Add support for RISC-V architecture.

Reviewed by:	andrew, kib
Sponsored by:	DARPA, AFRL
Sponsored by:	HEIF5
Differential Revision:	https://reviews.freebsd.org/D4679

4 files changed, 641 insertions, 1 deletions

diff --git a/libexec/rtld-elf/riscv/reloc.c b/libexec/rtld-elf/riscv/reloc.c
new file mode 100644
index 000000000000..c43800a9407d
--- /dev/null
+++ b/libexec/rtld-elf/riscv/reloc.c
@@ -0,0 +1,400 @@
+/*-
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * This software was developed by the University of Cambridge Computer
+ * Laboratory as part of the CTSRD Project, with support from the UK Higher
+ * Education Innovation Fund (HEIF).
+ *
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#include "debug.h"
+#include "rtld.h"
+#include "rtld_printf.h"
+
+/*
+ * It is possible for the compiler to emit relocations for unaligned data.
+ * We handle this situation with these inlines.
+ */
+#define	RELOC_ALIGNED_P(x) \
+	(((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
+
+void _exit(int);
+
+uint64_t
+set_gp(Obj_Entry *obj)
+{
+	uint64_t old;
+	SymLook req;
+	uint64_t gp;
+	int res;
+
+	__asm __volatile("mv    %0, gp" : "=r"(old));
+
+	symlook_init(&req, "_gp");
+	req.ventry = NULL;
+	req.flags = SYMLOOK_EARLY;
+	res = symlook_obj(&req, obj);
+
+	if (res == 0) {
+		gp = req.sym_out->st_value;
+		__asm __volatile("mv    gp, %0" :: "r"(gp));
+	}
+
+	return (old);
+}
+
+void
+init_pltgot(Obj_Entry *obj)
+{
+
+	if (obj->pltgot != NULL) {
+		obj->pltgot[0] = (Elf_Addr)&_rtld_bind_start;
+		obj->pltgot[1] = (Elf_Addr)obj;
+	}
+}
+
+int
+do_copy_relocations(Obj_Entry *dstobj)
+{
+	const Obj_Entry *srcobj, *defobj;
+	const Elf_Rela *relalim;
+	const Elf_Rela *rela;
+	const Elf_Sym *srcsym;
+	const Elf_Sym *dstsym;
+	const void *srcaddr;
+	const char *name;
+	void *dstaddr;
+	SymLook req;
+	size_t size;
+	int res;
+
+	/*
+	 * COPY relocs are invalid outside of the main program
+	 */
+	assert(dstobj->mainprog);
+
+	relalim = (const Elf_Rela *)((char *)dstobj->rela +
+	    dstobj->relasize);
+	for (rela = dstobj->rela; rela < relalim; rela++) {
+		if (ELF_R_TYPE(rela->r_info) != R_RISCV_COPY)
+			continue;
+
+		dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
+		dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
+		name = dstobj->strtab + dstsym->st_name;
+		size = dstsym->st_size;
+
+		symlook_init(&req, name);
+		req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info));
+		req.flags = SYMLOOK_EARLY;
+
+		for (srcobj = dstobj->next; srcobj != NULL;
+		     srcobj = srcobj->next) {
+			res = symlook_obj(&req, srcobj);
+			if (res == 0) {
+				srcsym = req.sym_out;
+				defobj = req.defobj_out;
+				break;
+			}
+		}
+		if (srcobj == NULL) {
+			_rtld_error(
+"Undefined symbol \"%s\" referenced from COPY relocation in %s",
+			    name, dstobj->path);
+			return (-1);
+		}
+
+		srcaddr = (const void *)(defobj->relocbase + srcsym->st_value);
+		memcpy(dstaddr, srcaddr, size);
+	}
+
+	return (0);
+}
+
+/*
+ * Process the PLT relocations.
+ */
+int
+reloc_plt(Obj_Entry *obj)
+{
+	const Elf_Rela *relalim;
+	const Elf_Rela *rela;
+
+	relalim = (const Elf_Rela *)((char *)obj->pltrela + obj->pltrelasize);
+	for (rela = obj->pltrela; rela < relalim; rela++) {
+		Elf_Addr *where;
+
+		assert(ELF_R_TYPE(rela->r_info) == R_RISCV_JUMP_SLOT);
+
+		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
+		*where += (Elf_Addr)obj->relocbase;
+	}
+
+	return (0);
+}
+
+/*
+ * LD_BIND_NOW was set - force relocation for all jump slots
+ */
+int
+reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
+{
+	const Obj_Entry *defobj;
+	const Elf_Rela *relalim;
+	const Elf_Rela *rela;
+	const Elf_Sym *def;
+
+	relalim = (const Elf_Rela *)((char *)obj->pltrela + obj->pltrelasize);
+	for (rela = obj->pltrela; rela < relalim; rela++) {
+		Elf_Addr *where;
+
+		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
+		switch(ELF_R_TYPE(rela->r_info)) {
+		case R_RISCV_JUMP_SLOT:
+			def = find_symdef(ELF_R_SYM(rela->r_info), obj,
+			    &defobj, SYMLOOK_IN_PLT | flags, NULL, lockstate);
+			if (def == NULL) {
+				dbg("reloc_jmpslots: sym not found");
+				return (-1);
+			}
+
+			*where = (Elf_Addr)(defobj->relocbase + def->st_value);
+			break;
+		default:
+			_rtld_error("Unknown relocation type %x in jmpslot",
+			    (unsigned int)ELF_R_TYPE(rela->r_info));
+			return (-1);
+		}
+	}
+
+	return (0);
+}
+
+int
+reloc_iresolve(Obj_Entry *obj, struct Struct_RtldLockState *lockstate)
+{
+
+	/* XXX not implemented */
+	return (0);
+}
+
+int
+reloc_gnu_ifunc(Obj_Entry *obj, int flags,
+   struct Struct_RtldLockState *lockstate)
+{
+
+	/* XXX not implemented */
+	return (0);
+}
+
+Elf_Addr
+reloc_jmpslot(Elf_Addr *where, Elf_Addr target, const Obj_Entry *defobj,
+    const Obj_Entry *obj, const Elf_Rel *rel)
+{
+
+	assert(ELF_R_TYPE(rel->r_info) == R_RISCV_JUMP_SLOT);
+
+	if (*where != target)
+		*where = target;
+
+	return target;
+}
+
+/*
+ * Process non-PLT relocations
+ */
+int
+reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
+    RtldLockState *lockstate)
+{
+	const Obj_Entry *defobj;
+	const Elf_Rela *relalim;
+	const Elf_Rela *rela;
+	const Elf_Sym *def;
+	SymCache *cache;
+	Elf_Addr *where;
+	unsigned long symnum;
+
+	if ((flags & SYMLOOK_IFUNC) != 0)
+		/* XXX not implemented */
+		return (0);
+
+	/*
+	 * The dynamic loader may be called from a thread, we have
+	 * limited amounts of stack available so we cannot use alloca().
+	 */
+	if (obj == obj_rtld)
+		cache = NULL;
+	else
+		cache = calloc(obj->dynsymcount, sizeof(SymCache));
+		/* No need to check for NULL here */
+
+	relalim = (const Elf_Rela *)((caddr_t)obj->rela + obj->relasize);
+	for (rela = obj->rela; rela < relalim; rela++) {
+		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
+		symnum = ELF_R_SYM(rela->r_info);
+
+		switch (ELF_R_TYPE(rela->r_info)) {
+		case R_RISCV_JUMP_SLOT:
+			/* This will be handled by the plt/jmpslot routines */
+			break;
+		case R_RISCV_NONE:
+			break;
+		case R_RISCV_64:
+			def = find_symdef(symnum, obj, &defobj, flags, cache,
+			    lockstate);
+			if (def == NULL)
+				return (-1);
+
+			*where = (Elf_Addr)(defobj->relocbase + def->st_value +
+			    rela->r_addend);
+			break;
+		case R_RISCV_TLS_DTPMOD64:
+			def = find_symdef(symnum, obj, &defobj, flags, cache,
+			    lockstate);
+			if (def == NULL)
+				return -1;
+
+			*where += (Elf_Addr)defobj->tlsindex;
+			break;
+		case R_RISCV_COPY:
+			/*
+			 * These are deferred until all other relocations have
+			 * been done. All we do here is make sure that the
+			 * COPY relocation is not in a shared library. They
+			 * are allowed only in executable files.
