[279] | 1 | /*
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| 2 | * X86 code generator for TCC
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| 3 | *
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| 4 | * Copyright (c) 2001-2004 Fabrice Bellard
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 |
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| 21 | #ifdef TARGET_DEFS_ONLY
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| 22 |
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| 23 | /* number of available registers */
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| 24 | #define NB_REGS 4
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| 25 | #define NB_ASM_REGS 8
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| 26 |
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| 27 | /* a register can belong to several classes. The classes must be
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| 28 | sorted from more general to more precise (see gv2() code which does
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| 29 | assumptions on it). */
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| 30 | #define RC_INT 0x0001 /* generic integer register */
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| 31 | #define RC_FLOAT 0x0002 /* generic float register */
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| 32 | #define RC_EAX 0x0004
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| 33 | #define RC_ST0 0x0008
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| 34 | #define RC_ECX 0x0010
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| 35 | #define RC_EDX 0x0020
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| 36 | #define RC_IRET RC_EAX /* function return: integer register */
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| 37 | #define RC_LRET RC_EDX /* function return: second integer register */
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| 38 | #define RC_FRET RC_ST0 /* function return: float register */
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| 39 |
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| 40 | /* pretty names for the registers */
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| 41 | enum {
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| 42 | TREG_EAX = 0,
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| 43 | TREG_ECX,
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| 44 | TREG_EDX,
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| 45 | TREG_ST0,
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| 46 | };
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| 47 |
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| 48 | /* return registers for function */
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| 49 | #define REG_IRET TREG_EAX /* single word int return register */
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| 50 | #define REG_LRET TREG_EDX /* second word return register (for long long) */
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| 51 | #define REG_FRET TREG_ST0 /* float return register */
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| 52 |
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| 53 | /* defined if function parameters must be evaluated in reverse order */
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| 54 | #define INVERT_FUNC_PARAMS
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| 55 |
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| 56 | /* defined if structures are passed as pointers. Otherwise structures
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| 57 | are directly pushed on stack. */
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| 58 | //#define FUNC_STRUCT_PARAM_AS_PTR
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| 59 |
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| 60 | /* pointer size, in bytes */
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| 61 | #define PTR_SIZE 4
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| 62 |
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| 63 | /* long double size and alignment, in bytes */
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| 64 | #define LDOUBLE_SIZE 12
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| 65 | #define LDOUBLE_ALIGN 4
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| 66 | /* maximum alignment (for aligned attribute support) */
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| 67 | #define MAX_ALIGN 8
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| 68 |
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| 69 |
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| 70 | #define psym oad
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| 71 |
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| 72 | /******************************************************/
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| 73 | /* ELF defines */
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| 74 |
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| 75 | #define EM_TCC_TARGET EM_386
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| 76 |
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| 77 | /* relocation type for 32 bit data relocation */
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| 78 | #define R_DATA_32 R_386_32
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| 79 | #define R_DATA_PTR R_386_32
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| 80 | #define R_JMP_SLOT R_386_JMP_SLOT
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| 81 | #define R_COPY R_386_COPY
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| 82 |
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| 83 | #define ELF_START_ADDR 0x08048000
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| 84 | #define ELF_PAGE_SIZE 0x1000
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| 85 |
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| 86 | /******************************************************/
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| 87 | #else /* ! TARGET_DEFS_ONLY */
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| 88 | /******************************************************/
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| 89 | #include "tcc.h"
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| 90 |
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| 91 | ST_DATA const int reg_classes[NB_REGS] = {
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| 92 | /* eax */ RC_INT | RC_EAX,
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| 93 | /* ecx */ RC_INT | RC_ECX,
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| 94 | /* edx */ RC_INT | RC_EDX,
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| 95 | /* st0 */ RC_FLOAT | RC_ST0,
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| 96 | };
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| 97 |
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| 98 | static unsigned long func_sub_sp_offset;
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| 99 | static int func_ret_sub;
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| 100 | #ifdef CONFIG_TCC_BCHECK
