| /* |
| * Tiny Code Generator for QEMU |
| * |
| * Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org> |
| * Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net> |
| * Based on i386/tcg-target.c - Copyright (c) 2008 Fabrice Bellard |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "tcg-be-ldst.h" |
| |
| #ifdef HOST_WORDS_BIGENDIAN |
| # define MIPS_BE 1 |
| #else |
| # define MIPS_BE 0 |
| #endif |
| |
| #define LO_OFF (MIPS_BE * 4) |
| #define HI_OFF (4 - LO_OFF) |
| |
| #ifndef NDEBUG |
| static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = { |
| "zero", |
| "at", |
| "v0", |
| "v1", |
| "a0", |
| "a1", |
| "a2", |
| "a3", |
| "t0", |
| "t1", |
| "t2", |
| "t3", |
| "t4", |
| "t5", |
| "t6", |
| "t7", |
| "s0", |
| "s1", |
| "s2", |
| "s3", |
| "s4", |
| "s5", |
| "s6", |
| "s7", |
| "t8", |
| "t9", |
| "k0", |
| "k1", |
| "gp", |
| "sp", |
| "s8", |
| "ra", |
| }; |
| #endif |
| |
| #define TCG_TMP0 TCG_REG_AT |
| #define TCG_TMP1 TCG_REG_T9 |
| |
| /* check if we really need so many registers :P */ |
| static const TCGReg tcg_target_reg_alloc_order[] = { |
| /* Call saved registers. */ |
| TCG_REG_S0, |
| TCG_REG_S1, |
| TCG_REG_S2, |
| TCG_REG_S3, |
| TCG_REG_S4, |
| TCG_REG_S5, |
| TCG_REG_S6, |
| TCG_REG_S7, |
| TCG_REG_S8, |
| |
| /* Call clobbered registers. */ |
| TCG_REG_T0, |
| TCG_REG_T1, |
| TCG_REG_T2, |
| TCG_REG_T3, |
| TCG_REG_T4, |
| TCG_REG_T5, |
| TCG_REG_T6, |
| TCG_REG_T7, |
| TCG_REG_T8, |
| TCG_REG_T9, |
| TCG_REG_V1, |
| TCG_REG_V0, |
| |
| /* Argument registers, opposite order of allocation. */ |
| TCG_REG_A3, |
| TCG_REG_A2, |
| TCG_REG_A1, |
| TCG_REG_A0, |
| }; |
| |
| static const TCGReg tcg_target_call_iarg_regs[4] = { |
| TCG_REG_A0, |
| TCG_REG_A1, |
| TCG_REG_A2, |
| TCG_REG_A3 |
| }; |
| |
| static const TCGReg tcg_target_call_oarg_regs[2] = { |
| TCG_REG_V0, |
| TCG_REG_V1 |
| }; |
| |
| static tcg_insn_unit *tb_ret_addr; |
| |
| static inline uint32_t reloc_pc16_val(tcg_insn_unit *pc, tcg_insn_unit *target) |
| { |
| /* Let the compiler perform the right-shift as part of the arithmetic. */ |
| ptrdiff_t disp = target - (pc + 1); |
| assert(disp == (int16_t)disp); |
| return disp & 0xffff; |
| } |
| |
| static inline void reloc_pc16(tcg_insn_unit *pc, tcg_insn_unit *target) |
| { |
| *pc = deposit32(*pc, 0, 16, reloc_pc16_val(pc, target)); |
| } |
| |
| static inline uint32_t reloc_26_val(tcg_insn_unit *pc, tcg_insn_unit *target) |
| { |
| assert((((uintptr_t)pc ^ (uintptr_t)target) & 0xf0000000) == 0); |
| return ((uintptr_t)target >> 2) & 0x3ffffff; |
| } |
| |
| static inline void reloc_26(tcg_insn_unit *pc, tcg_insn_unit *target) |
| { |
| *pc = deposit32(*pc, 0, 26, reloc_26_val(pc, target)); |
| } |
| |
| static void patch_reloc(tcg_insn_unit *code_ptr, int type, |
| intptr_t value, intptr_t addend) |
| { |
| assert(type == R_MIPS_PC16); |
| assert(addend == 0); |
| reloc_pc16(code_ptr, (tcg_insn_unit *)value); |
| } |
| |
| #define TCG_CT_CONST_ZERO 0x100 |
| #define TCG_CT_CONST_U16 0x200 /* Unsigned 16-bit: 0 - 0xffff. */ |
| #define TCG_CT_CONST_S16 0x400 /* Signed 16-bit: -32768 - 32767 */ |
| #define TCG_CT_CONST_P2M1 0x800 /* Power of 2 minus 1. */ |
| #define TCG_CT_CONST_N16 0x1000 /* "Negatable" 16-bit: -32767 - 32767 */ |
| |
| static inline bool is_p2m1(tcg_target_long val) |
| { |
| return val && ((val + 1) & val) == 0; |
| } |
| |
| /* parse target specific constraints */ |
| static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str) |
| { |
| const char *ct_str; |
| |
| ct_str = *pct_str; |
| switch(ct_str[0]) { |
| case 'r': |
| ct->ct |= TCG_CT_REG; |
| tcg_regset_set(ct->u.regs, 0xffffffff); |
| break; |
| case 'L': /* qemu_ld output arg constraint */ |
| ct->ct |= TCG_CT_REG; |
| tcg_regset_set(ct->u.regs, 0xffffffff); |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_V0); |
| break; |
| case 'l': /* qemu_ld input arg constraint */ |
| ct->ct |= TCG_CT_REG; |
| tcg_regset_set(ct->u.regs, 0xffffffff); |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0); |
| #if defined(CONFIG_SOFTMMU) |
| if (TARGET_LONG_BITS == 64) { |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A2); |
| } |
| #endif |
| break; |
| case 'S': /* qemu_st constraint */ |
| ct->ct |= TCG_CT_REG; |
| tcg_regset_set(ct->u.regs, 0xffffffff); |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0); |
| #if defined(CONFIG_SOFTMMU) |
| if (TARGET_LONG_BITS == 32) { |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A1); |
| } else { |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A2); |
| tcg_regset_reset_reg(ct->u.regs, TCG_REG_A3); |
| } |
| #endif |
| break; |
| case 'I': |
| ct->ct |= TCG_CT_CONST_U16; |
| break; |
| case 'J': |
| ct->ct |= TCG_CT_CONST_S16; |
| break; |
| case 'K': |
| ct->ct |= TCG_CT_CONST_P2M1; |
| break; |
| case 'N': |
| ct->ct |= TCG_CT_CONST_N16; |
| break; |
| case 'Z': |
| /* We are cheating a bit here, using the fact that the register |
| ZERO is also the register number 0. Hence there is no need |
| to check for const_args in each instruction. */ |
| ct->ct |= TCG_CT_CONST_ZERO; |
| break; |
| default: |
| return -1; |
| } |
| ct_str++; |
| *pct_str = ct_str; |
| return 0; |
| } |
| |
| /* test if a constant matches the constraint */ |
| static inline int tcg_target_const_match(tcg_target_long val, TCGType type, |
| const TCGArgConstraint *arg_ct) |
| { |
| int ct; |
| ct = arg_ct->ct; |
| if (ct & TCG_CT_CONST) { |
| return 1; |
| } else if ((ct & TCG_CT_CONST_ZERO) && val == 0) { |
| return 1; |
| } else if ((ct & TCG_CT_CONST_U16) && val == (uint16_t)val) { |
| return 1; |
| } else if ((ct & TCG_CT_CONST_S16) && val == (int16_t)val) { |
| return 1; |
| } else if ((ct & TCG_CT_CONST_N16) && val >= -32767 && val <= 32767) { |
| return 1; |
| } else if ((ct & TCG_CT_CONST_P2M1) |
| && use_mips32r2_instructions && is_p2m1(val)) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* instruction opcodes */ |
| typedef enum { |
| OPC_J = 0x02 << 26, |
| OPC_JAL = 0x03 << 26, |
| OPC_BEQ = 0x04 << 26, |
| OPC_BNE = 0x05 << 26, |
| OPC_BLEZ = 0x06 << 26, |
| OPC_BGTZ = 0x07 << 26, |
| OPC_ADDIU = 0x09 << 26, |
| OPC_SLTI = 0x0A << 26, |
| OPC_SLTIU = 0x0B << 26, |
| OPC_ANDI = 0x0C << 26, |
| OPC_ORI = 0x0D << 26, |
| OPC_XORI = 0x0E << 26, |
| OPC_LUI = 0x0F << 26, |
| OPC_LB = 0x20 << 26, |
| OPC_LH = 0x21 << 26, |
| OPC_LW = 0x23 << 26, |
| OPC_LBU = 0x24 << 26, |
| OPC_LHU = 0x25 << 26, |
| OPC_LWU = 0x27 << 26, |
| OPC_SB = 0x28 << 26, |
| OPC_SH = 0x29 << 26, |
| OPC_SW = 0x2B << 26, |
| |
| OPC_SPECIAL = 0x00 << 26, |
| OPC_SLL = OPC_SPECIAL | 0x00, |
| OPC_SRL = OPC_SPECIAL | 0x02, |
| OPC_ROTR = OPC_SPECIAL | (0x01 << 21) | 0x02, |
