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 */
48 /* return registers for function */
49 #define REG_IRET TREG_EAX /* single word int return register */
50 #define REG_LRET TREG_EDX /* second word return register (for long long) */
51 #define REG_FRET TREG_ST0 /* float return register */
53 /* defined if function parameters must be evaluated in reverse order */
54 #define INVERT_FUNC_PARAMS
56 /* defined if structures are passed as pointers. Otherwise structures
57 are directly pushed on stack. */
58 //#define FUNC_STRUCT_PARAM_AS_PTR
60 /* pointer size, in bytes */
63 /* long double size and alignment, in bytes */
64 #define LDOUBLE_SIZE 12
65 #define LDOUBLE_ALIGN 4
66 /* maximum alignment (for aligned attribute support) */
72 /******************************************************/
75 #define EM_TCC_TARGET EM_386
77 /* relocation type for 32 bit data relocation */
78 #define R_DATA_32 R_386_32
79 #define R_DATA_PTR R_386_32
80 #define R_JMP_SLOT R_386_JMP_SLOT
81 #define R_COPY R_386_COPY
83 #define ELF_START_ADDR 0x08048000
84 #define ELF_PAGE_SIZE 0x1000
86 /******************************************************/
87 #else /* ! TARGET_DEFS_ONLY */
88 /******************************************************/
91 ST_DATA
const int reg_classes
[NB_REGS
] = {
92 /* eax */ RC_INT
| RC_EAX
,
93 /* ecx */ RC_INT
| RC_ECX
,
94 /* edx */ RC_INT
| RC_EDX
,
95 /* st0 */ RC_FLOAT
| RC_ST0
,
98 static unsigned long func_sub_sp_offset
;
99 static int func_ret_sub
;
100 #ifdef CONFIG_TCC_BCHECK
101 static unsigned long func_bound_offset
;
104 /* XXX: make it faster ? */
105 ST_FUNC
void g(int c
)
109 if (ind1
> cur_text_section
->data_allocated
)
110 section_realloc(cur_text_section
, ind1
);
111 cur_text_section
->data
[ind
] = c
;
115 ST_FUNC
void o(unsigned int c
)
123 ST_FUNC
void gen_le16(int v
)
129 ST_FUNC
void gen_le32(int c
)
137 /* output a symbol and patch all calls to it */
138 ST_FUNC
void gsym_addr(int t
, int a
)
142 ptr
= (int *)(cur_text_section
->data
+ t
);
143 n
= *ptr
; /* next value */
149 ST_FUNC
void gsym(int t
)
154 /* psym is used to put an instruction with a data field which is a
155 reference to a symbol. It is in fact the same as oad ! */
158 /* instruction + 4 bytes data. Return the address of the data */
159 ST_FUNC
int oad(int c
, int s
)
165 if (ind1
> cur_text_section
->data_allocated
)
166 section_realloc(cur_text_section
, ind1
);
167 *(int *)(cur_text_section
->data
+ ind
) = s
;
173 /* output constant with relocation if 'r & VT_SYM' is true */
174 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
177 greloc(cur_text_section
, sym
, ind
, R_386_32
);
181 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
184 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
188 /* generate a modrm reference. 'op_reg' contains the addtionnal 3
190 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
192 op_reg
= op_reg
<< 3;
193 if ((r
& VT_VALMASK
) == VT_CONST
) {
194 /* constant memory reference */
196 gen_addr32(r
, sym
, c
);
197 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
198 /* currently, we use only ebp as base */
200 /* short reference */
204 oad(0x85 | op_reg
, c
);
207 g(0x00 | op_reg
| (r
& VT_VALMASK
));
211 /* load 'r' from value 'sv' */
212 ST_FUNC
void load(int r
, SValue
*sv
)
214 int v
, t
, ft
, fc
, fr
;
219 sv
= pe_getimport(sv
, &v2
);
228 if (v
== VT_LLOCAL
) {
230 v1
.r
= VT_LOCAL
| VT_LVAL
;
233 if (!(reg_classes
[fr
] & RC_INT
))
234 fr
= get_reg(RC_INT
);
237 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
240 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
243 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
246 } else if ((ft
& VT_TYPE
) == VT_BYTE
) {
247 o(0xbe0f); /* movsbl */
248 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
