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_IRE2 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_IRE2 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 /* define if return values need to be extended explicitely
75 at caller side (for interfacing with non-TCC compilers) */
78 /******************************************************/
79 #else /* ! TARGET_DEFS_ONLY */
80 /******************************************************/
84 /* define to 1/0 to [not] have EBX as 4th register */
87 ST_DATA
const int reg_classes
[NB_REGS
] = {
88 /* eax */ RC_INT
| RC_EAX
,
89 /* ecx */ RC_INT
| RC_ECX
,
90 /* edx */ RC_INT
| RC_EDX
,
91 /* ebx */ (RC_INT
| RC_EBX
) * USE_EBX
,
92 /* st0 */ RC_FLOAT
| RC_ST0
,
95 static unsigned long func_sub_sp_offset
;
96 static int func_ret_sub
;
97 #ifdef CONFIG_TCC_BCHECK
98 static addr_t func_bound_offset
;
99 static unsigned long func_bound_ind
;
100 static void gen_bounds_prolog(void);
101 static void gen_bounds_epilog(void);
104 /* XXX: make it faster ? */
105 ST_FUNC
void g(int c
)
111 if (ind1
> cur_text_section
->data_allocated
)
112 section_realloc(cur_text_section
, ind1
);
113 cur_text_section
->data
[ind
] = c
;
117 ST_FUNC
void o(unsigned int c
)
125 ST_FUNC
void gen_le16(int v
)
131 ST_FUNC
void gen_le32(int c
)
139 /* output a symbol and patch all calls to it */
140 ST_FUNC
void gsym_addr(int t
, int a
)
143 unsigned char *ptr
= cur_text_section
->data
+ t
;
144 uint32_t n
= read32le(ptr
); /* next value */
145 write32le(ptr
, a
- t
- 4);
150 /* instruction + 4 bytes data. Return the address of the data */
151 static int oad(int c
, int s
)
162 ST_FUNC
void gen_fill_nops(int bytes
)
168 /* generate jmp to a label */
169 #define gjmp2(instr,lbl) oad(instr,lbl)
171 /* output constant with relocation if 'r & VT_SYM' is true */
172 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
175 greloc(cur_text_section
, sym
, ind
, R_386_32
);
179 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
182 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
186 /* generate a modrm reference. 'op_reg' contains the additional 3
188 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
190 op_reg
= op_reg
<< 3;
191 if ((r
& VT_VALMASK
) == VT_CONST
) {
192 /* constant memory reference */
194 gen_addr32(r
, sym
, c
);
195 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
196 /* currently, we use only ebp as base */
198 /* short reference */
202 oad(0x85 | op_reg
, c
);
205 g(0x00 | op_reg
| (r
& VT_VALMASK
));
209 /* load 'r' from value 'sv' */
210 ST_FUNC
void load(int r
, SValue
*sv
)
212 int v
, t
, ft
, fc
, fr
;
217 sv
= pe_getimport(sv
, &v2
);
221 ft
= sv
->type
.t
& ~VT_DEFSIGN
;
224 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
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
|| (ft
& VT_TYPE
) == VT_BOOL
) {
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 o(0x0f); /* setxx %br */
274 o(0xc0b60f + r
* 0x90000); /* movzbl %al, %eax */
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
;
301 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
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 #if defined CONFIG_TCC_BCHECK || defined TCC_TARGET_PE
342 static void gen_static_call(int v
)
346 sym
= external_global_sym(v
, &func_old_type
);
348 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
352 /* 'is_jmp' is '1' if it is a jump */
353 static void gcall_or_jmp(int is_jmp
)
356 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&& (vtop
->r
& VT_SYM
)) {
357 /* constant and relocation case */
358 greloc(cur_text_section
, vtop
->sym
, ind
+ 1, R_386_PC32
);
359 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
361 /* otherwise, indirect call */
363 o(0xff); /* call/jmp *r */
364 o(0xd0 + r
+ (is_jmp
<< 4));
368 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
369 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
371 /* Return the number of registers needed to return the struct, or 0 if
372 returning via struct pointer. */
373 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
377 *ret_align
= 1; // Never have to re-align return values for x86
