1033 lines
28 KiB
C
1033 lines
28 KiB
C
/*
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* X86 code generator for TCC
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*
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* Copyright (c) 2001-2004 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* number of available registers */
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#define NB_REGS 4
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/* a register can belong to several classes. The classes must be
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sorted from more general to more precise (see gv2() code which does
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assumptions on it). */
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#define RC_INT 0x0001 /* generic integer register */
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#define RC_FLOAT 0x0002 /* generic float register */
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#define RC_EAX 0x0004
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#define RC_ST0 0x0008
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#define RC_ECX 0x0010
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#define RC_EDX 0x0020
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#define RC_IRET RC_EAX /* function return: integer register */
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#define RC_LRET RC_EDX /* function return: second integer register */
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#define RC_FRET RC_ST0 /* function return: float register */
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/* pretty names for the registers */
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enum {
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TREG_EAX = 0,
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TREG_ECX,
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TREG_EDX,
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TREG_ST0,
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};
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int reg_classes[NB_REGS] = {
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/* eax */ RC_INT | RC_EAX,
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/* ecx */ RC_INT | RC_ECX,
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/* edx */ RC_INT | RC_EDX,
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/* st0 */ RC_FLOAT | RC_ST0,
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};
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/* return registers for function */
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#define REG_IRET TREG_EAX /* single word int return register */
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#define REG_LRET TREG_EDX /* second word return register (for long long) */
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#define REG_FRET TREG_ST0 /* float return register */
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/* defined if function parameters must be evaluated in reverse order */
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#define INVERT_FUNC_PARAMS
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/* defined if structures are passed as pointers. Otherwise structures
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are directly pushed on stack. */
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//#define FUNC_STRUCT_PARAM_AS_PTR
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/* pointer size, in bytes */
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#define PTR_SIZE 4
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/* long double size and alignment, in bytes */
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#define LDOUBLE_SIZE 12
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#define LDOUBLE_ALIGN 4
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/* maximum alignment (for aligned attribute support) */
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#define MAX_ALIGN 8
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/******************************************************/
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/* ELF defines */
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#define EM_TCC_TARGET EM_386
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/* relocation type for 32 bit data relocation */
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#define R_DATA_32 R_386_32
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#define R_JMP_SLOT R_386_JMP_SLOT
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#define R_COPY R_386_COPY
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#define ELF_START_ADDR 0x08048000
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#define ELF_PAGE_SIZE 0x1000
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/******************************************************/
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static unsigned long func_sub_sp_offset;
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static unsigned long func_bound_offset;
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static int func_ret_sub;
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/* XXX: make it faster ? */
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void g(int c)
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{
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int ind1;
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ind1 = ind + 1;
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if (ind1 > cur_text_section->data_allocated)
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section_realloc(cur_text_section, ind1);
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cur_text_section->data[ind] = c;
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ind = ind1;
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}
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void o(unsigned int c)
