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 ST_FUNC
void gen_fill_nops(int bytes
)
166 /* generate jmp to a label */
167 #define gjmp2(instr,lbl) oad(instr,lbl)
169 /* output constant with relocation if 'r & VT_SYM' is true */
170 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
173 greloc(cur_text_section
, sym
, ind
, R_386_32
);
177 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
180 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
184 /* generate a modrm reference. 'op_reg' contains the additional 3
186 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
188 op_reg
= op_reg
<< 3;
189 if ((r
& VT_VALMASK
) == VT_CONST
) {
190 /* constant memory reference */
192 gen_addr32(r
, sym
, c
);
193 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
194 /* currently, we use only ebp as base */
196 /* short reference */
200 oad(0x85 | op_reg
, c
);
203 g(0x00 | op_reg
| (r
& VT_VALMASK
));
207 /* load 'r' from value 'sv' */
208 ST_FUNC
void load(int r
, SValue
*sv
)
210 int v
, t
, ft
, fc
, fr
;
215 sv
= pe_getimport(sv
, &v2
);
219 ft
= sv
->type
.t
& ~VT_DEFSIGN
;
222 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
226 if (v
== VT_LLOCAL
) {
228 v1
.r
= VT_LOCAL
| VT_LVAL
;
231 if (!(reg_classes
[fr
] & RC_INT
))
232 fr
= get_reg(RC_INT
);
235 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
238 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
241 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
244 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
245 o(0xbe0f); /* movsbl */
246 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
247 o(0xb60f); /* movzbl */
248 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
249 o(0xbf0f); /* movswl */
250 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
251 o(0xb70f); /* movzwl */
255 gen_modrm(r
, fr
, sv
->sym
, fc
);
258 o(0xb8 + r
); /* mov $xx, r */
259 gen_addr32(fr
, sv
->sym
, fc
);
260 } else if (v
== VT_LOCAL
) {
262 o(0x8d); /* lea xxx(%ebp), r */
263 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
266 o(0xe8 + r
); /* mov %ebp, r */
268 } else if (v
== VT_CMP
) {
269 oad(0xb8 + r
, 0); /* mov $0, r */
270 o(0x0f); /* setxx %br */
273 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
275 oad(0xb8 + r
, t
); /* mov $1, r */
276 o(0x05eb); /* jmp after */
278 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
281 o(0xc0 + r
+ v
* 8); /* mov v, r */
286 /* store register 'r' in lvalue 'v' */
287 ST_FUNC
void store(int r
, SValue
*v
)
293 v
= pe_getimport(v
, &v2
);
298 fr
= v
->r
& VT_VALMASK
;
299 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
301 /* XXX: incorrect if float reg to reg */
302 if (bt
== VT_FLOAT
) {
305 } else if (bt
== VT_DOUBLE
) {
308 } else if (bt
== VT_LDOUBLE
) {
309 o(0xc0d9); /* fld %st(0) */
315 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
320 if (fr
== VT_CONST
||
323 gen_modrm(r
, v
->r
, v
->sym
, fc
);
324 } else if (fr
!= r
) {
325 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
329 static void gadd_sp(int val
)
331 if (val
== (char)val
) {
335 oad(0xc481, val
); /* add $xxx, %esp */
339 #if defined CONFIG_TCC_BCHECK || defined TCC_TARGET_PE
340 static void gen_static_call(int v
)
344 sym
= external_global_sym(v
, &func_old_type
);
346 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
350 /* 'is_jmp' is '1' if it is a jump */
351 static void gcall_or_jmp(int is_jmp
)
354 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&& (vtop
->r
& VT_SYM
)) {
355 /* constant and relocation case */
356 greloc(cur_text_section
, vtop
->sym
, ind
+ 1, R_386_PC32
);
357 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
359 /* otherwise, indirect call */
361 o(0xff); /* call/jmp *r */
