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/* $OpenBSD: code.c,v 1.2 2008/04/11 20:45:52 stefan Exp $ */
/*
* Copyright (c) 2008 David Crawshaw <david@zentus.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "pass1.h"
void
defloc(struct symtab *sp)
{
static char *loctbl[] = { "text", "data", "rodata" };
static int lastloc = -1;
TWORD t;
int s;
t = sp->stype;
s = ISFTN(t) ? PROG : ISCON(cqual(t, sp->squal)) ? RDATA : DATA;
if (s != lastloc)
printf("\n\t.section \".%s\"\n", loctbl[s]);
lastloc = s;
if (s == PROG)
return;
switch (DEUNSIGN(sp->stype)) {
case CHAR: s = 1;
case SHORT: s = 2;
case INT:
case UNSIGNED: s = 4;
default: s = 8;
}
printf("\t.align %d\n", s);
if (sp->sclass == EXTDEF)
printf("\t.global %s\n", sp->soname);
if (sp->slevel == 0) {
printf("\t.type %s,#object\n", sp->soname);
printf("\t.size %s," CONFMT "\n", sp->soname,
tsize(sp->stype, sp->sdf, sp->ssue) / SZCHAR);
printf("%s:\n", sp->soname);
} else
printf(LABFMT ":\n", sp->soffset);
}
void
efcode()
{
/* XXX */
}
void
bfcode(struct symtab **sp, int cnt)
{
int i, off;
NODE *p, *q;
struct symtab *sym;
/* Process the first six arguments. */
for (i=0; i < cnt && i < 6; i++) {
sym = sp[i];
q = block(REG, NIL, NIL, sym->stype, sym->sdf, sym->ssue);
q->n_rval = RETREG_PRE(sym->stype) + i;
p = tempnode(0, sym->stype, sym->sdf, sym->ssue);
sym->soffset = regno(p);
sym->sflags |= STNODE;
p = buildtree(ASSIGN, p, q);
ecomp(p);
}
/* Process the remaining arguments. */
for (off = V9RESERVE; i < cnt; i++) {
sym = sp[i];
spname = sym;
p = tempnode(0, sym->stype, sym->sdf, sym->ssue);
off = ALIGN(off, (tlen(p) - 1));
sym->soffset = off * SZCHAR;
off += tlen(p);
p = buildtree(ASSIGN, p, buildtree(NAME, 0, 0));
sym->soffset = regno(p->n_left);
sym->sflags |= STNODE;
ecomp(p);
}
}
void
bccode()
{
SETOFF(autooff, SZINT);
}
void
ejobcode(int flag)
{
}
void
bjobcode()
{
}
/*
* The first six 64-bit arguments are saved in the registers O0 to O5,
* which become I0 to I5 after the "save" instruction moves the register
* window. Arguments 7 and up must be saved on the stack to %sp+BIAS+176.
*
* For a pretty picture, see Figure 3-16 in the SPARC Compliance Def 2.4.
*/
static NODE *
moveargs(NODE *p, int *regp, int *stacksize)
{
NODE *r, *q;
if (p->n_op == CM) {
p->n_left = moveargs(p->n_left, regp, stacksize);
r = p->n_right;
} else {
r = p;
}
/* XXX more than six FP args can and should be passed in registers. */
if (*regp > 5 && r->n_op != STARG) {
/* We are storing the stack offset in n_rval. */
r = block(FUNARG, r, NIL, r->n_type, r->n_df, r->n_sue);
/* Make sure we are appropriately aligned. */
*stacksize = ALIGN(*stacksize, (tlen(r) - 1));
r->n_rval = *stacksize;
*stacksize += tlen(r);
} else if (r->n_op == STARG)
cerror("op STARG in moveargs");
else {
q = block(REG, NIL, NIL, r->n_type, r->n_df, r->n_sue);
/*
* The first six non-FP arguments go in the registers O0 - O5.
* Float arguments are stored in %fp1, %fp3, ..., %fp29, %fp31.
* Double arguments are stored in %fp0, %fp2, ..., %fp28, %fp30.
* A non-fp argument still increments register, eg.
* test(int a, int b, float b)
* takes %o0, %o1, %fp5.
*/
if (q->n_type == FLOAT)
q->n_rval = F0 + (*regp++ * 2) + 1;
else if (q->n_type == DOUBLE)
q->n_rval = D0 + *regp++;
else if (q->n_type == LDOUBLE)
cerror("long double support incomplete");
else
q->n_rval = O0 + (*regp)++;
r = buildtree(ASSIGN, q, r);
}
if (p->n_op == CM) {
p->n_right = r;
return p;
}
return r;
}
NODE *
funcode(NODE *p)
{
NODE *r, *l;
int reg = 0, stacksize = 0;
r = l = 0;
p->n_right = moveargs(p->n_right, ®, &stacksize);
/*
* This is a particularly gross and inefficient way to handle
* argument overflows. First, we calculate how much stack space
* we need in moveargs(). Then we assign it by moving %sp, make
* the function call, and then move %sp back.
*
* What we should be doing is getting the maximum of all the needed
* stacksize values to the prologue and doing it all in the "save"
* instruction.
*/
if (stacksize != 0) {
stacksize = V9STEP(stacksize); /* 16-bit alignment. */
r = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
r->n_lval = 0;
r->n_rval = SP;
r = block(MINUS, r, bcon(stacksize), INT, 0, MKSUE(INT));
l = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
l->n_lval = 0;
l->n_rval = SP;
r = buildtree(ASSIGN, l, r);
p = buildtree(COMOP, r, p);
r = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
r->n_lval = 0;
r->n_rval = SP;
r = block(PLUS, r, bcon(stacksize), INT, 0, MKSUE(INT));
l = block(REG, NIL, NIL, INT, 0, MKSUE(INT));
l->n_lval = 0;
l->n_rval = SP;
r = buildtree(ASSIGN, l, r);
p = buildtree(COMOP, p, r);
}
return p;
}
int
fldal(unsigned int t)
{
uerror("illegal field type");
return ALINT;
}
void
fldty(struct symtab *p)
{
}
int
mygenswitch(int num, TWORD type, struct swents **p, int n)
{
return 0;
}
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