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 */
27 /* a register can belong to several classes. The classes must be
28 sorted from more general to more precise (see gv2() code which does
29 assumptions on it). */
30 #define RC_INT 0x0001 /* generic integer register */
31 #define RC_FLOAT 0x0002 /* generic float register */
36 #define RC_IRET RC_EAX /* function return: integer register */
37 #define RC_LRET RC_EDX /* function return: second integer register */
38 #define RC_FRET RC_ST0 /* function return: float register */
40 /* pretty names for the registers */
49 /* return registers for function */
50 #define REG_IRET TREG_EAX /* single word int return register */
51 #define REG_LRET TREG_EDX /* second word return register (for long long) */
52 #define REG_FRET TREG_ST0 /* float return register */
54 /* defined if function parameters must be evaluated in reverse order */
55 #define INVERT_FUNC_PARAMS
57 /* defined if structures are passed as pointers. Otherwise structures
58 are directly pushed on stack. */
59 /* #define FUNC_STRUCT_PARAM_AS_PTR */
61 /* pointer size, in bytes */
64 /* long double size and alignment, in bytes */
65 #define LDOUBLE_SIZE 12
66 #define LDOUBLE_ALIGN 4
67 /* maximum alignment (for aligned attribute support) */
73 /******************************************************/
76 #define EM_TCC_TARGET EM_386
78 /* relocation type for 32 bit data relocation */
79 #define R_DATA_32 R_386_32
80 #define R_DATA_PTR R_386_32
81 #define R_JMP_SLOT R_386_JMP_SLOT
82 #define R_COPY R_386_COPY
84 #define ELF_START_ADDR 0x08048000
85 #define ELF_PAGE_SIZE 0x1000
87 /******************************************************/
88 #else /* ! TARGET_DEFS_ONLY */
89 /******************************************************/
92 ST_DATA
const int reg_classes
[NB_REGS
] = {
93 /* eax */ RC_INT
| RC_EAX
,
94 /* ecx */ RC_INT
| RC_ECX
,
95 /* edx */ RC_INT
| RC_EDX
,
96 /* st0 */ RC_FLOAT
| RC_ST0
,
99 static unsigned long func_sub_sp_offset
;
100 static int func_ret_sub
;
101 #ifdef CONFIG_TCC_BCHECK
102 static unsigned long func_bound_offset
;
105 /* XXX: make it faster ? */
106 ST_FUNC
void g(int c
)
110 if (ind1
> cur_text_section
->data_allocated
)
111 section_realloc(cur_text_section
, ind1
);
112 cur_text_section
->data
[ind
] = c
;
116 ST_FUNC
void o(unsigned int c
)
124 ST_FUNC
void gen_le16(int v
)
130 ST_FUNC
void gen_le32(int c
)
138 /* output a symbol and patch all calls to it */
139 ST_FUNC
void gsym_addr(int t
, int a
)
143 ptr
= (int *)(cur_text_section
->data
+ t
);
144 n
= *ptr
; /* next value */
150 ST_FUNC
void gsym(int t
)
155 /* psym is used to put an instruction with a data field which is a
156 reference to a symbol. It is in fact the same as oad ! */
159 /* instruction + 4 bytes data. Return the address of the data */
160 ST_FUNC
int oad(int c
, int s
)
166 if (ind1
> cur_text_section
->data_allocated
)
167 section_realloc(cur_text_section
, ind1
);
168 *(int *)(cur_text_section
->data
+ ind
) = s
;
174 /* output constant with relocation if 'r & VT_SYM' is true */
175 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
178 greloc(cur_text_section
, sym
, ind
, R_386_32
);
182 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
185 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
189 /* generate a modrm reference. 'op_reg' contains the addtionnal 3
191 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
193 op_reg
= op_reg
<< 3;
194 if ((r
& VT_VALMASK
) == VT_CONST
) {
195 /* constant memory reference */
197 gen_addr32(r
, sym
, c
);
198 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
199 /* currently, we use only ebp as base */
201 /* short reference */
205 oad(0x85 | op_reg
, c
);
208 g(0x00 | op_reg
| (r
& VT_VALMASK
));
212 /* load 'r' from value 'sv' */
213 ST_FUNC
void load(int r
, SValue
*sv
)
215 int v
, t
, ft
, fc
, fr
;
220 sv
= pe_getimport(sv
, &v2
);
229 if (v
== VT_LLOCAL
) {
231 v1
.r
= VT_LOCAL
| VT_LVAL
;
234 if (!(reg_classes
[fr
] & RC_INT
))
235 fr
= get_reg(RC_INT
);
238 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
241 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
244 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
