FreeBSD/mips port. The FreeBSD/mips port targets mips32, mips64,

mips32r2 and mips64r2 (and close relatives) processors.  There
presently is support for ADMtek ADM5120, A mips 4Kc in a malta board,
the RB533 routerboard (based on IDT RC32434) and some preliminary
support for sibtye/broadcom designs.  Other hardware support will be
forthcomcing.

This port boots multiuser under gxemul emulating the malta board and
also bootstraps on the hardware whose support is forthcoming...

Oleksandr Tymoshenko, Wojciech Koszek, Warner Losh, Olivier Houchard,
Randall Stewert and others that have contributed to the mips2 and/or
mips2-jnpr perforce branches.  Juniper contirbuted a generic mips port
late in the life cycle of the misp2 branch.  Warner Losh merged the
mips2 and Juniper code bases, and others list above have worked for
the past several months to get to multiuser.

In addition, the mips2 work owe a debt to the trail blazing efforts of
the original mips branch in perforce done by Juli Mallett.

1 files changed, 268 insertions, 0 deletions

diff --git a/sys/mips/mips/elf_machdep.c b/sys/mips/mips/elf_machdep.c
new file mode 100644
index 0000000..4a062bd
--- /dev/null
+++ b/sys/mips/mips/elf_machdep.c
@@ -0,0 +1,268 @@
+/*-
+ * Copyright 1996-1998 John D. Polstra.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/exec.h>
+#include <sys/imgact.h>
+#include <sys/linker.h>
+#include <sys/sysent.h>
+#include <sys/imgact_elf.h>
+#include <sys/syscall.h>
+#include <sys/signalvar.h>
+#include <sys/vnode.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_param.h>
+
+#include <machine/elf.h>
+#include <machine/md_var.h>
+
+struct sysentvec elf32_freebsd_sysvec = {
+	SYS_MAXSYSCALL,
+	sysent,
+	0,
+	0,
+	NULL,
+	0,
+	NULL,
+	NULL,
+	__elfN(freebsd_fixup),
+	sendsig,
+	sigcode,
+	&szsigcode,
+	NULL,
+	"FreeBSD ELF32",
+	__elfN(coredump),
+	NULL,
+	MINSIGSTKSZ,
+	PAGE_SIZE,
+	VM_MIN_ADDRESS,
+	VM_MAXUSER_ADDRESS,
+	USRSTACK,
+	PS_STRINGS,
+	VM_PROT_ALL,
+	exec_copyout_strings,
+	exec_setregs,
+	NULL
+};
+
+static Elf32_Brandinfo freebsd_brand_info = {
+						ELFOSABI_FREEBSD,
+						EM_MIPS,
+						"FreeBSD",
+						NULL,
+						"/libexec/ld-elf.so.1",
+						&elf32_freebsd_sysvec,
+						NULL,
+					  };
+
+SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
+	(sysinit_cfunc_t) elf32_insert_brand_entry,
+	&freebsd_brand_info);
+
+static Elf32_Brandinfo freebsd_brand_oinfo = {
+						ELFOSABI_FREEBSD,
+						EM_MIPS,
+						"FreeBSD",
+						NULL,
+						"/usr/libexec/ld-elf.so.1",
+						&elf32_freebsd_sysvec,
+						NULL,
+					  };
+
+SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
+	(sysinit_cfunc_t) elf32_insert_brand_entry,
+	&freebsd_brand_oinfo);
+
+
+void
+elf32_dump_thread(struct thread *td __unused, void *dst __unused,
+    size_t *off __unused)
+{
+}
+
+/* Process one elf relocation with addend. */
+static int
+elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
+    int type, int local, elf_lookup_fn lookup)
+{
+	Elf_Addr *where = (Elf_Addr *)NULL;;
+	Elf_Addr addr;
+	Elf_Addr addend = (Elf_Addr)0;
+	Elf_Word rtype = (Elf_Word)0, symidx;