249 o(0xb60f); /* movzbl */
250 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
251 o(0xbf0f); /* movswl */
252 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
253 o(0xb70f); /* movzwl */
257 gen_modrm(r
, fr
, sv
->sym
, fc
);
260 o(0xb8 + r
); /* mov $xx, r */
261 gen_addr32(fr
, sv
->sym
, fc
);
262 } else if (v
== VT_LOCAL
) {
264 o(0x8d); /* lea xxx(%ebp), r */
265 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
268 o(0xe8 + r
); /* mov %ebp, r */
270 } else if (v
== VT_CMP
) {
271 oad(0xb8 + r
, 0); /* mov $0, r */
272 o(0x0f); /* setxx %br */
275 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
277 oad(0xb8 + r
, t
); /* mov $1, r */
278 o(0x05eb); /* jmp after */
280 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
283 o(0xc0 + r
+ v
* 8); /* mov v, r */
288 /* store register 'r' in lvalue 'v' */
289 ST_FUNC
void store(int r
, SValue
*v
)
295 v
= pe_getimport(v
, &v2
);
300 fr
= v
->r
& VT_VALMASK
;
302 /* XXX: incorrect if float reg to reg */
303 if (bt
== VT_FLOAT
) {
306 } else if (bt
== VT_DOUBLE
) {
309 } else if (bt
== VT_LDOUBLE
) {
310 o(0xc0d9); /* fld %st(0) */
316 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
321 if (fr
== VT_CONST
||
324 gen_modrm(r
, v
->r
, v
->sym
, fc
);
325 } else if (fr
!= r
) {
326 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
330 static void gadd_sp(int val
)
332 if (val
== (char)val
) {
336 oad(0xc481, val
); /* add $xxx, %esp */
340 /* 'is_jmp' is '1' if it is a jump */
341 static void gcall_or_jmp(int is_jmp
)
344 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
346 if (vtop
->r
& VT_SYM
) {
347 /* relocation case */
348 greloc(cur_text_section
, vtop
->sym
,
349 ind
+ 1, R_386_PC32
);
351 /* put an empty PC32 relocation */
352 put_elf_reloc(symtab_section
, cur_text_section
,
353 ind
+ 1, R_386_PC32
, 0);
355 oad(0xe8 + is_jmp
, vtop
->c
.ul
- 4); /* call/jmp im */
357 /* otherwise, indirect call */
359 o(0xff); /* call/jmp *r */
360 o(0xd0 + r
+ (is_jmp
<< 4));
364 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
365 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
367 /* Generate function call. The function address is pushed first, then
368 all the parameters in call order. This functions pops all the
369 parameters and the function address. */
370 ST_FUNC
void gfunc_call(int nb_args
)
372 int size
, align
, r
, args_size
, i
, func_call
;
376 for(i
= 0;i
< nb_args
; i
++) {
377 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
378 size
= type_size(&vtop
->type
, &align
);
379 /* align to stack align size */
380 size
= (size
+ 3) & ~3;
381 /* allocate the necessary size on stack */
382 oad(0xec81, size
); /* sub $xxx, %esp */
383 /* generate structure store */
385 o(0x89); /* mov %esp, r */
387 vset(&vtop
->type
, r
| VT_LVAL
, 0);
391 } else if (is_float(vtop
->type
.t
)) {
392 gv(RC_FLOAT
); /* only one float register */
393 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
395 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
399 oad(0xec81, size
); /* sub $xxx, %esp */
403 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
408 /* simple type (currently always same size) */
409 /* XXX: implicit cast ? */
411 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
413 o(0x50 + vtop
->r2
); /* push r */
417 o(0x50 + r
); /* push r */
422 save_regs(0); /* save used temporary registers */
423 func_sym
= vtop
->type
.ref
;
424 func_call
= FUNC_CALL(func_sym
->r
);
426 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
427 func_call
== FUNC_FASTCALLW
) {
428 int fastcall_nb_regs
;
429 uint8_t *fastcall_regs_ptr
;
430 if (func_call
== FUNC_FASTCALLW
) {
431 fastcall_regs_ptr
= fastcallw_regs
;
432 fastcall_nb_regs
= 2;
434 fastcall_regs_ptr
= fastcall_regs
;
435 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
437 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
440 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
441 /* XXX: incorrect for struct/floats */
448 if ((func_sym
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
451 if (args_size
&& func_call
!= FUNC_STDCALL
)
457 #define FUNC_PROLOG_SIZE 10
459 #define FUNC_PROLOG_SIZE 9
462 /* generate function prolog of type 't' */
463 ST_FUNC
void gfunc_prolog(CType
*func_type
)
465 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
466 int param_index
, param_addr
;
467 uint8_t *fastcall_regs_ptr
;
471 sym
= func_type
->ref
;
472 func_call
= FUNC_CALL(sym
->r
);
477 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
478 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
479 fastcall_regs_ptr
= fastcall_regs
;
480 } else if (func_call
== FUNC_FASTCALLW
) {
481 fastcall_nb_regs
= 2;
482 fastcall_regs_ptr
= fastcallw_regs
;
484 fastcall_nb_regs
= 0;
485 fastcall_regs_ptr
= NULL
;
489 ind
+= FUNC_PROLOG_SIZE
;
490 func_sub_sp_offset
= ind
;
491 /* if the function returns a structure, then add an
492 implicit pointer parameter */
494 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
495 /* XXX: fastcall case ? */
500 /* define parameters */
501 while ((sym
= sym
->next
) != NULL
) {
503 size
= type_size(type
, &align
);
504 size
= (size
+ 3) & ~3;
505 #ifdef FUNC_STRUCT_PARAM_AS_PTR
506 /* structs are passed as pointer */
507 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
511 if (param_index
< fastcall_nb_regs
) {
512 /* save FASTCALL register */
515 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
521 sym_push(sym
->v
& ~SYM_FIELD
, type
,
522 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
526 /* pascal type call ? */
527 if (func_call
== FUNC_STDCALL
)
528 func_ret_sub
= addr
- 8;
534 #ifdef CONFIG_TCC_BCHECK
535 /* leave some room for bound checking code */
536 if (tcc_state
->do_bounds_check
) {
537 oad(0xb8, 0); /* lbound section pointer */
538 oad(0xb8, 0); /* call to function */
539 func_bound_offset
= lbounds_section
->data_offset
;
544 /* generate function epilog */
545 ST_FUNC
void gfunc_epilog(void)
549 #ifdef CONFIG_TCC_BCHECK
550 if (tcc_state
->do_bounds_check
551 && func_bound_offset
!= lbounds_section
->data_offset
) {
555 /* add end of table info */
556 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(int));
558 /* generate bound local allocation */
560 ind
= func_sub_sp_offset
;
561 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
562 func_bound_offset
, lbounds_section
->data_offset
);
563 greloc(cur_text_section
, sym_data
,
565 oad(0xb8, 0); /* mov %eax, xxx */
566 sym
= external_global_sym(TOK___bound_local_new
, &func_old_type
, 0);
567 greloc(cur_text_section
, sym
,
568 ind
+ 1, R_386_PC32
);
571 /* generate bound check local freeing */
572 o(0x5250); /* save returned value, if any */
573 greloc(cur_text_section
, sym_data
,
575 oad(0xb8, 0); /* mov %eax, xxx */
576 sym
= external_global_sym(TOK___bound_local_delete
, &func_old_type
, 0);
577 greloc(cur_text_section
, sym
,
578 ind
+ 1, R_386_PC32
);
580 o(0x585a); /* restore returned value, if any */
584 if (func_ret_sub
== 0) {
589 g(func_ret_sub
>> 8);
591 /* align local size to word & save local variables */
595 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
598 Sym
*sym
= external_global_sym(TOK___chkstk
, &func_old_type
, 0);
599 oad(0xb8, v
); /* mov stacksize, %eax */
600 oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
601 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
605 o(0xe58955); /* push %ebp, mov %esp, %ebp */
606 o(0xec81); /* sub esp, stacksize */
608 #if FUNC_PROLOG_SIZE == 10
609 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
615 /* generate a jump to a label */
616 ST_FUNC
int gjmp(int t
)
618 return psym(0xe9, t
);
621 /* generate a jump to a fixed address */
622 ST_FUNC
void gjmp_addr(int a
)
630 oad(0xe9, a
- ind
- 5);
634 /* generate a test. set 'inv' to invert test. Stack entry is popped */
635 ST_FUNC
int gtst(int inv
, int t
)
639 v
= vtop
->r
& VT_VALMASK
;
641 /* fast case : can jump directly since flags are set */
643 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
644 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
645 /* && or || optimization */
646 if ((v
& 1) == inv
) {
647 /* insert vtop->c jump list in t */
650 p
= (int *)(cur_text_section
->data
+ *p
);
658 if (is_float(vtop
->type
.t
) ||
659 (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
663 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
664 /* constant jmp optimization */
665 if ((vtop
->c
.i
!= 0) != inv
)
672 t
= psym(0x85 ^ inv
, t
);
679 /* generate an integer binary operation */
680 ST_FUNC
void gen_opi(int op
)
686 case TOK_ADDC1
: /* add with carry generation */
689 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
696 /* generate inc and dec for smaller code */
697 if (c
==1 && opc
==0) {
699 } else if (c
==1 && opc
==5) {
703 o(0xc0 | (opc
<< 3) | r
);
708 oad(0xc0 | (opc
<< 3) | r
, c
);
714 o((opc
<< 3) | 0x01);
715 o(0xc0 + r
+ fr
* 8);
718 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
724 case TOK_SUBC1
: /* sub with carry generation */
727 case TOK_ADDC2
: /* add with carry use */
730 case TOK_SUBC2
: /* sub with carry use */
747 o(0xaf0f); /* imul fr, r */
748 o(0xc0 + fr
+ r
* 8);
759 opc
= 0xc0 | (opc
<< 3);
760 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
765 c
= vtop
->c
.i
& 0x1f;
766 o(0xc1); /* shl/shr/sar $xxx, r */
770 /* we generate the shift in ecx */
773 o(0xd3); /* shl/shr/sar %cl, r */
784 /* first operand must be in eax */
785 /* XXX: need better constraint for second operand */
791 if (op
== TOK_UMULL
) {
792 o(0xf7); /* mul fr */
797 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
798 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
801 o(0xf799); /* cltd, idiv fr, %eax */
804 if (op
== '%' || op
== TOK_UMOD
)
817 /* generate a floating point operation 'v = t1 op t2' instruction. The
818 two operands are guaranted to have the same floating point type */
819 /* XXX: need to use ST1 too */
820 ST_FUNC
void gen_opf(int op
)
822 int a
, ft
, fc
, swapped
, r
;
824 /* convert constants to memory references */
825 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
830 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
833 /* must put at least one value in the floating point register */
834 if ((vtop
[-1].r
& VT_LVAL
) &&
835 (vtop
[0].r
& VT_LVAL
)) {
841 /* swap the stack if needed so that t1 is the register and t2 is
842 the memory reference */
843 if (vtop
[-1].r
& VT_LVAL
) {
847 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
848 /* load on stack second operand */
849 load(TREG_ST0
, vtop
);
850 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
851 if (op
== TOK_GE
|| op
== TOK_GT
)
853 else if (op
== TOK_EQ
|| op
== TOK_NE
)
856 o(0xc9d9); /* fxch %st(1) */
857 o(0xe9da); /* fucompp */
858 o(0xe0df); /* fnstsw %ax */
860 o(0x45e480); /* and $0x45, %ah */
861 o(0x40fC80); /* cmp $0x40, %ah */
862 } else if (op
== TOK_NE
) {
863 o(0x45e480); /* and $0x45, %ah */
864 o(0x40f480); /* xor $0x40, %ah */
866 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
867 o(0x05c4f6); /* test $0x05, %ah */
870 o(0x45c4f6); /* test $0x45, %ah */
877 /* no memory reference possible for long double operations */
878 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
879 load(TREG_ST0
, vtop
);
904 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
905 o(0xde); /* fxxxp %st, %st(1) */
908 /* if saved lvalue, then we must reload it */
