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+/*
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+ * Copyright 2015 Mentor Graphics Corporation.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; version 2 of the
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+ * License.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ *
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+ * vdsomunge - Host program which produces a shared object
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+ * architecturally specified to be usable by both soft- and hard-float
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+ * programs.
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+ *
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+ * The Procedure Call Standard for the ARM Architecture (ARM IHI
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+ * 0042E) says:
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+ *
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+ * 6.4.1 VFP and Base Standard Compatibility
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+ *
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+ * Code compiled for the VFP calling standard is compatible with
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+ * the base standard (and vice-versa) if no floating-point or
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+ * containerized vector arguments or results are used.
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+ *
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+ * And ELF for the ARM Architecture (ARM IHI 0044E) (Table 4-2) says:
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+ *
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+ * If both EF_ARM_ABI_FLOAT_XXXX bits are clear, conformance to the
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+ * base procedure-call standard is implied.
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+ *
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+ * The VDSO is built with -msoft-float, as with the rest of the ARM
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+ * kernel, and uses no floating point arguments or results. The build
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+ * process will produce a shared object that may or may not have the
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+ * EF_ARM_ABI_FLOAT_SOFT flag set (it seems to depend on the binutils
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+ * version; binutils starting with 2.24 appears to set it). The
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+ * EF_ARM_ABI_FLOAT_HARD flag should definitely not be set, and this
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+ * program will error out if it is.
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+ *
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+ * If the soft-float flag is set, this program clears it. That's all
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+ * it does.
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+ */
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+
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+#define _GNU_SOURCE
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+
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+#include <byteswap.h>
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+#include <elf.h>
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+#include <errno.h>
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+#include <error.h>
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+#include <fcntl.h>
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+#include <stdbool.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <sys/mman.h>
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+#include <sys/stat.h>
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+#include <sys/types.h>
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+#include <unistd.h>
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+
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+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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+#define HOST_ORDER ELFDATA2LSB
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+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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+#define HOST_ORDER ELFDATA2MSB
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+#endif
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+
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+/* Some of the ELF constants we'd like to use were added to <elf.h>
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+ * relatively recently.
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+ */
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+#ifndef EF_ARM_EABI_VER5
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+#define EF_ARM_EABI_VER5 0x05000000
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+#endif
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+
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+#ifndef EF_ARM_ABI_FLOAT_SOFT
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+#define EF_ARM_ABI_FLOAT_SOFT 0x200
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+#endif
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+
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+#ifndef EF_ARM_ABI_FLOAT_HARD
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+#define EF_ARM_ABI_FLOAT_HARD 0x400
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+#endif
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+
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+static const char *outfile;
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+
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+static void cleanup(void)
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+{
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+ if (error_message_count > 0 && outfile != NULL)
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+ unlink(outfile);
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+}
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+
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+static Elf32_Word read_elf_word(Elf32_Word word, bool swap)
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+{
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+ return swap ? bswap_32(word) : word;
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+}
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+
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+static Elf32_Half read_elf_half(Elf32_Half half, bool swap)
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+{
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+ return swap ? bswap_16(half) : half;
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+}
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+
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+static void write_elf_word(Elf32_Word val, Elf32_Word *dst, bool swap)
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+{
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+ *dst = swap ? bswap_32(val) : val;
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+}
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+
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+int main(int argc, char **argv)
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+{
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+ const Elf32_Ehdr *inhdr;
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+ bool clear_soft_float;
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+ const char *infile;
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+ Elf32_Word e_flags;
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+ const void *inbuf;
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+ struct stat stat;
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+ void *outbuf;
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+ bool swap;
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+ int outfd;
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+ int infd;
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+
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+ atexit(cleanup);
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+
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+ if (argc != 3)
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+ error(EXIT_FAILURE, 0, "Usage: %s [infile] [outfile]", argv[0]);
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+
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+ infile = argv[1];
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+ outfile = argv[2];
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+
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+ infd = open(infile, O_RDONLY);
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+ if (infd < 0)
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+ error(EXIT_FAILURE, errno, "Cannot open %s", infile);
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+
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+ if (fstat(infd, &stat) != 0)
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+ error(EXIT_FAILURE, errno, "Failed stat for %s", infile);
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+
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+ inbuf = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, infd, 0);
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+ if (inbuf == MAP_FAILED)
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+ error(EXIT_FAILURE, errno, "Failed to map %s", infile);
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+
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+ close(infd);
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+
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+ inhdr = inbuf;
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+
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+ if (memcmp(&inhdr->e_ident, ELFMAG, SELFMAG) != 0)
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+ error(EXIT_FAILURE, 0, "Not an ELF file");
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+
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+ if (inhdr->e_ident[EI_CLASS] != ELFCLASS32)
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+ error(EXIT_FAILURE, 0, "Unsupported ELF class");
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+
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+ swap = inhdr->e_ident[EI_DATA] != HOST_ORDER;
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+
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+ if (read_elf_half(inhdr->e_type, swap) != ET_DYN)
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+ error(EXIT_FAILURE, 0, "Not a shared object");
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+
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+ if (read_elf_half(inhdr->e_machine, swap) != EM_ARM) {
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+ error(EXIT_FAILURE, 0, "Unsupported architecture %#x",
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+ inhdr->e_machine);
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+ }
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+
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+ e_flags = read_elf_word(inhdr->e_flags, swap);
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+
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+ if (EF_ARM_EABI_VERSION(e_flags) != EF_ARM_EABI_VER5) {
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+ error(EXIT_FAILURE, 0, "Unsupported EABI version %#x",
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+ EF_ARM_EABI_VERSION(e_flags));
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+ }
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+
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+ if (e_flags & EF_ARM_ABI_FLOAT_HARD)
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+ error(EXIT_FAILURE, 0,
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+ "Unexpected hard-float flag set in e_flags");
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+
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+ clear_soft_float = !!(e_flags & EF_ARM_ABI_FLOAT_SOFT);
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+
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+ outfd = open(outfile, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
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+ if (outfd < 0)
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+ error(EXIT_FAILURE, errno, "Cannot open %s", outfile);
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+
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+ if (ftruncate(outfd, stat.st_size) != 0)
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+ error(EXIT_FAILURE, errno, "Cannot truncate %s", outfile);
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+
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+ outbuf = mmap(NULL, stat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
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+ outfd, 0);
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+ if (outbuf == MAP_FAILED)
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+ error(EXIT_FAILURE, errno, "Failed to map %s", outfile);
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+
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+ close(outfd);
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+
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+ memcpy(outbuf, inbuf, stat.st_size);
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+
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+ if (clear_soft_float) {
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+ Elf32_Ehdr *outhdr;
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+
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+ outhdr = outbuf;
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+ e_flags &= ~EF_ARM_ABI_FLOAT_SOFT;
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+ write_elf_word(e_flags, &outhdr->e_flags, swap);
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+ }
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+
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+ if (msync(outbuf, stat.st_size, MS_SYNC) != 0)
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+ error(EXIT_FAILURE, errno, "Failed to sync %s", outfile);
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+
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+ return EXIT_SUCCESS;
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+}
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Nathan Lynch