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ARM: 8397/1: fix vdsomunge not to depend on glibc specific error.h

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If the host toolchain is not glibc based then the arm kernel build
fails with

 arch/arm/vdso/vdsomunge.c:53:19: fatal error: error.h: No such file or directory

error.h is a glibc only header (ie not available in musl, newlib and
bsd libcs).  Changed the error reporting to standard conforming code
to avoid depending on specific C implementations.

Signed-off-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Fixes: 8512287a81 ("ARM: 8330/1: add VDSO user-space code")
Cc: stable@vger.kernel.org
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Szabolcs Nagy 2015-07-01 23:08:10 +01:00 committed by Russell King
parent eeb3fee8f6
commit 13ee9fdba9
1 changed files with 33 additions and 23 deletions
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56
arch/arm/vdso/vdsomunge.c
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@ -45,13 +45,11 @@
* it does.
*/
#define _GNU_SOURCE
#include <byteswap.h>
#include <elf.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@ -82,11 +80,25 @@
#define EF_ARM_ABI_FLOAT_HARD 0x400
#endif
static int failed;
static const char *argv0;
static const char *outfile;
static void fail(const char *fmt, ...)
{
va_list ap;
failed = 1;
fprintf(stderr, "%s: ", argv0);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
static void cleanup(void)
{
if (error_message_count > 0 && outfile != NULL)
if (failed && outfile != NULL)
unlink(outfile);
}
@ -119,68 +131,66 @@ int main(int argc, char **argv)
int infd;
atexit(cleanup);
argv0 = argv[0];
if (argc != 3)
error(EXIT_FAILURE, 0, "Usage: %s [infile] [outfile]", argv[0]);
fail("Usage: %s [infile] [outfile]\n", argv[0]);
infile = argv[1];
outfile = argv[2];
infd = open(infile, O_RDONLY);
if (infd < 0)
error(EXIT_FAILURE, errno, "Cannot open %s", infile);
fail("Cannot open %s: %s\n", infile, strerror(errno));
if (fstat(infd, &stat) != 0)
error(EXIT_FAILURE, errno, "Failed stat for %s", infile);
fail("Failed stat for %s: %s\n", infile, strerror(errno));
inbuf = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, infd, 0);
if (inbuf == MAP_FAILED)
error(EXIT_FAILURE, errno, "Failed to map %s", infile);
fail("Failed to map %s: %s\n", infile, strerror(errno));
close(infd);
inhdr = inbuf;
if (memcmp(&inhdr->e_ident, ELFMAG, SELFMAG) != 0)
error(EXIT_FAILURE, 0, "Not an ELF file");
fail("Not an ELF file\n");
if (inhdr->e_ident[EI_CLASS] != ELFCLASS32)
error(EXIT_FAILURE, 0, "Unsupported ELF class");
fail("Unsupported ELF class\n");
swap = inhdr->e_ident[EI_DATA] != HOST_ORDER;
if (read_elf_half(inhdr->e_type, swap) != ET_DYN)
error(EXIT_FAILURE, 0, "Not a shared object");
fail("Not a shared object\n");
if (read_elf_half(inhdr->e_machine, swap) != EM_ARM) {
error(EXIT_FAILURE, 0, "Unsupported architecture %#x",
inhdr->e_machine);
}
if (read_elf_half(inhdr->e_machine, swap) != EM_ARM)
fail("Unsupported architecture %#x\n", inhdr->e_machine);
e_flags = read_elf_word(inhdr->e_flags, swap);
if (EF_ARM_EABI_VERSION(e_flags) != EF_ARM_EABI_VER5) {
error(EXIT_FAILURE, 0, "Unsupported EABI version %#x",
EF_ARM_EABI_VERSION(e_flags));
fail("Unsupported EABI version %#x\n",
EF_ARM_EABI_VERSION(e_flags));
}
if (e_flags & EF_ARM_ABI_FLOAT_HARD)
error(EXIT_FAILURE, 0,
"Unexpected hard-float flag set in e_flags");
fail("Unexpected hard-float flag set in e_flags\n");
clear_soft_float = !!(e_flags & EF_ARM_ABI_FLOAT_SOFT);
outfd = open(outfile, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
if (outfd < 0)
error(EXIT_FAILURE, errno, "Cannot open %s", outfile);
fail("Cannot open %s: %s\n", outfile, strerror(errno));
if (ftruncate(outfd, stat.st_size) != 0)
error(EXIT_FAILURE, errno, "Cannot truncate %s", outfile);
fail("Cannot truncate %s: %s\n", outfile, strerror(errno));
outbuf = mmap(NULL, stat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
outfd, 0);
if (outbuf == MAP_FAILED)
error(EXIT_FAILURE, errno, "Failed to map %s", outfile);
fail("Failed to map %s: %s\n", outfile, strerror(errno));
close(outfd);
@ -195,7 +205,7 @@ int main(int argc, char **argv)
}
if (msync(outbuf, stat.st_size, MS_SYNC) != 0)
error(EXIT_FAILURE, errno, "Failed to sync %s", outfile);
fail("Failed to sync %s: %s\n", outfile, strerror(errno));
return EXIT_SUCCESS;
}