2 * X86 code generator for TCC
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #ifdef TARGET_DEFS_ONLY
23 /* number of available registers */
29 /* a register can belong to several classes. The classes must be
30 sorted from more general to more precise (see gv2() code which does
31 assumptions on it). */
32 #define RC_INT 0x0001 /* generic integer register */
33 #define RC_FLOAT 0x0002 /* generic float register */
38 #define RC_IRET RC_EAX /* function return: integer register */
39 #define RC_LRET RC_EDX /* function return: second integer register */
40 #define RC_FRET RC_ST0 /* function return: float register */
42 /* pretty names for the registers */
51 /* return registers for function */
52 #define REG_IRET TREG_EAX /* single word int return register */
53 #define REG_LRET TREG_EDX /* second word return register (for long long) */
54 #define REG_FRET TREG_ST0 /* float return register */
56 /* defined if function parameters must be evaluated in reverse order */
57 #define INVERT_FUNC_PARAMS
59 /* defined if structures are passed as pointers. Otherwise structures
60 are directly pushed on stack. */
61 /* #define FUNC_STRUCT_PARAM_AS_PTR */
63 /* pointer size, in bytes */
66 /* long double size and alignment, in bytes */
67 #define LDOUBLE_SIZE 12
68 #define LDOUBLE_ALIGN 4
69 /* maximum alignment (for aligned attribute support) */
75 /******************************************************/
78 #define EM_TCC_TARGET EM_386
80 /* relocation type for 32 bit data relocation */
81 #define R_DATA_32 R_386_32
82 #define R_DATA_PTR R_386_32
83 #define R_JMP_SLOT R_386_JMP_SLOT
84 #define R_COPY R_386_COPY
86 #define ELF_START_ADDR 0x08048000
87 #define ELF_PAGE_SIZE 0x1000
89 /******************************************************/
90 #else /* ! TARGET_DEFS_ONLY */
91 /******************************************************/
94 ST_DATA
const int reg_classes
[NB_REGS
] = {
95 /* eax */ RC_INT
| RC_EAX
,
96 /* ecx */ RC_INT
| RC_ECX
,
97 /* edx */ RC_INT
| RC_EDX
,
98 /* st0 */ RC_FLOAT
| RC_ST0
,
101 static unsigned long func_sub_sp_offset
;
102 static int func_ret_sub
;
103 #ifdef CONFIG_TCC_BCHECK
104 static addr_t func_bound_offset
;
107 /* XXX: make it faster ? */
108 ST_FUNC
void g(int c
)
112 if (ind1
> cur_text_section
->data_allocated
)
113 section_realloc(cur_text_section
, ind1
);
114 cur_text_section
->data
[ind
] = c
;
118 ST_FUNC
void o(unsigned int c
)
126 ST_FUNC
void gen_le16(int v
)
132 ST_FUNC
void gen_le32(int c
)
140 /* output a symbol and patch all calls to it */
141 ST_FUNC
void gsym_addr(int t
, int a
)
145 ptr
= (int *)(cur_text_section
->data
+ t
);
146 n
= *ptr
; /* next value */
152 ST_FUNC
void gsym(int t
)
157 /* psym is used to put an instruction with a data field which is a
158 reference to a symbol. It is in fact the same as oad ! */
161 /* instruction + 4 bytes data. Return the address of the data */
162 ST_FUNC
int oad(int c
, int s
)
168 if (ind1
> cur_text_section
->data_allocated
)
169 section_realloc(cur_text_section
, ind1
);
170 *(int *)(cur_text_section
->data
+ ind
) = s
;
176 /* output constant with relocation if 'r & VT_SYM' is true */
177 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
180 greloc(cur_text_section
, sym
, ind
, R_386_32
);
184 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
187 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
191 /* generate a modrm reference. 'op_reg' contains the addtionnal 3
193 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
195 op_reg
= op_reg
<< 3;
196 if ((r
& VT_VALMASK
) == VT_CONST
) {
197 /* constant memory reference */
199 gen_addr32(r
, sym
, c
);
200 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
201 /* currently, we use only ebp as base */
203 /* short reference */
207 oad(0x85 | op_reg
, c
);
210 g(0x00 | op_reg
| (r
& VT_VALMASK
));
214 /* load 'r' from value 'sv' */
215 ST_FUNC
void load(int r
, SValue
*sv
)
217 int v
, t
, ft
, fc
, fr
;
222 sv
= pe_getimport(sv
, &v2
);
231 if (v
== VT_LLOCAL
) {
233 v1
.r
= VT_LOCAL
| VT_LVAL
;
236 if (!(reg_classes
[fr
] & RC_INT
))
237 fr
= get_reg(RC_INT
);
240 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
