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 /******************************************************/
79 /* define to 1/0 to [not] have EBX as 4th register */
82 ST_DATA
const int reg_classes
[NB_REGS
] = {
83 /* eax */ RC_INT
| RC_EAX
,
84 /* ecx */ RC_INT
| RC_ECX
,
85 /* edx */ RC_INT
| RC_EDX
,
86 /* ebx */ (RC_INT
| RC_EBX
) * USE_EBX
,
87 /* st0 */ RC_FLOAT
| RC_ST0
,
90 static unsigned long func_sub_sp_offset
;
91 static int func_ret_sub
;
92 #ifdef CONFIG_TCC_BCHECK
93 static addr_t func_bound_offset
;
94 static unsigned long func_bound_ind
;
97 /* XXX: make it faster ? */
104 if (ind1
> cur_text_section
->data_allocated
)
105 section_realloc(cur_text_section
, ind1
);
106 cur_text_section
->data
[ind
] = c
;
110 ST_FUNC
void o(unsigned int c
)
118 ST_FUNC
void gen_le16(int v
)
124 ST_FUNC
void gen_le32(int c
)
132 /* output a symbol and patch all calls to it */
133 ST_FUNC
void gsym_addr(int t
, int a
)
136 unsigned char *ptr
= cur_text_section
->data
+ t
;
137 uint32_t n
= read32le(ptr
); /* next value */
138 write32le(ptr
, a
- t
- 4);
143 ST_FUNC
void gsym(int t
)
148 /* instruction + 4 bytes data. Return the address of the data */
149 static int oad(int c
, int s
)
160 /* generate jmp to a label */
161 #define gjmp2(instr,lbl) oad(instr,lbl)
163 /* output constant with relocation if 'r & VT_SYM' is true */
164 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
167 greloc(cur_text_section
, sym
, ind
, R_386_32
);
171 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
174 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
178 /* generate a modrm reference. 'op_reg' contains the additional 3
180 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
182 op_reg
= op_reg
<< 3;
183 if ((r
& VT_VALMASK
) == VT_CONST
) {
184 /* constant memory reference */
186 gen_addr32(r
, sym
, c
);
187 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
188 /* currently, we use only ebp as base */
190 /* short reference */
194 oad(0x85 | op_reg
, c
);
197 g(0x00 | op_reg
| (r
& VT_VALMASK
));
201 /* load 'r' from value 'sv' */
202 ST_FUNC
void load(int r
, SValue
*sv
)
204 int v
, t
, ft
, fc
, fr
;
209 sv
= pe_getimport(sv
, &v2
);
213 ft
= sv
->type
.t
& ~VT_DEFSIGN
;
216 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
220 if (v
== VT_LLOCAL
) {
222 v1
.r
= VT_LOCAL
| VT_LVAL
;
225 if (!(reg_classes
[fr
] & RC_INT
))
226 fr
= get_reg(RC_INT
);
229 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
232 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
235 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
238 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
239 o(0xbe0f); /* movsbl */
240 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
241 o(0xb60f); /* movzbl */
242 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
243 o(0xbf0f); /* movswl */
244 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
245 o(0xb70f); /* movzwl */
249 gen_modrm(r
, fr
, sv
->sym
, fc
);
252 o(0xb8 + r
); /* mov $xx, r */
253 gen_addr32(fr
, sv
->sym
, fc
);
254 } else if (v
== VT_LOCAL
) {
256 o(0x8d); /* lea xxx(%ebp), r */
257 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
260 o(0xe8 + r
); /* mov %ebp, r */
262 } else if (v
== VT_CMP
) {
263 oad(0xb8 + r
, 0); /* mov $0, r */
264 o(0x0f); /* setxx %br */
267 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
269 oad(0xb8 + r
, t
); /* mov $1, r */
270 o(0x05eb); /* jmp after */
272 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
275 o(0xc0 + r
+ v
* 8); /* mov v, r */
280 /* store register 'r' in lvalue 'v' */
281 ST_FUNC
void store(int r
, SValue
*v
)
287 v
= pe_getimport(v
, &v2
);
292 fr
= v
->r
& VT_VALMASK
;
293 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
295 /* XXX: incorrect if float reg to reg */
296 if (bt
== VT_FLOAT
) {
299 } else if (bt
== VT_DOUBLE
) {
302 } else if (bt
== VT_LDOUBLE
) {
303 o(0xc0d9); /* fld %st(0) */
