Adding upstream version 5.10.209.upstream/5.10.209

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

1 files changed, 990 insertions, 0 deletions

diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
new file mode 100644
index 000000000..7df140545
--- /dev/null
+++ b/arch/parisc/kernel/module.c
@@ -0,0 +1,990 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*    Kernel dynamically loadable module help for PARISC.
+ *
+ *    The best reference for this stuff is probably the Processor-
+ *    Specific ELF Supplement for PA-RISC:
+ *        https://parisc.wiki.kernel.org/index.php/File:Elf-pa-hp.pdf
+ *
+ *    Linux/PA-RISC Project
+ *    Copyright (C) 2003 Randolph Chung <tausq at debian . org>
+ *    Copyright (C) 2008 Helge Deller <deller@gmx.de>
+ *
+ *    Notes:
+ *    - PLT stub handling
+ *      On 32bit (and sometimes 64bit) and with big kernel modules like xfs or
+ *      ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may
+ *      fail to reach their PLT stub if we only create one big stub array for
+ *      all sections at the beginning of the core or init section.
+ *      Instead we now insert individual PLT stub entries directly in front of
+ *      of the code sections where the stubs are actually called.
+ *      This reduces the distance between the PCREL location and the stub entry
+ *      so that the relocations can be fulfilled.
+ *      While calculating the final layout of the kernel module in memory, the
+ *      kernel module loader calls arch_mod_section_prepend() to request the
+ *      to be reserved amount of memory in front of each individual section.
+ *
+ *    - SEGREL32 handling
+ *      We are not doing SEGREL32 handling correctly. According to the ABI, we
+ *      should do a value offset, like this:
+ *			if (in_init(me, (void *)val))
+ *				val -= (uint32_t)me->init_layout.base;
+ *			else
+ *				val -= (uint32_t)me->core_layout.base;
+ *	However, SEGREL32 is used only for PARISC unwind entries, and we want
+ *	those entries to have an absolute address, and not just an offset.
+ *
+ *	The unwind table mechanism has the ability to specify an offset for
+ *	the unwind table; however, because we split off the init functions into
+ *	a different piece of memory, it is not possible to do this using a
+ *	single offset. Instead, we use the above hack for now.
+ */
+
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/ftrace.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/bug.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <asm/unwind.h>
+#include <asm/sections.h>
+
+#define RELOC_REACHABLE(val, bits) \
+	(( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 )  ||	\
+	     ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \
+	0 : 1)
+
+#define CHECK_RELOC(val, bits) \
+	if (!RELOC_REACHABLE(val, bits)) { \
+		printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
+		me->name, strtab + sym->st_name, (unsigned long)val, bits); \
+		return -ENOEXEC;			\
+	}
+
+/* Maximum number of GOT entries. We use a long displacement ldd from
+ * the bottom of the table, which has a maximum signed displacement of
+ * 0x3fff; however, since we're only going forward, this becomes
+ * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
+ * at most 1023 entries.