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| 101 | static unsigned long func_bound_offset;
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| 102 | #endif
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| 103 |
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| 104 | /* XXX: make it faster ? */
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| 105 | ST_FUNC void g(int c)
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| 106 | {
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| 107 | int ind1;
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| 108 | ind1 = ind + 1;
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| 109 | if (ind1 > cur_text_section->data_allocated)
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| 110 | section_realloc(cur_text_section, ind1);
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| 111 | cur_text_section->data[ind] = c;
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| 112 | ind = ind1;
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| 113 | }
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| 114 |
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| 115 | ST_FUNC void o(unsigned int c)
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| 116 | {
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| 117 | while (c) {
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| 118 | g(c);
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| 119 | c = c >> 8;
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| 120 | }
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| 121 | }
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| 122 |
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| 123 | ST_FUNC void gen_le16(int v)
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| 124 | {
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| 125 | g(v);
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| 126 | g(v >> 8);
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| 127 | }
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| 128 |
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| 129 | ST_FUNC void gen_le32(int c)
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| 130 | {
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| 131 | g(c);
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| 132 | g(c >> 8);
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| 133 | g(c >> 16);
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| 134 | g(c >> 24);
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| 135 | }
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| 136 |
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| 137 | /* output a symbol and patch all calls to it */
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| 138 | ST_FUNC void gsym_addr(int t, int a)
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| 139 | {
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| 140 | int n, *ptr;
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| 141 | while (t) {
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| 142 | ptr = (int *)(cur_text_section->data + t);
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| 143 | n = *ptr; /* next value */
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| 144 | *ptr = a - t - 4;
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| 145 | t = n;
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | ST_FUNC void gsym(int t)
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| 150 | {
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| 151 | gsym_addr(t, ind);
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| 152 | }
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| 153 |
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| 154 | /* psym is used to put an instruction with a data field which is a
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| 155 | reference to a symbol. It is in fact the same as oad ! */
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| 156 | #define psym oad
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| 157 |
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| 158 | /* instruction + 4 bytes data. Return the address of the data */
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| 159 | ST_FUNC int oad(int c, int s)
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| 160 | {
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| 161 | int ind1;
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| 162 |
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| 163 | o(c);
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| 164 | ind1 = ind + 4;
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| 165 | if (ind1 > cur_text_section->data_allocated)
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| 166 | section_realloc(cur_text_section, ind1);
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| 167 | *(int *)(cur_text_section->data + ind) = s;
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| 168 | s = ind;
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| 169 | ind = ind1;
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| 170 | return s;
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| 171 | }
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| 172 |
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| 173 | /* output constant with relocation if 'r & VT_SYM' is true */
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| 174 | ST_FUNC void gen_addr32(int r, Sym *sym, int c)
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| 175 | {
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| 176 | if (r & VT_SYM)
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| 177 | greloc(cur_text_section, sym, ind, R_386_32);
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| 178 | gen_le32(c);
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| 179 | }
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| 180 |
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| 181 | ST_FUNC void gen_addrpc32(int r, Sym *sym, int c)
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| 182 | {
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| 183 | if (r & VT_SYM)
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| 184 | greloc(cur_text_section, sym, ind, R_386_PC32);
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| 185 | gen_le32(c - 4);
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| 186 | }
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| 187 |
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| 188 | /* generate a modrm reference. 'op_reg' contains the addtionnal 3
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| 189 | opcode bits */
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| 190 | static void gen_modrm(int op_reg, int r, Sym *sym, int c)
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| 191 | {
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| 192 | op_reg = op_reg << 3;
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| 193 | if ((r & VT_VALMASK) == VT_CONST) {
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| 194 | /* constant memory reference */