309 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
314 if (fr
== VT_CONST
||
317 gen_modrm(r
, v
->r
, v
->sym
, fc
);
318 } else if (fr
!= r
) {
319 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
323 static void gadd_sp(int val
)
325 if (val
== (char)val
) {
329 oad(0xc481, val
); /* add $xxx, %esp */
333 #if defined CONFIG_TCC_BCHECK || defined TCC_TARGET_PE
334 static void gen_static_call(int v
)
338 sym
= external_global_sym(v
, &func_old_type
, 0);
340 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
344 /* 'is_jmp' is '1' if it is a jump */
345 static void gcall_or_jmp(int is_jmp
)
348 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&& (vtop
->r
& VT_SYM
)) {
349 /* constant and relocation case */
350 greloc(cur_text_section
, vtop
->sym
, ind
+ 1, R_386_PC32
);
351 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
353 /* otherwise, indirect call */
355 o(0xff); /* call/jmp *r */
356 o(0xd0 + r
+ (is_jmp
<< 4));
360 /* extend the return value to the whole register if necessary
361 visual studio and gcc do not always set the whole eax register
362 when assigning the return value of a function */
363 rt
= vtop
->type
.ref
->type
.t
;
364 switch (rt
& VT_BTYPE
) {
366 if (rt
& VT_UNSIGNED
) {
367 o(0xc0b60f); /* movzx %al, %eax */
370 o(0xc0be0f); /* movsx %al, %eax */
374 if (rt
& VT_UNSIGNED
) {
375 o(0xc0b70f); /* movzx %ax, %eax */
378 o(0xc0bf0f); /* movsx %ax, %eax */
387 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
388 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
390 /* Return the number of registers needed to return the struct, or 0 if
391 returning via struct pointer. */
392 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
396 *ret_align
= 1; // Never have to re-align return values for x86
398 size
= type_size(vt
, &align
);
399 if (size
> 8 || (size
& (size
- 1)))
412 *ret_align
= 1; // Never have to re-align return values for x86
417 /* Generate function call. The function address is pushed first, then
418 all the parameters in call order. This functions pops all the
419 parameters and the function address. */
420 ST_FUNC
void gfunc_call(int nb_args
)
422 int size
, align
, r
, args_size
, i
, func_call
;
426 for(i
= 0;i
< nb_args
; i
++) {
427 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
428 size
= type_size(&vtop
->type
, &align
);
429 /* align to stack align size */
430 size
= (size
+ 3) & ~3;
431 /* allocate the necessary size on stack */
432 oad(0xec81, size
); /* sub $xxx, %esp */
433 /* generate structure store */
435 o(0x89); /* mov %esp, r */
437 vset(&vtop
->type
, r
| VT_LVAL
, 0);
441 } else if (is_float(vtop
->type
.t
)) {
442 gv(RC_FLOAT
); /* only one float register */
443 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
445 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
449 oad(0xec81, size
); /* sub $xxx, %esp */
453 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
458 /* simple type (currently always same size) */
459 /* XXX: implicit cast ? */
461 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
463 o(0x50 + vtop
->r2
); /* push r */
467 o(0x50 + r
); /* push r */
472 save_regs(0); /* save used temporary registers */
473 func_sym
= vtop
->type
.ref
;
474 func_call
= func_sym
->f
.func_call
;
476 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
477 func_call
== FUNC_FASTCALLW
) {
478 int fastcall_nb_regs
;
479 uint8_t *fastcall_regs_ptr
;
480 if (func_call
== FUNC_FASTCALLW
) {
481 fastcall_regs_ptr
= fastcallw_regs
;
482 fastcall_nb_regs
= 2;
484 fastcall_regs_ptr
= fastcall_regs
;
485 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
487 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
490 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
491 /* XXX: incorrect for struct/floats */
495 #ifndef TCC_TARGET_PE
496 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
501 if (args_size
&& func_call
!= FUNC_STDCALL
&& func_call
