Commit 9d056df0 authored by Guo Ren's avatar Guo Ren
Browse files

csky: ELF and module probe 



This patch adds ELF definition and module relocate codes.

Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
parent a0ae6280

arch/csky/abiv1/inc/abi/elf.h

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/* SPDX-License-Identifier: GPL-2.0 */



#ifndef __ABI_CSKY_ELF_H

#define __ABI_CSKY_ELF_H



#define ELF_CORE_COPY_REGS(pr_reg, regs) do {	\

	pr_reg[0] = regs->pc;			\

	pr_reg[1] = regs->regs[9];		\

	pr_reg[2] = regs->usp;			\

	pr_reg[3] = regs->sr;			\

	pr_reg[4] = regs->a0;			\

	pr_reg[5] = regs->a1;			\

	pr_reg[6] = regs->a2;			\

	pr_reg[7] = regs->a3;			\

	pr_reg[8] = regs->regs[0];		\

	pr_reg[9] = regs->regs[1];		\

	pr_reg[10] = regs->regs[2];		\

	pr_reg[11] = regs->regs[3];		\

	pr_reg[12] = regs->regs[4];		\

	pr_reg[13] = regs->regs[5];		\

	pr_reg[14] = regs->regs[6];		\

	pr_reg[15] = regs->regs[7];		\

	pr_reg[16] = regs->regs[8];		\

	pr_reg[17] = regs->lr;			\

} while (0);

#endif /* __ABI_CSKY_ELF_H */

arch/csky/abiv2/inc/abi/elf.h

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/* SPDX-License-Identifier: GPL-2.0 */



#ifndef __ABI_CSKY_ELF_H

#define __ABI_CSKY_ELF_H



/* The member sort in array pr_reg[x] is defined by GDB. */

#define ELF_CORE_COPY_REGS(pr_reg, regs) do {	\

	pr_reg[0] = regs->pc;			\

	pr_reg[1] = regs->a1;			\

	pr_reg[2] = regs->a0;			\

	pr_reg[3] = regs->sr;			\

	pr_reg[4] = regs->a2;			\

	pr_reg[5] = regs->a3;			\

	pr_reg[6] = regs->regs[0];		\

	pr_reg[7] = regs->regs[1];		\

	pr_reg[8] = regs->regs[2];		\

	pr_reg[9] = regs->regs[3];		\

	pr_reg[10] = regs->regs[4];		\

	pr_reg[11] = regs->regs[5];		\

	pr_reg[12] = regs->regs[6];		\

	pr_reg[13] = regs->regs[7];		\

	pr_reg[14] = regs->regs[8];		\

	pr_reg[15] = regs->regs[9];		\

	pr_reg[16] = regs->usp;			\

	pr_reg[17] = regs->lr;			\

	pr_reg[18] = regs->exregs[0];		\

	pr_reg[19] = regs->exregs[1];		\

	pr_reg[20] = regs->exregs[2];		\

	pr_reg[21] = regs->exregs[3];		\

	pr_reg[22] = regs->exregs[4];		\

	pr_reg[23] = regs->exregs[5];		\

	pr_reg[24] = regs->exregs[6];		\

	pr_reg[25] = regs->exregs[7];		\

	pr_reg[26] = regs->exregs[8];		\

	pr_reg[27] = regs->exregs[9];		\

	pr_reg[28] = regs->exregs[10];		\

	pr_reg[29] = regs->exregs[11];		\

	pr_reg[30] = regs->exregs[12];		\

	pr_reg[31] = regs->exregs[13];		\

	pr_reg[32] = regs->exregs[14];		\

	pr_reg[33] = regs->tls;			\

} while (0);

#endif /* __ABI_CSKY_ELF_H */

arch/csky/include/asm/elf.h

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/* SPDX-License-Identifier: GPL-2.0 */

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#ifndef __ASM_CSKY_ELF_H

#define __ASM_CSKY_ELF_H



#include <asm/ptrace.h>

#include <abi/regdef.h>



#define ELF_ARCH 252



/* CSKY Relocations */

#define R_CSKY_NONE               0

#define R_CSKY_32                 1

#define R_CSKY_PCIMM8BY4          2

#define R_CSKY_PCIMM11BY2         3

#define R_CSKY_PCIMM4BY2          4

#define R_CSKY_PC32               5

#define R_CSKY_PCRELJSR_IMM11BY2  6

#define R_CSKY_GNU_VTINHERIT      7

#define R_CSKY_GNU_VTENTRY        8

#define R_CSKY_RELATIVE           9

#define R_CSKY_COPY               10

#define R_CSKY_GLOB_DAT           11

#define R_CSKY_JUMP_SLOT          12

#define R_CSKY_ADDR_HI16          24

#define R_CSKY_ADDR_LO16          25

#define R_CSKY_PCRELJSR_IMM26BY2  40



typedef unsigned long elf_greg_t;



typedef struct user_fp elf_fpregset_t;



#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))



typedef elf_greg_t elf_gregset_t[ELF_NGREG];



/*

 * This is used to ensure we don't load something for the wrong architecture.

