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- /*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
- *
- * Copyright 1996-1998 John D. Polstra.
- * All rights reserved.
- *
- * 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 ``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 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.
- *
- * $FreeBSD$
- */
- #include <sys/param.h>
- #include <sys/kernel.h>
- #include <sys/systm.h>
- #define __ELF_WORD_SIZE 32
- #include <sys/exec.h>
- #include <sys/imgact.h>
- #include <sys/malloc.h>
- #include <sys/proc.h>
- #include <sys/namei.h>
- #include <sys/fcntl.h>
- #include <sys/sysent.h>
- #include <sys/imgact_elf.h>
- #include <sys/jail.h>
- #include <sys/smp.h>
- #include <sys/syscall.h>
- #include <sys/sysctl.h>
- #include <sys/signalvar.h>
- #include <sys/vnode.h>
- #include <sys/linker.h>
- #include <vm/vm.h>
- #include <vm/vm_param.h>
- #include <machine/altivec.h>
- #include <machine/cpu.h>
- #include <machine/fpu.h>
- #include <machine/elf.h>
- #include <machine/reg.h>
- #include <machine/md_var.h>
- #include <powerpc/powerpc/elf_common.c>
- #ifdef __powerpc64__
- #include <compat/freebsd32/freebsd32_proto.h>
- #include <compat/freebsd32/freebsd32_util.h>
- extern const char *freebsd32_syscallnames[];
- static void ppc32_fixlimit(struct rlimit *rl, int which);
- static SYSCTL_NODE(_compat, OID_AUTO, ppc32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "32-bit mode");
- #define PPC32_MAXDSIZ (1024*1024*1024)
- static u_long ppc32_maxdsiz = PPC32_MAXDSIZ;
- SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ppc32_maxdsiz,
- 0, "");
- #define PPC32_MAXSSIZ (64*1024*1024)
- u_long ppc32_maxssiz = PPC32_MAXSSIZ;
- SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ppc32_maxssiz,
- 0, "");
- #else
- static void ppc32_runtime_resolve(void);
- #endif
- struct sysentvec elf32_freebsd_sysvec = {
- .sv_size = SYS_MAXSYSCALL,
- #ifdef __powerpc64__
- .sv_table = freebsd32_sysent,
- #else
- .sv_table = sysent,
- #endif
- .sv_transtrap = NULL,
- .sv_fixup = __elfN(freebsd_fixup),
- .sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs),
- .sv_sendsig = sendsig,
- .sv_sigcode = sigcode32,
- .sv_szsigcode = &szsigcode32,
- .sv_name = "FreeBSD ELF32",
- .sv_coredump = __elfN(coredump),
- .sv_imgact_try = NULL,
- .sv_minsigstksz = MINSIGSTKSZ,
- .sv_minuser = VM_MIN_ADDRESS,
- .sv_stackprot = VM_PROT_ALL,
- #ifdef __powerpc64__
- .sv_maxuser = VM_MAXUSER_ADDRESS32,
- .sv_usrstack = FREEBSD32_USRSTACK,
- .sv_psstrings = FREEBSD32_PS_STRINGS,
- .sv_copyout_strings = freebsd32_copyout_strings,
- .sv_setregs = ppc32_setregs,
- .sv_syscallnames = freebsd32_syscallnames,
- .sv_fixlimit = ppc32_fixlimit,
- #else
- .sv_maxuser = VM_MAXUSER_ADDRESS,
- .sv_usrstack = USRSTACK,
- .sv_psstrings = PS_STRINGS,
- .sv_copyout_strings = exec_copyout_strings,
- .sv_setregs = exec_setregs,
- .sv_syscallnames = syscallnames,
- .sv_fixlimit = NULL,
- #endif
- .sv_maxssiz = NULL,
- .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_ASLR |
- SV_TIMEKEEP | SV_RNG_SEED_VER,
- .sv_set_syscall_retval = cpu_set_syscall_retval,
- .sv_fetch_syscall_args = cpu_fetch_syscall_args,
- .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
- .sv_shared_page_len = PAGE_SIZE,
- .sv_schedtail = NULL,
- .sv_thread_detach = NULL,
- .sv_trap = NULL,
- .sv_hwcap = &cpu_features,
- .sv_hwcap2 = &cpu_features2,
- };
- INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
- static Elf32_Brandinfo freebsd_brand_info = {
- .brand = ELFOSABI_FREEBSD,
- .machine = EM_PPC,
- .compat_3_brand = "FreeBSD",
- .emul_path = NULL,
- .interp_path = "/libexec/ld-elf.so.1",
- .sysvec = &elf32_freebsd_sysvec,
- #ifdef __powerpc64__
- .interp_newpath = "/libexec/ld-elf32.so.1",
