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kolibrios-fun/programs/develop/ktcc/trunk/source/arm-gen.c
andrew_programmer 16f5992719 Mistakes in functions of work with files and with system calls KolibriOS are corrected. 
New functions for work with system calls KolibriOS are added. Functions for format output 
are added: printf (), fprintf (), sprintf (), snprintf (), vsnprintf (). For material 
numbers it is meanwhile supported only format output the (%f), and exponential output a (%e)
is not realized yet. 
Functions for format output correctly work only in GCC because TinyC incorrectly works with
the functions containing variable number of arguments.

git-svn-id: svn://kolibrios.org@647 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-10-15 09:42:17 +00:00

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/*
* ARMv4 code generator for TCC
*
* Copyright (c) 2003 Daniel Glöckner
*
* Based on i386-gen.c by Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* number of available registers */
#define NB_REGS 9
/* a register can belong to several classes. The classes must be
sorted from more general to more precise (see gv2() code which does
assumptions on it). */
#define RC_INT 0x0001 /* generic integer register */
#define RC_FLOAT 0x0002 /* generic float register */
#define RC_R0 0x0004
#define RC_R1 0x0008
#define RC_R2 0x0010
#define RC_R3 0x0020
#define RC_R12 0x0040
#define RC_F0 0x0080
#define RC_F1 0x0100
#define RC_F2 0x0200
#define RC_F3 0x0400
#define RC_IRET RC_R0 /* function return: integer register */
#define RC_LRET RC_R1 /* function return: second integer register */
#define RC_FRET RC_F0 /* function return: float register */
/* pretty names for the registers */
enum {
TREG_R0 = 0,
TREG_R1,
TREG_R2,
TREG_R3,
TREG_R12,
TREG_F0,
TREG_F1,
TREG_F2,
TREG_F3,
};
int reg_classes[NB_REGS] = {
/* r0 */ RC_INT | RC_R0,
/* r1 */ RC_INT | RC_R1,
/* r2 */ RC_INT | RC_R2,
/* r3 */ RC_INT | RC_R3,
/* r12 */ RC_INT | RC_R12,
/* f0 */ RC_FLOAT | RC_F0,
/* f1 */ RC_FLOAT | RC_F1,
/* f2 */ RC_FLOAT | RC_F2,
/* f3 */ RC_FLOAT | RC_F3,
};
static int two2mask(int a,int b) {
return (reg_classes[a]|reg_classes[b])&~(RC_INT|RC_FLOAT);
}
static int regmask(int r) {
return reg_classes[r]&~(RC_INT|RC_FLOAT);
}
/* return registers for function */
#define REG_IRET TREG_R0 /* single word int return register */
#define REG_LRET TREG_R1 /* second word return register (for long long) */
#define REG_FRET TREG_F0 /* float return register */
/* defined if function parameters must be evaluated in reverse order */
#define INVERT_FUNC_PARAMS
/* defined if structures are passed as pointers. Otherwise structures
are directly pushed on stack. */
//#define FUNC_STRUCT_PARAM_AS_PTR
/* pointer size, in bytes */
#define PTR_SIZE 4
/* long double size and alignment, in bytes */
#define LDOUBLE_SIZE 8
#define LDOUBLE_ALIGN 4
/* maximum alignment (for aligned attribute support) */
#define MAX_ALIGN 8
#define CHAR_IS_UNSIGNED
/******************************************************/
/* ELF defines */
#define EM_TCC_TARGET EM_ARM
/* relocation type for 32 bit data relocation */
#define R_DATA_32 R_ARM_ABS32
#define R_JMP_SLOT R_ARM_JUMP_SLOT
#define R_COPY R_ARM_COPY
#define ELF_START_ADDR 0x00008000
