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csky: ELF and module probe
This patch adds ELF definition and module relocate codes. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren
parent
a0ae62806f
commit
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4 changed files with 246 additions and 0 deletions
26
arch/csky/abiv1/inc/abi/elf.h
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26
arch/csky/abiv1/inc/abi/elf.h
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ABI_CSKY_ELF_H
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#define __ABI_CSKY_ELF_H
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#define ELF_CORE_COPY_REGS(pr_reg, regs) do { \
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pr_reg[0] = regs->pc; \
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pr_reg[1] = regs->regs[9]; \
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pr_reg[2] = regs->usp; \
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pr_reg[3] = regs->sr; \
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pr_reg[4] = regs->a0; \
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pr_reg[5] = regs->a1; \
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pr_reg[6] = regs->a2; \
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pr_reg[7] = regs->a3; \
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pr_reg[8] = regs->regs[0]; \
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pr_reg[9] = regs->regs[1]; \
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pr_reg[10] = regs->regs[2]; \
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pr_reg[11] = regs->regs[3]; \
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pr_reg[12] = regs->regs[4]; \
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pr_reg[13] = regs->regs[5]; \
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pr_reg[14] = regs->regs[6]; \
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pr_reg[15] = regs->regs[7]; \
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pr_reg[16] = regs->regs[8]; \
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pr_reg[17] = regs->lr; \
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} while (0);
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#endif /* __ABI_CSKY_ELF_H */
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43
arch/csky/abiv2/inc/abi/elf.h
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arch/csky/abiv2/inc/abi/elf.h
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ABI_CSKY_ELF_H
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#define __ABI_CSKY_ELF_H
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/* The member sort in array pr_reg[x] is defined by GDB. */
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#define ELF_CORE_COPY_REGS(pr_reg, regs) do { \
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pr_reg[0] = regs->pc; \
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pr_reg[1] = regs->a1; \
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pr_reg[2] = regs->a0; \
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pr_reg[3] = regs->sr; \
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pr_reg[4] = regs->a2; \
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pr_reg[5] = regs->a3; \
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pr_reg[6] = regs->regs[0]; \
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pr_reg[7] = regs->regs[1]; \
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pr_reg[8] = regs->regs[2]; \
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pr_reg[9] = regs->regs[3]; \
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pr_reg[10] = regs->regs[4]; \
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pr_reg[11] = regs->regs[5]; \
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pr_reg[12] = regs->regs[6]; \
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pr_reg[13] = regs->regs[7]; \
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pr_reg[14] = regs->regs[8]; \
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pr_reg[15] = regs->regs[9]; \
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pr_reg[16] = regs->usp; \
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pr_reg[17] = regs->lr; \
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pr_reg[18] = regs->exregs[0]; \
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pr_reg[19] = regs->exregs[1]; \
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pr_reg[20] = regs->exregs[2]; \
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pr_reg[21] = regs->exregs[3]; \
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pr_reg[22] = regs->exregs[4]; \
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pr_reg[23] = regs->exregs[5]; \
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pr_reg[24] = regs->exregs[6]; \
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pr_reg[25] = regs->exregs[7]; \
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pr_reg[26] = regs->exregs[8]; \
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pr_reg[27] = regs->exregs[9]; \
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pr_reg[28] = regs->exregs[10]; \
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pr_reg[29] = regs->exregs[11]; \
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pr_reg[30] = regs->exregs[12]; \
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pr_reg[31] = regs->exregs[13]; \
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pr_reg[32] = regs->exregs[14]; \
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pr_reg[33] = regs->tls; \
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} while (0);
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#endif /* __ABI_CSKY_ELF_H */
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85
arch/csky/include/asm/elf.h
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arch/csky/include/asm/elf.h
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_ELF_H
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#define __ASM_CSKY_ELF_H
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#include <asm/ptrace.h>
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#include <abi/regdef.h>
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#define ELF_ARCH 252
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/* CSKY Relocations */
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#define R_CSKY_NONE 0
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#define R_CSKY_32 1
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#define R_CSKY_PCIMM8BY4 2
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#define R_CSKY_PCIMM11BY2 3
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#define R_CSKY_PCIMM4BY2 4
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#define R_CSKY_PC32 5
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#define R_CSKY_PCRELJSR_IMM11BY2 6
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#define R_CSKY_GNU_VTINHERIT 7
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#define R_CSKY_GNU_VTENTRY 8
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#define R_CSKY_RELATIVE 9
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#define R_CSKY_COPY 10
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#define R_CSKY_GLOB_DAT 11
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#define R_CSKY_JUMP_SLOT 12
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#define R_CSKY_ADDR_HI16 24
