From: Palmer Dabbelt <palmer@dabbelt.com>
To: libc-alpha@sourceware.org, joseph@codesourcery.com
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Subject: [PATCH v7 13/17] RISC-V: Linux Startup and Dynamic Loading Code
Date: Sat, 27 Jan 2018 09:04:00 -0000 [thread overview]
Message-ID: <20180127035744.10058-14-palmer@dabbelt.com> (raw)
In-Reply-To: <20180127035744.10058-1-palmer@dabbelt.com>
This contains the Linux-specific code for loading programs on RISC-V.
2018-01-26 Palmer Dabbelt <palmer@sifive.com>
* sysdeps/unix/sysv/linux/riscv/dl-static.c: New file.
* sysdeps/unix/sysv/linux/riscv/ldconfig.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/ldsodefs.h: Likewise.
---
sysdeps/unix/sysv/linux/riscv/dl-static.c | 84 +++++++++++++++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/ldconfig.h | 36 +++++++++++++
sysdeps/unix/sysv/linux/riscv/ldsodefs.h | 32 ++++++++++++
3 files changed, 152 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
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 000000000000..f88512a8a954
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/dl-static.c
@@ -0,0 +1,84 @@
+/* Variable initialization. RISC-V version
+ Copyright (C) 2001-2018 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
+ <http://www.gnu.org/licenses/>. */
+
+#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 000000000000..0ca798a870f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h
@@ -0,0 +1,36 @@
+/* ldconfig default paths and libraries. Linux/RISC-V version.
+ Copyright (C) 2001-2018 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
+ <http://www.gnu.org/licenses/>. */
+
+#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
+# error "rv32i-based targets are not supported"
+#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 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 000000000000..b9421ffdfa21
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h
@@ -0,0 +1,32 @@
+/* RISC-V dynamic linker data structures for loaded ELF shared objects.
+ Copyright (C) 2001-2018 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
+ <http://www.gnu.org/licenses/>. */
+
+#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 */
--
2.13.6
next prev parent reply other threads:[~2018-01-27 3:58 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-27 3:58 RISC-V glibc port, v7 Palmer Dabbelt
2018-01-27 3:58 ` [PATCH v7 02/17] Skeleton documentation for the RISC-V port Palmer Dabbelt
2018-02-05 9:19 ` Andreas Schwab
2018-02-08 21:13 ` Palmer Dabbelt
2018-02-08 21:33 ` Jim Wilson
2018-02-12 10:09 ` Andreas Schwab
2018-01-27 3:58 ` [PATCH v7 03/17] Add RISC-V entries to config.h.in Palmer Dabbelt
2018-01-27 3:58 ` [PATCH v7 05/17] RISC-V: ABI Implementation Palmer Dabbelt
2018-01-29 16:35 ` Joseph Myers
2018-01-29 16:39 ` Palmer Dabbelt
2018-01-27 8:08 ` [PATCH v7 16/17] Add RISC-V to build-many-glibcs.py Palmer Dabbelt
2018-01-27 8:12 ` [PATCH v7 09/17] RISC-V: Hard Float Support Palmer Dabbelt
2018-01-27 8:13 ` [PATCH v7 17/17] RISC-V: Add ipc_priv.h Palmer Dabbelt
2018-01-27 8:40 ` [PATCH v7 07/17] RISC-V: Thread-Local Storage Support Palmer Dabbelt
2018-07-11 15:28 ` Andreas Schwab
2018-01-27 8:59 ` [PATCH v7 04/17] Add documentation for __riscv_flush_icache Palmer Dabbelt
2018-01-27 9:04 ` Palmer Dabbelt [this message]
2018-01-27 9:05 ` [PATCH v7 15/17] RISC-V: Build Infastructure Palmer Dabbelt
2018-01-27 9:07 ` [PATCH v7 01/17] sysdeps/init_array: Add PREINIT_FUNCTION to crti.S Palmer Dabbelt
2018-01-27 9:20 ` [PATCH v7 06/17] RISC-V: Startup and Dynamic Loading Code Palmer Dabbelt
2018-01-29 16:36 ` Joseph Myers
2018-01-29 16:56 ` Palmer Dabbelt
2018-01-27 12:12 ` [PATCH v7 08/17] RISC-V: Generic <math.h> and soft-fp Routines Palmer Dabbelt
2018-01-27 12:19 ` [PATCH v7 14/17] RISC-V: Add ABI Lists Palmer Dabbelt
2018-01-27 12:34 ` [PATCH v7 10/17] RISC-V: Atomic and Locking Routines Palmer Dabbelt
2018-01-27 12:34 ` [PATCH v7 11/17] RISC-V: Linux Syscall Interface Palmer Dabbelt
2018-01-27 15:07 ` [PATCH v7 12/17] RISC-V: Linux ABI Palmer Dabbelt
2018-01-27 21:28 ` RISC-V glibc port, v7 Darius Rad
2018-01-29 16:43 ` Joseph Myers
2018-01-29 22:01 ` Palmer Dabbelt
2018-01-29 22:01 ` Andrew Waterman
2018-01-29 22:09 ` Joseph Myers
2018-01-29 22:09 ` Andrew Waterman
2018-01-29 22:01 ` Palmer Dabbelt
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