!= FUNC_FASTCALLW
)
507 #define FUNC_PROLOG_SIZE (10 + USE_EBX)
509 #define FUNC_PROLOG_SIZE (9 + USE_EBX)
512 /* generate function prolog of type 't' */
513 ST_FUNC
void gfunc_prolog(CType
*func_type
)
515 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
516 int param_index
, param_addr
;
517 uint8_t *fastcall_regs_ptr
;
521 sym
= func_type
->ref
;
522 func_call
= sym
->f
.func_call
;
527 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
528 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
529 fastcall_regs_ptr
= fastcall_regs
;
530 } else if (func_call
== FUNC_FASTCALLW
) {
531 fastcall_nb_regs
= 2;
532 fastcall_regs_ptr
= fastcallw_regs
;
534 fastcall_nb_regs
= 0;
535 fastcall_regs_ptr
= NULL
;
539 ind
+= FUNC_PROLOG_SIZE
;
540 func_sub_sp_offset
= ind
;
541 /* if the function returns a structure, then add an
542 implicit pointer parameter */
544 func_var
= (sym
->f
.func_type
== FUNC_ELLIPSIS
);
546 size
= type_size(&func_vt
,&align
);
547 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
)
548 && (size
> 8 || (size
& (size
- 1)))) {
550 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
552 /* XXX: fastcall case ? */
557 /* define parameters */
558 while ((sym
= sym
->next
) != NULL
) {
560 size
= type_size(type
, &align
);
561 size
= (size
+ 3) & ~3;
562 #ifdef FUNC_STRUCT_PARAM_AS_PTR
563 /* structs are passed as pointer */
564 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
568 if (param_index
< fastcall_nb_regs
) {
569 /* save FASTCALL register */
572 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
578 sym_push(sym
->v
& ~SYM_FIELD
, type
,
579 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
583 /* pascal type call or fastcall ? */
584 if (func_call
== FUNC_STDCALL
|| func_call
== FUNC_FASTCALLW
)
585 func_ret_sub
= addr
- 8;
586 #ifndef TCC_TARGET_PE
591 #ifdef CONFIG_TCC_BCHECK
592 /* leave some room for bound checking code */
593 if (tcc_state
->do_bounds_check
) {
594 func_bound_offset
= lbounds_section
->data_offset
;
595 func_bound_ind
= ind
;
596 oad(0xb8, 0); /* lbound section pointer */
597 oad(0xb8, 0); /* call to function */
602 /* generate function epilog */
603 ST_FUNC
void gfunc_epilog(void)
607 #ifdef CONFIG_TCC_BCHECK
608 if (tcc_state
->do_bounds_check
609 && func_bound_offset
!= lbounds_section
->data_offset
) {
614 /* add end of table info */
615 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
618 /* generate bound local allocation */
620 ind
= func_bound_ind
;
621 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
622 func_bound_offset
, lbounds_section
->data_offset
);
623 greloc(cur_text_section
, sym_data
,
625 oad(0xb8, 0); /* mov %eax, xxx */
626 gen_static_call(TOK___bound_local_new
);
629 /* generate bound check local freeing */
630 o(0x5250); /* save returned value, if any */
631 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
632 oad(0xb8, 0); /* mov %eax, xxx */
633 gen_static_call(TOK___bound_local_delete
);
634 o(0x585a); /* restore returned value, if any */
638 /* align local size to word & save local variables */
643 gen_modrm(TREG_EBX
, VT_LOCAL
, NULL
, -(v
+4));
647 if (func_ret_sub
== 0) {
652 g(func_ret_sub
>> 8);
655 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
658 oad(0xb8, v
); /* mov stacksize, %eax */
659 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
663 o(0xe58955); /* push %ebp, mov %esp, %ebp */
664 o(0xec81); /* sub esp, stacksize */
667 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
670 o(0x53 * USE_EBX
); /* push ebx */
674 /* generate a jump to a label */
675 ST_FUNC
int gjmp(int t
)
677 return gjmp2(0xe9, t
);
680 /* generate a jump to a fixed address */
681 ST_FUNC
void gjmp_addr(int a
)
689 oad(0xe9, a
- ind
- 5);
693 ST_FUNC
void gtst_addr(int inv
, int a
)
695 int v
= vtop
->r
& VT_VALMASK
;
697 inv
^= (vtop
--)->c
.i
;
704 oad(inv
- 16, a
- 4);
706 } else if ((v
& ~1) == VT_JMP
) {
707 if ((v