362 o(0xd0 + r
+ (is_jmp
<< 4));
366 /* extend the return value to the whole register if necessary
367 visual studio and gcc do not always set the whole eax register
368 when assigning the return value of a function */
369 rt
= vtop
->type
.ref
->type
.t
;
370 switch (rt
& VT_BTYPE
) {
373 if (rt
& VT_UNSIGNED
) {
374 o(0xc0b60f); /* movzx %al, %eax */
377 o(0xc0be0f); /* movsx %al, %eax */
381 if (rt
& VT_UNSIGNED
) {
382 o(0xc0b70f); /* movzx %ax, %eax */
385 o(0xc0bf0f); /* movsx %ax, %eax */
394 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
395 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
397 /* Return the number of registers needed to return the struct, or 0 if
398 returning via struct pointer. */
399 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
403 *ret_align
= 1; // Never have to re-align return values for x86
405 size
= type_size(vt
, &align
);
406 if (size
> 8 || (size
& (size
- 1)))
419 *ret_align
= 1; // Never have to re-align return values for x86
424 /* Generate function call. The function address is pushed first, then
425 all the parameters in call order. This functions pops all the
426 parameters and the function address. */
427 ST_FUNC
void gfunc_call(int nb_args
)
429 int size
, align
, r
, args_size
, i
, func_call
;
433 for(i
= 0;i
< nb_args
; i
++) {
434 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
435 size
= type_size(&vtop
->type
, &align
);
436 /* align to stack align size */
437 size
= (size
+ 3) & ~3;
438 /* allocate the necessary size on stack */
439 oad(0xec81, size
); /* sub $xxx, %esp */
440 /* generate structure store */
442 o(0x89); /* mov %esp, r */
444 vset(&vtop
->type
, r
| VT_LVAL
, 0);
448 } else if (is_float(vtop
->type
.t
)) {
449 gv(RC_FLOAT
); /* only one float register */
450 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
452 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
456 oad(0xec81, size
); /* sub $xxx, %esp */
460 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
465 /* simple type (currently always same size) */
466 /* XXX: implicit cast ? */
468 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
470 o(0x50 + vtop
->r2
); /* push r */
474 o(0x50 + r
); /* push r */
479 save_regs(0); /* save used temporary registers */
480 func_sym
= vtop
->type
.ref
;
481 func_call
= func_sym
->f
.func_call
;
483 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
484 func_call
== FUNC_FASTCALLW
) {
485 int fastcall_nb_regs
;
486 uint8_t *fastcall_regs_ptr
;
487 if (func_call
== FUNC_FASTCALLW
) {
488 fastcall_regs_ptr
= fastcallw_regs
;
489 fastcall_nb_regs
= 2;
491 fastcall_regs_ptr
= fastcall_regs
;
492 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
494 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
497 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
498 /* XXX: incorrect for struct/floats */
502 #ifndef TCC_TARGET_PE
503 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
508 if (args_size
&& func_call
!= FUNC_STDCALL
&& func_call
!= FUNC_FASTCALLW
)
514 #define FUNC_PROLOG_SIZE (10 + USE_EBX)
516 #define FUNC_PROLOG_SIZE (9 + USE_EBX)
519 /* generate function prolog of type 't' */
520 ST_FUNC
void gfunc_prolog(CType
*func_type
)
522 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
523 int param_index
, param_addr
;
524 uint8_t *fastcall_regs_ptr
;
528 sym
= func_type
->ref
;
529 func_call
= sym
->f
.func_call
;
534 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
535 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
536 fastcall_regs_ptr
= fastcall_regs
;
537 } else if (func_call
== FUNC_FASTCALLW
) {
538 fastcall_nb_regs
= 2;
539 fastcall_regs_ptr
= fastcallw_regs
;
541 fastcall_nb_regs
= 0;
542 fastcall_regs_ptr