247 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
248 o(0xbe0f); /* movsbl */
249 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
250 o(0xb60f); /* movzbl */
251 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
252 o(0xbf0f); /* movswl */
253 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
254 o(0xb70f); /* movzwl */
258 gen_modrm(r
, fr
, sv
->sym
, fc
);
261 o(0xb8 + r
); /* mov $xx, r */
262 gen_addr32(fr
, sv
->sym
, fc
);
263 } else if (v
== VT_LOCAL
) {
265 o(0x8d); /* lea xxx(%ebp), r */
266 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
269 o(0xe8 + r
); /* mov %ebp, r */
271 } else if (v
== VT_CMP
) {
272 oad(0xb8 + r
, 0); /* mov $0, r */
273 o(0x0f); /* setxx %br */
276 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
278 oad(0xb8 + r
, t
); /* mov $1, r */
279 o(0x05eb); /* jmp after */
281 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
284 o(0xc0 + r
+ v
* 8); /* mov v, r */
289 /* store register 'r' in lvalue 'v' */
290 ST_FUNC
void store(int r
, SValue
*v
)
296 v
= pe_getimport(v
, &v2
);
301 fr
= v
->r
& VT_VALMASK
;
303 /* XXX: incorrect if float reg to reg */
304 if (bt
== VT_FLOAT
) {
307 } else if (bt
== VT_DOUBLE
) {
310 } else if (bt
== VT_LDOUBLE
) {
311 o(0xc0d9); /* fld %st(0) */
317 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
322 if (fr
== VT_CONST
||
325 gen_modrm(r
, v
->r
, v
->sym
, fc
);
326 } else if (fr
!= r
) {
327 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
331 static void gadd_sp(int val
)
333 if (val
== (char)val
) {
337 oad(0xc481, val
); /* add $xxx, %esp */
341 /* 'is_jmp' is '1' if it is a jump */
342 static void gcall_or_jmp(int is_jmp
)
345 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
347 if (vtop
->r
& VT_SYM
) {
348 /* relocation case */
349 greloc(cur_text_section
, vtop
->sym
,
350 ind
+ 1, R_386_PC32
);
352 /* put an empty PC32 relocation */
353 put_elf_reloc(symtab_section
, cur_text_section
,
354 ind
+ 1, R_386_PC32
, 0);
356 oad(0xe8 + is_jmp
, vtop
->c
.ul
- 4); /* call/jmp im */
358 /* otherwise, indirect call */
360 o(0xff); /* call/jmp *r */
361 o(0xd0 + r
+ (is_jmp
<< 4));
365 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
366 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
368 /* Return 1 if this function returns via an sret pointer, 0 otherwise */
369 ST_FUNC
int gfunc_sret(CType
*vt
, CType
*ret
, int *ret_align
)
374 *ret_align
= 1; // Never have to re-align return values for x86
375 size
= type_size(vt
, &align
);
378 } else if (size
> 4) {
388 *ret_align
= 1; // Never have to re-align return values for x86
393 /* Generate function call. The function address is pushed first, then
394 all the parameters in call order. This functions pops all the
395 parameters and the function address. */
396 ST_FUNC
void gfunc_call(int nb_args
)
398 int size
, align
, r
, args_size
, i
, func_call
;
402 for(i
= 0;i
< nb_args
; i
++) {
403 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
404 size
= type_size(&vtop
->type
, &align
);
405 /* align to stack align size */
406 size
= (size
+ 3) & ~3;
407 /* allocate the necessary size on stack */
408 oad(0xec81, size
); /* sub $xxx, %esp */
409 /* generate structure store */
411 o(0x89); /* mov %esp, r */
413 vset(&vtop
->type
, r
| VT_LVAL
, 0);
417 } else if (is_float(vtop
->type
.t
)) {
418 gv(RC_FLOAT
); /* only one float register */
419 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
421 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
425 oad(0xec81, size
); /* sub $xxx, %esp */
429 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
434 /* simple type (currently always same size) */
435 /* XXX: implicit cast ? */
437 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
439 o(0x50 + vtop
->r2
); /* push r */
443 o(0x50 + r
); /* push r */
448 save_regs(0); /* save used temporary registers */
449 func_sym
= vtop
->type
.ref
;
450 func_call
= FUNC_CALL(func_sym
->r
);
452 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
453 func_call
== FUNC_FASTCALLW
) {
454 int fastcall_nb_regs
;
455 uint8_t *fastcall_regs_ptr
;
456 if (func_call
== FUNC_FASTCALLW
) {
