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/*
* Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
* 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <sys/errno.h>
#include <stdint.h>
#include <stdio.h>
#include <ldo/ldo.h>
#include <ldo/file.h>
#include <ldo/elf.h>
#include <ldo/object.h>
#include <ldo/cdefs.h>
#include <lz4.h>
/*
* Too many defines for one arch, just simplify
* it and use __PPC64__, fucking hell.
*/
#if defined(__ppc64__) || defined(_ARCH_PPC64)
#if !defined(__PPC64__)
#define __PPC64__
#endif /* !defined(__PPC64__) */
#endif /* defined(__ppc64__) || ... */
static struct sarry_objq objq;
/*
* Machine string map, LDO machine defines
* are mapped one-to-one.
*/
static const char *machstrmap[] = {
[LDO_X86_64] = "x86_64",
[LDO_AARCH64] = "aarch64",
[LDO_PPC64] = "ppc64",
[LDO_UNKNOWN] = "unknown"
};
__always_inline
static inline const char *
ldo_machstr(ldo_mach_t type)
{
if (type > LDO_UNKNOWN)
type = LDO_UNKNOWN;
return machstrmap[type];
}
/*
* Returns an LDO machine type for the
* current platform.
*/
__always_inline static inline ldo_mach_t
getmach(void)
{
#if defined(__x86_64__) || defined(_M_X64)
return LDO_X86_64;
#elif defined(__aarch64__) || defined(_M_ARM64)
return LDO_AARCH64;
#elif defined(__PPC64__)
return LDO_PPC64;
#else
/* At this point bail the hell out */
printf("Unknown machine... please run machchk.sh\n");
return LDO_UNKNOWN;
#endif
}
/*
* Returns an LDO machine type for the target
* ELF platform.
*/
static inline ldo_mach_t
ldo_elf64_mach(const Elf64_Ehdr *eh)
{
switch (eh->e_machine) {
case EM_X86_64:
return LDO_X86_64;
case EM_AARCH64:
return LDO_X86_64;
case EM_PPC64:
return LDO_PPC64;
}
return LDO_UNKNOWN;
}
/*
* Perform preliminary checks on the ELF header
* and warn/error as needed.
*/
static inline int
ldo_elf64_chk(const Elf64_Ehdr *eh)
{
ldo_mach_t target, current;
const char *tstr, *cstr;
/* Ensure magic is correct */
if (eh->e_ident[EI_MAG0] != ELFMAG0)
return -ENOEXEC;
if (eh->e_ident[EI_MAG1] != ELFMAG1)
return -ENOEXEC;
if (eh->e_ident[EI_MAG2] != ELFMAG2)
return -ENOEXEC;
if (eh->e_ident[EI_MAG3] != ELFMAG3)
return -ENOEXEC;
target = ldo_elf64_mach(eh);
current = ldo_elf64_mach(eh);
tstr = ldo_machstr(target);
cstr = ldo_machstr(current);
vlog("target=%s, current=%s\n", tstr, cstr);
if (target != current) {
fprintf(stdout, "warn: target %s will not run on %s\n", tstr, cstr);
}
return 0;
}
void
ldo_load(const char *pathname)
{
Elf64_Ehdr *eh;
struct ldo_file *lfp;
int err;
if ((lfp = ldo_open(pathname, O_RDONLY)) == NULL) {
fprintf(stderr, "ldo_load: failed to open \"%s\"\n", pathname);
return;
}
eh = (Elf64_Ehdr *)LDO_BUFSTREAM(lfp->data);
err = ldo_elf64_chk(eh);
/* Make sure our checks went fine */
if (err == -ENOEXEC) {
fprintf(stderr, "ldo_load: bad magic for \"%s\"\n", pathname);
return;
}
if (err < 0) {
fprintf(stderr, "ldo_load: failed to load obj (retval=%d)\n", err);
return;
}
vlog("entrypoint=0x%llx\n", eh->e_entry);
vlog("program headers: %d\n", eh->e_phnum);
vlog("section headers: %d\n", eh->e_shnum);
ldo_close(lfp);
}
int
ldo_init(void)
{
vlog("Initializing object queue...\n");
return sarry_init_objq(&objq, OBJQ_CAP);
}
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