 */

#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)



/*

 * These are used to set parameters in the core dumps.

 */

#define USE_ELF_CORE_DUMP

#define ELF_EXEC_PAGESIZE		4096

#define ELF_CLASS			ELFCLASS32

#define ELF_PLAT_INIT(_r, load_addr)	{ _r->a0 = 0; }



#ifdef __cskyBE__

#define ELF_DATA	ELFDATA2MSB

#else

#define ELF_DATA	ELFDATA2LSB

#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

 * 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	0x0UL

#include <abi/elf.h>



/* Similar, but for a thread other than current. */

struct task_struct;

extern int dump_task_regs(struct task_struct *tsk, elf_gregset_t *elf_regs);

#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)



#define ELF_HWCAP	(0)



/*

 * 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		(NULL)

#define SET_PERSONALITY(ex)	set_personality(PER_LINUX)



#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1

struct linux_binprm;

extern int arch_setup_additional_pages(struct linux_binprm *bprm,

				       int uses_interp);

#endif /* __ASM_CSKY_ELF_H */

arch/csky/kernel/module.c

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// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#include <linux/moduleloader.h>

#include <linux/elf.h>

#include <linux/mm.h>

#include <linux/vmalloc.h>

#include <linux/slab.h>

#include <linux/fs.h>

#include <linux/string.h>

#include <linux/kernel.h>

#include <linux/spinlock.h>

#include <asm/pgtable.h>



#if defined(__CSKYABIV2__)

#define IS_BSR32(hi16, lo16)		(((hi16) & 0xFC00) == 0xE000)

#define IS_JSRI32(hi16, lo16)		((hi16) == 0xEAE0)



#define CHANGE_JSRI_TO_LRW(addr) do {					\

	*(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a;	\

	*((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF;	\

} while (0)



#define SET_JSR32_R26(addr) do {		\

	*(uint16_t *)(addr) = 0xE8Fa;		\

	*((uint16_t *)(addr) + 1) = 0x0000;	\

} while (0)

#endif



int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,

		unsigned int symindex, unsigned int relsec, struct module *me)

{

	unsigned int i;

	Elf32_Rela	*rel = (void *) sechdrs[relsec].sh_addr;

	Elf32_Sym	*sym;

	uint32_t	*location;

	short		*temp;

#if defined(__CSKYABIV2__)

	uint16_t	*location_tmp;

#endif



	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {

		/* This is where to make the change */

		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr

							+ rel[i].r_offset;

		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr

						+ ELF32_R_SYM(rel[i].r_info);



		switch (ELF32_R_TYPE(rel[i].r_info)) {

		case R_CSKY_32:

			/* We add the value into the location given */

			*location = rel[i].r_addend + sym->st_value;

			break;

		case R_CSKY_PC32:

			/* Add the value, subtract its postition */

			*location = rel[i].r_addend + sym->st_value

							- (uint32_t)location;

			break;

		case R_CSKY_PCRELJSR_IMM11BY2:

			break;

		case R_CSKY_PCRELJSR_IMM26BY2:

#if defined(__CSKYABIV2__)

			location_tmp = (uint16_t *)location;

			if (IS_BSR32(*location_tmp, *(location_tmp + 1)))

				break;



			if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {

				/* jsri 0x...  --> lrw r26, 0x... */

				CHANGE_JSRI_TO_LRW(location);

				/* lsli r0, r0 --> jsr r26 */

				SET_JSR32_R26(location + 1);

			}

#endif

			break;

		case R_CSKY_ADDR_HI16:

			temp = ((short  *)location) + 1;

			*temp = (short)

				((rel[i].r_addend + sym->st_value) >> 16);

			break;

		case R_CSKY_ADDR_LO16:

			temp = ((short  *)location) + 1;

			*temp = (short)

				((rel[i].r_addend + sym->st_value) & 0xffff);

			break;

		default:

			pr_err("module %s: Unknown relocation: %u\n",

				me->name, ELF32_R_TYPE(rel[i].r_info));

			return -ENOEXEC;

		}

	}

	return 0;

}

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