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 */
26 #define CONFIG_TCC_ASM
28 /* a register can belong to several classes. The classes must be
29 sorted from more general to more precise (see gv2() code which does
30 assumptions on it). */
31 #define RC_INT 0x0001 /* generic integer register */
32 #define RC_FLOAT 0x0002 /* generic float register */
39 #define RC_IRET RC_EAX /* function return: integer register */
40 #define RC_LRET RC_EDX /* function return: second integer register */
41 #define RC_FRET RC_ST0 /* function return: float register */
43 /* pretty names for the registers */
53 /* return registers for function */
54 #define REG_IRET TREG_EAX /* single word int return register */
55 #define REG_LRET TREG_EDX /* second word return register (for long long) */
56 #define REG_FRET TREG_ST0 /* float return register */
58 /* defined if function parameters must be evaluated in reverse order */
59 #define INVERT_FUNC_PARAMS
61 /* defined if structures are passed as pointers. Otherwise structures
62 are directly pushed on stack. */
63 /* #define FUNC_STRUCT_PARAM_AS_PTR */
65 /* pointer size, in bytes */
68 /* long double size and alignment, in bytes */
69 #define LDOUBLE_SIZE 12
70 #define LDOUBLE_ALIGN 4
71 /* maximum alignment (for aligned attribute support) */
74 /******************************************************/
75 #else /* ! TARGET_DEFS_ONLY */
76 /******************************************************/
80 /* define to 1/0 to [not] have EBX as 4th register */
83 ST_DATA
const int reg_classes
[NB_REGS
] = {
84 /* eax */ RC_INT
| RC_EAX
,
85 /* ecx */ RC_INT
| RC_ECX
,
86 /* edx */ RC_INT
| RC_EDX
,
87 /* ebx */ (RC_INT
| RC_EBX
) * USE_EBX
,
88 /* st0 */ RC_FLOAT
| RC_ST0
,
91 static unsigned long func_sub_sp_offset
;
92 static int func_ret_sub
;
93 #ifdef CONFIG_TCC_BCHECK
94 static addr_t func_bound_offset
;
95 static unsigned long func_bound_ind
;
98 /* XXX: make it faster ? */
105 if (ind1
> cur_text_section
->data_allocated
)
106 section_realloc(cur_text_section
, ind1
);
107 cur_text_section
->data
[ind
] = c
;
111 ST_FUNC
void o(unsigned int c
)
119 ST_FUNC
void gen_le16(int v
)
125 ST_FUNC
void gen_le32(int c
)
133 /* output a symbol and patch all calls to it */
134 ST_FUNC
void gsym_addr(int t
, int a
)
137 unsigned char *ptr
= cur_text_section
->data
+ t
;
138 uint32_t n
= read32le(ptr
); /* next value */
139 write32le(ptr
, a
- t
- 4);
144 /* instruction + 4 bytes data. Return the address of the data */
145 static int oad(int c
, int s
)
156 ST_FUNC
void gen_fill_nops(int bytes
)
162 /* generate jmp to a label */
163 #define gjmp2(instr,lbl) oad(instr,lbl)
165 /* output constant with relocation if 'r & VT_SYM' is true */
166 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
169 greloc(cur_text_section
, sym
, ind
, R_386_32
);
173 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
176 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
180 /* generate a modrm reference. 'op_reg' contains the additional 3
182 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
184 op_reg
= op_reg
<< 3;
185 if ((r
& VT_VALMASK
) == VT_CONST
) {
186 /* constant memory reference */
188 gen_addr32(r
, sym
, c
);
189 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
190 /* currently, we use only ebp as base */
192 /* short reference */
196 oad(0x85 | op_reg
, c
);
199 g(0x00 | op_reg
| (r
& VT_VALMASK
));
203 /* load 'r' from value 'sv' */
204 ST_FUNC
void load(int r
, SValue
*sv
)
206 int v
, t
, ft
, fc
, fr
;
211 sv
= pe_getimport(sv
, &v2
);
215 ft
= sv
->type
.t
& ~VT_DEFSIGN
;
218 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
222 if (v
== VT_LLOCAL
) {
224 v1
.r
= VT_LOCAL
| VT_LVAL
;
227 if (!(reg_classes
[fr
] & RC_INT
))
228 fr
= get_reg(RC_INT
);
231 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
234 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
237 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
240 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
241 o(0xbe0f); /* movsbl */
242 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
243 o(0xb60f); /* movzbl */
244 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
245 o(0xbf0f); /* movswl */
