kboot: aarch64 support
Add support for aarch64. exec.c and ldscript are copied from the EFI version with #ifdefs for the differences. Once complete, I'll refactor them. host_syscall.S implements a generic system call. tramp.S is a first attempt to create a tramoline that we can use to jump to the aarch64 kernel. Add aarch64-specific startup and stat files as well. exec.c tweaked slightly to avoid bringing in bi_load(), which will come in later. Includes tweaks to stat due to name differences between names on different Linux architectures. Sponsored by: Netflix
This commit is contained in:
Warner Losh
parent
a0c075229f
commit
75cbdbc983
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@ -0,0 +1,12 @@
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SRCS+= host_syscall.S tramp.S exec.c load_addr.c
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.PATH: ${BOOTSRC}/arm64/libarm64
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CFLAGS+=-I${BOOTSRC}/arm64/libarm64
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SRCS+= cache.c
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CFLAGS+= -I${SYSDIR}/contrib/dev/acpica/include
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# load address. set in linker script
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RELOC?= 0x0
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CFLAGS+= -DRELOC=${RELOC}
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LDFLAGS= -nostdlib -static -T ${.CURDIR}/arch/${MACHINE_ARCH}/ldscript.${MACHINE_ARCH}
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@ -0,0 +1,188 @@
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/*-
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* Copyright (c) 2006 Marcel Moolenaar
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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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*
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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 <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <bootstrap.h>
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#ifdef EFI
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#include <efi.h>
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#include <efilib.h>
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#include "loader_efi.h"
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#endif
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#include "bootstrap.h"
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#include "platform/acfreebsd.h"
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#include "acconfig.h"
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#define ACPI_SYSTEM_XFACE
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#include "actypes.h"
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#include "actbl.h"
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#include "cache.h"
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#ifdef EFI
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static EFI_GUID acpi_guid = ACPI_TABLE_GUID;
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static EFI_GUID acpi20_guid = ACPI_20_TABLE_GUID;
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#endif
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static int elf64_exec(struct preloaded_file *amp);
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static int elf64_obj_exec(struct preloaded_file *amp);
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/* Stub out temporarily */
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static int
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bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp,
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bool exit_bs)
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{
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return EINVAL;
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}
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static struct file_format arm64_elf = {
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elf64_loadfile,
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elf64_exec
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};
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struct file_format *file_formats[] = {
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&arm64_elf,
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NULL
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};
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static int
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elf64_exec(struct preloaded_file *fp)
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{
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vm_offset_t modulep, kernendp;
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vm_offset_t clean_addr;
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size_t clean_size;
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struct file_metadata *md;
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Elf_Ehdr *ehdr;
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void (*entry)(vm_offset_t);
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int err;
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#ifdef EFI
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ACPI_TABLE_RSDP *rsdp;
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char buf[24];
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int revision;
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#endif
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/*
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* Report the RSDP to the kernel. The old code used the 'hints' method
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* to communite this to the kernel. However, while convenient, the
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* 'hints' method is fragile and does not work when static hints are
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* compiled into the kernel. Instead, move to setting different tunables
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* that start with acpi. The old 'hints' can be removed before we branch
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* for FreeBSD 15.