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| 195 | o(0x05 | op_reg);
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| 196 | gen_addr32(r, sym, c);
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| 197 | } else if ((r & VT_VALMASK) == VT_LOCAL) {
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| 198 | /* currently, we use only ebp as base */
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| 199 | if (c == (char)c) {
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| 200 | /* short reference */
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| 201 | o(0x45 | op_reg);
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| 202 | g(c);
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| 203 | } else {
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| 204 | oad(0x85 | op_reg, c);
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| 205 | }
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| 206 | } else {
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| 207 | g(0x00 | op_reg | (r & VT_VALMASK));
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| 208 | }
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| 209 | }
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| 210 |
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| 211 | /* load 'r' from value 'sv' */
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| 212 | ST_FUNC void load(int r, SValue *sv)
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| 213 | {
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| 214 | int v, t, ft, fc, fr;
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| 215 | SValue v1;
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| 216 |
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| 217 | #ifdef TCC_TARGET_PE
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| 218 | SValue v2;
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| 219 | sv = pe_getimport(sv, &v2);
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| 220 | #endif
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| 221 |
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| 222 | fr = sv->r;
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| 223 | ft = sv->type.t;
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| 224 | fc = sv->c.ul;
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| 225 |
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| 226 | v = fr & VT_VALMASK;
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| 227 | if (fr & VT_LVAL) {
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| 228 | if (v == VT_LLOCAL) {
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| 229 | v1.type.t = VT_INT;
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| 230 | v1.r = VT_LOCAL | VT_LVAL;
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| 231 | v1.c.ul = fc;
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| 232 | fr = r;
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| 233 | if (!(reg_classes[fr] & RC_INT))
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| 234 | fr = get_reg(RC_INT);
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| 235 | load(fr, &v1);
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| 236 | }
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| 237 | if ((ft & VT_BTYPE) == VT_FLOAT) {
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| 238 | o(0xd9); /* flds */
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| 239 | r = 0;
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| 240 | } else if ((ft & VT_BTYPE) == VT_DOUBLE) {
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| 241 | o(0xdd); /* fldl */
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| 242 | r = 0;
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| 243 | } else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
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| 244 | o(0xdb); /* fldt */
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| 245 | r = 5;
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| 246 | } else if ((ft & VT_TYPE) == VT_BYTE) {
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| 247 | o(0xbe0f); /* movsbl */
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| 248 | } else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED)) {
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| 249 | o(0xb60f); /* movzbl */
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| 250 | } else if ((ft & VT_TYPE) == VT_SHORT) {
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| 251 | o(0xbf0f); /* movswl */
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| 252 | } else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED)) {
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| 253 | o(0xb70f); /* movzwl */
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| 254 | } else {
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| 255 | o(0x8b); /* movl */
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| 256 | }
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| 257 | gen_modrm(r, fr, sv->sym, fc);
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| 258 | } else {
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| 259 | if (v == VT_CONST) {
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| 260 | o(0xb8 + r); /* mov $xx, r */
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| 261 | gen_addr32(fr, sv->sym, fc);
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| 262 | } else if (v == VT_LOCAL) {
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| 263 | if (fc) {
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| 264 | o(0x8d); /* lea xxx(%ebp), r */
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| 265 | gen_modrm(r, VT_LOCAL, sv->sym, fc);
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| 266 | } else {
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| 267 | o(0x89);
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| 268 | o(0xe8 + r); /* mov %ebp, r */
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| 269 | }
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| 270 | } else if (v == VT_CMP) {
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| 271 | oad(0xb8 + r, 0); /* mov $0, r */
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| 272 | o(0x0f); /* setxx %br */
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| 273 | o(fc);
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| 274 | o(0xc0 + r);
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| 275 | } else if (v == VT_JMP || v == VT_JMPI) {
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| 276 | t = v & 1;
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| 277 | oad(0xb8 + r, t); /* mov $1, r */
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| 278 | o(0x05eb); /* jmp after */
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| 279 | gsym(fc);
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| 280 | oad(0xb8 + r, t ^ 1); /* mov $0, r */
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| 281 | } else if (v != r) {
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| 282 | o(0x89);
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| 283 | o(0xc0 + r + v * 8); /* mov v, r */
