add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/tools/relocs.c
..
..
@@ -11,7 +11,9 @@
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 #define Elf_Shdr		ElfW(Shdr)
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 #define Elf_Sym			ElfW(Sym)
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-static Elf_Ehdr ehdr;
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+static Elf_Ehdr		ehdr;
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+static unsigned long	shnum;
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+static unsigned int	shstrndx;
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 struct relocs {
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 	uint32_t	*offset;
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@@ -131,7 +133,7 @@
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 			      REG_EXTENDED|REG_NOSUB);
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 		if (err) {
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-			regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
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+			regerror(err, &sym_regex_c[i], errbuf, sizeof(errbuf));
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 			die("%s", errbuf);
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 		}
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         }
..
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@@ -197,6 +199,7 @@
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 #if ELF_BITS == 64
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 		REL_TYPE(R_X86_64_NONE),
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 		REL_TYPE(R_X86_64_64),
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+		REL_TYPE(R_X86_64_PC64),
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 		REL_TYPE(R_X86_64_PC32),
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 		REL_TYPE(R_X86_64_GOT32),
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 		REL_TYPE(R_X86_64_PLT32),
..
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@@ -241,9 +244,9 @@
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 {
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 	const char *sec_strtab;
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 	const char *name;
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-	sec_strtab = secs[ehdr.e_shstrndx].strtab;
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+	sec_strtab = secs[shstrndx].strtab;
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 	name = "<noname>";
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-	if (shndx < ehdr.e_shnum) {
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+	if (shndx < shnum) {
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 		name = sec_strtab + secs[shndx].shdr.sh_name;
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 	}
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 	else if (shndx == SHN_ABS) {
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@@ -271,7 +274,7 @@
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 static Elf_Sym *sym_lookup(const char *symname)
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 {
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 	int i;
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		long nsyms;
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 		char *strtab;
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@@ -366,27 +369,41 @@
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 	ehdr.e_shnum     = elf_half_to_cpu(ehdr.e_shnum);
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 	ehdr.e_shstrndx  = elf_half_to_cpu(ehdr.e_shstrndx);
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-	if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
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+	shnum = ehdr.e_shnum;
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+	shstrndx = ehdr.e_shstrndx;
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+
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+	if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
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 		die("Unsupported ELF header type\n");
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-	}
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-	if (ehdr.e_machine != ELF_MACHINE) {
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+	if (ehdr.e_machine != ELF_MACHINE)
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 		die("Not for %s\n", ELF_MACHINE_NAME);
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-	}
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-	if (ehdr.e_version != EV_CURRENT) {
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+	if (ehdr.e_version != EV_CURRENT)
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 		die("Unknown ELF version\n");
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-	}
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-	if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) {
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+	if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
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 		die("Bad Elf header size\n");
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-	}
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-	if (ehdr.e_phentsize != sizeof(Elf_Phdr)) {
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+	if (ehdr.e_phentsize != sizeof(Elf_Phdr))
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 		die("Bad program header entry\n");
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-	}
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-	if (ehdr.e_shentsize != sizeof(Elf_Shdr)) {
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+	if (ehdr.e_shentsize != sizeof(Elf_Shdr))
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 		die("Bad section header entry\n");
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+
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+
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+	if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) {
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+		Elf_Shdr shdr;
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+
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+		if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
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+			die("Seek to %d failed: %s\n", ehdr.e_shoff, strerror(errno));
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+
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+		if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
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+			die("Cannot read initial ELF section header: %s\n", strerror(errno));
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+
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+		if (shnum == SHN_UNDEF)
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+			shnum = elf_xword_to_cpu(shdr.sh_size);
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+
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+		if (shstrndx == SHN_XINDEX)
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+			shstrndx = elf_word_to_cpu(shdr.sh_link);
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 	}
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-	if (ehdr.e_shstrndx >= ehdr.e_shnum) {
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+
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+	if (shstrndx >= shnum)
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 		die("String table index out of bounds\n");
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-	}
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 }
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 static void read_shdrs(FILE *fp)
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@@ -394,20 +411,20 @@
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 	int i;