- #else
- .interp_newpath = NULL,
- #endif
- .brand_note = &elf32_freebsd_brandnote,
- .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
- };
- SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
- (sysinit_cfunc_t) elf32_insert_brand_entry,
- &freebsd_brand_info);
- static Elf32_Brandinfo freebsd_brand_oinfo = {
- .brand = ELFOSABI_FREEBSD,
- .machine = EM_PPC,
- .compat_3_brand = "FreeBSD",
- .emul_path = NULL,
- .interp_path = "/usr/libexec/ld-elf.so.1",
- .sysvec = &elf32_freebsd_sysvec,
- .interp_newpath = NULL,
- .brand_note = &elf32_freebsd_brandnote,
- .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
- };
- SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
- (sysinit_cfunc_t) elf32_insert_brand_entry,
- &freebsd_brand_oinfo);
- void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
- void
- elf32_dump_thread(struct thread *td, void *dst, size_t *off)
- {
- size_t len;
- struct pcb *pcb;
- uint64_t vshr[32];
- uint64_t *vsr_dw1;
- int vsr_idx;
- len = 0;
- pcb = td->td_pcb;
- if (pcb->pcb_flags & PCB_VEC) {
- save_vec_nodrop(td);
- if (dst != NULL) {
- len += elf32_populate_note(NT_PPC_VMX,
- &pcb->pcb_vec, (char *)dst + len,
- sizeof(pcb->pcb_vec), NULL);
- } else
- len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
- sizeof(pcb->pcb_vec), NULL);
- }
- if (pcb->pcb_flags & PCB_VSX) {
- save_fpu_nodrop(td);
- if (dst != NULL) {
- /*
- * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
- * VSR32-VSR63 overlap with VR0-VR31, so we only copy
- * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
- */
- for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) {
- vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
- vshr[vsr_idx] = *vsr_dw1;
- }
- len += elf32_populate_note(NT_PPC_VSX,
- vshr, (char *)dst + len,
- sizeof(vshr), NULL);
- } else
- len += elf32_populate_note(NT_PPC_VSX, NULL, NULL,
- sizeof(vshr), NULL);
- }
- *off = len;
- }
- #ifndef __powerpc64__
- bool
- elf_is_ifunc_reloc(Elf_Size r_info)
- {
- return (ELF_R_TYPE(r_info) == R_PPC_IRELATIVE);
- }
- /* Process one elf relocation with addend. */
- static int
- elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
- int type, int local, elf_lookup_fn lookup)
- {
- Elf_Addr *where;
- Elf_Half *hwhere;
- Elf_Addr addr;
- Elf_Addr addend, val;
- Elf_Word rtype, symidx;
- const Elf_Rela *rela;
- int error;
- switch (type) {
- case ELF_RELOC_REL:
- panic("PPC only supports RELA relocations");
- break;
- case ELF_RELOC_RELA:
- rela = (const Elf_Rela *)data;
- where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
- hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
- addend = rela->r_addend;
- rtype = ELF_R_TYPE(rela->r_info);
- symidx = ELF_R_SYM(rela->r_info);
- break;
- default:
- panic("elf_reloc: unknown relocation mode %d\n", type);
- }
- switch (rtype) {
- case R_PPC_NONE:
- break;
- case R_PPC_ADDR32: /* word32 S + A */
- error = lookup(lf, symidx, 1, &addr);
- if (error != 0)
- return (-1);
- *where = elf_relocaddr(lf, addr + addend);
- break;
- case R_PPC_ADDR16_LO: /* #lo(S) */
- error = lookup(lf, symidx, 1, &addr);
- if (error != 0)
- return (-1);
- /*
- * addend values are sometimes relative to sections
- * (i.e. .rodata) in rela, where in reality they
- * are relative to relocbase. Detect this condition.
- */
- if (addr > relocbase && addr <= (relocbase + addend))
- addr = relocbase;
- addr = elf_relocaddr(lf, addr + addend);
- *hwhere = addr & 0xffff;
- break;
- case R_PPC_ADDR16_HA: /* #ha(S) */
- error = lookup(lf, symidx, 1, &addr);
- if (error != 0)
- return (-1);
- /*
- * addend values are sometimes relative to sections
- * (i.e. .rodata) in rela, where in reality they
- * are relative to relocbase. Detect this condition.