| OPC_SRA = OPC_SPECIAL | 0x03, |
| OPC_SLLV = OPC_SPECIAL | 0x04, |
| OPC_SRLV = OPC_SPECIAL | 0x06, |
| OPC_ROTRV = OPC_SPECIAL | (0x01 << 6) | 0x06, |
| OPC_SRAV = OPC_SPECIAL | 0x07, |
| OPC_JR_R5 = OPC_SPECIAL | 0x08, |
| OPC_JALR = OPC_SPECIAL | 0x09, |
| OPC_MOVZ = OPC_SPECIAL | 0x0A, |
| OPC_MOVN = OPC_SPECIAL | 0x0B, |
| OPC_MFHI = OPC_SPECIAL | 0x10, |
| OPC_MFLO = OPC_SPECIAL | 0x12, |
| OPC_MULT = OPC_SPECIAL | 0x18, |
| OPC_MUL_R6 = OPC_SPECIAL | (0x02 << 6) | 0x18, |
| OPC_MUH = OPC_SPECIAL | (0x03 << 6) | 0x18, |
| OPC_MULTU = OPC_SPECIAL | 0x19, |
| OPC_MULU = OPC_SPECIAL | (0x02 << 6) | 0x19, |
| OPC_MUHU = OPC_SPECIAL | (0x03 << 6) | 0x19, |
| OPC_DIV = OPC_SPECIAL | 0x1A, |
| OPC_DIV_R6 = OPC_SPECIAL | (0x02 << 6) | 0x1A, |
| OPC_MOD = OPC_SPECIAL | (0x03 << 6) | 0x1A, |
| OPC_DIVU = OPC_SPECIAL | 0x1B, |
| OPC_DIVU_R6 = OPC_SPECIAL | (0x02 << 6) | 0x1B, |
| OPC_MODU = OPC_SPECIAL | (0x03 << 6) | 0x1B, |
| OPC_ADDU = OPC_SPECIAL | 0x21, |
| OPC_SUBU = OPC_SPECIAL | 0x23, |
| OPC_AND = OPC_SPECIAL | 0x24, |
| OPC_OR = OPC_SPECIAL | 0x25, |
| OPC_XOR = OPC_SPECIAL | 0x26, |
| OPC_NOR = OPC_SPECIAL | 0x27, |
| OPC_SLT = OPC_SPECIAL | 0x2A, |
| OPC_SLTU = OPC_SPECIAL | 0x2B, |
| |
| OPC_REGIMM = 0x01 << 26, |
| OPC_BLTZ = OPC_REGIMM | (0x00 << 16), |
| OPC_BGEZ = OPC_REGIMM | (0x01 << 16), |
| |
| OPC_SPECIAL2 = 0x1c << 26, |
| OPC_MUL_R5 = OPC_SPECIAL2 | 0x002, |
| |
| OPC_SPECIAL3 = 0x1f << 26, |
| OPC_EXT = OPC_SPECIAL3 | 0x000, |
| OPC_INS = OPC_SPECIAL3 | 0x004, |
| OPC_WSBH = OPC_SPECIAL3 | 0x0a0, |
| OPC_SEB = OPC_SPECIAL3 | 0x420, |
| OPC_SEH = OPC_SPECIAL3 | 0x620, |
| |
| /* MIPS r6 doesn't have JR, JALR should be used instead */ |
| OPC_JR = use_mips32r6_instructions ? OPC_JALR : OPC_JR_R5, |
| |
| /* |
| * MIPS r6 replaces MUL with an alternative encoding which is |
| * backwards-compatible at the assembly level. |
| */ |
| OPC_MUL = use_mips32r6_instructions ? OPC_MUL_R6 : OPC_MUL_R5, |
| } MIPSInsn; |
| |
| /* |
| * Type reg |
| */ |
| static inline void tcg_out_opc_reg(TCGContext *s, MIPSInsn opc, |
| TCGReg rd, TCGReg rs, TCGReg rt) |
| { |
| int32_t inst; |
| |
| inst = opc; |
| inst |= (rs & 0x1F) << 21; |
| inst |= (rt & 0x1F) << 16; |
| inst |= (rd & 0x1F) << 11; |
| tcg_out32(s, inst); |
| } |
| |
| /* |
| * Type immediate |
| */ |
| static inline void tcg_out_opc_imm(TCGContext *s, MIPSInsn opc, |
| TCGReg rt, TCGReg rs, TCGArg imm) |
| { |
| int32_t inst; |
| |
| inst = opc; |
| inst |= (rs & 0x1F) << 21; |
| inst |= (rt & 0x1F) << 16; |
| inst |= (imm & 0xffff); |
| tcg_out32(s, inst); |
| } |
| |
| /* |
| * Type bitfield |
| */ |
| static inline void tcg_out_opc_bf(TCGContext *s, MIPSInsn opc, TCGReg rt, |
| TCGReg rs, int msb, int lsb) |
| { |
| int32_t inst; |
| |
| inst = opc; |
| inst |= (rs & 0x1F) << 21; |
| inst |= (rt & 0x1F) << 16; |
| inst |= (msb & 0x1F) << 11; |
| inst |= (lsb & 0x1F) << 6; |
| tcg_out32(s, inst); |
| } |
| |
| /* |
| * Type branch |
| */ |
| static inline void tcg_out_opc_br(TCGContext *s, MIPSInsn opc, |
| TCGReg rt, TCGReg rs) |
| { |
| /* We pay attention here to not modify the branch target by reading |
| the existing value and using it again. This ensure that caches and |
| memory are kept coherent during retranslation. */ |
| uint16_t offset = (uint16_t)*s->code_ptr; |
| |
| tcg_out_opc_imm(s, opc, rt, rs, offset); |
| } |
| |
| /* |
| * Type sa |
| */ |
| static inline void tcg_out_opc_sa(TCGContext *s, MIPSInsn opc, |
| TCGReg rd, TCGReg rt, TCGArg sa) |
| { |
| int32_t inst; |
| |
| inst = opc; |
| inst |= (rt & 0x1F) << 16; |
| inst |= (rd & 0x1F) << 11; |
| inst |= (sa & 0x1F) << 6; |
| tcg_out32(s, inst); |
| |
| } |
| |
| /* |
| * Type jump. |
| * Returns true if the branch was in range and the insn was emitted. |
| */ |
| static bool tcg_out_opc_jmp(TCGContext *s, MIPSInsn opc, void *target) |
| { |
| uintptr_t dest = (uintptr_t)target; |
| uintptr_t from = (uintptr_t)s->code_ptr + 4; |
| int32_t inst; |
| |
| /* The pc-region branch happens within the 256MB region of |
| the delay slot (thus the +4). */ |
| if ((from ^ dest) & -(1 << 28)) { |
| return false; |
| } |
| assert((dest & 3) == 0); |
| |
| inst = opc; |
| inst |= (dest >> 2) & 0x3ffffff; |
| tcg_out32(s, inst); |
| return true; |
| } |
| |
| static inline void tcg_out_nop(TCGContext *s) |
| { |
| tcg_out32(s, 0); |
| } |
| |
| static inline void tcg_out_mov(TCGContext *s, TCGType type, |
| TCGReg ret, TCGReg arg) |
| { |
| /* Simple reg-reg move, optimising out the 'do nothing' case */ |
| if (ret != arg) { |
| tcg_out_opc_reg(s, OPC_ADDU, ret, arg, TCG_REG_ZERO); |
| } |
| } |
| |
| static inline void tcg_out_movi(TCGContext *s, TCGType type, |
| TCGReg reg, tcg_target_long arg) |
| { |
| if (arg == (int16_t)arg) { |
| tcg_out_opc_imm(s, OPC_ADDIU, reg, TCG_REG_ZERO, arg); |
| } else if (arg == (uint16_t)arg) { |
| tcg_out_opc_imm(s, OPC_ORI, reg, TCG_REG_ZERO, arg); |
| } else { |
| tcg_out_opc_imm(s, OPC_LUI, reg, TCG_REG_ZERO, arg >> 16); |
| if (arg & 0xffff) { |
| tcg_out_opc_imm(s, OPC_ORI, reg, reg, arg & 0xffff); |
| } |
| } |
| } |
| |
| static inline void tcg_out_bswap16(TCGContext *s, TCGReg ret, TCGReg arg) |
| { |
| if (use_mips32r2_instructions) { |
| tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg); |
| } else { |
| /* ret and arg can't be register at */ |
| if (ret == TCG_TMP0 || arg == TCG_TMP0) { |
| tcg_abort(); |
| } |
| |
| tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8); |
| tcg_out_opc_sa(s, OPC_SLL, ret, arg, 8); |
| tcg_out_opc_imm(s, OPC_ANDI, ret, ret, 0xff00); |
| tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0); |
| } |
| } |
| |
| static inline void tcg_out_bswap16s(TCGContext *s, TCGReg ret, TCGReg arg) |
| { |
| if (use_mips32r2_instructions) { |
| tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg); |
| tcg_out_opc_reg(s, OPC_SEH, ret, 0, ret); |
| } else { |
| /* ret and arg can't be register at */ |
| if (ret == TCG_TMP0 || arg == TCG_TMP0) { |
| tcg_abort(); |
| } |
| |
| tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8); |
| tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24); |
| tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16); |
| tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0); |
| } |
| } |
| |
| static inline void tcg_out_bswap32(TCGContext *s, TCGReg ret, TCGReg arg) |
| { |
| if (use_mips32r2_instructions) { |
| tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg); |
| tcg_out_opc_sa(s, OPC_ROTR, ret, ret, 16); |
| } else { |
| /* ret and arg must be different and can't be register at */ |
| if (ret == arg || ret == TCG_TMP0 || arg == TCG_TMP0) { |
| tcg_abort(); |
| } |
| |
| tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24); |
| |
| tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 24); |
| tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0); |
| |
| tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP0, arg, 0xff00); |
| tcg_out_opc_sa(s, OPC_SLL, TCG_TMP0, TCG_TMP0, 8); |
| tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0); |
| |
| tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8); |
| tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP0, TCG_TMP0, 0xff00); |
| tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0); |
| } |
| } |
| |
| static inline void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg) |
| { |
| if (use_mips32r2_instructions) { |
| tcg_out_opc_reg(s, OPC_SEB, ret, 0, arg); |
| } else { |
| tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24); |
| tcg_out_opc_sa(s, OPC_SRA, ret, ret, 24); |
| } |
| } |
| |
| static inline void tcg_out_ext16s(TCGContext *s, TCGReg ret, TCGReg arg) |
| { |
| if (use_mips32r2_instructions) { |
| tcg_out_opc_reg(s, OPC_SEH, ret, 0, arg); |
| } else { |
| tcg_out_opc_sa(s, OPC_SLL, ret, arg, 16); |
| tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16); |
| } |
| } |
| |
| static void tcg_out_ldst(TCGContext *s, MIPSInsn opc, TCGReg data, |
| TCGReg addr, intptr_t ofs) |
| { |
| int16_t lo = ofs; |
| if (ofs != lo) { |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, ofs - lo); |
| if (addr != TCG_REG_ZERO) { |
| tcg_out_opc_reg(s, OPC_ADDU, TCG_TMP0, TCG_TMP0, addr); |
| } |
| addr = TCG_TMP0; |
| } |
| tcg_out_opc_imm(s, opc, data, addr, lo); |
| } |
| |
| static inline void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg, |
| TCGReg arg1, intptr_t arg2) |
| { |
| tcg_out_ldst(s, OPC_LW, arg, arg1, arg2); |
| } |
| |
| static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, |
| TCGReg arg1, intptr_t arg2) |
| { |
| tcg_out_ldst(s, OPC_SW, arg, arg1, arg2); |
| } |
| |
| static inline void tcg_out_addi(TCGContext *s, TCGReg reg, TCGArg val) |
| { |
| if (val == (int16_t)val) { |
| tcg_out_opc_imm(s, OPC_ADDIU, reg, reg, val); |
| } else { |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, val); |
| tcg_out_opc_reg(s, OPC_ADDU, reg, reg, TCG_TMP0); |
| } |
| } |
| |
| static void tcg_out_addsub2(TCGContext *s, TCGReg rl, TCGReg rh, TCGReg al, |
| TCGReg ah, TCGArg bl, TCGArg bh, bool cbl, |
| bool cbh, bool is_sub) |
| { |
| TCGReg th = TCG_TMP1; |
| |
| /* If we have a negative constant such that negating it would |
| make the high part zero, we can (usually) eliminate one insn. */ |
| if (cbl && cbh && bh == -1 && bl != 0) { |
| bl = -bl; |
| bh = 0; |
| is_sub = !is_sub; |
| } |
| |
| /* By operating on the high part first, we get to use the final |
| carry operation to move back from the temporary. */ |
| if (!cbh) { |
| tcg_out_opc_reg(s, (is_sub ? OPC_SUBU : OPC_ADDU), th, ah, bh); |
| } else if (bh != 0 || ah == rl) { |
| tcg_out_opc_imm(s, OPC_ADDIU, th, ah, (is_sub ? -bh : bh)); |
| } else { |
| th = ah; |
| } |
| |
| /* Note that tcg optimization should eliminate the bl == 0 case. */ |
| if (is_sub) { |
| if (cbl) { |
| tcg_out_opc_imm(s, OPC_SLTIU, TCG_TMP0, al, bl); |
| tcg_out_opc_imm(s, OPC_ADDIU, rl, al, -bl); |
| } else { |
| tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, al, bl); |
| tcg_out_opc_reg(s, OPC_SUBU, rl, al, bl); |
| } |
| tcg_out_opc_reg(s, OPC_SUBU, rh, th, TCG_TMP0); |
| } else { |
| if (cbl) { |
| tcg_out_opc_imm(s, OPC_ADDIU, rl, al, bl); |
| tcg_out_opc_imm(s, OPC_SLTIU, TCG_TMP0, rl, bl); |
| } else if (rl == al && rl == bl) { |
| tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, al, 31); |
| tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl); |
| } else { |
| tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl); |
| tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, rl, (rl == bl ? al : bl)); |
| } |
| tcg_out_opc_reg(s, OPC_ADDU, rh, th, TCG_TMP0); |
| } |
| } |
| |
| /* Bit 0 set if inversion required; bit 1 set if swapping required. */ |
| #define MIPS_CMP_INV 1 |
| #define MIPS_CMP_SWAP 2 |
| |
| static const uint8_t mips_cmp_map[16] = { |
| [TCG_COND_LT] = 0, |
| [TCG_COND_LTU] = 0, |
| [TCG_COND_GE] = MIPS_CMP_INV, |
| [TCG_COND_GEU] = MIPS_CMP_INV, |
| [TCG_COND_LE] = MIPS_CMP_INV | MIPS_CMP_SWAP, |
| [TCG_COND_LEU] = MIPS_CMP_INV | MIPS_CMP_SWAP, |
| [TCG_COND_GT] = MIPS_CMP_SWAP, |
| [TCG_COND_GTU] = MIPS_CMP_SWAP, |
| }; |
| |
| static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret, |
| TCGReg arg1, TCGReg arg2) |
| { |
| MIPSInsn s_opc = OPC_SLTU; |
| int cmp_map; |
| |
| switch (cond) { |
| case TCG_COND_EQ: |
| if (arg2 != 0) { |
| tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2); |
| arg1 = ret; |
| } |
| tcg_out_opc_imm(s, OPC_SLTIU, ret, arg1, 1); |
| break; |
| |
| case TCG_COND_NE: |
| if (arg2 != 0) { |
| tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2); |
| arg1 = ret; |
| } |
| tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, arg1); |
| break; |
| |
| case TCG_COND_LT: |
| case TCG_COND_GE: |
| case TCG_COND_LE: |
| case TCG_COND_GT: |
| s_opc = OPC_SLT; |
| /* FALLTHRU */ |
| |
| case TCG_COND_LTU: |
| case TCG_COND_GEU: |
| case TCG_COND_LEU: |
| case TCG_COND_GTU: |
| cmp_map = mips_cmp_map[cond]; |
| if (cmp_map & MIPS_CMP_SWAP) { |
| TCGReg t = arg1; |
| arg1 = arg2; |
| arg2 = t; |
| } |
| tcg_out_opc_reg(s, s_opc, ret, arg1, arg2); |
| if (cmp_map & MIPS_CMP_INV) { |
| tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1); |
| } |
| break; |
| |
| default: |
| tcg_abort(); |
| break; |
| } |
| } |
| |
| static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1, |
| TCGReg arg2, TCGLabel *l) |
| { |
| static const MIPSInsn b_zero[16] = { |
| [TCG_COND_LT] = OPC_BLTZ, |
| [TCG_COND_GT] = OPC_BGTZ, |
| [TCG_COND_LE] = OPC_BLEZ, |
| [TCG_COND_GE] = OPC_BGEZ, |
| }; |
| |
| MIPSInsn s_opc = OPC_SLTU; |
| MIPSInsn b_opc; |
| int cmp_map; |
| |
| switch (cond) { |
| case TCG_COND_EQ: |
| b_opc = OPC_BEQ; |
| break; |
| case TCG_COND_NE: |
| b_opc = OPC_BNE; |
| break; |
| |
| case TCG_COND_LT: |
| case TCG_COND_GT: |
| case TCG_COND_LE: |
| case TCG_COND_GE: |
| if (arg2 == 0) { |
| b_opc = b_zero[cond]; |
| arg2 = arg1; |
| arg1 = 0; |
| break; |
| } |
| s_opc = OPC_SLT; |
| /* FALLTHRU */ |
| |
| case TCG_COND_LTU: |
| case TCG_COND_GTU: |
| case TCG_COND_LEU: |
| case TCG_COND_GEU: |
| cmp_map = mips_cmp_map[cond]; |
| if (cmp_map & MIPS_CMP_SWAP) { |
| TCGReg t = arg1; |
| arg1 = arg2; |
| arg2 = t; |
| } |
| tcg_out_opc_reg(s, s_opc, TCG_TMP0, arg1, arg2); |
| b_opc = (cmp_map & MIPS_CMP_INV ? OPC_BEQ : OPC_BNE); |
| arg1 = TCG_TMP0; |
| arg2 = TCG_REG_ZERO; |
| break; |
| |
| default: |
