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
;
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
) {
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
) {
261 o(0x8d); /* lea xxx(%ebp), r */
262 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
263 } else if (v
== VT_CMP
) {
264 oad(0xb8 + r
, 0); /* mov $0, r */
265 o(0x0f); /* setxx %br */
268 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
270 oad(0xb8 + r
, t
); /* mov $1, r */
271 o(0x05eb); /* jmp after */
273 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
276 o(0xc0 + r
+ v
* 8); /* mov v, r */
281 /* store register 'r' in lvalue 'v' */
282 ST_FUNC
void store(int r
, SValue
*v
)
288 v
= pe_getimport(v
, &v2
);
293 fr
= v
->r
& VT_VALMASK
;
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 /* 'is_jmp' is '1' if it is a jump */
334 static void gcall_or_jmp(int is_jmp
)
337 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
339 if (vtop
->r
& VT_SYM
) {
340 /* relocation case */
341 greloc(cur_text_section
, vtop
->sym
,
342 ind
+ 1, R_386_PC32
);
344 /* put an empty PC32 relocation */
345 put_elf_reloc(symtab_section
, cur_text_section
,
346 ind
+ 1, R_386_PC32
, 0);
348 oad(0xe8 + is_jmp
, vtop
->c
.ul
- 4); /* call/jmp im */
350 /* otherwise, indirect call */
352 o(0xff); /* call/jmp *r */
353 o(0xd0 + r
+ (is_jmp
<< 4));
357 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
358 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
360 /* Generate function call. The function address is pushed first, then
361 all the parameters in call order. This functions pops all the
362 parameters and the function address. */
363 ST_FUNC
void gfunc_call(int nb_args
)
365 int size
, align
, r
, args_size
, i
, func_call
;
369 for(i
= 0;i
< nb_args
; i
++) {
370 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
371 size
= type_size(&vtop
->type
, &align
);
372 /* align to stack align size */
373 size
= (size
+ 3) & ~3;
374 /* allocate the necessary size on stack */
375 oad(0xec81, size
); /* sub $xxx, %esp */
376 /* generate structure store */
378 o(0x89); /* mov %esp, r */
380 vset(&vtop
->type
, r
| VT_LVAL
, 0);
384 } else if (is_float(vtop
->type
.t
)) {
385 gv(RC_FLOAT
); /* only one float register */
386 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
388 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
392 oad(0xec81, size
); /* sub $xxx, %esp */
396 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
401 /* simple type (currently always same size) */
402 /* XXX: implicit cast ? */
404 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
406 o(0x50 + vtop
->r2
); /* push r */
410 o(0x50 + r
); /* push r */
415 save_regs(0); /* save used temporary registers */
416 func_sym
= vtop
->type
.ref
;
417 func_call
= FUNC_CALL(func_sym
->r
);
419 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
420 func_call
== FUNC_FASTCALLW
) {
421 int fastcall_nb_regs
;
422 uint8_t *fastcall_regs_ptr
;
423 if (func_call
== FUNC_FASTCALLW
) {
424 fastcall_regs_ptr
= fastcallw_regs
;
425 fastcall_nb_regs
= 2;
427 fastcall_regs_ptr
= fastcall_regs
;
428 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
430 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
433 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
434 /* XXX: incorrect for struct/floats */
441 if ((func_sym
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
444 if (args_size
&& func_call
!= FUNC_STDCALL
)
450 #define FUNC_PROLOG_SIZE 10
452 #define FUNC_PROLOG_SIZE 9
455 /* generate function prolog of type 't' */
456 ST_FUNC
void gfunc_prolog(CType
*func_type
)
458 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