& 1) != inv
) {
719 /* generate a test. set 'inv' to invert test. Stack entry is popped */
720 ST_FUNC
int gtst(int inv
, int t
)
722 int v
= vtop
->r
& VT_VALMASK
;
725 } else if (v
== VT_CMP
) {
726 /* fast case : can jump directly since flags are set */
728 t
= gjmp2((vtop
->c
.i
- 16) ^ inv
, t
);
729 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
730 /* && or || optimization */
731 if ((v
& 1) == inv
) {
732 /* insert vtop->c jump list in t */
733 uint32_t n1
, n
= vtop
->c
.i
;
735 while ((n1
= read32le(cur_text_section
->data
+ n
)))
737 write32le(cur_text_section
->data
+ n
, t
);
749 /* generate an integer binary operation */
750 ST_FUNC
void gen_opi(int op
)
756 case TOK_ADDC1
: /* add with carry generation */
759 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
766 /* generate inc and dec for smaller code */
767 if (c
==1 && opc
==0 && op
!= TOK_ADDC1
) {
769 } else if (c
==1 && opc
==5 && op
!= TOK_SUBC1
) {
773 o(0xc0 | (opc
<< 3) | r
);
778 oad(0xc0 | (opc
<< 3) | r
, c
);
784 o((opc
<< 3) | 0x01);
785 o(0xc0 + r
+ fr
* 8);
788 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
794 case TOK_SUBC1
: /* sub with carry generation */
797 case TOK_ADDC2
: /* add with carry use */
800 case TOK_SUBC2
: /* sub with carry use */
817 o(0xaf0f); /* imul fr, r */
818 o(0xc0 + fr
+ r
* 8);
829 opc
= 0xc0 | (opc
<< 3);
830 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
835 c
= vtop
->c
.i
& 0x1f;
836 o(0xc1); /* shl/shr/sar $xxx, r */
840 /* we generate the shift in ecx */
843 o(0xd3); /* shl/shr/sar %cl, r */
854 /* first operand must be in eax */
855 /* XXX: need better constraint for second operand */
861 /* save EAX too if used otherwise */
862 save_reg_upstack(TREG_EAX
, 1);
863 if (op
== TOK_UMULL
) {
864 o(0xf7); /* mul fr */
869 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
870 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
873 o(0xf799); /* cltd, idiv fr, %eax */
876 if (op
== '%' || op
== TOK_UMOD
)
889 /* generate a floating point operation 'v = t1 op t2' instruction. The
890 two operands are guaranteed to have the same floating point type */
891 /* XXX: need to use ST1 too */
892 ST_FUNC
void gen_opf(int op
)
894 int a
, ft
, fc
, swapped
, r
;
896 /* convert constants to memory references */
897 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
902 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
905 /* must put at least one value in the floating point register */
906 if ((vtop
[-1].r
& VT_LVAL
) &&
907 (vtop
[0].r
& VT_LVAL
)) {
913 /* swap the stack if needed so that t1 is the register and t2 is
914 the memory reference */
915 if (vtop
[-1].r
& VT_LVAL
) {
919 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
920 /* load on stack second operand */
921 load(TREG_ST0
, vtop
);
922 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
923 if (op
== TOK_GE
|| op
== TOK_GT
)
925 else if (op
== TOK_EQ
|| op
== TOK_NE
)
928 o(0xc9d9); /* fxch %st(1) */
929 if (op
== TOK_EQ
|| op
== TOK_NE
)
930 o(0xe9da); /* fucompp */
932 o(0xd9de); /* fcompp */
933 o(0xe0df); /* fnstsw %ax */
935 o(0x45e480); /* and $0x45, %ah */
936 o(0x40fC80); /* cmp $0x40, %ah */
937 } else if (op
== TOK_NE
) {
938 o(0x45e480); /* and $0x45, %ah */
939 o(0x40f480); /* xor $0x40, %ah */
941 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
942 o(0x05c4f6); /* test $0x05, %ah */
945 o(0x45c4f6); /* test $0x45, %ah */
952 /* no memory reference possible for long double operations */
953 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
954 load(TREG_ST0
, vtop
);
979 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
980 o(0xde); /* fxxxp %st, %st(1) */
983 /* if saved lvalue, then we must reload it */
985 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
989 v1
.r
= VT_LOCAL
| VT_LVAL
;
995 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
999 gen_modrm(a
, r
, vtop
->sym
, fc
);