| tcg_abort(); |
| break; |
| } |
| |
| tcg_out_opc_br(s, b_opc, arg1, arg2); |
| if (l->has_value) { |
| reloc_pc16(s->code_ptr - 1, l->u.value_ptr); |
| } else { |
| tcg_out_reloc(s, s->code_ptr - 1, R_MIPS_PC16, l, 0); |
| } |
| tcg_out_nop(s); |
| } |
| |
| static TCGReg tcg_out_reduce_eq2(TCGContext *s, TCGReg tmp0, TCGReg tmp1, |
| TCGReg al, TCGReg ah, |
| TCGReg bl, TCGReg bh) |
| { |
| /* Merge highpart comparison into AH. */ |
| if (bh != 0) { |
| if (ah != 0) { |
| tcg_out_opc_reg(s, OPC_XOR, tmp0, ah, bh); |
| ah = tmp0; |
| } else { |
| ah = bh; |
| } |
| } |
| /* Merge lowpart comparison into AL. */ |
| if (bl != 0) { |
| if (al != 0) { |
| tcg_out_opc_reg(s, OPC_XOR, tmp1, al, bl); |
| al = tmp1; |
| } else { |
| al = bl; |
| } |
| } |
| /* Merge high and low part comparisons into AL. */ |
| if (ah != 0) { |
| if (al != 0) { |
| tcg_out_opc_reg(s, OPC_OR, tmp0, ah, al); |
| al = tmp0; |
| } else { |
| al = ah; |
| } |
| } |
| return al; |
| } |
| |
| static void tcg_out_setcond2(TCGContext *s, TCGCond cond, TCGReg ret, |
| TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh) |
| { |
| TCGReg tmp0 = TCG_TMP0; |
| TCGReg tmp1 = ret; |
| |
| assert(ret != TCG_TMP0); |
| if (ret == ah || ret == bh) { |
| assert(ret != TCG_TMP1); |
| tmp1 = TCG_TMP1; |
| } |
| |
| switch (cond) { |
| case TCG_COND_EQ: |
| case TCG_COND_NE: |
| tmp1 = tcg_out_reduce_eq2(s, tmp0, tmp1, al, ah, bl, bh); |
| tcg_out_setcond(s, cond, ret, tmp1, TCG_REG_ZERO); |
| break; |
| |
| default: |
| tcg_out_setcond(s, TCG_COND_EQ, tmp0, ah, bh); |
| tcg_out_setcond(s, tcg_unsigned_cond(cond), tmp1, al, bl); |
| tcg_out_opc_reg(s, OPC_AND, tmp1, tmp1, tmp0); |
| tcg_out_setcond(s, tcg_high_cond(cond), tmp0, ah, bh); |
| tcg_out_opc_reg(s, OPC_OR, ret, tmp1, tmp0); |
| break; |
| } |
| } |
| |
| static void tcg_out_brcond2(TCGContext *s, TCGCond cond, TCGReg al, TCGReg ah, |
| TCGReg bl, TCGReg bh, TCGLabel *l) |
| { |
| TCGCond b_cond = TCG_COND_NE; |
| TCGReg tmp = TCG_TMP1; |
| |
| /* With branches, we emit between 4 and 9 insns with 2 or 3 branches. |
| With setcond, we emit between 3 and 10 insns and only 1 branch, |
| which ought to get better branch prediction. */ |
| switch (cond) { |
| case TCG_COND_EQ: |
| case TCG_COND_NE: |
| b_cond = cond; |
| tmp = tcg_out_reduce_eq2(s, TCG_TMP0, TCG_TMP1, al, ah, bl, bh); |
| break; |
| |
| default: |
| /* Minimize code size by preferring a compare not requiring INV. */ |
| if (mips_cmp_map[cond] & MIPS_CMP_INV) { |
| cond = tcg_invert_cond(cond); |
| b_cond = TCG_COND_EQ; |
| } |
| tcg_out_setcond2(s, cond, tmp, al, ah, bl, bh); |
| break; |
| } |
| |
| tcg_out_brcond(s, b_cond, tmp, TCG_REG_ZERO, l); |
| } |
| |
| static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret, |
| TCGReg c1, TCGReg c2, TCGReg v) |
| { |
| MIPSInsn m_opc = OPC_MOVN; |
| |
| switch (cond) { |
| case TCG_COND_EQ: |
| m_opc = OPC_MOVZ; |
| /* FALLTHRU */ |
| case TCG_COND_NE: |
| if (c2 != 0) { |
| tcg_out_opc_reg(s, OPC_XOR, TCG_TMP0, c1, c2); |
| c1 = TCG_TMP0; |
| } |
| break; |
| |
| default: |
| /* Minimize code size by preferring a compare not requiring INV. */ |
| if (mips_cmp_map[cond] & MIPS_CMP_INV) { |
| cond = tcg_invert_cond(cond); |
| m_opc = OPC_MOVZ; |
| } |
| tcg_out_setcond(s, cond, TCG_TMP0, c1, c2); |
| c1 = TCG_TMP0; |
| break; |
| } |
| |
| tcg_out_opc_reg(s, m_opc, ret, v, c1); |
| } |
| |
| static void tcg_out_call_int(TCGContext *s, tcg_insn_unit *arg, bool tail) |
| { |
| /* Note that the ABI requires the called function's address to be |
| loaded into T9, even if a direct branch is in range. */ |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_T9, (uintptr_t)arg); |
| |
| /* But do try a direct branch, allowing the cpu better insn prefetch. */ |
| if (tail) { |
| if (!tcg_out_opc_jmp(s, OPC_J, arg)) { |
| tcg_out_opc_reg(s, OPC_JR, 0, TCG_REG_T9, 0); |
| } |
| } else { |
| if (!tcg_out_opc_jmp(s, OPC_JAL, arg)) { |
| tcg_out_opc_reg(s, OPC_JALR, TCG_REG_RA, TCG_REG_T9, 0); |
| } |
| } |
| } |
| |
| static void tcg_out_call(TCGContext *s, tcg_insn_unit *arg) |
| { |
| tcg_out_call_int(s, arg, false); |
| tcg_out_nop(s); |
| } |
| |
| #if defined(CONFIG_SOFTMMU) |
| static void * const qemu_ld_helpers[16] = { |
| [MO_UB] = helper_ret_ldub_mmu, |
| [MO_SB] = helper_ret_ldsb_mmu, |
| [MO_LEUW] = helper_le_lduw_mmu, |
| [MO_LESW] = helper_le_ldsw_mmu, |
| [MO_LEUL] = helper_le_ldul_mmu, |
| [MO_LEQ] = helper_le_ldq_mmu, |
| [MO_BEUW] = helper_be_lduw_mmu, |
| [MO_BESW] = helper_be_ldsw_mmu, |
| [MO_BEUL] = helper_be_ldul_mmu, |
| [MO_BEQ] = helper_be_ldq_mmu, |
| }; |
| |
| static void * const qemu_st_helpers[16] = { |
| [MO_UB] = helper_ret_stb_mmu, |
| [MO_LEUW] = helper_le_stw_mmu, |
| [MO_LEUL] = helper_le_stl_mmu, |
| [MO_LEQ] = helper_le_stq_mmu, |
| [MO_BEUW] = helper_be_stw_mmu, |
| [MO_BEUL] = helper_be_stl_mmu, |
| [MO_BEQ] = helper_be_stq_mmu, |
| }; |
| |
| /* Helper routines for marshalling helper function arguments into |
| * the correct registers and stack. |
| * I is where we want to put this argument, and is updated and returned |
| * for the next call. ARG is the argument itself. |
| * |
| * We provide routines for arguments which are: immediate, 32 bit |
| * value in register, 16 and 8 bit values in register (which must be zero |
| * extended before use) and 64 bit value in a lo:hi register pair. |
| */ |
| |
| static int tcg_out_call_iarg_reg(TCGContext *s, int i, TCGReg arg) |
| { |
| if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) { |
| tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[i], arg); |
| } else { |
| tcg_out_st(s, TCG_TYPE_REG, arg, TCG_REG_SP, 4 * i); |
| } |
| return i + 1; |
| } |
| |
| static int tcg_out_call_iarg_reg8(TCGContext *s, int i, TCGReg arg) |
| { |
| TCGReg tmp = TCG_TMP0; |
| if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) { |
| tmp = tcg_target_call_iarg_regs[i]; |
| } |
| tcg_out_opc_imm(s, OPC_ANDI, tmp, arg, 0xff); |
| return tcg_out_call_iarg_reg(s, i, tmp); |
| } |
| |
| static int tcg_out_call_iarg_reg16(TCGContext *s, int i, TCGReg arg) |
| { |
| TCGReg tmp = TCG_TMP0; |
| if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) { |
| tmp = tcg_target_call_iarg_regs[i]; |
| } |
| tcg_out_opc_imm(s, OPC_ANDI, tmp, arg, 0xffff); |
| return tcg_out_call_iarg_reg(s, i, tmp); |
| } |
| |
| static int tcg_out_call_iarg_imm(TCGContext *s, int i, TCGArg arg) |
| { |
| TCGReg tmp = TCG_TMP0; |
| if (arg == 0) { |
| tmp = TCG_REG_ZERO; |
| } else { |
| if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) { |
| tmp = tcg_target_call_iarg_regs[i]; |
| } |
| tcg_out_movi(s, TCG_TYPE_REG, tmp, arg); |
| } |