243 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
246 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
249 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
250 o(0xbe0f); /* movsbl */
251 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
252 o(0xb60f); /* movzbl */
253 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
254 o(0xbf0f); /* movswl */
255 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
256 o(0xb70f); /* movzwl */
260 gen_modrm(r
, fr
, sv
->sym
, fc
);
263 o(0xb8 + r
); /* mov $xx, r */
264 gen_addr32(fr
, sv
->sym
, fc
);
265 } else if (v
== VT_LOCAL
) {
267 o(0x8d); /* lea xxx(%ebp), r */
268 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
271 o(0xe8 + r
); /* mov %ebp, r */
273 } else if (v
== VT_CMP
) {
274 oad(0xb8 + r
, 0); /* mov $0, r */
275 o(0x0f); /* setxx %br */
278 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
280 oad(0xb8 + r
, t
); /* mov $1, r */
281 o(0x05eb); /* jmp after */
283 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
286 o(0xc0 + r
+ v
* 8); /* mov v, r */
291 /* store register 'r' in lvalue 'v' */
292 ST_FUNC
void store(int r
, SValue
*v
)
298 v
= pe_getimport(v
, &v2
);
303 fr
= v
->r
& VT_VALMASK
;
305 /* XXX: incorrect if float reg to reg */
306 if (bt
== VT_FLOAT
) {
309 } else if (bt
== VT_DOUBLE
) {
312 } else if (bt
== VT_LDOUBLE
) {
313 o(0xc0d9); /* fld %st(0) */
319 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
324 if (fr
== VT_CONST
||
327 gen_modrm(r
, v
->r
, v
->sym
, fc
);
328 } else if (fr
!= r
) {
329 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
333 static void gadd_sp(int val
)
335 if (val
== (char)val
) {
339 oad(0xc481, val
); /* add $xxx, %esp */
343 static void gen_static_call(int v
)
347 sym
= external_global_sym(v
, &func_old_type
, 0);
349 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
352 /* 'is_jmp' is '1' if it is a jump */
353 static void gcall_or_jmp(int is_jmp
)
356 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
358 if (vtop
->r
& VT_SYM
) {
359 /* relocation case */
360 greloc(cur_text_section
, vtop
->sym
,
361 ind
+ 1, R_386_PC32
);
363 /* put an empty PC32 relocation */
364 put_elf_reloc(symtab_section
, cur_text_section
,
365 ind
+ 1, R_386_PC32
, 0);
367 oad(0xe8 + is_jmp
, vtop
->c
.ul
- 4); /* call/jmp im */
369 /* otherwise, indirect call */
371 o(0xff); /* call/jmp *r */
372 o(0xd0 + r
+ (is_jmp
<< 4));
376 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
377 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
379 ST_FUNC
int regargs_nregs(RegArgs
*args
)
384 /* Return the number of registers needed to return the struct, or 0 if
385 returning via struct pointer. */
386 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
, RegArgs
*args
)
391 *ret_align
= 1; // Never have to re-align return values for x86
393 size
= type_size(vt
, &align
);
396 } else if (size
> 4) {
406 *ret_align
= 1; // Never have to re-align return values for x86
413 /* Generate function call. The function address is pushed first, then
414 all the parameters in call order. This functions pops all the
415 parameters and the function address. */
416 ST_FUNC
void gfunc_call(int nb_args
)
418 int size
, align
, r
, args_size
, i
, func_call
;
422 for(i
= 0;i
< nb_args
; i
++) {
423 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
424 size
= type_size(&vtop
->type
, &align
);
425 /* align to stack align size */
426 size
= (size
+ 3) & ~3;
427 /* allocate the necessary size on stack */
428 oad(0xec81, size
); /* sub $xxx, %esp */
429 /* generate structure store */
431 o(0x89); /* mov %esp, r */
433 vset(&vtop
->type
, r
| VT_LVAL
, 0);
437 } else if (is_float(vtop
->type
.t
)) {
438 gv(RC_FLOAT
); /* only one float register */
439 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
441 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
445 oad(0xec81, size
); /* sub $xxx, %esp */
449 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
454 /* simple type (currently always same size) */
455 /* XXX: implicit cast ? */
457 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
459 o(0x50 + vtop
->r2
); /* push r */
