Commit ed81e780 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 vdso build fix from Peter Anvin:
 "This fixes building the vdso code on older Linux systems, and probably
  some non-Linux systems"

* 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, vdso: Use <tools/le_byteshift.h> for littleendian access
parents 3f17ea6d bdfb9bcc
...@@ -59,6 +59,7 @@ VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ ...@@ -59,6 +59,7 @@ VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
$(call if_changed,vdso) $(call if_changed,vdso)
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
hostprogs-y += vdso2c hostprogs-y += vdso2c
quiet_cmd_vdso2c = VDSO2C $@ quiet_cmd_vdso2c = VDSO2C $@
......
...@@ -11,6 +11,8 @@ ...@@ -11,6 +11,8 @@
#include <sys/mman.h> #include <sys/mman.h>
#include <sys/types.h> #include <sys/types.h>
#include <tools/le_byteshift.h>
#include <linux/elf.h> #include <linux/elf.h>
#include <linux/types.h> #include <linux/types.h>
...@@ -56,12 +58,12 @@ static void fail(const char *format, ...) ...@@ -56,12 +58,12 @@ static void fail(const char *format, ...)
*/ */
#define GLE(x, bits, ifnot) \ #define GLE(x, bits, ifnot) \
__builtin_choose_expr( \ __builtin_choose_expr( \
(sizeof(x) == bits/8), \ (sizeof(*(x)) == bits/8), \
(__typeof__(x))le##bits##toh(x), ifnot) (__typeof__(*(x)))get_unaligned_le##bits(x), ifnot)
extern void bad_get_le(uint64_t); extern void bad_get_le(void);
#define LAST_LE(x) \ #define LAST_LE(x) \
__builtin_choose_expr(sizeof(x) == 1, (x), bad_get_le(x)) __builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le())
#define GET_LE(x) \ #define GET_LE(x) \
GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_LE(x)))) GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_LE(x))))
......
...@@ -18,27 +18,27 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name) ...@@ -18,27 +18,27 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
const char *secstrings; const char *secstrings;
uint64_t syms[NSYMS] = {}; uint64_t syms[NSYMS] = {};
Elf_Phdr *pt = (Elf_Phdr *)(addr + GET_LE(hdr->e_phoff)); Elf_Phdr *pt = (Elf_Phdr *)(addr + GET_LE(&hdr->e_phoff));
/* Walk the segment table. */ /* Walk the segment table. */
for (i = 0; i < GET_LE(hdr->e_phnum); i++) { for (i = 0; i < GET_LE(&hdr->e_phnum); i++) {
if (GET_LE(pt[i].p_type) == PT_LOAD) { if (GET_LE(&pt[i].p_type) == PT_LOAD) {
if (found_load) if (found_load)
fail("multiple PT_LOAD segs\n"); fail("multiple PT_LOAD segs\n");
if (GET_LE(pt[i].p_offset) != 0 || if (GET_LE(&pt[i].p_offset) != 0 ||
GET_LE(pt[i].p_vaddr) != 0) GET_LE(&pt[i].p_vaddr) != 0)
fail("PT_LOAD in wrong place\n"); fail("PT_LOAD in wrong place\n");
if (GET_LE(pt[i].p_memsz) != GET_LE(pt[i].p_filesz)) if (GET_LE(&pt[i].p_memsz) != GET_LE(&pt[i].p_filesz))
fail("cannot handle memsz != filesz\n"); fail("cannot handle memsz != filesz\n");
load_size = GET_LE(pt[i].p_memsz); load_size = GET_LE(&pt[i].p_memsz);
found_load = 1; found_load = 1;
} else if (GET_LE(pt[i].p_type) == PT_DYNAMIC) { } else if (GET_LE(&pt[i].p_type) == PT_DYNAMIC) {
dyn = addr + GET_LE(pt[i].p_offset); dyn = addr + GET_LE(&pt[i].p_offset);
dyn_end = addr + GET_LE(pt[i].p_offset) + dyn_end = addr + GET_LE(&pt[i].p_offset) +
GET_LE(pt[i].p_memsz); GET_LE(&pt[i].p_memsz);
} }
} }
if (!found_load) if (!found_load)
...@@ -47,24 +47,24 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name) ...@@ -47,24 +47,24 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
/* Walk the dynamic table */ /* Walk the dynamic table */