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 	Elf_Shdr shdr;
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-	secs = calloc(ehdr.e_shnum, sizeof(struct section));
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+	secs = calloc(shnum, sizeof(struct section));
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 	if (!secs) {
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 		die("Unable to allocate %d section headers\n",
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-		    ehdr.e_shnum);
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+		    shnum);
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 	}
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 	if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
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 		die("Seek to %d failed: %s\n",
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 			ehdr.e_shoff, strerror(errno));
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 	}
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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-		if (fread(&shdr, sizeof shdr, 1, fp) != 1)
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+		if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
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 			die("Cannot read ELF section headers %d/%d: %s\n",
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-			    i, ehdr.e_shnum, strerror(errno));
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+			    i, shnum, strerror(errno));
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 		sec->shdr.sh_name      = elf_word_to_cpu(shdr.sh_name);
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 		sec->shdr.sh_type      = elf_word_to_cpu(shdr.sh_type);
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 		sec->shdr.sh_flags     = elf_xword_to_cpu(shdr.sh_flags);
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@@ -418,7 +435,7 @@
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 		sec->shdr.sh_info      = elf_word_to_cpu(shdr.sh_info);
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 		sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
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 		sec->shdr.sh_entsize   = elf_xword_to_cpu(shdr.sh_entsize);
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-		if (sec->shdr.sh_link < ehdr.e_shnum)
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+		if (sec->shdr.sh_link < shnum)
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 			sec->link = &secs[sec->shdr.sh_link];
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 	}
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@@ -427,7 +444,7 @@
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 static void read_strtabs(FILE *fp)
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 {
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 	int i;
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		if (sec->shdr.sh_type != SHT_STRTAB) {
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 			continue;
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@@ -452,7 +469,7 @@
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 static void read_symtabs(FILE *fp)
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 {
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 	int i,j;
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		if (sec->shdr.sh_type != SHT_SYMTAB) {
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 			continue;
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@@ -485,7 +502,7 @@
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 static void read_relocs(FILE *fp)
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 {
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 	int i,j;
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		if (sec->shdr.sh_type != SHT_REL_TYPE) {
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 			continue;
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@@ -528,7 +545,7 @@
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 	printf("Absolute symbols\n");
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 	printf(" Num:    Value Size  Type       Bind        Visibility  Name\n");
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		char *sym_strtab;
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 		int j;
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@@ -566,7 +583,7 @@
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 	else
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 		format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32"  %s\n";
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		struct section *sec = &secs[i];
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 		struct section *sec_applies, *sec_symtab;
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 		char *sym_strtab;
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@@ -650,7 +667,7 @@
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 {
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 	int i;
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 	/* Walk through the relocations */
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		char *sym_strtab;
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 		Elf_Sym *sh_symtab;
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 		struct section *sec_applies, *sec_symtab;
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@@ -706,7 +723,7 @@
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 static void percpu_init(void)
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 {
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 	int i;
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-	for (i = 0; i < ehdr.e_shnum; i++) {
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+	for (i = 0; i < shnum; i++) {
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 		ElfW(Sym) *sym;
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 		if (strcmp(sec_name(i), ".data..percpu"))
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 			continue;
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@@ -738,7 +755,7 @@
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  *	__per_cpu_load
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  *
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  * The "gold" linker incorrectly associates:
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- *	init_per_cpu__irq_stack_union
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+ *	init_per_cpu__fixed_percpu_data
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  *	init_per_cpu__gdt_page
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  */
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 static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
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@@ -783,6 +800,15 @@
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 			add_reloc(&relocs32neg, offset);
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 		break;
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+	case R_X86_64_PC64:
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+		/*
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+		 * Only used by jump labels
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+		 */
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+		if (is_percpu_sym(sym, symname))
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+			die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n",
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+			    symname);
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+		break;
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+
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 	case R_X86_64_8:
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 		if (!shn_abs || !is_reloc(S_ABS, symname))
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 			die("Non-whitelisted %s relocation: %s\n",