mirror of https://github.com/F-Stack/f-stack.git
290 lines
7.1 KiB
C
290 lines
7.1 KiB
C
/*-
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* Copyright 1996-1998 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_cpu.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/linker.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/imgact_elf.h>
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#include <sys/syscall.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <machine/elf.h>
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#include <machine/md_var.h>
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#include <machine/npx.h>
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#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
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#define CPU_ENABLE_SSE
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#endif
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struct sysentvec elf32_freebsd_sysvec = {
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.sv_size = SYS_MAXSYSCALL,
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.sv_table = sysent,
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.sv_mask = 0,
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.sv_errsize = 0,
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.sv_errtbl = NULL,
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.sv_transtrap = NULL,
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.sv_fixup = __elfN(freebsd_fixup),
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.sv_sendsig = sendsig,
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.sv_sigcode = sigcode,
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.sv_szsigcode = &szsigcode,
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.sv_name = "FreeBSD ELF32",
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.sv_coredump = __elfN(coredump),
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.sv_imgact_try = NULL,
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.sv_minsigstksz = MINSIGSTKSZ,
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.sv_pagesize = PAGE_SIZE,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS,
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = exec_copyout_strings,
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.sv_setregs = exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP |
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SV_TIMEKEEP,
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.sv_set_syscall_retval = cpu_set_syscall_retval,
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.sv_fetch_syscall_args = cpu_fetch_syscall_args,
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.sv_syscallnames = syscallnames,
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.sv_shared_page_base = SHAREDPAGE,
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.sv_shared_page_len = PAGE_SIZE,
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.sv_schedtail = NULL,
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.sv_thread_detach = NULL,
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.sv_trap = NULL,
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};
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INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
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static Elf32_Brandinfo freebsd_brand_info = {
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.brand = ELFOSABI_FREEBSD,
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.machine = EM_386,
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.compat_3_brand = "FreeBSD",
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.emul_path = NULL,
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.interp_path = "/libexec/ld-elf.so.1",
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.sysvec = &elf32_freebsd_sysvec,
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.interp_newpath = NULL,
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.brand_note = &elf32_freebsd_brandnote,
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.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
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};
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SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
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(sysinit_cfunc_t) elf32_insert_brand_entry,
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&freebsd_brand_info);
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static Elf32_Brandinfo freebsd_brand_oinfo = {
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.brand = ELFOSABI_FREEBSD,
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.machine = EM_386,
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.compat_3_brand = "FreeBSD",
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.emul_path = NULL,
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.interp_path = "/usr/libexec/ld-elf.so.1",
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.sysvec = &elf32_freebsd_sysvec,
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.interp_newpath = NULL,
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.brand_note = &elf32_freebsd_brandnote,
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.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
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};
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SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
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(sysinit_cfunc_t) elf32_insert_brand_entry,
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&freebsd_brand_oinfo);
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static Elf32_Brandinfo kfreebsd_brand_info = {
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.brand = ELFOSABI_FREEBSD,
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.machine = EM_386,
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.compat_3_brand = "FreeBSD",
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.emul_path = NULL,
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.interp_path = "/lib/ld.so.1",
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.sysvec = &elf32_freebsd_sysvec,
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.interp_newpath = NULL,
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.brand_note = &elf32_kfreebsd_brandnote,
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.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
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};
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SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
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(sysinit_cfunc_t) elf32_insert_brand_entry,
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&kfreebsd_brand_info);
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void
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elf32_dump_thread(struct thread *td, void *dst, size_t *off)
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{
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#ifdef CPU_ENABLE_SSE
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void *buf;
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#endif
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size_t len;
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len = 0;
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#ifdef CPU_ENABLE_SSE
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if (use_xsave) {
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if (dst != NULL) {
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npxgetregs(td);
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len += elf32_populate_note(NT_X86_XSTATE,
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get_pcb_user_save_td(td), dst,
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cpu_max_ext_state_size, &buf);
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*(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
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xsave_mask;
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} else
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len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
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cpu_max_ext_state_size, NULL);
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}
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#endif
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*off = len;
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}
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/* Process one elf relocation with addend. */
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static int
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elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
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int type, int local, elf_lookup_fn lookup)
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{
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Elf_Addr *where;
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Elf_Addr addr;
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Elf_Addr addend;
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Elf_Word rtype, symidx;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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int error;
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switch (type) {
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case ELF_RELOC_REL:
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rel = (const Elf_Rel *)data;
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where = (Elf_Addr *) (relocbase + rel->r_offset);
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addend = *where;
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rtype = ELF_R_TYPE(rel->r_info);
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symidx = ELF_R_SYM(rel->r_info);
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break;
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case ELF_RELOC_RELA:
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rela = (const Elf_Rela *)data;
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where = (Elf_Addr *) (relocbase + rela->r_offset);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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symidx = ELF_R_SYM(rela->r_info);
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break;
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default:
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panic("unknown reloc type %d\n", type);
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}
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if (local) {
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if (rtype == R_386_RELATIVE) { /* A + B */
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addr = elf_relocaddr(lf, relocbase + addend);
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if (*where != addr)
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*where = addr;
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}
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return (0);
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}
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switch (rtype) {
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case R_386_NONE: /* none */
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break;
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case R_386_32: /* S + A */
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error = lookup(lf, symidx, 1, &addr);
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if (error != 0)
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return -1;
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addr += addend;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_PC32: /* S + A - P */
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error = lookup(lf, symidx, 1, &addr);
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if (error != 0)
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return -1;
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addr += addend - (Elf_Addr)where;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_COPY: /* none */
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/*
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* There shouldn't be copy relocations in kernel
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* objects.
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*/
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printf("kldload: unexpected R_COPY relocation\n");
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return -1;
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break;
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case R_386_GLOB_DAT: /* S */
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error = lookup(lf, symidx, 1, &addr);
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if (error != 0)
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return -1;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_RELATIVE:
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break;
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default:
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printf("kldload: unexpected relocation type %d\n",
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rtype);
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return -1;
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}
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return(0);
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}
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int
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elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
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elf_lookup_fn lookup)
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{
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return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
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}
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int
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elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
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int type, elf_lookup_fn lookup)
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{
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return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
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}
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int
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elf_cpu_load_file(linker_file_t lf __unused)
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{
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return (0);
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}
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int
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elf_cpu_unload_file(linker_file_t lf __unused)
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{
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return (0);
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}
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