= NULL
;
546 ind
+= FUNC_PROLOG_SIZE
;
547 func_sub_sp_offset
= ind
;
548 /* if the function returns a structure, then add an
549 implicit pointer parameter */
551 func_var
= (sym
->f
.func_type
== FUNC_ELLIPSIS
);
553 size
= type_size(&func_vt
,&align
);
554 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
)
555 && (size
> 8 || (size
& (size
- 1)))) {
557 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
559 /* XXX: fastcall case ? */
564 /* define parameters */
565 while ((sym
= sym
->next
) != NULL
) {
567 size
= type_size(type
, &align
);
568 size
= (size
+ 3) & ~3;
569 #ifdef FUNC_STRUCT_PARAM_AS_PTR
570 /* structs are passed as pointer */
571 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
575 if (param_index
< fastcall_nb_regs
) {
576 /* save FASTCALL register */
579 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
585 sym_push(sym
->v
& ~SYM_FIELD
, type
,
586 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
590 /* pascal type call or fastcall ? */
591 if (func_call
== FUNC_STDCALL
|| func_call
== FUNC_FASTCALLW
)
592 func_ret_sub
= addr
- 8;
593 #ifndef TCC_TARGET_PE
598 #ifdef CONFIG_TCC_BCHECK
599 /* leave some room for bound checking code */
600 if (tcc_state
->do_bounds_check
) {
601 func_bound_offset
= lbounds_section
->data_offset
;
602 func_bound_ind
= ind
;
603 oad(0xb8, 0); /* lbound section pointer */
604 oad(0xb8, 0); /* call to function */
609 /* generate function epilog */
610 ST_FUNC
void gfunc_epilog(void)
614 #ifdef CONFIG_TCC_BCHECK
615 if (tcc_state
->do_bounds_check
616 && func_bound_offset
!= lbounds_section
->data_offset
) {
621 /* add end of table info */
622 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
625 /* generate bound local allocation */
627 ind
= func_bound_ind
;
628 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
629 func_bound_offset
, lbounds_section
->data_offset
);
630 greloc(cur_text_section
, sym_data
,
632 oad(0xb8, 0); /* mov %eax, xxx */
633 gen_static_call(TOK___bound_local_new
);
636 /* generate bound check local freeing */
637 o(0x5250); /* save returned value, if any */
638 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
639 oad(0xb8, 0); /* mov %eax, xxx */
640 gen_static_call(TOK___bound_local_delete
);
641 o(0x585a); /* restore returned value, if any */
645 /* align local size to word & save local variables */
650 gen_modrm(TREG_EBX
, VT_LOCAL
, NULL
, -(v
+4));
654 if (func_ret_sub
== 0) {
659 g(func_ret_sub
>> 8);
662 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
665 oad(0xb8, v
); /* mov stacksize, %eax */
666 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
670 o(0xe58955); /* push %ebp, mov %esp, %ebp */
671 o(0xec81); /* sub esp, stacksize */
674 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
677 o(0x53 * USE_EBX
); /* push ebx */
681 /* generate a jump to a label */
682 ST_FUNC
int gjmp(int t
)
684 return gjmp2(0xe9, t
);
687 /* generate a jump to a fixed address */
688 ST_FUNC
void gjmp_addr(int a
)
696 oad(0xe9, a
- ind
- 5);
700 ST_FUNC
void gtst_addr(int inv
, int a
)
702 int v
= vtop
->r
& VT_VALMASK
;
704 inv
^= (vtop
--)->c
.i
;
711 oad(inv
- 16, a
- 4);
713 } else if ((v
& ~1) == VT_JMP
) {
714 if ((v
& 1) != inv
) {
726 /* generate a test. set 'inv' to invert test. Stack entry is popped */
727 ST_FUNC
int gtst(int inv
, int t
)
729 int v
= vtop
->r
& VT_VALMASK
;
732 } else if (v
== VT_CMP
) {
733 /* fast case : can jump directly since flags are set */
735 t
= gjmp2((vtop
->c
.i
- 16) ^ inv
, t
);
736 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
737 /* && or || optimization */
738 if ((v
& 1) == inv
) {
739 /* insert vtop->c jump list in t */
740 uint32_t n1
, n
= vtop
->c
.i
;
742 while ((n1