#define ELF_PAGE_SIZE 0x1000
/******************************************************/
static unsigned long func_sub_sp_offset,last_itod_magic;
void o(unsigned long i)
{
/* this is a good place to start adding big-endian support*/
int ind1;
ind1 = ind + 4;
if (!cur_text_section)
error("compiler error! This happens f.ex. if the compiler\n"
"can't evaluate constant expressions outside of a function.");
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i;
}
static unsigned long stuff_const(unsigned long op,unsigned long c)
{
int try_neg=0;
unsigned long nc = 0,negop = 0;
switch(op&0x1F00000)
{
case 0x800000: //add
case 0x400000: //sub
try_neg=1;
negop=op^0xC00000;
nc=-c;
break;
case 0x1A00000: //mov
case 0x1E00000: //mvn
try_neg=1;
negop=op^0x400000;
nc=~c;
break;
case 0x200000: //xor
if(c==~0)
return (op&0xF010F000)|((op>>16)&0xF)|0x1E00000;
break;
case 0x0: //and
if(c==~0)
return (op&0xF010F000)|((op>>16)&0xF)|0x1A00000;
case 0x1C00000: //bic
try_neg=1;
negop=op^0x1C00000;
nc=~c;
break;
case 0x1800000: //orr
if(c==~0)
return (op&0xFFF0FFFF)|0x1E00000;
break;
}
do {
unsigned long m;
int i;
if(c<256) /* catch undefined <<32 */
return op|c;
for(i=2;i<32;i+=2) {
m=(0xff>>i)|(0xff<<(32-i));
if(!(c&~m))
return op|(i<<7)|(c<<i)|(c>>(32-i));
}
op=negop;
c=nc;
} while(try_neg--);
return 0;
}
//only add,sub
void stuff_const_harder(unsigned long op,unsigned long v) {
unsigned long x;
x=stuff_const(op,v);
if(x)
o(x);
else {
unsigned long a[16],nv,no,o2,n2;
int i,j,k;
a[0]=0xff;
o2=(op&0xfff0ffff)|((op&0xf000)<<4);;
for(i=1;i<16;i++)
a[i]=(a[i-1]>>2)|(a[i-1]<<30);
for(i=0;i<12;i++)
for(j=i+4;i<13+i;i++)
if((v&(a[i]|a[j]))==v) {
o(stuff_const(op,v&a[i]));
o(stuff_const(o2,v&a[j]));
return;
}
no=op^0xC00000;
n2=o2^0xC00000;
nv=-v;
for(i=0;i<12;i++)
for(j=i+4;i<13+i;i++)
if((nv&(a[i]|a[j]))==nv) {
o(stuff_const(no,nv&a[i]));
o(stuff_const(n2,nv&a[j]));
return;
}
for(i=0;i<8;i++)
for(j=i+4;i<12;i++)
for(k=j+4;k<13+i;i++)
if((v&(a[i]|a[j]|a[k]))==v) {
o(stuff_const(op,v&a[i]));
o(stuff_const(o2,v&a[j]));
o(stuff_const(o2,v&a[k]));
return;
}
no=op^0xC00000;
nv=-v;
for(i=0;i<8;i++)
for(j=i+4;i<12;i++)
for(k=j+4;k<13+i;i++)
if((nv&(a[i]|a[j]|a[k]))==nv) {
o(stuff_const(no,nv&a[i]));
o(stuff_const(n2,nv&a[j]));
o(stuff_const(n2,nv&a[k]));
return;
}
o(stuff_const(op,v&a[0]));
o(stuff_const(o2,v&a[4]));
o(stuff_const(o2,v&a[8]));
o(stuff_const(o2,v&a[12]));
}
}
unsigned long encbranch(int pos,int addr,int fail)
{
addr-=pos+8;
addr/=4;
if(addr>=0x1000000 || addr<-0x1000000) {
if(fail)
error("FIXME: function bigger than 32MB");
return 0;
}
return 0x0A000000|(addr&0xffffff);
}
int decbranch(int pos)
{
int x;
x=*(int *)(cur_text_section->data + pos);
x&=0x00ffffff;
if(x&0x800000)
x-=0x1000000;
return x*4+pos+8;
}
/* output a symbol and patch all calls to it */
void gsym_addr(int t, int a)
{
unsigned long *x;
int lt;
while(t) {
x=(unsigned long *)(cur_text_section->data + t);
t=decbranch(lt=t);
if(a==lt+4)
*x=0xE1A00000; // nop
else {
*x &= 0xff000000;
*x |= encbranch(lt,a,1);
}
}
}
void gsym(int t)
{
gsym_addr(t, ind);
}
static unsigned long fpr(int r)
{
if(r<TREG_F0 || r>TREG_F3)
error("compiler error! register %i is no fp register\n",r);
return r-5;
}
static unsigned long intr(int r)
{
if(r==4)
return 12;
if((r<0 || r>4) && r!=14)
error("compiler error! register %i is no int register\n",r);
return r;
}
static void calcaddr(unsigned long *base,int *off,int *sgn,int maxoff,unsigned shift)
{
if(*off>maxoff || *off&((1<<shift)-1)) {
unsigned long x,y;
x=0xE280E000;
if(*sgn)
x=0xE240E000;
x|=(*base)<<16;
*base=14; // lr
y=stuff_const(x,*off&~maxoff);
if(y) {
o(y);
*off&=maxoff;
return;
}
y=stuff_const(x,(*off+maxoff)&~maxoff);
if(y) {
o(y);
*sgn=!*sgn;
*off=((*off+maxoff)&~maxoff)-*off;
return;
}
stuff_const_harder(x,*off&~maxoff);
*off&=maxoff;
}
}
static unsigned long mapcc(int cc)
{
switch(cc)
{
case TOK_ULT:
return 0x30000000;
case TOK_UGE:
return 0x20000000;
case TOK_EQ:
return 0x00000000;
case TOK_NE:
return 0x10000000;
case TOK_ULE:
return 0x90000000;
case TOK_UGT:
return 0x80000000;
case TOK_LT:
return 0xB0000000;
case TOK_GE:
return 0xA0000000;
case TOK_LE:
return 0xD0000000;
case TOK_GT:
return 0xC0000000;
}
error("unexpected condition code");
return 0xE0000000;
}
static int negcc(int cc)
{
switch(cc)
{
case TOK_ULT:
return TOK_UGE;
case TOK_UGE:
return TOK_ULT;
case TOK_EQ:
return TOK_NE;
case TOK_NE:
return TOK_EQ;
case TOK_ULE:
return TOK_UGT;
case TOK_UGT:
return TOK_ULE;
case TOK_LT:
return TOK_GE;
case TOK_GE:
return TOK_LT;
case TOK_LE:
return TOK_GT;
case TOK_GT:
return TOK_LE;
}
error("unexpected condition code");
return TOK_NE;
}
/* load 'r' from value 'sv' */
void load(int r, SValue *sv)
{
int v, ft, fc, fr, sign;
unsigned long op;
SValue v1;
fr = sv->r;
ft = sv->type.t;
fc = sv->c.ul;
if(fc>=0)
sign=0;
else {
sign=1;
fc=-fc;
}
v = fr & VT_VALMASK;
if (fr & VT_LVAL) {
unsigned long base=0xB; // fp
if(v == VT_LLOCAL) {
v1.type.t = VT_PTR;
v1.r = VT_LOCAL | VT_LVAL;
v1.c.ul = sv->c.ul;
load(base=14 /* lr */, &v1);
fc=sign=0;
v=VT_LOCAL;
} else if(v == VT_CONST) {
v1.type.t = VT_PTR;
v1.r = fr&~VT_LVAL;
v1.c.ul = sv->c.ul;
v1.sym=sv->sym;
load(base=14, &v1);
fc=sign=0;
v=VT_LOCAL;
} else if(v < VT_CONST) {
base=intr(v);
fc=sign=0;
v=VT_LOCAL;
}
if(v == VT_LOCAL) {
if(is_float(ft)) {
calcaddr(&base,&fc,&sign,1020,2);
op=0xED100100;
if(!sign)
op|=0x800000;
#if LDOUBLE_SIZE == 8
if ((ft & VT_BTYPE) != VT_FLOAT)
op|=0x8000;
#else
if ((ft & VT_BTYPE) == VT_DOUBLE)
op|=0x8000;
else if ((ft & VT_BTYPE) == VT_LDOUBLE)
op|=0x400000;
#endif
o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
} else if((ft & VT_TYPE) == VT_BYTE || (ft & VT_BTYPE) == VT_SHORT) {
calcaddr(&base,&fc,&sign,255,0);
op=0xE1500090;
if ((ft & VT_BTYPE) == VT_SHORT)
op|=0x20;
if ((ft & VT_UNSIGNED) == 0)
op|=0x40;
if(!sign)
op|=0x800000;
o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
} else {
calcaddr(&base,&fc,&sign,4095,0);
op=0xE5100000;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) == VT_BYTE)
op|=0x400000;
o(op|(intr(r)<<12)|fc|(base<<16));
}
return;
}
} else {
if (v == VT_CONST) {
op=stuff_const(0xE3A00000|(intr(r)<<12),sv->c.ul);
if (fr & VT_SYM || !op) {
o(0xE59F0000|(intr(r)<<12));
o(0xEA000000);
if(fr & VT_SYM)
greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
o(sv->c.ul);
} else
o(op);
return;
} else if (v == VT_LOCAL) {
op=stuff_const(0xE28B0000|(intr(r)<<12),sv->c.ul);
if (fr & VT_SYM || !op) {
o(0xE59F0000|(intr(r)<<12));
o(0xEA000000);
if(fr & VT_SYM) // needed ?
greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
o(sv->c.ul);
o(0xE08B0000|(intr(r)<<12)|intr(r));
} else
o(op);
return;
} else if(v == VT_CMP) {
o(mapcc(sv->c.ul)|0x3A00001|(intr(r)<<12));
o(mapcc(negcc(sv->c.ul))|0x3A00000|(intr(r)<<12));
return;
} else if (v == VT_JMP || v == VT_JMPI) {
int t;
t = v & 1;
o(0xE3A00000|(intr(r)<<12)|t);
o(0xEA000000);
gsym(sv->c.ul);
o(0xE3A00000|(intr(r)<<12)|(t^1));
return;
} else if (v < VT_CONST) {
if(is_float(ft))
o(0xEE008180|(fpr(r)<<12)|fpr(v));
else
o(0xE1A00000|(intr(r)<<12)|intr(v));
return;
}
}
error("load unimplemented!");
}
/* store register 'r' in lvalue 'v' */
void store(int r, SValue *sv)
{
SValue v1;
int v, ft, fc, fr, sign;
unsigned long op;
fr = sv->r;
ft = sv->type.t;
fc = sv->c.ul;
if(fc>=0)
sign=0;
else {
sign=1;
fc=-fc;
}
v = fr & VT_VALMASK;
if (fr & VT_LVAL || fr == VT_LOCAL) {
unsigned long base=0xb;
if(v < VT_CONST) {
base=intr(v);
v=VT_LOCAL;
fc=sign=0;
} else if(v == VT_CONST) {
v1.type.t = ft;
v1.r = fr&~VT_LVAL;
v1.c.ul = sv->c.ul;
v1.sym=sv->sym;
load(base=14, &v1);
fc=sign=0;
v=VT_LOCAL;
}
if(v == VT_LOCAL) {
if(is_float(ft)) {
calcaddr(&base,&fc,&sign,1020,2);
op=0xED000100;
if(!sign)
op|=0x800000;
#if LDOUBLE_SIZE == 8
if ((ft & VT_BTYPE) != VT_FLOAT)
op|=0x8000;
#else
if ((ft & VT_BTYPE) == VT_DOUBLE)
op|=0x8000;
if ((ft & VT_BTYPE) == VT_LDOUBLE)
op|=0x400000;
#endif
o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
return;
} else if((ft & VT_BTYPE) == VT_SHORT) {
calcaddr(&base,&fc,&sign,255,0);
op=0xE14000B0;
if(!sign)
op|=0x800000;
o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
} else {
calcaddr(&base,&fc,&sign,4095,0);
op=0xE5000000;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) == VT_BYTE)
op|=0x400000;
o(op|(intr(r)<<12)|fc|(base<<16));
}
return;
}
}
error("store unimplemented");
}
static void gadd_sp(int val)
{
stuff_const_harder(0xE28DD000,val);
}
/* 'is_jmp' is '1' if it is a jump */
static void gcall_or_jmp(int is_jmp)
{
int r;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
unsigned long x;
/* constant case */
x=encbranch(ind,ind+vtop->c.ul,0);
if(x) {
if (vtop->r & VT_SYM) {
/* relocation case */
greloc(cur_text_section, vtop->sym, ind, R_ARM_PC24);
} else
put_elf_reloc(symtab_section, cur_text_section, ind, R_ARM_PC24, 0);
o(x|(is_jmp?0xE0000000:0xE1000000));
} else {
if(!is_jmp)
o(0xE28FE004); // add lr,pc,#4
o(0xE51FF004); // ldr pc,[pc,#-4]
if (vtop->r & VT_SYM)
greloc(cur_text_section, vtop->sym, ind, R_ARM_ABS32);
o(vtop->c.ul);
}
} else {
/* otherwise, indirect call */
r = gv(RC_INT);
if(!is_jmp)
o(0xE1A0E00F); // mov lr,pc
o(0xE1A0F000|intr(r)); // mov pc,r
}
}
/* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the
parameters and the function address. */
void gfunc_call(int nb_args)
{
int size, align, r, args_size, i;
Sym *func_sym;
signed char plan[4][2]={{-1,-1},{-1,-1},{-1,-1},{-1,-1}};
int todo=0xf, keep, plan2[4]={0,0,0,0};
r = vtop->r & VT_VALMASK;
if (r == VT_CMP || (r & ~1) == VT_JMP)
gv(RC_INT);
args_size = 0;
for(i = nb_args ; i-- && args_size < 16 ;) {
if ((vtop[-i].type.t & VT_BTYPE) == VT_STRUCT) {
size = type_size(&vtop[-i].type, &align);
size = (size + 3) & ~3;
args_size += size;
} else if ((vtop[-i].type.t & VT_BTYPE) == VT_FLOAT)
args_size += 4;
else if ((vtop[-i].type.t & VT_BTYPE) == VT_DOUBLE)
args_size += 8;
else if ((vtop[-i].type.t & VT_BTYPE) == VT_LDOUBLE)
args_size += LDOUBLE_SIZE;
else {
plan[nb_args-1-i][0]=args_size/4;
args_size += 4;
if ((vtop[-i].type.t & VT_BTYPE) == VT_LLONG && args_size < 16) {
plan[nb_args-1-i][1]=args_size/4;
args_size += 4;
}
}
}
args_size = keep = 0;
for(i = 0;i < nb_args; i++) {
vnrott(keep+1);
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
size = type_size(&vtop->type, &align);
/* align to stack align size */
size = (size + 3) & ~3;
/* allocate the necessary size on stack */
gadd_sp(-size);
/* generate structure store */
r = get_reg(RC_INT);
o(0xE1A0000D|(intr(r)<<12));
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore();
vtop--;
args_size += size;
} else if (is_float(vtop->type.t)) {
r=fpr(gv(RC_FLOAT))<<12;
if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
size = 4;
else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
size = 8;
else
size = LDOUBLE_SIZE;
if (size == 12)
r|=0x400000;
else if(size == 8)
r|=0x8000;
o(0xED2D0100|r|(size>>2));
vtop--;
args_size += size;
} else {
int s;
/* simple type (currently always same size) */
/* XXX: implicit cast ? */
size=4;
if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
lexpand_nr();
s=RC_INT;
if(nb_args-i<5 && plan[nb_args-i-1][1]!=-1) {
s=regmask(plan[nb_args-i-1][1]);
todo&=~(1<<plan[nb_args-i-1][1]);
}
if(s==RC_INT) {
r = gv(s);
o(0xE52D0004|(intr(r)<<12)); /* str r,[sp,#-4]! */
vtop--;
} else {
plan2[keep]=s;
keep++;
vswap();
}
size = 8;
}
s=RC_INT;
if(nb_args-i<5 && plan[nb_args-i-1][0]!=-1) {
s=regmask(plan[nb_args-i-1][0]);
todo&=~(1<<plan[nb_args-i-1][0]);
}
if(s==RC_INT) {
r = gv(s);
o(0xE52D0004|(intr(r)<<12)); /* str r,[sp,#-4]! */
vtop--;
} else {
plan2[keep]=s;
keep++;
}
args_size += size;
}
}
for(i=keep;i--;) {
gv(plan2[i]);
vrott(keep);
}
save_regs(keep); /* save used temporary registers */
keep++;
if(args_size) {
int n;
n=args_size/4;
if(n>4)
n=4;
todo&=((1<<n)-1);
if(todo) {
int i;
o(0xE8BD0000|todo);
for(i=0;i<4;i++)
if(todo&(1<<i)) {
vpushi(0);
vtop->r=i;
keep++;
}
}
args_size-=n*4;
}
vnrott(keep);
func_sym = vtop->type.ref;
gcall_or_jmp(0);
if (args_size)
gadd_sp(args_size);
vtop-=keep;
}
/* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type)
{
Sym *sym,*sym2;
int n,addr,size,align;
sym = func_type->ref;
func_vt = sym->type;
n=0;
addr=12;
if((func_vt.t & VT_BTYPE) == VT_STRUCT) {
func_vc = addr;
addr += 4;
n++;
}
for(sym2=sym->next;sym2 && n<4;sym2=sym2->next) {
size = type_size(&sym2->type, &align);
size = (size + 3) & ~3;
n+=size/4;
}
o(0xE1A0C00D); /* mov ip,sp */
if(func_type->ref->c == FUNC_ELLIPSIS)
n=4;
if(n) {
if(n>4)
n=4;
o(0xE92D0000|((1<<n)-1)); /* save r0-r4 on stack if needed */
}
o(0xE92D5800); /* save fp, ip, lr*/
o(0xE1A0B00D); /* mov fp,sp */
func_sub_sp_offset = ind;
o(0xE1A00000); /* nop, leave space for stack adjustment */
while ((sym = sym->next)) {
CType *type;
type = &sym->type;
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL, addr);
size = type_size(type, &align);
size = (size + 3) & ~3;
addr += size;
}
last_itod_magic=0;
loc = 0;
}
/* generate function epilog */
void gfunc_epilog(void)
{
unsigned long x;
o(0xE89BA800); /* restore fp, sp, pc */
if(loc) {
x=stuff_const(0xE24DD000, (-loc + 3) & -4); /* sub sp,sp,# */
if(x)
*(unsigned long *)(cur_text_section->data + func_sub_sp_offset) = x;
else {
unsigned long addr;
addr=ind;
o(0xE59FC004); /* ldr ip,[pc+4] */
o(0xE04DD00C); /* sub sp,sp,ip */
o(0xE1A0F00E); /* mov pc,lr */
o((-loc + 3) & -4);
*(unsigned long *)(cur_text_section->data + func_sub_sp_offset) = 0xE1000000|encbranch(func_sub_sp_offset,addr,1);
}
}
}
/* generate a jump to a label */
int gjmp(int t)
{
int r;
r=ind;
o(0xE0000000|encbranch(r,t,1));
return r;
}
/* generate a jump to a fixed address */
void gjmp_addr(int a)
{
gjmp(a);
}
/* generate a test. set 'inv' to invert test. Stack entry is popped */
int gtst(int inv, int t)
{
int v, r;
unsigned long op;
v = vtop->r & VT_VALMASK;
r=ind;
if (v == VT_CMP) {
op=mapcc(inv?negcc(vtop->c.i):vtop->c.i);
op|=encbranch(r,t,1);
o(op);
t=r;
} else if (v == VT_JMP || v == VT_JMPI) {
if ((v & 1) == inv) {
if(!vtop->c.i)
vtop->c.i=t;
else {
unsigned long *x;
int p,lp;
if(t) {
p = vtop->c.i;
do {
p = decbranch(lp=p);
} while(p);
x = (unsigned long *)(cur_text_section->data + lp);
*x &= 0xff000000;
*x |= encbranch(lp,t,1);
}
t = vtop->c.i;
}
} else {
t = gjmp(t);
gsym(vtop->c.i);
}
} else {
if (is_float(vtop->type.t)) {
r=gv(RC_FLOAT);
o(0xEE90F118|fpr(r)<<16);
vtop->r = VT_CMP;
vtop->c.i = TOK_NE;
return gtst(inv, t);
} else if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
/* constant jmp optimization */
if ((vtop->c.i != 0) != inv)
t = gjmp(t);
} else {
v = gv(RC_INT);
o(0xE3300000|(intr(v)<<16));
vtop->r = VT_CMP;
vtop->c.i = TOK_NE;
return gtst(inv, t);
}
}
vtop--;
return t;
}
/* generate an integer binary operation */
void gen_opi(int op)
{
int c, func = 0;
unsigned long opc = 0,r,fr;
c=0;
switch(op) {
case '+':
opc = 0x8;
c=1;
break;
case TOK_ADDC1: /* add with carry generation */
opc = 0x9;
c=1;
break;
case '-':
opc = 0x4;
c=1;
break;
case TOK_SUBC1: /* sub with carry generation */
opc = 0x5;
c=1;
break;
case TOK_ADDC2: /* add with carry use */
opc = 0xA;
c=1;
break;
case TOK_SUBC2: /* sub with carry use */
opc = 0xC;
c=1;
break;
case '&':
opc = 0x0;
c=1;
break;
case '^':
opc = 0x2;
c=1;
break;
case '|':
opc = 0x18;
c=1;
break;
case '*':
gv2(RC_INT, RC_INT);
r = vtop[-1].r;
fr = vtop[0].r;
vtop--;
o(0xE0000090|(intr(r)<<16)|(intr(r)<<8)|intr(fr));
return;
case TOK_SHL:
opc = 0;
c=2;
break;
case TOK_SHR:
opc = 1;
c=2;
break;
case TOK_SAR:
opc = 2;
c=2;
break;
case '/':
case TOK_PDIV:
func=TOK___divsi3;
c=3;
break;
case TOK_UDIV:
func=TOK___udivsi3;
c=3;
break;
case '%':
func=TOK___modsi3;
c=3;
break;
case TOK_UMOD:
func=TOK___umodsi3;
c=3;
break;
case TOK_UMULL:
gv2(RC_INT, RC_INT);
r=intr(vtop[-1].r2=get_reg(RC_INT));
c=vtop[-1].r;
vtop[-1].r=get_reg_ex(RC_INT,regmask(c));
vtop--;
o(0xE0800090|(r<<16)|(intr(vtop->r)<<12)|(intr(c)<<8)|intr(vtop[1].r));
return;
default:
opc = 0x15;
c=1;
break;
}
switch(c) {
case 1:
if((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
if(opc == 4 || opc == 5 || opc == 0xc) {
vswap();
opc|=2; // sub -> rsb
}
}
if ((vtop->r & VT_VALMASK) == VT_CMP ||
(vtop->r & (VT_VALMASK & ~1)) == VT_JMP)
gv(RC_INT);
vswap();
c=intr(gv(RC_INT));
vswap();
opc=0xE0000000|(opc<<20)|(c<<16);
if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
unsigned long x;
x=stuff_const(opc|0x2000000,vtop->c.i);
if(x) {
r=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
o(x|(r<<12));
goto done;
}
}
fr=intr(gv(RC_INT));
r=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
o(opc|(r<<12)|fr);
done:
vtop--;
if (op >= TOK_ULT && op <= TOK_GT) {
vtop->r = VT_CMP;
vtop->c.i = op;
}
break;
case 2:
opc=0xE1A00000|(opc<<5);
if ((vtop->r & VT_VALMASK) == VT_CMP ||
(vtop->r & (VT_VALMASK & ~1)) == VT_JMP)
gv(RC_INT);
vswap();
r=intr(gv(RC_INT));
vswap();
opc|=r;
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
fr=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
c = vtop->c.i & 0x1f;
o(opc|(c<<7)|(fr<<12));
} else {
fr=intr(gv(RC_INT));
c=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
o(opc|(c<<12)|(fr<<8)|0x10);
}
vtop--;
break;
case 3:
vpush_global_sym(&func_old_type, func);
vrott(3);
gfunc_call(2);
vpushi(0);
vtop->r = REG_IRET;
break;
default:
error("gen_opi %i unimplemented!",op);
}
}
static int is_fconst()
{
long double f;
int r;
if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
return 0;
if (vtop->type.t == VT_FLOAT)
f = vtop->c.f;
else if (vtop->type.t == VT_DOUBLE)
f = vtop->c.d;
else
f = vtop->c.ld;
if(!ieee_finite(f))
return 0;
r=0x8;
if(f<0.0) {
r=0x18;
f=-f;
}
if(f==0.0)
return r;
if(f==1.0)
return r|1;
if(f==2.0)
return r|2;
if(f==3.0)
return r|3;
if(f==4.0)
return r|4;
if(f==5.0)
return r|5;
if(f==0.5)
return r|6;
if(f==10.0)
return r|7;
return 0;
}
/* generate a floating point operation 'v = t1 op t2' instruction. The
two operands are guaranted to have the same floating point type */
void gen_opf(int op)
{
unsigned long x;
int r,r2,c1,c2;
//fputs("gen_opf\n",stderr);
vswap();
c1 = is_fconst();
vswap();
c2 = is_fconst();
x=0xEE000100;
#if LDOUBLE_SIZE == 8
if ((vtop->type.t & VT_BTYPE) != VT_FLOAT)
x|=0x80;
#else
if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
x|=0x80;
else if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE)
x|=0x80000;
#endif
switch(op)
{
case '+':
if(!c2) {
vswap();
c2=c1;
}
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2) {
if(c2>0xf)
x|=0x200000; // suf
r2=c2&0xf;
} else {
r2=fpr(gv(RC_FLOAT));
}
break;
case '-':
if(c2) {
if(c2<=0xf)
x|=0x200000; // suf
r2=c2&0xf;
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
} else if(c1 && c1<=0xf) {
x|=0x300000; // rsf
r2=c1;
r=fpr(gv(RC_FLOAT));
vswap();
} else {
x|=0x200000; // suf
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
r2=fpr(gv(RC_FLOAT));
}
break;
case '*':
if(!c2 || c2>0xf) {
vswap();
c2=c1;
}
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2 && c2<=0xf)
r2=c2;
else
r2=fpr(gv(RC_FLOAT));
x|=0x100000; // muf
break;
case '/':
if(c2 && c2<=0xf) {
x|=0x400000; // dvf
r2=c2;
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
} else if(c1 && c1<=0xf) {
x|=0x500000; // rdf
r2=c1;
r=fpr(gv(RC_FLOAT));
vswap();
} else {
x|=0x400000; // dvf
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
r2=fpr(gv(RC_FLOAT));
}
break;
default:
if(op >= TOK_ULT && op <= TOK_GT) {
x|=0xd0f110; // cmfe
switch(op) {
case TOK_ULT:
case TOK_UGE:
case TOK_ULE:
case TOK_UGT:
fputs("unsigned comparision on floats?\n",stderr);
break;
case TOK_LT:
op=TOK_ULT;
break;
case TOK_GE:
op=TOK_UGE;
break;
case TOK_LE:
op=TOK_ULE;
break;
case TOK_GT:
op=TOK_UGT;
break;
case TOK_EQ:
case TOK_NE:
x&=~0x400000; // cmfe -> cmf
break;
}
if(c1 && !c2) {
c2=c1;
vswap();
switch(op) {
case TOK_ULT:
op=TOK_UGT;
break;
case TOK_UGE:
op=TOK_ULE;
break;
case TOK_ULE:
op=TOK_UGE;
break;
case TOK_UGT:
op=TOK_ULT;
break;
}
}
// bug (intention?) in Linux FPU emulator
// doesn't set carry if equal
if(op==TOK_ULT)
op=TOK_LT;
else if(op==TOK_UGE)
op=TOK_GE;
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2) {
if(c2>0xf)
x|=0x200000;
r2=c2&0xf;
} else {
r2=fpr(gv(RC_FLOAT));
}
vtop[-1].r = VT_CMP;
vtop[-1].c.i = op;
} else {
error("unknown fp op %x!\n",op);
return;
}
}
if(vtop[-1].r == VT_CMP)
c1=15;
else {
c1=vtop->r;
if(r2&0x8)
c1=vtop[-1].r;
vtop[-1].r=get_reg_ex(RC_FLOAT,two2mask(vtop[-1].r,c1));
c1=fpr(vtop[-1].r);
}
vtop--;
o(x|(r<<16)|(c1<<12)|r2);
}
/* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
and 'long long' cases. */
void gen_cvt_itof(int t)
{
int r,r2,bt;
bt=vtop->type.t & VT_BTYPE;
if(bt == VT_INT || bt == VT_SHORT || bt == VT_BYTE) {
r=intr(gv(RC_INT));
r2=fpr(vtop->r=get_reg(RC_FLOAT));
o(0xEE000190|(r2<<16)|(r<<12));
if((vtop->type.t & (VT_UNSIGNED|VT_BTYPE)) == (VT_UNSIGNED|VT_INT)) {
unsigned int off=0;
o(0xE3500000|(r<<12));
r=fpr(get_reg(RC_FLOAT));
if(last_itod_magic) {
off=ind+8-last_itod_magic;
off/=4;
if(off>255)
off=0;
}
o(0xBD1F8100|(r<<12)|off);
if(!off) {
o(0xEA000001);
last_itod_magic=ind;
o(0x41F00000);
o(0);
}
o(0xBE000180|(r2<<16)|(r2<<12)|r);
}
return;
} else if(bt == VT_LLONG) {
int func;
if(vtop->type.t & VT_UNSIGNED)
func=TOK___ulltold;
else
func=TOK___slltold;
vpush_global_sym(&func_old_type, func);
vswap();
gfunc_call(1);
vpushi(0);
vtop->r=TREG_F0;
return;
}
error("unimplemented gen_cvt_itof %x!",vtop->type.t);
}
/* convert fp to int 't' type */
void gen_cvt_ftoi(int t)
{
int r,r2,u,func=0;
u=t&VT_UNSIGNED;
t&=VT_BTYPE;
r2=vtop->type.t & VT_BTYPE;
if(t==VT_INT) {
if(u) {
if(r2 == VT_FLOAT)
func=TOK___fixunssfsi;
else if(r2 == VT_DOUBLE)
func=TOK___fixunsdfsi;
else if(r2 == VT_LDOUBLE)
#if LDOUBLE_SIZE == 8
func=TOK___fixunsdfsi;
#else
func=TOK___fixunsxfsi;
#endif
} else {
r=fpr(gv(RC_FLOAT));
r2=intr(vtop->r=get_reg(RC_INT));
o(0xEE100170|(r2<<12)|r);
return;
}
} else if(t == VT_LLONG) { // unsigned handled in gen_cvt_ftoi1
if(r2 == VT_FLOAT)
func=TOK___fixsfdi;
else if(r2 == VT_DOUBLE)
func=TOK___fixdfdi;
else if(r2 == VT_LDOUBLE)
#if LDOUBLE_SIZE == 8
func=TOK___fixdfdi;
#else
func=TOK___fixxfdi;
#endif
}
if(func) {
vpush_global_sym(&func_old_type, func);
vswap();
gfunc_call(1);
vpushi(0);
if(t == VT_LLONG)
vtop->r2 = REG_LRET;
vtop->r = REG_IRET;
return;
}
error("unimplemented gen_cvt_ftoi!");
}
/* convert from one floating point type to another */
void gen_cvt_ftof(int t)
{
/* all we have to do on i386 and ARM is to put the float in a register */
gv(RC_FLOAT);
}
/* computed goto support */
void ggoto(void)
{
gcall_or_jmp(1);
vtop--;
}
/* end of ARM code generator */
/*************************************************************/
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