Index: stable/12/sys/riscv/riscv/elf_machdep.c
===================================================================
--- stable/12/sys/riscv/riscv/elf_machdep.c (revision 354261)
+++ stable/12/sys/riscv/riscv/elf_machdep.c (revision 354262)
@@ -1,493 +1,506 @@
/*-
* Copyright 1996-1998 John D. Polstra.
* Copyright (c) 2015 Ruslan Bukin
* Copyright (c) 2016 Yukishige Shibata
* 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.
*/
#include
__FBSDID("$FreeBSD$");
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
u_long elf_hwcap;
struct sysentvec elf64_freebsd_sysvec = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
.sv_mask = 0,
.sv_errsize = 0,
.sv_errtbl = NULL,
.sv_transtrap = NULL,
.sv_fixup = __elfN(freebsd_fixup),
.sv_sendsig = sendsig,
.sv_sigcode = sigcode,
.sv_szsigcode = &szsigcode,
.sv_name = "FreeBSD ELF64",
.sv_coredump = __elfN(coredump),
.sv_imgact_try = NULL,
.sv_minsigstksz = MINSIGSTKSZ,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = VM_MAXUSER_ADDRESS,
.sv_usrstack = USRSTACK,
.sv_psstrings = PS_STRINGS,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_strings = exec_copyout_strings,
.sv_setregs = exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_ASLR,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_shared_page_base = SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
.sv_hwcap = &elf_hwcap,
};
INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
static Elf64_Brandinfo freebsd_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_RISCV,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf64_freebsd_sysvec,
.interp_newpath = NULL,
.brand_note = &elf64_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
};
SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
(sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
static bool debug_kld;
SYSCTL_BOOL(_debug, OID_AUTO, kld_reloc, CTLFLAG_RW, &debug_kld, 0,
"Activate debug prints in elf_reloc_internal()");
struct type2str_ent {
int type;
const char *str;
};
void
elf64_dump_thread(struct thread *td, void *dst, size_t *off)
{
}
/*
* Following 4 functions are used to manupilate bits on 32bit interger value.
* FIXME: I implemetend for ease-to-understand rather than for well-optimized.
*/
static uint32_t
gen_bitmask(int msb, int lsb)
{
uint32_t mask;
if (msb == sizeof(mask) * 8 - 1)
mask = ~0;
else
mask = (1U << (msb + 1)) - 1;
if (lsb > 0)
mask &= ~((1U << lsb) - 1);
return (mask);
}
static uint32_t
extract_bits(uint32_t x, int msb, int lsb)
{
uint32_t mask;
mask = gen_bitmask(msb, lsb);
x &= mask;
x >>= lsb;
return (x);
}
static uint32_t
insert_bits(uint32_t d, uint32_t s, int msb, int lsb)
{
uint32_t mask;
mask = gen_bitmask(msb, lsb);
d &= ~mask;
s <<= lsb;
s &= mask;
return (d | s);
}
static uint32_t
insert_imm(uint32_t insn, uint32_t imm, int imm_msb, int imm_lsb,
int insn_lsb)
{
int insn_msb;
uint32_t v;
v = extract_bits(imm, imm_msb, imm_lsb);
insn_msb = (imm_msb - imm_lsb) + insn_lsb;
return (insert_bits(insn, v, insn_msb, insn_lsb));
}
/*
* The RISC-V ISA is designed so that all of immediate values are
* sign-extended.
* An immediate value is sometimes generated at runtime by adding
* 12bit sign integer and 20bit signed integer. This requests 20bit
* immediate value to be ajusted if the MSB of the 12bit immediate
* value is asserted (sign-extended value is treated as negative value).
*
* For example, 0x123800 can be calculated by adding upper 20 bit of
* 0x124000 and sign-extended 12bit immediate whose bit pattern is
* 0x800 as follows:
* 0x123800
* = 0x123000 + 0x800
* = (0x123000 + 0x1000) + (-0x1000 + 0x800)
* = (0x123000 + 0x1000) + (0xff...ff800)
* = 0x124000 + sign-extention(0x800)
*/
static uint32_t
calc_hi20_imm(uint32_t value)
{
/*
* There is the arithmetical hack that can remove conditional
* statement. But I implement it in straightforward way.
*/
if ((value & 0x800) != 0)
value += 0x1000;
return (value & ~0xfff);
}
static const struct type2str_ent t2s[] = {
{ R_RISCV_NONE, "R_RISCV_NONE" },
{ R_RISCV_64, "R_RISCV_64" },
{ R_RISCV_JUMP_SLOT, "R_RISCV_JUMP_SLOT" },
{ R_RISCV_RELATIVE, "R_RISCV_RELATIVE" },
{ R_RISCV_JAL, "R_RISCV_JAL" },
{ R_RISCV_CALL, "R_RISCV_CALL" },
{ R_RISCV_PCREL_HI20, "R_RISCV_PCREL_HI20" },
{ R_RISCV_PCREL_LO12_I, "R_RISCV_PCREL_LO12_I" },
{ R_RISCV_PCREL_LO12_S, "R_RISCV_PCREL_LO12_S" },
{ R_RISCV_HI20, "R_RISCV_HI20" },
{ R_RISCV_LO12_I, "R_RISCV_LO12_I" },
{ R_RISCV_LO12_S, "R_RISCV_LO12_S" },
};
static const char *
reloctype_to_str(int type)
{
int i;
for (i = 0; i < sizeof(t2s) / sizeof(t2s[0]); ++i) {
if (type == t2s[i].type)
return t2s[i].str;
}
return "*unknown*";
}
bool
elf_is_ifunc_reloc(Elf_Size r_info __unused)
{
return (false);
}
/*
* Currently kernel loadable module for RISCV is compiled with -fPIC option.
* (see also additional CFLAGS definition for RISCV in sys/conf/kmod.mk)
* Only R_RISCV_64, R_RISCV_JUMP_SLOT and RISCV_RELATIVE are emitted in
* the module. Other relocations will be processed when kernel loadable
* modules are built in non-PIC.
*
* FIXME: only RISCV64 is supported.
*/
static int
elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, int local, elf_lookup_fn lookup)
{
Elf_Size rtype, symidx;
const Elf_Rela *rela;
Elf_Addr val, addr;
Elf64_Addr *where;
Elf_Addr addend;
uint32_t before32_1;
uint32_t before32;
uint64_t before64;
uint32_t *insn32p;
uint32_t imm20;
int error;
switch (type) {
case ELF_RELOC_RELA:
rela = (const Elf_Rela *)data;
where = (Elf_Addr *)(relocbase + rela->r_offset);
insn32p = (uint32_t *)where;
addend = rela->r_addend;
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
break;
default:
printf("%s:%d unknown reloc type %d\n",
__FUNCTION__, __LINE__, type);
return (-1);
}
switch (rtype) {
case R_RISCV_NONE:
break;
case R_RISCV_64:
case R_RISCV_JUMP_SLOT:
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
val = addr;
before64 = *where;
if (*where != val)
*where = val;
if (debug_kld)
printf("%p %c %-24s %016lx -> %016lx\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before64, *where);
break;
case R_RISCV_RELATIVE:
before64 = *where;
*where = elf_relocaddr(lf, relocbase + addend);
if (debug_kld)
printf("%p %c %-24s %016lx -> %016lx\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before64, *where);
break;
case R_RISCV_JAL:
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
val = addr - (Elf_Addr)where;
if (val <= -(1UL << 20) || (1UL << 20) <= val) {
printf("kldload: huge offset against R_RISCV_JAL\n");
return (-1);
}
before32 = *insn32p;
*insn32p = insert_imm(*insn32p, val, 20, 20, 31);
*insn32p = insert_imm(*insn32p, val, 10, 1, 21);
*insn32p = insert_imm(*insn32p, val, 11, 11, 20);
*insn32p = insert_imm(*insn32p, val, 19, 12, 12);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_CALL:
/*
* R_RISCV_CALL relocates 8-byte region that consists
* of the sequence of AUIPC and JALR.
*/
/* Calculate and check the pc relative offset. */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
val = addr - (Elf_Addr)where;
if (val <= -(1UL << 32) || (1UL << 32) <= val) {
printf("kldload: huge offset against R_RISCV_CALL\n");
return (-1);
}
/* Relocate AUIPC. */
before32 = insn32p[0];
imm20 = calc_hi20_imm(val);
insn32p[0] = insert_imm(insn32p[0], imm20, 31, 12, 12);
/* Relocate JALR. */
before32_1 = insn32p[1];
insn32p[1] = insert_imm(insn32p[1], val, 11, 0, 20);
if (debug_kld)
printf("%p %c %-24s %08x %08x -> %08x %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, insn32p[0], before32_1, insn32p[1]);
break;
case R_RISCV_PCREL_HI20:
+ error = lookup(lf, symidx, 1, &addr);
+ if (error != 0)
+ return (-1);
+
val = addr - (Elf_Addr)where;
insn32p = (uint32_t *)where;
before32 = *insn32p;
imm20 = calc_hi20_imm(val);
*insn32p = insert_imm(*insn32p, imm20, 31, 12, 12);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_PCREL_LO12_I:
+ error = lookup(lf, symidx, 1, &addr);
+ if (error != 0)
+ return (-1);
+
val = addr - (Elf_Addr)where;
insn32p = (uint32_t *)where;
before32 = *insn32p;
*insn32p = insert_imm(*insn32p, addr, 11, 0, 20);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_PCREL_LO12_S:
+ error = lookup(lf, symidx, 1, &addr);
+ if (error != 0)
+ return (-1);
+
val = addr - (Elf_Addr)where;
insn32p = (uint32_t *)where;
before32 = *insn32p;
*insn32p = insert_imm(*insn32p, addr, 11, 5, 25);
*insn32p = insert_imm(*insn32p, addr, 4, 0, 7);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_HI20:
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
+ val = addr;
insn32p = (uint32_t *)where;
before32 = *insn32p;
imm20 = calc_hi20_imm(val);
*insn32p = insert_imm(*insn32p, imm20, 31, 12, 12);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_LO12_I:
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
val = addr;
insn32p = (uint32_t *)where;
before32 = *insn32p;
*insn32p = insert_imm(*insn32p, addr, 11, 0, 20);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
case R_RISCV_LO12_S:
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
val = addr;
insn32p = (uint32_t *)where;
before32 = *insn32p;
*insn32p = insert_imm(*insn32p, addr, 11, 5, 25);
*insn32p = insert_imm(*insn32p, addr, 4, 0, 7);
if (debug_kld)
printf("%p %c %-24s %08x -> %08x\n", where,
(local ? 'l' : 'g'), reloctype_to_str(rtype),
before32, *insn32p);
break;
default:
printf("kldload: unexpected relocation type %ld\n", rtype);
return (-1);
}
return (0);
}
int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
}
int
elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
}
int
elf_cpu_load_file(linker_file_t lf __unused)
{
return (0);
}
int
elf_cpu_unload_file(linker_file_t lf __unused)
{
return (0);
}
Index: stable/12
===================================================================
--- stable/12 (revision 354261)
+++ stable/12 (revision 354262)
Property changes on: stable/12
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
Merged /head:r352730