= read32le(cur_text_section
->data
+ n
)))
744 write32le(cur_text_section
->data
+ n
, t
);
756 /* generate an integer binary operation */
757 ST_FUNC
void gen_opi(int op
)
763 case TOK_ADDC1
: /* add with carry generation */
766 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
773 /* generate inc and dec for smaller code */
774 if (c
==1 && opc
==0 && op
!= TOK_ADDC1
) {
776 } else if (c
==1 && opc
==5 && op
!= TOK_SUBC1
) {
780 o(0xc0 | (opc
<< 3) | r
);
785 oad(0xc0 | (opc
<< 3) | r
, c
);
791 o((opc
<< 3) | 0x01);
792 o(0xc0 + r
+ fr
* 8);
795 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
801 case TOK_SUBC1
: /* sub with carry generation */
804 case TOK_ADDC2
: /* add with carry use */
807 case TOK_SUBC2
: /* sub with carry use */
824 o(0xaf0f); /* imul fr, r */
825 o(0xc0 + fr
+ r
* 8);
836 opc
= 0xc0 | (opc
<< 3);
837 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
842 c
= vtop
->c
.i
& 0x1f;
843 o(0xc1); /* shl/shr/sar $xxx, r */
847 /* we generate the shift in ecx */
850 o(0xd3); /* shl/shr/sar %cl, r */
861 /* first operand must be in eax */
862 /* XXX: need better constraint for second operand */
868 /* save EAX too if used otherwise */
869 save_reg_upstack(TREG_EAX
, 1);
870 if (op
== TOK_UMULL
) {
871 o(0xf7); /* mul fr */
876 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
877 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
880 o(0xf799); /* cltd, idiv fr, %eax */
883 if (op
== '%' || op
== TOK_UMOD
)
896 /* generate a floating point operation 'v = t1 op t2' instruction. The
897 two operands are guaranteed to have the same floating point type */
898 /* XXX: need to use ST1 too */
899 ST_FUNC
void gen_opf(int op
)
901 int a
, ft
, fc
, swapped
, r
;
903 /* convert constants to memory references */
904 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
909 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
912 /* must put at least one value in the floating point register */
913 if ((vtop
[-1].r
& VT_LVAL
) &&
914 (vtop
[0].r
& VT_LVAL
)) {
920 /* swap the stack if needed so that t1 is the register and t2 is
921 the memory reference */
922 if (vtop
[-1].r
& VT_LVAL
) {
926 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
927 /* load on stack second operand */
928 load(TREG_ST0
, vtop
);
929 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
930 if (op
== TOK_GE
|| op
== TOK_GT
)
932 else if (op
== TOK_EQ
|| op
== TOK_NE
)
935 o(0xc9d9); /* fxch %st(1) */
936 if (op
== TOK_EQ
|| op
== TOK_NE
)
937 o(0xe9da); /* fucompp */
939 o(0xd9de); /* fcompp */
940 o(0xe0df); /* fnstsw %ax */
942 o(0x45e480); /* and $0x45, %ah */
943 o(0x40fC80); /* cmp $0x40, %ah */
944 } else if (op
== TOK_NE
) {
945 o(0x45e480); /* and $0x45, %ah */
946 o(0x40f480); /* xor $0x40, %ah */
948 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
949 o(0x05c4f6); /* test $0x05, %ah */
952 o(0x45c4f6); /* test $0x45, %ah */
959 /* no memory reference possible for long double operations */
960 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
961 load(TREG_ST0
, vtop
);
986 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
987 o(0xde); /* fxxxp %st, %st(1) */
990 /* if saved lvalue, then we must reload it */
992 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
996 v1
.r
= VT_LOCAL
| VT_LVAL
;
1002 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
1006 gen_modrm(a
, r
, vtop
->sym
, fc
);
1012 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
1013 and 'long long' cases. */
1014 ST_FUNC
void gen_cvt_itof(int t
)
1018 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
1019 /* signed long long to float/double/long double (unsigned case
1020 is handled generically) */
1021 o(0x50 + vtop
->r2
); /* push r2 */
1022 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1023 o(0x242cdf); /* fildll (%esp) */
1024 o(0x08c483); /* add $8, %esp */
1025 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1026 (VT_INT
| VT_UNSIGNED
)) {
1027 /* unsigned int to float/double/long double */
1028 o(0x6a); /* push $0 */
1030 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1031 o(0x242cdf); /* fildll (%esp) */
1032 o(0x08c483); /* add $8, %esp */
1034 /* int to float/double/long double */
1035 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1036 o(0x2404db); /* fildl (%esp) */
1037 o(0x04c483); /* add $4, %esp */
1042 /* convert fp to int 't' type */
1043 ST_FUNC
void gen_cvt_ftoi(int t
)
1045 int bt
= vtop
->type
.t
& VT_BTYPE
;
1047 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1048 else if (bt
== VT_LDOUBLE
)
1049 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1051 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1056 vtop
->r2
= REG_LRET
;
1059 /* convert from one floating point type to another */
1060 ST_FUNC
void gen_cvt_ftof(int t
)
1062 /* all we have to do on i386 is to put the float in a register */
1066 /* computed goto support */
1067 ST_FUNC
void ggoto(void)
1073 /* bound check support functions */
1074 #ifdef CONFIG_TCC_BCHECK
1076 /* generate a bounded pointer addition */
1077 ST_FUNC
void gen_bounded_ptr_add(void)
1079 /* prepare fast i386 function call (args in eax and edx) */
1080 gv2(RC_EAX
, RC_EDX
);
1081 /* save all temporary registers */
1084 /* do a fast function call */
1085 gen_static_call(TOK___bound_ptr_add
);
1086 /* returned pointer is in eax */
1088 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1089 /* address of bounding function call point */
1090 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1093 /* patch pointer addition in vtop so that pointer dereferencing is
1095 ST_FUNC
void gen_bounded_ptr_deref(void)
1103 /* XXX: put that code in generic part of tcc */
1104 if (!is_float(vtop
->type
.t
)) {
1105 if (vtop
->r
& VT_LVAL_BYTE
)
1107 else if (vtop
->r
& VT_LVAL_SHORT
)
1111 size
= type_size(&vtop
->type
, &align
);
1113 case 1: func
= TOK___bound_ptr_indir1
; break;
1114 case 2: func
= TOK___bound_ptr_indir2
; break;
1115 case 4: func
= TOK___bound_ptr_indir4
; break;
1116 case 8: func
= TOK___bound_ptr_indir8
; break;
1117 case 12: func
= TOK___bound_ptr_indir12
; break;
1118 case 16: func
= TOK___bound_ptr_indir16
; break;
1120 tcc_error("unhandled size when dereferencing bounded pointer");
1125 /* patch relocation */
1126 /* XXX: find a better solution ? */
1127 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1128 sym
= external_global_sym(func
, &func_old_type
);
1130 put_extern_sym(sym
, NULL
, 0, 0);
1131 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1135 /* Save the stack pointer onto the stack */
1136 ST_FUNC
void gen_vla_sp_save(int addr
) {
1137 /* mov %esp,addr(%ebp)*/
1139 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1142 /* Restore the SP from a location on the stack */
1143 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1145 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1148 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1149 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1150 #ifdef TCC_TARGET_PE
1151 /* alloca does more than just adjust %rsp on Windows */
1152 vpush_global_sym(&func_old_type
, TOK_alloca
);
1153 vswap(); /* Move alloca ref past allocation size */
1157 r
= gv(RC_INT
); /* allocation size */
1161 /* We align to 16 bytes rather than align */
1168 /* end of X86 code generator */
1169 /*************************************************************/
1171 /*************************************************************/