| return tcg_out_call_iarg_reg(s, i, tmp); |
| } |
| |
| static int tcg_out_call_iarg_reg2(TCGContext *s, int i, TCGReg al, TCGReg ah) |
| { |
| i = (i + 1) & ~1; |
| i = tcg_out_call_iarg_reg(s, i, (MIPS_BE ? ah : al)); |
| i = tcg_out_call_iarg_reg(s, i, (MIPS_BE ? al : ah)); |
| return i; |
| } |
| |
| /* Perform the tlb comparison operation. The complete host address is |
| placed in BASE. Clobbers AT, T0, A0. */ |
| static void tcg_out_tlb_load(TCGContext *s, TCGReg base, TCGReg addrl, |
| TCGReg addrh, TCGMemOpIdx oi, |
| tcg_insn_unit *label_ptr[2], bool is_load) |
| { |
| TCGMemOp s_bits = get_memop(oi) & MO_SIZE; |
| int mem_index = get_mmuidx(oi); |
| int cmp_off |
| = (is_load |
| ? offsetof(CPUArchState, tlb_table[mem_index][0].addr_read) |
| : offsetof(CPUArchState, tlb_table[mem_index][0].addr_write)); |
| int add_off = offsetof(CPUArchState, tlb_table[mem_index][0].addend); |
| |
| tcg_out_opc_sa(s, OPC_SRL, TCG_REG_A0, addrl, |
| TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS); |
| tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_A0, TCG_REG_A0, |
| (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS); |
| tcg_out_opc_reg(s, OPC_ADDU, TCG_REG_A0, TCG_REG_A0, TCG_AREG0); |
| |
| /* Compensate for very large offsets. */ |
| if (add_off >= 0x8000) { |
| /* Most target env are smaller than 32k; none are larger than 64k. |
| Simplify the logic here merely to offset by 0x7ff0, giving us a |
| range just shy of 64k. Check this assumption. */ |
| QEMU_BUILD_BUG_ON(offsetof(CPUArchState, |
| tlb_table[NB_MMU_MODES - 1][1]) |
| > 0x7ff0 + 0x7fff); |
| tcg_out_opc_imm(s, OPC_ADDIU, TCG_REG_A0, TCG_REG_A0, 0x7ff0); |
| cmp_off -= 0x7ff0; |
| add_off -= 0x7ff0; |
| } |
| |
| /* Load the (low half) tlb comparator. */ |
| tcg_out_opc_imm(s, OPC_LW, TCG_TMP0, TCG_REG_A0, |
| cmp_off + (TARGET_LONG_BITS == 64 ? LO_OFF : 0)); |
| |
| /* Mask the page bits, keeping the alignment bits to compare against. |
| In between on 32-bit targets, load the tlb addend for the fast path. */ |
| tcg_out_movi(s, TCG_TYPE_I32, TCG_TMP1, |
| TARGET_PAGE_MASK | ((1 << s_bits) - 1)); |
| if (TARGET_LONG_BITS == 32) { |
| tcg_out_opc_imm(s, OPC_LW, TCG_REG_A0, TCG_REG_A0, add_off); |
| } |
| tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, addrl); |
| |
| label_ptr[0] = s->code_ptr; |
| tcg_out_opc_br(s, OPC_BNE, TCG_TMP1, TCG_TMP0); |
| |
| /* Load and test the high half tlb comparator. */ |
| if (TARGET_LONG_BITS == 64) { |
| /* delay slot */ |
| tcg_out_opc_imm(s, OPC_LW, TCG_TMP0, TCG_REG_A0, cmp_off + HI_OFF); |
| |
| /* Load the tlb addend for the fast path. We can't do it earlier with |
| 64-bit targets or we'll clobber a0 before reading the high half tlb |
| comparator. */ |
| tcg_out_opc_imm(s, OPC_LW, TCG_REG_A0, TCG_REG_A0, add_off); |
| |
| label_ptr[1] = s->code_ptr; |
| tcg_out_opc_br(s, OPC_BNE, addrh, TCG_TMP0); |
| } |
| |
| /* delay slot */ |
| tcg_out_opc_reg(s, OPC_ADDU, base, TCG_REG_A0, addrl); |
| } |
| |
| static void add_qemu_ldst_label(TCGContext *s, int is_ld, TCGMemOpIdx oi, |
| TCGReg datalo, TCGReg datahi, |
| TCGReg addrlo, TCGReg addrhi, |
| void *raddr, tcg_insn_unit *label_ptr[2]) |
| { |
| TCGLabelQemuLdst *label = new_ldst_label(s); |
| |
| label->is_ld = is_ld; |
| label->oi = oi; |
| label->datalo_reg = datalo; |
| label->datahi_reg = datahi; |
| label->addrlo_reg = addrlo; |
| label->addrhi_reg = addrhi; |
| label->raddr = raddr; |
| label->label_ptr[0] = label_ptr[0]; |
| if (TARGET_LONG_BITS == 64) { |
| label->label_ptr[1] = label_ptr[1]; |
| } |
| } |
| |
| static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l) |
| { |
| TCGMemOpIdx oi = l->oi; |
| TCGMemOp opc = get_memop(oi); |
| TCGReg v0; |
| int i; |
| |
| /* resolve label address */ |
| reloc_pc16(l->label_ptr[0], s->code_ptr); |
| if (TARGET_LONG_BITS == 64) { |
| reloc_pc16(l->label_ptr[1], s->code_ptr); |
| } |
| |
| i = 1; |
| if (TARGET_LONG_BITS == 64) { |
| i = tcg_out_call_iarg_reg2(s, i, l->addrlo_reg, l->addrhi_reg); |
| } else { |
| i = tcg_out_call_iarg_reg(s, i, l->addrlo_reg); |
| } |
| i = tcg_out_call_iarg_imm(s, i, oi); |
| i = tcg_out_call_iarg_imm(s, i, (intptr_t)l->raddr); |
| tcg_out_call_int(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SSIZE)], false); |
| /* delay slot */ |
| tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0); |
| |
| v0 = l->datalo_reg; |
| if ((opc & MO_SIZE) == MO_64) { |
| /* We eliminated V0 from the possible output registers, so it |
| cannot be clobbered here. So we must move V1 first. */ |
| if (MIPS_BE) { |
| tcg_out_mov(s, TCG_TYPE_I32, v0, TCG_REG_V1); |
| v0 = l->datahi_reg; |
| } else { |
| tcg_out_mov(s, TCG_TYPE_I32, l->datahi_reg, TCG_REG_V1); |
| } |
| } |
| |
| reloc_pc16(s->code_ptr, l->raddr); |
| tcg_out_opc_br(s, OPC_BEQ, TCG_REG_ZERO, TCG_REG_ZERO); |
| /* delay slot */ |
| tcg_out_mov(s, TCG_TYPE_REG, v0, TCG_REG_V0); |
| } |
| |
| static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l) |
| { |
| TCGMemOpIdx oi = l->oi; |
| TCGMemOp opc = get_memop(oi); |
| TCGMemOp s_bits = opc & MO_SIZE; |
| int i; |
| |
| /* resolve label address */ |
| reloc_pc16(l->label_ptr[0], s->code_ptr); |
| if (TARGET_LONG_BITS == 64) { |
| reloc_pc16(l->label_ptr[1], s->code_ptr); |
| } |
| |
| i = 1; |
| if (TARGET_LONG_BITS == 64) { |
| i = tcg_out_call_iarg_reg2(s, i, l->addrlo_reg, l->addrhi_reg); |
| } else { |
| i = tcg_out_call_iarg_reg(s, i, l->addrlo_reg); |
| } |
| switch (s_bits) { |
| case MO_8: |
| i = tcg_out_call_iarg_reg8(s, i, l->datalo_reg); |
| break; |
| case MO_16: |
| i = tcg_out_call_iarg_reg16(s, i, l->datalo_reg); |
| break; |
| case MO_32: |
| i = tcg_out_call_iarg_reg(s, i, l->datalo_reg); |
| break; |
| case MO_64: |
| i = tcg_out_call_iarg_reg2(s, i, l->datalo_reg, l->datahi_reg); |
| break; |
| default: |
| tcg_abort(); |
| } |
| i = tcg_out_call_iarg_imm(s, i, oi); |
| |
| /* Tail call to the store helper. Thus force the return address |
| computation to take place in the return address register. */ |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RA, (intptr_t)l->raddr); |
| i = tcg_out_call_iarg_reg(s, i, TCG_REG_RA); |
| tcg_out_call_int(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)], true); |
| /* delay slot */ |
| tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0); |
| } |
| #endif |
| |
| static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, |
| TCGReg base, TCGMemOp opc) |
| { |
| switch (opc & (MO_SSIZE | MO_BSWAP)) { |
| case MO_UB: |
| tcg_out_opc_imm(s, OPC_LBU, datalo, base, 0); |
| break; |
| case MO_SB: |
| tcg_out_opc_imm(s, OPC_LB, datalo, base, 0); |
| break; |
| case MO_UW | MO_BSWAP: |
| tcg_out_opc_imm(s, OPC_LHU, TCG_TMP1, base, 0); |
| tcg_out_bswap16(s, datalo, TCG_TMP1); |
| break; |
| case MO_UW: |
| tcg_out_opc_imm(s, OPC_LHU, datalo, base, 0); |
| break; |
| case MO_SW | MO_BSWAP: |
| tcg_out_opc_imm(s, OPC_LHU, TCG_TMP1, base, 0); |
| tcg_out_bswap16s(s, datalo, TCG_TMP1); |
| break; |
| case MO_SW: |
| tcg_out_opc_imm(s, OPC_LH, datalo, base, 0); |
| break; |
| case MO_UL | MO_BSWAP: |
| tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, 0); |
| tcg_out_bswap32(s, datalo, TCG_TMP1); |
| break; |
| case MO_UL: |
| tcg_out_opc_imm(s, OPC_LW, datalo, base, 0); |
| break; |
| case MO_Q | MO_BSWAP: |
| tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, HI_OFF); |
| tcg_out_bswap32(s, datalo, TCG_TMP1); |
| tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, LO_OFF); |
| tcg_out_bswap32(s, datahi, TCG_TMP1); |
| break; |
| case MO_Q: |
| tcg_out_opc_imm(s, OPC_LW, datalo, base, LO_OFF); |
| tcg_out_opc_imm(s, OPC_LW, datahi, base, HI_OFF); |
| break; |
| default: |
| tcg_abort(); |
| } |
| } |
| |
| static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64) |
| { |
| TCGReg addr_regl, addr_regh __attribute__((unused)); |
| TCGReg data_regl, data_regh; |
| TCGMemOpIdx oi; |
| TCGMemOp opc; |
| #if defined(CONFIG_SOFTMMU) |
| tcg_insn_unit *label_ptr[2]; |
| #endif |
| /* Note that we've eliminated V0 from the output registers, |
| so we won't overwrite the base register during loading. */ |
| TCGReg base = TCG_REG_V0; |
| |
| data_regl = *args++; |
| data_regh = (is_64 ? *args++ : 0); |
| addr_regl = *args++; |
| addr_regh = (TARGET_LONG_BITS == 64 ? *args++ : 0); |
| oi = *args++; |
| opc = get_memop(oi); |
| |
| #if defined(CONFIG_SOFTMMU) |
| tcg_out_tlb_load(s, base, addr_regl, addr_regh, oi, label_ptr, 1); |
| tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc); |
| add_qemu_ldst_label(s, 1, oi, data_regl, data_regh, addr_regl, addr_regh, |
| s->code_ptr, label_ptr); |
| #else |
| if (guest_base == 0 && data_regl != addr_regl) { |
| base = addr_regl; |
| } else if (guest_base == (int16_t)guest_base) { |
| tcg_out_opc_imm(s, OPC_ADDIU, base, addr_regl, guest_base); |
| } else { |
| tcg_out_movi(s, TCG_TYPE_PTR, base, guest_base); |
| tcg_out_opc_reg(s, OPC_ADDU, base, base, addr_regl); |
| } |
| tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc); |
| #endif |
| } |
| |
| static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, |
| TCGReg base, TCGMemOp opc) |
| { |
| switch (opc & (MO_SIZE | MO_BSWAP)) { |
| case MO_8: |
| tcg_out_opc_imm(s, OPC_SB, datalo, base, 0); |
| break; |
| |
| case MO_16 | MO_BSWAP: |
| tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP1, datalo, 0xffff); |
| tcg_out_bswap16(s, TCG_TMP1, TCG_TMP1); |
| datalo = TCG_TMP1; |
| /* FALLTHRU */ |
| case MO_16: |
| tcg_out_opc_imm(s, OPC_SH, datalo, base, 0); |
| break; |
| |
| case MO_32 | MO_BSWAP: |
| tcg_out_bswap32(s, TCG_TMP1, datalo); |
| datalo = TCG_TMP1; |
| /* FALLTHRU */ |
| case MO_32: |
| tcg_out_opc_imm(s, OPC_SW, datalo, base, 0); |
| break; |
| |
| case MO_64 | MO_BSWAP: |
| tcg_out_bswap32(s, TCG_TMP1, datalo); |
| tcg_out_opc_imm(s, OPC_SW, TCG_TMP1, base, HI_OFF); |
| tcg_out_bswap32(s, TCG_TMP1, datahi); |
| tcg_out_opc_imm(s, OPC_SW, TCG_TMP1, base, LO_OFF); |
| break; |
| case MO_64: |
| tcg_out_opc_imm(s, OPC_SW, datalo, base, LO_OFF); |
| tcg_out_opc_imm(s, OPC_SW, datahi, base, HI_OFF); |
| break; |
| |
| default: |
| tcg_abort(); |
| } |
| } |
| |
| static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64) |
| { |
| TCGReg addr_regl, addr_regh __attribute__((unused)); |
| TCGReg data_regl, data_regh, base; |
| TCGMemOpIdx oi; |
| TCGMemOp opc; |
| #if defined(CONFIG_SOFTMMU) |
| tcg_insn_unit *label_ptr[2]; |
| #endif |
| |
| data_regl = *args++; |
| data_regh = (is_64 ? *args++ : 0); |
| addr_regl = *args++; |
| addr_regh = (TARGET_LONG_BITS == 64 ? *args++ : 0); |
| oi = *args++; |
| opc = get_memop(oi); |
| |
| #if defined(CONFIG_SOFTMMU) |
| /* Note that we eliminated the helper's address argument, |
| so we can reuse that for the base. */ |
| base = (TARGET_LONG_BITS == 32 ? TCG_REG_A1 : TCG_REG_A2); |
| tcg_out_tlb_load(s, base, addr_regl, addr_regh, oi, label_ptr, 0); |
| tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc); |
| add_qemu_ldst_label(s, 0, oi, data_regl, data_regh, addr_regl, addr_regh, |
| s->code_ptr, label_ptr); |
| #else |
| if (guest_base == 0) { |
| base = addr_regl; |
| } else { |
| base = TCG_REG_A0; |
| if (guest_base == (int16_t)guest_base) { |
| tcg_out_opc_imm(s, OPC_ADDIU, base, addr_regl, guest_base); |
| } else { |
| tcg_out_movi(s, TCG_TYPE_PTR, base, guest_base); |
| tcg_out_opc_reg(s, OPC_ADDU, base, base, addr_regl); |
| } |
| } |
| tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc); |
| #endif |
| } |
| |
| static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, |
| const TCGArg *args, const int *const_args) |
| { |
| MIPSInsn i1, i2; |
| TCGArg a0, a1, a2; |
| int c2; |
| |
| a0 = args[0]; |
| a1 = args[1]; |
| a2 = args[2]; |
| c2 = const_args[2]; |
| |
| switch (opc) { |
| case INDEX_op_exit_tb: |
| { |
| TCGReg b0 = TCG_REG_ZERO; |
| |
| if (a0 & ~0xffff) { |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_V0, a0 & ~0xffff); |
| b0 = TCG_REG_V0; |
| } |
| if (!tcg_out_opc_jmp(s, OPC_J, tb_ret_addr)) { |
| tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, |
| (uintptr_t)tb_ret_addr); |
| tcg_out_opc_reg(s, OPC_JR, 0, TCG_TMP0, 0); |
| } |
| tcg_out_opc_imm(s, OPC_ORI, TCG_REG_V0, b0, a0 & 0xffff); |
| } |
| break; |
| case INDEX_op_goto_tb: |
| if (s->tb_jmp_offset) { |
| /* direct jump method */ |
| s->tb_jmp_offset[a0] = tcg_current_code_size(s); |
| /* Avoid clobbering the address during retranslation. */ |
| tcg_out32(s, OPC_J | (*(uint32_t *)s->code_ptr & 0x3ffffff)); |
| } else { |
| /* indirect jump method */ |
| tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP0, TCG_REG_ZERO, |
| (uintptr_t)(s->tb_next + a0)); |
| tcg_out_opc_reg(s, OPC_JR, 0, TCG_TMP0, 0); |
| } |
| tcg_out_nop(s); |
| s->tb_next_offset[a0] = tcg_current_code_size(s); |
| break; |
| case INDEX_op_br: |
| tcg_out_brcond(s, TCG_COND_EQ, TCG_REG_ZERO, TCG_REG_ZERO, |
| arg_label(a0)); |
| break; |
| |
| case INDEX_op_ld8u_i32: |
| i1 = OPC_LBU; |
| goto do_ldst; |
| case INDEX_op_ld8s_i32: |
| i1 = OPC_LB; |
| goto do_ldst; |
| case INDEX_op_ld16u_i32: |
| i1 = OPC_LHU; |
| goto do_ldst; |
| case INDEX_op_ld16s_i32: |
| i1 = OPC_LH; |
| goto do_ldst; |
| case INDEX_op_ld_i32: |
| i1 = OPC_LW; |
| goto do_ldst; |
| case INDEX_op_st8_i32: |
| i1 = OPC_SB; |
| goto do_ldst; |
| case INDEX_op_st16_i32: |
| i1 = OPC_SH; |
| goto do_ldst; |
| case INDEX_op_st_i32: |
