diff options
Diffstat (limited to 'tcg/mips/tcg-target.c')
| -rw-r--r-- | tcg/mips/tcg-target.c | 224 |
1 files changed, 147 insertions, 77 deletions
diff --git a/tcg/mips/tcg-target.c b/tcg/mips/tcg-target.c index 3c2b394753..5f0a65b4ea 100644 --- a/tcg/mips/tcg-target.c +++ b/tcg/mips/tcg-target.c @@ -422,83 +422,83 @@ static inline void tcg_out_movi(TCGContext *s, TCGType type, static inline void tcg_out_bswap16(TCGContext *s, TCGReg ret, TCGReg arg) { -#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2) - tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg); -#else - /* ret and arg can't be register at */ - if (ret == TCG_REG_AT || arg == TCG_REG_AT) { - tcg_abort(); - } + 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_REG_AT || arg == TCG_REG_AT) { + tcg_abort(); + } - tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, 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_REG_AT); -#endif + tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, 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_REG_AT); + } } static inline void tcg_out_bswap16s(TCGContext *s, TCGReg ret, TCGReg arg) { -#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2) - 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_REG_AT || arg == TCG_REG_AT) { - tcg_abort(); - } + 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_REG_AT || arg == TCG_REG_AT) { + tcg_abort(); + } - tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, 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_REG_AT); -#endif + tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, 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_REG_AT); + } } static inline void tcg_out_bswap32(TCGContext *s, TCGReg ret, TCGReg arg) { -#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2) - 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_REG_AT || arg == TCG_REG_AT) { - tcg_abort(); - } + 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_REG_AT || arg == TCG_REG_AT) { + tcg_abort(); + } - tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24); + tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24); - tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 24); - tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); + tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 24); + tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); - tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, arg, 0xff00); - tcg_out_opc_sa(s, OPC_SLL, TCG_REG_AT, TCG_REG_AT, 8); - tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); + tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, arg, 0xff00); + tcg_out_opc_sa(s, OPC_SLL, TCG_REG_AT, TCG_REG_AT, 8); + tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); - tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8); - tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff00); - tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); -#endif + tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8); + tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff00); + tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT); + } } static inline void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg) { -#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2) - 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); -#endif + 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 defined(__mips_isa_rev) && (__mips_isa_rev >= 2) - 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); -#endif + 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 inline void tcg_out_ldst(TCGContext *s, int opc, TCGArg arg, @@ -1403,12 +1403,12 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, tcg_out_mov(s, TCG_TYPE_I32, args[0], TCG_REG_AT); break; case INDEX_op_mul_i32: -#if defined(__mips_isa_rev) && (__mips_isa_rev >= 1) - tcg_out_opc_reg(s, OPC_MUL, args[0], args[1], args[2]); -#else - tcg_out_opc_reg(s, OPC_MULT, 0, args[1], args[2]); - tcg_out_opc_reg(s, OPC_MFLO, args[0], 0, 0); -#endif + if (use_mips32_instructions) { + tcg_out_opc_reg(s, OPC_MUL, args[0], args[1], args[2]); + } else { + tcg_out_opc_reg(s, OPC_MULT, 0, args[1], args[2]); + tcg_out_opc_reg(s, OPC_MFLO, args[0], 0, 0); + } break; case INDEX_op_muls2_i32: tcg_out_opc_reg(s, OPC_MULT, 0, args[2], args[3]); @@ -1511,20 +1511,19 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, } break; - /* The bswap routines do not work on non-R2 CPU. In that case - we let TCG generating the corresponding code. */ case INDEX_op_bswap16_i32: - tcg_out_bswap16(s, args[0], args[1]); + tcg_out_opc_reg(s, OPC_WSBH, args[0], 0, args[1]); break; case INDEX_op_bswap32_i32: - tcg_out_bswap32(s, args[0], args[1]); + tcg_out_opc_reg(s, OPC_WSBH, args[0], 0, args[1]); + tcg_out_opc_sa(s, OPC_ROTR, args[0], args[0], 16); break; case INDEX_op_ext8s_i32: - tcg_out_ext8s(s, args[0], args[1]); + tcg_out_opc_reg(s, OPC_SEB, args[0], 0, args[1]); break; case INDEX_op_ext16s_i32: - tcg_out_ext16s(s, args[0], args[1]); + tcg_out_opc_reg(s, OPC_SEH, args[0], 0, args[1]); break; case INDEX_op_deposit_i32: @@ -1624,29 +1623,19 @@ static const TCGTargetOpDef mips_op_defs[] = { { INDEX_op_shl_i32, { "r", "rZ", "ri" } }, { INDEX_op_shr_i32, { "r", "rZ", "ri" } }, { INDEX_op_sar_i32, { "r", "rZ", "ri" } }, -#if TCG_TARGET_HAS_rot_i32 { INDEX_op_rotr_i32, { "r", "rZ", "ri" } }, { INDEX_op_rotl_i32, { "r", "rZ", "ri" } }, -#endif -#if TCG_TARGET_HAS_bswap16_i32 { INDEX_op_bswap16_i32, { "r", "r" } }, -#endif -#if TCG_TARGET_HAS_bswap32_i32 { INDEX_op_bswap32_i32, { "r", "r" } }, -#endif { INDEX_op_ext8s_i32, { "r", "rZ" } }, { INDEX_op_ext16s_i32, { "r", "rZ" } }, -#if TCG_TARGET_HAS_deposit_i32 { INDEX_op_deposit_i32, { "r", "0", "rZ" } }, -#endif { INDEX_op_brcond_i32, { "rZ", "rZ" } }, -#if TCG_TARGET_HAS_movcond_i32 { INDEX_op_movcond_i32, { "r", "rZ", "rZ", "rZ", "0" } }, -#endif { INDEX_op_setcond_i32, { "r", "rZ", "rZ" } }, { INDEX_op_setcond2_i32, { "r", "rZ", "rZ", "rZ", "rZ" } }, @@ -1695,6 +1684,86 @@ static int tcg_target_callee_save_regs[] = { 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) { @@ -1734,6 +1803,7 @@ static void tcg_target_qemu_prologue(TCGContext *s) 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) | |