379 size
= type_size(vt
, &align
);
380 if (size
> 8 || (size
& (size
- 1)))
393 *ret_align
= 1; // Never have to re-align return values for x86
398 /* Generate function call. The function address is pushed first, then
399 all the parameters in call order. This functions pops all the
400 parameters and the function address. */
401 ST_FUNC
void gfunc_call(int nb_args
)
403 int size
, align
, r
, args_size
, i
, func_call
;
406 #ifdef CONFIG_TCC_BCHECK
407 if (tcc_state
->do_bounds_check
)
408 gbound_args(nb_args
);
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_sym
->f
.func_call
;
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
)
488 if (args_size
&& func_call
!= FUNC_STDCALL
&& func_call
!= FUNC_FASTCALLW
)
494 #define FUNC_PROLOG_SIZE (10 + USE_EBX)
496 #define FUNC_PROLOG_SIZE (9 + USE_EBX)
499 /* generate function prolog of type 't' */
500 ST_FUNC
void gfunc_prolog(Sym
*func_sym
)
502 CType
*func_type
= &func_sym
->type
;
503 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
504 int param_index
, param_addr
;
505 uint8_t *fastcall_regs_ptr
;
509 sym
= func_type
->ref
;
510 func_call
= sym
->f
.func_call
;
515 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
516 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
517 fastcall_regs_ptr
= fastcall_regs
;
518 } else if (func_call
== FUNC_FASTCALLW
) {
519 fastcall_nb_regs
= 2;
520 fastcall_regs_ptr
= fastcallw_regs
;
522 fastcall_nb_regs
= 0;
523 fastcall_regs_ptr
= NULL
;
527 ind
+= FUNC_PROLOG_SIZE
;
528 func_sub_sp_offset
= ind
;
529 /* if the function returns a structure, then add an
530 implicit pointer parameter */
532 func_var
= (sym
->f
.func_type
== FUNC_ELLIPSIS
);
534 size
= type_size(&func_vt
,&align
);
535 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
)
536 && (size
> 8 || (size
& (size
- 1)))) {
538 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
540 /* XXX: fastcall case ? */
545 /* define parameters */
546 while ((sym
= sym
->next
) != NULL
) {
548 size
= type_size(type
, &align
);
549 size
= (size
+ 3) & ~3;
550 #ifdef FUNC_STRUCT_PARAM_AS_PTR
551 /* structs are passed as pointer */
552 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
556 if (param_index
< fastcall_nb_regs
) {
557 /* save FASTCALL register */
560 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
566 sym_push(sym
->v
& ~SYM_FIELD
, type
,
567 VT_LOCAL
| VT_LVAL
, param_addr
);
571 /* pascal type call or fastcall ? */
572 if (func_call
== FUNC_STDCALL
|| func_call
== FUNC_FASTCALLW
)
573 func_ret_sub
= addr
- 8;
574 #ifndef TCC_TARGET_PE
579 #ifdef CONFIG_TCC_BCHECK
580 if (tcc_state
->do_bounds_check
)
585 /* generate function epilog */
586 ST_FUNC
void gfunc_epilog(void)
590 #ifdef CONFIG_TCC_BCHECK
591 if (tcc_state
->do_bounds_check
&&
592 (func_bound_offset
!= lbounds_section
->data_offset
||
593 tcc_state
->alloca_vla_used
))
597 /* align local size to word & save local variables */
602 gen_modrm(TREG_EBX
, VT_LOCAL
, NULL
, -(v
+4));
606 if (func_ret_sub
== 0) {
611 g(func_ret_sub
>> 8);
614 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
617 oad(0xb8, v
); /* mov stacksize, %eax */
618 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
622 o(0xe58955); /* push %ebp, mov %esp, %ebp */
623 o(0xec81); /* sub esp, stacksize */
626 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
629 o(0x53 * USE_EBX
); /* push ebx */
633 /* generate a jump to a label */
634 ST_FUNC
int gjmp(int t
)
636 return gjmp2(0xe9, t
);
639 /* generate a jump to a fixed address */
640 ST_FUNC
void gjmp_addr(int a
)
648 oad(0xe9, a
- ind
- 5);
653 /* generate a jump to a fixed address */
654 ST_FUNC
void gjmp_cond_addr(int a
, int op
)
660 g(0x0f), gjmp2(op
- 16, r
- 4);
664 ST_FUNC
int gjmp_append(int n
, int t
)
667 /* insert vtop->c jump list in t */
670 while ((n2
= read32le(p
= cur_text_section
->data
+ n1
)))
678 ST_FUNC
int gjmp_cond(int op
, int t
)
681 t
= gjmp2(op
- 16, t
);
685 ST_FUNC
void gen_opi(int op
)
691 case TOK_ADDC1
: /* add with carry generation */
694 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
