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loader: add API to load elf header

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Add an API to load an elf header header from a file. Populates a
buffer with the header contents, as well as a boolean for whether the
elf is 64b or not. Both arguments are optional.

Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: Fix typo in comment]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2016-03-04 11:30:21 +00:00 committed by Peter Maydell
parent e334bd3190
commit 04ae712a9f
2 changed files with 68 additions and 0 deletions
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55
hw/core/loader.c
View file

@ -354,6 +354,61 @@ const char *load_elf_strerror(int error)
}
}
void load_elf_hdr(const char *filename, void *hdr, bool *is64, Error **errp)
{
int fd;
uint8_t e_ident_local[EI_NIDENT];
uint8_t *e_ident;
size_t hdr_size, off;
bool is64l;
if (!hdr) {
hdr = e_ident_local;
}
e_ident = hdr;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
error_setg_errno(errp, errno, "Failed to open file: %s", filename);
return;
}
if (read(fd, hdr, EI_NIDENT) != EI_NIDENT) {
error_setg_errno(errp, errno, "Failed to read file: %s", filename);
goto fail;
}
if (e_ident[0] != ELFMAG0 ||
e_ident[1] != ELFMAG1 ||
e_ident[2] != ELFMAG2 ||
e_ident[3] != ELFMAG3) {
error_setg(errp, "Bad ELF magic");
goto fail;
}
is64l = e_ident[EI_CLASS] == ELFCLASS64;
hdr_size = is64l ? sizeof(Elf64_Ehdr) : sizeof(Elf32_Ehdr);
if (is64) {
*is64 = is64l;
}
off = EI_NIDENT;
while (hdr != e_ident_local && off < hdr_size) {
size_t br = read(fd, hdr + off, hdr_size - off);
switch (br) {
case 0:
error_setg(errp, "File too short: %s", filename);
goto fail;
case -1:
error_setg_errno(errp, errno, "Failed to read file: %s",
filename);
goto fail;
}
off += br;
}
fail:
close(fd);
}
/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,

13
include/hw/loader.h
View file

@ -48,6 +48,19 @@ int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, int big_endian, int elf_machine,
int clear_lsb);
/** load_elf_hdr:
* @filename: Path of ELF file
* @hdr: Buffer to populate with header data. Header data will not be
* filled if set to NULL.
* @is64: Set to true if the ELF is 64bit. Ignored if set to NULL
* @errp: Populated with an error in failure cases
*
* Inspect an ELF file's header. Read its full header contents into a
* buffer and/or determine if the ELF is 64bit.
*/
void load_elf_hdr(const char *filename, void *hdr, bool *is64, Error **errp);
int load_aout(const char *filename, hwaddr addr, int max_sz,
int bswap_needed, hwaddr target_page_size);
int load_uimage(const char *filename, hwaddr *ep,