freebsd-dev/stand/common/bootstrap.h
Kyle Evans d3d381b2b1 userboot: handle guest interpreter mismatches more intelligently
The switch to lualoader creates a problem with userboot: the host is
inclined to build userboot with Lua, but the host userboot's interpreter
must match what's available on the guest. For almost all FreeBSD guests in
the wild, Lua is not yet available and a Lua-based userboot will fail.

This revision updates userboot protocol to version 5, which adds a
swap_interpreter callback to request a different interpreter, and tries to
determine the proper interpreter to be used based on how the guest
/boot/loader is compiled. This is still a bit of a guess, but it's likely
the best possible guess we can make in order to get it right. The
interpreter is now embedded in the resulting executable, so we can open
/boot/loader on the guest and hunt that down to derive the interpreter it
was built with.

Using -l with bhyveload will not allow an intepreter swap, even if the
loader specified happens to be a userboot with the wrong interpreter. We'll
simply complain about the mismatch and bail out.

For legacy guests without the interpreter marker, we assume they're 4th.
For new guests with the interpreter marker, we'll read it and swap over
to the proper interpreter if it doesn't match what the userboot we're using
was compiled with.

Both flavors of userboot are installed by default, userboot_4th.so and
userboot_lua.so. This fixes the build WITHOUT_FORTH as a coincidence, which
was broken by userboot being forced to 4th.

Reviewed by:	imp, jhb, araujo (earlier version)
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D16945
2018-09-01 02:23:45 +00:00

