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authormatt <matt@NetBSD.org>2014-09-19 17:36:24 +0000
committermatt <matt@NetBSD.org>2014-09-19 17:36:24 +0000
commit25195b1e580593d7db7375fb8a883f3cb9df3cce (patch)
treeebf58bf7ac2dda20ebb4d45153ec831dc590c76d /libexec
parent2a9c01cfd73c186ddd2af4732708c88047ffdc1a (diff)
New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)
Diffstat (limited to 'libexec')
-rw-r--r--libexec/ld.elf_so/arch/riscv/Makefile.inc15
-rw-r--r--libexec/ld.elf_so/arch/riscv/mdreloc.c370
-rw-r--r--libexec/ld.elf_so/arch/riscv/rtld_start.S114
3 files changed, 499 insertions, 0 deletions
diff --git a/libexec/ld.elf_so/arch/riscv/Makefile.inc b/libexec/ld.elf_so/arch/riscv/Makefile.inc
new file mode 100644
index 00000000000..74064faecd1
--- /dev/null
+++ b/libexec/ld.elf_so/arch/riscv/Makefile.inc
@@ -0,0 +1,15 @@
+# $NetBSD: Makefile.inc,v 1.1 2014/09/19 17:36:25 matt Exp $
+
+SRCS+= rtld_start.S mdreloc.c
+
+# XXX Should not be in CPPFLAGS!
+CPPFLAGS+= -fpic
+
+.if ${LDELFSO_MACHINE_ARCH} == "riscv64"
+CPPFLAGS+= -DELFSIZE=64
+.else
+CPPFLAGS+= -DELFSIZE=32
+.endif
+CPPFLAGS+= -DHAVE_INITFINI_ARRAY
+
+LDFLAGS+= -Wl,-e,_rtld_start
diff --git a/libexec/ld.elf_so/arch/riscv/mdreloc.c b/libexec/ld.elf_so/arch/riscv/mdreloc.c
new file mode 100644
index 00000000000..559905aa0e0
--- /dev/null
+++ b/libexec/ld.elf_so/arch/riscv/mdreloc.c
@@ -0,0 +1,370 @@
+/* $NetBSD: mdreloc.c,v 1.1 2014/09/19 17:36:25 matt Exp $ */
+
+/*-
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
+#ifndef lint
+__RCSID("$NetBSD: mdreloc.c,v 1.1 2014/09/19 17:36:25 matt Exp $");
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/endian.h>
+#include <sys/tls.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "debug.h"
+#include "rtld.h"
+
+void _rtld_bind_start(void);
+void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
+void *_rtld_bind(const Obj_Entry *, Elf_Word);
+
+#if ELFSIZE == 64
+#define Elf_Sxword Elf64_Sxword
+#else
+#define Elf_Sxword Elf32_Sword
+#endif
+
+void
+_rtld_setup_pltgot(const Obj_Entry *obj)
+{
+ obj->pltgot[0] = (Elf_Addr) &_rtld_bind_start;
+ obj->pltgot[1] = (Elf_Addr) obj;
+}
+
+void
+_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
+{
+ const Elf_Rel *rel = 0, *rellim;
+ Elf_Addr relsz = 0;
+ Elf_Sxword *where;
+ const Elf_Sym *symtab = NULL, *sym;
+ Elf_Addr *got = NULL;
+ Elf_Word local_gotno = 0, symtabno = 0, gotsym = 0;
+ size_t i;
+
+ for (; dynp->d_tag != DT_NULL; dynp++) {
+ switch (dynp->d_tag) {
+ case DT_REL:
+ rel = (const Elf_Rel *)(relocbase + dynp->d_un.d_ptr);
+ break;
+ case DT_RELSZ:
+ relsz = dynp->d_un.d_val;
+ break;
+ case DT_SYMTAB:
+ symtab = (const Elf_Sym *)(relocbase + dynp->d_un.d_ptr);
+ break;
+ case DT_PLTGOT:
+ got = (Elf_Addr *)(relocbase + dynp->d_un.d_ptr);
+ break;
+ case DT_RISCV_LOCAL_GOTNO:
+ local_gotno = dynp->d_un.d_val;
+ break;
+ case DT_RISCV_SYMTABNO:
+ symtabno = dynp->d_un.d_val;
+ break;
+ case DT_RISCV_GOTSYM:
+ gotsym = dynp->d_un.d_val;
+ break;
+ }
+ }
+
+ i = (got[1] & 0x80000000) ? 2 : 1;
+ /* Relocate the local GOT entries */