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{
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while (c) {
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g(c);
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c = c >> 8;
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}
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}
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void gen_le32(int c)
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{
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g(c);
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g(c >> 8);
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g(c >> 16);
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g(c >> 24);
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}
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/* output a symbol and patch all calls to it */
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void gsym_addr(int t, int a)
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{
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int n, *ptr;
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while (t) {
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ptr = (int *)(cur_text_section->data + t);
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n = *ptr; /* next value */
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*ptr = a - t - 4;
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t = n;
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}
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}
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void gsym(int t)
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{
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gsym_addr(t, ind);
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}
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/* psym is used to put an instruction with a data field which is a
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reference to a symbol. It is in fact the same as oad ! */
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#define psym oad
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/* instruction + 4 bytes data. Return the address of the data */
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static int oad(int c, int s)
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{
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int ind1;
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o(c);
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ind1 = ind + 4;
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if (ind1 > cur_text_section->data_allocated)
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section_realloc(cur_text_section, ind1);
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*(int *)(cur_text_section->data + ind) = s;
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s = ind;
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ind = ind1;
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return s;
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}
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/* output constant with relocation if 'r & VT_SYM' is true */
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static void gen_addr32(int r, Sym *sym, int c)
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{
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if (r & VT_SYM)
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greloc(cur_text_section, sym, ind, R_386_32);
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gen_le32(c);
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}
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/* generate a modrm reference. 'op_reg' contains the addtionnal 3
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opcode bits */
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static void gen_modrm(int op_reg, int r, Sym *sym, int c)
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{
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op_reg = op_reg << 3;
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if ((r & VT_VALMASK) == VT_CONST) {
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/* constant memory reference */
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o(0x05 | op_reg);
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gen_addr32(r, sym, c);
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} else if ((r & VT_VALMASK) == VT_LOCAL) {
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/* currently, we use only ebp as base */
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if (c == (char)c) {
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/* short reference */
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o(0x45 | op_reg);
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g(c);
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} else {
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oad(0x85 | op_reg, c);
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}
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} else {
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g(0x00 | op_reg | (r & VT_VALMASK));
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}
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}
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/* load 'r' from value 'sv' */
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void load(int r, SValue *sv)
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{
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int v, t, ft, fc, fr;
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SValue v1;
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fr = sv->r;
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ft = sv->type.t;
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fc = sv->c.ul;
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v = fr & VT_VALMASK;