910 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
914 v1
.r
= VT_LOCAL
| VT_LVAL
;
920 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
924 gen_modrm(a
, r
, vtop
->sym
, fc
);
930 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
931 and 'long long' cases. */
932 ST_FUNC
void gen_cvt_itof(int t
)
936 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
937 /* signed long long to float/double/long double (unsigned case
938 is handled generically) */
939 o(0x50 + vtop
->r2
); /* push r2 */
940 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
941 o(0x242cdf); /* fildll (%esp) */
942 o(0x08c483); /* add $8, %esp */
943 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
944 (VT_INT
| VT_UNSIGNED
)) {
945 /* unsigned int to float/double/long double */
946 o(0x6a); /* push $0 */
948 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
949 o(0x242cdf); /* fildll (%esp) */
950 o(0x08c483); /* add $8, %esp */
952 /* int to float/double/long double */
953 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
954 o(0x2404db); /* fildl (%esp) */
955 o(0x04c483); /* add $4, %esp */
960 /* convert fp to int 't' type */
961 /* XXX: handle long long case */
962 ST_FUNC
void gen_cvt_ftoi(int t
)
968 ushort_type
.t
= VT_SHORT
| VT_UNSIGNED
;
977 o(0x2dd9); /* ldcw xxx */
978 sym
= external_global_sym(TOK___tcc_int_fpu_control
,
979 &ushort_type
, VT_LVAL
);
980 greloc(cur_text_section
, sym
,
984 oad(0xec81, size
); /* sub $xxx, %esp */
986 o(0x1cdb); /* fistpl */
988 o(0x3cdf); /* fistpll */
990 o(0x2dd9); /* ldcw xxx */
991 sym
= external_global_sym(TOK___tcc_fpu_control
,
992 &ushort_type
, VT_LVAL
);
993 greloc(cur_text_section
, sym
,
998 o(0x58 + r
); /* pop r */
1000 if (t
== VT_LLONG
) {
1001 vtop
->r
= r
; /* mark reg as used */
1002 r2
= get_reg(RC_INT
);
1003 o(0x58 + r2
); /* pop r2 */
1006 o(0x04c483); /* add $4, %esp */
1012 /* convert from one floating point type to another */
1013 ST_FUNC
void gen_cvt_ftof(int t
)
1015 /* all we have to do on i386 is to put the float in a register */
1019 /* computed goto support */
1020 ST_FUNC
void ggoto(void)
1026 /* bound check support functions */
1027 #ifdef CONFIG_TCC_BCHECK
1029 /* generate a bounded pointer addition */
1030 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 sym
= external_global_sym(TOK___bound_ptr_add
, &func_old_type
, 0);
1041 greloc(cur_text_section
, sym
,
1042 ind
+ 1, R_386_PC32
);
1044 /* returned pointer is in eax */
1046 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1047 /* address of bounding function call point */
1048 vtop
->c
.ul
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1051 /* patch pointer addition in vtop so that pointer dereferencing is
1053 ST_FUNC
void gen_bounded_ptr_deref(void)
1061 /* XXX: put that code in generic part of tcc */
1062 if (!is_float(vtop
->type
.t
)) {
1063 if (vtop
->r
& VT_LVAL_BYTE
)
1065 else if (vtop
->r
& VT_LVAL_SHORT
)
1069 size
= type_size(&vtop
->type
, &align
);
1071 case 1: func
= TOK___bound_ptr_indir1
; break;
1072 case 2: func
= TOK___bound_ptr_indir2
; break;
1073 case 4: func
= TOK___bound_ptr_indir4
; break;
1074 case 8: func
= TOK___bound_ptr_indir8
; break;
1075 case 12: func
= TOK___bound_ptr_indir12
; break;
1076 case 16: func
= TOK___bound_ptr_indir16
; break;
1078 tcc_error("unhandled size when dereferencing bounded pointer");
1083 /* patch relocation */
1084 /* XXX: find a better solution ? */
1085 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.ul
);
1086 sym
= external_global_sym(func
, &func_old_type
, 0);
1088 put_extern_sym(sym
, NULL
, 0, 0);
1089 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1093 /* end of X86 code generator */
1094 /*************************************************************/
1096 /*************************************************************/