POOL04 = 0x10,
OPC_MXU_S8LDD = 0x22,
OPC_MXU__POOL16 = 0x27,
OPC_MXU_S32M2I = 0x2E,
OPC_MXU_S32I2M = 0x2F,
OPC_MXU__POOL19 = 0x38,
};
/*
* MXU pool 00
*/
enum {
OPC_MXU_S32MAX = 0x00,
OPC_MXU_S32MIN = 0x01,
OPC_MXU_D16MAX = 0x02,
OPC_MXU_D16MIN = 0x03,
OPC_MXU_Q8MAX = 0x04,
OPC_MXU_Q8MIN = 0x05,
};
/*
* MXU pool 04
*/
enum {
OPC_MXU_S32LDD = 0x00,
OPC_MXU_S32LDDR = 0x01,
};
/*
* MXU pool 16
*/
enum {
OPC_MXU_S32ALNI = 0x02,
OPC_MXU_S32NOR = 0x04,
OPC_MXU_S32AND = 0x05,
OPC_MXU_S32OR = 0x06,
OPC_MXU_S32XOR = 0x07,
};
/*
* MXU pool 19
*/
enum {
OPC_MXU_Q8MUL = 0x00,
OPC_MXU_Q8MULSU = 0x01,
};
/* MXU accumulate add/subtract 1-bit pattern 'aptn1' */
#define MXU_APTN1_A 0
#define MXU_APTN1_S 1
/* MXU accumulate add/subtract 2-bit pattern 'aptn2' */
#define MXU_APTN2_AA 0
#define MXU_APTN2_AS 1
#define MXU_APTN2_SA 2
#define MXU_APTN2_SS 3
/* MXU execute add/subtract 2-bit pattern 'eptn2' */
#define MXU_EPTN2_AA 0
#define MXU_EPTN2_AS 1
#define MXU_EPTN2_SA 2
#define MXU_EPTN2_SS 3
/* MXU operand getting pattern 'optn2' */
#define MXU_OPTN2_PTN0 0
#define MXU_OPTN2_PTN1 1
#define MXU_OPTN2_PTN2 2
#define MXU_OPTN2_PTN3 3
/* alternative naming scheme for 'optn2' */
#define MXU_OPTN2_WW 0
#define MXU_OPTN2_LW 1
#define MXU_OPTN2_HW 2
#define MXU_OPTN2_XW 3
/* MXU operand getting pattern 'optn3' */
#define MXU_OPTN3_PTN0 0
#define MXU_OPTN3_PTN1 1
#define MXU_OPTN3_PTN2 2
#define MXU_OPTN3_PTN3 3
#define MXU_OPTN3_PTN4 4
#define MXU_OPTN3_PTN5 5
#define MXU_OPTN3_PTN6 6
#define MXU_OPTN3_PTN7 7
/* MXU registers */
static TCGv mxu_gpr[NUMBER_OF_MXU_REGISTERS - 1];
static TCGv mxu_CR;
static const char * const mxuregnames[] = {
"XR1", "XR2", "XR3", "XR4", "XR5", "XR6", "XR7", "XR8",
"XR9", "XR10", "XR11", "XR12", "XR13", "XR14", "XR15", "MXU_CR",
};
void mxu_translate_init(void)
{
for (unsigned i = 0; i < NUMBER_OF_MXU_REGISTERS - 1; i++) {
mxu_gpr[i] = tcg_global_mem_new(cpu_env,
offsetof(CPUMIPSState, active_tc.mxu_gpr[i]),
mxuregnames[i]);
}
mxu_CR = tcg_global_mem_new(cpu_env,
offsetof(CPUMIPSState, active_tc.mxu_cr),
mxuregnames[NUMBER_OF_MXU_REGISTERS - 1]);
}
/* MXU General purpose registers moves. */
static inline void gen_load_mxu_gpr(TCGv t, unsigned int reg)
{
if (reg == 0) {
tcg_gen_movi_tl(t, 0);
} else if (reg <= 15) {
tcg_gen_mov_tl(t, mxu_gpr[reg - 1]);
}
}
static inline void gen_store_mxu_gpr(TCGv t, unsigned int reg)
{
if (reg > 0 && reg <= 15) {
tcg_gen_mov_tl(mxu_gpr[reg - 1], t);
}
}
/* MXU control register moves. */
static inline void gen_load_mxu_cr(TCGv t)
{
tcg_gen_mov_tl(t, mxu_CR);
}
static inline void gen_store_mxu_cr(TCGv t)
{
/* TODO: Add handling of RW rules for MXU_CR. */
tcg_gen_mov_tl(mxu_CR, t);
}
/*
* S32I2M XRa, rb - Register move from GRF to XRF
*/
static void gen_mxu_s32i2m(DisasContext *ctx)
{
TCGv t0;
uint32_t XRa, Rb;
t0 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 5);