+ * To overcome this 14bit displacement with some kernel modules, we'll
+ * use instead the unusal 16bit displacement method (see reassemble_16a)
+ * which gives us a maximum positive displacement of 0x7fff, and as such
+ * allows us to allocate up to 4095 GOT entries. */
+#define MAX_GOTS	4095
+
+/* three functions to determine where in the module core
+ * or init pieces the location is */
+static inline int in_init(struct module *me, void *loc)
+{
+	return (loc >= me->init_layout.base &&
+		loc <= (me->init_layout.base + me->init_layout.size));
+}
+
+static inline int in_core(struct module *me, void *loc)
+{
+	return (loc >= me->core_layout.base &&
+		loc <= (me->core_layout.base + me->core_layout.size));
+}
+
+static inline int in_local(struct module *me, void *loc)
+{
+	return in_init(me, loc) || in_core(me, loc);
+}
+
+#ifndef CONFIG_64BIT
+struct got_entry {
+	Elf32_Addr addr;
+};
+
+struct stub_entry {
+	Elf32_Word insns[2]; /* each stub entry has two insns */
+};
+#else
+struct got_entry {
+	Elf64_Addr addr;
+};
+
+struct stub_entry {
+	Elf64_Word insns[4]; /* each stub entry has four insns */
+};
+#endif
+
+/* Field selection types defined by hppa */
+#define rnd(x)			(((x)+0x1000)&~0x1fff)
+/* fsel: full 32 bits */
+#define fsel(v,a)		((v)+(a))
+/* lsel: select left 21 bits */
+#define lsel(v,a)		(((v)+(a))>>11)
+/* rsel: select right 11 bits */
+#define rsel(v,a)		(((v)+(a))&0x7ff)
+/* lrsel with rounding of addend to nearest 8k */
+#define lrsel(v,a)		(((v)+rnd(a))>>11)
+/* rrsel with rounding of addend to nearest 8k */
+#define rrsel(v,a)		((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
+
+#define mask(x,sz)		((x) & ~((1<<(sz))-1))
+
+
+/* The reassemble_* functions prepare an immediate value for
+   insertion into an opcode. pa-risc uses all sorts of weird bitfields
+   in the instruction to hold the value.  */
+static inline int sign_unext(int x, int len)
+{
+	int len_ones;
+
+	len_ones = (1 << len) - 1;
+	return x & len_ones;
+}
+
+static inline int low_sign_unext(int x, int len)
+{
+	int sign, temp;
+
+	sign = (x >> (len-1)) & 1;
+	temp = sign_unext(x, len-1);
+	return (temp << 1) | sign;
+}
+
+static inline int reassemble_14(int as14)
+{
+	return (((as14 & 0x1fff) << 1) |
+		((as14 & 0x2000) >> 13));
+}
+
+static inline int reassemble_16a(int as16)
+{
+	int s, t;
+
+	/* Unusual 16-bit encoding, for wide mode only.  */
+	t = (as16 << 1) & 0xffff;
+	s = (as16 & 0x8000);
+	return (t ^ s ^ (s >> 1)) | (s >> 15);
+}
+
+
+static inline int reassemble_17(int as17)
+{
+	return (((as17 & 0x10000) >> 16) |
+		((as17 & 0x0f800) << 5) |
+		((as17 & 0x00400) >> 8) |
+		((as17 & 0x003ff) << 3));
+}
+
+static inline int reassemble_21(int as21)
+{
+	return (((as21 & 0x100000) >> 20) |
+		((as21 & 0x0ffe00) >> 8) |
+		((as21 & 0x000180) << 7) |
+		((as21 & 0x00007c) << 14) |
+		((as21 & 0x000003) << 12));
+}
+
+static inline int reassemble_22(int as22)
+{
+	return (((as22 & 0x200000) >> 21) |
+		((as22 & 0x1f0000) << 5) |
+		((as22 & 0x00f800) << 5) |
+		((as22 & 0x000400) >> 8) |
+		((as22 & 0x0003ff) << 3));
+}
+
+void *module_alloc(unsigned long size)
+{
+	/* using RWX means less protection for modules, but it's
+	 * easier than trying to map the text, data, init_text and
+	 * init_data correctly */
+	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
+				    GFP_KERNEL,
+				    PAGE_KERNEL_RWX, 0, NUMA_NO_NODE,
+				    __builtin_return_address(0));
+}
+
+#ifndef CONFIG_64BIT
+static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
+{
+	return 0;
+}
+
+static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
+{
+	return 0;
+}
+
+static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
+{
+	unsigned long cnt = 0;
+
+	for (; n > 0; n--, rela++)
+	{
+		switch (ELF32_R_TYPE(rela->r_info)) {
+			case R_PARISC_PCREL17F:
+			case R_PARISC_PCREL22F:
+				cnt++;
+		}
+	}
+
+	return cnt;
+}
+#else
+static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
+{
+	unsigned long cnt = 0;
+
+	for (; n > 0; n--, rela++)
+	{
+		switch (ELF64_R_TYPE(rela->r_info)) {
+			case R_PARISC_LTOFF21L:
+			case R_PARISC_LTOFF14R:
+			case R_PARISC_PCREL22F:
+				cnt++;
+		}
+	}
+
+	return cnt;
+}
+
+static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
+{
+	unsigned long cnt = 0;
+
+	for (; n > 0; n--, rela++)
+	{
+		switch (ELF64_R_TYPE(rela->r_info)) {
+			case R_PARISC_FPTR64:
+				cnt++;
+		}
+	}
+
+	return cnt;
+}
+
+static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
+{
+	unsigned long cnt = 0;
+
+	for (; n > 0; n--, rela++)
+	{
+		switch (ELF64_R_TYPE(rela->r_info)) {
+			case R_PARISC_PCREL22F:
+				cnt++;
+		}
+	}
+
+	return cnt;
+}
+#endif
+
+void module_arch_freeing_init(struct module *mod)
+{
+	kfree(mod->arch.section);
+	mod->arch.section = NULL;
+}
+
+/* Additional bytes needed in front of individual sections */
+unsigned int arch_mod_section_prepend(struct module *mod,
+				      unsigned int section)
+{
+	/* size needed for all stubs of this section (including
+	 * one additional for correct alignment of the stubs) */
+	return (mod->arch.section[section].stub_entries + 1)
+		* sizeof(struct stub_entry);
+}
+
+#define CONST
+int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
+			      CONST Elf_Shdr *sechdrs,
+			      CONST char *secstrings,
+			      struct module *me)
+{
+	unsigned long gots = 0, fdescs = 0, len;
+	unsigned int i;
+
+	len = hdr->e_shnum * sizeof(me->arch.section[0]);
+	me->arch.section = kzalloc(len, GFP_KERNEL);
+	if (!me->arch.section)
+		return -ENOMEM;
+
+	for (i = 1; i < hdr->e_shnum; i++) {
+		const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
+		unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
+		unsigned int count, s;
+
+		if (strncmp(secstrings + sechdrs[i].sh_name,
+			    ".PARISC.unwind", 14) == 0)
+			me->arch.unwind_section = i;
+
+		if (sechdrs[i].sh_type != SHT_RELA)
+			continue;
+
+		/* some of these are not relevant for 32-bit/64-bit
+		 * we leave them here to make the code common. the
+		 * compiler will do its thing and optimize out the
+		 * stuff we don't need
+		 */
+		gots += count_gots(rels, nrels);
+		fdescs += count_fdescs(rels, nrels);
+
+		/* XXX: By sorting the relocs and finding duplicate entries
+		 *  we could reduce the number of necessary stubs and save
+		 *  some memory. */
+		count = count_stubs(rels, nrels);
+		if (!count)
+			continue;
+
+		/* so we need relocation stubs. reserve necessary memory. */
+		/* sh_info gives the section for which we need to add stubs. */
+		s = sechdrs[i].sh_info;
+
+		/* each code section should only have one relocation section */
+		WARN_ON(me->arch.section[s].stub_entries);
+
+		/* store number of stubs we need for this section */
+		me->arch.section[s].stub_entries += count;
+	}
+
+	/* align things a bit */
+	me->core_layout.size = ALIGN(me->core_layout.size, 16);
+	me->arch.got_offset = me->core_layout.size;