1005 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
1006 and 'long long' cases. */
1007 ST_FUNC
void gen_cvt_itof(int t
)
1011 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
1012 /* signed long long to float/double/long double (unsigned case
1013 is handled generically) */
1014 o(0x50 + vtop
->r2
); /* push r2 */
1015 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1016 o(0x242cdf); /* fildll (%esp) */
1017 o(0x08c483); /* add $8, %esp */
1018 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1019 (VT_INT
| VT_UNSIGNED
)) {
1020 /* unsigned int to float/double/long double */
1021 o(0x6a); /* push $0 */
1023 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1024 o(0x242cdf); /* fildll (%esp) */
1025 o(0x08c483); /* add $8, %esp */
1027 /* int to float/double/long double */
1028 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1029 o(0x2404db); /* fildl (%esp) */
1030 o(0x04c483); /* add $4, %esp */
1035 /* convert fp to int 't' type */
1036 ST_FUNC
void gen_cvt_ftoi(int t
)
1038 int bt
= vtop
->type
.t
& VT_BTYPE
;
1040 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1041 else if (bt
== VT_LDOUBLE
)
1042 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1044 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1049 vtop
->r2
= REG_LRET
;
1052 /* convert from one floating point type to another */
1053 ST_FUNC
void gen_cvt_ftof(int t
)
1055 /* all we have to do on i386 is to put the float in a register */
1059 /* computed goto support */
1060 ST_FUNC
void ggoto(void)
1066 /* bound check support functions */
1067 #ifdef CONFIG_TCC_BCHECK
1069 /* generate a bounded pointer addition */
1070 ST_FUNC
void gen_bounded_ptr_add(void)
1072 /* prepare fast i386 function call (args in eax and edx) */
1073 gv2(RC_EAX
, RC_EDX
);
1074 /* save all temporary registers */
1077 /* do a fast function call */
1078 gen_static_call(TOK___bound_ptr_add
);
1079 /* returned pointer is in eax */
1081 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1082 /* address of bounding function call point */
1083 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1086 /* patch pointer addition in vtop so that pointer dereferencing is
1088 ST_FUNC
void gen_bounded_ptr_deref(void)
1096 /* XXX: put that code in generic part of tcc */
1097 if (!is_float(vtop
->type
.t
)) {
1098 if (vtop
->r
& VT_LVAL_BYTE
)
1100 else if (vtop
->r
& VT_LVAL_SHORT
)
1104 size
= type_size(&vtop
->type
, &align
);
1106 case 1: func
= TOK___bound_ptr_indir1
; break;
1107 case 2: func
= TOK___bound_ptr_indir2
; break;
1108 case 4: func
= TOK___bound_ptr_indir4
; break;
1109 case 8: func
= TOK___bound_ptr_indir8
; break;
1110 case 12: func
= TOK___bound_ptr_indir12
; break;
1111 case 16: func
= TOK___bound_ptr_indir16
; break;
1113 tcc_error("unhandled size when dereferencing bounded pointer");
1118 /* patch relocation */
1119 /* XXX: find a better solution ? */
1120 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1121 sym
= external_global_sym(func
, &func_old_type
, 0);
1123 put_extern_sym(sym
, NULL
, 0, 0);
1124 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1128 /* Save the stack pointer onto the stack */
1129 ST_FUNC
void gen_vla_sp_save(int addr
) {
1130 /* mov %esp,addr(%ebp)*/
1132 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1135 /* Restore the SP from a location on the stack */
1136 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1138 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1141 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1142 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1143 #ifdef TCC_TARGET_PE
1144 /* 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 */
1150 r
= gv(RC_INT
); /* allocation size */
1154 /* We align to 16 bytes rather than align */
1161 /* end of X86 code generator */
1162 /*************************************************************/
1164 /*************************************************************/