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| 284 | }
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| 285 | }
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| 286 | }
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| 287 |
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| 288 | /* store register 'r' in lvalue 'v' */
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| 289 | ST_FUNC void store(int r, SValue *v)
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| 290 | {
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| 291 | int fr, bt, ft, fc;
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| 292 |
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| 293 | #ifdef TCC_TARGET_PE
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| 294 | SValue v2;
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| 295 | v = pe_getimport(v, &v2);
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| 296 | #endif
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| 297 |
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| 298 | ft = v->type.t;
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| 299 | fc = v->c.ul;
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| 300 | fr = v->r & VT_VALMASK;
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| 301 | bt = ft & VT_BTYPE;
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| 302 | /* XXX: incorrect if float reg to reg */
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| 303 | if (bt == VT_FLOAT) {
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| 304 | o(0xd9); /* fsts */
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| 305 | r = 2;
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| 306 | } else if (bt == VT_DOUBLE) {
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| 307 | o(0xdd); /* fstpl */
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| 308 | r = 2;
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| 309 | } else if (bt == VT_LDOUBLE) {
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| 310 | o(0xc0d9); /* fld %st(0) */
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| 311 | o(0xdb); /* fstpt */
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| 312 | r = 7;
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| 313 | } else {
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| 314 | if (bt == VT_SHORT)
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| 315 | o(0x66);
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| 316 | if (bt == VT_BYTE || bt == VT_BOOL)
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| 317 | o(0x88);
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| 318 | else
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| 319 | o(0x89);
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| 320 | }
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| 321 | if (fr == VT_CONST ||
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| 322 | fr == VT_LOCAL ||
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| 323 | (v->r & VT_LVAL)) {
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| 324 | gen_modrm(r, v->r, v->sym, fc);
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| 325 | } else if (fr != r) {
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| 326 | o(0xc0 + fr + r * 8); /* mov r, fr */
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| 327 | }
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| 328 | }
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| 329 |
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| 330 | static void gadd_sp(int val)
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| 331 | {
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| 332 | if (val == (char)val) {
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| 333 | o(0xc483);
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| 334 | g(val);
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| 335 | } else {
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| 336 | oad(0xc481, val); /* add $xxx, %esp */
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| 337 | }
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| 338 | }
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| 339 |
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| 340 | /* 'is_jmp' is '1' if it is a jump */
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| 341 | static void gcall_or_jmp(int is_jmp)
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| 342 | {
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| 343 | int r;
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| 344 | if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
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| 345 | /* constant case */
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| 346 | if (vtop->r & VT_SYM) {
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| 347 | /* relocation case */
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| 348 | greloc(cur_text_section, vtop->sym,
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| 349 | ind + 1, R_386_PC32);
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| 350 | } else {
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| 351 | /* put an empty PC32 relocation */
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| 352 | put_elf_reloc(symtab_section, cur_text_section,
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| 353 | ind + 1, R_386_PC32, 0);
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| 354 | }
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| 355 | oad(0xe8 + is_jmp, vtop->c.ul - 4); /* call/jmp im */
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| 356 | } else {
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| 357 | /* otherwise, indirect call */
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| 358 | r = gv(RC_INT);
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| 359 | o(0xff); /* call/jmp *r */
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| 360 | o(0xd0 + r + (is_jmp << 4));
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| 361 | }
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| 362 | }
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| 363 |
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| 364 | static uint8_t fastcall_regs[3] = { TREG_EAX, TREG_EDX, TREG_ECX };
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| 365 | static uint8_t fastcallw_regs[2] = { TREG_ECX, TREG_EDX };
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| 366 |
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| 367 | /* Generate function call. The function address is pushed first, then
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| 368 | all the parameters in call order. This functions pops all the
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| 369 | parameters and the function address. */
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| 370 | ST_FUNC void gfunc_call(int nb_args)
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| 371 | {
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| 372 | int size, align, r, args_size, i, func_call;
