Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 143 insertions, 0 deletions

diff --git a/arch/sparc/vdso/vdso2c.h b/arch/sparc/vdso/vdso2c.h
new file mode 100644
index 000000000..808decb0f
--- /dev/null
+++ b/arch/sparc/vdso/vdso2c.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
+ */
+
+/*
+ * This file is included up to twice from vdso2c.c.  It generates code for
+ * 32-bit and 64-bit vDSOs.  We will eventually need both for 64-bit builds,
+ * since 32-bit vDSOs will then be built for 32-bit userspace.
+ */
+
+static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
+			 void *stripped_addr, size_t stripped_len,
+			 FILE *outfile, const char *name)
+{
+	int found_load = 0;
+	unsigned long load_size = -1;  /* Work around bogus warning */
+	unsigned long mapping_size;
+	int i;
+	unsigned long j;
+
+	ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr;
+	ELF(Ehdr) *hdr = (ELF(Ehdr) *)raw_addr;
+	ELF(Dyn) *dyn = 0, *dyn_end = 0;
+	INT_BITS syms[NSYMS] = {};
+
+	ELF(Phdr) *pt = (ELF(Phdr) *)(raw_addr + GET_BE(&hdr->e_phoff));
+
+	/* Walk the segment table. */
+	for (i = 0; i < GET_BE(&hdr->e_phnum); i++) {
+		if (GET_BE(&pt[i].p_type) == PT_LOAD) {
+			if (found_load)
+				fail("multiple PT_LOAD segs\n");
+
+			if (GET_BE(&pt[i].p_offset) != 0 ||
+			    GET_BE(&pt[i].p_vaddr) != 0)
+				fail("PT_LOAD in wrong place\n");
+
+			if (GET_BE(&pt[i].p_memsz) != GET_BE(&pt[i].p_filesz))
+				fail("cannot handle memsz != filesz\n");
+
+			load_size = GET_BE(&pt[i].p_memsz);
+			found_load = 1;
+		} else if (GET_BE(&pt[i].p_type) == PT_DYNAMIC) {
+			dyn = raw_addr + GET_BE(&pt[i].p_offset);
+			dyn_end = raw_addr + GET_BE(&pt[i].p_offset) +
+				GET_BE(&pt[i].p_memsz);
+		}
+	}
+	if (!found_load)
+		fail("no PT_LOAD seg\n");
+
+	if (stripped_len < load_size)
+		fail("stripped input is too short\n");
+
+	/* Walk the dynamic table */
+	for (i = 0; dyn + i < dyn_end &&
+		     GET_BE(&dyn[i].d_tag) != DT_NULL; i++) {
+		typeof(dyn[i].d_tag) tag = GET_BE(&dyn[i].d_tag);
+		typeof(dyn[i].d_un.d_val) val = GET_BE(&dyn[i].d_un.d_val);
+
+		if ((tag == DT_RELSZ || tag == DT_RELASZ) && (val != 0))
+			fail("vdso image contains dynamic relocations\n");
+	}
+
+	/* Walk the section table */
+	for (i = 0; i < GET_BE(&hdr->e_shnum); i++) {
+		ELF(Shdr) *sh = raw_addr + GET_BE(&hdr->e_shoff) +
+			GET_BE(&hdr->e_shentsize) * i;
+		if (GET_BE(&sh->sh_type) == SHT_SYMTAB)
+			symtab_hdr = sh;
+	}
+
+	if (!symtab_hdr)
+		fail("no symbol table\n");
+
+	strtab_hdr = raw_addr + GET_BE(&hdr->e_shoff) +
+		GET_BE(&hdr->e_shentsize) * GET_BE(&symtab_hdr->sh_link);
+
+	/* Walk the symbol table */
+	for (i = 0;
+	     i < GET_BE(&symtab_hdr->sh_size) / GET_BE(&symtab_hdr->sh_entsize);
+	     i++) {
+		int k;
+
+		ELF(Sym) *sym = raw_addr + GET_BE(&symtab_hdr->sh_offset) +
+			GET_BE(&symtab_hdr->sh_entsize) * i;
+		const char *name = raw_addr + GET_BE(&strtab_hdr->sh_offset) +
+			GET_BE(&sym->st_name);
+
+		for (k = 0; k < NSYMS; k++) {
+			if (!strcmp(name, required_syms[k].name)) {
+				if (syms[k]) {
+					fail("duplicate symbol %s\n",
+					     required_syms[k].name);
+				}
+
+				/*
+				 * Careful: we use negative addresses, but
+				 * st_value is unsigned, so we rely
+				 * on syms[k] being a signed type of the
+				 * correct width.
+				 */
+				syms[k] = GET_BE(&sym->st_value);
+			}
+		}
+	}
+
+	/* Validate mapping addresses. */
+	if (syms[sym_vvar_start] % 8192)
+		fail("vvar_begin must be a multiple of 8192\n");
+
+	if (!name) {
+		fwrite(stripped_addr, stripped_len, 1, outfile);
+		return;
+	}
+
+	mapping_size = (stripped_len + 8191) / 8192 * 8192;
+
+	fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n");
+	fprintf(outfile, "#include <linux/cache.h>\n");
+	fprintf(outfile, "#include <asm/vdso.h>\n");
+	fprintf(outfile, "\n");
+	fprintf(outfile,
+		"static unsigned char raw_data[%lu] __ro_after_init __aligned(8192)= {",
+		mapping_size);
+	for (j = 0; j < stripped_len; j++) {
+		if (j % 10 == 0)
+			fprintf(outfile, "\n\t");
+		fprintf(outfile, "0x%02X, ",
+			(int)((unsigned char *)stripped_addr)[j]);
+	}
+	fprintf(outfile, "\n};\n\n");
+
+	fprintf(outfile, "const struct vdso_image %s_builtin = {\n", name);
+	fprintf(outfile, "\t.data = raw_data,\n");
+	fprintf(outfile, "\t.size = %lu,\n", mapping_size);
+	for (i = 0; i < NSYMS; i++) {
+		if (required_syms[i].export && syms[i])
+			fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n",
+				required_syms[i].name, (int64_t)syms[i]);
+	}
+	fprintf(outfile, "};\n");
+}