+	const Elf_Rel *rel;
+	const Elf_Rela *rela;
+
+	switch (type) {
+	case ELF_RELOC_REL:
+		rel = (const Elf_Rel *)data;
+		where = (Elf_Addr *) (relocbase + rel->r_offset);
+		addend = *where;
+		rtype = ELF_R_TYPE(rel->r_info);
+		symidx = ELF_R_SYM(rel->r_info);
+		break;
+	case ELF_RELOC_RELA:
+		rela = (const Elf_Rela *)data;
+		where = (Elf_Addr *) (relocbase + rela->r_offset);
+		addend = rela->r_addend;
+		rtype = ELF_R_TYPE(rela->r_info);
+		symidx = ELF_R_SYM(rela->r_info);
+		break;
+	default:
+		panic("unknown reloc type %d\n", type);
+	}
+
+	if (local) {
+#if 0 /* TBD  */
+		if (rtype == R_386_RELATIVE) {	/* A + B */
+			addr = relocbase + addend;
+			if (*where != addr)
+				*where = addr;
+		}
+		return (0);
+#endif
+	}
+
+	switch (rtype) {
+
+		case R_MIPS_NONE:	/* none */
+			break;
+
+		case R_MIPS_16:	    /* S + sign-extend(A) */
+			/*
+			 * There shouldn't be R_MIPS_16 relocs in kernel objects.
+			 */
+			printf("kldload: unexpected R_MIPS_16 relocation\n");
+			return -1;
+			break;
+
+		case R_MIPS_32: /* S + A - P */
+			addr = lookup(lf, symidx, 1);
+			if (addr == 0)
+				return -1;
+			addr += addend;
+			if (*where != addr)
+				*where = addr;
+			break;
+
+		case R_MIPS_REL32:		/* A - EA + S */
+			/*
+			 * There shouldn't be R_MIPS_REL32 relocs in kernel objects?
+			 */
+			printf("kldload: unexpected R_MIPS_REL32 relocation\n");
+			return -1;
+			break;
+
+		case R_MIPS_26:	     /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
+			break;
+
+		case R_MIPS_HI16:
+			/* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */
+			/* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */
+			break;
+
+		case R_MIPS_LO16:
+			/* extern/local: AHL + S */
+			/* _gp_disp: AHL + GP - P + 4 */
+			break;
+
+		case R_MIPS_GPREL16:
+			/* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */
+			/* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */
+			break;
+
+		case R_MIPS_LITERAL: /* sign-extend(A) + L */
+			break;
+
+		case R_MIPS_GOT16: /* external: G */
+			/* local: tbd */
+			break;
+
+		case R_MIPS_PC16: /* sign-extend(A) + S - P */
+			break;
+
+		case R_MIPS_CALL16: /* G */
+			break;
+
+		case R_MIPS_GPREL32: /* A + S + GP0 - GP */
+			break;
+
+		case R_MIPS_GOTHI16: /* (G - (short)G) >> 16 + A */
+			break;
+
+		case R_MIPS_GOTLO16: /* G & 0xffff */
+			break;
+
+		case R_MIPS_CALLHI16: /* (G - (short)G) >> 16 + A */
+			break;
+
+		case R_MIPS_CALLLO16: /* G & 0xffff */
+			break;
+
+		default:
+			printf("kldload: unexpected relocation type %d\n",
+			    rtype);
+			return (-1);
+	}
+	return(0);
+}
+
+int
+elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
+    elf_lookup_fn lookup)
+{
+
+	return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
+}
+
+int
+elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
+    int type, elf_lookup_fn lookup)
+{
+
+	return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
+}
+
+int
+elf_cpu_load_file(linker_file_t lf __unused)
+{
+
+	return (0);
+}
+
+int
+elf_cpu_unload_file(linker_file_t lf __unused)
+{
+
+	return (0);
+}