[PATCH] H8/300 module support update

[PATCH] H8/300 module support update

[Yoshinori Sato]

- add module support code
- add H8/300 ELF infomation
- fix kcore ELF format

-- 
Yoshinori Sato
<ysato@users.sourceforge.jp>

diff -Nur linux-2.6.6-bk4/arch/h8300/kernel/Makefile linux-2.6.6-h8300/arch/h8300/kernel/Makefile
--- linux-2.6.6-bk4/arch/h8300/kernel/Makefile	2004-05-11 14:30:25.000000000 +0900
+++ linux-2.6.6-h8300/arch/h8300/kernel/Makefile	2004-05-21 02:44:25.000000000 +0900
@@ -6,5 +6,6 @@
 
 obj-y := process.o traps.o ptrace.o ints.o \
 	 sys_h8300.o time.o semaphore.o signal.o \
-         setup.o h8300_ksyms.o gpio.o init_task.o \
-         syscalls.o
+         setup.o gpio.o init_task.o syscalls.o
+
+obj-$(CONFIG_MODULES) += module.o h8300_ksyms.o 
diff -Nur linux-2.6.6-bk4/arch/h8300/kernel/h8300_ksyms.c linux-2.6.6-h8300/arch/h8300/kernel/h8300_ksyms.c
--- linux-2.6.6-bk4/arch/h8300/kernel/h8300_ksyms.c	2004-01-09 16:00:03.000000000 +0900
+++ linux-2.6.6-h8300/arch/h8300/kernel/h8300_ksyms.c	2004-05-21 02:44:25.000000000 +0900
@@ -17,6 +17,7 @@
 #include <asm/checksum.h>
 #include <asm/hardirq.h>
 #include <asm/current.h>
+#include <asm/gpio.h>
 
 //asmlinkage long long __ashrdi3 (long long, int);
 //asmlinkage long long __lshrdi3 (long long, int);
@@ -38,8 +39,6 @@
 
 EXPORT_SYMBOL(ip_fast_csum);
 
-EXPORT_SYMBOL(mach_enable_irq);
-EXPORT_SYMBOL(mach_disable_irq);
 EXPORT_SYMBOL(kernel_thread);
 
 /* Networking helper routines. */
@@ -103,10 +102,10 @@
 EXPORT_SYMBOL_NOVERS(__umoddi3);
 EXPORT_SYMBOL_NOVERS(__umodsi3);
 
-EXPORT_SYMBOL_NOVERS(_current_task);
-
+#ifdef MAGIC_ROM_PTR
 EXPORT_SYMBOL_NOVERS(is_in_rom);
+#endif
 
