[OpenRISC] [PATCH v4 04/13] or1k: startup and dynamic linking code

Stafford Horne
2021-12-29T04:42:42Z

Code for C runtime startup and dynamic loading including PLT layout.
---
sysdeps/or1k/bits/link.h | 54 +++++++
sysdeps/or1k/dl-machine.h | 300 +++++++++++++++++++++++++++++++++++++
sysdeps/or1k/dl-start.S | 98 ++++++++++++
sysdeps/or1k/ldsodefs.h | 40 +++++
sysdeps/or1k/sotruss-lib.c | 51 +++++++
sysdeps/or1k/start.S | 99 ++++++++++++
sysdeps/or1k/tst-audit.h | 24 +++
7 files changed, 666 insertions(+)
create mode 100644 sysdeps/or1k/bits/link.h
create mode 100644 sysdeps/or1k/dl-machine.h
create mode 100644 sysdeps/or1k/dl-start.S
create mode 100644 sysdeps/or1k/ldsodefs.h
create mode 100644 sysdeps/or1k/sotruss-lib.c
create mode 100644 sysdeps/or1k/start.S
create mode 100644 sysdeps/or1k/tst-audit.h

diff --git a/sysdeps/or1k/bits/link.h b/sysdeps/or1k/bits/link.h
new file mode 100644
index 0000000000..f291d66269
--- /dev/null
+++ b/sysdeps/or1k/bits/link.h
@@ -0,0 +1,54 @@
+/* Declarations for dynamic linker interface. OpenRISC version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LINK_H
+# error "Never include <bits/link.h> directly; use <link.h> instead."
+#endif
+
+/* Registers for entry into PLT. */
+typedef struct La_or1k_regs
+{
+ uint32_t lr_reg[6]; /* Args passed in r3-r8. */
+ uint32_t lr_sp; /* Register r1. */
+ uint32_t lr_lr; /* Register r9. */
+} La_or1k_regs;
+
+/* Return values for calls from PLT. */
+typedef struct La_or1k_retval
+{
+ /* Up to two 32-bit registers used for a return value. */
+ uint32_t lrv_reg[2];
+} La_or1k_retval;
+
+__BEGIN_DECLS
+
+extern ElfW(Addr) la_or1k_gnu_pltenter (ElfW(Sym) *__sym, unsigned int __ndx,
+ uintptr_t *__refcook,
+ uintptr_t *__defcook,
+ La_or1k_regs *__regs,
+ unsigned int *__flags,
+ const char *__symname,
+ long int *__framesizep);
+extern unsigned int la_or1k_gnu_pltexit (ElfW(Sym) *__sym, unsigned int __ndx,
+ uintptr_t *__refcook,
+ uintptr_t *__defcook,
+ const La_or1k_regs *__inregs,
+ La_or1k_retval *__outregs,
+ const char *__symname);
+
+__END_DECLS
diff --git a/sysdeps/or1k/dl-machine.h b/sysdeps/or1k/dl-machine.h
new file mode 100644
index 0000000000..ec4db533d2
--- /dev/null
+++ b/sysdeps/or1k/dl-machine.h
@@ -0,0 +1,300 @@
+/* Machine-dependent ELF dynamic relocation inline functions. OpenRISC version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef dl_machine_h
+#define dl_machine_h
+
+#define ELF_MACHINE_NAME "or1k"
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <tls.h>
+#include <dl-irel.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
+
+/* Return nonzero iff ELF header is compatible with the running host. */
+static inline int __attribute__ ((unused))
+elf_machine_matches_host (const Elf32_Ehdr *ehdr)
+{
+ return ehdr->e_machine == EM_OPENRISC;
+}
+
+static inline Elf32_Addr *
+or1k_get_got (void)
+{
+ Elf32_Addr *got;
+
+ asm ("l.jal 0x8\n"
+ " l.movhi %0, gotpchi(_GLOBAL_OFFSET_TABLE_-4)\n"
+ "l.ori %0, %0, gotpclo(_GLOBAL_OFFSET_TABLE_+0)\n"
+ "l.add %0, %0, r9\n"
+ : "=r" (got) : : "r9");
+
+ return got;
+}
+
+/* Return the link-time address of _DYNAMIC. Conveniently, this is the
+ first element of the GOT. */
+static inline Elf32_Addr
+elf_machine_dynamic (void)
+{
+ Elf32_Addr *got = or1k_get_got ();
+ return *got;
+}
+
+
+/* Return the run-time load address of the shared object. */
+static inline Elf32_Addr
+elf_machine_load_address (void)
+{
+ /* Compute the difference between the runtime address of _DYNAMIC as seen
+ by a GOTOFF reference, and the link-time address found in the special
+ unrelocated first GOT entry. */
+ Elf32_Addr dyn;
+ Elf32_Addr *got = or1k_get_got ();
+
+ asm ("l.movhi %0, gotoffhi(_DYNAMIC);"
+ "l.ori %0, %0, gotofflo(_DYNAMIC);"
+ "l.add %0, %0, %1;"
+ : "=&r"(dyn) : "r"(got));
+
+ return dyn - *got;
+}
+
+/* Initial entry point code for the dynamic linker. The function _dl_start
+ is the real entry point; it's return value is the user program's entry
+ point.
