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.pe...@gmail.com>
---
hw/core/loader.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
include/hw/loader.h | 1 +
2 files changed, 49 insertions(+)
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 6b69852..28da8e2 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -331,6 +331,54 @@ 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[EI_NIDENT];
+ size_t hdr_size, off = 0;
+ bool is64l;
+
+ fd = open(filename, O_RDONLY | O_BINARY);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "Fail to open file");
+ return;
+ }
+ if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) {
+ error_setg_errno(errp, errno, "Fail to read file");
+ 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;
+ }
+
+ lseek(fd, 0, SEEK_SET);
+ while (hdr && off < hdr_size) {
+ size_t br = read(fd, hdr + off, hdr_size - off);
+ switch (br) {
+ case 0:
+ error_setg(errp, "File too short");
+ goto fail;
+ case -1:
+ error_setg_errno(errp, errno, "Failed to read file");
+ 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 f7b43ab..33067f8 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -36,6 +36,7 @@ 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);
+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,
--
1.9.1