Rb = extract32(ctx->opcode, 16, 5);
gen_load_gpr(t0, Rb);
if (XRa <= 15) {
gen_store_mxu_gpr(t0, XRa);
} else if (XRa == 16) {
gen_store_mxu_cr(t0);
}
tcg_temp_free(t0);
}
/*
* S32M2I XRa, rb - Register move from XRF to GRF
*/
static void gen_mxu_s32m2i(DisasContext *ctx)
{
TCGv t0;
uint32_t XRa, Rb;
t0 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 5);
Rb = extract32(ctx->opcode, 16, 5);
if (XRa <= 15) {
gen_load_mxu_gpr(t0, XRa);
} else if (XRa == 16) {
gen_load_mxu_cr(t0);
}
gen_store_gpr(t0, Rb);
tcg_temp_free(t0);
}
/*
* S8LDD XRa, Rb, s8, optn3 - Load a byte from memory to XRF
*/
static void gen_mxu_s8ldd(DisasContext *ctx)
{
TCGv t0, t1;
uint32_t XRa, Rb, s8, optn3;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 4);
s8 = extract32(ctx->opcode, 10, 8);
optn3 = extract32(ctx->opcode, 18, 3);
Rb = extract32(ctx->opcode, 21, 5);
gen_load_gpr(t0, Rb);
tcg_gen_addi_tl(t0, t0, (int8_t)s8);
switch (optn3) {
/* XRa[7:0] = tmp8 */
case MXU_OPTN3_PTN0:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
gen_load_mxu_gpr(t0, XRa);
tcg_gen_deposit_tl(t0, t0, t1, 0, 8);
break;
/* XRa[15:8] = tmp8 */
case MXU_OPTN3_PTN1:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
gen_load_mxu_gpr(t0, XRa);
tcg_gen_deposit_tl(t0, t0, t1, 8, 8);
break;
/* XRa[23:16] = tmp8 */
case MXU_OPTN3_PTN2:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
gen_load_mxu_gpr(t0, XRa);
tcg_gen_deposit_tl(t0, t0, t1, 16, 8);
break;
/* XRa[31:24] = tmp8 */
case MXU_OPTN3_PTN3:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
gen_load_mxu_gpr(t0, XRa);
tcg_gen_deposit_tl(t0, t0, t1, 24, 8);
break;
/* XRa = {8'b0, tmp8, 8'b0, tmp8} */
case MXU_OPTN3_PTN4:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
tcg_gen_deposit_tl(t0, t1, t1, 16, 16);
break;
/* XRa = {tmp8, 8'b0, tmp8, 8'b0} */
case MXU_OPTN3_PTN5:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
tcg_gen_shli_tl(t1, t1, 8);
tcg_gen_deposit_tl(t0, t1, t1, 16, 16);
break;
/* XRa = {{8{sign of tmp8}}, tmp8, {8{sign of tmp8}}, tmp8} */
case MXU_OPTN3_PTN6:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_SB);
tcg_gen_mov_tl(t0, t1);
tcg_gen_andi_tl(t0, t0, 0xFF00FFFF);
tcg_gen_shli_tl(t1, t1, 16);
tcg_gen_or_tl(t0, t0, t1);
break;
/* XRa = {tmp8, tmp8, tmp8, tmp8} */
case MXU_OPTN3_PTN7:
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, MO_UB);
tcg_gen_deposit_tl(t1, t1, t1, 8, 8);
tcg_gen_deposit_tl(t0, t1, t1, 16, 16);
break;
}
gen_store_mxu_gpr(t0, XRa);
tcg_temp_free(t0);
tcg_temp_free(t1);
}
/*
* D16MUL XRa, XRb, XRc, XRd, optn2 - Signed 16 bit pattern multiplication
*/
static void gen_mxu_d16mul(DisasContext *ctx)
{
TCGv t0, t1, t2, t3;
uint32_t XRa, XRb, XRc, XRd, optn2;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
t2 = tcg_temp_new();