- */
- if (addr > relocbase && addr <= (relocbase + addend))
- addr = relocbase;
- addr = elf_relocaddr(lf, addr + addend);
- *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
- & 0xffff;
- break;
- case R_PPC_RELATIVE: /* word32 B + A */
- *where = elf_relocaddr(lf, relocbase + addend);
- break;
- case R_PPC_JMP_SLOT: /* PLT jump slot entry */
- /*
- * We currently only support Secure-PLT jump slots.
- * Given that we reject BSS-PLT modules during load, we
- * don't need to check again.
- * The method we are using here is equivilent to
- * LD_BIND_NOW.
- */
- error = lookup(lf, symidx, 1, &addr);
- if (error != 0)
- return (-1);
- *where = elf_relocaddr(lf, addr + addend);
- break;
- case R_PPC_IRELATIVE:
- addr = relocbase + addend;
- val = ((Elf32_Addr (*)(void))addr)();
- if (*where != val)
- *where = val;
- break;
- default:
- printf("kldload: unexpected relocation type %d, "
- "symbol index %d\n", (int)rtype, symidx);
- return (-1);
- }
- return (0);
- }
- void
- elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
- {
- Elf_Rela *rela = NULL, *relalim;
- Elf_Addr relasz = 0;
- Elf_Addr *where;
- /*
- * Extract the rela/relasz values from the dynamic section
- */
- for (; dynp->d_tag != DT_NULL; dynp++) {
- switch (dynp->d_tag) {
- case DT_RELA:
- rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
- break;
- case DT_RELASZ:
- relasz = dynp->d_un.d_val;
- break;
- }
- }
- /*
- * Relocate these values
- */
- relalim = (Elf_Rela *)((caddr_t)rela + relasz);
- for (; rela < relalim; rela++) {
- if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
- continue;
- where = (Elf_Addr *)(relocbase + rela->r_offset);
- *where = (Elf_Addr)(relocbase + rela->r_addend);
- }
- }
- 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)
- {
- /* Only sync the cache for non-kernel modules */
- if (lf->id != 1)
- __syncicache(lf->address, lf->size);
- return (0);
- }
- int
- elf_cpu_unload_file(linker_file_t lf __unused)
- {
- return (0);
- }
- static void
- ppc32_runtime_resolve()
- {
- /*
- * Since we don't support lazy binding, panic immediately if anyone
- * manages to call the runtime resolver.
- */
- panic("kldload: Runtime resolver was called unexpectedly!");
- }
- int
- elf_cpu_parse_dynamic(caddr_t loadbase, Elf_Dyn *dynamic)
- {
- Elf_Dyn *dp;
- bool has_plt = false;
- bool secure_plt = false;
- Elf_Addr *got;
- for (dp = dynamic; dp->d_tag != DT_NULL; dp++) {
- switch (dp->d_tag) {
- case DT_PPC_GOT:
- secure_plt = true;
- got = (Elf_Addr *)(loadbase + dp->d_un.d_ptr);
- /* Install runtime resolver canary. */
- got[1] = (Elf_Addr)ppc32_runtime_resolve;
- got[2] = (Elf_Addr)0;
- break;
- case DT_PLTGOT:
- has_plt = true;
- break;
- }
- }
- if (has_plt && !secure_plt) {
- printf("kldload: BSS-PLT modules are not supported.\n");
- return (-1);
- }
- return (0);
- }
- #endif
- #ifdef __powerpc64__
- static void
- ppc32_fixlimit(struct rlimit *rl, int which)
- {
- switch (which) {
- case RLIMIT_DATA:
- if (ppc32_maxdsiz != 0) {
- if (rl->rlim_cur > ppc32_maxdsiz)
- rl->rlim_cur = ppc32_maxdsiz;
- if (rl->rlim_max > ppc32_maxdsiz)
- rl->rlim_max = ppc32_maxdsiz;
- }
- break;
- case RLIMIT_STACK:
- if (ppc32_maxssiz != 0) {
- if (rl->rlim_cur > ppc32_maxssiz)
- rl->rlim_cur = ppc32_maxssiz;
- if (rl->rlim_max > ppc32_maxssiz)
- rl->rlim_max = ppc32_maxssiz;
- }
- break;
- }
- }
- #endif
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