459 int param_index
, param_addr
;
460 uint8_t *fastcall_regs_ptr
;
464 sym
= func_type
->ref
;
465 func_call
= FUNC_CALL(sym
->r
);
470 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
471 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
472 fastcall_regs_ptr
= fastcall_regs
;
473 } else if (func_call
== FUNC_FASTCALLW
) {
474 fastcall_nb_regs
= 2;
475 fastcall_regs_ptr
= fastcallw_regs
;
477 fastcall_nb_regs
= 0;
478 fastcall_regs_ptr
= NULL
;
482 ind
+= FUNC_PROLOG_SIZE
;
483 func_sub_sp_offset
= ind
;
484 /* if the function returns a structure, then add an
485 implicit pointer parameter */
487 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
488 /* XXX: fastcall case ? */
493 /* define parameters */
494 while ((sym
= sym
->next
) != NULL
) {
496 size
= type_size(type
, &align
);
497 size
= (size
+ 3) & ~3;
498 #ifdef FUNC_STRUCT_PARAM_AS_PTR
499 /* structs are passed as pointer */
500 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
504 if (param_index
< fastcall_nb_regs
) {
505 /* save FASTCALL register */
508 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
514 sym_push(sym
->v
& ~SYM_FIELD
, type
,
515 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
519 /* pascal type call ? */
520 if (func_call
== FUNC_STDCALL
)
521 func_ret_sub
= addr
- 8;
527 #ifdef CONFIG_TCC_BCHECK
528 /* leave some room for bound checking code */
529 if (tcc_state
->do_bounds_check
) {
530 oad(0xb8, 0); /* lbound section pointer */
531 oad(0xb8, 0); /* call to function */
532 func_bound_offset
= lbounds_section
->data_offset
;
537 /* generate function epilog */
538 ST_FUNC
void gfunc_epilog(void)
542 #ifdef CONFIG_TCC_BCHECK
543 if (tcc_state
->do_bounds_check
544 && func_bound_offset
!= lbounds_section
->data_offset
) {
548 /* add end of table info */
549 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(int));
551 /* generate bound local allocation */
553 ind
= func_sub_sp_offset
;
554 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
555 func_bound_offset
, lbounds_section
->data_offset
);
556 greloc(cur_text_section
, sym_data
,
558 oad(0xb8, 0); /* mov %eax, xxx */
559 sym
= external_global_sym(TOK___bound_local_new
, &func_old_type
, 0);
560 greloc(cur_text_section
, sym
,
561 ind
+ 1, R_386_PC32
);
564 /* generate bound check local freeing */
565 o(0x5250); /* save returned value, if any */
566 greloc(cur_text_section
, sym_data
,
568 oad(0xb8, 0); /* mov %eax, xxx */
569 sym
= external_global_sym(TOK___bound_local_delete
, &func_old_type
, 0);
570 greloc(cur_text_section
, sym
,
571 ind
+ 1, R_386_PC32
);
573 o(0x585a); /* restore returned value, if any */
577 if (func_ret_sub
== 0) {
582 g(func_ret_sub
>> 8);
584 /* align local size to word & save local variables */
588 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
591 Sym
*sym
= external_global_sym(TOK___chkstk
, &func_old_type
, 0);
592 oad(0xb8, v
); /* mov stacksize, %eax */
593 oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
594 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
598 o(0xe58955); /* push %ebp, mov %esp, %ebp */
599 o(0xec81); /* sub esp, stacksize */
601 #if FUNC_PROLOG_SIZE == 10
602 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
608 /* generate a jump to a label */
609 ST_FUNC
int gjmp(int t
)
611 return psym(0xe9, t
);
614 /* generate a jump to a fixed address */
615 ST_FUNC
void gjmp_addr(int a
)
623 oad(0xe9, a
- ind
- 5);
627 /* generate a test. set 'inv' to invert test. Stack entry is popped */
628 ST_FUNC
int gtst(int inv
, int t
)
632 v
= vtop
->r
& VT_VALMASK
;
634 /* fast case : can jump directly since flags are set */
