2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright 1996-1998 John D. Polstra.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
34 #define __ELF_WORD_SIZE 32
37 #include <sys/imgact.h>
38 #include <sys/malloc.h>
40 #include <sys/namei.h>
41 #include <sys/fcntl.h>
42 #include <sys/sysent.h>
43 #include <sys/imgact_elf.h>
44 #include <sys/syscall.h>
45 #include <sys/sysctl.h>
46 #include <sys/signalvar.h>
47 #include <sys/vnode.h>
48 #include <sys/linker.h>
51 #include <vm/vm_param.h>
53 #include <machine/altivec.h>
54 #include <machine/cpu.h>
55 #include <machine/fpu.h>
56 #include <machine/elf.h>
57 #include <machine/reg.h>
58 #include <machine/md_var.h>
61 #include <compat/freebsd32/freebsd32_proto.h>
62 #include <compat/freebsd32/freebsd32_util.h>
64 extern const char *freebsd32_syscallnames[];
65 static void ppc32_fixlimit(struct rlimit *rl, int which);
67 static SYSCTL_NODE(_compat, OID_AUTO, ppc32, CTLFLAG_RW, 0, "32-bit mode");
69 #define PPC32_MAXDSIZ (1024*1024*1024)
70 static u_long ppc32_maxdsiz = PPC32_MAXDSIZ;
71 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ppc32_maxdsiz,
73 #define PPC32_MAXSSIZ (64*1024*1024)
74 u_long ppc32_maxssiz = PPC32_MAXSSIZ;
75 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ppc32_maxssiz,
79 struct sysentvec elf32_freebsd_sysvec = {
80 .sv_size = SYS_MAXSYSCALL,
82 .sv_table = freebsd32_sysent,
89 .sv_fixup = __elfN(freebsd_fixup),
90 .sv_sendsig = sendsig,
91 .sv_sigcode = sigcode32,
92 .sv_szsigcode = &szsigcode32,
93 .sv_name = "FreeBSD ELF32",
94 .sv_coredump = __elfN(coredump),
95 .sv_imgact_try = NULL,
96 .sv_minsigstksz = MINSIGSTKSZ,
97 .sv_minuser = VM_MIN_ADDRESS,
98 .sv_stackprot = VM_PROT_ALL,
100 .sv_maxuser = VM_MAXUSER_ADDRESS32,
101 .sv_usrstack = FREEBSD32_USRSTACK,
102 .sv_psstrings = FREEBSD32_PS_STRINGS,
103 .sv_copyout_strings = freebsd32_copyout_strings,
104 .sv_setregs = ppc32_setregs,
105 .sv_syscallnames = freebsd32_syscallnames,
106 .sv_fixlimit = ppc32_fixlimit,
108 .sv_maxuser = VM_MAXUSER_ADDRESS,
109 .sv_usrstack = USRSTACK,
110 .sv_psstrings = PS_STRINGS,
111 .sv_copyout_strings = exec_copyout_strings,
112 .sv_setregs = exec_setregs,
113 .sv_syscallnames = syscallnames,
117 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_ASLR,
118 .sv_set_syscall_retval = cpu_set_syscall_retval,
119 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
120 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
121 .sv_shared_page_len = PAGE_SIZE,
122 .sv_schedtail = NULL,
123 .sv_thread_detach = NULL,
125 .sv_hwcap = &cpu_features,
126 .sv_hwcap2 = &cpu_features2,
128 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
130 static Elf32_Brandinfo freebsd_brand_info = {
131 .brand = ELFOSABI_FREEBSD,
133 .compat_3_brand = "FreeBSD",
135 .interp_path = "/libexec/ld-elf.so.1",
136 .sysvec = &elf32_freebsd_sysvec,
138 .interp_newpath = "/libexec/ld-elf32.so.1",
140 .interp_newpath = NULL,
142 .brand_note = &elf32_freebsd_brandnote,
143 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
146 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
147 (sysinit_cfunc_t) elf32_insert_brand_entry,
148 &freebsd_brand_info);
150 static Elf32_Brandinfo freebsd_brand_oinfo = {
151 .brand = ELFOSABI_FREEBSD,
153 .compat_3_brand = "FreeBSD",
155 .interp_path = "/usr/libexec/ld-elf.so.1",
156 .sysvec = &elf32_freebsd_sysvec,
157 .interp_newpath = NULL,
158 .brand_note = &elf32_freebsd_brandnote,
159 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
162 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
163 (sysinit_cfunc_t) elf32_insert_brand_entry,
164 &freebsd_brand_oinfo);
166 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
169 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
180 if (pcb->pcb_flags & PCB_VEC) {
183 len += elf32_populate_note(NT_PPC_VMX,
184 &pcb->pcb_vec, (char *)dst + len,
185 sizeof(pcb->pcb_vec), NULL);
187 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
188 sizeof(pcb->pcb_vec), NULL);
191 if (pcb->pcb_flags & PCB_VSX) {
195 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
196 * VSR32-VSR63 overlap with VR0-VR31, so we only copy
197 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
199 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) {
200 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
201 vshr[vsr_idx] = *vsr_dw1;
203 len += elf32_populate_note(NT_PPC_VSX,
204 vshr, (char *)dst + len,
207 len += elf32_populate_note(NT_PPC_VSX, NULL, NULL,
214 #ifndef __powerpc64__
216 elf_is_ifunc_reloc(Elf_Size r_info __unused)
222 /* Process one elf relocation with addend. */
224 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
225 int type, int local, elf_lookup_fn lookup)
231 Elf_Word rtype, symidx;
232 const Elf_Rela *rela;
237 panic("PPC only supports RELA relocations");
240 rela = (const Elf_Rela *)data;
241 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
242 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
243 addend = rela->r_addend;
244 rtype = ELF_R_TYPE(rela->r_info);
245 symidx = ELF_R_SYM(rela->r_info);
248 panic("elf_reloc: unknown relocation mode %d\n", type);
256 case R_PPC_ADDR32: /* word32 S + A */
257 error = lookup(lf, symidx, 1, &addr);
260 *where = elf_relocaddr(lf, addr + addend);
263 case R_PPC_ADDR16_LO: /* #lo(S) */
264 error = lookup(lf, symidx, 1, &addr);
268 * addend values are sometimes relative to sections
269 * (i.e. .rodata) in rela, where in reality they
270 * are relative to relocbase. Detect this condition.
272 if (addr > relocbase && addr <= (relocbase + addend))
274 addr = elf_relocaddr(lf, addr + addend);
275 *hwhere = addr & 0xffff;
278 case R_PPC_ADDR16_HA: /* #ha(S) */
279 error = lookup(lf, symidx, 1, &addr);
283 * addend values are sometimes relative to sections
284 * (i.e. .rodata) in rela, where in reality they
285 * are relative to relocbase. Detect this condition.
287 if (addr > relocbase && addr <= (relocbase + addend))
289 addr = elf_relocaddr(lf, addr + addend);
290 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
294 case R_PPC_RELATIVE: /* word32 B + A */
295 *where = elf_relocaddr(lf, relocbase + addend);
299 printf("kldload: unexpected relocation type %d\n",
307 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
309 Elf_Rela *rela = NULL, *relalim;
314 * Extract the rela/relasz values from the dynamic section
316 for (; dynp->d_tag != DT_NULL; dynp++) {
317 switch (dynp->d_tag) {
319 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
322 relasz = dynp->d_un.d_val;
328 * Relocate these values
330 relalim = (Elf_Rela *)((caddr_t)rela + relasz);
331 for (; rela < relalim; rela++) {
332 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
334 where = (Elf_Addr *)(relocbase + rela->r_offset);
335 *where = (Elf_Addr)(relocbase + rela->r_addend);
340 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
341 elf_lookup_fn lookup)
344 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
348 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
349 int type, elf_lookup_fn lookup)
352 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
356 elf_cpu_load_file(linker_file_t lf)
358 /* Only sync the cache for non-kernel modules */
360 __syncicache(lf->address, lf->size);
365 elf_cpu_unload_file(linker_file_t lf __unused)
374 ppc32_fixlimit(struct rlimit *rl, int which)
378 if (ppc32_maxdsiz != 0) {
379 if (rl->rlim_cur > ppc32_maxdsiz)
380 rl->rlim_cur = ppc32_maxdsiz;
381 if (rl->rlim_max > ppc32_maxdsiz)
382 rl->rlim_max = ppc32_maxdsiz;
386 if (ppc32_maxssiz != 0) {
387 if (rl->rlim_cur > ppc32_maxssiz)
388 rl->rlim_cur = ppc32_maxssiz;
389 if (rl->rlim_max > ppc32_maxssiz)
390 rl->rlim_max = ppc32_maxssiz;