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RISC-V: Linux Startup and Dynamic Loading Code

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This contains the Linux-specific code for loading programs on RISC-V.

2018-01-29  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.
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Palmer Dabbelt 2018-01-29 10:29:13 -08:00
parent 7f33b09c65
commit ee53fed9d8
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@ -127,6 +127,9 @@
* sysdeps/unix/sysv/linux/riscv/sys/user.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/ucontext-macros.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/ucontext_i.sym: Likewise.
* 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.
2018-01-29 Florian Weimer <fweimer@redhat.com>

84
sysdeps/unix/sysv/linux/riscv/dl-static.c Normal file
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/* 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

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sysdeps/unix/sysv/linux/riscv/ldconfig.h Normal file
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/* 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 },

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sysdeps/unix/sysv/linux/riscv/ldsodefs.h Normal file
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/* 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 */