t3 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRc = extract32(ctx->opcode, 14, 4);
XRd = extract32(ctx->opcode, 18, 4);
optn2 = extract32(ctx->opcode, 22, 2);
gen_load_mxu_gpr(t1, XRb);
tcg_gen_sextract_tl(t0, t1, 0, 16);
tcg_gen_sextract_tl(t1, t1, 16, 16);
gen_load_mxu_gpr(t3, XRc);
tcg_gen_sextract_tl(t2, t3, 0, 16);
tcg_gen_sextract_tl(t3, t3, 16, 16);
switch (optn2) {
case MXU_OPTN2_WW: /* XRB.H*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(t3, t1, t3);
tcg_gen_mul_tl(t2, t0, t2);
break;
case MXU_OPTN2_LW: /* XRB.L*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(t3, t0, t3);
tcg_gen_mul_tl(t2, t0, t2);
break;
case MXU_OPTN2_HW: /* XRB.H*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(t3, t1, t3);
tcg_gen_mul_tl(t2, t1, t2);
break;
case MXU_OPTN2_XW: /* XRB.L*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(t3, t0, t3);
tcg_gen_mul_tl(t2, t1, t2);
break;
}
gen_store_mxu_gpr(t3, XRa);
gen_store_mxu_gpr(t2, XRd);
tcg_temp_free(t0);
tcg_temp_free(t1);
tcg_temp_free(t2);
tcg_temp_free(t3);
}
/*
* D16MAC XRa, XRb, XRc, XRd, aptn2, optn2 - Signed 16 bit pattern multiply
* and accumulate
*/
static void gen_mxu_d16mac(DisasContext *ctx)
{
TCGv t0, t1, t2, t3;
uint32_t XRa, XRb, XRc, XRd, optn2, aptn2;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
t2 = tcg_temp_new();
t3 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRc = extract32(ctx->opcode, 14, 4);
XRd = extract32(ctx->opcode, 18, 4);
optn2 = extract32(ctx->opcode, 22, 2);
aptn2 = extract32(ctx->opcode, 24, 2);
gen_load_mxu_gpr(t1, XRb);
tcg_gen_sextract_tl(t0, t1, 0, 16);
tcg_gen_sextract_tl(t1, t1, 16, 16);
gen_load_mxu_gpr(t3, XRc);
tcg_gen_sextract_tl(t2, t3, 0, 16);
tcg_gen_sextract_tl(t3, t3, 16, 16);
switch (optn2) {
case MXU_OPTN2_WW: /* XRB.H*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(t3, t1, t3);
tcg_gen_mul_tl(t2, t0, t2);
break;
case MXU_OPTN2_LW: /* XRB.L*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(t3, t0, t3);
tcg_gen_mul_tl(t2, t0, t2);
break;
case MXU_OPTN2_HW: /* XRB.H*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(t3, t1, t3);
tcg_gen_mul_tl(t2, t1, t2);
break;
case MXU_OPTN2_XW: /* XRB.L*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(t3, t0, t3);
tcg_gen_mul_tl(t2, t1, t2);
break;
}
gen_load_mxu_gpr(t0, XRa);
gen_load_mxu_gpr(t1, XRd);
switch (aptn2) {
case MXU_APTN2_AA:
tcg_gen_add_tl(t3, t0, t3);
tcg_gen_add_tl(t2, t1, t2);
break;
case MXU_APTN2_AS:
tcg_gen_add_tl(t3, t0, t3);
tcg_gen_sub_tl(t2, t1, t2);
break;
case MXU_APTN2_SA:
tcg_gen_sub_tl(t3, t0, t3);
tcg_gen_add_tl(t2, t1, t2);
break;
case MXU_APTN2_SS:
tcg_gen_sub_tl(t3, t0, t3);
tcg_gen_sub_tl(t2, t1, t2);
break;
}
gen_store_mxu_gpr(t3, XRa);
gen_store_mxu_gpr(t2, XRd);
tcg_temp_free(t0);
tcg_temp_free(t1);
tcg_temp_free(t2);
tcg_temp_free(t3);
}
/*
* Q8MUL XRa, XRb, XRc, XRd - Parallel unsigned 8 bit pattern multiply