+ got += i;
+ for (; i < local_gotno; i++)
+ *got++ += relocbase;
+ sym = symtab + gotsym;
+ /* Now do the global GOT entries */
+ for (i = gotsym; i < symtabno; i++) {
+ *got = sym->st_value + relocbase;
+ ++sym;
+ ++got;
+ }
+
+ rellim = (const Elf_Rel *)((uintptr_t)rel + relsz);
+ for (; rel < rellim; rel++) {
+ Elf_Word r_symndx, r_type;
+
+ where = (Elf_Sxword *)(relocbase + rel->r_offset);
+
+ r_symndx = ELF_R_SYM(rel->r_info);
+ r_type = ELF_R_TYPE(rel->r_info);
+
+ switch (r_type & 0xff) {
+ case R_TYPE(REL32): {
+ Elf_Sxword old = *where;
+ Elf_Sxword val = old;
+#if ELFSIZE == 64
+ assert(r_type == R_TYPE(REL32)
+ || r_type == (R_TYPE(REL32)|(R_TYPE(64) << 8)));
+#endif
+ assert(r_symndx < gotsym);
+ sym = symtab + r_symndx;
+ assert(ELF_ST_BIND(sym->st_info) == STB_LOCAL);
+ val += relocbase;
+ *(Elf_Sword *)where = val;
+ rdbg(("REL32/L(%p) %p -> %p in <self>",
+ where, (void *)old, (void *)val));
+ break;
+ }
+
+ case R_TYPE(NONE):
+ break;
+
+ default:
+ abort();
+ }
+ }
+}
+
+int
+_rtld_relocate_nonplt_objects(Obj_Entry *obj)
+{
+ const Elf_Rel *rel;
+ Elf_Addr *got = obj->pltgot;
+ const Elf_Sym *sym, *def;
+ const Obj_Entry *defobj;
+ Elf_Word i;
+
+ i = 2;
+ /* Relocate the local GOT entries */
+ got += i;
+ for (; i < obj->local_gotno; i++)
+ *got++ += (Elf_Addr)obj->relocbase;
+
+ sym = obj->symtab + obj->gotsym;
+ /* Now do the global GOT entries */
+ for (i = obj->gotsym; i < obj->symtabno; i++) {
+ rdbg((" doing got %d sym %p (%s, %lx)", i - obj->gotsym, sym,
+ sym->st_name + obj->strtab, (u_long) *got));
+
+ if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
+ sym->st_value != 0 && sym->st_shndx == SHN_UNDEF) {
+ /*
+ * If there are non-PLT references to the function,
+ * st_value should be 0, forcing us to resolve the
+ * address immediately.
+ *
+ * XXX DANGER WILL ROBINSON!
+ * The linker is not outputting PLT slots for calls to
+ * functions that are defined in the same shared
+ * library. This is a bug, because it can screw up
+ * link ordering rules if the symbol is defined in
+ * more than one module. For now, if there is a
+ * definition, we fail the test above and force a full
+ * symbol lookup. This means that all intra-module
+ * calls are bound immediately. - mycroft, 2003/09/24
+ */
+ *got = sym->st_value + (Elf_Addr)obj->relocbase;
+ } else if (sym->st_info == ELF_ST_INFO(STB_GLOBAL, STT_SECTION)) {
+ /* Symbols with index SHN_ABS are not relocated. */
+ if (sym->st_shndx != SHN_ABS)
+ *got = sym->st_value +
+ (Elf_Addr)obj->relocbase;
+ } else {
+ def = _rtld_find_symdef(i, obj, &defobj, false);
+ if (def == NULL)
+ return -1;
+ *got = def->st_value + (Elf_Addr)defobj->relocbase;
+ }
+
+ rdbg((" --> now %lx", (u_long) *got));
+ ++sym;
+ ++got;
+ }
+
+ got = obj->pltgot;
+ for (rel = obj->rel; rel < obj->rellim; rel++) {
+ Elf_Addr * const where =
+ (Elf_Addr *)(obj->relocbase + rel->r_offset);
+ const Elf_Word r_symndx = ELF_R_SYM(rel->r_info);
+ const Elf_Word r_type = ELF_R_TYPE(rel->r_info);
+
+ switch (r_type) {
+ case R_TYPE(NONE):
+ break;
+
+ case R_TYPE(REL32): {
+ /* 32-bit PC-relative reference */
+ Elf_Sxword old = *where;
+ Elf_Sxword val = old;
+
+ def = obj->symtab + r_symndx;
+
+ if (r_symndx < obj->gotsym) {
+ val += (Elf_Addr)obj->relocbase;
+
+ rdbg(("REL32/L(%p) %p -> %p (%s) in %s",
+ where, (void *)old, (void *)val,
+ obj->strtab + def->st_name, obj->path));
+ } else {
+ val += got[obj->local_gotno + r_symndx - obj->gotsym];
+ rdbg(("REL32/G(%p) %p --> %p (%s) in %s",
+ where, (void *)old, (void *)val,
+ obj->strtab + def->st_name,
+ obj->path));
+ }
+ *where = val;
+ break;
+ }
+
+#if ELFSIZE == 64
+ case R_TYPE(TLS_DTPMOD64):
+#else
+ case R_TYPE(TLS_DTPMOD32):
+#endif
+ {
+ Elf_Addr old = *where;
+ Elf_Addr val = old;
+
+ def = _rtld_find_symdef(r_symndx, obj, &defobj, false);
+ if (def == NULL)
+ return -1;
+
+ val += (Elf_Addr)defobj->tlsindex;
+
+ *where = val;
+ rdbg(("DTPMOD %s in %s --> %p in %s",
+ obj->strtab + obj->symtab[r_symndx].st_name,
+ obj->path, (void *)old, defobj->path));
+ break;
+ }
+
+#if ELFSIZE == 64
+ case R_TYPE(TLS_DTPREL64):
+#else
+ case R_TYPE(TLS_DTPREL32):
+#endif
+ {
+ Elf_Addr old = *where;
+ Elf_Addr val = old;
+
+ def = _rtld_find_symdef(r_symndx, obj, &defobj, false);
+ if (def == NULL)
+ return -1;
+
+ if (!defobj->tls_done && _rtld_tls_offset_allocate(obj))
+ return -1;
+
+ val += (Elf_Addr)def->st_value - TLS_DTV_OFFSET;
+ *(Elf_Word *) where = val;
+
+ rdbg(("DTPREL %s in %s --> %p in %s",
+ obj->strtab + obj->symtab[r_symndx].st_name,
+ obj->path, (void *)old, defobj->path));
+ break;
+ }
+
+ default:
+ rdbg(("sym = %lu, type = %lu, offset = %p, "
+ "contents = %p, symbol = %s",
+ (u_long)r_symndx, (u_long)ELF_R_TYPE(rel->r_info),
+ (void *)rel->r_offset,
+ (void *)load_ptr(where, sizeof(Elf_Sword)),
+ obj->strtab + obj->symtab[r_symndx].st_name));
+ _rtld_error("%s: Unsupported relocation type %ld "
+ "in non-PLT relocations",
+ obj->path, (u_long) ELF_R_TYPE(rel->r_info));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int
+_rtld_relocate_plt_lazy(const Obj_Entry *obj)
+{
+ /* PLT fixups were done above in the GOT relocation. */
+ return 0;
+}
+
+static int
+_rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rel *rel,
+ Elf_Addr *tp)
+{
+ const Obj_Entry *defobj;
+ Elf_Addr new_value;
+
+ assert(ELF_R_TYPE(rel->r_info) == R_TYPE(JMP_SLOT));
+
+ const Elf_Sym *def = _rtld_find_plt_symdef(ELF_R_SYM(rel->r_info),
+ obj, &defobj, tp != NULL);
+ if (__predict_false(def == NULL))
+ return -1;
+ if (__predict_false(def == &_rtld_sym_zero))
+ return -1;
+
+ if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
+ if (tp == NULL)
+ return 0;
+ new_value = _rtld_resolve_ifunc(defobj, def);
+ } else {
+ new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
+ }
+ rdbg(("bind now/fixup in %s --> new=%p",
+ defobj->strtab + def->st_name, (void *)new_value));
+ *(Elf_Addr *)(obj->relocbase + rel->r_offset) = new_value;
+
+ if (tp)
+ *tp = new_value;
+ return 0;
+}
+
+void *
+_rtld_bind(const Obj_Entry *obj, Elf_Word reloff)
+{
+ const Elf_Rel *pltrel = (const Elf_Rel *)(obj->pltrel + reloff);
+ Elf_Addr new_value;
+ int err;
+
+ _rtld_shared_enter();
+ err = _rtld_relocate_plt_object(obj, pltrel, &new_value);
+ if (err)
+ _rtld_die();
+ _rtld_shared_exit();
+
+ return (caddr_t)new_value;
+}
+
+int
+_rtld_relocate_plt_objects(const Obj_Entry *obj)
+{
+
+ for (const Elf_Rel *rel = obj->pltrel; rel < obj->pltrellim; rel++) {
+ if (_rtld_relocate_plt_object(obj, rel, NULL) < 0)
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/libexec/ld.elf_so/arch/riscv/rtld_start.S b/libexec/ld.elf_so/arch/riscv/rtld_start.S
new file mode 100644
index 00000000000..9760cdb459d
--- /dev/null
+++ b/libexec/ld.elf_so/arch/riscv/rtld_start.S
@@ -0,0 +1,114 @@
+/* $NetBSD: rtld_start.S,v 1.1 2014/09/19 17:36:25 matt Exp $ */
+
+/*-
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
+
+ .globl _C_LABEL(_rtld_relocate_nonplt_self)
+ .globl _C_LABEL(_rtld)
+
+/*
+ * void
+ * ___start(void (*cleanup)(void),
+ * const Obj_Entry *obj,
+ * struct ps_strings *ps_strings)
+ */
+ENTRY(_rtld_start)
+ move s0, sp # save stack pointer
+ addi sp, sp, -4*__SIZEOF_POINTER__
+ # adjust stack pointer
+ # -> 2*PTR_SIZE(sp) for atexit
+ # -> 3*PTR_SIZE(sp) for obj_main
+ move s1, a2 # save ps_strings pointer
+
+ auipc gp, %pcrel_hi(_GLOBAL_OFFSET_TABLE_)
+ PTR_L t0, %pcrel_lo(_GLOBAL_OFFSET_TABLE_)(gp) # &_DYNAMIC
+ auipc a0, %pcrel_hi(_DYNAMIC)
+ addi a0, a0, %pcrel_lo(_DYNAMIC)
+ sub s2, a0, t0 # save for _rtld
+ move a1, s2
+ call _C_LABEL(_rtld_relocate_nonplt_self)
+
+ move a1, s2 # relocbase
+ addi a0, sp, 2*__SIZEOF_POINTER__ # sp
+ call _C_LABEL(_rtld) # v0 = _rtld(sp, relocbase)
+
+ PTR_L a0, 2*__SIZEOF_POINTER__(sp) # cleanup function
+ PTR_L a1, 3*__SIZEOF_POINTER__(sp) # obj_main entry
+ move a2, s1 # restore ps_strings
+ move sp, s0 # readjust stack
+ move s0, zero # break stack chain
+ jr v0 # _start(cleanup, obj_main, ps_strings);
+END(_rtld_start)
+
+#define XCALLFRAME_SIZ (12*SZREG)
+#define XCALLFRAME_RA (8*SZREG)
+#define XCALLFRAME_A7 (7*SZREG)
+#define XCALLFRAME_A6 (6*SZREG)
+#define XCALLFRAME_A5 (5*SZREG)
+#define XCALLFRAME_A4 (4*SZREG)
+#define XCALLFRAME_A3 (3*SZREG)
+#define XCALLFRAME_A2 (2*SZREG)
+#define XCALLFRAME_A1 (1*SZREG)
+#define XCALLFRAME_A0 (0*SZREG)
+
+/*
+ * t0 = obj pointer
+ * t1 = reloc offset
+ */
+ENTRY_NP(_rtld_bind_start)
+ addi sp, sp, -XCALLFRAME_SIZ // save arguments on stack
+ REG_S a0, XCALLFRAME_A0(sp)
+ REG_S a1, XCALLFRAME_A1(sp)
+ REG_S a2, XCALLFRAME_A2(sp)
+ REG_S a3, XCALLFRAME_A3(sp)
+ REG_S a4, XCALLFRAME_A4(sp)
+ REG_S a5, XCALLFRAME_A5(sp)
+ REG_S a6, XCALLFRAME_A6(sp)
+ REG_S a7, XCALLFRAME_A7(sp)
+ REG_S ra, XCALLFRAME_RA(sp)
+
+ move a0, t0 /* object from got.plt[1] */
+ move a1, t1 /* reloc offset */
+
+ call _C_LABEL(_rtld_bind)
+
+ REG_L a0, XCALLFRAME_A0(sp)
+ REG_L a1, XCALLFRAME_A1(sp)
+ REG_L a2, XCALLFRAME_A2(sp)
+ REG_L a3, XCALLFRAME_A3(sp)
+ REG_L a4, XCALLFRAME_A4(sp)
+ REG_L a5, XCALLFRAME_A5(sp)
+ REG_L a6, XCALLFRAME_A6(sp)
+ REG_L a7, XCALLFRAME_A7(sp)
+ REG_L ra, XCALLFRAME_RA(sp)
+ addi sp, sp, XCALLFRAME_SIZ
+ jr v0
+END(_rtld_bind_start)