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| 373 | Sym *func_sym;
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| 374 |
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| 375 | args_size = 0;
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| 376 | for(i = 0;i < nb_args; i++) {
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| 377 | if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
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| 378 | size = type_size(&vtop->type, &align);
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| 379 | /* align to stack align size */
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| 380 | size = (size + 3) & ~3;
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| 381 | /* allocate the necessary size on stack */
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| 382 | oad(0xec81, size); /* sub $xxx, %esp */
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| 383 | /* generate structure store */
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| 384 | r = get_reg(RC_INT);
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| 385 | o(0x89); /* mov %esp, r */
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| 386 | o(0xe0 + r);
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| 387 | vset(&vtop->type, r | VT_LVAL, 0);
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| 388 | vswap();
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| 389 | vstore();
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| 390 | args_size += size;
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| 391 | } else if (is_float(vtop->type.t)) {
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| 392 | gv(RC_FLOAT); /* only one float register */
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| 393 | if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
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| 394 | size = 4;
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| 395 | else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
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| 396 | size = 8;
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| 397 | else
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| 398 | size = 12;
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| 399 | oad(0xec81, size); /* sub $xxx, %esp */
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| 400 | if (size == 12)
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| 401 | o(0x7cdb);
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| 402 | else
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| 403 | o(0x5cd9 + size - 4); /* fstp[s|l] 0(%esp) */
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| 404 | g(0x24);
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| 405 | g(0x00);
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| 406 | args_size += size;
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| 407 | } else {
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| 408 | /* simple type (currently always same size) */
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| 409 | /* XXX: implicit cast ? */
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| 410 | r = gv(RC_INT);
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| 411 | if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
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| 412 | size = 8;
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| 413 | o(0x50 + vtop->r2); /* push r */
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| 414 | } else {
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| 415 | size = 4;
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| 416 | }
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| 417 | o(0x50 + r); /* push r */
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| 418 | args_size += size;
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| 419 | }
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| 420 | vtop--;
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| 421 | }
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| 422 | save_regs(0); /* save used temporary registers */
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| 423 | func_sym = vtop->type.ref;
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| 424 | func_call = FUNC_CALL(func_sym->r);
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| 425 | /* fast call case */
|
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| 426 | if ((func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) ||
|
---|
| 427 | func_call == FUNC_FASTCALLW) {
|
---|
| 428 | int fastcall_nb_regs;
|
---|
| 429 | uint8_t *fastcall_regs_ptr;
|
---|
| 430 | if (func_call == FUNC_FASTCALLW) {
|
---|
| 431 | fastcall_regs_ptr = fastcallw_regs;
|
---|
| 432 | fastcall_nb_regs = 2;
|
---|
| 433 | } else {
|
---|
| 434 | fastcall_regs_ptr = fastcall_regs;
|
---|
| 435 | fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
|
---|
| 436 | }
|
---|
| 437 | for(i = 0;i < fastcall_nb_regs; i++) {
|
---|
| 438 | if (args_size <= 0)
|
---|
| 439 | break;
|
---|
| 440 | o(0x58 + fastcall_regs_ptr[i]); /* pop r */
|
---|
| 441 | /* XXX: incorrect for struct/floats */
|
---|
| 442 | args_size -= 4;
|
---|
| 443 | }
|
---|
| 444 | }
|
---|
| 445 | gcall_or_jmp(0);
|
---|
| 446 |
|
---|
| 447 | #ifdef TCC_TARGET_PE
|
---|
| 448 | if ((func_sym->type.t & VT_BTYPE) == VT_STRUCT)
|
---|
| 449 | args_size -= 4;
|
---|
| 450 | #endif
|
---|
| 451 | if (args_size && func_call != FUNC_STDCALL)
|
---|
| 452 | gadd_sp(args_size);
|
---|
| 453 | vtop--;
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | #ifdef TCC_TARGET_PE
|
---|
| 457 | #define FUNC_PROLOG_SIZE 10
|
---|
| 458 | #else
|
---|
| 459 | #define FUNC_PROLOG_SIZE 9
|
---|
| 460 | #endif
|
---|
| 461 |
|
---|
| 462 | /* generate function prolog of type 't' */
|
---|
| 463 | ST_FUNC void gfunc_prolog(CType *func_type)
|
---|
| 464 | {
|
---|
| 465 | int addr, align, size, func_call, fastcall_nb_regs;
|
---|
| 466 | int param_index, param_addr;
|
---|
| 467 | uint8_t *fastcall_regs_ptr;
|
---|
| 468 | Sym *sym;
|
---|
| 469 | CType *type;
|
---|
| 470 |
|
---|
| 471 | sym = func_type->ref;
|
---|
| 472 | func_call = FUNC_CALL(sym->r);
|
---|
| 473 | addr = 8;
|
---|
| 474 | loc = 0;
|
---|
| 475 | func_vc = 0;
|
---|
| 476 |
|
---|
| 477 | if (func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) {
|
---|
| 478 | fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
|
---|
| 479 | fastcall_regs_ptr = fastcall_regs;
|
---|
| 480 | } else if (func_call == FUNC_FASTCALLW) {
|
---|
| 481 | fastcall_nb_regs = 2;
|
---|
| 482 | fastcall_regs_ptr = fastcallw_regs;
|
---|
| 483 | } else {
|
---|
| 484 | fastcall_nb_regs = 0;
|
---|
| 485 | fastcall_regs_ptr = NULL;
|
---|
| 486 | }
|
---|
| 487 | param_index = 0;
|
---|
| 488 |
|
---|
| 489 | ind += FUNC_PROLOG_SIZE;
|
---|
| 490 | func_sub_sp_offset = ind;
|
---|
| 491 | /* if the function returns a structure, then add an
|
---|
| 492 | implicit pointer parameter */
|
---|
| 493 | func_vt = sym->type;
|
---|
| 494 | if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
|
---|
| 495 | /* XXX: fastcall case ? */
|
---|