246 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
247 o(0xb70f); /* movzwl */
251 gen_modrm(r
, fr
, sv
->sym
, fc
);
254 o(0xb8 + r
); /* mov $xx, r */
255 gen_addr32(fr
, sv
->sym
, fc
);
256 } else if (v
== VT_LOCAL
) {
258 o(0x8d); /* lea xxx(%ebp), r */
259 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
262 o(0xe8 + r
); /* mov %ebp, r */
264 } else if (v
== VT_CMP
) {
265 o(0x0f); /* setxx %br */
268 o(0xc0b60f + r
* 0x90000); /* movzbl %al, %eax */
269 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
271 oad(0xb8 + r
, t
); /* mov $1, r */
272 o(0x05eb); /* jmp after */
274 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
277 o(0xc0 + r
+ v
* 8); /* mov v, r */
282 /* store register 'r' in lvalue 'v' */
283 ST_FUNC
void store(int r
, SValue
*v
)
289 v
= pe_getimport(v
, &v2
);
294 fr
= v
->r
& VT_VALMASK
;
295 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
297 /* XXX: incorrect if float reg to reg */
298 if (bt
== VT_FLOAT
) {
301 } else if (bt
== VT_DOUBLE
) {
304 } else if (bt
== VT_LDOUBLE
) {
305 o(0xc0d9); /* fld %st(0) */
311 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
316 if (fr
== VT_CONST
||
319 gen_modrm(r
, v
->r
, v
->sym
, fc
);
320 } else if (fr
!= r
) {
321 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
325 static void gadd_sp(int val
)
327 if (val
== (char)val
) {
331 oad(0xc481, val
); /* add $xxx, %esp */
335 #if defined CONFIG_TCC_BCHECK || defined TCC_TARGET_PE
336 static void gen_static_call(int v
)
340 sym
= external_global_sym(v
, &func_old_type
);
342 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
346 /* 'is_jmp' is '1' if it is a jump */
347 static void gcall_or_jmp(int is_jmp
)
350 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&& (vtop
->r
& VT_SYM
)) {
351 /* constant and relocation case */
352 greloc(cur_text_section
, vtop
->sym
, ind
+ 1, R_386_PC32
);
353 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
355 /* otherwise, indirect call */
357 o(0xff); /* call/jmp *r */
358 o(0xd0 + r
+ (is_jmp
<< 4));
362 /* extend the return value to the whole register if necessary
363 visual studio and gcc do not always set the whole eax register
364 when assigning the return value of a function */
365 rt
= vtop
->type
.ref
->type
.t
;
366 switch (rt
& VT_BTYPE
) {
369 if (rt
& VT_UNSIGNED
) {
370 o(0xc0b60f); /* movzx %al, %eax */
373 o(0xc0be0f); /* movsx %al, %eax */
377 if (rt
& VT_UNSIGNED
) {
378 o(0xc0b70f); /* movzx %ax, %eax */
381 o(0xc0bf0f); /* movsx %ax, %eax */
390 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
391 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
393 /* Return the number of registers needed to return the struct, or 0 if
394 returning via struct pointer. */
395 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
399 *ret_align
= 1; // Never have to re-align return values for x86
401 size
= type_size(vt
, &align
);
402 if (size
> 8 || (size
& (size
- 1)))
415 *ret_align
= 1; // Never have to re-align return values for x86
420 /* Generate function call. The function address is pushed first, then
421 all the parameters in call order. This functions pops all the
422 parameters and the function address. */
423 ST_FUNC
void gfunc_call(int nb_args
)
425 int size
, align
, r
, args_size
, i
, func_call
;
428 #ifdef CONFIG_TCC_BCHECK
429 if (tcc_state
->do_bounds_check
)
430 gbound_args(nb_args
);
434 for(i
= 0;i
< nb_args
; i
++) {
435 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
436 size
= type_size(&vtop
->type
, &align
);
437 /* align to stack align size */
438 size
= (size
+ 3) & ~3;
439 /* allocate the necessary size on stack */
440 oad(0xec81, size
); /* sub $xxx, %esp */
441 /* generate structure store */
443 o(0x89); /* mov %esp, r */
445 vset(&vtop
->type
, r
| VT_LVAL
, 0);
449 } else if (is_float(vtop
->type
.t
)) {
450 gv(RC_FLOAT
); /* only one float register */
451 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
453 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
457 oad(0xec81, size
); /* sub $xxx, %esp */
461 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
466 /* simple type (currently always same size) */
467 /* XXX: implicit cast ? */