-EXPORT_SYMBOL_NOVERS(h8300_reserved_gpio)
-EXPORT_SYMBOL_NOVERS(h8300_free_gpio)
-EXPORT_SYMBOL_NOVERS(h8300_set_gpio_dir)
+EXPORT_SYMBOL_NOVERS(h8300_reserved_gpio);
+EXPORT_SYMBOL_NOVERS(h8300_free_gpio);
+EXPORT_SYMBOL_NOVERS(h8300_set_gpio_dir);
diff -Nur linux-2.6.6-bk4/arch/h8300/kernel/module.c linux-2.6.6-h8300/arch/h8300/kernel/module.c
--- linux-2.6.6-bk4/arch/h8300/kernel/module.c	1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.6-h8300/arch/h8300/kernel/module.c	2004-05-21 02:44:25.000000000 +0900
@@ -0,0 +1,122 @@
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(fmt...)
+#endif
+
+void *module_alloc(unsigned long size)
+{
+	if (size == 0)
+		return NULL;
+	return vmalloc(size);
+}
+
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+	vfree(module_region);
+	/* FIXME: If module_region == mod->init_region, trim exception
+           table entries. */
+}
+
+/* We don't need anything special. */
+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 relsec,
+		   struct module *me)
+{
+	printk(KERN_ERR "module %s: RELOCATION unsupported\n",
+	       me->name);
+	return -ENOEXEC;
+}
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+		       const char *strtab,
+		       unsigned int symindex,
+		       unsigned int relsec,
+		       struct module *me)
+{
+	unsigned int i;
+	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
+
+	DEBUGP("Applying relocate section %u to %u\n", relsec,
+	       sechdrs[relsec].sh_info);
+	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
+		/* This is where to make the change */
+		uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
+					     + rela[i].r_offset);
+		/* This is the symbol it is referring to.  Note that all
+		   undefined symbols have been resolved.  */
+		Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+			+ ELF32_R_SYM(rela[i].r_info);
+		uint32_t v = sym->st_value + rela[i].r_addend;
+		uint32_t dot = sechdrs[symindex].sh_addr + rela[i].r_offset;
+
+		switch (ELF32_R_TYPE(rela[i].r_info)) {
+		case R_H8_DIR24R8:
+			loc = (uint32_t *)((uint32_t)loc - 1);
+			*loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
+			break;
+		case R_H8_DIR24A8:
+			*loc += v;
+			break;
+		case R_H8_DIR32:
+		case R_H8_DIR32A16:
+			*loc += v;
+			break;
+		case R_H8_PCREL16:
+			v -= dot + 2;
+			if ((Elf32_Sword)v > 0x7fff || 
+			    (Elf32_Sword)v < -(Elf32_Sword)0x8000)
+				goto overflow;
+			else 
+				*(unsigned short *)loc = v;
+			break;
+		case R_H8_PCREL8:
+			v -= dot + 1;
+			if ((Elf32_Sword)v > 0x7f || 
+			    (Elf32_Sword)v < -(Elf32_Sword)0x80)
+				goto overflow;
+			else 
+				*(unsigned char *)loc = v;
+			break;
+		default:
+			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+			       me->name, ELF32_R_TYPE(rela[i].r_info));
+			return -ENOEXEC;
+		}
+	}
+	return 0;
+ overflow:
+	printk(KERN_ERR "module %s: relocation offset overflow: %p\n",
+	       me->name, rela[i].r_offset);
+	return -ENOEXEC;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+		    const Elf_Shdr *sechdrs,
+		    struct module *me)
+{
+	return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+}
diff -Nur linux-2.6.6-bk4/arch/h8300/kernel/vmlinux.lds.S linux-2.6.6-h8300/arch/h8300/kernel/vmlinux.lds.S
--- linux-2.6.6-bk4/arch/h8300/kernel/vmlinux.lds.S	2004-05-21 02:17:15.000000000 +0900
+++ linux-2.6.6-h8300/arch/h8300/kernel/vmlinux.lds.S	2004-05-21 02:44:25.000000000 +0900
@@ -104,6 +104,21 @@
 		 *(__ksymtab)
 	___stop___ksymtab = .;
 
+	___start___ksymtab_gpl = .;	/* Kernel symbol table: GPL-only symbols */
+
+	*(__ksymtab_gpl)
+	___stop___ksymtab_gpl = .;
+
+	___start___kcrctab = .;	/* Kernel symbol table: Normal symbols */
+	*(__kcrctab)
+	___stop___kcrctab = .;
+
+	___start___kcrctab_gpl = .;	/* Kernel symbol table: GPL-only symbols */
+	*(__kcrctab_gpl)
+	___stop___kcrctab_gpl = .;
+
+	*(__ksymtab_strings)	/* Kernel symbol table: strings */
+
 	. = ALIGN(0x4) ;
 	__etext = . ;
 #if defined(CONFIG_ROMKERNEL)
diff -ur linux-2.6.6-bk4/fs/proc/kcore.c linux-2.6.6-h8300/fs/proc/kcore.c
--- linux-2.6.6-bk4/fs/proc/kcore.c	2004-01-09 15:59:43.000000000 +0900
+++ linux-2.6.6-h8300/fs/proc/kcore.c	2004-05-21 13:59:18.000000000 +0900
@@ -183,7 +183,11 @@
 	elf->e_entry	= 0;
 	elf->e_phoff	= sizeof(struct elfhdr);
 	elf->e_shoff	= 0;
+#if defined(CONFIG_H8300)
+	elf->e_flags	= ELF_FLAGS;
+#else
 	elf->e_flags	= 0;
+#endif
 	elf->e_ehsize	= sizeof(struct elfhdr);
 	elf->e_phentsize= sizeof(struct elf_phdr);
 	elf->e_phnum	= nphdr;
diff -ur linux-2.6.6-bk4/include/asm-h8300/elf.h linux-2.6.6-h8300/include/asm-h8300/elf.h
--- linux-2.6.6-bk4/include/asm-h8300/elf.h	2004-01-09 15:59:43.000000000 +0900
+++ linux-2.6.6-h8300/include/asm-h8300/elf.h	2004-05-21 13:59:17.000000000 +0900
@@ -13,26 +13,30 @@
 