| 496 | func_vc = addr;
|
---|
| 497 | addr += 4;
|
---|
| 498 | param_index++;
|
---|
| 499 | }
|
---|
| 500 | /* define parameters */
|
---|
| 501 | while ((sym = sym->next) != NULL) {
|
---|
| 502 | type = &sym->type;
|
---|
| 503 | size = type_size(type, &align);
|
---|
| 504 | size = (size + 3) & ~3;
|
---|
| 505 | #ifdef FUNC_STRUCT_PARAM_AS_PTR
|
---|
| 506 | /* structs are passed as pointer */
|
---|
| 507 | if ((type->t & VT_BTYPE) == VT_STRUCT) {
|
---|
| 508 | size = 4;
|
---|
| 509 | }
|
---|
| 510 | #endif
|
---|
| 511 | if (param_index < fastcall_nb_regs) {
|
---|
| 512 | /* save FASTCALL register */
|
---|
| 513 | loc -= 4;
|
---|
| 514 | o(0x89); /* movl */
|
---|
| 515 | gen_modrm(fastcall_regs_ptr[param_index], VT_LOCAL, NULL, loc);
|
---|
| 516 | param_addr = loc;
|
---|
| 517 | } else {
|
---|
| 518 | param_addr = addr;
|
---|
| 519 | addr += size;
|
---|
| 520 | }
|
---|
| 521 | sym_push(sym->v & ~SYM_FIELD, type,
|
---|
| 522 | VT_LOCAL | lvalue_type(type->t), param_addr);
|
---|
| 523 | param_index++;
|
---|
| 524 | }
|
---|
| 525 | func_ret_sub = 0;
|
---|
| 526 | /* pascal type call ? */
|
---|
| 527 | if (func_call == FUNC_STDCALL)
|
---|
| 528 | func_ret_sub = addr - 8;
|
---|
| 529 | #ifdef TCC_TARGET_PE
|
---|
| 530 | else if (func_vc)
|
---|
| 531 | func_ret_sub = 4;
|
---|
| 532 | #endif
|
---|
| 533 |
|
---|
| 534 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 535 | /* leave some room for bound checking code */
|
---|
| 536 | if (tcc_state->do_bounds_check) {
|
---|
| 537 | oad(0xb8, 0); /* lbound section pointer */
|
---|
| 538 | oad(0xb8, 0); /* call to function */
|
---|
| 539 | func_bound_offset = lbounds_section->data_offset;
|
---|
| 540 | }
|
---|
| 541 | #endif
|
---|
| 542 | }
|
---|
| 543 |
|
---|
| 544 | /* generate function epilog */
|
---|
| 545 | ST_FUNC void gfunc_epilog(void)
|
---|
| 546 | {
|
---|
| 547 | int v, saved_ind;
|
---|
| 548 |
|
---|
| 549 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 550 | if (tcc_state->do_bounds_check
|
---|
| 551 | && func_bound_offset != lbounds_section->data_offset) {
|
---|
| 552 | int saved_ind;
|
---|
| 553 | int *bounds_ptr;
|
---|
| 554 | Sym *sym, *sym_data;
|
---|
| 555 | /* add end of table info */
|
---|
| 556 | bounds_ptr = section_ptr_add(lbounds_section, sizeof(int));
|
---|
| 557 | *bounds_ptr = 0;
|
---|
| 558 | /* generate bound local allocation */
|
---|
| 559 | saved_ind = ind;
|
---|
| 560 | ind = func_sub_sp_offset;
|
---|
| 561 | sym_data = get_sym_ref(&char_pointer_type, lbounds_section,
|
---|
| 562 | func_bound_offset, lbounds_section->data_offset);
|
---|
| 563 | greloc(cur_text_section, sym_data,
|
---|
| 564 | ind + 1, R_386_32);
|
---|
| 565 | oad(0xb8, 0); /* mov %eax, xxx */
|
---|
| 566 | sym = external_global_sym(TOK___bound_local_new, &func_old_type, 0);
|
---|
| 567 | greloc(cur_text_section, sym,
|
---|
| 568 | ind + 1, R_386_PC32);
|
---|
| 569 | oad(0xe8, -4);
|
---|
| 570 | ind = saved_ind;
|
---|
| 571 | /* generate bound check local freeing */
|
---|
| 572 | o(0x5250); /* save returned value, if any */
|
---|
| 573 | greloc(cur_text_section, sym_data,
|
---|
| 574 | ind + 1, R_386_32);
|
---|
| 575 | oad(0xb8, 0); /* mov %eax, xxx */
|
---|
| 576 | sym = external_global_sym(TOK___bound_local_delete, &func_old_type, 0);
|
---|
| 577 | greloc(cur_text_section, sym,
|
---|
| 578 | ind + 1, R_386_PC32);
|
---|
| 579 | oad(0xe8, -4);
|
---|
| 580 | o(0x585a); /* restore returned value, if any */
|
---|
| 581 | }
|
---|
| 582 | #endif
|
---|
| 583 | o(0xc9); /* leave */
|
---|
| 584 | if (func_ret_sub == 0) {
|
---|
| 585 | o(0xc3); /* ret */
|
---|
| 586 | } else {
|
---|
| 587 | o(0xc2); /* ret n */
|
---|
| 588 | g(func_ret_sub);
|
---|
| 589 | g(func_ret_sub >> 8);
|
---|
| 590 | }
|
---|
| 591 | /* align local size to word & save local variables */
|
---|
| 592 |
|
---|
| 593 | v = (-loc + 3) & -4;
|
---|
| 594 | saved_ind = ind;
|
---|
| 595 | ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
|
---|
| 596 | #ifdef TCC_TARGET_PE
|
---|
| 597 | if (v >= 4096) {
|
---|
| 598 | Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
|
---|
| 599 | oad(0xb8, v); /* mov stacksize, %eax */
|
---|
| 600 | oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
|
---|
| 601 | greloc(cur_text_section, sym, ind-4, R_386_PC32);
|
---|
| 602 | } else
|
---|
| 603 | #endif
|
---|
| 604 | {
|
---|
| 605 | o(0xe58955); /* push %ebp, mov %esp, %ebp */
|
---|
| 606 | o(0xec81); /* sub esp, stacksize */
|
---|
| 607 | gen_le32(v);
|
---|
| 608 | #if FUNC_PROLOG_SIZE == 10
|
---|
| 609 | o(0x90); /* adjust to FUNC_PROLOG_SIZE */
|
---|
| 610 | #endif
|
---|
| 611 | }
|
---|
| 612 | ind = saved_ind;
|
---|
| 613 | }
|
---|
| 614 |
|
---|
| 615 | /* generate a jump to a label */
|
---|
| 616 | ST_FUNC int gjmp(int t)
|
---|
| 617 | {
|
---|
| 618 | return psym(0xe9, t);
|
---|
| 619 | }
|
---|
| 620 |
|
---|
| 621 | /* generate a jump to a fixed address */
|
---|
| 622 | ST_FUNC void gjmp_addr(int a)
|
---|
| 623 | {
|
---|
| 624 | int r;
|
---|
| 625 | r = a - ind - 2;
|
---|
| 626 | if (r == (char)r) {
|
---|
| 627 | g(0xeb);
|
---|
| 628 | g(r);
|
---|
| 629 | } else {
|
---|
| 630 | oad(0xe9, a - ind - 5);
|
---|
| 631 | }
|
---|
| 632 | }
|
---|
| 633 |
|
---|
| 634 | /* generate a test. set 'inv' to invert test. Stack entry is popped */
|
---|
| 635 | ST_FUNC int gtst(int inv, int t)
|
---|
| 636 | {
|
---|
| 637 | int v, *p;
|
---|
| 638 |
|
---|
| 639 | v = vtop->r & VT_VALMASK;
|
---|
| 640 | if (v == VT_CMP) {
|
---|
| 641 | /* fast case : can jump directly since flags are set */
|
---|
| 642 | g(0x0f);
|
---|
| 643 | t = psym((vtop->c.i - 16) ^ inv, t);
|
---|
| 644 | } else if (v == VT_JMP || v == VT_JMPI) {
|
---|
| 645 | /* && or || optimization */
|
---|
| 646 | if ((v & 1) == inv) {
|
---|
| 647 | /* insert vtop->c jump list in t */
|
---|
| 648 | p = &vtop->c.i;
|
---|
| 649 | while (*p != 0)
|
---|
| 650 | p = (int *)(cur_text_section->data + *p);
|
---|
| 651 | *p = t;
|
---|
| 652 | t = vtop->c.i;
|
---|
| 653 | } else {
|
---|
| 654 | t = gjmp(t);
|
---|
| 655 | gsym(vtop->c.i);
|
---|
| 656 | }
|
---|
| 657 | } else {
|
---|
| 658 | if (is_float(vtop->type.t) ||
|
---|
| 659 | (vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
---|
| 660 | vpushi(0);
|
---|
| 661 | gen_op(TOK_NE);
|
---|
| 662 | }
|
---|
| 663 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
| 664 | /* constant jmp optimization */
|
---|
| 665 | if ((vtop->c.i != 0) != inv)
|
---|
| 666 | t = gjmp(t);
|
---|
| 667 | } else {
|
---|
| 668 | v = gv(RC_INT);
|
---|
| 669 | o(0x85);
|
---|
| 670 | o(0xc0 + v * 9);
|
---|
| 671 | g(0x0f);
|
---|
| 672 | t = psym(0x85 ^ inv, t);
|
---|
| 673 | }
|
---|
| 674 | }
|
---|
| 675 | vtop--;
|
---|
| 676 | return t;
|
---|
| 677 | }
|
---|
| 678 |
|
---|
| 679 | /* generate an integer binary operation */
|
---|
| 680 | ST_FUNC void gen_opi(int op)
|
---|
| 681 | {
|
---|
| 682 | int r, fr, opc, c;
|
---|
| 683 |
|
---|
| 684 | switch(op) {
|
---|
| 685 | case '+':
|
---|
| 686 | case TOK_ADDC1: /* add with carry generation */
|
---|
| 687 | opc = 0;
|
---|
| 688 | gen_op8:
|
---|
| 689 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
| 690 | /* constant case */
|
---|