* Q8MULSU XRa, XRb, XRc, XRd - Parallel signed 8 bit pattern multiply
*/
static void gen_mxu_q8mul_q8mulsu(DisasContext *ctx)
{
TCGv t0, t1, t2, t3, t4, t5, t6, t7;
uint32_t XRa, XRb, XRc, XRd, sel;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
t2 = tcg_temp_new();
t3 = tcg_temp_new();
t4 = tcg_temp_new();
t5 = tcg_temp_new();
t6 = tcg_temp_new();
t7 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRc = extract32(ctx->opcode, 14, 4);
XRd = extract32(ctx->opcode, 18, 4);
sel = extract32(ctx->opcode, 22, 2);
gen_load_mxu_gpr(t3, XRb);
gen_load_mxu_gpr(t7, XRc);
if (sel == 0x2) {
/* Q8MULSU */
tcg_gen_ext8s_tl(t0, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8s_tl(t1, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8s_tl(t2, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8s_tl(t3, t3);
} else {
/* Q8MUL */
tcg_gen_ext8u_tl(t0, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8u_tl(t1, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8u_tl(t2, t3);
tcg_gen_shri_tl(t3, t3, 8);
tcg_gen_ext8u_tl(t3, t3);
}
tcg_gen_ext8u_tl(t4, t7);
tcg_gen_shri_tl(t7, t7, 8);
tcg_gen_ext8u_tl(t5, t7);
tcg_gen_shri_tl(t7, t7, 8);
tcg_gen_ext8u_tl(t6, t7);
tcg_gen_shri_tl(t7, t7, 8);
tcg_gen_ext8u_tl(t7, t7);
tcg_gen_mul_tl(t0, t0, t4);
tcg_gen_mul_tl(t1, t1, t5);
tcg_gen_mul_tl(t2, t2, t6);
tcg_gen_mul_tl(t3, t3, t7);
tcg_gen_andi_tl(t0, t0, 0xFFFF);
tcg_gen_andi_tl(t1, t1, 0xFFFF);
tcg_gen_andi_tl(t2, t2, 0xFFFF);
tcg_gen_andi_tl(t3, t3, 0xFFFF);
tcg_gen_shli_tl(t1, t1, 16);
tcg_gen_shli_tl(t3, t3, 16);
tcg_gen_or_tl(t0, t0, t1);
tcg_gen_or_tl(t1, t2, t3);
gen_store_mxu_gpr(t0, XRd);
gen_store_mxu_gpr(t1, XRa);
tcg_temp_free(t0);
tcg_temp_free(t1);
tcg_temp_free(t2);
tcg_temp_free(t3);
tcg_temp_free(t4);
tcg_temp_free(t5);
tcg_temp_free(t6);
tcg_temp_free(t7);
}
/*
* S32LDD XRa, Rb, S12 - Load a word from memory to XRF
* S32LDDR XRa, Rb, S12 - Load a word from memory to XRF, reversed byte seq.
*/
static void gen_mxu_s32ldd_s32lddr(DisasContext *ctx)
{
TCGv t0, t1;
uint32_t XRa, Rb, s12, sel;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
XRa = extract32(ctx->opcode, 6, 4);
s12 = extract32(ctx->opcode, 10, 10);
sel = extract32(ctx->opcode, 20, 1);
Rb = extract32(ctx->opcode, 21, 5);
gen_load_gpr(t0, Rb);
tcg_gen_movi_tl(t1, s12);
tcg_gen_shli_tl(t1, t1, 2);
if (s12 & 0x200) {
tcg_gen_ori_tl(t1, t1, 0xFFFFF000);
}
tcg_gen_add_tl(t1, t0, t1);
tcg_gen_qemu_ld_tl(t1, t1, ctx->mem_idx, MO_SL);
if (sel == 1) {
/* S32LDDR */
tcg_gen_bswap32_tl(t1, t1);
}
gen_store_mxu_gpr(t1, XRa);
tcg_temp_free(t0);
tcg_temp_free(t1);
}
/*
* MXU instruction category: logic
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* S32NOR S32AND S32OR S32XOR
*/
/*
* S32NOR XRa, XRb, XRc
* Update XRa with the result of logical bitwise 'nor' operation
* applied to the content of XRb and XRc.
*/
static void gen_mxu_S32NOR(DisasContext *ctx)
{
uint32_t pad, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to all 1s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0xFFFFFFFF);
} else if (unlikely(XRb == 0)) {
/* XRb zero register -> just set destination to the negation of XRc */
tcg_gen_not_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1]);
} else if (unlikely(XRc == 0)) {
/* XRa zero register -> just set destination to the negation of XRb */
tcg_gen_not_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to the negation of XRb */
tcg_gen_not_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
tcg_gen_nor_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], mxu_gpr[XRc - 1]);
}
}
/*
* S32AND XRa, XRb, XRc
* Update XRa with the result of logical bitwise 'and' operation
* applied to the content of XRb and XRc.
*/
static void gen_mxu_S32AND(DisasContext *ctx)
{
uint32_t pad, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) || (XRc == 0))) {
/* one of operands zero register -> just set destination to all 0s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to one of them */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
tcg_gen_and_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], mxu_gpr[XRc - 1]);
}
}
/*
* S32OR XRa, XRb, XRc
* Update XRa with the result of logical bitwise 'or' operation
* applied to the content of XRb and XRc.
*/
static void gen_mxu_S32OR(DisasContext *ctx)
{
uint32_t pad, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to all 0s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely(XRb == 0)) {
/* XRb zero register -> just set destination to the content of XRc */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1]);
} else if (unlikely(XRc == 0)) {
/* XRc zero register -> just set destination to the content of XRb */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to one of them */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
tcg_gen_or_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], mxu_gpr[XRc - 1]);
}
}
/*
* S32XOR XRa, XRb, XRc
* Update XRa with the result of logical bitwise 'xor' operation
* applied to the content of XRb and XRc.
*/
static void gen_mxu_S32XOR(DisasContext *ctx)
{
uint32_t pad, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to all 0s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely(XRb == 0)) {
/* XRb zero register -> just set destination to the content of XRc */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1]);
} else if (unlikely(XRc == 0)) {
/* XRc zero register -> just set destination to the content of XRb */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to all 0s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else {
/* the most general case */
tcg_gen_xor_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], mxu_gpr[XRc - 1]);
}
}
/*
* MXU instruction category max/min
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* S32MAX D16MAX Q8MAX
* S32MIN D16MIN Q8MIN
*/
/*
* S32MAX XRa, XRb, XRc
* Update XRa with the maximum of signed 32-bit integers contained
* in XRb and XRc.
*
* S32MIN XRa, XRb, XRc
* Update XRa with the minimum of signed 32-bit integers contained
* in XRb and XRc.
*/
static void gen_mxu_S32MAX_S32MIN(DisasContext *ctx)
{
uint32_t pad, opc, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
opc = extract32(ctx->opcode, 18, 3);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to zero */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely((XRb == 0) || (XRc == 0))) {
/* exactly one operand is zero register - find which one is not...*/
uint32_t XRx = XRb ? XRb : XRc;
/* ...and do max/min operation with one operand 0 */
if (opc == OPC_MXU_S32MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], mxu_gpr[XRx - 1], 0);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], mxu_gpr[XRx - 1], 0);
}
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to one of them */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
if (opc == OPC_MXU_S32MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1],
mxu_gpr[XRc - 1]);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1],
mxu_gpr[XRc - 1]);
}
}
}
/*
* D16MAX
* Update XRa with the 16-bit-wise maximums of signed integers
* contained in XRb and XRc.
*
* D16MIN
* Update XRa with the 16-bit-wise minimums of signed integers
* contained in XRb and XRc.
*/
static void gen_mxu_D16MAX_D16MIN(DisasContext *ctx)
{
uint32_t pad, opc, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
opc = extract32(ctx->opcode, 18, 3);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to zero */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely((XRb == 0) || (XRc == 0))) {
/* exactly one operand is zero register - find which one is not...*/
uint32_t XRx = XRb ? XRb : XRc;
/* ...and do half-word-wise max/min with one operand 0 */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_const_i32(0);
/* the left half-word first */
tcg_gen_andi_i32(t0, mxu_gpr[XRx - 1], 0xFFFF0000);
if (opc == OPC_MXU_D16MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], t0, t1);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], t0, t1);
}
/* the right half-word */
tcg_gen_andi_i32(t0, mxu_gpr[XRx - 1], 0x0000FFFF);
/* move half-words to the leftmost position */
tcg_gen_shli_i32(t0, t0, 16);
/* t0 will be max/min of t0 and t1 */
if (opc == OPC_MXU_D16MAX) {
tcg_gen_smax_i32(t0, t0, t1);
} else {
tcg_gen_smin_i32(t0, t0, t1);
}
/* return resulting half-words to its original position */
tcg_gen_shri_i32(t0, t0, 16);
/* finally update the destination */
tcg_gen_or_i32(mxu_gpr[XRa - 1], mxu_gpr[XRa - 1], t0);
tcg_temp_free(t1);
tcg_temp_free(t0);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to one of them */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new();
/* the left half-word first */
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0xFFFF0000);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFFFF0000);
if (opc == OPC_MXU_D16MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], t0, t1);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], t0, t1);
}
/* the right half-word */
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0x0000FFFF);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0x0000FFFF);
/* move half-words to the leftmost position */
tcg_gen_shli_i32(t0, t0, 16);
tcg_gen_shli_i32(t1, t1, 16);
/* t0 will be max/min of t0 and t1 */
if (opc == OPC_MXU_D16MAX) {
tcg_gen_smax_i32(t0, t0, t1);
} else {
tcg_gen_smin_i32(t0, t0, t1);
}
/* return resulting half-words to its original position */
tcg_gen_shri_i32(t0, t0, 16);
/* finally update the destination */
tcg_gen_or_i32(mxu_gpr[XRa - 1], mxu_gpr[XRa - 1], t0);
tcg_temp_free(t1);
tcg_temp_free(t0);
}
}
/*
* Q8MAX
* Update XRa with the 8-bit-wise maximums of signed integers
* contained in XRb and XRc.
*
* Q8MIN
* Update XRa with the 8-bit-wise minimums of signed integers
* contained in XRb and XRc.
*/
static void gen_mxu_Q8MAX_Q8MIN(DisasContext *ctx)
{
uint32_t pad, opc, XRc, XRb, XRa;
pad = extract32(ctx->opcode, 21, 5);
opc = extract32(ctx->opcode, 18, 3);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to zero */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely((XRb == 0) || (XRc == 0))) {
/* exactly one operand is zero register - make it be the first...*/
uint32_t XRx = XRb ? XRb : XRc;
/* ...and do byte-wise max/min with one operand 0 */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_const_i32(0);
int32_t i;
/* the leftmost byte (byte 3) first */
tcg_gen_andi_i32(t0, mxu_gpr[XRx - 1], 0xFF000000);
if (opc == OPC_MXU_Q8MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], t0, t1);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], t0, t1);
}
/* bytes 2, 1, 0 */
for (i = 2; i >= 0; i--) {
/* extract the byte */
tcg_gen_andi_i32(t0, mxu_gpr[XRx - 1], 0xFF << (8 * i));
/* move the byte to the leftmost position */
tcg_gen_shli_i32(t0, t0, 8 * (3 - i));
/* t0 will be max/min of t0 and t1 */
if (opc == OPC_MXU_Q8MAX) {
tcg_gen_smax_i32(t0, t0, t1);
} else {
tcg_gen_smin_i32(t0, t0, t1);
}
/* return resulting byte to its original position */
tcg_gen_shri_i32(t0, t0, 8 * (3 - i));
/* finally update the destination */
tcg_gen_or_i32(mxu_gpr[XRa - 1], mxu_gpr[XRa - 1], t0);
}
tcg_temp_free(t1);
tcg_temp_free(t0);
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just set destination to one of them */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
} else {
/* the most general case */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new();
int32_t i;
/* the leftmost bytes (bytes 3) first */
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0xFF000000);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFF000000);
if (opc == OPC_MXU_Q8MAX) {
tcg_gen_smax_i32(mxu_gpr[XRa - 1], t0, t1);
} else {
tcg_gen_smin_i32(mxu_gpr[XRa - 1], t0, t1);
}
/* bytes 2, 1, 0 */
for (i = 2; i >= 0; i--) {
/* extract corresponding bytes */
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0xFF << (8 * i));
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFF << (8 * i));
/* move the bytes to the leftmost position */
tcg_gen_shli_i32(t0, t0, 8 * (3 - i));
tcg_gen_shli_i32(t1, t1, 8 * (3 - i));
/* t0 will be max/min of t0 and t1 */
if (opc == OPC_MXU_Q8MAX) {
tcg_gen_smax_i32(t0, t0, t1);
} else {
tcg_gen_smin_i32(t0, t0, t1);
}
/* return resulting byte to its original position */
tcg_gen_shri_i32(t0, t0, 8 * (3 - i));
/* finally update the destination */
tcg_gen_or_i32(mxu_gpr[XRa - 1], mxu_gpr[XRa - 1], t0);
}
tcg_temp_free(t1);
tcg_temp_free(t0);
}
}
/*
* MXU instruction category: align
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* S32ALN S32ALNI
*/
/*
* S32ALNI XRc, XRb, XRa, optn3
* Arrange bytes from XRb and XRc according to one of five sets of
* rules determined by optn3, and place the result in XRa.
*/
static void gen_mxu_S32ALNI(DisasContext *ctx)
{
uint32_t optn3, pad, XRc, XRb, XRa;
optn3 = extract32(ctx->opcode, 23, 3);
pad = extract32(ctx->opcode, 21, 2);
XRc = extract32(ctx->opcode, 14, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRa = extract32(ctx->opcode, 6, 4);
if (unlikely(pad != 0)) {
/* opcode padding incorrect -> do nothing */
} else if (unlikely(XRa == 0)) {
/* destination is zero register -> do nothing */
} else if (unlikely((XRb == 0) && (XRc == 0))) {
/* both operands zero registers -> just set destination to all 0s */
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
} else if (unlikely(XRb == 0)) {
/* XRb zero register -> just appropriatelly shift XRc into XRa */
switch (optn3) {
case MXU_OPTN3_PTN0:
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
break;
case MXU_OPTN3_PTN1:
case MXU_OPTN3_PTN2:
case MXU_OPTN3_PTN3:
tcg_gen_shri_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1],
8 * (4 - optn3));
break;
case MXU_OPTN3_PTN4:
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1]);
break;
}
} else if (unlikely(XRc == 0)) {
/* XRc zero register -> just appropriatelly shift XRb into XRa */
switch (optn3) {
case MXU_OPTN3_PTN0:
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
break;
case MXU_OPTN3_PTN1:
case MXU_OPTN3_PTN2:
case MXU_OPTN3_PTN3:
tcg_gen_shri_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], 8 * optn3);
break;
case MXU_OPTN3_PTN4:
tcg_gen_movi_i32(mxu_gpr[XRa - 1], 0);
break;
}
} else if (unlikely(XRb == XRc)) {
/* both operands same -> just rotation or moving from any of them */
switch (optn3) {
case MXU_OPTN3_PTN0:
case MXU_OPTN3_PTN4:
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
break;
case MXU_OPTN3_PTN1:
case MXU_OPTN3_PTN2:
case MXU_OPTN3_PTN3:
tcg_gen_rotli_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1], 8 * optn3);
break;
}
} else {
/* the most general case */
switch (optn3) {
case MXU_OPTN3_PTN0:
{
/* */
/* XRb XRc */
/* +---------------+ */
/* | A B C D | E F G H */
/* +-------+-------+ */
/* | */
/* XRa */
/* */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRb - 1]);
}
break;
case MXU_OPTN3_PTN1:
{
/* */
/* XRb XRc */
/* +-------------------+ */
/* A | B C D E | F G H */
/* +---------+---------+ */
/* | */
/* XRa */
/* */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new();
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0x00FFFFFF);
tcg_gen_shli_i32(t0, t0, 8);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFF000000);
tcg_gen_shri_i32(t1, t1, 24);
tcg_gen_or_i32(mxu_gpr[XRa - 1], t0, t1);
tcg_temp_free(t1);
tcg_temp_free(t0);
}
break;
case MXU_OPTN3_PTN2:
{
/* */
/* XRb XRc */
/* +-------------------+ */
/* A B | C D E F | G H */
/* +---------+---------+ */
/* | */
/* XRa */
/* */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new();
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0x0000FFFF);
tcg_gen_shli_i32(t0, t0, 16);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFFFF0000);
tcg_gen_shri_i32(t1, t1, 16);
tcg_gen_or_i32(mxu_gpr[XRa - 1], t0, t1);
tcg_temp_free(t1);
tcg_temp_free(t0);
}
break;
case MXU_OPTN3_PTN3:
{
/* */
/* XRb XRc */
/* +-------------------+ */
/* A B C | D E F G | H */
/* +---------+---------+ */
/* | */
/* XRa */
/* */
TCGv_i32 t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new();
tcg_gen_andi_i32(t0, mxu_gpr[XRb - 1], 0x000000FF);
tcg_gen_shli_i32(t0, t0, 24);
tcg_gen_andi_i32(t1, mxu_gpr[XRc - 1], 0xFFFFFF00);
tcg_gen_shri_i32(t1, t1, 8);
tcg_gen_or_i32(mxu_gpr[XRa - 1], t0, t1);
tcg_temp_free(t1);
tcg_temp_free(t0);
}
break;
case MXU_OPTN3_PTN4:
{
/* */
/* XRb XRc */
/* +---------------+ */
/* A B C D | E F G H | */
/* +-------+-------+ */
/* | */
/* XRa */
/* */
tcg_gen_mov_i32(mxu_gpr[XRa - 1], mxu_gpr[XRc - 1]);
}
break;
}
}
}
/*
* Decoding engine for MXU
* =======================
*/
static void decode_opc_mxu__pool00(DisasContext *ctx)
{
uint32_t opcode = extract32(ctx->opcode, 18, 3);
switch (opcode) {
case OPC_MXU_S32MAX:
case OPC_MXU_S32MIN:
gen_mxu_S32MAX_S32MIN(ctx);
break;
case OPC_MXU_D16MAX:
case OPC_MXU_D16MIN:
gen_mxu_D16MAX_D16MIN(ctx);
break;
case OPC_MXU_Q8MAX:
case OPC_MXU_Q8MIN:
gen_mxu_Q8MAX_Q8MIN(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");
gen_reserved_instruction(ctx);
break;
}
}
static void decode_opc_mxu__pool04(DisasContext *ctx)
{
uint32_t opcode = extract32(ctx->opcode, 20, 1);
switch (opcode) {
case OPC_MXU_S32LDD:
case OPC_MXU_S32LDDR:
gen_mxu_s32ldd_s32lddr(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");
gen_reserved_instruction(ctx);
break;
}
}
static void decode_opc_mxu__pool16(DisasContext *ctx)
{
uint32_t opcode = extract32(ctx->opcode, 18, 3);
switch (opcode) {
case OPC_MXU_S32ALNI:
gen_mxu_S32ALNI(ctx);
break;
case OPC_MXU_S32NOR:
gen_mxu_S32NOR(ctx);
break;
case OPC_MXU_S32AND:
gen_mxu_S32AND(ctx);
break;
case OPC_MXU_S32OR:
gen_mxu_S32OR(ctx);
break;
case OPC_MXU_S32XOR:
gen_mxu_S32XOR(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");
gen_reserved_instruction(ctx);
break;
}
}
static void decode_opc_mxu__pool19(DisasContext *ctx)
{
uint32_t opcode = extract32(ctx->opcode, 22, 2);
switch (opcode) {
case OPC_MXU_Q8MUL:
case OPC_MXU_Q8MULSU:
gen_mxu_q8mul_q8mulsu(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");
gen_reserved_instruction(ctx);
break;
}
}
bool decode_ase_mxu(DisasContext *ctx, uint32_t insn)
{
uint32_t opcode = extract32(insn, 0, 6);
if (opcode == OPC_MXU_S32M2I) {
gen_mxu_s32m2i(ctx);
return true;
}
if (opcode == OPC_MXU_S32I2M) {
gen_mxu_s32i2m(ctx);
return true;
}
{
TCGv t_mxu_cr = tcg_temp_new();
TCGLabel *l_exit = gen_new_label();
gen_load_mxu_cr(t_mxu_cr);
tcg_gen_andi_tl(t_mxu_cr, t_mxu_cr, MXU_CR_MXU_EN);
tcg_gen_brcondi_tl(TCG_COND_NE, t_mxu_cr, MXU_CR_MXU_EN, l_exit);
switch (opcode) {
case OPC_MXU__POOL00:
decode_opc_mxu__pool00(ctx);
break;
case OPC_MXU_D16MUL:
gen_mxu_d16mul(ctx);
break;
case OPC_MXU_D16MAC:
gen_mxu_d16mac(ctx);
break;
case OPC_MXU__POOL04:
decode_opc_mxu__pool04(ctx);
break;
case OPC_MXU_S8LDD:
gen_mxu_s8ldd(ctx);
break;
case OPC_MXU__POOL16:
decode_opc_mxu__pool16(ctx);
break;
case OPC_MXU__POOL19:
decode_opc_mxu__pool19(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");
gen_reserved_instruction(ctx);
}
gen_set_label(l_exit);
tcg_temp_free(t_mxu_cr);
}
return true;
}
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