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-rw-r--r--target/linux/patches/4.14.44/vdso2.patch263
1 files changed, 0 insertions, 263 deletions
diff --git a/target/linux/patches/4.14.44/vdso2.patch b/target/linux/patches/4.14.44/vdso2.patch
index a6f061b9b..b6c32f31b 100644
--- a/target/linux/patches/4.14.44/vdso2.patch
+++ b/target/linux/patches/4.14.44/vdso2.patch
@@ -25,266 +25,3 @@ diff -Nur linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c linux-4.14.44/arch/x86
struct vdso_sym {
const char *name;
bool export;
-diff -Nur linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c.orig linux-4.14.44/arch/x86/entry/vdso/vdso2c.c.orig
---- linux-4.14.44.orig/arch/x86/entry/vdso/vdso2c.c.orig 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.14.44/arch/x86/entry/vdso/vdso2c.c.orig 2018-05-25 16:18:02.000000000 +0200
-@@ -0,0 +1,259 @@
-+/*
-+ * vdso2c - A vdso image preparation tool
-+ * Copyright (c) 2014 Andy Lutomirski and others
-+ * Licensed under the GPL v2
-+ *
-+ * vdso2c requires stripped and unstripped input. It would be trivial
-+ * to fully strip the input in here, but, for reasons described below,
-+ * we need to write a section table. Doing this is more or less
-+ * equivalent to dropping all non-allocatable sections, but it's
-+ * easier to let objcopy handle that instead of doing it ourselves.
-+ * If we ever need to do something fancier than what objcopy provides,
-+ * it would be straightforward to add here.
-+ *
-+ * We're keep a section table for a few reasons:
-+ *
-+ * The Go runtime had a couple of bugs: it would read the section
-+ * table to try to figure out how many dynamic symbols there were (it
-+ * shouldn't have looked at the section table at all) and, if there
-+ * were no SHT_SYNDYM section table entry, it would use an
-+ * uninitialized value for the number of symbols. An empty DYNSYM
-+ * table would work, but I see no reason not to write a valid one (and
-+ * keep full performance for old Go programs). This hack is only
-+ * needed on x86_64.
-+ *
-+ * The bug was introduced on 2012-08-31 by:
-+ * https://code.google.com/p/go/source/detail?r=56ea40aac72b
-+ * and was fixed on 2014-06-13 by:
-+ * https://code.google.com/p/go/source/detail?r=fc1cd5e12595
-+ *
-+ * Binutils has issues debugging the vDSO: it reads the section table to
-+ * find SHT_NOTE; it won't look at PT_NOTE for the in-memory vDSO, which
-+ * would break build-id if we removed the section table. Binutils
-+ * also requires that shstrndx != 0. See:
-+ * https://sourceware.org/bugzilla/show_bug.cgi?id=17064
-+ *
-+ * elfutils might not look for PT_NOTE if there is a section table at
-+ * all. I don't know whether this matters for any practical purpose.
-+ *
-+ * For simplicity, rather than hacking up a partial section table, we
-+ * just write a mostly complete one. We omit non-dynamic symbols,
-+ * though, since they're rather large.
-+ *
-+ * Once binutils gets fixed, we might be able to drop this for all but
-+ * the 64-bit vdso, since build-id only works in kernel RPMs, and
-+ * systems that update to new enough kernel RPMs will likely update
-+ * binutils in sync. build-id has never worked for home-built kernel
-+ * RPMs without manual symlinking, and I suspect that no one ever does
-+ * that.
-+ */
-+
-+#include <inttypes.h>
-+#include <stdint.h>
-+#include <unistd.h>
-+#include <stdarg.h>
-+#include <stdlib.h>
-+#include <stdio.h>
-+#include <string.h>
-+#include <fcntl.h>
-+#include <err.h>
-+
-+#include <sys/mman.h>
-+#include <sys/types.h>
-+
-+#include <tools/le_byteshift.h>
-+
-+#include <linux/elf.h>
-+#include <linux/types.h>
-+
-+const char *outfilename;
-+
-+/* Symbols that we need in vdso2c. */
-+enum {
-+ sym_vvar_start,
-+ sym_vvar_page,
-+ sym_hpet_page,
-+ sym_pvclock_page,
-+ sym_hvclock_page,
-+ sym_VDSO_FAKE_SECTION_TABLE_START,
-+ sym_VDSO_FAKE_SECTION_TABLE_END,
-+};
-+
-+const int special_pages[] = {
-+ sym_vvar_page,
-+ sym_hpet_page,
-+ sym_pvclock_page,
-+ sym_hvclock_page,
-+};
-+
-+struct vdso_sym {
-+ const char *name;
-+ bool export;
-+};
-+
-+struct vdso_sym required_syms[] = {
-+ [sym_vvar_start] = {"vvar_start", true},
-+ [sym_vvar_page] = {"vvar_page", true},
-+ [sym_hpet_page] = {"hpet_page", true},
-+ [sym_pvclock_page] = {"pvclock_page", true},
-+ [sym_hvclock_page] = {"hvclock_page", true},
-+ [sym_VDSO_FAKE_SECTION_TABLE_START] = {
-+ "VDSO_FAKE_SECTION_TABLE_START", false
-+ },
-+ [sym_VDSO_FAKE_SECTION_TABLE_END] = {
-+ "VDSO_FAKE_SECTION_TABLE_END", false
-+ },
-+ {"VDSO32_NOTE_MASK", true},
-+ {"__kernel_vsyscall", true},
-+ {"__kernel_sigreturn", true},
-+ {"__kernel_rt_sigreturn", true},
-+ {"int80_landing_pad", true},
-+};
-+
-+__attribute__((format(printf, 1, 2))) __attribute__((noreturn))
-+static void fail(const char *format, ...)