| 691 | vswap();
|
---|
| 692 | r = gv(RC_INT);
|
---|
| 693 | vswap();
|
---|
| 694 | c = vtop->c.i;
|
---|
| 695 | if (c == (char)c) {
|
---|
| 696 | /* generate inc and dec for smaller code */
|
---|
| 697 | if (c==1 && opc==0) {
|
---|
| 698 | o (0x40 | r); // inc
|
---|
| 699 | } else if (c==1 && opc==5) {
|
---|
| 700 | o (0x48 | r); // dec
|
---|
| 701 | } else {
|
---|
| 702 | o(0x83);
|
---|
| 703 | o(0xc0 | (opc << 3) | r);
|
---|
| 704 | g(c);
|
---|
| 705 | }
|
---|
| 706 | } else {
|
---|
| 707 | o(0x81);
|
---|
| 708 | oad(0xc0 | (opc << 3) | r, c);
|
---|
| 709 | }
|
---|
| 710 | } else {
|
---|
| 711 | gv2(RC_INT, RC_INT);
|
---|
| 712 | r = vtop[-1].r;
|
---|
| 713 | fr = vtop[0].r;
|
---|
| 714 | o((opc << 3) | 0x01);
|
---|
| 715 | o(0xc0 + r + fr * 8);
|
---|
| 716 | }
|
---|
| 717 | vtop--;
|
---|
| 718 | if (op >= TOK_ULT && op <= TOK_GT) {
|
---|
| 719 | vtop->r = VT_CMP;
|
---|
| 720 | vtop->c.i = op;
|
---|
| 721 | }
|
---|
| 722 | break;
|
---|
| 723 | case '-':
|
---|
| 724 | case TOK_SUBC1: /* sub with carry generation */
|
---|
| 725 | opc = 5;
|
---|
| 726 | goto gen_op8;
|
---|
| 727 | case TOK_ADDC2: /* add with carry use */
|
---|
| 728 | opc = 2;
|
---|
| 729 | goto gen_op8;
|
---|
| 730 | case TOK_SUBC2: /* sub with carry use */
|
---|
| 731 | opc = 3;
|
---|
| 732 | goto gen_op8;
|
---|
| 733 | case '&':
|
---|
| 734 | opc = 4;
|
---|
| 735 | goto gen_op8;
|
---|
| 736 | case '^':
|
---|
| 737 | opc = 6;
|
---|
| 738 | goto gen_op8;
|
---|
| 739 | case '|':
|
---|
| 740 | opc = 1;
|
---|
| 741 | goto gen_op8;
|
---|
| 742 | case '*':
|
---|
| 743 | gv2(RC_INT, RC_INT);
|
---|
| 744 | r = vtop[-1].r;
|
---|
| 745 | fr = vtop[0].r;
|
---|
| 746 | vtop--;
|
---|
| 747 | o(0xaf0f); /* imul fr, r */
|
---|
| 748 | o(0xc0 + fr + r * 8);
|
---|
| 749 | break;
|
---|
| 750 | case TOK_SHL:
|
---|
| 751 | opc = 4;
|
---|
| 752 | goto gen_shift;
|
---|
| 753 | case TOK_SHR:
|
---|
| 754 | opc = 5;
|
---|
| 755 | goto gen_shift;
|
---|
| 756 | case TOK_SAR:
|
---|
| 757 | opc = 7;
|
---|
| 758 | gen_shift:
|
---|
| 759 | opc = 0xc0 | (opc << 3);
|
---|
| 760 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
| 761 | /* constant case */
|
---|
| 762 | vswap();
|
---|
| 763 | r = gv(RC_INT);
|
---|
| 764 | vswap();
|
---|
| 765 | c = vtop->c.i & 0x1f;
|
---|
| 766 | o(0xc1); /* shl/shr/sar $xxx, r */
|
---|
| 767 | o(opc | r);
|
---|
| 768 | g(c);
|
---|
| 769 | } else {
|
---|
| 770 | /* we generate the shift in ecx */
|
---|
| 771 | gv2(RC_INT, RC_ECX);
|
---|
| 772 | r = vtop[-1].r;
|
---|
| 773 | o(0xd3); /* shl/shr/sar %cl, r */
|
---|
| 774 | o(opc | r);
|
---|
| 775 | }
|
---|
| 776 | vtop--;
|
---|
| 777 | break;
|
---|
| 778 | case '/':
|
---|
| 779 | case TOK_UDIV:
|
---|
| 780 | case TOK_PDIV:
|
---|
| 781 | case '%':
|
---|
| 782 | case TOK_UMOD:
|
---|
| 783 | case TOK_UMULL:
|
---|
| 784 | /* first operand must be in eax */
|
---|
| 785 | /* XXX: need better constraint for second operand */
|
---|
| 786 | gv2(RC_EAX, RC_ECX);
|
---|
| 787 | r = vtop[-1].r;
|
---|
| 788 | fr = vtop[0].r;
|
---|
| 789 | vtop--;
|
---|
| 790 | save_reg(TREG_EDX);
|
---|
| 791 | if (op == TOK_UMULL) {
|
---|
| 792 | o(0xf7); /* mul fr */
|
---|
| 793 | o(0xe0 + fr);
|
---|
| 794 | vtop->r2 = TREG_EDX;
|
---|
| 795 | r = TREG_EAX;
|
---|
| 796 | } else {
|
---|
| 797 | if (op == TOK_UDIV || op == TOK_UMOD) {
|
---|
| 798 | o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
|
---|
| 799 | o(0xf0 + fr);
|
---|
| 800 | } else {
|
---|
| 801 | o(0xf799); /* cltd, idiv fr, %eax */
|
---|
| 802 | o(0xf8 + fr);
|
---|
| 803 | }
|
---|
| 804 | if (op == '%' || op == TOK_UMOD)
|
---|
| 805 | r = TREG_EDX;
|
---|
| 806 | else
|
---|
| 807 | r = TREG_EAX;
|
---|
| 808 | }
|
---|
| 809 | vtop->r = r;
|
---|
| 810 | break;
|
---|
| 811 | default:
|
---|
| 812 | opc = 7;
|
---|
| 813 | goto gen_op8;
|
---|
| 814 | }
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | /* generate a floating point operation 'v = t1 op t2' instruction. The
|
---|
| 818 | two operands are guaranted to have the same floating point type */
|
---|
| 819 | /* XXX: need to use ST1 too */
|
---|
| 820 | ST_FUNC void gen_opf(int op)
|
---|
| 821 | {
|
---|
| 822 | int a, ft, fc, swapped, r;
|
---|
| 823 |
|
---|
| 824 | /* convert constants to memory references */
|
---|
| 825 | if ((vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
|
---|
| 826 | vswap();
|
---|
| 827 | gv(RC_FLOAT);
|
---|
| 828 | vswap();
|
---|
| 829 | }
|
---|
| 830 | if ((vtop[0].r & (VT_VALMASK | VT_LVAL)) == VT_CONST)
|
---|
| 831 | gv(RC_FLOAT);
|
---|
| 832 |
|
---|
| 833 | /* must put at least one value in the floating point register */
|
---|
| 834 | if ((vtop[-1].r & VT_LVAL) &&
|
---|
| 835 | (vtop[0].r & VT_LVAL)) {
|
---|
| 836 | vswap();
|
---|
| 837 | gv(RC_FLOAT);
|
---|
| 838 | vswap();
|
---|
| 839 | }
|
---|
| 840 | swapped = 0;
|
---|
| 841 | /* swap the stack if needed so that t1 is the register and t2 is
|
---|
| 842 | the memory reference */
|
---|
| 843 | if (vtop[-1].r & VT_LVAL) {
|
---|
| 844 | vswap();
|
---|
| 845 | swapped = 1;
|
---|
| 846 | }
|
---|
| 847 | if (op >= TOK_ULT && op <= TOK_GT) {
|
---|
| 848 | /* load on stack second operand */
|
---|
| 849 | load(TREG_ST0, vtop);
|
---|
| 850 | save_reg(TREG_EAX); /* eax is used by FP comparison code */
|
---|
| 851 | if (op == TOK_GE || op == TOK_GT)
|
---|
| 852 | swapped = !swapped;
|
---|
| 853 | else if (op == TOK_EQ || op == TOK_NE)
|
---|
| 854 | swapped = 0;
|
---|
| 855 | if (swapped)
|
---|
| 856 | o(0xc9d9); /* fxch %st(1) */
|
---|
| 857 | o(0xe9da); /* fucompp */
|
---|
| 858 | o(0xe0df); /* fnstsw %ax */
|
---|
| 859 | if (op == TOK_EQ) {
|
---|
| 860 | o(0x45e480); /* and $0x45, %ah */
|
---|
| 861 | o(0x40fC80); /* cmp $0x40, %ah */
|
---|
| 862 | } else if (op == TOK_NE) {
|
---|
| 863 | o(0x45e480); /* and $0x45, %ah */
|
---|
| 864 | o(0x40f480); /* xor $0x40, %ah */
|
---|
| 865 | op = TOK_NE;
|
---|
| 866 | } else if (op == TOK_GE || op == TOK_LE) {
|
---|
| 867 | o(0x05c4f6); /* test $0x05, %ah */
|
---|
| 868 | op = TOK_EQ;
|
---|
| 869 | } else {
|
---|
| 870 | o(0x45c4f6); /* test $0x45, %ah */
|
---|
| 871 | op = TOK_EQ;
|
---|
| 872 | }
|
---|
| 873 | vtop--;
|
---|
| 874 | vtop->r = VT_CMP;
|
---|
| 875 | vtop->c.i = op;
|
---|
| 876 | } else {
|
---|
| 877 | /* no memory reference possible for long double operations */
|
---|
| 878 | if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
|
---|
| 879 | load(TREG_ST0, vtop);
|
---|
| 880 | swapped = !swapped;
|
---|
| 881 | }
|
---|
| 882 |
|
---|
| 883 | switch(op) {
|
---|
| 884 | default:
|
---|
| 885 | case '+':
|
---|
| 886 | a = 0;
|
---|
| 887 | break;
|
---|
| 888 | case '-':
|
---|
| 889 | a = 4;
|
---|
| 890 | if (swapped)
|
---|
| 891 | a++;
|
---|
| 892 | break;
|
---|
| 893 | case '*':
|
---|
| 894 | a = 1;
|
---|
| 895 | break;
|
---|
| 896 | case '/':
|
---|
| 897 | a = 6;
|
---|
| 898 | if (swapped)
|
---|
| 899 | a++;
|
---|
| 900 | break;
|
---|
| 901 | }
|
---|
| 902 | ft = vtop->type.t;
|
---|
| 903 | fc = vtop->c.ul;
|
---|
| 904 | if ((ft & VT_BTYPE) == VT_LDOUBLE) {
|
---|
| 905 | o(0xde); /* fxxxp %st, %st(1) */
|
---|
| 906 | o(0xc1 + (a << 3));
|
---|
| 907 | } else {
|
---|