| i1 = OPC_SW; |
| do_ldst: |
| tcg_out_ldst(s, i1, a0, a1, a2); |
| break; |
| |
| case INDEX_op_add_i32: |
| i1 = OPC_ADDU, i2 = OPC_ADDIU; |
| goto do_binary; |
| case INDEX_op_or_i32: |
| i1 = OPC_OR, i2 = OPC_ORI; |
| goto do_binary; |
| case INDEX_op_xor_i32: |
| i1 = OPC_XOR, i2 = OPC_XORI; |
| do_binary: |
| if (c2) { |
| tcg_out_opc_imm(s, i2, a0, a1, a2); |
| break; |
| } |
| do_binaryv: |
| tcg_out_opc_reg(s, i1, a0, a1, a2); |
| break; |
| |
| case INDEX_op_sub_i32: |
| if (c2) { |
| tcg_out_opc_imm(s, OPC_ADDIU, a0, a1, -a2); |
| break; |
| } |
| i1 = OPC_SUBU; |
| goto do_binary; |
| case INDEX_op_and_i32: |
| if (c2 && a2 != (uint16_t)a2) { |
| int msb = ctz32(~a2) - 1; |
| assert(use_mips32r2_instructions); |
| assert(is_p2m1(a2)); |
| tcg_out_opc_bf(s, OPC_EXT, a0, a1, msb, 0); |
| break; |
| } |
| i1 = OPC_AND, i2 = OPC_ANDI; |
| goto do_binary; |
| case INDEX_op_nor_i32: |
| i1 = OPC_NOR; |
| goto do_binaryv; |
| |
| case INDEX_op_mul_i32: |
| if (use_mips32_instructions) { |
| tcg_out_opc_reg(s, OPC_MUL, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_MULT, i2 = OPC_MFLO; |
| goto do_hilo1; |
| case INDEX_op_mulsh_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_MUH, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_MULT, i2 = OPC_MFHI; |
| goto do_hilo1; |
| case INDEX_op_muluh_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_MUHU, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_MULTU, i2 = OPC_MFHI; |
| goto do_hilo1; |
| case INDEX_op_div_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_DIV_R6, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_DIV, i2 = OPC_MFLO; |
| goto do_hilo1; |
| case INDEX_op_divu_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_DIVU_R6, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_DIVU, i2 = OPC_MFLO; |
| goto do_hilo1; |
| case INDEX_op_rem_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_MOD, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_DIV, i2 = OPC_MFHI; |
| goto do_hilo1; |
| case INDEX_op_remu_i32: |
| if (use_mips32r6_instructions) { |
| tcg_out_opc_reg(s, OPC_MODU, a0, a1, a2); |
| break; |
| } |
| i1 = OPC_DIVU, i2 = OPC_MFHI; |
| do_hilo1: |
| tcg_out_opc_reg(s, i1, 0, a1, a2); |
| tcg_out_opc_reg(s, i2, a0, 0, 0); |
| break; |
| |
| case INDEX_op_muls2_i32: |
| i1 = OPC_MULT; |
| goto do_hilo2; |
| case INDEX_op_mulu2_i32: |
| i1 = OPC_MULTU; |
| do_hilo2: |
| tcg_out_opc_reg(s, i1, 0, a2, args[3]); |
| tcg_out_opc_reg(s, OPC_MFLO, a0, 0, 0); |
| tcg_out_opc_reg(s, OPC_MFHI, a1, 0, 0); |
| break; |
| |
| case INDEX_op_not_i32: |
| i1 = OPC_NOR; |
| goto do_unary; |
| case INDEX_op_bswap16_i32: |
| i1 = OPC_WSBH; |
| goto do_unary; |
| case INDEX_op_ext8s_i32: |
| i1 = OPC_SEB; |
| goto do_unary; |
| case INDEX_op_ext16s_i32: |
| i1 = OPC_SEH; |
| do_unary: |
| tcg_out_opc_reg(s, i1, a0, TCG_REG_ZERO, a1); |
| break; |
| |
| case INDEX_op_sar_i32: |
| i1 = OPC_SRAV, i2 = OPC_SRA; |
| goto do_shift; |
| case INDEX_op_shl_i32: |
| i1 = OPC_SLLV, i2 = OPC_SLL; |
| goto do_shift; |
| case INDEX_op_shr_i32: |
| i1 = OPC_SRLV, i2 = OPC_SRL; |
| goto do_shift; |
| case INDEX_op_rotr_i32: |
| i1 = OPC_ROTRV, i2 = OPC_ROTR; |
| do_shift: |
| if (c2) { |
| tcg_out_opc_sa(s, i2, a0, a1, a2); |
| } else { |
| tcg_out_opc_reg(s, i1, a0, a2, a1); |
| } |
| break; |
| case INDEX_op_rotl_i32: |
| if (c2) { |
| tcg_out_opc_sa(s, OPC_ROTR, a0, a1, 32 - a2); |
| } else { |
| tcg_out_opc_reg(s, OPC_SUBU, TCG_TMP0, TCG_REG_ZERO, a2); |
| tcg_out_opc_reg(s, OPC_ROTRV, a0, TCG_TMP0, a1); |
| } |
| break; |
| |
| case INDEX_op_bswap32_i32: |
| tcg_out_opc_reg(s, OPC_WSBH, a0, 0, a1); |
| tcg_out_opc_sa(s, OPC_ROTR, a0, a0, 16); |
| break; |
| |
| case INDEX_op_deposit_i32: |
| tcg_out_opc_bf(s, OPC_INS, a0, a2, args[3] + args[4] - 1, args[3]); |
| break; |
| |
| case INDEX_op_brcond_i32: |
| tcg_out_brcond(s, a2, a0, a1, arg_label(args[3])); |
| break; |
| case INDEX_op_brcond2_i32: |
| tcg_out_brcond2(s, args[4], a0, a1, a2, args[3], arg_label(args[5])); |
| break; |
| |
| case INDEX_op_movcond_i32: |
| tcg_out_movcond(s, args[5], a0, a1, a2, args[3]); |
| break; |
| |
| case INDEX_op_setcond_i32: |
| tcg_out_setcond(s, args[3], a0, a1, a2); |
| break; |
| case INDEX_op_setcond2_i32: |
| tcg_out_setcond2(s, args[5], a0, a1, a2, args[3], args[4]); |
| break; |
| |
| case INDEX_op_qemu_ld_i32: |
| tcg_out_qemu_ld(s, args, false); |
| break; |
| case INDEX_op_qemu_ld_i64: |
| tcg_out_qemu_ld(s, args, true); |
| break; |
| case INDEX_op_qemu_st_i32: |
| tcg_out_qemu_st(s, args, false); |
| break; |
| case INDEX_op_qemu_st_i64: |
| tcg_out_qemu_st(s, args, true); |
| break; |
| |
| case INDEX_op_add2_i32: |
| tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5], |
| const_args[4], const_args[5], false); |
| break; |
| case INDEX_op_sub2_i32: |
| tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5], |
| const_args[4], const_args[5], true); |
| break; |
| |
| case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */ |
| case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi. */ |
| case INDEX_op_call: /* Always emitted via tcg_out_call. */ |
| default: |
| tcg_abort(); |
| } |
| } |
| |
| static const TCGTargetOpDef mips_op_defs[] = { |
| { INDEX_op_exit_tb, { } }, |
| { INDEX_op_goto_tb, { } }, |
| { INDEX_op_br, { } }, |
| |
| { INDEX_op_ld8u_i32, { "r", "r" } }, |
| { INDEX_op_ld8s_i32, { "r", "r" } }, |
| { INDEX_op_ld16u_i32, { "r", "r" } }, |
| { INDEX_op_ld16s_i32, { "r", "r" } }, |
| { INDEX_op_ld_i32, { "r", "r" } }, |
| { INDEX_op_st8_i32, { "rZ", "r" } }, |
| { INDEX_op_st16_i32, { "rZ", "r" } }, |
| { INDEX_op_st_i32, { "rZ", "r" } }, |
| |
| { INDEX_op_add_i32, { "r", "rZ", "rJ" } }, |
| { INDEX_op_mul_i32, { "r", "rZ", "rZ" } }, |
| #if !use_mips32r6_instructions |
| { INDEX_op_muls2_i32, { "r", "r", "rZ", "rZ" } }, |
| { INDEX_op_mulu2_i32, { "r", "r", "rZ", "rZ" } }, |
| #endif |
| { INDEX_op_mulsh_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_muluh_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_div_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_divu_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_rem_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_remu_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_sub_i32, { "r", "rZ", "rN" } }, |
| |
| { INDEX_op_and_i32, { "r", "rZ", "rIK" } }, |
| { INDEX_op_nor_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_not_i32, { "r", "rZ" } }, |
| { INDEX_op_or_i32, { "r", "rZ", "rIZ" } }, |
| { INDEX_op_xor_i32, { "r", "rZ", "rIZ" } }, |
| |
| { INDEX_op_shl_i32, { "r", "rZ", "ri" } }, |
| { INDEX_op_shr_i32, { "r", "rZ", "ri" } }, |
| { INDEX_op_sar_i32, { "r", "rZ", "ri" } }, |
