From b3e6c9aab3f96ddf2c0be0832b70ab1e504bbb3c Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 20 Mar 2009 16:40:00 -0700
Subject: update 8a, 8c, 8l to use new object format.

add "extern register" support to 8c.
extern register means allocate in the FS-relative segment.

make 8l generate segmented stack checks.

R=ken
OCL=26600
CL=26606
---
 src/cmd/8c/gc.h   |  1 +
 src/cmd/8c/list.c |  4 ++++
 src/cmd/8c/sgen.c | 32 ++++++++++++++++++++++++++++++++
 src/cmd/8c/swt.c  | 15 ++++++++++++++-
 src/cmd/8c/txt.c  | 13 +++++++++++++
 5 files changed, 64 insertions(+), 1 deletion(-)

(limited to 'src/cmd/8c')

diff --git a/src/cmd/8c/gc.h b/src/cmd/8c/gc.h
index c30eb55bc..55a37c42c 100644
--- a/src/cmd/8c/gc.h
+++ b/src/cmd/8c/gc.h
@@ -66,6 +66,7 @@ EXTERN	struct
 struct	Adr
 {
 	int32	offset;
+	int32	offset2;
 	double	dval;
 	char	sval[NSNAME];
 
diff --git a/src/cmd/8c/list.c b/src/cmd/8c/list.c
index d700b63af..ec5ac9d60 100644
--- a/src/cmd/8c/list.c
+++ b/src/cmd/8c/list.c
@@ -154,6 +154,10 @@ Dconv(Fmt *fp)
 		sprint(str, "$%ld", a->offset);
 		break;
 
+	case D_CONST2:
+		sprint(str, "$%ld-%ld", a->offset, a->offset2);
+		break;
+
 	case D_FCONST:
 		sprint(str, "$(%.17e)", a->dval);
 		break;
diff --git a/src/cmd/8c/sgen.c b/src/cmd/8c/sgen.c
index 14bd32adb..c4d5665d8 100644
--- a/src/cmd/8c/sgen.c
+++ b/src/cmd/8c/sgen.c
@@ -30,6 +30,31 @@
 
 #include "gc.h"
 
+int32
+argsize(void)
+{
+	Type *t;
+	int32 s;
+
+//print("t=%T\n", thisfn);
+	s = 0;
+	for(t=thisfn->down; t!=T; t=t->down) {
+		switch(t->etype) {
+		case TVOID:
+			break;
+		case TDOT:
+			s += 64;
+			break;
+		default:
+			s = align(s, t, Aarg1);
+			s = align(s, t, Aarg2);
+			break;
+		}
+//print("	%d %T\n", s, t);
+	}
+	return (s+7) & ~7;
+}
+
 void
 codgen(Node *n, Node *nn)
 {
@@ -52,7 +77,10 @@ codgen(Node *n, Node *nn)
 			break;
 	}
 	nearln = nn->lineno;
+
 	gpseudo(ATEXT, n1->sym, nodconst(stkoff));
+	p->to.type = D_CONST2;
+	p->to.offset2 = argsize();
 
 	/*
 	 * isolate first argument
@@ -494,6 +522,10 @@ xcom(Node *n)
 			n->addable = 11;
 		break;
 
+	case OEXREG:
+		n->addable = 10;
+		break;
+
 	case OREGISTER:
 		n->addable = 12;
 		break;
diff --git a/src/cmd/8c/swt.c b/src/cmd/8c/swt.c
index 13e9a51e3..6d693337a 100644
--- a/src/cmd/8c/swt.c
+++ b/src/cmd/8c/swt.c
@@ -328,7 +328,10 @@ outcode(void)
 		return;
 	}
 	Binit(&b, f, OWRITE);
-	Bseek(&b, 0L, 2);
+
+	Bprint(&b, "%s\n", thestring);
+	Bprint(&b, "!\n");
+
 	outhist(&b);
 	for(sym=0; sym<NSYM; sym++) {
 		h[sym].sym = S;
@@ -530,6 +533,9 @@ zaddr(Biobuf *b, Adr *a, int s)
 	case D_SCONST:
 		t |= T_SCONST;
 		break;
+	case D_CONST2:
+		t |= T_OFFSET|T_OFFSET2;
+		break;
 	}
 	Bputc(b, t);
 
@@ -544,6 +550,13 @@ zaddr(Biobuf *b, Adr *a, int s)
 		Bputc(b, l>>16);
 		Bputc(b, l>>24);
 	}
+	if(t & T_OFFSET2) {	/* implies offset2 */
+		l = a->offset2;
+		Bputc(b, l);
+		Bputc(b, l>>8);
+		Bputc(b, l>>16);
+		Bputc(b, l>>24);
+	}
 	if(t & T_SYM)		/* implies sym */
 		Bputc(b, s);
 	if(t & T_FCONST) {
diff --git a/src/cmd/8c/txt.c b/src/cmd/8c/txt.c
index 4e95f3c7a..5cc43e0e9 100644
--- a/src/cmd/8c/txt.c
+++ b/src/cmd/8c/txt.c
@@ -449,6 +449,10 @@ naddr(Node *n, Adr *a)
 		a->sym = S;
 		break;
 
+	case OEXREG:
+		a->type = D_INDIR + D_FS;
+		a->offset = n->reg - 1;
+		break;
 
 	case OIND:
 		naddr(n->left, a);
@@ -1389,6 +1393,15 @@ sconst(Node *n)
 int32
 exreg(Type *t)
 {
+	int32 o;
+
+	if(typechlp[t->etype]){
+		if(exregoffset >= 32)
+			return 0;
+		o = exregoffset;
+		exregoffset += 4;
+		return o+1;	// +1 to avoid 0 == failure; naddr case OEXREG will -1.
+	}
 
 	USED(t);
 	return 0;
-- 
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