| 908 | /* if saved lvalue, then we must reload it */
|
---|
| 909 | r = vtop->r;
|
---|
| 910 | if ((r & VT_VALMASK) == VT_LLOCAL) {
|
---|
| 911 | SValue v1;
|
---|
| 912 | r = get_reg(RC_INT);
|
---|
| 913 | v1.type.t = VT_INT;
|
---|
| 914 | v1.r = VT_LOCAL | VT_LVAL;
|
---|
| 915 | v1.c.ul = fc;
|
---|
| 916 | load(r, &v1);
|
---|
| 917 | fc = 0;
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 | if ((ft & VT_BTYPE) == VT_DOUBLE)
|
---|
| 921 | o(0xdc);
|
---|
| 922 | else
|
---|
| 923 | o(0xd8);
|
---|
| 924 | gen_modrm(a, r, vtop->sym, fc);
|
---|
| 925 | }
|
---|
| 926 | vtop--;
|
---|
| 927 | }
|
---|
| 928 | }
|
---|
| 929 |
|
---|
| 930 | /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
|
---|
| 931 | and 'long long' cases. */
|
---|
| 932 | ST_FUNC void gen_cvt_itof(int t)
|
---|
| 933 | {
|
---|
| 934 | save_reg(TREG_ST0);
|
---|
| 935 | gv(RC_INT);
|
---|
| 936 | if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
---|
| 937 | /* signed long long to float/double/long double (unsigned case
|
---|
| 938 | is handled generically) */
|
---|
| 939 | o(0x50 + vtop->r2); /* push r2 */
|
---|
| 940 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
| 941 | o(0x242cdf); /* fildll (%esp) */
|
---|
| 942 | o(0x08c483); /* add $8, %esp */
|
---|
| 943 | } else if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
|
---|
| 944 | (VT_INT | VT_UNSIGNED)) {
|
---|
| 945 | /* unsigned int to float/double/long double */
|
---|
| 946 | o(0x6a); /* push $0 */
|
---|
| 947 | g(0x00);
|
---|
| 948 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
| 949 | o(0x242cdf); /* fildll (%esp) */
|
---|
| 950 | o(0x08c483); /* add $8, %esp */
|
---|
| 951 | } else {
|
---|
| 952 | /* int to float/double/long double */
|
---|
| 953 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
| 954 | o(0x2404db); /* fildl (%esp) */
|
---|
| 955 | o(0x04c483); /* add $4, %esp */
|
---|
| 956 | }
|
---|
| 957 | vtop->r = TREG_ST0;
|
---|
| 958 | }
|
---|
| 959 |
|
---|
| 960 | /* convert fp to int 't' type */
|
---|
| 961 | /* XXX: handle long long case */
|
---|
| 962 | ST_FUNC void gen_cvt_ftoi(int t)
|
---|
| 963 | {
|
---|
| 964 | int r, r2, size;
|
---|
| 965 | Sym *sym;
|
---|
| 966 | CType ushort_type;
|
---|
| 967 |
|
---|
| 968 | ushort_type.t = VT_SHORT | VT_UNSIGNED;
|
---|
| 969 | ushort_type.ref = 0;
|
---|
| 970 |
|
---|
| 971 | gv(RC_FLOAT);
|
---|
| 972 | if (t != VT_INT)
|
---|
| 973 | size = 8;
|
---|
| 974 | else
|
---|
| 975 | size = 4;
|
---|
| 976 |
|
---|
| 977 | o(0x2dd9); /* ldcw xxx */
|
---|
| 978 | sym = external_global_sym(TOK___tcc_int_fpu_control,
|
---|
| 979 | &ushort_type, VT_LVAL);
|
---|
| 980 | greloc(cur_text_section, sym,
|
---|
| 981 | ind, R_386_32);
|
---|
| 982 | gen_le32(0);
|
---|
| 983 |
|
---|
| 984 | oad(0xec81, size); /* sub $xxx, %esp */
|
---|
| 985 | if (size == 4)
|
---|
| 986 | o(0x1cdb); /* fistpl */
|
---|
| 987 | else
|
---|
| 988 | o(0x3cdf); /* fistpll */
|
---|
| 989 | o(0x24);
|
---|
| 990 | o(0x2dd9); /* ldcw xxx */
|
---|
| 991 | sym = external_global_sym(TOK___tcc_fpu_control,
|
---|
| 992 | &ushort_type, VT_LVAL);
|
---|
| 993 | greloc(cur_text_section, sym,
|
---|
| 994 | ind, R_386_32);
|
---|
| 995 | gen_le32(0);
|
---|
| 996 |
|
---|
| 997 | r = get_reg(RC_INT);
|
---|
| 998 | o(0x58 + r); /* pop r */
|
---|
| 999 | if (size == 8) {
|
---|
| 1000 | if (t == VT_LLONG) {
|
---|
| 1001 | vtop->r = r; /* mark reg as used */
|
---|
| 1002 | r2 = get_reg(RC_INT);
|
---|
| 1003 | o(0x58 + r2); /* pop r2 */
|
---|
| 1004 | vtop->r2 = r2;
|
---|
| 1005 | } else {
|
---|
| 1006 | o(0x04c483); /* add $4, %esp */
|
---|
| 1007 | }
|
---|
| 1008 | }
|
---|
| 1009 | vtop->r = r;
|
---|
| 1010 | }
|
---|
| 1011 |
|
---|
| 1012 | /* convert from one floating point type to another */
|
---|
| 1013 | ST_FUNC void gen_cvt_ftof(int t)
|
---|
| 1014 | {
|
---|
| 1015 | /* all we have to do on i386 is to put the float in a register */
|
---|
| 1016 | gv(RC_FLOAT);
|
---|
| 1017 | }
|
---|
| 1018 |
|
---|
| 1019 | /* computed goto support */
|
---|
| 1020 | ST_FUNC void ggoto(void)
|
---|
| 1021 | {
|
---|
| 1022 | gcall_or_jmp(1);
|
---|
| 1023 | vtop--;
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 | /* bound check support functions */
|
---|
| 1027 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 1028 |
|
---|
| 1029 | /* generate a bounded pointer addition */
|
---|
| 1030 | ST_FUNC void gen_bounded_ptr_add(void)
|
---|
| 1031 | {
|
---|
| 1032 | Sym *sym;
|
---|
| 1033 |
|
---|
| 1034 | /* prepare fast i386 function call (args in eax and edx) */
|
---|
| 1035 | gv2(RC_EAX, RC_EDX);
|
---|
| 1036 | /* save all temporary registers */
|
---|
| 1037 | vtop -= 2;
|
---|
| 1038 | save_regs(0);
|
---|
| 1039 | /* do a fast function call */
|
---|
| 1040 | sym = external_global_sym(TOK___bound_ptr_add, &func_old_type, 0);
|
---|
| 1041 | greloc(cur_text_section, sym,
|
---|
| 1042 | ind + 1, R_386_PC32);
|
---|
| 1043 | oad(0xe8, -4);
|
---|
| 1044 | /* returned pointer is in eax */
|
---|
| 1045 | vtop++;
|
---|
| 1046 | vtop->r = TREG_EAX | VT_BOUNDED;
|
---|
| 1047 | /* address of bounding function call point */
|
---|
| 1048 | vtop->c.ul = (cur_text_section->reloc->data_offset - sizeof(Elf32_Rel));
|
---|
| 1049 | }
|
---|
| 1050 |
|
---|
| 1051 | /* patch pointer addition in vtop so that pointer dereferencing is
|
---|
| 1052 | also tested */
|
---|
| 1053 | ST_FUNC void gen_bounded_ptr_deref(void)
|
---|
| 1054 | {
|
---|
| 1055 | int func;
|
---|
| 1056 | int size, align;
|
---|
| 1057 | Elf32_Rel *rel;
|
---|
| 1058 | Sym *sym;
|
---|
| 1059 |
|
---|
| 1060 | size = 0;
|
---|
| 1061 | /* XXX: put that code in generic part of tcc */
|
---|
| 1062 | if (!is_float(vtop->type.t)) {
|
---|
| 1063 | if (vtop->r & VT_LVAL_BYTE)
|
---|
| 1064 | size = 1;
|
---|
| 1065 | else if (vtop->r & VT_LVAL_SHORT)
|
---|
| 1066 | size = 2;
|
---|
| 1067 | }
|
---|
| 1068 | if (!size)
|
---|
| 1069 | size = type_size(&vtop->type, &align);
|
---|
| 1070 | switch(size) {
|
---|
| 1071 | case 1: func = TOK___bound_ptr_indir1; break;
|
---|
| 1072 | case 2: func = TOK___bound_ptr_indir2; break;
|
---|
| 1073 | case 4: func = TOK___bound_ptr_indir4; break;
|
---|
| 1074 | case 8: func = TOK___bound_ptr_indir8; break;
|
---|
| 1075 | case 12: func = TOK___bound_ptr_indir12; break;
|
---|
| 1076 | case 16: func = TOK___bound_ptr_indir16; break;
|
---|
| 1077 | default:
|
---|
| 1078 | tcc_error("unhandled size when dereferencing bounded pointer");
|
---|
| 1079 | func = 0;
|
---|
| 1080 | break;
|
---|
| 1081 | }
|
---|
| 1082 |
|
---|
| 1083 | /* patch relocation */
|
---|
| 1084 | /* XXX: find a better solution ? */
|
---|
| 1085 | rel = (Elf32_Rel *)(cur_text_section->reloc->data + vtop->c.ul);
|
---|
| 1086 | sym = external_global_sym(func, &func_old_type, 0);
|
---|
| 1087 | if (!sym->c)
|
---|
| 1088 | put_extern_sym(sym, NULL, 0, 0);
|
---|
| 1089 | rel->r_info = ELF32_R_INFO(sym->c, ELF32_R_TYPE(rel->r_info));
|
---|
| 1090 | }
|
---|
| 1091 | #endif
|
---|
| 1092 |
|
---|
| 1093 | /* end of X86 code generator */
|
---|
| 1094 | /*************************************************************/
|
---|
| 1095 | #endif
|
---|
| 1096 | /*************************************************************/
|
---|