636 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
637 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
638 /* && or || optimization */
639 if ((v
& 1) == inv
) {
640 /* insert vtop->c jump list in t */
643 p
= (int *)(cur_text_section
->data
+ *p
);
651 if (is_float(vtop
->type
.t
) ||
652 (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
656 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
657 /* constant jmp optimization */
658 if ((vtop
->c
.i
!= 0) != inv
)
665 t
= psym(0x85 ^ inv
, t
);
672 /* generate an integer binary operation */
673 ST_FUNC
void gen_opi(int op
)
679 case TOK_ADDC1
: /* add with carry generation */
682 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
689 /* XXX: generate inc and dec for smaller code ? */
691 o(0xc0 | (opc
<< 3) | r
);
695 oad(0xc0 | (opc
<< 3) | r
, c
);
701 o((opc
<< 3) | 0x01);
702 o(0xc0 + r
+ fr
* 8);
705 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
711 case TOK_SUBC1
: /* sub with carry generation */
714 case TOK_ADDC2
: /* add with carry use */
717 case TOK_SUBC2
: /* sub with carry use */
734 o(0xaf0f); /* imul fr, r */
735 o(0xc0 + fr
+ r
* 8);
746 opc
= 0xc0 | (opc
<< 3);
747 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
752 c
= vtop
->c
.i
& 0x1f;
753 o(0xc1); /* shl/shr/sar $xxx, r */
757 /* we generate the shift in ecx */
760 o(0xd3); /* shl/shr/sar %cl, r */
771 /* first operand must be in eax */
772 /* XXX: need better constraint for second operand */
778 if (op
== TOK_UMULL
) {
779 o(0xf7); /* mul fr */
784 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
785 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
788 o(0xf799); /* cltd, idiv fr, %eax */
791 if (op
== '%' || op
== TOK_UMOD
)
804 /* generate a floating point operation 'v = t1 op t2' instruction. The
805 two operands are guaranted to have the same floating point type */
806 /* XXX: need to use ST1 too */
807 ST_FUNC
void gen_opf(int op
)
809 int a
, ft
, fc
, swapped
, r
;
811 /* convert constants to memory references */
812 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
817 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
820 /* must put at least one value in the floating point register */
821 if ((vtop
[-1].r
& VT_LVAL
) &&
822 (vtop
[0].r
& VT_LVAL
)) {
828 /* swap the stack if needed so that t1 is the register and t2 is
829 the memory reference */
830 if (vtop
[-1].r
& VT_LVAL
) {
834 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
835 /* load on stack second operand */
836 load(TREG_ST0
, vtop
);
837 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
838 if (op
== TOK_GE
|| op
== TOK_GT
)
840 else if (op
== TOK_EQ
|| op
== TOK_NE
)
843 o(0xc9d9); /* fxch %st(1) */
844 o(0xe9da); /* fucompp */
845 o(0xe0df); /* fnstsw %ax */
847 o(0x45e480); /* and $0x45, %ah */
848 o(0x40fC80); /* cmp $0x40, %ah */
849 } else if (op
== TOK_NE
) {
850 o(0x45e480); /* and $0x45, %ah */
851 o(0x40f480); /* xor $0x40, %ah */
853 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
854 o(0x05c4f6); /* test $0x05, %ah */
857 o(0x45c4f6); /* test $0x45, %ah */
864 /* no memory reference possible for long double operations */
865 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
866 load(TREG_ST0
, vtop
);
891 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
892 o(0xde); /* fxxxp %st, %st(1) */
895 /* if saved lvalue, then we must reload it */
897 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
901 v1
.r
= VT_LOCAL
| VT_LVAL
;
907 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
911 gen_modrm(a
, r
, vtop
->sym
, fc
);
917 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
918 and 'long long' cases. */
919 ST_FUNC
void gen_cvt_itof(int t
)
923 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
924 /* signed long long to float/double/long double (unsigned case
925 is handled generically) */
926 o(0x50 + vtop
->r2
); /* push r2 */
927 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
928 o(0x242cdf); /* fildll (%esp) */
929 o(0x08c483); /* add $8, %esp */
930 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
931 (VT_INT
| VT_UNSIGNED
)) {
932 /* unsigned int to float/double/long double */
933 o(0x6a); /* push $0 */
935 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
936 o(0x242cdf); /* fildll (%esp) */
937 o(0x08c483); /* add $8, %esp */
939 /* int to float/double/long double */
940 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
941 o(0x2404db); /* fildl (%esp) */
942 o(0x04c483); /* add $4, %esp */
947 /* convert fp to int 't' type */
948 /* XXX: handle long long case */
949 ST_FUNC
void gen_cvt_ftoi(int t
)
955 ushort_type
.t
= VT_SHORT
| VT_UNSIGNED
;
964 o(0x2dd9); /* ldcw xxx */
965 sym
= external_global_sym(TOK___tcc_int_fpu_control
,
966 &ushort_type
, VT_LVAL
);
967 greloc(cur_text_section
, sym
,
971 oad(0xec81, size
); /* sub $xxx, %esp */
973 o(0x1cdb); /* fistpl */
975 o(0x3cdf); /* fistpll */
977 o(0x2dd9); /* ldcw xxx */
978 sym
= external_global_sym(TOK___tcc_fpu_control
,
979 &ushort_type
, VT_LVAL
);
980 greloc(cur_text_section
, sym
,
985 o(0x58 + r
); /* pop r */
988 vtop
->r
= r
; /* mark reg as used */
989 r2
= get_reg(RC_INT
);
990 o(0x58 + r2
); /* pop r2 */
993 o(0x04c483); /* add $4, %esp */
999 /* convert from one floating point type to another */
1000 ST_FUNC
void gen_cvt_ftof(int t
)
1002 /* all we have to do on i386 is to put the float in a register */
1006 /* computed goto support */
1007 ST_FUNC
void ggoto(void)
1013 /* bound check support functions */
1014 #ifdef CONFIG_TCC_BCHECK
1016 /* generate a bounded pointer addition */
1017 ST_FUNC
void gen_bounded_ptr_add(void)
1021 /* prepare fast i386 function call (args in eax and edx) */
1022 gv2(RC_EAX
, RC_EDX
);
1023 /* save all temporary registers */
1026 /* do a fast function call */
1027 sym
= external_global_sym(TOK___bound_ptr_add
, &func_old_type
, 0);
1028 greloc(cur_text_section
, sym
,
1029 ind
+ 1, R_386_PC32
);
1031 /* returned pointer is in eax */
1033 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1034 /* address of bounding function call point */
1035 vtop
->c
.ul
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1038 /* patch pointer addition in vtop so that pointer dereferencing is
1040 ST_FUNC
void gen_bounded_ptr_deref(void)
1048 /* XXX: put that code in generic part of tcc */
1049 if (!is_float(vtop
->type
.t
)) {
1050 if (vtop
->r
& VT_LVAL_BYTE
)
1052 else if (vtop
->r
& VT_LVAL_SHORT
)
1056 size
= type_size(&vtop
->type
, &align
);
1058 case 1: func
= TOK___bound_ptr_indir1
; break;
1059 case 2: func
= TOK___bound_ptr_indir2
; break;
1060 case 4: func
= TOK___bound_ptr_indir4
; break;
1061 case 8: func
= TOK___bound_ptr_indir8
; break;
1062 case 12: func
= TOK___bound_ptr_indir12
; break;
1063 case 16: func
= TOK___bound_ptr_indir16
; break;
1065 error("unhandled size when derefencing bounded pointer");
1070 /* patch relocation */
1071 /* XXX: find a better solution ? */
1072 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.ul
);
1073 sym
= external_global_sym(func
, &func_old_type
, 0);
1075 put_extern_sym(sym
, NULL
, 0, 0);
1076 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1080 /* end of X86 code generator */
1081 /*************************************************************/
1083 /*************************************************************/