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*/
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#ifdef EFI
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rsdp = efi_get_table(&acpi20_guid);
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if (rsdp == NULL) {
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rsdp = efi_get_table(&acpi_guid);
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}
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if (rsdp != NULL) {
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sprintf(buf, "0x%016llx", (unsigned long long)rsdp);
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setenv("hint.acpi.0.rsdp", buf, 1);
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setenv("acpi.rsdp", buf, 1);
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revision = rsdp->Revision;
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if (revision == 0)
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revision = 1;
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sprintf(buf, "%d", revision);
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setenv("hint.acpi.0.revision", buf, 1);
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setenv("acpi.revision", buf, 1);
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strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));
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buf[sizeof(rsdp->OemId)] = '\0';
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setenv("hint.acpi.0.oem", buf, 1);
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setenv("acpi.oem", buf, 1);
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sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress);
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setenv("hint.acpi.0.rsdt", buf, 1);
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setenv("acpi.rsdt", buf, 1);
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if (revision >= 2) {
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/* XXX extended checksum? */
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sprintf(buf, "0x%016llx",
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(unsigned long long)rsdp->XsdtPhysicalAddress);
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setenv("hint.acpi.0.xsdt", buf, 1);
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setenv("acpi.xsdt", buf, 1);
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sprintf(buf, "%d", rsdp->Length);
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setenv("hint.acpi.0.xsdt_length", buf, 1);
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setenv("acpi.xsdt_length", buf, 1);
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}
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}
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#else
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#endif
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if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
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return(EFTYPE);
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ehdr = (Elf_Ehdr *)&(md->md_data);
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#ifdef EFI
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entry = efi_translate(ehdr->e_entry);
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efi_time_fini();
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#else
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entry = (void *)ehdr->e_entry;
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#endif
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err = bi_load(fp->f_args, &modulep, &kernendp, true);
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if (err != 0) {
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#ifdef EFI
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efi_time_init();
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#endif
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return (err);
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}
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dev_cleanup();
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/* Clean D-cache under kernel area and invalidate whole I-cache */
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#ifdef EFI
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clean_addr = (vm_offset_t)efi_translate(fp->f_addr);
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clean_size = (vm_offset_t)efi_translate(kernendp) - clean_addr;
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#else
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clean_addr = (vm_offset_t)fp->f_addr;
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clean_size = (vm_offset_t)kernendp - clean_addr;
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#endif
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cpu_flush_dcache((void *)clean_addr, clean_size);
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cpu_inval_icache();
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(*entry)(modulep);
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panic("exec returned");
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}
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static int
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elf64_obj_exec(struct preloaded_file *fp)
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{
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printf("%s called for preloaded file %p (=%s):\n", __func__, fp,
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fp->f_name);
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return (ENOSYS);
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}
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@ -0,0 +1,18 @@
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#include <machine/asm.h>
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/*
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* Emulate the Linux system call interface. System call number in x8.
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* Args in x0, x1, x2, x3, x4 and x5. Return in x0.
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*/
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ENTRY(host_syscall)
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mov x8, x0
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mov x0, x1
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mov x1, x2
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mov x2, x3
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mov x3, x4
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mov x4, x5
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mov x5, x6
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svc 0
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ret
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/* Note: We're exposing the raw return value to the caller */
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END(host_syscall)
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/* $FreeBSD$ */
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OUTPUT_FORMAT("elf64-aarch64", "elf64-aarch64", "elf64-aarch64")
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OUTPUT_ARCH(aarch64)
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ENTRY(_start)
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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. = 0x401000;
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ImageBase = .;
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.hash : { *(.hash) } /* this MUST come first! */
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. = ALIGN(4096);
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.eh_frame :
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{
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*(.eh_frame)
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}
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. = ALIGN(4096);
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.text : {
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*(.text .stub .text.* .gnu.linkonce.t.*)
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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*(.plt)
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} =0xCCCCCCCC
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. = ALIGN(4096);
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.data : {
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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*(.rodata1)
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|
*(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
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*(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
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*(.opd)
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*(.data .data.* .gnu.linkonce.d.*)
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*(.data1)
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*(.plabel)
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*(.dynbss)
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||||||
|
*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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}
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. = ALIGN(4096);
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set_Xcommand_set : {
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||||||
|
__start_set_Xcommand_set = .;
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||||||
|
*(set_Xcommand_set)
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||||||
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__stop_set_Xcommand_set = .;
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||||||
|
}
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||||||
|
set_Xficl_compile_set : {
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||||||
|
__start_set_Xficl_compile_set = .;
|
||||||
|
*(set_Xficl_compile_set)
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||||||
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__stop_set_Xficl_compile_set = .;
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}
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. = ALIGN(4096);
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__gp = .;
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|
.sdata : {
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*(.got.plt .got)
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||||||
|
*(.sdata .sdata.* .gnu.linkonce.s.*)
|
||||||
|
*(dynsbss)
|
||||||
|
*(.sbss .sbss.* .gnu.linkonce.sb.*)
|
||||||
|
*(.scommon)
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}
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. = ALIGN(4096);
|
||||||
|
.dynamic : { *(.dynamic) }
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||||||
|
. = ALIGN(4096);
|
||||||
|
.rela.dyn : {
|
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|
*(.rela.data*)
|
||||||
|
*(.rela.got)
|
||||||
|
*(.rela.stab)
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||||||
|
*(.relaset_*)
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||||||
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}
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||||||
|
. = ALIGN(4096);
|
||||||
|
.reloc : { *(.reloc) }
|
||||||
|
. = ALIGN(4096);
|
||||||
|
.dynsym : { *(.dynsym) }
|
||||||
|
. = ALIGN(4096);
|
||||||
|
.dynstr : { *(.dynstr) }
|
||||||
|
}
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@ -0,0 +1,36 @@
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||||||
|
/*
|
||||||
|
* Copyright (c) 2022, Netflix, Inc.