for (i = 0; dyn + i < dyn_end && for (i = 0; dyn + i < dyn_end &&
GET_LE(dyn[i].d_tag) != DT_NULL; i++) { GET_LE(&dyn[i].d_tag) != DT_NULL; i++) {
typeof(dyn[i].d_tag) tag = GET_LE(dyn[i].d_tag); typeof(dyn[i].d_tag) tag = GET_LE(&dyn[i].d_tag);
if (tag == DT_REL || tag == DT_RELSZ || if (tag == DT_REL || tag == DT_RELSZ ||
tag == DT_RELENT || tag == DT_TEXTREL) tag == DT_RELENT || tag == DT_TEXTREL)
fail("vdso image contains dynamic relocations\n"); fail("vdso image contains dynamic relocations\n");
} }
/* Walk the section table */ /* Walk the section table */
secstrings_hdr = addr + GET_LE(hdr->e_shoff) + secstrings_hdr = addr + GET_LE(&hdr->e_shoff) +
GET_LE(hdr->e_shentsize)*GET_LE(hdr->e_shstrndx); GET_LE(&hdr->e_shentsize)*GET_LE(&hdr->e_shstrndx);
secstrings = addr + GET_LE(secstrings_hdr->sh_offset); secstrings = addr + GET_LE(&secstrings_hdr->sh_offset);
for (i = 0; i < GET_LE(hdr->e_shnum); i++) { for (i = 0; i < GET_LE(&hdr->e_shnum); i++) {
Elf_Shdr *sh = addr + GET_LE(hdr->e_shoff) + Elf_Shdr *sh = addr + GET_LE(&hdr->e_shoff) +
GET_LE(hdr->e_shentsize) * i; GET_LE(&hdr->e_shentsize) * i;
if (GET_LE(sh->sh_type) == SHT_SYMTAB) if (GET_LE(&sh->sh_type) == SHT_SYMTAB)
symtab_hdr = sh; symtab_hdr = sh;
if (!strcmp(secstrings + GET_LE(sh->sh_name), if (!strcmp(secstrings + GET_LE(&sh->sh_name),
".altinstructions")) ".altinstructions"))
alt_sec = sh; alt_sec = sh;
} }
...@@ -72,25 +72,25 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name) ...@@ -72,25 +72,25 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
if (!symtab_hdr) if (!symtab_hdr)
fail("no symbol table\n"); fail("no symbol table\n");
strtab_hdr = addr + GET_LE(hdr->e_shoff) + strtab_hdr = addr + GET_LE(&hdr->e_shoff) +
GET_LE(hdr->e_shentsize) * GET_LE(symtab_hdr->sh_link); GET_LE(&hdr->e_shentsize) * GET_LE(&symtab_hdr->sh_link);
/* Walk the symbol table */ /* Walk the symbol table */
for (i = 0; for (i = 0;
i < GET_LE(symtab_hdr->sh_size) / GET_LE(symtab_hdr->sh_entsize); i < GET_LE(&symtab_hdr->sh_size) / GET_LE(&symtab_hdr->sh_entsize);
i++) { i++) {
int k; int k;
Elf_Sym *sym = addr + GET_LE(symtab_hdr->sh_offset) + Elf_Sym *sym = addr + GET_LE(&symtab_hdr->sh_offset) +
GET_LE(symtab_hdr->sh_entsize) * i; GET_LE(&symtab_hdr->sh_entsize) * i;
const char *name = addr + GET_LE(strtab_hdr->sh_offset) + const char *name = addr + GET_LE(&strtab_hdr->sh_offset) +
GET_LE(sym->st_name); GET_LE(&sym->st_name);
for (k = 0; k < NSYMS; k++) { for (k = 0; k < NSYMS; k++) {
if (!strcmp(name, required_syms[k])) { if (!strcmp(name, required_syms[k])) {
if (syms[k]) { if (syms[k]) {
fail("duplicate symbol %s\n", fail("duplicate symbol %s\n",
required_syms[k]); required_syms[k]);
} }
syms[k] = GET_LE(sym->st_value); syms[k] = GET_LE(&sym->st_value);
} }
} }
} }
...@@ -150,9 +150,9 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name) ...@@ -150,9 +150,9 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
fprintf(outfile, "\t},\n"); fprintf(outfile, "\t},\n");
if (alt_sec) { if (alt_sec) {
fprintf(outfile, "\t.alt = %lu,\n", fprintf(outfile, "\t.alt = %lu,\n",
(unsigned long)GET_LE(alt_sec->sh_offset)); (unsigned long)GET_LE(&alt_sec->sh_offset));
fprintf(outfile, "\t.alt_len = %lu,\n", fprintf(outfile, "\t.alt_len = %lu,\n",
(unsigned long)GET_LE(alt_sec->sh_size)); (unsigned long)GET_LE(&alt_sec->sh_size));
} }
for (i = 0; i < NSYMS; i++) { for (i = 0; i < NSYMS; i++) {
if (syms[i]) if (syms[i])
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment