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[Qemu-devel] [PATCH v2 15/18] loader: add API to load elf header
From: |
Peter Crosthwaite |
Subject: |
[Qemu-devel] [PATCH v2 15/18] loader: add API to load elf header |
Date: |
Tue, 1 Mar 2016 22:56:19 -0800 |
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 <address@hidden>
---
Changed since v1 (PMM review):
Add filname to error messages
Remove unneeded lseek()
Add doc comment
hw/core/loader.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
include/hw/loader.h | 13 +++++++++++++
2 files changed, 68 insertions(+)
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 3a57415..7d5e3a9 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -332,6 +332,61 @@ 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 f7b43ab..a626c9b 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -36,6 +36,19 @@ 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 as 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,
--
1.9.1
- [Qemu-devel] [PATCH v2 05/18] arm: cpu: handle BE32 user-mode as BE, (continued)
- [Qemu-devel] [PATCH v2 05/18] arm: cpu: handle BE32 user-mode as BE, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 06/18] linux-user: arm: set CPSR.E/SCTLR.E0E correctly for BE mode, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 07/18] linux-user: arm: handle CPSR.E correctly in strex emulation, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 08/18] target-arm: implement SCTLR.EE, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 10/18] target-arm: introduce disas flag for endianness, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 09/18] target-arm: pass DisasContext to gen_aa32_ld*/st*, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 11/18] target-arm: a64: Add endianness support, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 12/18] target-arm: introduce tbflag for endianness, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 13/18] target-arm: implement setend, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 15/18] loader: add API to load elf header,
Peter Crosthwaite <=
- [Qemu-devel] [PATCH v2 16/18] loader: load_elf(): Add doc comment, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 17/18] loader: Add data swap option to load-elf, Peter Crosthwaite, 2016/03/02
- [Qemu-devel] [PATCH v2 18/18] arm: boot: Support big-endian elfs, Peter Crosthwaite, 2016/03/02
- Re: [Qemu-devel] [PATCH v2 00/18] ARM big-endian and setend support, Peter Maydell, 2016/03/03
- Message not available