701 /* generate inc and dec for smaller code */
702 if ((c
== 1 || c
== -1) && (op
== '+' || op
== '-')) {
703 opc
= (c
== 1) ^ (op
== '+');
704 o (0x40 | (opc
<< 3) | r
); // inc,dec
707 o(0xc0 | (opc
<< 3) | r
);
712 oad(0xc0 | (opc
<< 3) | r
, c
);
718 o((opc
<< 3) | 0x01);
719 o(0xc0 + r
+ fr
* 8);
722 if (op
>= TOK_ULT
&& op
<= TOK_GT
)
726 case TOK_SUBC1
: /* sub with carry generation */
729 case TOK_ADDC2
: /* add with carry use */
732 case TOK_SUBC2
: /* sub with carry use */
749 o(0xaf0f); /* imul fr, r */
750 o(0xc0 + fr
+ r
* 8);
761 opc
= 0xc0 | (opc
<< 3);
762 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
767 c
= vtop
->c
.i
& 0x1f;
768 o(0xc1); /* shl/shr/sar $xxx, r */
772 /* we generate the shift in ecx */
775 o(0xd3); /* shl/shr/sar %cl, r */
786 /* first operand must be in eax */
787 /* XXX: need better constraint for second operand */
793 /* save EAX too if used otherwise */
794 save_reg_upstack(TREG_EAX
, 1);
795 if (op
== TOK_UMULL
) {
796 o(0xf7); /* mul fr */
801 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
802 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
805 o(0xf799); /* cltd, idiv fr, %eax */
808 if (op
== '%' || op
== TOK_UMOD
)
821 /* generate a floating point operation 'v = t1 op t2' instruction. The
822 two operands are guaranteed to have the same floating point type */
823 /* XXX: need to use ST1 too */
824 ST_FUNC
void gen_opf(int op
)
826 int a
, ft
, fc
, swapped
, r
;
828 /* convert constants to memory references */
829 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
834 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
837 /* must put at least one value in the floating point register */
838 if ((vtop
[-1].r
& VT_LVAL
) &&
839 (vtop
[0].r
& VT_LVAL
)) {
845 /* swap the stack if needed so that t1 is the register and t2 is
846 the memory reference */
847 if (vtop
[-1].r
& VT_LVAL
) {
851 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
852 /* load on stack second operand */
853 load(TREG_ST0
, vtop
);
854 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
855 if (op
== TOK_GE
|| op
== TOK_GT
)
857 else if (op
== TOK_EQ
|| op
== TOK_NE
)
860 o(0xc9d9); /* fxch %st(1) */
861 if (op
== TOK_EQ
|| op
== TOK_NE
)
862 o(0xe9da); /* fucompp */
864 o(0xd9de); /* fcompp */
865 o(0xe0df); /* fnstsw %ax */
867 o(0x45e480); /* and $0x45, %ah */
868 o(0x40fC80); /* cmp $0x40, %ah */
869 } else if (op
== TOK_NE
) {
870 o(0x45e480); /* and $0x45, %ah */
871 o(0x40f480); /* xor $0x40, %ah */
873 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
874 o(0x05c4f6); /* test $0x05, %ah */
877 o(0x45c4f6); /* test $0x45, %ah */
883 /* no memory reference possible for long double operations */
884 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
885 load(TREG_ST0
, vtop
);
910 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
911 o(0xde); /* fxxxp %st, %st(1) */
914 /* if saved lvalue, then we must reload it */
916 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
920 v1
.r
= VT_LOCAL
| VT_LVAL
;
926 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
930 gen_modrm(a
, r
, vtop
->sym
, fc
);
936 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
937 and 'long long' cases. */
938 ST_FUNC
void gen_cvt_itof(int t
)
942 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
943 /* signed long long to float/double/long double (unsigned case
944 is handled generically) */
945 o(0x50 + vtop
->r2
); /* push r2 */
946 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
947 o(0x242cdf); /* fildll (%esp) */
948 o(0x08c483); /* add $8, %esp */
950 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
951 (VT_INT
| VT_UNSIGNED
)) {
952 /* unsigned int to float/double/long double */
953 o(0x6a); /* push $0 */
955 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
956 o(0x242cdf); /* fildll (%esp) */
957 o(0x08c483); /* add $8, %esp */
959 /* int to float/double/long double */
960 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
961 o(0x2404db); /* fildl (%esp) */
962 o(0x04c483); /* add $4, %esp */
968 /* convert fp to int 't' type */
969 ST_FUNC
void gen_cvt_ftoi(int t
)
971 int bt
= vtop
->type
.t
& VT_BTYPE
;
973 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
974 else if (bt
== VT_LDOUBLE
)
975 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
977 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
982 if ((t
& VT_BTYPE
) == VT_LLONG
)
986 /* convert from one floating point type to another */
987 ST_FUNC
void gen_cvt_ftof(int t
)
989 /* all we have to do on i386 is to put the float in a register */
993 /* char/short to int conversion */
994 ST_FUNC
void gen_cvt_csti(int t
)
998 sz
= !(t
& VT_UNSIGNED
);
999 xl
= (t
& VT_BTYPE
) == VT_SHORT
;
1000 o(0xc0b60f /* mov[sz] %a[xl], %eax */
1001 | (sz
<< 3 | xl
) << 8
1002 | (r
<< 3 | r
) << 16
1006 /* computed goto support */
1007 ST_FUNC
void ggoto(void)
1013 /* bound check support functions */
1014 #ifdef CONFIG_TCC_BCHECK
1015 /* generate a bounded pointer addition */
1016 ST_FUNC
void gen_bounded_ptr_add(void)
1018 vpush_global_sym(&func_old_type
, TOK___bound_ptr_add
);
1022 /* returned pointer is in eax */
1023 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1026 /* relocation offset of the bounding function call point */
1027 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1030 /* patch pointer addition in vtop so that pointer dereferencing is
1032 ST_FUNC
void gen_bounded_ptr_deref(void)
1042 size
= type_size(&vtop
->type
, &align
);
1044 case 1: func
= TOK___bound_ptr_indir1
; break;
1045 case 2: func
= TOK___bound_ptr_indir2
; break;
1046 case 4: func
= TOK___bound_ptr_indir4
; break;
1047 case 8: func
= TOK___bound_ptr_indir8
; break;
1048 case 12: func
= TOK___bound_ptr_indir12
; break;
1049 case 16: func
= TOK___bound_ptr_indir16
; break;
1051 /* may happen with struct member access */
1053 //tcc_error("unhandled size when dereferencing bounded pointer");
1057 sym
= external_global_sym(func
, &func_old_type
);
1059 put_extern_sym(sym
, NULL
, 0, 0);
1060 /* patch relocation */
1061 /* XXX: find a better solution ? */
1062 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1063 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1066 static void gen_bounds_prolog(void)
1068 /* leave some room for bound checking code */
1069 func_bound_offset
= lbounds_section
->data_offset
;
1070 func_bound_ind
= ind
;
1071 oad(0xb8, 0); /* lbound section pointer */
1072 oad(0xb8, 0); /* call to function */
1075 static void gen_bounds_epilog(void)
1081 /* add end of table info */
1082 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
1085 /* generate bound local allocation */
1087 ind
= func_bound_ind
;
1088 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
1089 func_bound_offset
, lbounds_section
->data_offset
);
1090 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
1092 gen_static_call(TOK___bound_local_new
);
1095 /* generate bound check local freeing */
1096 o(0x5250); /* save returned value, if any */
1097 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
1098 oad(0xb8, 0); /* mov %eax, xxx */
1099 gen_static_call(TOK___bound_local_delete
);
1100 o(0x585a); /* restore returned value, if any */
1104 /* Save the stack pointer onto the stack */
1105 ST_FUNC
void gen_vla_sp_save(int addr
) {
1106 /* mov %esp,addr(%ebp)*/
1108 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1111 /* Restore the SP from a location on the stack */
1112 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1114 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1117 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1118 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1121 #if defined(CONFIG_TCC_BCHECK)
1122 use_call
= tcc_state
->do_bounds_check
;
1124 #ifdef TCC_TARGET_PE /* alloca does more than just adjust %rsp on Windows */
1129 vpush_global_sym(&func_old_type
, TOK_alloca
);
1130 vswap(); /* Move alloca ref past allocation size */
1135 r
= gv(RC_INT
); /* allocation size */
1139 /* We align to 16 bytes rather than align */
1146 /* end of X86 code generator */
1147 /*************************************************************/
1149 /*************************************************************/