469 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
471 o(0x50 + vtop
->r2
); /* push r */
475 o(0x50 + r
); /* push r */
480 save_regs(0); /* save used temporary registers */
481 func_sym
= vtop
->type
.ref
;
482 func_call
= func_sym
->f
.func_call
;
484 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
485 func_call
== FUNC_FASTCALLW
) {
486 int fastcall_nb_regs
;
487 uint8_t *fastcall_regs_ptr
;
488 if (func_call
== FUNC_FASTCALLW
) {
489 fastcall_regs_ptr
= fastcallw_regs
;
490 fastcall_nb_regs
= 2;
492 fastcall_regs_ptr
= fastcall_regs
;
493 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
495 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
498 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
499 /* XXX: incorrect for struct/floats */
503 #ifndef TCC_TARGET_PE
504 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
509 if (args_size
&& func_call
!= FUNC_STDCALL
&& func_call
!= FUNC_FASTCALLW
)
515 #define FUNC_PROLOG_SIZE (10 + USE_EBX)
517 #define FUNC_PROLOG_SIZE (9 + USE_EBX)
520 /* generate function prolog of type 't' */
521 ST_FUNC
void gfunc_prolog(Sym
*func_sym
)
523 CType
*func_type
= &func_sym
->type
;
524 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
525 int param_index
, param_addr
;
527 uint8_t *fastcall_regs_ptr
;
531 sym
= func_type
->ref
;
532 func_call
= sym
->f
.func_call
;
537 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
538 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
539 fastcall_regs_ptr
= fastcall_regs
;
540 } else if (func_call
== FUNC_FASTCALLW
) {
541 fastcall_nb_regs
= 2;
542 fastcall_regs_ptr
= fastcallw_regs
;
544 fastcall_nb_regs
= 0;
545 fastcall_regs_ptr
= NULL
;
549 ind
+= FUNC_PROLOG_SIZE
;
550 func_sub_sp_offset
= ind
;
551 /* if the function returns a structure, then add an
552 implicit pointer parameter */
554 func_var
= (sym
->f
.func_type
== FUNC_ELLIPSIS
);
556 size
= type_size(&func_vt
,&align
);
557 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
)
558 && (size
> 8 || (size
& (size
- 1)))) {
560 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
562 /* XXX: fastcall case ? */
567 /* define parameters */
568 while ((sym
= sym
->next
) != NULL
) {
571 size
= type_size(type
, &align
);
572 size
= (size
+ 3) & ~3;
573 #ifdef FUNC_STRUCT_PARAM_AS_PTR
574 /* structs are passed as pointer */
575 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
579 if (param_index
< fastcall_nb_regs
) {
580 /* save FASTCALL register */
583 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
589 sym_push(sym
->v
& ~SYM_FIELD
, type
,
590 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
594 /* pascal type call or fastcall ? */
595 if (func_call
== FUNC_STDCALL
|| func_call
== FUNC_FASTCALLW
)
596 func_ret_sub
= addr
- 8;
597 #ifndef TCC_TARGET_PE
602 #ifdef CONFIG_TCC_BCHECK
603 /* leave some room for bound checking code */
604 if (tcc_state
->do_bounds_check
) {
605 func_bound_offset
= lbounds_section
->data_offset
;
606 func_bound_ind
= ind
;
607 oad(0xb8, 0); /* lbound section pointer */
608 oad(0xb8, 0); /* call to function */
609 if (n_arg
>= 2 && strcmp (get_tok_str(func_sym
->v
, NULL
), "main") == 0) {
610 o(0x0c458b); /* mov 0x12(%ebp),%eax */
611 o(0x50); /* push %eax */
612 gen_static_call(TOK___bound_main_arg
);
613 o(0x04c483); /* add $0x4,%esp */
619 /* generate function epilog */
620 ST_FUNC
void gfunc_epilog(void)
624 #ifdef CONFIG_TCC_BCHECK
625 if (tcc_state
->do_bounds_check
626 && func_bound_offset
!= lbounds_section
->data_offset
) {
631 /* add end of table info */
632 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
635 /* generate bound local allocation */
637 ind
= func_bound_ind
;
638 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
639 func_bound_offset
, lbounds_section
->data_offset
);
640 greloc(cur_text_section
, sym_data
,
642 oad(0xb8, 0); /* mov %eax, xxx */
643 gen_static_call(TOK___bound_local_new
);
646 /* generate bound check local freeing */
647 o(0x5250); /* save returned value, if any */
648 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
649 oad(0xb8, 0); /* mov %eax, xxx */
650 gen_static_call(TOK___bound_local_delete
);
651 o(0x585a); /* restore returned value, if any */