 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
-
-typedef struct user_m68kfp_struct elf_fpregset_t;
+typedef unsigned long elf_fpregset_t;
 
 /*
  * This is used to ensure we don't load something for the wrong architecture.
  */
-#define elf_check_arch(x) ((x)->e_machine == EM_68K)
+#define elf_check_arch(x) ((x)->e_machine == EM_H8_300)
 
 /*
  * These are used to set parameters in the core dumps.
  */
 #define ELF_CLASS	ELFCLASS32
 #define ELF_DATA	ELFDATA2MSB
-#define ELF_ARCH	EM_H8_300H
+#define ELF_ARCH	EM_H8_300
+#if defined(__H8300H__)
+#define ELF_FLAGS       0x810000
+#endif
+#if defined(__H8300S__)
+#define ELF_FLAGS       0x820000
+#endif
 
 #define ELF_PLAT_INIT(_r)	_r->er1 = 0
 
 #define USE_ELF_CORE_DUMP
 #define ELF_EXEC_PAGESIZE	4096
-#endif
 
 /* 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
@@ -55,3 +59,49 @@
 #ifdef __KERNEL__
 #define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX)
 #endif
+
+#define R_H8_NONE       0
+#define R_H8_DIR32      1
+#define R_H8_DIR32_28   2
+#define R_H8_DIR32_24   3
+#define R_H8_DIR32_16   4
+#define R_H8_DIR32U     6
+#define R_H8_DIR32U_28  7
+#define R_H8_DIR32U_24  8
+#define R_H8_DIR32U_20  9
+#define R_H8_DIR32U_16 10
+#define R_H8_DIR24     11
+#define R_H8_DIR24_20  12
+#define R_H8_DIR24_16  13
+#define R_H8_DIR24U    14
+#define R_H8_DIR24U_20 15
+#define R_H8_DIR24U_16 16
+#define R_H8_DIR16     17
+#define R_H8_DIR16U    18
+#define R_H8_DIR16S_32 19
+#define R_H8_DIR16S_28 20
+#define R_H8_DIR16S_24 21
+#define R_H8_DIR16S_20 22
+#define R_H8_DIR16S    23
+#define R_H8_DIR8      24
+#define R_H8_DIR8U     25
+#define R_H8_DIR8Z_32  26
+#define R_H8_DIR8Z_28  27
+#define R_H8_DIR8Z_24  28
+#define R_H8_DIR8Z_20  29
+#define R_H8_DIR8Z_16  30
+#define R_H8_PCREL16   31
+#define R_H8_PCREL8    32
+#define R_H8_BPOS      33
+#define R_H8_PCREL32   34
+#define R_H8_GOT32O    35
+#define R_H8_GOT16O    36
+#define R_H8_DIR16A8   59
+#define R_H8_DIR16R8   60
+#define R_H8_DIR24A8   61
+#define R_H8_DIR24R8   62
+#define R_H8_DIR32A16  63
+#define R_H8_ABS32     65
+#define R_H8_ABS32A16 127
+
+#endif
diff -ur linux-2.6.6-bk4/include/asm-h8300/module.h linux-2.6.6-h8300/include/asm-h8300/module.h
--- linux-2.6.6-bk4/include/asm-h8300/module.h	2004-05-11 14:30:12.000000000 +0900
+++ linux-2.6.6-h8300/include/asm-h8300/module.h	2004-05-21 02:07:48.000000000 +0900
@@ -3,5 +3,9 @@
 /*
  * This file contains the H8/300 architecture specific module code.
  */
+struct mod_arch_specific { };
+#define Elf_Shdr Elf32_Shdr
+#define Elf_Sym Elf32_Sym
+#define Elf_Ehdr Elf32_Ehdr
 
 #endif /* _ASM_H8/300_MODULE_H */
diff -ur linux-2.6.6-bk4/include/linux/elf.h linux-2.6.6-h8300/include/linux/elf.h
--- linux-2.6.6-bk4/include/linux/elf.h	2004-05-11 14:30:47.000000000 +0900
+++ linux-2.6.6-h8300/include/linux/elf.h	2004-05-21 02:55:24.000000000 +0900
@@ -81,8 +81,7 @@
 
 #define EM_V850		87	/* NEC v850 */
 
-#define EM_H8_300H      47      /* Hitachi H8/300H */
-#define EM_H8S          48      /* Hitachi H8S     */
+#define EM_H8_300       46      /* Hitachi H8/300,300H,H8S */
 
 /*
  * This is an interim value that we will use until the committee comes