Patchwork [12/12] RISC-V: Linux Startup and Dynamic Loading Code

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Submitter Palmer Dabbelt
Date June 14, 2017, 6:30 p.m.
Message ID <20170614183048.11040-13-palmer@dabbelt.com>
Download mbox | patch
Permalink /patch/21020/
State New
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Comments

Palmer Dabbelt - June 14, 2017, 6:30 p.m.
This contains the Linux-specific code for loading programs on RISC-V.
---
 sysdeps/unix/sysv/linux/riscv/dl-static.c | 85 +++++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/riscv/ldconfig.h  | 37 ++++++++++++++
 sysdeps/unix/sysv/linux/riscv/ldsodefs.h  | 34 +++++++++++++
 3 files changed, 156 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/riscv/dl-static.c
 create mode 100644 sysdeps/unix/sysv/linux/riscv/ldconfig.h
 create mode 100644 sysdeps/unix/sysv/linux/riscv/ldsodefs.h

Patch

diff --git a/sysdeps/unix/sysv/linux/riscv/dl-static.c b/sysdeps/unix/sysv/linux/riscv/dl-static.c
new file mode 100644
index 0000000000..2a6b849c61
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/dl-static.c
@@ -0,0 +1,85 @@ 
+/* Variable initialization.  RISC-V version
+   Copyright (C) 2001-2003, 2005, 2017 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.  */
+
+#include <ldsodefs.h>
+
+#ifdef SHARED
+
+void
+_dl_var_init (void *array[])
+{
+  /* It has to match "variables" below. */
+  enum
+    {
+      DL_PAGESIZE = 0
+    };
+
+  GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]);
+}
+
+#else
+
+static void *variables[] =
+{
+  &GLRO(dl_pagesize)
+};
+
+static void
+_dl_unprotect_relro (struct link_map *l)
+{
+  ElfW(Addr) start = ((l->l_addr + l->l_relro_addr)
+		      & ~(GLRO(dl_pagesize) - 1));
+  ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size)
+		    & ~(GLRO(dl_pagesize) - 1));
+
+  if (start != end)
+    __mprotect ((void *) start, end - start, PROT_READ | PROT_WRITE);
+}
+
+void
+_dl_static_init (struct link_map *l)
+{
+  struct link_map *rtld_map = l;
+  struct r_scope_elem **scope;
+  const ElfW(Sym) *ref = NULL;
+  lookup_t loadbase;
+  void (*f) (void *[]);
+  size_t i;
+
+  loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope,
+				  NULL, 0, 1, NULL);
+
+  for (scope = l->l_local_scope; *scope != NULL; scope++)
+    for (i = 0; i < (*scope)->r_nlist; i++)
+      if ((*scope)->r_list[i] == loadbase)
+	{
+	  rtld_map = (*scope)->r_list[i];
+	  break;
+	}
+
+  if (ref != NULL)
+    {
+      f = (void (*) (void *[])) DL_SYMBOL_ADDRESS (loadbase, ref);
+      _dl_unprotect_relro (rtld_map);
+      f (variables);
+      _dl_protect_relro (rtld_map);
+    }
+}
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/ldconfig.h b/sysdeps/unix/sysv/linux/riscv/ldconfig.h
new file mode 100644
index 0000000000..4a5d2fbb1c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h
@@ -0,0 +1,37 @@ 
+/* Copyright (C) 2001, 2002, 2003, 2017 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.  */
+
+#include <sysdeps/generic/ldconfig.h>
+
+#define LD_SO_PREFIX "/lib/ld-linux-"
+#define LD_SO_SUFFIX ".so.1"
+
+#if __riscv_xlen == 64
+# define LD_SO_ABI "riscv64-lp64"
+#else
+# define LD_SO_ABI "riscv32-ilp32"
+#endif
+
+#define SYSDEP_KNOWN_INTERPRETER_NAMES				\
+  { LD_SO_PREFIX LD_SO_ABI "d" LD_SO_SUFFIX, FLAG_ELF_LIBC6 },	\
+  { LD_SO_PREFIX LD_SO_ABI "f" LD_SO_SUFFIX, FLAG_ELF_LIBC6 },	\
+  { LD_SO_PREFIX LD_SO_ABI     LD_SO_SUFFIX, FLAG_ELF_LIBC6 },
+
+#define SYSDEP_KNOWN_LIBRARY_NAMES	\
+  { "libc.so.6", FLAG_ELF_LIBC6 },	\
+  { "libm.so.6", FLAG_ELF_LIBC6 },
diff --git a/sysdeps/unix/sysv/linux/riscv/ldsodefs.h b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h
new file mode 100644
index 0000000000..3959603975
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h
@@ -0,0 +1,34 @@ 
+/* Run-time dynamic linker data structures for loaded ELF shared objects.
+   RISC-V
+   Copyright (C) 2001, 2003, 2017 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.  */
+
+#ifndef	_LDSODEFS_H
+
+/* Get the real definitions.  */
+#include_next <ldsodefs.h>
+
+/* Now define our stuff.  */
+
+/* We need special support to initialize DSO loaded for statically linked
+   binaries.  */
+extern void _dl_static_init (struct link_map *map);
+#undef DL_STATIC_INIT
+#define DL_STATIC_INIT(map) _dl_static_init (map)
+
+#endif /* ldsodefs.h */