655 /* align local size to word & save local variables */
660 gen_modrm(TREG_EBX
, VT_LOCAL
, NULL
, -(v
+4));
664 if (func_ret_sub
== 0) {
669 g(func_ret_sub
>> 8);
672 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
675 oad(0xb8, v
); /* mov stacksize, %eax */
676 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
680 o(0xe58955); /* push %ebp, mov %esp, %ebp */
681 o(0xec81); /* sub esp, stacksize */
684 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
687 o(0x53 * USE_EBX
); /* push ebx */
691 /* generate a jump to a label */
692 ST_FUNC
int gjmp(int t
)
694 return gjmp2(0xe9, t
);
697 /* generate a jump to a fixed address */
698 ST_FUNC
void gjmp_addr(int a
)
706 oad(0xe9, a
- ind
- 5);
711 /* generate a jump to a fixed address */
712 ST_FUNC
void gjmp_cond_addr(int a
, int op
)
718 g(0x0f), gjmp2(op
- 16, r
- 4);
722 ST_FUNC
int gjmp_append(int n
, int t
)
725 /* insert vtop->c jump list in t */
728 while ((n2
= read32le(p
= cur_text_section
->data
+ n1
)))
736 ST_FUNC
int gjmp_cond(int op
, int t
)
739 t
= gjmp2(op
- 16, t
);
743 ST_FUNC
void gen_opi(int op
)
749 case TOK_ADDC1
: /* add with carry generation */
752 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
759 /* generate inc and dec for smaller code */
760 if ((c
== 1 || c
== -1) && (op
== '+' || op
== '-')) {
761 opc
= (c
== 1) ^ (op
== '+');
762 o (0x40 | (opc
<< 3) | r
); // inc,dec
765 o(0xc0 | (opc
<< 3) | r
);
770 oad(0xc0 | (opc
<< 3) | r
, c
);
776 o((opc
<< 3) | 0x01);
777 o(0xc0 + r
+ fr
* 8);
780 if (op
>= TOK_ULT
&& op
<= TOK_GT
)
784 case TOK_SUBC1
: /* sub with carry generation */
787 case TOK_ADDC2
: /* add with carry use */
790 case TOK_SUBC2
: /* sub with carry use */
807 o(0xaf0f); /* imul fr, r */
808 o(0xc0 + fr
+ r
* 8);
819 opc
= 0xc0 | (opc
<< 3);
820 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
825 c
= vtop
->c
.i
& 0x1f;
826 o(0xc1); /* shl/shr/sar $xxx, r */
830 /* we generate the shift in ecx */
833 o(0xd3); /* shl/shr/sar %cl, r */
844 /* first operand must be in eax */
845 /* XXX: need better constraint for second operand */
851 /* save EAX too if used otherwise */
852 save_reg_upstack(TREG_EAX
, 1);
853 if (op
== TOK_UMULL
) {
854 o(0xf7); /* mul fr */
859 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
860 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
863 o(0xf799); /* cltd, idiv fr, %eax */
866 if (op
== '%' || op
== TOK_UMOD
)
879 /* generate a floating point operation 'v = t1 op t2' instruction. The
880 two operands are guaranteed to have the same floating point type */
881 /* XXX: need to use ST1 too */
882 ST_FUNC
void gen_opf(int op
)
884 int a
, ft
, fc
, swapped
, r
;
886 /* convert constants to memory references */
887 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
892 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
895 /* must put at least one value in the floating point register */
896 if ((vtop
[-1].r
& VT_LVAL
) &&
897 (vtop
[0].r
& VT_LVAL
)) {
903 /* swap the stack if needed so that t1 is the register and t2 is
904 the memory reference */
905 if (vtop
[-1].r
& VT_LVAL
) {
909 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
910 /* load on stack second operand */
911 load(TREG_ST0
, vtop
);
912 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
913 if (op
== TOK_GE
|| op
== TOK_GT
)
915 else if (op
== TOK_EQ
|| op
== TOK_NE
)
918 o(0xc9d9); /* fxch %st(1) */
919 if (op
== TOK_EQ
|| op
== TOK_NE
)
920 o(0xe9da); /* fucompp */
922 o(0xd9de); /* fcompp */
923 o(0xe0df); /* fnstsw %ax */
925 o(0x45e480); /* and $0x45, %ah */
926 o(0x40fC80); /* cmp $0x40, %ah */
927 } else if (op
== TOK_NE
) {
928 o(0x45e480); /* and $0x45, %ah */
929 o(0x40f480); /* xor $0x40, %ah */
931 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
932 o(0x05c4f6); /* test $0x05, %ah */
935 o(0x45c4f6); /* test $0x45, %ah */
941 /* no memory reference possible for long double operations */
942 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
943 load(TREG_ST0
, vtop
);
968 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
969 o(0xde); /* fxxxp %st, %st(1) */
972 /* if saved lvalue, then we must reload it */
974 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
978 v1
.r
= VT_LOCAL
| VT_LVAL
