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authorPeter Crosthwaite <crosthwaitepeter@gmail.com>2016-03-04 11:30:21 +0000
committerPeter Maydell <peter.maydell@linaro.org>2016-03-04 11:30:21 +0000
commit04ae712a9f31fe21eacfcaeb689c7e6d0a7e251c (patch)
treecef357793fb382ff6efb6ff9a69b0e087ec7da75 /hw/core
parente334bd3190f6c4ca12f1d40d316dc471c70009ab (diff)
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>
Diffstat (limited to 'hw/core')
-rw-r--r--hw/core/loader.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 260b3d62cb..125aa05de6 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,