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x86/vdso, build: When vdso2c fails, unlink the output

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This avoids bizarre failures if make is run again.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/1764385fe9931e8940b9d001132515448ea89523.1401464755.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andy Lutomirski 2014-05-30 08:48:48 -07:00 committed by H. Peter Anvin
parent 94aca80897
commit 011561837d
2 changed files with 14 additions and 16 deletions
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20
arch/x86/vdso/vdso2c.c
View file

@ -14,6 +14,8 @@
#include <linux/elf.h>
#include <linux/types.h>
const char *outfilename;
/* Symbols that we need in vdso2c. */
enum {
sym_vvar_page,
@ -44,6 +46,7 @@ static void fail(const char *format, ...)
va_start(ap, format);
fprintf(stderr, "Error: ");
vfprintf(stderr, format, ap);
unlink(outfilename);
exit(1);
va_end(ap);
}
@ -82,17 +85,16 @@ static void fail(const char *format, ...)
#undef Elf_Sym
#undef Elf_Dyn
static int go(void *addr, size_t len, FILE *outfile, const char *name)
static void go(void *addr, size_t len, FILE *outfile, const char *name)
{
Elf64_Ehdr *hdr = (Elf64_Ehdr *)addr;
if (hdr->e_ident[EI_CLASS] == ELFCLASS64) {
return go64(addr, len, outfile, name);
go64(addr, len, outfile, name);
} else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) {
return go32(addr, len, outfile, name);
go32(addr, len, outfile, name);
} else {
fprintf(stderr, "Error: unknown ELF class\n");
return 1;
fail("unknown ELF class\n");
}
}
@ -102,7 +104,6 @@ int main(int argc, char **argv)
off_t len;
void *addr;
FILE *outfile;
int ret;
char *name, *tmp;
int namelen;
@ -143,14 +144,15 @@ int main(int argc, char **argv)
if (addr == MAP_FAILED)
err(1, "mmap");
outfile = fopen(argv[2], "w");
outfilename = argv[2];
outfile = fopen(outfilename, "w");
if (!outfile)
err(1, "%s", argv[2]);
ret = go(addr, (size_t)len, outfile, name);
go(addr, (size_t)len, outfile, name);
munmap(addr, len);
fclose(outfile);
return ret;
return 0;
}

10
arch/x86/vdso/vdso2c.h
View file

@ -4,7 +4,7 @@
* are built for 32-bit userspace.
*/
static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
{
int found_load = 0;
unsigned long load_size = -1; /* Work around bogus warning */
@ -62,10 +62,8 @@ static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
alt_sec = sh;
}
if (!symtab_hdr) {
if (!symtab_hdr)
fail("no symbol table\n");
return 1;
}
strtab_hdr = addr + hdr->e_shoff +
hdr->e_shentsize * symtab_hdr->sh_link;
@ -112,7 +110,7 @@ static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
if (!name) {
fwrite(addr, load_size, 1, outfile);
return 0;
return;
}
fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n");
@ -152,6 +150,4 @@ static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
required_syms[i], syms[i]);
}
fprintf(outfile, "};\n");
return 0;
}