;
984 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
988 gen_modrm(a
, r
, vtop
->sym
, fc
);
994 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
995 and 'long long' cases. */
996 ST_FUNC
void gen_cvt_itof(int t
)
1000 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
1001 /* signed long long to float/double/long double (unsigned case
1002 is handled generically) */
1003 o(0x50 + vtop
->r2
); /* push r2 */
1004 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1005 o(0x242cdf); /* fildll (%esp) */
1006 o(0x08c483); /* add $8, %esp */
1007 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1008 (VT_INT
| VT_UNSIGNED
)) {
1009 /* unsigned int to float/double/long double */
1010 o(0x6a); /* push $0 */
1012 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1013 o(0x242cdf); /* fildll (%esp) */
1014 o(0x08c483); /* add $8, %esp */
1016 /* int to float/double/long double */
1017 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1018 o(0x2404db); /* fildl (%esp) */
1019 o(0x04c483); /* add $4, %esp */
1021 vtop
->r2
= VT_CONST
;
1025 /* convert fp to int 't' type */
1026 ST_FUNC
void gen_cvt_ftoi(int t
)
1028 int bt
= vtop
->type
.t
& VT_BTYPE
;
1030 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1031 else if (bt
== VT_LDOUBLE
)
1032 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1034 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1039 if ((t
& VT_BTYPE
) == VT_LLONG
)
1040 vtop
->r2
= REG_LRET
;
1043 /* convert from one floating point type to another */
1044 ST_FUNC
void gen_cvt_ftof(int t
)
1046 /* all we have to do on i386 is to put the float in a register */
1050 /* computed goto support */
1051 ST_FUNC
void ggoto(void)
1057 /* bound check support functions */
1058 #ifdef CONFIG_TCC_BCHECK
1059 /* generate a bounded pointer addition */
1060 ST_FUNC
void gen_bounded_ptr_add(void)
1062 vpush_global_sym(&func_old_type
, TOK___bound_ptr_add
);
1066 /* returned pointer is in eax */
1067 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1070 /* relocation offset of the bounding function call point */
1071 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1074 /* patch pointer addition in vtop so that pointer dereferencing is
1076 ST_FUNC
void gen_bounded_ptr_deref(void)
1087 /* XXX: put that code in generic part of tcc */
1088 if (!is_float(vtop
->type
.t
)) {
1089 if (vtop
->r
& VT_LVAL_BYTE
)
1091 else if (vtop
->r
& VT_LVAL_SHORT
)
1095 size
= type_size(&vtop
->type
, &align
);
1097 case 1: func
= TOK___bound_ptr_indir1
; break;
1098 case 2: func
= TOK___bound_ptr_indir2
; break;
1099 case 4: func
= TOK___bound_ptr_indir4
; break;
1100 case 8: func
= TOK___bound_ptr_indir8
; break;
1101 case 12: func
= TOK___bound_ptr_indir12
; break;
1102 case 16: func
= TOK___bound_ptr_indir16
; break;
1104 /* may happen with struct member access */
1106 //tcc_error("unhandled size when dereferencing bounded pointer");
1110 sym
= external_global_sym(func
, &func_old_type
);
1112 put_extern_sym(sym
, NULL
, 0, 0);
1113 /* patch relocation */
1114 /* XXX: find a better solution ? */
1115 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1116 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1120 /* Save the stack pointer onto the stack */
1121 ST_FUNC
void gen_vla_sp_save(int addr
) {
1122 /* mov %esp,addr(%ebp)*/
1124 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1127 /* Restore the SP from a location on the stack */
1128 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1130 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1133 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1134 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1137 #if defined(CONFIG_TCC_BCHECK)
1138 use_call
= tcc_state
->do_bounds_check
;
1140 #ifdef TCC_TARGET_PE /* alloca does more than just adjust %rsp on Windows */
1145 vpush_global_sym(&func_old_type
, TOK_alloca
);
1146 vswap(); /* Move alloca ref past allocation size */
1151 r
= gv(RC_INT
); /* allocation size */
1155 /* We align to 16 bytes rather than align */
1162 /* end of X86 code generator */
1163 /*************************************************************/
1165 /*************************************************************/