+	me->core_layout.size += gots * sizeof(struct got_entry);
+
+	me->core_layout.size = ALIGN(me->core_layout.size, 16);
+	me->arch.fdesc_offset = me->core_layout.size;
+	me->core_layout.size += fdescs * sizeof(Elf_Fdesc);
+
+	me->arch.got_max = gots;
+	me->arch.fdesc_max = fdescs;
+
+	return 0;
+}
+
+#ifdef CONFIG_64BIT
+static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
+{
+	unsigned int i;
+	struct got_entry *got;
+
+	value += addend;
+
+	BUG_ON(value == 0);
+
+	got = me->core_layout.base + me->arch.got_offset;
+	for (i = 0; got[i].addr; i++)
+		if (got[i].addr == value)
+			goto out;
+
+	BUG_ON(++me->arch.got_count > me->arch.got_max);
+
+	got[i].addr = value;
+ out:
+	pr_debug("GOT ENTRY %d[%lx] val %lx\n", i, i*sizeof(struct got_entry),
+	       value);
+	return i * sizeof(struct got_entry);
+}
+#endif /* CONFIG_64BIT */
+
+#ifdef CONFIG_64BIT
+static Elf_Addr get_fdesc(struct module *me, unsigned long value)
+{
+	Elf_Fdesc *fdesc = me->core_layout.base + me->arch.fdesc_offset;
+
+	if (!value) {
+		printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
+		return 0;
+	}
+
+	/* Look for existing fdesc entry. */
+	while (fdesc->addr) {
+		if (fdesc->addr == value)
+			return (Elf_Addr)fdesc;
+		fdesc++;
+	}
+
+	BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
+
+	/* Create new one */
+	fdesc->addr = value;
+	fdesc->gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset;
+	return (Elf_Addr)fdesc;
+}
+#endif /* CONFIG_64BIT */
+
+enum elf_stub_type {
+	ELF_STUB_GOT,
+	ELF_STUB_MILLI,
+	ELF_STUB_DIRECT,
+};
+
+static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
+	enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
+{
+	struct stub_entry *stub;
+	int __maybe_unused d;
+
+	/* initialize stub_offset to point in front of the section */
+	if (!me->arch.section[targetsec].stub_offset) {
+		loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
+				sizeof(struct stub_entry);
+		/* get correct alignment for the stubs */
+		loc0 = ALIGN(loc0, sizeof(struct stub_entry));
+		me->arch.section[targetsec].stub_offset = loc0;
+	}
+
+	/* get address of stub entry */
+	stub = (void *) me->arch.section[targetsec].stub_offset;
+	me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
+
+	/* do not write outside available stub area */
+	BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
+
+
+#ifndef CONFIG_64BIT
+/* for 32-bit the stub looks like this:
+ * 	ldil L'XXX,%r1
+ * 	be,n R'XXX(%sr4,%r1)
+ */
+	//value = *(unsigned long *)((value + addend) & ~3); /* why? */
+
+	stub->insns[0] = 0x20200000;	/* ldil L'XXX,%r1	*/
+	stub->insns[1] = 0xe0202002;	/* be,n R'XXX(%sr4,%r1)	*/
+
+	stub->insns[0] |= reassemble_21(lrsel(value, addend));
+	stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
+
+#else
+/* for 64-bit we have three kinds of stubs:
+ * for normal function calls:
+ * 	ldd 0(%dp),%dp
+ * 	ldd 10(%dp), %r1
+ * 	bve (%r1)
+ * 	ldd 18(%dp), %dp
+ *
+ * for millicode:
+ * 	ldil 0, %r1
+ * 	ldo 0(%r1), %r1
+ * 	ldd 10(%r1), %r1
+ * 	bve,n (%r1)
+ *
+ * for direct branches (jumps between different section of the
+ * same module):
+ *	ldil 0, %r1
+ *	ldo 0(%r1), %r1
+ *	bve,n (%r1)
+ */
+	switch (stub_type) {
+	case ELF_STUB_GOT:
+		d = get_got(me, value, addend);
+		if (d <= 15) {
+			/* Format 5 */
+			stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp	*/
+			stub->insns[0] |= low_sign_unext(d, 5) << 16;
+		} else {
+			/* Format 3 */
+			stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp	*/
+			stub->insns[0] |= reassemble_16a(d);
+		}
+		stub->insns[1] = 0x53610020;	/* ldd 10(%dp),%r1	*/
+		stub->insns[2] = 0xe820d000;	/* bve (%r1)		*/
+		stub->insns[3] = 0x537b0030;	/* ldd 18(%dp),%dp	*/
+		break;
+	case ELF_STUB_MILLI:
+		stub->insns[0] = 0x20200000;	/* ldil 0,%r1		*/
+		stub->insns[1] = 0x34210000;	/* ldo 0(%r1), %r1	*/
+		stub->insns[2] = 0x50210020;	/* ldd 10(%r1),%r1	*/
+		stub->insns[3] = 0xe820d002;	/* bve,n (%r1)		*/
+
+		stub->insns[0] |= reassemble_21(lrsel(value, addend));
+		stub->insns[1] |= reassemble_14(rrsel(value, addend));
+		break;
+	case ELF_STUB_DIRECT:
+		stub->insns[0] = 0x20200000;    /* ldil 0,%r1           */
+		stub->insns[1] = 0x34210000;    /* ldo 0(%r1), %r1      */
+		stub->insns[2] = 0xe820d002;    /* bve,n (%r1)          */
+
+		stub->insns[0] |= reassemble_21(lrsel(value, addend));
+		stub->insns[1] |= reassemble_14(rrsel(value, addend));
+		break;
+	}
+
+#endif
+
+	return (Elf_Addr)stub;
+}
+
+#ifndef CONFIG_64BIT
+int apply_relocate_add(Elf_Shdr *sechdrs,
+		       const char *strtab,
+		       unsigned int symindex,
+		       unsigned int relsec,
+		       struct module *me)
+{
+	int i;
+	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+	Elf32_Sym *sym;
+	Elf32_Word *loc;
+	Elf32_Addr val;
+	Elf32_Sword addend;
+	Elf32_Addr dot;
+	Elf_Addr loc0;
+	unsigned int targetsec = sechdrs[relsec].sh_info;
+	//unsigned long dp = (unsigned long)$global$;
+	register unsigned long dp asm ("r27");
+
+	pr_debug("Applying relocate section %u to %u\n", relsec,
+	       targetsec);
+	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+		/* This is where to make the change */
+		loc = (void *)sechdrs[targetsec].sh_addr
+		      + rel[i].r_offset;
+		/* This is the start of the target section */
+		loc0 = sechdrs[targetsec].sh_addr;
+		/* This is the symbol it is referring to */
+		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+			+ ELF32_R_SYM(rel[i].r_info);
+		if (!sym->st_value) {
+			printk(KERN_WARNING "%s: Unknown symbol %s\n",
+			       me->name, strtab + sym->st_name);
+			return -ENOENT;
+		}
+		//dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
+		dot =  (Elf32_Addr)loc & ~0x03;
+
+		val = sym->st_value;
+		addend = rel[i].r_addend;
+
+#if 0
+#define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
+		pr_debug("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
+			strtab + sym->st_name,
+			(uint32_t)loc, val, addend,
+			r(R_PARISC_PLABEL32)
+			r(R_PARISC_DIR32)
+			r(R_PARISC_DIR21L)
+			r(R_PARISC_DIR14R)
+			r(R_PARISC_SEGREL32)
+			r(R_PARISC_DPREL21L)
+			r(R_PARISC_DPREL14R)
+			r(R_PARISC_PCREL17F)
+			r(R_PARISC_PCREL22F)
+			"UNKNOWN");
+#undef r
+#endif
+
+		switch (ELF32_R_TYPE(rel[i].r_info)) {
+		case R_PARISC_PLABEL32:
+			/* 32-bit function address */
+			/* no function descriptors... */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_DIR32:
+			/* direct 32-bit ref */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_DIR21L:
+			/* left 21 bits of effective address */
+			val = lrsel(val, addend);
+			*loc = mask(*loc, 21) | reassemble_21(val);
+			break;
+		case R_PARISC_DIR14R:
+			/* right 14 bits of effective address */
+			val = rrsel(val, addend);
+			*loc = mask(*loc, 14) | reassemble_14(val);
+			break;
+		case R_PARISC_SEGREL32:
+			/* 32-bit segment relative address */
+			/* See note about special handling of SEGREL32 at
+			 * the beginning of this file.
+			 */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_SECREL32:
+			/* 32-bit section relative address. */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_DPREL21L:
+			/* left 21 bit of relative address */
+			val = lrsel(val - dp, addend);
+			*loc = mask(*loc, 21) | reassemble_21(val);
+			break;
+		case R_PARISC_DPREL14R:
+			/* right 14 bit of relative address */
+			val = rrsel(val - dp, addend);
+			*loc = mask(*loc, 14) | reassemble_14(val);
+			break;
+		case R_PARISC_PCREL17F:
+			/* 17-bit PC relative address */
+			/* calculate direct call offset */
+			val += addend;
+			val = (val - dot - 8)/4;
+			if (!RELOC_REACHABLE(val, 17)) {
+				/* direct distance too far, create
+				 * stub entry instead */
+				val = get_stub(me, sym->st_value, addend,
+					ELF_STUB_DIRECT, loc0, targetsec);
+				val = (val - dot - 8)/4;
+				CHECK_RELOC(val, 17);
+			}
+			*loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
+			break;
+		case R_PARISC_PCREL22F:
+			/* 22-bit PC relative address; only defined for pa20 */
+			/* calculate direct call offset */
+			val += addend;
+			val = (val - dot - 8)/4;
+			if (!RELOC_REACHABLE(val, 22)) {
+				/* direct distance too far, create
+				 * stub entry instead */
+				val = get_stub(me, sym->st_value, addend,
+					ELF_STUB_DIRECT, loc0, targetsec);
+				val = (val - dot - 8)/4;
+				CHECK_RELOC(val, 22);
+			}
+			*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
+			break;
+		case R_PARISC_PCREL32:
+			/* 32-bit PC relative address */
+			*loc = val - dot - 8 + addend;
+			break;
+
+		default:
+			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+			       me->name, ELF32_R_TYPE(rel[i].r_info));
+			return -ENOEXEC;
+		}
+	}
+
+	return 0;
+}
+
+#else
+int apply_relocate_add(Elf_Shdr *sechdrs,
+		       const char *strtab,
+		       unsigned int symindex,
+		       unsigned int relsec,
+		       struct module *me)
+{
+	int i;
+	Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+	Elf64_Sym *sym;
+	Elf64_Word *loc;
+	Elf64_Xword *loc64;
+	Elf64_Addr val;
+	Elf64_Sxword addend;
+	Elf64_Addr dot;
+	Elf_Addr loc0;
+	unsigned int targetsec = sechdrs[relsec].sh_info;
+
+	pr_debug("Applying relocate section %u to %u\n", relsec,
+	       targetsec);
+	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+		/* This is where to make the change */
+		loc = (void *)sechdrs[targetsec].sh_addr
+		      + rel[i].r_offset;
+		/* This is the start of the target section */
+		loc0 = sechdrs[targetsec].sh_addr;
+		/* This is the symbol it is referring to */
+		sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
+			+ ELF64_R_SYM(rel[i].r_info);
+		if (!sym->st_value) {
+			printk(KERN_WARNING "%s: Unknown symbol %s\n",
+			       me->name, strtab + sym->st_name);
+			return -ENOENT;
+		}
+		//dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
+		dot = (Elf64_Addr)loc & ~0x03;
+		loc64 = (Elf64_Xword *)loc;
+
+		val = sym->st_value;
+		addend = rel[i].r_addend;
+
+#if 0
+#define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t :
+		printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n",
+			strtab + sym->st_name,
+			loc, val, addend,
+			r(R_PARISC_LTOFF14R)
+			r(R_PARISC_LTOFF21L)
+			r(R_PARISC_PCREL22F)
+			r(R_PARISC_DIR64)
+			r(R_PARISC_SEGREL32)
+			r(R_PARISC_FPTR64)
+			"UNKNOWN");
+#undef r
+#endif
+
+		switch (ELF64_R_TYPE(rel[i].r_info)) {
+		case R_PARISC_LTOFF21L:
+			/* LT-relative; left 21 bits */
+			val = get_got(me, val, addend);
+			pr_debug("LTOFF21L Symbol %s loc %p val %llx\n",
+			       strtab + sym->st_name,
+			       loc, val);
+			val = lrsel(val, 0);
+			*loc = mask(*loc, 21) | reassemble_21(val);
+			break;
+		case R_PARISC_LTOFF14R:
+			/* L(ltoff(val+addend)) */
+			/* LT-relative; right 14 bits */
+			val = get_got(me, val, addend);
+			val = rrsel(val, 0);
+			pr_debug("LTOFF14R Symbol %s loc %p val %llx\n",
+			       strtab + sym->st_name,
+			       loc, val);
+			*loc = mask(*loc, 14) | reassemble_14(val);
+			break;
+		case R_PARISC_PCREL22F:
+			/* PC-relative; 22 bits */
+			pr_debug("PCREL22F Symbol %s loc %p val %llx\n",
+			       strtab + sym->st_name,
+			       loc, val);
+			val += addend;
+			/* can we reach it locally? */
+			if (in_local(me, (void *)val)) {
+				/* this is the case where the symbol is local
+				 * to the module, but in a different section,
+				 * so stub the jump in case it's more than 22
+				 * bits away */
+				val = (val - dot - 8)/4;
+				if (!RELOC_REACHABLE(val, 22)) {
+					/* direct distance too far, create
+					 * stub entry instead */
+					val = get_stub(me, sym->st_value,
+						addend, ELF_STUB_DIRECT,
+						loc0, targetsec);
+				} else {
+					/* Ok, we can reach it directly. */
+					val = sym->st_value;
+					val += addend;
+				}
+			} else {
+				val = sym->st_value;
+				if (strncmp(strtab + sym->st_name, "$$", 2)
+				    == 0)
+					val = get_stub(me, val, addend, ELF_STUB_MILLI,
+						       loc0, targetsec);
+				else
+					val = get_stub(me, val, addend, ELF_STUB_GOT,
+						       loc0, targetsec);
+			}
+			pr_debug("STUB FOR %s loc %px, val %llx+%llx at %llx\n",
+			       strtab + sym->st_name, loc, sym->st_value,
+			       addend, val);
+			val = (val - dot - 8)/4;
+			CHECK_RELOC(val, 22);
+			*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
+			break;
+		case R_PARISC_PCREL32:
+			/* 32-bit PC relative address */
+			*loc = val - dot - 8 + addend;
+			break;
+		case R_PARISC_PCREL64:
+			/* 64-bit PC relative address */
+			*loc64 = val - dot - 8 + addend;
+			break;
+		case R_PARISC_DIR64:
+			/* 64-bit effective address */
+			*loc64 = val + addend;
+			break;
+		case R_PARISC_SEGREL32:
+			/* 32-bit segment relative address */
+			/* See note about special handling of SEGREL32 at
+			 * the beginning of this file.
+			 */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_SECREL32:
+			/* 32-bit section relative address. */
+			*loc = fsel(val, addend);
+			break;
+		case R_PARISC_FPTR64:
+			/* 64-bit function address */
+			if(in_local(me, (void *)(val + addend))) {
+				*loc64 = get_fdesc(me, val+addend);
+				pr_debug("FDESC for %s at %llx points to %llx\n",
+				       strtab + sym->st_name, *loc64,
+				       ((Elf_Fdesc *)*loc64)->addr);
+			} else {
+				/* if the symbol is not local to this
+				 * module then val+addend is a pointer
+				 * to the function descriptor */
+				pr_debug("Non local FPTR64 Symbol %s loc %p val %llx\n",
+				       strtab + sym->st_name,
+				       loc, val);
+				*loc64 = val + addend;
+			}
+			break;
+
+		default:
+			printk(KERN_ERR "module %s: Unknown relocation: %Lu\n",
+			       me->name, ELF64_R_TYPE(rel[i].r_info));
+			return -ENOEXEC;
+		}
+	}
+	return 0;
+}
+#endif
+
+static void
+register_unwind_table(struct module *me,
+		      const Elf_Shdr *sechdrs)
+{
+	unsigned char *table, *end;
+	unsigned long gp;
+
+	if (!me->arch.unwind_section)
+		return;
+
+	table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
+	end = table + sechdrs[me->arch.unwind_section].sh_size;
+	gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset;
+
+	pr_debug("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
+	       me->arch.unwind_section, table, end, gp);
+	me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end);
+}
+
+static void
+deregister_unwind_table(struct module *me)
+{
+	if (me->arch.unwind)
+		unwind_table_remove(me->arch.unwind);