+
+ Code is really located in dl-start.S, just tell the linker that it
+ exists. */
+#define RTLD_START asm (".globl _dl_start");
+
+/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
+ TLS variable, so undefined references should not be allowed to
+ define the value.
+ ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
+ of the main executable's symbols, as for a COPY reloc. */
+
+#define elf_machine_type_class(type) \
+ (((type) == R_OR1K_JMP_SLOT \
+ || (type) == R_OR1K_TLS_DTPMOD \
+ || (type) == R_OR1K_TLS_DTPOFF \
+ || (type) == R_OR1K_TLS_TPOFF) * ELF_RTYPE_CLASS_PLT \
+ | ((type) == R_OR1K_COPY) * ELF_RTYPE_CLASS_COPY)
+
+/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
+#define ELF_MACHINE_JMP_SLOT R_OR1K_JMP_SLOT
+
+#define ARCH_LA_PLTENTER or1k_gnu_pltenter
+#define ARCH_LA_PLTEXIT or1k_gnu_pltexit
+
+/* Set up the loaded object described by L so its unrelocated PLT
+ entries will jump to the on-demand fixup code in dl-runtime.c. */
+static inline int __attribute__ ((unused, always_inline))
+elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
+ int lazy, int profile)
+{
+ ElfW(Addr) *pltgot;
+ extern void _dl_runtime_resolve (ElfW(Word));
+ extern void _dl_runtime_profile (ElfW(Word));
+
+ if (l->l_info[DT_JMPREL] && lazy)
+ {
+ pltgot = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
+
+ /* Fill in initial entrys of the plt */
+
+ /* Register the link_map address in the plt at pltgot[1].
+ This will also be used in the resolver for accessing the
+ link_map structure. */
+ pltgot[1] = (ElfW(Addr)) l;
+
+ /* This function will get called to fix up the GOT entry and
+ then jump to the resolved address. */
+ pltgot[2] = (ElfW(Addr)) &_dl_runtime_resolve;
+
+ }
+
+ return lazy;
+}
+
+/* Mask identifying addresses reserved for the user program,
+ where the dynamic linker should not map anything. */
+#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
+
+/* We define an initialization functions. This is called very early in
+ _dl_sysdep_start. */
+#define DL_PLATFORM_INIT dl_platform_init ()
+
+static inline void __attribute__ ((unused))
+dl_platform_init (void)
+{
+ if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
+ /* Avoid an empty string which would disturb us. */
+ GLRO(dl_platform) = NULL;
+}
+
+static inline ElfW(Addr)
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+ const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
+ const ElfW(Rela) *reloc,
+ ElfW(Addr) *reloc_addr, ElfW(Addr) value)
+{
+ return *reloc_addr = value;
+}
+
+/* Return the final value of a plt relocation. */
+static inline Elf32_Addr
+elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
+ Elf32_Addr value)
+{
+ return value + reloc->r_addend;
+}
+
+
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE_MAP
+
+/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
+ MAP is the object containing the reloc. */
+
+static inline void
+__attribute ((always_inline))
+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
+ const ElfW(Rela) *reloc, const ElfW(Sym) *sym,
+ const struct r_found_version *version,
+ void *const reloc_addr_arg, int skip_ifunc)
+{
+ Elf32_Addr *const reloc_addr = reloc_addr_arg;
+ const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