+			 */
+			if (!obj->mainprog) {
+				_rtld_error("%s: Unexpected R_RISCV_COPY "
+				    "relocation in shared library", obj->path);
+				return (-1);
+			}
+			break;
+		case R_RISCV_TLS_DTPREL64:
+			def = find_symdef(symnum, obj, &defobj, flags, cache,
+			    lockstate);
+			if (def == NULL)
+				return (-1);
+			/*
+			 * We lazily allocate offsets for static TLS as we
+			 * see the first relocation that references the
+			 * TLS block. This allows us to support (small
+			 * amounts of) static TLS in dynamically loaded
+			 * modules. If we run out of space, we generate an
+			 * error.
+			 */
+			if (!defobj->tls_done) {
+				if (!allocate_tls_offset((Obj_Entry*) defobj)) {
+					_rtld_error(
+					    "%s: No space available for static "
+					    "Thread Local Storage", obj->path);
+					return (-1);
+				}
+			}
+
+			*where += (Elf_Addr)(def->st_value + rela->r_addend
+			    - TLS_DTV_OFFSET);
+			break;
+		case R_RISCV_TLS_TPREL64:
+			def = find_symdef(symnum, obj, &defobj, flags, cache,
+			    lockstate);
+			if (def == NULL)
+				return (-1);
+
+			/*
+			 * We lazily allocate offsets for static TLS as we
+			 * see the first relocation that references the
+			 * TLS block. This allows us to support (small
+			 * amounts of) static TLS in dynamically loaded
+			 * modules. If we run out of space, we generate an
+			 * error.
+			 */
+			if (!defobj->tls_done) {
+				if (!allocate_tls_offset((Obj_Entry*) defobj)) {
+					_rtld_error(
+					    "%s: No space available for static "
+					    "Thread Local Storage", obj->path);
+					return (-1);
+				}
+			}
+
+			*where = (def->st_value + rela->r_addend +
+			    defobj->tlsoffset - TLS_TP_OFFSET);
+			break;
+		case R_RISCV_RELATIVE:
+			*where = (Elf_Addr)(obj->relocbase + rela->r_addend);
+			break;
+		default:
+			rtld_printf("%s: Unhandled relocation %lu\n",
+			    obj->path, ELF_R_TYPE(rela->r_info));
+			return (-1);
+		}
+	}
+
+	return (0);
+}
+
+void
+allocate_initial_tls(Obj_Entry *objs)
+{
+	Elf_Addr **tp;
+
+	/*
+	 * Fix the size of the static TLS block by using the maximum
+	 * offset allocated so far and adding a bit for dynamic modules to
+	 * use.
+	 */
+	tls_static_space = tls_last_offset + tls_last_size +
+	    RTLD_STATIC_TLS_EXTRA;
+
+	tp = (Elf_Addr **) ((char *)allocate_tls(objs, NULL, TLS_TCB_SIZE, 16)
+	    + TLS_TP_OFFSET + TLS_TCB_SIZE);
+
+	__asm __volatile("mv  tp, %0" :: "r"(tp));
+}
+
+void *
+__tls_get_addr(tls_index* ti)
+{
+	char *_tp;
+	void *p;
+
+	__asm __volatile("mv %0, tp" : "=r" (_tp));
+
+	p = tls_get_addr_common((Elf_Addr**)((Elf_Addr)_tp - TLS_TP_OFFSET
+	    - TLS_TCB_SIZE), ti->ti_module, ti->ti_offset);
+
+	return (p + TLS_DTV_OFFSET);
+}
diff --git a/libexec/rtld-elf/riscv/rtld_machdep.h b/libexec/rtld-elf/riscv/rtld_machdep.h
new file mode 100644
index 000000000000..aa370001b5cb
--- /dev/null
+++ b/libexec/rtld-elf/riscv/rtld_machdep.h
@@ -0,0 +1,111 @@
+/*-
+ * Copyright (c) 1999, 2000 John D. Polstra.
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by SRI International and the
+ * University of Cambridge Computer Laboratory under DARPA/AFRL contract
+ * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Portions of this software were developed by the University of Cambridge
+ * Computer Laboratory as part of the CTSRD Project, with support from the
+ * UK Higher Education Innovation Fund (HEIF).
+ *
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef RTLD_MACHDEP_H
+#define RTLD_MACHDEP_H	1
+
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+struct Struct_Obj_Entry;
+
+uint64_t set_gp(struct Struct_Obj_Entry *obj);
+
+/* Return the address of the .dynamic section in the dynamic linker. */
+#define rtld_dynamic(obj)                                               \
+({                                                                      \
+	Elf_Addr _dynamic_addr;                                         \
+	__asm __volatile("lla       %0, _DYNAMIC" : "=r"(_dynamic_addr));   \
+	(const Elf_Dyn *)_dynamic_addr;                                 \
+})
+#define RTLD_IS_DYNAMIC() (1)
+
+Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
+		       const struct Struct_Obj_Entry *defobj,
+		       const struct Struct_Obj_Entry *obj,
+		       const Elf_Rel *rel);
+
+#define make_function_pointer(def, defobj) \
+	((defobj)->relocbase + (def)->st_value)
+
+#define call_initfini_pointer(obj, target)				\
+({									\
+	uint64_t old0;							\
+	old0 = set_gp(obj);						\
+	(((InitFunc)(target))());					\
+	__asm __volatile("mv    gp, %0" :: "r"(old0));			\
+})
+
+#define call_init_pointer(obj, target)					\
+({									\
+	uint64_t old1;							\
+	old1 = set_gp(obj);						\
+	(((InitArrFunc)(target))(main_argc, main_argv, environ));	\
+	__asm __volatile("mv    gp, %0" :: "r"(old1));			\
+})
+
+/*
+ * Lazy binding entry point, called via PLT.
+ */
+void _rtld_bind_start(void);
+
+/*
+ * TLS
+ */
+#define	TLS_TP_OFFSET	0x0
+#define	TLS_DTV_OFFSET	0x800
+#define	TLS_TCB_SIZE	16
+
+#define round(size, align) \
+    (((size) + (align) - 1) & ~((align) - 1))
+#define calculate_first_tls_offset(size, align) \
+    round(16, align)
+#define calculate_tls_offset(prev_offset, prev_size, size, align) \
+    round(prev_offset + prev_size, align)
+#define calculate_tls_end(off, size)    ((off) + (size))
+
+typedef struct {
+	unsigned long ti_module;
+	unsigned long ti_offset;
+} tls_index;
+
+extern void *__tls_get_addr(tls_index* ti);
+
+#define	RTLD_DEFAULT_STACK_PF_EXEC	PF_X
+#define	RTLD_DEFAULT_STACK_EXEC		PROT_EXEC
+
+#endif
diff --git a/libexec/rtld-elf/riscv/rtld_start.S b/libexec/rtld-elf/riscv/rtld_start.S
new file mode 100644
index 000000000000..76b6dfcaf3bc
--- /dev/null
+++ b/libexec/rtld-elf/riscv/rtld_start.S
@@ -0,0 +1,129 @@
+/*-
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * This software was developed by the University of Cambridge Computer
+ * Laboratory as part of the CTSRD Project, with support from the UK Higher
+ * Education Innovation Fund (HEIF).
+ *
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * func_ptr_type
+ * _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
+ */
+
+ENTRY(.rtld_start)
+	mv	s0, a0		/* Put ps_strings in a callee-saved register */
+	mv	s1, sp		/* And the stack pointer */
+
+	addi	sp, sp, -16	/* Make room for obj_main & exit proc */
+
+	mv	a1, sp		/* exit_proc */
+	addi	a2, a1, 8	/* obj_main */
+	jal	_rtld		/* Call the loader */
+	mv	t0, a0		/* Backup the entry point */
+
+	ld	a2, 0(sp)	/* Load cleanup */
+	ld	a1, 8(sp)	/* Load obj_main */
+	mv	a0, s0		/* Restore ps_strings */
+	mv	sp, s1		/* Restore the stack pointer */
+	jr	t0		/* Jump to the entry point */
+END(.rtld_start)
+
+/*
+ * t0 = obj pointer
+ * t1 = reloc offset
+ */
+ENTRY(_rtld_bind_start)
+	/* Save the arguments and ra */
+	addi	sp, sp, -(8 * 25)
+	sd	a0, (8 * 0)(sp)
+	sd	a1, (8 * 1)(sp)
+	sd	a2, (8 * 2)(sp)
+	sd	a3, (8 * 3)(sp)
+	sd	a4, (8 * 4)(sp)
+	sd	a5, (8 * 5)(sp)
+	sd	a6, (8 * 6)(sp)
+	sd	a7, (8 * 7)(sp)
+	sd	ra, (8 * 8)(sp)
+#if 0
+	/* RISCVTODO VFP */
+	/* Save any floating-point arguments */
+	fsq	fa0, (8 * 9)(sp)
+	fsq	fa1, (8 * 11)(sp)
+	fsq	fa2, (8 * 13)(sp)
+	fsq	fa3, (8 * 15)(sp)
+	fsq	fa4, (8 * 17)(sp)
+	fsq	fa5, (8 * 19)(sp)
+	fsq	fa6, (8 * 21)(sp)
+	fsq	fa7, (8 * 23)(sp)
+#endif
+
+	/* Reloc offset is 3x of the .got.plt offset */
+	slli	a1, t1, 1	/* Mult items by 2 */
+	add	a1, a1, t1	/* Plus item */
+
+	/* Load obj */
+	mv	a0, t0
+
+	/* Call into rtld */
+	jal	_rtld_bind
+
+	/* Backup the address to branch to */
+	mv	t0, a0
+
+	/* Restore the arguments and ra */
+	ld	a0, (8 * 0)(sp)
+	ld	a1, (8 * 1)(sp)
+	ld	a2, (8 * 2)(sp)
+	ld	a3, (8 * 3)(sp)
+	ld	a4, (8 * 4)(sp)
+	ld	a5, (8 * 5)(sp)
+	ld	a6, (8 * 6)(sp)
+	ld	a7, (8 * 7)(sp)
+	ld	ra, (8 * 8)(sp)
+#if 0
+	/* RISCVTODO VFP */
+	/* Restore floating-point arguments */
+	flq	fa0, (8 * 9)(sp)
+	flq	fa1, (8 * 11)(sp)
+	flq	fa2, (8 * 13)(sp)
+	flq	fa3, (8 * 15)(sp)
+	flq	fa4, (8 * 17)(sp)
+	flq	fa5, (8 * 19)(sp)
+	flq	fa6, (8 * 21)(sp)
+	flq	fa7, (8 * 23)(sp)
+#endif
+	addi	sp, sp, (8 * 25)
+
+	/* Call into the correct function */
+	jr	t0
+END(_rtld_bind_start)
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index 0e8b78835308..1a8263ff4d67 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -4396,7 +4396,7 @@ tls_get_addr_common(Elf_Addr **dtvp, int index, size_t offset)
 }
 
 #if defined(__aarch64__) || defined(__arm__) || defined(__mips__) || \
-    defined(__powerpc__)
+    defined(__powerpc__) || defined(__riscv__)
 
 /*
  * Allocate Static TLS using the Variant I method.