unicore32 core architecture: generic elf and ksyms stuff

This patch includes some generic stuff including elf and ksyms.
Because all one-line asm-generic headers are auto-generated by ASM_GENERIC_HEADERS
in arch/unicore32/Makefile, so the rest seems very little.
ELF handling functions and module handling functions are also here.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

arch/unicore32/include/asm/elf.h

@@ -0,0 +1,94 @@
+/*
+ * linux/arch/unicore32/include/asm/elf.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __UNICORE_ELF_H__
+#define __UNICORE_ELF_H__
+
+#include <asm/hwcap.h>
+
+/*
+ * ELF register definitions..
+ */
+#include <asm/ptrace.h>
+
+typedef unsigned long elf_greg_t;
+typedef unsigned long elf_freg_t[3];
+
+#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef struct fp_state elf_fpregset_t;
+
+#define EM_UNICORE		110
+
+#define R_UNICORE_NONE		0
+#define R_UNICORE_PC24		1
+#define R_UNICORE_ABS32		2
+#define R_UNICORE_CALL		28
+#define R_UNICORE_JUMP24	29
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS	ELFCLASS32
+#define ELF_DATA	ELFDATA2LSB
+#define ELF_ARCH	EM_UNICORE
+
+/*
+ * This yields a string that ld.so will use to load implementation
+ * specific libraries for optimization.  This is more specific in
+ * intent than poking at uname or /proc/cpuinfo.
+ *
+ */
+#define ELF_PLATFORM_SIZE 8
+#define ELF_PLATFORM	(elf_platform)
+
+extern char elf_platform[];
+
+struct elf32_hdr;
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+extern int elf_check_arch(const struct elf32_hdr *);
+#define elf_check_arch elf_check_arch
+
+struct task_struct;
+int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs);
+#define ELF_CORE_COPY_TASK_REGS dump_task_regs
+
+#define ELF_EXEC_PAGESIZE	4096
+
+/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
+   use of this is to invoke "./ld.so someprog" to test out a new version of
+   the loader.  We need to make sure that it is out of the way of the program
+   that it will "exec", and that there is sufficient room for the brk.  */
+
+#define ELF_ET_DYN_BASE	(2 * TASK_SIZE / 3)
+
+/* When the program starts, a1 contains a pointer to a function to be
+   registered with atexit, as per the SVR4 ABI.  A value of 0 means we
+   have no such handler.  */
+#define ELF_PLAT_INIT(_r, load_addr)	{(_r)->UCreg_00 = 0; }
+
+extern void elf_set_personality(const struct elf32_hdr *);
+#define SET_PERSONALITY(ex)	elf_set_personality(&(ex))
+
+struct mm_struct;
+extern unsigned long arch_randomize_brk(struct mm_struct *mm);
+#define arch_randomize_brk arch_randomize_brk
+
+extern int vectors_user_mapping(void);
+#define arch_setup_additional_pages(bprm, uses_interp) vectors_user_mapping()
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
+
+#endif

arch/unicore32/include/asm/string.h

@@ -0,0 +1,38 @@
+/*
+ * linux/arch/unicore32/include/asm/string.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_STRING_H__
+#define __UNICORE_STRING_H__
+
+/*
+ * We don't do inline string functions, since the
+ * optimised inline asm versions are not small.
+ */
+
+#define __HAVE_ARCH_STRRCHR
+extern char *strrchr(const char *s, int c);
+
+#define __HAVE_ARCH_STRCHR
+extern char *strchr(const char *s, int c);
+
+#define __HAVE_ARCH_MEMCPY
+extern void *memcpy(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMCHR
+extern void *memchr(const void *, int, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *, int, __kernel_size_t);
+
+#endif

arch/unicore32/kernel/asm-offsets.c

@@ -0,0 +1,112 @@
+/*
+ * linux/arch/unicore32/kernel/asm-offsets.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed to extract
+ * and format the required data.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/kbuild.h>
+#include <linux/suspend.h>
+#include <linux/thread_info.h>
+#include <asm/memory.h>
+#include <asm/suspend.h>
+
+/*
+ * GCC 3.0, 3.1: general bad code generation.
+ * GCC 3.2.0: incorrect function argument offset calculation.
+ * GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
+ *	(http://gcc.gnu.org/PR8896) and incorrect structure
+ *		initialisation in fs/jffs2/erase.c
+ */
+#if (__GNUC__ < 4)
+#error Your compiler should upgrade to uc4
+#error	Known good compilers: 4.2.2
+#endif
+
+int main(void)
+{
+	DEFINE(TSK_ACTIVE_MM,	offsetof(struct task_struct, active_mm));
+	BLANK();
+	DEFINE(TI_FLAGS,	offsetof(struct thread_info, flags));
+	DEFINE(TI_PREEMPT,	offsetof(struct thread_info, preempt_count));
+	DEFINE(TI_ADDR_LIMIT,	offsetof(struct thread_info, addr_limit));
+	DEFINE(TI_TASK,		offsetof(struct thread_info, task));
+	DEFINE(TI_EXEC_DOMAIN,	offsetof(struct thread_info, exec_domain));
+	DEFINE(TI_CPU,		offsetof(struct thread_info, cpu));
+	DEFINE(TI_CPU_SAVE,	offsetof(struct thread_info, cpu_context));
+	DEFINE(TI_USED_CP,	offsetof(struct thread_info, used_cp));
+#ifdef CONFIG_UNICORE_FPU_F64
+	DEFINE(TI_FPSTATE,	offsetof(struct thread_info, fpstate));
+#endif
+	BLANK();
+	DEFINE(S_R0,		offsetof(struct pt_regs, UCreg_00));
+	DEFINE(S_R1,		offsetof(struct pt_regs, UCreg_01));
+	DEFINE(S_R2,		offsetof(struct pt_regs, UCreg_02));
+	DEFINE(S_R3,		offsetof(struct pt_regs, UCreg_03));
+	DEFINE(S_R4,		offsetof(struct pt_regs, UCreg_04));
+	DEFINE(S_R5,		offsetof(struct pt_regs, UCreg_05));
+	DEFINE(S_R6,		offsetof(struct pt_regs, UCreg_06));
+	DEFINE(S_R7,		offsetof(struct pt_regs, UCreg_07));
+	DEFINE(S_R8,		offsetof(struct pt_regs, UCreg_08));
+	DEFINE(S_R9,		offsetof(struct pt_regs, UCreg_09));
+	DEFINE(S_R10,		offsetof(struct pt_regs, UCreg_10));
+	DEFINE(S_R11,		offsetof(struct pt_regs, UCreg_11));
+	DEFINE(S_R12,		offsetof(struct pt_regs, UCreg_12));
+	DEFINE(S_R13,		offsetof(struct pt_regs, UCreg_13));
+	DEFINE(S_R14,		offsetof(struct pt_regs, UCreg_14));
+	DEFINE(S_R15,		offsetof(struct pt_regs, UCreg_15));
+	DEFINE(S_R16,		offsetof(struct pt_regs, UCreg_16));
+	DEFINE(S_R17,		offsetof(struct pt_regs, UCreg_17));
+	DEFINE(S_R18,		offsetof(struct pt_regs, UCreg_18));
+	DEFINE(S_R19,		offsetof(struct pt_regs, UCreg_19));
+	DEFINE(S_R20,		offsetof(struct pt_regs, UCreg_20));
+	DEFINE(S_R21,		offsetof(struct pt_regs, UCreg_21));
+	DEFINE(S_R22,		offsetof(struct pt_regs, UCreg_22));
+	DEFINE(S_R23,		offsetof(struct pt_regs, UCreg_23));
+	DEFINE(S_R24,		offsetof(struct pt_regs, UCreg_24));
+	DEFINE(S_R25,		offsetof(struct pt_regs, UCreg_25));
+	DEFINE(S_R26,		offsetof(struct pt_regs, UCreg_26));
+	DEFINE(S_FP,		offsetof(struct pt_regs, UCreg_fp));
+	DEFINE(S_IP,		offsetof(struct pt_regs, UCreg_ip));
+	DEFINE(S_SP,		offsetof(struct pt_regs, UCreg_sp));
+	DEFINE(S_LR,		offsetof(struct pt_regs, UCreg_lr));
+	DEFINE(S_PC,		offsetof(struct pt_regs, UCreg_pc));
+	DEFINE(S_PSR,		offsetof(struct pt_regs, UCreg_asr));
+	DEFINE(S_OLD_R0,	offsetof(struct pt_regs, UCreg_ORIG_00));
+	DEFINE(S_FRAME_SIZE,	sizeof(struct pt_regs));
+	BLANK();
+	DEFINE(VMA_VM_MM,	offsetof(struct vm_area_struct, vm_mm));
+	DEFINE(VMA_VM_FLAGS,	offsetof(struct vm_area_struct, vm_flags));
+	BLANK();
+	DEFINE(VM_EXEC,		VM_EXEC);
+	BLANK();
+	DEFINE(PAGE_SZ,		PAGE_SIZE);
+	BLANK();
+	DEFINE(SYS_ERROR0,	0x9f0000);
+	BLANK();
+	DEFINE(PBE_ADDRESS,		offsetof(struct pbe, address));
+	DEFINE(PBE_ORIN_ADDRESS,	offsetof(struct pbe, orig_address));
+	DEFINE(PBE_NEXT,		offsetof(struct pbe, next));
+	DEFINE(SWSUSP_CPU,		offsetof(struct swsusp_arch_regs, \
+							cpu_context));
+#ifdef	CONFIG_UNICORE_FPU_F64
+	DEFINE(SWSUSP_FPSTATE,		offsetof(struct swsusp_arch_regs, \
+							fpstate));
+#endif
+	BLANK();
+	DEFINE(DMA_BIDIRECTIONAL,	DMA_BIDIRECTIONAL);
+	DEFINE(DMA_TO_DEVICE,		DMA_TO_DEVICE);
+	DEFINE(DMA_FROM_DEVICE,		DMA_FROM_DEVICE);
+	return 0;
+}

arch/unicore32/kernel/elf.c

@@ -0,0 +1,38 @@
+/*
+ * linux/arch/unicore32/kernel/elf.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/personality.h>
+#include <linux/binfmts.h>
+#include <linux/elf.h>
+
+int elf_check_arch(const struct elf32_hdr *x)
+{
+	/* Make sure it's an UniCore executable */
+	if (x->e_machine != EM_UNICORE)
+		return 0;
+
+	/* Make sure the entry address is reasonable */
+	if (x->e_entry & 3)
+		return 0;
+
+	return 1;
+}
+EXPORT_SYMBOL(elf_check_arch);
+
+void elf_set_personality(const struct elf32_hdr *x)
+{
+	unsigned int personality = PER_LINUX;
+
+	set_personality(personality);
+}
+EXPORT_SYMBOL(elf_set_personality);

arch/unicore32/kernel/ksyms.c

@@ -0,0 +1,99 @@
+/*
+ * linux/arch/unicore32/kernel/ksyms.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/cryptohash.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/checksum.h>
+#include <asm/system.h>
+
+#include "ksyms.h"
+
+EXPORT_SYMBOL(__uc32_find_next_zero_bit);
+EXPORT_SYMBOL(__uc32_find_next_bit);
+
+EXPORT_SYMBOL(__backtrace);
+
+	/* platform dependent support */
+EXPORT_SYMBOL(__udelay);
+EXPORT_SYMBOL(__const_udelay);
+
+	/* networking */
+EXPORT_SYMBOL(csum_partial);
+EXPORT_SYMBOL(csum_partial_copy_from_user);
+EXPORT_SYMBOL(csum_partial_copy_nocheck);
+EXPORT_SYMBOL(__csum_ipv6_magic);
+
+	/* io */
+#ifndef __raw_readsb
+EXPORT_SYMBOL(__raw_readsb);
+#endif
+#ifndef __raw_readsw
+EXPORT_SYMBOL(__raw_readsw);
+#endif
+#ifndef __raw_readsl
+EXPORT_SYMBOL(__raw_readsl);
+#endif
+#ifndef __raw_writesb
+EXPORT_SYMBOL(__raw_writesb);
+#endif
+#ifndef __raw_writesw
+EXPORT_SYMBOL(__raw_writesw);
+#endif
+#ifndef __raw_writesl
+EXPORT_SYMBOL(__raw_writesl);
+#endif
+
+	/* string / mem functions */
+EXPORT_SYMBOL(strchr);
+EXPORT_SYMBOL(strrchr);
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(memchr);
+
+	/* user mem (segment) */
+EXPORT_SYMBOL(__strnlen_user);
+EXPORT_SYMBOL(__strncpy_from_user);
+
+EXPORT_SYMBOL(copy_page);
+
+EXPORT_SYMBOL(__copy_from_user);
+EXPORT_SYMBOL(__copy_to_user);
+EXPORT_SYMBOL(__clear_user);
+
+EXPORT_SYMBOL(__get_user_1);
+EXPORT_SYMBOL(__get_user_2);
+EXPORT_SYMBOL(__get_user_4);
+
+EXPORT_SYMBOL(__put_user_1);
+EXPORT_SYMBOL(__put_user_2);
+EXPORT_SYMBOL(__put_user_4);
+EXPORT_SYMBOL(__put_user_8);
+
+EXPORT_SYMBOL(__ashldi3);
+EXPORT_SYMBOL(__ashrdi3);
+EXPORT_SYMBOL(__divsi3);
+EXPORT_SYMBOL(__lshrdi3);
+EXPORT_SYMBOL(__modsi3);
+EXPORT_SYMBOL(__muldi3);
+EXPORT_SYMBOL(__ucmpdi2);
+EXPORT_SYMBOL(__udivsi3);
+EXPORT_SYMBOL(__umodsi3);
+EXPORT_SYMBOL(__bswapsi2);
+