+
+ if (__glibc_unlikely (r_type == R_OR1K_NONE))
+ return;
+ else
+ {
+# ifndef RESOLVE_CONFLICT_FIND_MAP
+ const Elf32_Sym *const refsym = sym;
+# endif
+ struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
+ r_type);
+ Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true);
+
+ if (sym != NULL
+ && __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
+ && __glibc_likely (sym->st_shndx != SHN_UNDEF)
+ && __glibc_likely (!skip_ifunc))
+ value = elf_ifunc_invoke (value);
+
+ switch (r_type)
+ {
+# ifndef RESOLVE_CONFLICT_FIND_MAP
+ case R_OR1K_COPY:
+ if (sym == NULL)
+ /* This can happen in trace mode if an object could not be
+ found. */
+ break;
+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
+ && GLRO(dl_verbose)))
+ {
+ const char *strtab;
+
+ strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
+ _dl_error_printf ("\
+%s: Symbol `%s' has different size in shared object, consider re-linking\n",
+ rtld_progname ?: "<program name unknown>",
+ strtab + refsym->st_name);
+ }
+ memcpy (reloc_addr_arg, (void *) value,
+ MIN (sym->st_size, refsym->st_size));
+ break;
+# endif /* !RESOLVE_CONFLICT_FIND_MAP */
+ case R_OR1K_32:
+ /* Support relocations on mis-aligned offsets. */
+ value += reloc->r_addend;
+ memcpy (reloc_addr_arg, &value, 4);
+ break;
+ case R_OR1K_GLOB_DAT:
+ case R_OR1K_JMP_SLOT:
+ *reloc_addr = value + reloc->r_addend;
+ break;
+ case R_OR1K_TLS_DTPMOD:
+# ifdef RTLD_BOOTSTRAP
+ /* During startup the dynamic linker is always the module
+ with index 1. */
+ *reloc_addr = 1;
+# else
+ if (sym_map != NULL)
+ *reloc_addr = sym_map->l_tls_modid;
+# endif
+ break;
+ case R_OR1K_TLS_DTPOFF:
+# ifndef RTLD_BOOTSTRAP
+ *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
+# endif
+ break;
+
+ case R_OR1K_TLS_TPOFF:
+# ifdef RTLD_BOOTSTRAP
+ *reloc_addr = sym->st_value + reloc->r_addend +
+ map->l_tls_offset - TLS_TCB_SIZE;
+# else
+ if (sym_map != NULL)
+ {
+ CHECK_STATIC_TLS (map, sym_map);
+ *reloc_addr = sym->st_value + reloc->r_addend +
+ sym_map->l_tls_offset - TLS_TCB_SIZE;
+ }
+# endif
+ break;
+ default:
+ _dl_reloc_bad_type (map, r_type, 0);
+ break;
+ }
+ }
+}
+
+static inline void
+__attribute__ ((always_inline))
+elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ void *const reloc_addr_arg)
+{
+ Elf32_Addr *const reloc_addr = reloc_addr_arg;
+ *reloc_addr = l_addr + reloc->r_addend;
+}
+
+static inline void
+__attribute__ ((always_inline))
+elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
+ ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
+ int skip_ifunc)
+{
+ Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
+ const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
+
+ if (__glibc_likely (r_type == R_OR1K_JMP_SLOT))
+ *reloc_addr += l_addr;
+ else if (__glibc_unlikely (r_type == R_OR1K_NONE))
+ return;
+ else
+ _dl_reloc_bad_type (map, r_type, 1);
+}
+
+#endif /* RESOLVE_MAP */
diff --git a/sysdeps/or1k/dl-start.S b/sysdeps/or1k/dl-start.S
new file mode 100644
index 0000000000..ecb1505427
--- /dev/null
+++ b/sysdeps/or1k/dl-start.S
@@ -0,0 +1,98 @@
+/* Machine-dependent ELF startup code. OpenRISC version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+/* Initial entry point code for the dynamic linker.