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+		    const Elf_Shdr *sechdrs,
+		    struct module *me)
+{
+	int i;
+	unsigned long nsyms;
+	const char *strtab = NULL;
+	const Elf_Shdr *s;
+	char *secstrings;
+	int symindex = -1;
+	Elf_Sym *newptr, *oldptr;
+	Elf_Shdr *symhdr = NULL;
+#ifdef DEBUG
+	Elf_Fdesc *entry;
+	u32 *addr;
+
+	entry = (Elf_Fdesc *)me->init;
+	printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry,
+	       entry->gp, entry->addr);
+	addr = (u32 *)entry->addr;
+	printk("INSNS: %x %x %x %x\n",
+	       addr[0], addr[1], addr[2], addr[3]);
+	printk("got entries used %ld, gots max %ld\n"
+	       "fdescs used %ld, fdescs max %ld\n",
+	       me->arch.got_count, me->arch.got_max,
+	       me->arch.fdesc_count, me->arch.fdesc_max);
+#endif
+
+	register_unwind_table(me, sechdrs);
+
+	/* haven't filled in me->symtab yet, so have to find it
+	 * ourselves */
+	for (i = 1; i < hdr->e_shnum; i++) {
+		if(sechdrs[i].sh_type == SHT_SYMTAB
+		   && (sechdrs[i].sh_flags & SHF_ALLOC)) {
+			int strindex = sechdrs[i].sh_link;
+			symindex = i;
+			/* FIXME: AWFUL HACK
+			 * The cast is to drop the const from
+			 * the sechdrs pointer */
+			symhdr = (Elf_Shdr *)&sechdrs[i];
+			strtab = (char *)sechdrs[strindex].sh_addr;
+			break;
+		}
+	}
+
+	pr_debug("module %s: strtab %p, symhdr %p\n",
+	       me->name, strtab, symhdr);
+
+	if(me->arch.got_count > MAX_GOTS) {
+		printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n",
+				me->name, me->arch.got_count, MAX_GOTS);
+		return -EINVAL;
+	}
+
+	kfree(me->arch.section);
+	me->arch.section = NULL;
+
+	/* no symbol table */
+	if(symhdr == NULL)
+		return 0;
+
+	oldptr = (void *)symhdr->sh_addr;
+	newptr = oldptr + 1;	/* we start counting at 1 */
+	nsyms = symhdr->sh_size / sizeof(Elf_Sym);
+	pr_debug("OLD num_symtab %lu\n", nsyms);
+
+	for (i = 1; i < nsyms; i++) {
+		oldptr++;	/* note, count starts at 1 so preincrement */
+		if(strncmp(strtab + oldptr->st_name,
+			      ".L", 2) == 0)
+			continue;
+
+		if(newptr != oldptr)
+			*newptr++ = *oldptr;
+		else
+			newptr++;
+
+	}
+	nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
+	pr_debug("NEW num_symtab %lu\n", nsyms);
+	symhdr->sh_size = nsyms * sizeof(Elf_Sym);
+
+	/* find .altinstructions section */
+	secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
+		void *aseg = (void *) s->sh_addr;
+		char *secname = secstrings + s->sh_name;
+
+		if (!strcmp(".altinstructions", secname))
+			/* patch .altinstructions */
+			apply_alternatives(aseg, aseg + s->sh_size, me->name);
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+		/* For 32 bit kernels we're compiling modules with
+		 * -ffunction-sections so we must relocate the addresses in the
+		 *  ftrace callsite section.
+		 */
+		if (symindex != -1 && !strcmp(secname, FTRACE_CALLSITE_SECTION)) {
+			int err;
+			if (s->sh_type == SHT_REL)
+				err = apply_relocate((Elf_Shdr *)sechdrs,
+							strtab, symindex,
+							s - sechdrs, me);
+			else if (s->sh_type == SHT_RELA)
+				err = apply_relocate_add((Elf_Shdr *)sechdrs,
+							strtab, symindex,
+							s - sechdrs, me);
+			if (err)
+				return err;
+		}
+#endif
+	}
+	return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+	deregister_unwind_table(mod);
+}
+
+#ifdef CONFIG_64BIT
+void *dereference_module_function_descriptor(struct module *mod, void *ptr)
+{
+	unsigned long start_opd = (Elf64_Addr)mod->core_layout.base +
+				   mod->arch.fdesc_offset;
+	unsigned long end_opd = start_opd +
+				mod->arch.fdesc_count * sizeof(Elf64_Fdesc);
+
+	if (ptr < (void *)start_opd || ptr >= (void *)end_opd)
+		return ptr;
+
+	return dereference_function_descriptor(ptr);
+}
+#endif