|
||||||
|
*
|
||||||
|
* SPDX-License-Identifier: BSD-2-Clause
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Provides a _start routine that calls a _start_c routine that takes a pointer
|
||||||
|
* to the stack as documented in crt1.c. We skip the pointer to _DYNAMIC since
|
||||||
|
* we don't support dynamic libraries, at all. And while _start_c is our own
|
||||||
|
* thing and doesn't have a second arg, we comport to the calling conventions
|
||||||
|
* that glibc and musl have by passing x1 as 0 for the dynamic pointer. We
|
||||||
|
* likely could call main directly with only a few more lines of code, but this
|
||||||
|
* is simple enough and concentrates all the expressable in C stuff there. We
|
||||||
|
* also generate eh_frames should we need to debug things (it doesn't change the
|
||||||
|
* genreated code, but leaves enough breadcrumbs to keep gdb happy)
|
||||||
|
*/
|
||||||
|
|
||||||
|
__asm__(
|
||||||
|
".text\n" /* ENTRY(_start) -- can't expand and stringify, so by hand */
|
||||||
|
".align 2\n"
|
||||||
|
".global _start\n"
|
||||||
|
".type _start, #function\n"
|
||||||
|
"_start:\n"
|
||||||
|
".cfi_startproc\n"
|
||||||
|
/*
|
||||||
|
* Linux zeros all registers so x29 (frame pointer) and x30 (link register) are 0.
|
||||||
|
*/
|
||||||
|
" mov x0, sp\n" /* Pointer to argc, etc kernel left on the stack */
|
||||||
|
" and sp, x0, #-16\n" /* Align stack to 16-byte boundary */
|
||||||
|
" b _start_c\n" /* Our MI code takes it from here */
|
||||||
|
/* NORETURN */
|
||||||
|
".ltorg\n" /* END(_start) */
|
||||||
|
".cfi_endproc\n"
|
||||||
|
".size _start, .-_start\n"
|
||||||
|
);
|
||||||
|
|
@ -0,0 +1,29 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2005-2020 Rich Felker, et al.
|
||||||
|
*
|
||||||
|
* SPDX-License-Identifier: MIT
|
||||||
|
*
|
||||||
|
* Note: From the musl project
|
||||||
|
*/
|
||||||
|
|
||||||
|
struct host_kstat {
|
||||||
|
host_dev_t st_dev;
|
||||||
|
host_ino_t st_ino;
|
||||||
|
host_mode_t st_mode;
|
||||||
|
host_nlink_t st_nlink;
|
||||||
|
host_uid_t st_uid;
|
||||||
|
host_gid_t st_gid;
|
||||||
|
host_dev_t st_rdev;
|
||||||
|
unsigned long __pad;
|
||||||
|
host_off_t st_size;
|
||||||
|
host_blksize_t st_blksize;
|
||||||
|
int __pad2;
|
||||||
|
host_blkcnt_t st_blocks;
|
||||||
|
long st_atime_sec;
|
||||||
|
long st_atime_nsec;
|
||||||
|
long st_mtime_sec;
|
||||||
|
long st_mtime_nsec;
|
||||||
|
long st_ctime_sec;
|
||||||
|
long st_ctime_nsec;
|
||||||
|
unsigned __pad_for_future[2];
|
||||||
|
};
|
||||||
|
|
@ -0,0 +1,20 @@
|
||||||
|
#define SYS_close 57
|
||||||
|
#define SYS_dup 23
|
||||||
|
#define SYS_fstat 80
|
||||||
|
#define SYS_getdents64 61
|
||||||
|
#define SYS_getpid 172
|
||||||
|
#define SYS_gettimeofday 169
|
||||||
|
#define SYS_lseek 62
|
||||||
|
#define SYS_kexec_load 104
|
||||||
|
#define SYS_mkdirat 34
|
||||||
|
#define SYS_mmap 222
|
||||||
|
#define SYS_mount 40
|
||||||
|
#define SYS_munmap 215
|
||||||
|
#define SYS_newfstatat 79
|
||||||
|
#define SYS_openat 56
|
||||||
|
#define SYS_pselect6 72
|
||||||
|
#define SYS_read 63
|
||||||
|
#define SYS_reboot 142
|
||||||
|
#define SYS_symlinkat 36
|
||||||
|
#define SYS_uname 160
|
||||||
|
#define SYS_write 64
|
||||||
|
|
@ -0,0 +1,67 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2022, Netflix, Inc.