arch/unicore32/kernel/ksyms.h

@@ -0,0 +1,15 @@
+/*
+ * libgcc functions - functions that are used internally by the
+ * compiler...  (prototypes are not correct though, but that
+ * doesn't really matter since they're not versioned).
+ */
+extern void __ashldi3(void);
+extern void __ashrdi3(void);
+extern void __divsi3(void);
+extern void __lshrdi3(void);
+extern void __modsi3(void);
+extern void __muldi3(void);
+extern void __ucmpdi2(void);
+extern void __udivsi3(void);
+extern void __umodsi3(void);
+extern void __bswapsi2(void);

arch/unicore32/kernel/module.c

@@ -0,0 +1,152 @@
+/*
+ * linux/arch/unicore32/kernel/module.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/moduleloader.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/gfp.h>
+
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+
+void *module_alloc(unsigned long size)
+{
+	struct vm_struct *area;
+
+	size = PAGE_ALIGN(size);
+	if (!size)
+		return NULL;
+
+	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
+	if (!area)
+		return NULL;
+
+	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
+}
+
+void module_free(struct module *module, void *region)
+{
+	vfree(region);
+}
+
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+			      Elf_Shdr *sechdrs,
+			      char *secstrings,
+			      struct module *mod)
+{
+	return 0;
+}
+
+int
+apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
+	       unsigned int relindex, struct module *module)
+{
+	Elf32_Shdr *symsec = sechdrs + symindex;
+	Elf32_Shdr *relsec = sechdrs + relindex;
+	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
+	Elf32_Rel *rel = (void *)relsec->sh_addr;
+	unsigned int i;
+
+	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
+		unsigned long loc;
+		Elf32_Sym *sym;
+		s32 offset;
+
+		offset = ELF32_R_SYM(rel->r_info);
+		if (offset < 0 || offset >
+				(symsec->sh_size / sizeof(Elf32_Sym))) {
+			printk(KERN_ERR "%s: bad relocation, "
+					"section %d reloc %d\n",
+					module->name, relindex, i);
+			return -ENOEXEC;
+		}
+
+		sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
+
+		if (rel->r_offset < 0 || rel->r_offset >
+				dstsec->sh_size - sizeof(u32)) {
+			printk(KERN_ERR "%s: out of bounds relocation, "
+				"section %d reloc %d offset %d size %d\n",
+				module->name, relindex, i, rel->r_offset,
+				dstsec->sh_size);
+			return -ENOEXEC;
+		}
+
+		loc = dstsec->sh_addr + rel->r_offset;
+
+		switch (ELF32_R_TYPE(rel->r_info)) {
+		case R_UNICORE_NONE:
+			/* ignore */
+			break;
+
+		case R_UNICORE_ABS32:
+			*(u32 *)loc += sym->st_value;
+			break;
+
+		case R_UNICORE_PC24:
+		case R_UNICORE_CALL:
+		case R_UNICORE_JUMP24:
+			offset = (*(u32 *)loc & 0x00ffffff) << 2;
+			if (offset & 0x02000000)
+				offset -= 0x04000000;
+
+			offset += sym->st_value - loc;
+			if (offset & 3 ||
+			    offset <= (s32)0xfe000000 ||
+			    offset >= (s32)0x02000000) {
+				printk(KERN_ERR
+				       "%s: relocation out of range, section "
+				       "%d reloc %d sym '%s'\n", module->name,
+				       relindex, i, strtab + sym->st_name);
+				return -ENOEXEC;
+			}
+
+			offset >>= 2;
+
+			*(u32 *)loc &= 0xff000000;
+			*(u32 *)loc |= offset & 0x00ffffff;
+			break;
+
+		default:
+			printk(KERN_ERR "%s: unknown relocation: %u\n",
+			       module->name, ELF32_R_TYPE(rel->r_info));
+			return -ENOEXEC;
+		}
+	}
+	return 0;
+}
+
+int
+apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+		   unsigned int symindex, unsigned int relsec,
+		   struct module *module)
+{
+	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+	       module->name);
+	return -ENOEXEC;
+}
+
+int
+module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
+		struct module *module)
+{
+	return 0;
+}
+
+void
+module_arch_cleanup(struct module *mod)
+{
+}

arch/unicore32/mm/proc-syms.c

@@ -0,0 +1,23 @@
+/*
+ * linux/arch/unicore32/mm/proc-syms.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/page.h>
+
+EXPORT_SYMBOL(cpu_dcache_clean_area);
+EXPORT_SYMBOL(cpu_set_pte);
+
+EXPORT_SYMBOL(__cpuc_dma_flush_range);
+EXPORT_SYMBOL(__cpuc_dma_clean_range);