+ The function _dl_start is the real entry point;
+ it's return value is the user program's entry point. */
+ENTRY (_start)
+ /* Count arguments in r11 */
+ l.ori r3, r1, 0
+ l.movhi r11, 0
+1:
+ l.addi r3, r3, 4
+ l.lwz r12, 0(r3)
+ l.sfnei r12, 0
+ l.addi r11, r11, 1
+ l.bf 1b
+ l.nop
+ l.addi r11, r11, -1
+ /* store argument counter to stack. */
+ l.sw 0(r1), r11
+
+ /* Load the PIC register. */
+ l.jal 0x8
+ l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4)
+ l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0)
+ l.add r16, r16, r9
+
+ l.ori r3, r1, 0
+
+ l.jal _dl_start
+ l.nop
+ /* Save user entry in a call saved reg. */
+ l.ori r22, r11, 0
+ /* Fall through to _dl_start_user. */
+
+_dl_start_user:
+ /* Set up for _dl_init. */
+
+ /* Load _rtld_local (a.k.a _dl_loaded). */
+ l.lwz r12, got(_rtld_local)(r16)
+ l.lwz r3, 0(r12)
+
+ /* Load argc */
+ l.lwz r18, got(_dl_argc)(r16)
+ l.lwz r4, 0(r18)
+
+ /* Load argv */
+ l.lwz r20, got(_dl_argv)(r16)
+ l.lwz r5, 0(r20)
+
+ /* Load envp = &argv[argc + 1]. */
+ l.slli r6, r4, 2
+ l.addi r6, r6, 4
+ l.add r6, r6, r5
+
+ l.jal plt(_dl_init)
+ l.nop
+
+ /* Now set up for user entry.
+ The already defined ABI loads argc and argv from the stack.
+
+ argc = 0(r1)
+ argv = r1 + 4
+ */
+
+ /* Load SP as argv - 4. */
+ l.lwz r3, 0(r20)
+ l.addi r1, r3, -4
+
+ /* Save argc. */
+ l.lwz r3, 0(r18)
+ l.sw 0(r1), r3
+
+ /* Pass _dl_fini function address to _start.
+ Next start.S will then pass this as rtld_fini to __libc_start_main. */
+ l.lwz r3, got(_dl_fini)(r16)
+
+ l.jr r22
+ l.nop
+
+END (_start)
diff --git a/sysdeps/or1k/ldsodefs.h b/sysdeps/or1k/ldsodefs.h
new file mode 100644
index 0000000000..89713fcc70
--- /dev/null
+++ b/sysdeps/or1k/ldsodefs.h
@@ -0,0 +1,40 @@
+/* Run-time dynamic linker data structures for loaded ELF shared objects.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _OR1K_LDSODEFS_H
+#define _OR1K_LDSODEFS_H 1
+
+#include <elf.h>
+
+struct La_or1k_regs;
+struct La_or1k_retval;
+
+#define ARCH_PLTENTER_MEMBERS \
+ uintptr_t (*or1k_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *, \
+ uintptr_t *, struct La_or1k_regs *, \
+ unsigned int *, const char *name, \
+ long int *framesizep)
+
+#define ARCH_PLTEXIT_MEMBERS \
+ unsigned int (*or1k_gnu_pltexit) (Elf32_Sym *, unsigned int, uintptr_t *, \
+ uintptr_t *, const struct La_or1k_regs *, \
+ struct La_or1k_retval *, const char *)
+
+#include_next <ldsodefs.h>
+
+#endif
diff --git a/sysdeps/or1k/sotruss-lib.c b/sysdeps/or1k/sotruss-lib.c
new file mode 100644
index 0000000000..3755b7afd5
--- /dev/null
+++ b/sysdeps/or1k/sotruss-lib.c
@@ -0,0 +1,51 @@
+/* Override generic sotruss-lib.c to define actual functions for OpenRISC.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define HAVE_ARCH_PLTENTER
+#define HAVE_ARCH_PLTEXIT
+
+#include <elf/sotruss-lib.c>
+
+ElfW(Addr)
+la_or1k_gnu_pltenter (ElfW(Sym) *sym __attribute__ ((unused)),
+ unsigned int ndx __attribute__ ((unused)),
+ uintptr_t *refcook, uintptr_t *defcook,
+ La_or1k_regs *regs, unsigned int *flags,
+ const char *symname, long int *framesizep)
+{
+ print_enter (refcook, defcook, symname,
+ regs->lr_reg[0], regs->lr_reg[1], regs->lr_reg[2],
+ *flags);
+
+ /* No need to copy anything, we will not need the parameters in any case. */
+ *framesizep = 0;
+
+ return sym->st_value;
+}
+
+unsigned int
+la_or1k_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
+ uintptr_t *defcook,
+ const struct La_or1k_regs *inregs,
+ struct La_or1k_retval *outregs,
+ const char *symname)
+{
+ print_exit (refcook, defcook, symname, outregs->lrv_reg[0]);
+
+ return 0;
+}
diff --git a/sysdeps/or1k/start.S b/sysdeps/or1k/start.S
new file mode 100644
index 0000000000..0424355f36
--- /dev/null
+++ b/sysdeps/or1k/start.S
@@ -0,0 +1,99 @@
+/* start, OpenRISC version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* This is the canonical entry point, usually the first thing in the text
+ segment.
+
+ sp The stack contains the arguments and environment:
+ 0(sp) argc
+ 4(sp) argv[0]
+ ...
+ (4*argc)(sp) NULL
+ (4*(argc+1))(sp) envp[0]
+ ...
+ NULL
+ */
+
+#define __ASSEMBLY__
+#include <sysdep.h>
+#include <entry.h>
+
+ENTRY (ENTRY_POINT)
+
+ /* Setup Arguments to the __libc_start_main function. */
+
+ /* Take values for argc and argv off the stack.
+ These will be passed as arguments two and three to main
+ and thus go in registers r4 and r5, respectively. */
+ l.lwz r4, 0(r1)
+ l.addi r5, r1, 4
+
+ /* Pass in rtld_fini from dl-start.S. */
+ l.or r8, r3, r3
+
+#ifdef PIC
+ /* Obtain a pointer to .got in r16 */
+ l.jal 0x8
+ l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4)
+ l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0)
+ l.add r16, r16, r9
+
+ /* Pass in the the main symbol. */
+ l.lwz r3, got(main)(r16)
+#else
+ /* Pass in the the main symbol. */
+ l.movhi r3, hi(main)
+ l.ori r3, r3, lo(main)
+#endif
+ /* Used to be init and fini. */
+ l.movhi r6, 0x0
+ l.movhi r7, 0x0
+
+ /* Push stack limit onto the stack.
+ This provides the highest stack address to user code (as stack grows
+ downwards.
+ This is the seventh argument to __libc_start_main and thus needs to
+ be passed on the stack. */
+ l.sw -4(r1), r1
+
+ /* Adjust stack to account for a total of 7 args (i.e. the last one is
+ on the stack. */
+ l.addi r1, r1, -4
+
+ /* Clear the frame pointer and link register since this is the
+ outermost frame. */
+ l.movhi r2, 0x0
+ l.movhi r9, 0x0
+
+ /* Let the libc call main and exit with its return code. */
+#ifdef PIC
+ l.j plt(__libc_start_main)
+#else
+ l.j __libc_start_main
+#endif
+ l.nop
+END (ENTRY_POINT)
+
+ /* Define a symbol for the first piece of initialized data. */
+ .data
+ .globl __data_start
+__data_start:
+ .long 0
+ .weak data_start
+ data_start = __data_start
diff --git a/sysdeps/or1k/tst-audit.h b/sysdeps/or1k/tst-audit.h
new file mode 100644
index 0000000000..66cb2ee48c
--- /dev/null
+++ b/sysdeps/or1k/tst-audit.h
@@ -0,0 +1,24 @@
+/* Definitions for testing PLT entry/exit auditing. OpenRISC version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define pltenter la_or1k_gnu_pltenter
+#define pltexit la_or1k_gnu_pltexit
+#define La_regs La_or1k_regs
+#define La_retval La_or1k_retval
+#define int_retval lrv_reg[0]
--
2.31.1