FreeBSD-specific porting work.

cgo/libmach remain unimplemented. However, compilers, runtime,
and packages are 100%. I still need to go through and implement
missing syscalls (at least make sure they're all listed), but
for all shipped functionality, this is done. Ship! ;)

R=rsc, VenkateshSrinivas
https://golang.org/cl/152142

4 files changed, 23 insertions, 2 deletions

diff --git a/src/cmd/6l/asm.c b/src/cmd/6l/asm.c
index 146245c7bd..a9ff7b47f7 100644
--- a/src/cmd/6l/asm.c
+++ b/src/cmd/6l/asm.c
@@ -38,6 +38,7 @@
 #define PADDR(a)	((uint32)(a) & ~0x80000000)
 
 char linuxdynld[] = "/lib64/ld-linux-x86-64.so.2";
+char freebsddynld[] = "/libexec/ld-elf.so.1";
 
 char	zeroes[32];
 
@@ -284,7 +285,7 @@ doelf(void)
 	Sym *s, *shstrtab, *dynamic, *dynstr, *d;
 	int h, nsym, t;
 
-	if(HEADTYPE != 7)
+	if(HEADTYPE != 7 && HEADTYPE != 9)
 		return;
 
 	/* predefine strings we need for section headers */
@@ -317,7 +318,14 @@ doelf(void)
 		s = lookup(".interp", 0);
 		s->reachable = 1;
 		s->type = SDATA;	// TODO: rodata
-		addstring(lookup(".interp", 0), linuxdynld);
+		switch(HEADTYPE) {
+		case 7:
+			addstring(lookup(".interp", 0), linuxdynld);
+			break;
+		case 9:
+			addstring(lookup(".interp", 0), freebsddynld);
+			break;
+		}
 
 		/*
 		 * hash table.
@@ -512,6 +520,7 @@ asmb(void)
 		break;
 
 	case 7:
+	case 9:
 		debug['8'] = 1;	/* 64-bit addresses */
 		v = rnd(HEADR+textsize, INITRND);
 		seek(cout, v, 0);
@@ -565,6 +574,7 @@ asmb(void)
 			symo = rnd(HEADR+textsize, INITRND)+rnd(datsize, INITRND)+machlink;
 			break;
 		case 7:
+		case 9:
 			symo = rnd(HEADR+textsize, INITRND)+datsize;
 			symo = rnd(symo, INITRND);
 			break;
@@ -649,6 +659,7 @@ asmb(void)
 		asmbmacho(symdatva, symo);
 		break;
 	case 7:
+	case 9:
 		/* elf amd-64 */
 
 		eh = getElfEhdr();
@@ -871,6 +882,8 @@ asmb(void)
 		eh->ident[EI_MAG1] = 'E';
 		eh->ident[EI_MAG2] = 'L';
 		eh->ident[EI_MAG3] = 'F';
+		if(HEADTYPE == 9)
+			eh->ident[EI_OSABI] = 9;
 		eh->ident[EI_CLASS] = ELFCLASS64;
 		eh->ident[EI_DATA] = ELFDATA2LSB;
 		eh->ident[EI_VERSION] = EV_CURRENT;
diff --git a/src/cmd/6l/obj.c b/src/cmd/6l/obj.c
index ffe93fce4d..63e2f95269 100644
--- a/src/cmd/6l/obj.c
+++ b/src/cmd/6l/obj.c
@@ -46,6 +46,7 @@ char*	paramspace	= "FP";
  *	-H5 -T0x80110000 -R4096		is ELF32
  *	-H6 -Tx -Rx			is apple MH-exec
  *	-H7 -Tx -Rx			is linux elf-exec
+ *      -H9 -Tx -Rx			is FreeBSD elf-exec
  *
  *	options used: 189BLQSWabcjlnpsvz
  */
@@ -149,6 +150,10 @@ main(int argc, char *argv[])
 		if(strcmp(goos, "darwin") == 0)
 			HEADTYPE = 6;
 		else
+		if(strcmp(goos, "freebsd") == 0) {
+			debug['d'] = 1;	/* no dynamic syms for now */
+			HEADTYPE = 9;
+		} else
 			print("goos is not known: %s\n", goos);
 	}
 
@@ -194,6 +199,7 @@ main(int argc, char *argv[])
 			INITDAT = 0;
 		break;
 	case 7:	/* elf64 executable */
+	case 9: /* freebsd */
 		elfinit();
 		HEADR = ELFRESERVE;
 		if(INITTEXT == -1)
diff --git a/src/cmd/cov/Makefile b/src/cmd/cov/Makefile
index 2d849c6b8a..293ff399a5 100644
--- a/src/cmd/cov/Makefile
+++ b/src/cmd/cov/Makefile
@@ -24,6 +24,7 @@ clean:
 
 install: install-$(shell uname | tr A-Z a-z)
 install-linux: install-default
+install-freebsd: install-default
 
 # on Darwin, have to install and setgid; see $GOROOT/src/sudo.bash
 install-darwin: $(TARG)
diff --git a/src/cmd/prof/Makefile b/src/cmd/prof/Makefile
index 7ebc19d63f..f9012577ee 100644
--- a/src/cmd/prof/Makefile
+++ b/src/cmd/prof/Makefile
@@ -24,6 +24,7 @@ clean:
 
 install: install-$(shell uname | tr A-Z a-z)
 install-linux: install-default
+install-freebsd: install-default
 
 # on Darwin, have to install and setgid; see $GOROOT/src/sudo.bash
 install-darwin: $(TARG)