463 o(0x50 + r
); /* push r */
468 save_regs(0); /* save used temporary registers */
469 func_sym
= vtop
->type
.ref
;
470 func_call
= func_sym
->a
.func_call
;
472 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
473 func_call
== FUNC_FASTCALLW
) {
474 int fastcall_nb_regs
;
475 uint8_t *fastcall_regs_ptr
;
476 if (func_call
== FUNC_FASTCALLW
) {
477 fastcall_regs_ptr
= fastcallw_regs
;
478 fastcall_nb_regs
= 2;
480 fastcall_regs_ptr
= fastcall_regs
;
481 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
483 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
486 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
487 /* XXX: incorrect for struct/floats */
491 #ifndef TCC_TARGET_PE
492 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
497 if (args_size
&& func_call
!= FUNC_STDCALL
)
503 #define FUNC_PROLOG_SIZE 10
505 #define FUNC_PROLOG_SIZE 9
508 /* generate function prolog of type 't' */
509 ST_FUNC
void gfunc_prolog(CType
*func_type
)
511 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
512 int param_index
, param_addr
;
513 uint8_t *fastcall_regs_ptr
;
517 sym
= func_type
->ref
;
518 func_call
= sym
->a
.func_call
;
523 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
524 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
525 fastcall_regs_ptr
= fastcall_regs
;
526 } else if (func_call
== FUNC_FASTCALLW
) {
527 fastcall_nb_regs
= 2;
528 fastcall_regs_ptr
= fastcallw_regs
;
530 fastcall_nb_regs
= 0;
531 fastcall_regs_ptr
= NULL
;
535 ind
+= FUNC_PROLOG_SIZE
;
536 func_sub_sp_offset
= ind
;
537 /* if the function returns a structure, then add an
538 implicit pointer parameter */
540 func_var
= (sym
->c
== FUNC_ELLIPSIS
);
542 size
= type_size(&func_vt
,&align
);
543 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) && (size
> 8)) {
545 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
547 /* XXX: fastcall case ? */
552 /* define parameters */
553 while ((sym
= sym
->next
) != NULL
) {
555 size
= type_size(type
, &align
);
556 size
= (size
+ 3) & ~3;
557 #ifdef FUNC_STRUCT_PARAM_AS_PTR
558 /* structs are passed as pointer */
559 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
563 if (param_index
< fastcall_nb_regs
) {
564 /* save FASTCALL register */
567 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
573 sym_push(sym
->v
& ~SYM_FIELD
, type
,
574 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
578 /* pascal type call ? */
579 if (func_call
== FUNC_STDCALL
)
580 func_ret_sub
= addr
- 8;
581 #ifndef TCC_TARGET_PE
586 #ifdef CONFIG_TCC_BCHECK
587 /* leave some room for bound checking code */
588 if (tcc_state
->do_bounds_check
) {
589 oad(0xb8, 0); /* lbound section pointer */
590 oad(0xb8, 0); /* call to function */
591 func_bound_offset
= lbounds_section
->data_offset
;
596 /* generate function epilog */
597 ST_FUNC
void gfunc_epilog(void)
601 #ifdef CONFIG_TCC_BCHECK
602 if (tcc_state
->do_bounds_check
603 && func_bound_offset
!= lbounds_section
->data_offset
) {
607 /* add end of table info */
608 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
610 /* generate bound local allocation */
612 ind
= func_sub_sp_offset
;
613 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
614 func_bound_offset
, lbounds_section
->data_offset
);
615 greloc(cur_text_section
, sym_data
,
617 oad(0xb8, 0); /* mov %eax, xxx */
618 gen_static_call(TOK___bound_local_new
);
621 /* generate bound check local freeing */
622 o(0x5250); /* save returned value, if any */
623 greloc(cur_text_section
, sym_data
,
625 oad(0xb8, 0); /* mov %eax, xxx */
626 gen_static_call(TOK___bound_local_delete
);
628 o(0x585a); /* restore returned value, if any */
632 if (func_ret_sub
== 0) {
637 g(func_ret_sub
>> 8);
639 /* align local size to word & save local variables */
643 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
646 oad(0xb8, v
); /* mov stacksize, %eax */
647 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
651 o(0xe58955); /* push %ebp, mov %esp, %ebp */
652 o(0xec81); /* sub esp, stacksize */
654 #if FUNC_PROLOG_SIZE == 10
655 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
661 /* generate a jump to a label */
662 ST_FUNC
