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author | Peter Crosthwaite <crosthwaitepeter@gmail.com> | 2016-03-04 11:30:21 +0000 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-11-29 19:49:12 -0600 |
commit | b4d8a6170705a82cf4ed6a2bccd50fc1ae849d94 (patch) | |
tree | 28d3823e73984fb489889e34bd89a21fd75ad0fb | |
parent | b94b92980f76ec7cbf93b69b26c6865a19b5b3c5 (diff) | |
download | hqemu-b4d8a6170705a82cf4ed6a2bccd50fc1ae849d94.zip hqemu-b4d8a6170705a82cf4ed6a2bccd50fc1ae849d94.tar.gz |
loader: add API to load elf header
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>
-rw-r--r-- | hw/core/loader.c | 55 | ||||
-rw-r--r-- | include/hw/loader.h | 13 |
2 files changed, 68 insertions, 0 deletions
diff --git a/hw/core/loader.c b/hw/core/loader.c index 260b3d6..125aa05 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -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, diff --git a/include/hw/loader.h b/include/hw/loader.h index 09c3764..358da55 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -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, |