|
||||||
|
*
|
||||||
|
* SPDX-License-Identifier: BSD-2-Clause
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This is the trampoline that starts the FreeBSD kernel. Since the Linux kernel
|
||||||
|
* calls this routine with no args, and has a different environment than the boot
|
||||||
|
* loader provides and that the kernel expects, this code is responsible for setting
|
||||||
|
* all that up and calling the normal kernel entry point. It's analogous ot the
|
||||||
|
* "purgatory" code in the linux kernel. Details about these operations are
|
||||||
|
* contained in comments below. On aarch64, the kernel will start all the APs so
|
||||||
|
* we don't have to worry about them here.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Keep in sync with exec.c. Kexec starts aarch64_tramp w/o any
|
||||||
|
* parameters, so store them here.
|
||||||
|
*
|
||||||
|
* struct trampoline_data {
|
||||||
|
* uint64_t entry; // 0 (PA where kernel loaded)
|
||||||
|
* uint64_t modulep; // 8 module metadata
|
||||||
|
* };
|
||||||
|
*
|
||||||
|
* The aarch64 _start routine assumes:
|
||||||
|
* MMU on with an identity map, or off
|
||||||
|
* D-Cache: off
|
||||||
|
* I-Cache: on or off
|
||||||
|
* We are loaded at a 2MiB aligned address
|
||||||
|
* Module data (modulep) pointer in x0
|
||||||
|
*
|
||||||
|
* Unlike EFI, we don't support copying the staging area. We tell Linunx to land
|
||||||
|
* the kernel in its final location with the needed alignment, etc.
|
||||||
|
*
|
||||||
|
* This trampoline installs sets up the arguments the kernel expects, flushes
|
||||||
|
* the cache lines and jumps to the kernel _start address. We pass the modulep
|
||||||
|
* pointer in x0, as _start expects.
|
||||||
|
*/
|
||||||
|
.text
|
||||||
|
.globl aarch64_tramp
|
||||||
|
aarch64_tramp:
|
||||||
|
b 1f /* skip over our saved args */
|
||||||
|
.p2align 3
|
||||||
|
trampoline_data:
|
||||||
|
#define TRAMP_ENTRY 0
|
||||||
|
#define TRAMP_MODULEP 8
|
||||||
|
#define TRAMP_TOTAL 16
|
||||||
|
.space TRAMP_TOTAL
|
||||||
|
#define TMPSTACKSIZE 48 /* 16 bytes for args +8 for pushq/popfq + 24 spare */
|
||||||
|
1:
|
||||||
|
adr x2, trampoline_data
|
||||||
|
ldr x1, [x2, #TRAMP_ENTRY]
|
||||||
|
ldr x0, [x2, #TRAMP_MODULEP]
|
||||||
|
br x1
|
||||||
|
|
||||||
|
.p2align 4
|
||||||
|
.space TMPSTACKSIZE
|
||||||
|
aarch64_tramp_end: /* padding doubles as stack */
|
||||||
|
|
||||||
|
.data
|
||||||
|
.globl aarch64_tramp_size
|
||||||
|
aarch64_tramp_size:
|
||||||
|
.long aarch64_tramp_end-aarch64_tramp
|
||||||
|
.globl aarch64_tramp_data_offset
|
||||||
|
aarch64_tramp_data_offset:
|
||||||
|
.long trampoline_data-aarch64_tramp
|
||||||
|
|
@ -19,10 +19,15 @@ host_dup(int fd)
|
||||||
return host_syscall(SYS_dup, fd);
|
return host_syscall(SYS_dup, fd);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/* Same system call with different names on different Linux architectures due to history */
|
||||||
int
|
int
|
||||||
host_fstat(int fd, struct host_kstat *sb)
|
host_fstat(int fd, struct host_kstat *sb)
|
||||||
{
|
{
|
||||||
|
#ifdef SYS_newfstat
|
||||||
return host_syscall(SYS_newfstat, fd, (uintptr_t)sb);
|
return host_syscall(SYS_newfstat, fd, (uintptr_t)sb);
|
||||||
|
#else
|
||||||
|
return host_syscall(SYS_fstat, fd, (uintptr_t)sb);
|
||||||
|
#endif
|
||||||
}
|
}
|
||||||
|
|
||||||
int
|
int
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue