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 static void gen_static_call(int v
)
345 sym
= external_global_sym(v
, &func_old_type
, 0);
347 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
) {
356 if (vtop
->r
& VT_SYM
) {
357 /* relocation case */
358 greloc(cur_text_section
, vtop
->sym
,
359 ind
+ 1, R_386_PC32
);
361 /* put an empty PC32 relocation */
362 put_elf_reloc(symtab_section
, cur_text_section
,
363 ind
+ 1, R_386_PC32
, 0);
365 oad(0xe8 + is_jmp
, vtop
->c
.ul
- 4); /* call/jmp im */
367 /* otherwise, indirect call */
369 o(0xff); /* call/jmp *r */
370 o(0xd0 + r
+ (is_jmp
<< 4));
374 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
375 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
377 /* Return the number of registers needed to return the struct, or 0 if
378 returning via struct pointer. */
379 ST_FUNC
int gfunc_sret(CType
*vt
, CType
*ret
, int *ret_align
)
384 *ret_align
= 1; // Never have to re-align return values for x86
385 size
= type_size(vt
, &align
);
388 } else if (size
> 4) {
398 *ret_align
= 1; // Never have to re-align return values for x86
403 /* Generate function call. The function address is pushed first, then
404 all the parameters in call order. This functions pops all the
405 parameters and the function address. */
406 ST_FUNC
void gfunc_call(int nb_args
)
408 int size
, align
, r
, args_size
, i
, func_call
;
412 for(i
= 0;i
< nb_args
; i
++) {
413 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
414 size
= type_size(&vtop
->type
, &align
);
415 /* align to stack align size */
416 size
= (size
+ 3) & ~3;
417 /* allocate the necessary size on stack */
418 oad(0xec81, size
); /* sub $xxx, %esp */
419 /* generate structure store */
421 o(0x89); /* mov %esp, r */
423 vset(&vtop
->type
, r
| VT_LVAL
, 0);
427 } else if (is_float(vtop
->type
.t
)) {
428 gv(RC_FLOAT
); /* only one float register */
429 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
431 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
435 oad(0xec81, size
); /* sub $xxx, %esp */
439 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
444 /* simple type (currently always same size) */
445 /* XXX: implicit cast ? */
447 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
449 o(0x50 + vtop
->r2
); /* push r */
453 o(0x50 + r
); /* push r */
458 save_regs(0); /* save used temporary registers */
459 func_sym
= vtop
->type
.ref
;
460 func_call
= FUNC_CALL(func_sym
->r
);
462 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
463 func_call
== FUNC_FASTCALLW
) {
464 int fastcall_nb_regs
;
465 uint8_t *fastcall_regs_ptr
;
466 if (func_call
== FUNC_FASTCALLW
) {
467 fastcall_regs_ptr
= fastcallw_regs
;
468 fastcall_nb_regs
= 2;
470 fastcall_regs_ptr
= fastcall_regs
;
471 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
473 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
476 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
477 /* XXX: incorrect for struct/floats */
481 #ifndef TCC_TARGET_PE
482 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
487 if (args_size
&& func_call
!= FUNC_STDCALL
)
493 #define FUNC_PROLOG_SIZE 10
495 #define FUNC_PROLOG_SIZE 9
498 /* generate function prolog of type 't' */
499 ST_FUNC
void gfunc_prolog(CType
*func_type
)
501 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
502 int param_index
, param_addr
;
503 uint8_t *fastcall_regs_ptr
;
507 sym
= func_type
->ref
;
508 func_call
= FUNC_CALL(sym
->r
);
513 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
514 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
515 fastcall_regs_ptr
= fastcall_regs
;
516 } else if (func_call
== FUNC_FASTCALLW
) {
517 fastcall_nb_regs
= 2;
518 fastcall_regs_ptr
= fastcallw_regs
;
520 fastcall_nb_regs
= 0;
521 fastcall_regs_ptr
= NULL
;
525 ind
+= FUNC_PROLOG_SIZE
;
526 func_sub_sp_offset
= ind
;
527 /* if the function returns a structure, then add an
528 implicit pointer parameter */
531 size
= type_size(&func_vt
,&align
);
532 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) && (size
> 8)) {
534 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
536 /* XXX: fastcall case ? */
541 /* define parameters */
542 while ((sym
= sym
->next
) != NULL
) {
544 size
= type_size(type
, &align
);
545 size
= (size
+ 3) & ~3;
546 #ifdef FUNC_STRUCT_PARAM_AS_PTR
547 /* structs are passed as pointer */
548 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
552 if (param_index
< fastcall_nb_regs
) {
553 /* save FASTCALL register */
556 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
562 sym_push(sym
->v
& ~SYM_FIELD
, type
,
563 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
567 /* pascal type call ? */
568 if (func_call
== FUNC_STDCALL
)
569 func_ret_sub
= addr
- 8;
570 #ifndef TCC_TARGET_PE
575 #ifdef CONFIG_TCC_BCHECK
576 /* leave some room for bound checking code */
577 if (tcc_state
->do_bounds_check
) {
578 oad(0xb8, 0); /* lbound section pointer */
579 oad(0xb8, 0); /* call to function */
580 func_bound_offset
= lbounds_section
->data_offset
;
584 #ifndef TCC_TARGET_PE
585 if (0 == strcmp(funcname
, "main"))
586 gen_static_call(TOK___tcc_fpinit
);
591 /* generate function epilog */
592 ST_FUNC
void gfunc_epilog(void)
596 #ifdef CONFIG_TCC_BCHECK
597 if (tcc_state
->do_bounds_check
598 && func_bound_offset
!= lbounds_section
->data_offset
) {
602 /* add end of table info */
603 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(int));
605 /* generate bound local allocation */
607 ind
= func_sub_sp_offset
;
608 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
609 func_bound_offset
, lbounds_section
->data_offset
);
610 greloc(cur_text_section
, sym_data
,
612 oad(0xb8, 0); /* mov %eax, xxx */
613 gen_static_call(TOK___bound_local_new
);
616 /* generate bound check local freeing */
617 o(0x5250); /* save returned value, if any */
618 greloc(cur_text_section
, sym_data
,
620 oad(0xb8, 0); /* mov %eax, xxx */
621 gen_static_call(TOK___bound_local_delete
);
623 o(0x585a); /* restore returned value, if any */
627 if (func_ret_sub
== 0) {
632 g(func_ret_sub
>> 8);
634 /* align local size to word & save local variables */
638 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
641 oad(0xb8, v
); /* mov stacksize, %eax */
642 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
646 o(0xe58955); /* push %ebp, mov %esp, %ebp */
647 o(0xec81); /* sub esp, stacksize */
649 #if FUNC_PROLOG_SIZE == 10
650 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
656 /* generate a jump to a label */
657 ST_FUNC
int gjmp(int t
)
659 return psym(0xe9, t
);
662 /* generate a jump to a fixed address */
663 ST_FUNC
void gjmp_addr(int a
)
671 oad(0xe9, a
- ind
- 5);
675 /* generate a test. set 'inv' to invert test. Stack entry is popped */
676 ST_FUNC
int gtst(int inv
, int t
)
680 v
= vtop
->r
& VT_VALMASK
;
682 /* fast case : can jump directly since flags are set */
684 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
685 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
686 /* && or || optimization */
687 if ((v
& 1) == inv
) {
688 /* insert vtop->c jump list in t */
691 p
= (int *)(cur_text_section
->data
+ *p
);
699 if (is_float(vtop
->type
.t
) ||
700 (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
704 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
705 /* constant jmp optimization */
706 if ((vtop
->c
.i
!= 0) != inv
)
713 t
= psym(0x85 ^ inv
, t
);
720 /* generate an integer binary operation */
721 ST_FUNC
void gen_opi(int op
)
727 case TOK_ADDC1
: /* add with carry generation */
730 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
737 /* generate inc and dec for smaller code */
738 if (c
==1 && opc
==0) {
740 } else if (c
==1 && opc
==5) {
744 o(0xc0 | (opc
<< 3) | r
);
749 oad(0xc0 | (opc
<< 3) | r
, c
);
755 o((opc
<< 3) | 0x01);
756 o(0xc0 + r
+ fr
* 8);
759 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
765 case TOK_SUBC1
: /* sub with carry generation */
768 case TOK_ADDC2
: /* add with carry use */
771 case TOK_SUBC2
: /* sub with carry use */
788 o(0xaf0f); /* imul fr, r */
789 o(0xc0 + fr
+ r
* 8);
800 opc
= 0xc0 | (opc
<< 3);
801 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
806 c
= vtop
->c
.i
& 0x1f;
807 o(0xc1); /* shl/shr/sar $xxx, r */
811 /* we generate the shift in ecx */
814 o(0xd3); /* shl/shr/sar %cl, r */
825 /* first operand must be in eax */
826 /* XXX: need better constraint for second operand */
832 if (op
== TOK_UMULL
) {
833 o(0xf7); /* mul fr */
838 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
839 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
842 o(0xf799); /* cltd, idiv fr, %eax */
845 if (op
== '%' || op
== TOK_UMOD
)
858 /* generate a floating point operation 'v = t1 op t2' instruction. The
859 two operands are guaranted to have the same floating point type */
860 /* XXX: need to use ST1 too */
861 ST_FUNC
void gen_opf(int op
)
863 int a
, ft
, fc
, swapped
, r
;
865 /* convert constants to memory references */
866 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
871 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
874 /* must put at least one value in the floating point register */
875 if ((vtop
[-1].r
& VT_LVAL
) &&
876 (vtop
[0].r
& VT_LVAL
)) {
882 /* swap the stack if needed so that t1 is the register and t2 is
883 the memory reference */
884 if (vtop
[-1].r
& VT_LVAL
) {
888 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
889 /* load on stack second operand */
890 load(TREG_ST0
, vtop
);
891 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
892 if (op
== TOK_GE
|| op
== TOK_GT
)
894 else if (op
== TOK_EQ
|| op
== TOK_NE
)
897 o(0xc9d9); /* fxch %st(1) */
898 o(0xe9da); /* fucompp */
899 o(0xe0df); /* fnstsw %ax */
901 o(0x45e480); /* and $0x45, %ah */
902 o(0x40fC80); /* cmp $0x40, %ah */
903 } else if (op
== TOK_NE
) {
904 o(0x45e480); /* and $0x45, %ah */
905 o(0x40f480); /* xor $0x40, %ah */
907 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
908 o(0x05c4f6); /* test $0x05, %ah */
911 o(0x45c4f6); /* test $0x45, %ah */
918 /* no memory reference possible for long double operations */
919 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
920 load(TREG_ST0
, vtop
);
945 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
946 o(0xde); /* fxxxp %st, %st(1) */
949 /* if saved lvalue, then we must reload it */
951 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
955 v1
.r
= VT_LOCAL
| VT_LVAL
;
961 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
965 gen_modrm(a
, r
, vtop
->sym
, fc
);
971 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
972 and 'long long' cases. */
973 ST_FUNC
void gen_cvt_itof(int t
)
977 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
978 /* signed long long to float/double/long double (unsigned case
979 is handled generically) */
980 o(0x50 + vtop
->r2
); /* push r2 */
981 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
982 o(0x242cdf); /* fildll (%esp) */
983 o(0x08c483); /* add $8, %esp */
984 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
985 (VT_INT
| VT_UNSIGNED
)) {
986 /* unsigned int to float/double/long double */
987 o(0x6a); /* push $0 */
989 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
990 o(0x242cdf); /* fildll (%esp) */
991 o(0x08c483); /* add $8, %esp */
993 /* int to float/double/long double */
994 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
995 o(0x2404db); /* fildl (%esp) */
996 o(0x04c483); /* add $4, %esp */
1001 /* convert fp to int 't' type */
1002 /* XXX: handle long long case */
1003 ST_FUNC
void gen_cvt_ftoi(int t
)
1008 gen_static_call(TOK___tcc_cvt_ftol
);
1009 vtop
->r
= TREG_EAX
; /* mark reg as used */
1011 vtop
->r2
= TREG_EDX
;
1014 /* convert from one floating point type to another */
1015 ST_FUNC
void gen_cvt_ftof(int t
)
1017 /* all we have to do on i386 is to put the float in a register */
1021 /* computed goto support */
1022 ST_FUNC
void ggoto(void)
1028 /* bound check support functions */
1029 #ifdef CONFIG_TCC_BCHECK
1031 /* generate a bounded pointer addition */
1032 ST_FUNC
void gen_bounded_ptr_add(void)
1034 /* prepare fast i386 function call (args in eax and edx) */
1035 gv2(RC_EAX
, RC_EDX
);
1036 /* save all temporary registers */
1039 /* do a fast function call */
1040 gen_static_call(TOK___bound_ptr_add
);
1041 /* returned pointer is in eax */
1043 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1044 /* address of bounding function call point */
1045 vtop
->c
.ul
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1048 /* patch pointer addition in vtop so that pointer dereferencing is
1050 ST_FUNC
void gen_bounded_ptr_deref(void)
1058 /* XXX: put that code in generic part of tcc */
1059 if (!is_float(vtop
->type
.t
)) {
1060 if (vtop
->r
& VT_LVAL_BYTE
)
1062 else if (vtop
->r
& VT_LVAL_SHORT
)
1066 size
= type_size(&vtop
->type
, &align
);
1068 case 1: func
= TOK___bound_ptr_indir1
; break;
1069 case 2: func
= TOK___bound_ptr_indir2
; break;
1070 case 4: func
= TOK___bound_ptr_indir4
; break;
1071 case 8: func
= TOK___bound_ptr_indir8
; break;
1072 case 12: func
= TOK___bound_ptr_indir12
; break;
1073 case 16: func
= TOK___bound_ptr_indir16
; break;
1075 tcc_error("unhandled size when dereferencing bounded pointer");
1080 /* patch relocation */
1081 /* XXX: find a better solution ? */
1082 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.ul
);
1083 sym
= external_global_sym(func
, &func_old_type
, 0);
1085 put_extern_sym(sym
, NULL
, 0, 0);
1086 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1090 /* Save the stack pointer onto the stack */
1091 ST_FUNC
void gen_vla_sp_save(int addr
) {
1092 /* mov %esp,addr(%ebp)*/
1094 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1097 /* Restore the SP from a location on the stack */
1098 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1100 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1103 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1104 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1105 #ifdef TCC_TARGET_PE
1106 /* alloca does more than just adjust %rsp on Windows */
1107 vpush_global_sym(&func_old_type
, TOK_alloca
);
1108 vswap(); /* Move alloca ref past allocation size */
1110 vset(type
, REG_IRET
, 0);
1113 r
= gv(RC_INT
); /* allocation size */
1117 /* We align to 16 bytes rather than align */
1128 /* end of X86 code generator */
1129 /*************************************************************/
1131 /*************************************************************/