-+{
-+ va_list ap;
-+ va_start(ap, format);
-+ fprintf(stderr, "Error: ");
-+ vfprintf(stderr, format, ap);
-+ if (outfilename)
-+ unlink(outfilename);
-+ exit(1);
-+ va_end(ap);
-+}
-+
-+/*
-+ * Evil macros for little-endian reads and writes
-+ */
-+#define GLE(x, bits, ifnot) \
-+ __builtin_choose_expr( \
-+ (sizeof(*(x)) == bits/8), \
-+ (__typeof__(*(x)))get_unaligned_le##bits(x), ifnot)
-+
-+extern void bad_get_le(void);
-+#define LAST_GLE(x) \
-+ __builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le())
-+
-+#define GET_LE(x) \
-+ GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_GLE(x))))
-+
-+#define PLE(x, val, bits, ifnot) \
-+ __builtin_choose_expr( \
-+ (sizeof(*(x)) == bits/8), \
-+ put_unaligned_le##bits((val), (x)), ifnot)
-+
-+extern void bad_put_le(void);
-+#define LAST_PLE(x, val) \
-+ __builtin_choose_expr(sizeof(*(x)) == 1, *(x) = (val), bad_put_le())
-+
-+#define PUT_LE(x, val) \
-+ PLE(x, val, 64, PLE(x, val, 32, PLE(x, val, 16, LAST_PLE(x, val))))
-+
-+
-+#define NSYMS (sizeof(required_syms) / sizeof(required_syms[0]))
-+
-+#define BITSFUNC3(name, bits, suffix) name##bits##suffix
-+#define BITSFUNC2(name, bits, suffix) BITSFUNC3(name, bits, suffix)
-+#define BITSFUNC(name) BITSFUNC2(name, ELF_BITS, )
-+
-+#define INT_BITS BITSFUNC2(int, ELF_BITS, _t)
-+
-+#define ELF_BITS_XFORM2(bits, x) Elf##bits##_##x
-+#define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x)
-+#define ELF(x) ELF_BITS_XFORM(ELF_BITS, x)
-+
-+#define ELF_BITS 64
-+#include "vdso2c.h"
-+#undef ELF_BITS
-+
-+#define ELF_BITS 32
-+#include "vdso2c.h"
-+#undef ELF_BITS
-+
-+static void go(void *raw_addr, size_t raw_len,
-+ void *stripped_addr, size_t stripped_len,
-+ FILE *outfile, const char *name)
-+{
-+ Elf64_Ehdr *hdr = (Elf64_Ehdr *)raw_addr;
-+
-+ if (hdr->e_ident[EI_CLASS] == ELFCLASS64) {
-+ go64(raw_addr, raw_len, stripped_addr, stripped_len,
-+ outfile, name);
-+ } else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) {
-+ go32(raw_addr, raw_len, stripped_addr, stripped_len,
-+ outfile, name);
-+ } else {
-+ fail("unknown ELF class\n");
-+ }
-+}
-+
-+static void map_input(const char *name, void **addr, size_t *len, int prot)
-+{
-+ off_t tmp_len;
-+
-+ int fd = open(name, O_RDONLY);
-+ if (fd == -1)
-+ err(1, "%s", name);
-+
-+ tmp_len = lseek(fd, 0, SEEK_END);
-+ if (tmp_len == (off_t)-1)
-+ err(1, "lseek");
-+ *len = (size_t)tmp_len;
-+
-+ *addr = mmap(NULL, tmp_len, prot, MAP_PRIVATE, fd, 0);
-+ if (*addr == MAP_FAILED)
-+ err(1, "mmap");
-+
-+ close(fd);
-+}
-+
-+int main(int argc, char **argv)
-+{
-+ size_t raw_len, stripped_len;
-+ void *raw_addr, *stripped_addr;
-+ FILE *outfile;
-+ char *name, *tmp;
-+ int namelen;
-+
-+ if (argc != 4) {
-+ printf("Usage: vdso2c RAW_INPUT STRIPPED_INPUT OUTPUT\n");
-+ return 1;
-+ }
-+
-+ /*
-+ * Figure out the struct name. If we're writing to a .so file,
-+ * generate raw output insted.
-+ */
-+ name = strdup(argv[3]);
-+ namelen = strlen(name);
-+ if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) {
-+ name = NULL;
-+ } else {
-+ tmp = strrchr(name, '/');
-+ if (tmp)
-+ name = tmp + 1;
-+ tmp = strchr(name, '.');
-+ if (tmp)
-+ *tmp = '\0';
-+ for (tmp = name; *tmp; tmp++)
-+ if (*tmp == '-')
-+ *tmp = '_';
-+ }
-+
-+ map_input(argv[1], &raw_addr, &raw_len, PROT_READ);
-+ map_input(argv[2], &stripped_addr, &stripped_len, PROT_READ);
-+
-+ outfilename = argv[3];
-+ outfile = fopen(outfilename, "w");
-+ if (!outfile)
-+ err(1, "%s", argv[2]);
-+
-+ go(raw_addr, raw_len, stripped_addr, stripped_len, outfile, name);
-+
-+ munmap(raw_addr, raw_len);
-+ munmap(stripped_addr, stripped_len);
-+ fclose(outfile);
-+
-+ return 0;
-+}