int gjmp(int t
)
664 return psym(0xe9, t
);
667 /* generate a jump to a fixed address */
668 ST_FUNC
void gjmp_addr(int a
)
676 oad(0xe9, a
- ind
- 5);
680 /* generate a test. set 'inv' to invert test. Stack entry is popped */
681 ST_FUNC
int gtst(int inv
, int t
)
685 v
= vtop
->r
& VT_VALMASK
;
687 /* fast case : can jump directly since flags are set */
689 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
690 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
691 /* && or || optimization */
692 if ((v
& 1) == inv
) {
693 /* insert vtop->c jump list in t */
696 p
= (int *)(cur_text_section
->data
+ *p
);
708 /* generate an integer binary operation */
709 ST_FUNC
void gen_opi(int op
)
715 case TOK_ADDC1
: /* add with carry generation */
718 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
725 /* generate inc and dec for smaller code */
726 if (c
==1 && opc
==0) {
728 } else if (c
==1 && opc
==5) {
732 o(0xc0 | (opc
<< 3) | r
);
737 oad(0xc0 | (opc
<< 3) | r
, c
);
743 o((opc
<< 3) | 0x01);
744 o(0xc0 + r
+ fr
* 8);
747 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
753 case TOK_SUBC1
: /* sub with carry generation */
756 case TOK_ADDC2
: /* add with carry use */
759 case TOK_SUBC2
: /* sub with carry use */
776 o(0xaf0f); /* imul fr, r */
777 o(0xc0 + fr
+ r
* 8);
788 opc
= 0xc0 | (opc
<< 3);
789 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
794 c
= vtop
->c
.i
& 0x1f;
795 o(0xc1); /* shl/shr/sar $xxx, r */
799 /* we generate the shift in ecx */
802 o(0xd3); /* shl/shr/sar %cl, r */
813 /* first operand must be in eax */
814 /* XXX: need better constraint for second operand */
820 if (op
== TOK_UMULL
) {
821 o(0xf7); /* mul fr */
826 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
827 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
830 o(0xf799); /* cltd, idiv fr, %eax */
833 if (op
== '%' || op
== TOK_UMOD
)
846 /* generate a floating point operation 'v = t1 op t2' instruction. The
847 two operands are guaranted to have the same floating point type */
848 /* XXX: need to use ST1 too */
849 ST_FUNC
void gen_opf(int op
)
851 int a
, ft
, fc
, swapped
, r
;
853 /* convert constants to memory references */
854 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
859 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
862 /* must put at least one value in the floating point register */
863 if ((vtop
[-1].r
& VT_LVAL
) &&
864 (vtop
[0].r
& VT_LVAL
)) {
870 /* swap the stack if needed so that t1 is the register and t2 is
871 the memory reference */
872 if (vtop
[-1].r
& VT_LVAL
) {
876 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
877 /* load on stack second operand */
878 load(TREG_ST0
, vtop
);
879 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
880 if (op
== TOK_GE
|| op
== TOK_GT
)
882 else if (op
== TOK_EQ
|| op
== TOK_NE
)
885 o(0xc9d9); /* fxch %st(1) */
886 if (op
== TOK_EQ
|| op
== TOK_NE
)
887 o(0xe9da); /* fucompp */
889 o(0xd9de); /* fcompp */
890 o(0xe0df); /* fnstsw %ax */
892 o(0x45e480); /* and $0x45, %ah */
893 o(0x40fC80); /* cmp $0x40, %ah */
894 } else if (op
== TOK_NE
) {
895 o(0x45e480); /* and $0x45, %ah */
896 o(0x40f480); /* xor $0x40, %ah */
898 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
899 o(0x05c4f6); /* test $0x05, %ah */
902 o(0x45c4f6); /* test $0x45, %ah */
909 /* no memory reference possible for long double operations */
910 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
911 load(TREG_ST0
, vtop
);
936 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
937 o(0xde); /* fxxxp %st, %st(1) */
940 /* if saved lvalue, then we must reload it */
942 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
946 v1
.r
= VT_LOCAL
| VT_LVAL
;
952 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
956 gen_modrm(a
, r
, vtop
->sym
, fc
);
962 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
963 and 'long long' cases. */
964 ST_FUNC
void gen_cvt_itof(int t
)
968 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
969 /* signed long long to float/double/long double (unsigned case
970 is handled generically) */
971 o(0x50 + vtop
->r2
); /* push r2 */
972 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
973 o(0x242cdf); /* fildll (%esp) */
974 o(0x08c483); /* add $8, %esp */
975 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
976 (VT_INT
| VT_UNSIGNED
)) {
977 /* unsigned int to float/double/long double */
978 o(0x6a); /* push $0 */
980 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
981 o(0x242cdf); /* fildll (%esp) */
982 o(0x08c483); /* add $8, %esp */
984 /* int to float/double/long double */
985 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
986 o(0x2404db); /* fildl (%esp) */
987 o(0x04c483); /* add $4, %esp */
992 /* convert fp to int 't' type */
993 ST_FUNC
void gen_cvt_ftoi(int t
)
995 #ifndef COMMIT_4ad186c5ef61_IS_FIXED
996 /* a good version but it takes a more time to execute */
1000 gen_static_call(TOK___tcc_cvt_ftol
);
1001 vtop
->r
= TREG_EAX
; /* mark reg as used */
1003 vtop
->r2
= TREG_EDX
;
1005 /* a new version with a bug: t2a = 44100312 */
1011 int t2a = (int)(t1 * f); // must be 44100313
1012 int t2b = (int)(t1 * (float)0.25f);
1013 printf("t2a=%d t2b=%d \n",t2a,t2b);
1017 int bt
= vtop
->type
.t
& VT_BTYPE
;
1019 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1020 else if (bt
== VT_LDOUBLE
)
1021 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1023 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1028 vtop
->r2
= REG_LRET
;
1032 /* convert from one floating point type to another */
1033 ST_FUNC
void gen_cvt_ftof(int t
)
1035 /* all we have to do on i386 is to put the float in a register */
1039 /* computed goto support */
1040 ST_FUNC
void ggoto(void)
1046 /* bound check support functions */
1047 #ifdef CONFIG_TCC_BCHECK
1049 /* generate a bounded pointer addition */
1050 ST_FUNC
void gen_bounded_ptr_add(void)
1052 /* prepare fast i386 function call (args in eax and edx) */
1053 gv2(RC_EAX
, RC_EDX
);
1054 /* save all temporary registers */
1057 /* do a fast function call */
1058 gen_static_call(TOK___bound_ptr_add
);
1059 /* returned pointer is in eax */
1061 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1062 /* address of bounding function call point */
1063 vtop
->c
.ul
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1066 /* patch pointer addition in vtop so that pointer dereferencing is
1068 ST_FUNC
void gen_bounded_ptr_deref(void)
1076 /* XXX: put that code in generic part of tcc */
1077 if (!is_float(vtop
->type
.t
)) {
1078 if (vtop
->r
& VT_LVAL_BYTE
)
1080 else if (vtop
->r
& VT_LVAL_SHORT
)
1084 size
= type_size(&vtop
->type
, &align
);
1086 case 1: func
= TOK___bound_ptr_indir1
; break;
1087 case 2: func
= TOK___bound_ptr_indir2
; break;
1088 case 4: func
= TOK___bound_ptr_indir4
; break;
1089 case 8: func
= TOK___bound_ptr_indir8
; break;
1090 case 12: func
= TOK___bound_ptr_indir12
; break;
1091 case 16: func
= TOK___bound_ptr_indir16
; break;
1093 tcc_error("unhandled size when dereferencing bounded pointer");
1098 /* patch relocation */
1099 /* XXX: find a better solution ? */
1100 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.ul
);
1101 sym
= external_global_sym(func
, &func_old_type
, 0);
1103 put_extern_sym(sym
, NULL
, 0, 0);
1104 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1108 /* Save the stack pointer onto the stack */
1109 ST_FUNC
void gen_vla_sp_save(int addr
) {
1110 /* mov %esp,addr(%ebp)*/
1112 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1115 /* Restore the SP from a location on the stack */
1116 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1118 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1121 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1122 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1123 #ifdef TCC_TARGET_PE
1124 /* alloca does more than just adjust %rsp on Windows */
1125 vpush_global_sym(&func_old_type
, TOK_alloca
);
1126 vswap(); /* Move alloca ref past allocation size */
1128 vset(type
, REG_IRET
, 0);
1131 r
= gv(RC_INT
); /* allocation size */
1135 /* We align to 16 bytes rather than align */
1146 /* end of X86 code generator */
1147 /*************************************************************/
1149 /*************************************************************/