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if (fr & VT_LVAL) {
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if (v == VT_LLOCAL) {
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v1.type.t = VT_INT;
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v1.r = VT_LOCAL | VT_LVAL;
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v1.c.ul = fc;
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load(r, &v1);
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fr = r;
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}
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if ((ft & VT_BTYPE) == VT_FLOAT) {
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o(0xd9); /* flds */
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r = 0;
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} else if ((ft & VT_BTYPE) == VT_DOUBLE) {
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o(0xdd); /* fldl */
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r = 0;
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} else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
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o(0xdb); /* fldt */
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r = 5;
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} else if ((ft & VT_TYPE) == VT_BYTE) {
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o(0xbe0f); /* movsbl */
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} else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED)) {
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o(0xb60f); /* movzbl */
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} else if ((ft & VT_TYPE) == VT_SHORT) {
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o(0xbf0f); /* movswl */
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} else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED)) {
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o(0xb70f); /* movzwl */
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} else {
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o(0x8b); /* movl */
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}
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gen_modrm(r, fr, sv->sym, fc);
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} else {
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if (v == VT_CONST) {
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o(0xb8 + r); /* mov $xx, r */
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gen_addr32(fr, sv->sym, fc);
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} else if (v == VT_LOCAL) {
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o(0x8d); /* lea xxx(%ebp), r */
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gen_modrm(r, VT_LOCAL, sv->sym, fc);
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} else if (v == VT_CMP) {
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oad(0xb8 + r, 0); /* mov $0, r */
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o(0x0f); /* setxx %br */
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o(fc);
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o(0xc0 + r);
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} else if (v == VT_JMP || v == VT_JMPI) {
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t = v & 1;
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oad(0xb8 + r, t); /* mov $1, r */
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o(0x05eb); /* jmp after */
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gsym(fc);
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oad(0xb8 + r, t ^ 1); /* mov $0, r */
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} else if (v != r) {
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o(0x89);
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o(0xc0 + r + v * 8); /* mov v, r */
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}
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}
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}
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/* store register 'r' in lvalue 'v' */
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void store(int r, SValue *v)
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{
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int fr, bt, ft, fc;
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ft = v->type.t;
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fc = v->c.ul;
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fr = v->r & VT_VALMASK;
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bt = ft & VT_BTYPE;
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/* XXX: incorrect if float reg to reg */
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if (bt == VT_FLOAT) {
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o(0xd9); /* fsts */
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r = 2;
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} else if (bt == VT_DOUBLE) {
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o(0xdd); /* fstpl */
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r = 2;
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} else if (bt == VT_LDOUBLE) {
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o(0xc0d9); /* fld %st(0) */
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o(0xdb); /* fstpt */
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r = 7;
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} else {
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if (bt == VT_SHORT)
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o(0x66);
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if (bt == VT_BYTE || bt == VT_BOOL)
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o(0x88);
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else
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o(0x89);
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}
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if (fr == VT_CONST ||
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fr == VT_LOCAL ||
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(v->r & VT_LVAL)) {
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gen_modrm(r, v->r, v->sym, fc);
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} else if (fr != r) {
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o(0xc0 + fr + r * 8); /* mov r, fr */
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}
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}
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static void gadd_sp(int val)
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{
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if (val == (char)val) {
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o(0xc483);
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g(val);
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} else {
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oad(0xc481, val); /* add $xxx, %esp */
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}
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}
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/* 'is_jmp' is '1' if it is a jump */
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static void gcall_or_jmp(int is_jmp)
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{
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int r;
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if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
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/* constant case */
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if (vtop->r & VT_SYM) {
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/* relocation case */
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greloc(cur_text_section, vtop->sym,
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ind + 1, R_386_PC32);
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} else {
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/* put an empty PC32 relocation */
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put_elf_reloc(symtab_section, cur_text_section,
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ind + 1, R_386_PC32, 0);
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}
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oad(0xe8 + is_jmp, vtop->c.ul - 4); /* call/jmp im */
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} else {
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/* otherwise, indirect call */
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r = gv(RC_INT);
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o(0xff); /* call/jmp *r */
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o(0xd0 + r + (is_jmp << 4));
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}
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}
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static uint8_t fastcall_regs[3] = { TREG_EAX, TREG_EDX, TREG_ECX };
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static uint8_t fastcallw_regs[2] = { TREG_ECX, TREG_EDX };
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/* Generate function call. The function address is pushed first, then
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all the parameters in call order. This functions pops all the
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parameters and the function address. */
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void gfunc_call(int nb_args)
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{
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int size, align, r, args_size, i, func_call;
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Sym *func_sym;
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args_size = 0;
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for(i = 0;i < nb_args; i++) {
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if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
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size = type_size(&vtop->type, &align);
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/* align to stack align size */
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size = (size + 3) & ~3;
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/* allocate the necessary size on stack */
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oad(0xec81, size); /* sub $xxx, %esp */
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/* generate structure store */
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r = get_reg(RC_INT);
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o(0x89); /* mov %esp, r */
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o(0xe0 + r);
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vset(&vtop->type, r | VT_LVAL, 0);
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vswap();
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vstore();
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args_size += size;
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} else if (is_float(vtop->type.t)) {
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gv(RC_FLOAT); /* only one float register */
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if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
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size = 4;
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else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
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size = 8;
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else
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size = 12;
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oad(0xec81, size); /* sub $xxx, %esp */
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if (size == 12)
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o(0x7cdb);
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else
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o(0x5cd9 + size - 4); /* fstp[s|l] 0(%esp) */
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g(0x24);
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g(0x00);
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args_size += size;
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} else {
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/* simple type (currently always same size) */
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/* XXX: implicit cast ? */
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r = gv(RC_INT);
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if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
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size = 8;
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o(0x50 + vtop->r2); /* push r */
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} else {
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size = 4;
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}
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o(0x50 + r); /* push r */
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args_size += size;
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}
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vtop--;
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}
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save_regs(0); /* save used temporary registers */
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func_sym = vtop->type.ref;
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func_call = FUNC_CALL(func_sym->r);
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/* fast call case */
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if ((func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) ||
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func_call == FUNC_FASTCALLW) {
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int fastcall_nb_regs;
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uint8_t *fastcall_regs_ptr;
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if (func_call == FUNC_FASTCALLW) {
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fastcall_regs_ptr = fastcallw_regs;
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fastcall_nb_regs = 2;
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} else {
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fastcall_regs_ptr = fastcall_regs;
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fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
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}
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for(i = 0;i < fastcall_nb_regs; i++) {
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if (args_size <= 0)
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break;
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o(0x58 + fastcall_regs_ptr[i]); /* pop r */
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/* XXX: incorrect for struct/floats */
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args_size -= 4;
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}
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}
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gcall_or_jmp(0);
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if (args_size && func_call != FUNC_STDCALL)
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gadd_sp(args_size);
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vtop--;
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}
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#ifdef TCC_TARGET_PE
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#define FUNC_PROLOG_SIZE 10
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#else
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#define FUNC_PROLOG_SIZE 9
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#endif
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/* generate function prolog of type 't' */
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void gfunc_prolog(CType *func_type)
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{
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int addr, align, size, func_call, fastcall_nb_regs;
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int param_index, param_addr;
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uint8_t *fastcall_regs_ptr;
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Sym *sym;
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CType *type;
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sym = func_type->ref;
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func_call = FUNC_CALL(sym->r);
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addr = 8;
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loc = 0;
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if (func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) {
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fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
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fastcall_regs_ptr = fastcall_regs;
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} else if (func_call == FUNC_FASTCALLW) {
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fastcall_nb_regs = 2;
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fastcall_regs_ptr = fastcallw_regs;
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} else {
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fastcall_nb_regs = 0;
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fastcall_regs_ptr = NULL;
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}
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param_index = 0;
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|
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ind += FUNC_PROLOG_SIZE;
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func_sub_sp_offset = ind;
|
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/* if the function returns a structure, then add an
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implicit pointer parameter */
|
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func_vt = sym->type;
|
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if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
|
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/* XXX: fastcall case ? */
|
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func_vc = addr;
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addr += 4;
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param_index++;
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}
|
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/* define parameters */
|
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while ((sym = sym->next) != NULL) {
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type = &sym->type;
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size = type_size(type, &align);
|
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size = (size + 3) & ~3;
|
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#ifdef FUNC_STRUCT_PARAM_AS_PTR
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/* structs are passed as pointer */
|
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if ((type->t & VT_BTYPE) == VT_STRUCT) {
|
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size = 4;
|
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}
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#endif
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if (param_index < fastcall_nb_regs) {
|
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/* save FASTCALL register */
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loc -= 4;
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o(0x89); /* movl */
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gen_modrm(fastcall_regs_ptr[param_index], VT_LOCAL, NULL, loc);
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param_addr = loc;
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} else {
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param_addr = addr;
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addr += size;
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}
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sym_push(sym->v & ~SYM_FIELD, type,
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VT_LOCAL | lvalue_type(type->t), param_addr);
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param_index++;
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}
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func_ret_sub = 0;
|
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/* pascal type call ? */
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if (func_call == FUNC_STDCALL)
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func_ret_sub = addr - 8;
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|
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/* leave some room for bound checking code */
|
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if (do_bounds_check) {
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oad(0xb8, 0); /* lbound section pointer */
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oad(0xb8, 0); /* call to function */
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func_bound_offset = lbounds_section->data_offset;
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}
|
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}
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|
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/* generate function epilog */
|
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void gfunc_epilog(void)
|
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{
|
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int v, saved_ind;
|
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|
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#ifdef CONFIG_TCC_BCHECK
|
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if (do_bounds_check && func_bound_offset != lbounds_section->data_offset) {
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int saved_ind;
|
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int *bounds_ptr;
|
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Sym *sym, *sym_data;
|
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/* add end of table info */
|
|
bounds_ptr = section_ptr_add(lbounds_section, sizeof(int));
|
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*bounds_ptr = 0;
|
|
/* generate bound local allocation */
|
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saved_ind = ind;
|
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ind = func_sub_sp_offset;
|
|
sym_data = get_sym_ref(&char_pointer_type, lbounds_section,
|
|
func_bound_offset, lbounds_section->data_offset);
|
|
greloc(cur_text_section, sym_data,
|
|
ind + 1, R_386_32);
|
|
oad(0xb8, 0); /* mov %eax, xxx */
|
|
sym = external_global_sym(TOK___bound_local_new, &func_old_type, 0);
|
|
greloc(cur_text_section, sym,
|
|
ind + 1, R_386_PC32);
|
|
oad(0xe8, -4);
|
|
ind = saved_ind;
|
|
/* generate bound check local freeing */
|
|
o(0x5250); /* save returned value, if any */
|
|
greloc(cur_text_section, sym_data,
|
|
ind + 1, R_386_32);
|
|
oad(0xb8, 0); /* mov %eax, xxx */
|
|
sym = external_global_sym(TOK___bound_local_delete, &func_old_type, 0);
|
|
greloc(cur_text_section, sym,
|
|
ind + 1, R_386_PC32);
|
|
oad(0xe8, -4);
|
|
o(0x585a); /* restore returned value, if any */
|
|
}
|
|
#endif
|
|
o(0xc9); /* leave */
|
|
if (func_ret_sub == 0) {
|
|
o(0xc3); /* ret */
|
|
} else {
|
|
o(0xc2); /* ret n */
|
|
g(func_ret_sub);
|
|
g(func_ret_sub >> 8);
|
|
}
|
|
/* align local size to word & save local variables */
|
|
|
|
v = (-loc + 3) & -4;
|
|
saved_ind = ind;
|
|
ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
|
|
#ifdef TCC_TARGET_PE
|
|
if (v >= 4096) {
|
|
Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
|
|
oad(0xb8, v); /* mov stacksize, %eax */
|
|
oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
|
|
greloc(cur_text_section, sym, ind-4, R_386_PC32);
|
|
} else
|
|
#endif
|
|
{
|
|
o(0xe58955); /* push %ebp, mov %esp, %ebp */
|
|
o(0xec81); /* sub esp, stacksize */
|
|
gen_le32(v);
|
|
#if FUNC_PROLOG_SIZE == 10
|
|
o(0x90); /* adjust to FUNC_PROLOG_SIZE */
|
|
#endif
|
|
}
|
|
ind = saved_ind;
|
|
}
|
|
|
|
/* generate a jump to a label */
|
|
int gjmp(int t)
|
|
{
|
|
return psym(0xe9, t);
|
|
}
|
|
|
|
/* generate a jump to a fixed address */
|
|
void gjmp_addr(int a)
|
|
{
|
|
int r;
|
|
r = a - ind - 2;
|
|
if (r == (char)r) {
|
|
g(0xeb);
|
|
g(r);
|
|
} else {
|
|
oad(0xe9, a - ind - 5);
|
|
}
|
|
}
|
|
|
|
/* generate a test. set 'inv' to invert test. Stack entry is popped */
|
|
int gtst(int inv, int t)
|
|
{
|
|
int v, *p;
|
|
|
|
v = vtop->r & VT_VALMASK;
|
|
if (v == VT_CMP) {
|
|
/* fast case : can jump directly since flags are set */
|
|
g(0x0f);
|
|
t = psym((vtop->c.i - 16) ^ inv, t);
|
|
} else if (v == VT_JMP || v == VT_JMPI) {
|
|
/* && or || optimization */
|
|
if ((v & 1) == inv) {
|
|
/* insert vtop->c jump list in t */
|
|
p = &vtop->c.i;
|
|
while (*p != 0)
|
|
p = (int *)(cur_text_section->data + *p);
|
|
*p = t;
|
|
t = vtop->c.i;
|
|
} else {
|
|
t = gjmp(t);
|
|
gsym(vtop->c.i);
|
|
}
|
|
} else {
|
|
if (is_float(vtop->type.t) ||
|
|
(vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
|
vpushi(0);
|
|
gen_op(TOK_NE);
|
|
}
|
|
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
|
/* constant jmp optimization */
|
|
if ((vtop->c.i != 0) != inv)
|
|
t = gjmp(t);
|
|
} else {
|
|
v = gv(RC_INT);
|
|
o(0x85);
|
|
o(0xc0 + v * 9);
|
|
g(0x0f);
|
|
t = psym(0x85 ^ inv, t);
|
|
}
|
|
}
|
|
vtop--;
|
|
return t;
|
|
}
|
|
|
|
/* generate an integer binary operation */
|
|
void gen_opi(int op)
|
|
{
|
|
int r, fr, opc, c;
|
|
|
|
switch(op) {
|
|
case '+':
|
|
case TOK_ADDC1: /* add with carry generation */
|
|
opc = 0;
|
|
gen_op8:
|
|
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
|
/* constant case */
|
|
vswap();
|
|
r = gv(RC_INT);
|
|
vswap();
|
|
c = vtop->c.i;
|
|
if (c == (char)c) {
|
|
/* XXX: generate inc and dec for smaller code ? */
|
|
o(0x83);
|
|
o(0xc0 | (opc << 3) | r);
|
|
g(c);
|
|
} else {
|
|
o(0x81);
|
|
oad(0xc0 | (opc << 3) | r, c);
|
|
}
|
|
} else {
|
|
gv2(RC_INT, RC_INT);
|
|
r = vtop[-1].r;
|
|
fr = vtop[0].r;
|
|
o((opc << 3) | 0x01);
|
|
o(0xc0 + r + fr * 8);
|
|
}
|
|
vtop--;
|
|
if (op >= TOK_ULT && op <= TOK_GT) {
|
|
vtop->r = VT_CMP;
|
|
vtop->c.i = op;
|
|
}
|
|
break;
|
|
case '-':
|
|
case TOK_SUBC1: /* sub with carry generation */
|
|
opc = 5;
|
|
goto gen_op8;
|
|
case TOK_ADDC2: /* add with carry use */
|
|
opc = 2;
|
|
goto gen_op8;
|
|
case TOK_SUBC2: /* sub with carry use */
|
|
opc = 3;
|
|
goto gen_op8;
|
|
case '&':
|
|
opc = 4;
|
|
goto gen_op8;
|
|
case '^':
|
|
opc = 6;
|
|
goto gen_op8;
|
|
case '|':
|
|
opc = 1;
|
|
goto gen_op8;
|
|
case '*':
|
|
gv2(RC_INT, RC_INT);
|
|
r = vtop[-1].r;
|
|
fr = vtop[0].r;
|
|
vtop--;
|
|
o(0xaf0f); /* imul fr, r */
|
|
o(0xc0 + fr + r * 8);
|
|
break;
|
|
case TOK_SHL:
|
|
opc = 4;
|
|
goto gen_shift;
|
|
case TOK_SHR:
|
|
opc = 5;
|
|
goto gen_shift;
|
|
case TOK_SAR:
|
|
opc = 7;
|
|
gen_shift:
|
|
opc = 0xc0 | (opc << 3);
|
|
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
|
/* constant case */
|
|
vswap();
|
|
r = gv(RC_INT);
|
|
vswap();
|
|
c = vtop->c.i & 0x1f;
|
|
o(0xc1); /* shl/shr/sar $xxx, r */
|
|
o(opc | r);
|
|
g(c);
|
|
} else {
|
|
/* we generate the shift in ecx */
|
|
gv2(RC_INT, RC_ECX);
|
|
r = vtop[-1].r;
|
|
o(0xd3); /* shl/shr/sar %cl, r */
|
|
o(opc | r);
|
|
}
|
|
vtop--;
|
|
break;
|
|
case '/':
|
|
case TOK_UDIV:
|
|
case TOK_PDIV:
|
|
case '%':
|
|
case TOK_UMOD:
|
|
case TOK_UMULL:
|
|
/* first operand must be in eax */
|
|
/* XXX: need better constraint for second operand */
|
|
gv2(RC_EAX, RC_ECX);
|
|
r = vtop[-1].r;
|
|
fr = vtop[0].r;
|
|
vtop--;
|
|
save_reg(TREG_EDX);
|
|
if (op == TOK_UMULL) {
|
|
o(0xf7); /* mul fr */
|
|
o(0xe0 + fr);
|
|
vtop->r2 = TREG_EDX;
|
|
r = TREG_EAX;
|
|
} else {
|
|
if (op == TOK_UDIV || op == TOK_UMOD) {
|
|
o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
|
|
o(0xf0 + fr);
|
|
} else {
|
|
o(0xf799); /* cltd, idiv fr, %eax */
|
|
o(0xf8 + fr);
|
|
}
|
|
if (op == '%' || op == TOK_UMOD)
|
|
r = TREG_EDX;
|
|
else
|
|
r = TREG_EAX;
|
|
}
|
|
vtop->r = r;
|
|
break;
|
|
default:
|
|
opc = 7;
|
|
goto gen_op8;
|
|
}
|
|
}
|
|
|
|
/* generate a floating point operation 'v = t1 op t2' instruction. The
|
|
two operands are guaranted to have the same floating point type */
|
|
/* XXX: need to use ST1 too */
|
|
void gen_opf(int op)
|
|
{
|
|
int a, ft, fc, swapped, r;
|
|
|
|
/* convert constants to memory references */
|
|
if ((vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
|
|
vswap();
|
|
gv(RC_FLOAT);
|
|
vswap();
|
|
}
|
|
if ((vtop[0].r & (VT_VALMASK | VT_LVAL)) == VT_CONST)
|
|
gv(RC_FLOAT);
|
|
|
|
/* must put at least one value in the floating point register */
|
|
if ((vtop[-1].r & VT_LVAL) &&
|
|
(vtop[0].r & VT_LVAL)) {
|
|
vswap();
|
|
gv(RC_FLOAT);
|
|
vswap();
|
|
}
|
|
swapped = 0;
|
|
/* swap the stack if needed so that t1 is the register and t2 is
|
|
the memory reference */
|
|
if (vtop[-1].r & VT_LVAL) {
|
|
vswap();
|
|
swapped = 1;
|
|
}
|
|
if (op >= TOK_ULT && op <= TOK_GT) {
|
|
/* load on stack second operand */
|
|
load(TREG_ST0, vtop);
|
|
save_reg(TREG_EAX); /* eax is used by FP comparison code */
|
|
if (op == TOK_GE || op == TOK_GT)
|
|
swapped = !swapped;
|
|
else if (op == TOK_EQ || op == TOK_NE)
|
|
swapped = 0;
|
|
if (swapped)
|
|
o(0xc9d9); /* fxch %st(1) */
|
|
o(0xe9da); /* fucompp */
|
|
o(0xe0df); /* fnstsw %ax */
|
|
