/* * jit-rules-alpha.h - Rules that define the characteristics of the alpha. * * Copyright (C) 2006 Southern Storm Software, Pty Ltd. * * This file is part of the libjit library. * * The libjit library is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation, either version 2.1 of * the License, or (at your option) any later version. * * The libjit library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with the libjit library. If not, see * . */ #ifndef _JIT_RULES_ALPHA_H #define _JIT_RULES_ALPHA_H #ifdef __cplusplus extern "C" { #endif /* * alpha has 32 64-bit floating-point registers. Each can hold either * 1 32-bit float or 1 64-bit double. */ #define JIT_REG_ALPHA_FLOAT \ (JIT_REG_FLOAT32 | JIT_REG_FLOAT64 | JIT_REG_NFLOAT) /* * alpha has 32 64-bit integer registers that can hold WORD and LONG values */ #define JIT_REG_ALPHA_INT \ (JIT_REG_WORD | JIT_REG_LONG) /* * Integer registers * * $0 - function results. * $1..$8 - Temp registers. * $9..$14 - Saved registers. * $15/$fp - Frame pointer or saved register. * $16-$21 - First 6 arguments. * $22-$25 - Temp registers. * $26 - Return address. * $27 - Procedure value or temp register. * $28/$at - Reserved for the assembler. * $29/$gp - Global pointer. * $30/$sp - Stack pointer. * $31 - Contains the value 0. * * Floating-point registers * * $f0,$f1 - function results. $f0 = real component $f1 = imaginary component * $f2..$f9 - Saved registers. * $f10..$f15 - Temp registers. * $f16..$f21 - First 6 arguments. * $f22..$f30 - Temp registers for expression evaluation. * $f31 - Contains the value 0.0. */ #define JIT_REG_INFO \ { "v0", 0, -1, JIT_REG_FIXED}, \ { "t0", 1, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t1", 2, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t2", 3, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t3", 4, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t4", 5, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t5", 6, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t6", 7, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t7", 8, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "s0", 9, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "s1", 10, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "s2", 11, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "s3", 12, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "s4", 13, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "s5", 14, -1, JIT_REG_ALPHA_INT | JIT_REG_GLOBAL}, \ { "fp", 15, -1, JIT_REG_FIXED | JIT_REG_FRAME}, \ { "a0", 16, -1, JIT_REG_FIXED}, \ { "a1", 17, -1, JIT_REG_FIXED}, \ { "a2", 18, -1, JIT_REG_FIXED}, \ { "a3", 19, -1, JIT_REG_FIXED}, \ { "a4", 20, -1, JIT_REG_FIXED}, \ { "a5", 21, -1, JIT_REG_FIXED}, \ { "t8", 22, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t9", 23, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t10", 24, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "t11", 25, -1, JIT_REG_ALPHA_INT | JIT_REG_CALL_USED}, \ { "ra", 26, -1, JIT_REG_FIXED}, \ { "pv", 27, -1, JIT_REG_FIXED}, \ { "at", 28, -1, JIT_REG_FIXED}, \ { "gp", 29, -1, JIT_REG_FIXED}, \ { "sp", 30, -1, JIT_REG_FIXED | JIT_REG_STACK_PTR}, \ { "zero", 31, -1, JIT_REG_FIXED}, \ { "fv0", 0, -1, JIT_REG_FIXED}, \ { "fv1", 1, -1, JIT_REG_FIXED}, \ { "fs0", 2, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs1", 3, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs2", 4, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs3", 5, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs4", 6, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs5", 7, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs6", 8, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "fs7", 9, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_GLOBAL}, \ { "ft0", 10, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "ft1", 11, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "ft2", 12, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "ft3", 13, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "ft4", 14, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "ft5", 15, -1, JIT_REG_ALPHA_FLOAT | JIT_REG_CALL_USED}, \ { "fa0", 16, -1, JIT_REG_FIXED}, \ { "fa1", 17, -1, JIT_REG_FIXED}, \ { "fa2", 18, -1, JIT_REG_FIXED}, \ { "fa3", 19, -1, JIT_REG_FIXED}, \ { "fa4", 20, -1, JIT_REG_FIXED}, \ { "fa5", 21, -1, JIT_REG_FIXED}, \ { "fe0", 22, -1, JIT_REG_FIXED}, \ { "fe1", 23, -1, JIT_REG_FIXED}, \ { "fe2", 24, -1, JIT_REG_FIXED}, \ { "fe3", 25, -1, JIT_REG_FIXED}, \ { "fe4", 26, -1, JIT_REG_FIXED}, \ { "fe5", 27, -1, JIT_REG_FIXED}, \ { "fe6", 28, -1, JIT_REG_FIXED}, \ { "fe7", 29, -1, JIT_REG_FIXED}, \ { "fe8", 30, -1, JIT_REG_FIXED}, \ {"fzero", 31, -1, JIT_REG_FIXED}, /* 32 floating-point registers + 32 integer registers */ #define JIT_NUM_REGS 64 /* * The number of registers that are used for global register * allocation. Set to zero if global register allocation should not be * used. */ #define JIT_NUM_GLOBAL_REGS 14 /* * Define to 1 if we should always load values into registers * before operating on them. i.e. the CPU does not have reg-mem * and mem-reg addressing modes. * * The maximum number of operands for an alpha instruction is 3, * all of which must be registers. */ #define JIT_ALWAYS_REG_REG 1 /* * The maximum number of bytes to allocate for the prolog. * This may be shortened once we know the true prolog size. */ #define JIT_PROLOG_SIZE (7 /* instructions */ * 4 /* bytes per instruction */) /* * Preferred alignment for the start of functions. * * Use the alignment that gcc uses. See gcc/config/alpha/alpha.h */ #define JIT_FUNCTION_ALIGNMENT 32 /* * Define this to 1 if the platform allows reads and writes on * any byte boundary. Define to 0 if only properly-aligned * memory accesses are allowed. * * All memory access on alpha must be naturally aligned. There are * unaligned load and store instructions to operate on arbitrary byte * boundaries. However sometimes compilers don't always spot where * to use them due to programming tricks with pointers. The kernel will * do the fetch transparently if the access is unaligned and not done * with the proper instructions. Kernel assisted unaligned accesses * don't change the behavior of the program. * * TODO: benchmark this to determine what is more costly... setting * up everything to be aligned or dealing with the unaligned accesses. */ #define JIT_ALIGN_OVERRIDES 1 /* * The jit_extra_gen_state macro can be supplied to add extra fields to * the struct jit_gencode type in jit-rules.h, for extra CPU-specific * code generation state information. */ #define jit_extra_gen_state /* empty */; /* * The jit_extra_gen_init macro initializes this extra information, and * the jit_extra_gen_cleanup macro cleans it up when code generation is * complete. */ #define jit_extra_gen_init(gen) do { ; } while (0) #define jit_extra_gen_cleanup(gen) do { ; } while (0) /* * Parameter passing rules. */ #define JIT_CDECL_WORD_REG_PARAMS {16,17,18,19,20,21,-1} #define JIT_MAX_WORD_REG_PARAMS 6 #define JIT_INITIAL_STACK_OFFSET (14*8) #define JIT_INITIAL_FRAME_SIZE (sizeof(void*)) #ifdef __cplusplus }; #endif #endif /* _JIT_RULES_ALPHA_H */