350 lines
11 KiB
C

/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* 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 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.
*
* $FreeBSD$
*/
#ifndef _BOOTSTRAP_H_
#define _BOOTSTRAP_H_
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/linker_set.h>
/* Commands and return values; nonzero return sets command_errmsg != NULL */
typedef int (bootblk_cmd_t)(int argc, char *argv[]);
#define COMMAND_ERRBUFSZ (256)
extern const char *command_errmsg;
extern char command_errbuf[COMMAND_ERRBUFSZ];
#define CMD_OK 0
#define CMD_WARN 1
#define CMD_ERROR 2
#define CMD_CRIT 3
#define CMD_FATAL 4
/* interp.c */
void interact(void);
void interp_emit_prompt(void);
int interp_builtin_cmd(int argc, char *argv[]);
/* Called by interp.c for interp_*.c embedded interpreters */
int interp_include(const char *filename); /* Execute commands from filename */
void interp_init(void); /* Initialize interpreater */
int interp_run(const char *line); /* Run a single command */
/* interp_backslash.c */
char *backslash(const char *str);
/* interp_parse.c */
int parse(int *argc, char ***argv, const char *str);
/* boot.c */
void autoboot_maybe(void);
int getrootmount(char *rootdev);
/* misc.c */
char *unargv(int argc, char *argv[]);
void hexdump(caddr_t region, size_t len);
size_t strlenout(vm_offset_t str);
char *strdupout(vm_offset_t str);
void kern_bzero(vm_offset_t dest, size_t len);
int kern_pread(int fd, vm_offset_t dest, size_t len, off_t off);
void *alloc_pread(int fd, off_t off, size_t len);
/* bcache.c */
void bcache_init(size_t nblks, size_t bsize);
void bcache_add_dev(int);
void *bcache_allocate(void);
void bcache_free(void *);
int bcache_strategy(void *devdata, int rw, daddr_t blk, size_t size,
char *buf, size_t *rsize);
/*
* Disk block cache
*/
struct bcache_devdata
{
int (*dv_strategy)(void *devdata, int rw, daddr_t blk,
size_t size, char *buf, size_t *rsize);
void *dv_devdata;
void *dv_cache;
};
/*
* Modular console support.
*/
struct console
{
const char *c_name;
const char *c_desc;
int c_flags;
#define C_PRESENTIN (1<<0) /* console can provide input */
#define C_PRESENTOUT (1<<1) /* console can provide output */
#define C_ACTIVEIN (1<<2) /* user wants input from console */
#define C_ACTIVEOUT (1<<3) /* user wants output to console */
#define C_WIDEOUT (1<<4) /* c_out routine groks wide chars */
void (* c_probe)(struct console *cp); /* set c_flags to match hardware */
int (* c_init)(int arg); /* reinit XXX may need more args */
void (* c_out)(int c); /* emit c */
int (* c_in)(void); /* wait for and return input */
int (* c_ready)(void); /* return nonzer if input waiting */
};
extern struct console *consoles[];
void cons_probe(void);
/*
* Plug-and-play enumerator/configurator interface.
*/
struct pnphandler
{
const char *pp_name; /* handler/bus name */
void (* pp_enumerate)(void); /* enumerate PnP devices, add to chain */
};
struct pnpident
{
char *id_ident; /* ASCII identifier, actual format varies with bus/handler */
STAILQ_ENTRY(pnpident) id_link;
};
struct pnpinfo
{
char *pi_desc; /* ASCII description, optional */
int pi_revision; /* optional revision (or -1) if not supported */
char *pi_module; /* module/args nominated to handle device */
int pi_argc; /* module arguments */
char **pi_argv;
struct pnphandler *pi_handler; /* handler which detected this device */
STAILQ_HEAD(,pnpident) pi_ident; /* list of identifiers */
STAILQ_ENTRY(pnpinfo) pi_link;
};
STAILQ_HEAD(pnpinfo_stql, pnpinfo);
extern struct pnphandler *pnphandlers[]; /* provided by MD code */
void pnp_addident(struct pnpinfo *pi, char *ident);
struct pnpinfo *pnp_allocinfo(void);
void pnp_freeinfo(struct pnpinfo *pi);
void pnp_addinfo(struct pnpinfo *pi);
char *pnp_eisaformat(uint8_t *data);
/*
* < 0 - No ISA in system
* == 0 - Maybe ISA, search for read data port
* > 0 - ISA in system, value is read data port address
*/
extern int isapnp_readport;
/*
* Version information
*/
extern char bootprog_info[];
/*
* Interpreter information
*/
extern const char bootprog_interp[];
#define INTERP_DEFINE(interpstr) \
const char bootprog_interp[] = "$Interpreter:" interpstr
/*
* Preloaded file metadata header.
*
* Metadata are allocated on our heap, and copied into kernel space
* before executing the kernel.
*/
struct file_metadata
{
size_t md_size;
uint16_t md_type;
struct file_metadata *md_next;
char md_data[1]; /* data are immediately appended */
};
struct preloaded_file;
struct mod_depend;
struct kernel_module
{
char *m_name; /* module name */
int m_version; /* module version */
/* char *m_args;*/ /* arguments for the module */
struct preloaded_file *m_fp;
struct kernel_module *m_next;
};
/*
* Preloaded file information. Depending on type, file can contain
* additional units called 'modules'.
*
* At least one file (the kernel) must be loaded in order to boot.
* The kernel is always loaded first.
*
* String fields (m_name, m_type) should be dynamically allocated.
*/
struct preloaded_file
{
char *f_name; /* file name */
char *f_type; /* verbose file type, eg 'ELF kernel', 'pnptable', etc. */
char *f_args; /* arguments for the file */
struct file_metadata *f_metadata; /* metadata that will be placed in the module directory */
int f_loader; /* index of the loader that read the file */
vm_offset_t f_addr; /* load address */
size_t f_size; /* file size */
struct kernel_module *f_modules; /* list of modules if any */
struct preloaded_file *f_next; /* next file */
};
struct file_format
{
/* Load function must return EFTYPE if it can't handle the module supplied */
int (* l_load)(char *filename, uint64_t dest, struct preloaded_file **result);
/* Only a loader that will load a kernel (first module) should have an exec handler */
int (* l_exec)(struct preloaded_file *mp);
};
extern struct file_format *file_formats[]; /* supplied by consumer */
extern struct preloaded_file *preloaded_files;
int mod_load(char *name, struct mod_depend *verinfo, int argc, char *argv[]);
int mod_loadkld(const char *name, int argc, char *argv[]);
void unload(void);
struct preloaded_file *file_alloc(void);
struct preloaded_file *file_findfile(const char *name, const char *type);
struct file_metadata *file_findmetadata(struct preloaded_file *fp, int type);
struct preloaded_file *file_loadraw(const char *name, char *type, int insert);
void file_discard(struct preloaded_file *fp);
void file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p);
int file_addmodule(struct preloaded_file *fp, char *modname, int version,
struct kernel_module **newmp);
void file_removemetadata(struct preloaded_file *fp);
/* MI module loaders */
#ifdef __elfN
/* Relocation types. */
#define ELF_RELOC_REL 1
#define ELF_RELOC_RELA 2
/* Relocation offset for some architectures */
extern uint64_t __elfN(relocation_offset);
struct elf_file;
typedef Elf_Addr (symaddr_fn)(struct elf_file *ef, Elf_Size symidx);
int __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result);
int __elfN(obj_loadfile)(char *filename, uint64_t dest,
struct preloaded_file **result);
int __elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr,
const void *reldata, int reltype, Elf_Addr relbase,
Elf_Addr dataaddr, void *data, size_t len);
int __elfN(loadfile_raw)(char *filename, uint64_t dest,
struct preloaded_file **result, int multiboot);
int __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest);
#endif
/*
* Support for commands
*/
struct bootblk_command
{
const char *c_name;
const char *c_desc;
bootblk_cmd_t *c_fn;
};
#define COMMAND_SET(tag, key, desc, func) \
static bootblk_cmd_t func; \
static struct bootblk_command _cmd_ ## tag = { key, desc, func }; \
DATA_SET(Xcommand_set, _cmd_ ## tag)
SET_DECLARE(Xcommand_set, struct bootblk_command);
/*
* The intention of the architecture switch is to provide a convenient
* encapsulation of the interface between the bootstrap MI and MD code.
* MD code may selectively populate the switch at runtime based on the
* actual configuration of the target system.
*/
struct arch_switch
{
/* Automatically load modules as required by detected hardware */
int (*arch_autoload)(void);
/* Locate the device for (name), return pointer to tail in (*path) */
int (*arch_getdev)(void **dev, const char *name, const char **path);
/* Copy from local address space to module address space, similar to bcopy() */
ssize_t (*arch_copyin)(const void *src, vm_offset_t dest,
const size_t len);
/* Copy to local address space from module address space, similar to bcopy() */
ssize_t (*arch_copyout)(const vm_offset_t src, void *dest,
const size_t len);
/* Read from file to module address space, same semantics as read() */
ssize_t (*arch_readin)(const int fd, vm_offset_t dest,
const size_t len);
/* Perform ISA byte port I/O (only for systems with ISA) */
int (*arch_isainb)(int port);
void (*arch_isaoutb)(int port, int value);
/*
* Interface to adjust the load address according to the "object"
* being loaded.
*/
uint64_t (*arch_loadaddr)(u_int type, void *data, uint64_t addr);
#define LOAD_ELF 1 /* data points to the ELF header. */
#define LOAD_RAW 2 /* data points to the file name. */
/*
* Interface to inform MD code about a loaded (ELF) segment. This
* can be used to flush caches and/or set up translations.
*/
#ifdef __elfN
void (*arch_loadseg)(Elf_Ehdr *eh, Elf_Phdr *ph, uint64_t delta);
#else
void (*arch_loadseg)(void *eh, void *ph, uint64_t delta);
#endif
/* Probe ZFS pool(s), if needed. */
void (*arch_zfs_probe)(void);
/* For kexec-type loaders, get ksegment structure */
void (*arch_kexec_kseg_get)(int *nseg, void **kseg);
};
extern struct arch_switch archsw;
/* This must be provided by the MD code, but should it be in the archsw? */
void delay(int delay);
void dev_cleanup(void);
time_t time(time_t *tloc);
#ifndef CTASSERT
#define CTASSERT(x) _Static_assert(x, "compile-time assertion failed")
#endif
#endif /* !_BOOTSTRAP_H_ */