| { INDEX_op_rotr_i32, { "r", "rZ", "ri" } }, |
| { INDEX_op_rotl_i32, { "r", "rZ", "ri" } }, |
| |
| { INDEX_op_bswap16_i32, { "r", "r" } }, |
| { INDEX_op_bswap32_i32, { "r", "r" } }, |
| |
| { INDEX_op_ext8s_i32, { "r", "rZ" } }, |
| { INDEX_op_ext16s_i32, { "r", "rZ" } }, |
| |
| { INDEX_op_deposit_i32, { "r", "0", "rZ" } }, |
| |
| { INDEX_op_brcond_i32, { "rZ", "rZ" } }, |
| { INDEX_op_movcond_i32, { "r", "rZ", "rZ", "rZ", "0" } }, |
| { INDEX_op_setcond_i32, { "r", "rZ", "rZ" } }, |
| { INDEX_op_setcond2_i32, { "r", "rZ", "rZ", "rZ", "rZ" } }, |
| |
| { INDEX_op_add2_i32, { "r", "r", "rZ", "rZ", "rN", "rN" } }, |
| { INDEX_op_sub2_i32, { "r", "r", "rZ", "rZ", "rN", "rN" } }, |
| { INDEX_op_brcond2_i32, { "rZ", "rZ", "rZ", "rZ" } }, |
| |
| #if TARGET_LONG_BITS == 32 |
| { INDEX_op_qemu_ld_i32, { "L", "lZ" } }, |
| { INDEX_op_qemu_st_i32, { "SZ", "SZ" } }, |
| { INDEX_op_qemu_ld_i64, { "L", "L", "lZ" } }, |
| { INDEX_op_qemu_st_i64, { "SZ", "SZ", "SZ" } }, |
| #else |
| { INDEX_op_qemu_ld_i32, { "L", "lZ", "lZ" } }, |
| { INDEX_op_qemu_st_i32, { "SZ", "SZ", "SZ" } }, |
| { INDEX_op_qemu_ld_i64, { "L", "L", "lZ", "lZ" } }, |
| { INDEX_op_qemu_st_i64, { "SZ", "SZ", "SZ", "SZ" } }, |
| #endif |
| { -1 }, |
| }; |
| |
| static int tcg_target_callee_save_regs[] = { |
| TCG_REG_S0, /* used for the global env (TCG_AREG0) */ |
| TCG_REG_S1, |
| TCG_REG_S2, |
| TCG_REG_S3, |
| TCG_REG_S4, |
| TCG_REG_S5, |
| TCG_REG_S6, |
| TCG_REG_S7, |
| TCG_REG_S8, |
| TCG_REG_RA, /* should be last for ABI compliance */ |
| }; |
| |
| /* The Linux kernel doesn't provide any information about the available |
| instruction set. Probe it using a signal handler. */ |
| |
| #include <signal.h> |
| |
| #ifndef use_movnz_instructions |
| bool use_movnz_instructions = false; |
| #endif |
| |
| #ifndef use_mips32_instructions |
| bool use_mips32_instructions = false; |
| #endif |
| |
| #ifndef use_mips32r2_instructions |
| bool use_mips32r2_instructions = false; |
| #endif |
| |
| static volatile sig_atomic_t got_sigill; |
| |
| static void sigill_handler(int signo, siginfo_t *si, void *data) |
| { |
| /* Skip the faulty instruction */ |
| ucontext_t *uc = (ucontext_t *)data; |
| uc->uc_mcontext.pc += 4; |
| |
| got_sigill = 1; |
| } |
| |
| static void tcg_target_detect_isa(void) |
| { |
| struct sigaction sa_old, sa_new; |
| |
| memset(&sa_new, 0, sizeof(sa_new)); |
| sa_new.sa_flags = SA_SIGINFO; |
| sa_new.sa_sigaction = sigill_handler; |
| sigaction(SIGILL, &sa_new, &sa_old); |
| |
| /* Probe for movn/movz, necessary to implement movcond. */ |
| #ifndef use_movnz_instructions |
| got_sigill = 0; |
| asm volatile(".set push\n" |
| ".set mips32\n" |
| "movn $zero, $zero, $zero\n" |
| "movz $zero, $zero, $zero\n" |
| ".set pop\n" |
| : : : ); |
| use_movnz_instructions = !got_sigill; |
| #endif |
| |
| /* Probe for MIPS32 instructions. As no subsetting is allowed |
| by the specification, it is only necessary to probe for one |
| of the instructions. */ |
| #ifndef use_mips32_instructions |
| got_sigill = 0; |
| asm volatile(".set push\n" |
| ".set mips32\n" |
| "mul $zero, $zero\n" |
| ".set pop\n" |
| : : : ); |
| use_mips32_instructions = !got_sigill; |
| #endif |
| |
| /* Probe for MIPS32r2 instructions if MIPS32 instructions are |
| available. As no subsetting is allowed by the specification, |
| it is only necessary to probe for one of the instructions. */ |
| #ifndef use_mips32r2_instructions |
| if (use_mips32_instructions) { |
| got_sigill = 0; |
| asm volatile(".set push\n" |
| ".set mips32r2\n" |
| "seb $zero, $zero\n" |
| ".set pop\n" |
| : : : ); |
| use_mips32r2_instructions = !got_sigill; |
| } |
| #endif |
| |
| sigaction(SIGILL, &sa_old, NULL); |
| } |
| |
| /* Generate global QEMU prologue and epilogue code */ |
| static void tcg_target_qemu_prologue(TCGContext *s) |
| { |
| int i, frame_size; |
| |
| /* reserve some stack space, also for TCG temps. */ |
| frame_size = ARRAY_SIZE(tcg_target_callee_save_regs) * 4 |
| + TCG_STATIC_CALL_ARGS_SIZE |
| + CPU_TEMP_BUF_NLONGS * sizeof(long); |
| frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) & |
| ~(TCG_TARGET_STACK_ALIGN - 1); |
| tcg_set_frame(s, TCG_REG_SP, ARRAY_SIZE(tcg_target_callee_save_regs) * 4 |
| + TCG_STATIC_CALL_ARGS_SIZE, |
| CPU_TEMP_BUF_NLONGS * sizeof(long)); |
| |
| /* TB prologue */ |
| tcg_out_addi(s, TCG_REG_SP, -frame_size); |
| for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) { |
| tcg_out_st(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i], |
| TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4); |
| } |
| |
| /* Call generated code */ |
| tcg_out_opc_reg(s, OPC_JR, 0, tcg_target_call_iarg_regs[1], 0); |
| tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]); |
| tb_ret_addr = s->code_ptr; |
| |
| /* TB epilogue */ |
| for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) { |
| tcg_out_ld(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i], |
| TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4); |
| } |
| |
| tcg_out_opc_reg(s, OPC_JR, 0, TCG_REG_RA, 0); |
| tcg_out_addi(s, TCG_REG_SP, frame_size); |
| } |
| |
| static void tcg_target_init(TCGContext *s) |
| { |
| tcg_target_detect_isa(); |
| tcg_regset_set(tcg_target_available_regs[TCG_TYPE_I32], 0xffffffff); |
| tcg_regset_set(tcg_target_call_clobber_regs, |
| (1 << TCG_REG_V0) | |
| (1 << TCG_REG_V1) | |
| (1 << TCG_REG_A0) | |
| (1 << TCG_REG_A1) | |
| (1 << TCG_REG_A2) | |
| (1 << TCG_REG_A3) | |
| (1 << TCG_REG_T0) | |
| (1 << TCG_REG_T1) | |
| (1 << TCG_REG_T2) | |
| (1 << TCG_REG_T3) | |
| (1 << TCG_REG_T4) | |
| (1 << TCG_REG_T5) | |
| (1 << TCG_REG_T6) | |
| (1 << TCG_REG_T7) | |
| (1 << TCG_REG_T8) | |
| (1 << TCG_REG_T9)); |
| |
| tcg_regset_clear(s->reserved_regs); |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_ZERO); /* zero register */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_K0); /* kernel use only */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_K1); /* kernel use only */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_TMP0); /* internal use */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_TMP1); /* internal use */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_RA); /* return address */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_SP); /* stack pointer */ |
| tcg_regset_set_reg(s->reserved_regs, TCG_REG_GP); /* global pointer */ |
| |
| tcg_add_target_add_op_defs(mips_op_defs); |
| } |
| |
| void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) |
| { |
| uint32_t *ptr = (uint32_t *)jmp_addr; |
| *ptr = deposit32(*ptr, 0, 26, addr >> 2); |
| flush_icache_range(jmp_addr, jmp_addr + 4); |
| } |