if (op == TOK_EQ) {
|
|
o(0x45e480); /* and $0x45, %ah */
|
|
o(0x40fC80); /* cmp $0x40, %ah */
|
|
} else if (op == TOK_NE) {
|
|
o(0x45e480); /* and $0x45, %ah */
|
|
o(0x40f480); /* xor $0x40, %ah */
|
|
op = TOK_NE;
|
|
} else if (op == TOK_GE || op == TOK_LE) {
|
|
o(0x05c4f6); /* test $0x05, %ah */
|
|
op = TOK_EQ;
|
|
} else {
|
|
o(0x45c4f6); /* test $0x45, %ah */
|
|
op = TOK_EQ;
|
|
}
|
|
vtop--;
|
|
vtop->r = VT_CMP;
|
|
vtop->c.i = op;
|
|
} else {
|
|
/* no memory reference possible for long double operations */
|
|
if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
|
|
load(TREG_ST0, vtop);
|
|
swapped = !swapped;
|
|
}
|
|
|
|
switch(op) {
|
|
default:
|
|
case '+':
|
|
a = 0;
|
|
break;
|
|
case '-':
|
|
a = 4;
|
|
if (swapped)
|
|
a++;
|
|
break;
|
|
case '*':
|
|
a = 1;
|
|
break;
|
|
case '/':
|
|
a = 6;
|
|
if (swapped)
|
|
a++;
|
|
break;
|
|
}
|
|
ft = vtop->type.t;
|
|
fc = vtop->c.ul;
|
|
if ((ft & VT_BTYPE) == VT_LDOUBLE) {
|
|
o(0xde); /* fxxxp %st, %st(1) */
|
|
o(0xc1 + (a << 3));
|
|
} else {
|
|
/* if saved lvalue, then we must reload it */
|
|
r = vtop->r;
|
|
if ((r & VT_VALMASK) == VT_LLOCAL) {
|
|
SValue v1;
|
|
r = get_reg(RC_INT);
|
|
v1.type.t = VT_INT;
|
|
v1.r = VT_LOCAL | VT_LVAL;
|
|
v1.c.ul = fc;
|
|
load(r, &v1);
|
|
fc = 0;
|
|
}
|
|
|
|
if ((ft & VT_BTYPE) == VT_DOUBLE)
|
|
o(0xdc);
|
|
else
|
|
o(0xd8);
|
|
gen_modrm(a, r, vtop->sym, fc);
|
|
}
|
|
vtop--;
|
|
}
|
|
}
|
|
|
|
/* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
|
|
and 'long long' cases. */
|
|
void gen_cvt_itof(int t)
|
|
{
|
|
save_reg(TREG_ST0);
|
|
gv(RC_INT);
|
|
if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
|
/* signed long long to float/double/long double (unsigned case
|
|
is handled generically) */
|
|
o(0x50 + vtop->r2); /* push r2 */
|
|
o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
|
o(0x242cdf); /* fildll (%esp) */
|
|
o(0x08c483); /* add $8, %esp */
|
|
} else if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
|
|
(VT_INT | VT_UNSIGNED)) {
|
|
/* unsigned int to float/double/long double */
|
|
o(0x6a); /* push $0 */
|
|
g(0x00);
|
|
o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
|
o(0x242cdf); /* fildll (%esp) */
|
|
o(0x08c483); /* add $8, %esp */
|
|
} else {
|
|
/* int to float/double/long double */
|
|
o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
|
o(0x2404db); /* fildl (%esp) */
|
|
o(0x04c483); /* add $4, %esp */
|
|
}
|
|
vtop->r = TREG_ST0;
|
|
}
|
|
|
|
/* convert fp to int 't' type */
|
|
/* XXX: handle long long case */
|
|
void gen_cvt_ftoi(int t)
|
|
{
|
|
int r, r2, size;
|
|
Sym *sym;
|
|
CType ushort_type;
|
|
|
|
ushort_type.t = VT_SHORT | VT_UNSIGNED;
|
|
|
|
gv(RC_FLOAT);
|
|
if (t != VT_INT)
|
|
size = 8;
|
|
else
|
|
size = 4;
|
|
|
|
o(0x2dd9); /* ldcw xxx */
|
|
sym = external_global_sym(TOK___tcc_int_fpu_control,
|
|
&ushort_type, VT_LVAL);
|
|
greloc(cur_text_section, sym,
|
|
ind, R_386_32);
|
|
gen_le32(0);
|
|
|
|
oad(0xec81, size); /* sub $xxx, %esp */
|
|
if (size == 4)
|
|
o(0x1cdb); /* fistpl */
|
|
else
|
|
o(0x3cdf); /* fistpll */
|
|
o(0x24);
|
|
o(0x2dd9); /* ldcw xxx */
|
|
sym = external_global_sym(TOK___tcc_fpu_control,
|
|
&ushort_type, VT_LVAL);
|
|
greloc(cur_text_section, sym,
|
|
ind, R_386_32);
|
|
gen_le32(0);
|
|
|
|
r = get_reg(RC_INT);
|
|
o(0x58 + r); /* pop r */
|
|
if (size == 8) {
|
|
if (t == VT_LLONG) {
|
|
vtop->r = r; /* mark reg as used */
|
|
r2 = get_reg(RC_INT);
|
|
o(0x58 + r2); /* pop r2 */
|
|
vtop->r2 = r2;
|
|
} else {
|
|
o(0x04c483); /* add $4, %esp */
|
|
}
|
|
}
|
|
vtop->r = r;
|
|
}
|
|
|
|
/* convert from one floating point type to another */
|
|
void gen_cvt_ftof(int t)
|
|
{
|
|
/* all we have to do on i386 is to put the float in a register */
|
|
gv(RC_FLOAT);
|
|
}
|
|
|
|
/* computed goto support */
|
|
void ggoto(void)
|
|
{
|
|
gcall_or_jmp(1);
|
|
vtop--;
|
|
}
|
|
|
|
/* bound check support functions */
|
|
#ifdef CONFIG_TCC_BCHECK
|
|
|
|
/* generate a bounded pointer addition */
|
|
void gen_bounded_ptr_add(void)
|
|
{
|
|
Sym *sym;
|
|
|
|
/* prepare fast i386 function call (args in eax and edx) */
|
|
gv2(RC_EAX, RC_EDX);
|
|
/* save all temporary registers */
|
|
vtop -= 2;
|
|
save_regs(0);
|
|
/* do a fast function call */
|
|
sym = external_global_sym(TOK___bound_ptr_add, &func_old_type, 0);
|
|
greloc(cur_text_section, sym,
|
|
ind + 1, R_386_PC32);
|
|
oad(0xe8, -4);
|
|
/* returned pointer is in eax */
|
|
vtop++;
|
|
vtop->r = TREG_EAX | VT_BOUNDED;
|
|
/* address of bounding function call point */
|
|
vtop->c.ul = (cur_text_section->reloc->data_offset - sizeof(Elf32_Rel));
|
|
}
|
|
|
|
/* patch pointer addition in vtop so that pointer dereferencing is
|
|
also tested */
|
|
void gen_bounded_ptr_deref(void)
|
|
{
|
|
int func;
|
|
int size, align;
|
|
Elf32_Rel *rel;
|
|
Sym *sym;
|
|
|
|
size = 0;
|
|
/* XXX: put that code in generic part of tcc */
|
|
if (!is_float(vtop->type.t)) {
|
|
if (vtop->r & VT_LVAL_BYTE)
|
|
size = 1;
|
|
else if (vtop->r & VT_LVAL_SHORT)
|
|
size = 2;
|
|
}
|
|
if (!size)
|
|
size = type_size(&vtop->type, &align);
|
|
switch(size) {
|
|
case 1: func = TOK___bound_ptr_indir1; break;
|
|
case 2: func = TOK___bound_ptr_indir2; break;
|
|
case 4: func = TOK___bound_ptr_indir4; break;
|
|
case 8: func = TOK___bound_ptr_indir8; break;
|
|
case 12: func = TOK___bound_ptr_indir12; break;
|
|
case 16: func = TOK___bound_ptr_indir16; break;
|
|
default:
|
|
error("unhandled size when derefencing bounded pointer");
|
|
func = 0;
|
|
break;
|
|
}
|
|
|
|
/* patch relocation */
|
|
/* XXX: find a better solution ? */
|
|
rel = (Elf32_Rel *)(cur_text_section->reloc->data + vtop->c.ul);
|
|
sym = external_global_sym(func, &func_old_type, 0);
|
|
if (!sym->c)
|
|
put_extern_sym(sym, NULL, 0, 0);
|
|
rel->r_info = ELF32_R_INFO(sym->c, ELF32_R_TYPE(rel->r_info));
|
|
}
|
|
#endif
|
|
|
|
/* end of X86 code generator */
|
|
/*************************************************************/
|
|
|