457 fastcall_regs_ptr
= fastcallw_regs
;
458 fastcall_nb_regs
= 2;
460 fastcall_regs_ptr
= fastcall_regs
;
461 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
463 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
466 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
467 /* XXX: incorrect for struct/floats */
471 #ifndef TCC_TARGET_PE
472 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
477 if (args_size
&& func_call
!= FUNC_STDCALL
)
483 #define FUNC_PROLOG_SIZE 10
485 #define FUNC_PROLOG_SIZE 9
488 /* generate function prolog of type 't' */
489 ST_FUNC
void gfunc_prolog(CType
*func_type
)
491 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
492 int param_index
, param_addr
;
493 uint8_t *fastcall_regs_ptr
;
497 sym
= func_type
->ref
;
498 func_call
= FUNC_CALL(sym
->r
);
503 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
504 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
505 fastcall_regs_ptr
= fastcall_regs
;
506 } else if (func_call
== FUNC_FASTCALLW
) {
507 fastcall_nb_regs
= 2;
508 fastcall_regs_ptr
= fastcallw_regs
;
510 fastcall_nb_regs
= 0;
511 fastcall_regs_ptr
= NULL
;
515 ind
+= FUNC_PROLOG_SIZE
;
516 func_sub_sp_offset
= ind
;
517 /* if the function returns a structure, then add an
518 implicit pointer parameter */
521 size
= type_size(&func_vt
,&align
);
522 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) && (size
> 8)) {
524 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
526 /* XXX: fastcall case ? */
531 /* define parameters */
532 while ((sym
= sym
->next
) != NULL
) {
534 size
= type_size(type
, &align
);
535 size
= (size
+ 3) & ~3;
536 #ifdef FUNC_STRUCT_PARAM_AS_PTR
537 /* structs are passed as pointer */
538 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
542 if (param_index
< fastcall_nb_regs
) {
543 /* save FASTCALL register */
546 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
552 sym_push(sym
->v
& ~SYM_FIELD
, type
,
553 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
557 /* pascal type call ? */
558 if (func_call
== FUNC_STDCALL
)
559 func_ret_sub
= addr
- 8;
560 #ifndef TCC_TARGET_PE
565 #ifdef CONFIG_TCC_BCHECK
566 /* leave some room for bound checking code */
567 if (tcc_state
->do_bounds_check
) {
568 oad(0xb8, 0); /* lbound section pointer */
569 oad(0xb8, 0); /* call to function */
570 func_bound_offset
= lbounds_section
->data_offset
;
575 /* generate function epilog */
576 ST_FUNC
void gfunc_epilog(void)
580 #ifdef CONFIG_TCC_BCHECK
581 if (tcc_state
->do_bounds_check
582 && func_bound_offset
!= lbounds_section
->data_offset
) {
586 /* add end of table info */
587 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(int));
589 /* generate bound local allocation */
591 ind
= func_sub_sp_offset
;
592 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
593 func_bound_offset
, lbounds_section
->data_offset
);
594 greloc(cur_text_section
, sym_data
,
596 oad(0xb8, 0); /* mov %eax, xxx */
597 sym
= external_global_sym(TOK___bound_local_new
, &func_old_type
, 0);
598 greloc(cur_text_section
, sym
,
599 ind
+ 1, R_386_PC32
);
602 /* generate bound check local freeing */
603 o(0x5250); /* save returned value, if any */
604 greloc(cur_text_section
, sym_data
,
606 oad(0xb8, 0); /* mov %eax, xxx */
607 sym
= external_global_sym(TOK___bound_local_delete
, &func_old_type
, 0);
608 greloc(cur_text_section
, sym
,
609 ind
+ 1, R_386_PC32
);
611 o(0x585a); /* restore returned value, if any */
615 if (func_ret_sub
== 0) {
620 g(func_ret_sub
>> 8);
622 /* align local size to word & save local variables */
626 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
629 Sym
*sym
= external_global_sym(TOK___chkstk
, &func_old_type
, 0);
630 oad(0xb8, v
); /* mov stacksize, %eax */
631 oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
632 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
636 o(0xe58955); /* push %ebp, mov %esp, %ebp */
637 o(0xec81); /* sub esp, stacksize */
639 #if FUNC_PROLOG_SIZE == 10
640 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
646 /* generate a jump to a label */
647 ST_FUNC
int gjmp(int t
)
649 return psym(0xe9, t
);
652 /* generate a jump to a fixed address */
653 ST_FUNC
void gjmp_addr(int a
)
661 oad(0xe9, a
- ind
- 5);
665 /* generate a test. set 'inv' to invert test. Stack entry is popped */
666 ST_FUNC
int gtst(int inv
, int t
)
670 v
= vtop
->r
& VT_VALMASK
;
672 /* fast case : can jump directly since flags are set */
674 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
675 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
676 /* && or || optimization */
677 if ((v
& 1) == inv
) {
678 /* insert vtop->c jump list in t */
681 p
= (int *)(cur_text_section
->data
+ *p
);
689 if (is_float(vtop
->type
.t
) ||
690 (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
694 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
695 /* constant jmp optimization */
696 if ((vtop
->c
.i
!= 0) != inv
)
703 t
= psym(0x85 ^ inv
, t
);
710 /* generate an integer binary operation */
711 ST_FUNC
void gen_opi(int op
)
717 case TOK_ADDC1
: /* add with carry generation */
720 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
727 /* generate inc and dec for smaller code */
728 if (c
==1 && opc
==0) {
730 } else if (c
==1 && opc
==5) {
734 o(0xc0 | (opc
<< 3) | r
);
739 oad(0xc0 | (opc
<< 3) | r
, c
);
745 o((opc
<< 3) | 0x01);
746 o(0xc0 + r
+ fr
* 8);
749 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
755 case TOK_SUBC1
: /* sub with carry generation */
758 case TOK_ADDC2
: /* add with carry use */
761 case TOK_SUBC2
: /* sub with carry use */
778 o(0xaf0f); /* imul fr, r */
779 o(0xc0 + fr
+ r
* 8);
790 opc
= 0xc0 | (opc
<< 3);
791 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
796 c
= vtop
->c
.i
& 0x1f;
797 o(0xc1); /* shl/shr/sar $xxx, r */
801 /* we generate the shift in ecx */
804 o(0xd3); /* shl/shr/sar %cl, r */
815 /* first operand must be in eax */
816 /* XXX: need better constraint for second operand */
822 if (op
== TOK_UMULL
) {
823 o(0xf7); /* mul fr */
828 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
829 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
832 o(0xf799); /* cltd, idiv fr, %eax */
835 if (op
== '%' || op
== TOK_UMOD
)
848 /* generate a floating point operation 'v = t1 op t2' instruction. The
849 two operands are guaranted to have the same floating point type */
850 /* XXX: need to use ST1 too */
851 ST_FUNC
void gen_opf(int op
)
853 int a
, ft
, fc
, swapped
, r
;
855 /* convert constants to memory references */
856 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
861 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
864 /* must put at least one value in the floating point register */
865 if ((vtop
[-1].r
& VT_LVAL
) &&
866 (vtop
[0].r
& VT_LVAL
)) {
872 /* swap the stack if needed so that t1 is the register and t2 is
873 the memory reference */
874 if (vtop
[-1].r
& VT_LVAL
) {
878 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
879 /* load on stack second operand */
880 load(TREG_ST0
, vtop
);
881 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
882 if (op
== TOK_GE
|| op
== TOK_GT
)
884 else if (op
== TOK_EQ
|| op
== TOK_NE
)
887 o(0xc9d9); /* fxch %st(1) */
888 o(0xe9da); /* fucompp */
889 o(0xe0df); /* fnstsw %ax */
891 o(0x45e480); /* and $0x45, %ah */
892 o(0x40fC80); /* cmp $0x40, %ah */
893 } else if (op
== TOK_NE
) {
894 o(0x45e480); /* and $0x45, %ah */
895 o(0x40f480); /* xor $0x40, %ah */
897 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
898 o(0x05c4f6); /* test $0x05, %ah */
901 o(0x45c4f6); /* test $0x45, %ah */
908 /* no memory reference possible for long double operations */
909 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
910 load(TREG_ST0
, vtop
);
935 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
936 o(0xde); /* fxxxp %st, %st(1) */
939 /* if saved lvalue, then we must reload it */
941 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
945 v1
.r
= VT_LOCAL
| VT_LVAL
;
951 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
955 gen_modrm(a
, r
, vtop
->sym
, fc
);
961 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
962 and 'long long' cases. */
963 ST_FUNC
void gen_cvt_itof(int t
)
967 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
968 /* signed long long to float/double/long double (unsigned case
969 is handled generically) */
970 o(0x50 + vtop
->r2
); /* push r2 */
971 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
972 o(0x242cdf); /* fildll (%esp) */
973 o(0x08c483); /* add $8, %esp */
974 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
975 (VT_INT
| VT_UNSIGNED
)) {
976 /* unsigned int to float/double/long double */
977 o(0x6a); /* push $0 */
979 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
980 o(0x242cdf); /* fildll (%esp) */
981 o(0x08c483); /* add $8, %esp */
983 /* int to float/double/long double */
984 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
985 o(0x2404db); /* fildl (%esp) */
986 o(0x04c483); /* add $4, %esp */
991 /* convert fp to int 't' type */
992 /* XXX: handle long long case */
993 ST_FUNC
void gen_cvt_ftoi(int t
)
999 ushort_type
.t
= VT_SHORT
| VT_UNSIGNED
;
1000 ushort_type
.ref
= 0;
1008 o(0x2dd9); /* ldcw xxx */
1009 sym
= external_global_sym(TOK___tcc_int_fpu_control
,
1010 &ushort_type
, VT_LVAL
);
1011 greloc(cur_text_section
, sym
,
1015 oad(0xec81, size
); /* sub $xxx, %esp */
1017 o(0x1cdb); /* fistpl */
1019 o(0x3cdf); /* fistpll */
1021 o(0x2dd9); /* ldcw xxx */
1022 sym
= external_global_sym(TOK___tcc_fpu_control
,
1023 &ushort_type
, VT_LVAL
);
1024 greloc(cur_text_section
, sym
,
1028 r
= get_reg(RC_INT
);
1029 o(0x58 + r
); /* pop r */
1031 if (t
== VT_LLONG
) {
1032 vtop
->r
= r
; /* mark reg as used */
1033 r2
= get_reg(RC_INT
);
1034 o(0x58 + r2
); /* pop r2 */
1037 o(0x04c483); /* add $4, %esp */
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
1060 /* generate a bounded pointer addition */
1061 ST_FUNC
void gen_bounded_ptr_add(void)
1065 /* prepare fast i386 function call (args in eax and edx) */
1066 gv2(RC_EAX
, RC_EDX
);
1067 /* save all temporary registers */
1070 /* do a fast function call */
1071 sym
= external_global_sym(TOK___bound_ptr_add
, &func_old_type
, 0);
1072 greloc(cur_text_section
, sym
,
1073 ind
+ 1, R_386_PC32
);
1075 /* returned pointer is in eax */
1077 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1078 /* address of bounding function call point */
1079 vtop
->c
.ul
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1082 /* patch pointer addition in vtop so that pointer dereferencing is
1084 ST_FUNC
void gen_bounded_ptr_deref(void)
1092 /* XXX: put that code in generic part of tcc */
1093 if (!is_float(vtop
->type
.t
)) {
1094 if (vtop
->r
& VT_LVAL_BYTE
)
1096 else if (vtop
->r
& VT_LVAL_SHORT
)
1100 size
= type_size(&vtop
->type
, &align
);
1102 case 1: func
= TOK___bound_ptr_indir1
; break;
1103 case 2: func
= TOK___bound_ptr_indir2
; break;
1104 case 4: func
= TOK___bound_ptr_indir4
; break;
1105 case 8: func
= TOK___bound_ptr_indir8
; break;
1106 case 12: func
= TOK___bound_ptr_indir12
; break;
1107 case 16: func
= TOK___bound_ptr_indir16
; break;
1109 tcc_error("unhandled size when dereferencing bounded pointer");
1114 /* patch relocation */
1115 /* XXX: find a better solution ? */
1116 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.ul
);
1117 sym
= external_global_sym(func
, &func_old_type
, 0);
1119 put_extern_sym(sym
, NULL
, 0, 0);
1120 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1124 /* Save the stack pointer onto the stack */
1125 ST_FUNC
void gen_vla_sp_save(int addr
) {
1126 /* mov %esp,addr(%ebp)*/
1128 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1131 /* Restore the SP from a location on the stack */
1132 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1134 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1137 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1138 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1139 #ifdef TCC_TARGET_PE
1140 /* alloca does more than just adjust %rsp on Windows */
1141 vpush_global_sym(&func_old_type
, TOK_alloca
);
1142 vswap(); /* Move alloca ref past allocation size */
1144 vset(type
, REG_IRET
, 0);
1147 r
= gv(RC_INT
); /* allocation size */
1151 /* We align to 16 bytes rather than align */
1162 /* end of X86 code generator */
1163 /*************************************************************/
1165 /*************************************************************/