xref: /freebsd-11.0-release/libexec/rtld-elf/riscv/rtld_machdep.h

/*-
 * Copyright (c) 1999, 2000 John D. Polstra.
 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * Portions of this software were developed by SRI International and the
 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Portions of this software were developed by the University of Cambridge
 * Computer Laboratory as part of the CTSRD Project, with support from the
 * UK Higher Education Innovation Fund (HEIF).
 *
 * 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 AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: releng/11.0/libexec/rtld-elf/riscv/rtld_machdep.h 294623 2016-01-23 11:46:52Z br $
 */

#ifndef RTLD_MACHDEP_H
#define RTLD_MACHDEP_H	1

#include <sys/types.h>
#include <machine/atomic.h>

struct Struct_Obj_Entry;

uint64_t set_gp(struct Struct_Obj_Entry *obj);

/* Return the address of the .dynamic section in the dynamic linker. */
#define rtld_dynamic(obj)                                               \
({                                                                      \
	Elf_Addr _dynamic_addr;                                         \
	__asm __volatile("lla       %0, _DYNAMIC" : "=r"(_dynamic_addr));   \
	(const Elf_Dyn *)_dynamic_addr;                                 \
})
#define RTLD_IS_DYNAMIC() (1)

Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
		       const struct Struct_Obj_Entry *defobj,
		       const struct Struct_Obj_Entry *obj,
		       const Elf_Rel *rel);

#define make_function_pointer(def, defobj) \
	((defobj)->relocbase + (def)->st_value)

#define call_initfini_pointer(obj, target)				\
({									\
	uint64_t old0;							\
	old0 = set_gp(obj);						\
	(((InitFunc)(target))());					\
	__asm __volatile("mv    gp, %0" :: "r"(old0));			\
})

#define call_init_pointer(obj, target)					\
({									\
	uint64_t old1;							\
	old1 = set_gp(obj);						\
	(((InitArrFunc)(target))(main_argc, main_argv, environ));	\
	__asm __volatile("mv    gp, %0" :: "r"(old1));			\
})

/*
 * Lazy binding entry point, called via PLT.
 */
void _rtld_bind_start(void);

/*
 * TLS
 */
#define	TLS_TP_OFFSET	0x0
#define	TLS_DTV_OFFSET	0x800
#define	TLS_TCB_SIZE	16

#define round(size, align) \
    (((size) + (align) - 1) & ~((align) - 1))
#define calculate_first_tls_offset(size, align) \
    round(16, align)
#define calculate_tls_offset(prev_offset, prev_size, size, align) \
    round(prev_offset + prev_size, align)
#define calculate_tls_end(off, size)    ((off) + (size))

typedef struct {
	unsigned long ti_module;
	unsigned long ti_offset;
} tls_index;

extern void *__tls_get_addr(tls_index* ti);

#define	RTLD_DEFAULT_STACK_PF_EXEC	PF_X
#define	RTLD_DEFAULT_STACK_EXEC		PROT_EXEC

#define	md_abi_variant_hook(x)

#endif