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#define R_CSKY_ADDR_LO16 25
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#define R_CSKY_PCRELJSR_IMM26BY2 40
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typedef unsigned long elf_greg_t;
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typedef struct user_fp elf_fpregset_t;
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#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096
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#define ELF_CLASS ELFCLASS32
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#define ELF_PLAT_INIT(_r, load_addr) { _r->a0 = 0; }
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#ifdef __cskyBE__
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#define ELF_DATA ELFDATA2MSB
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#else
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#define ELF_DATA ELFDATA2LSB
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#endif
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/*
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* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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* use of this is to invoke "./ld.so someprog" to test out a new version of
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* the loader. We need to make sure that it is out of the way of the program
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* that it will "exec", and that there is sufficient room for the brk.
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*/
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#define ELF_ET_DYN_BASE 0x0UL
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#include <abi/elf.h>
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/* Similar, but for a thread other than current. */
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struct task_struct;
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extern int dump_task_regs(struct task_struct *tsk, elf_gregset_t *elf_regs);
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#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
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#define ELF_HWCAP (0)
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/*
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* This yields a string that ld.so will use to load implementation specific
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* libraries for optimization. This is more specific in intent than poking
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* at uname or /proc/cpuinfo.
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*/
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#define ELF_PLATFORM (NULL)
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#define SET_PERSONALITY(ex) set_personality(PER_LINUX)
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
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struct linux_binprm;
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extern int arch_setup_additional_pages(struct linux_binprm *bprm,
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int uses_interp);
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#endif /* __ASM_CSKY_ELF_H */
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92
arch/csky/kernel/module.c
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arch/csky/kernel/module.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <asm/pgtable.h>
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#if defined(__CSKYABIV2__)
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#define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
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#define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
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#define CHANGE_JSRI_TO_LRW(addr) do { \
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*(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
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*((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
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} while (0)
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#define SET_JSR32_R26(addr) do { \
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*(uint16_t *)(addr) = 0xE8Fa; \
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*((uint16_t *)(addr) + 1) = 0x0000; \
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} while (0)
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#endif
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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec, struct module *me)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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uint32_t *location;
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short *temp;
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#if defined(__CSKYABIV2__)
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uint16_t *location_tmp;
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#endif
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_CSKY_32:
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/* We add the value into the location given */
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*location = rel[i].r_addend + sym->st_value;
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break;
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case R_CSKY_PC32:
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/* Add the value, subtract its postition */
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*location = rel[i].r_addend + sym->st_value
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- (uint32_t)location;
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break;
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case R_CSKY_PCRELJSR_IMM11BY2:
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break;
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case R_CSKY_PCRELJSR_IMM26BY2:
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#if defined(__CSKYABIV2__)
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location_tmp = (uint16_t *)location;
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if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
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break;
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if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {
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/* jsri 0x... --> lrw r26, 0x... */
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CHANGE_JSRI_TO_LRW(location);
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/* lsli r0, r0 --> jsr r26 */
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SET_JSR32_R26(location + 1);
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}
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#endif
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break;
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case R_CSKY_ADDR_HI16:
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temp = ((short *)location) + 1;
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*temp = (short)
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((rel[i].r_addend + sym->st_value) >> 16);
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break;
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case R_CSKY_ADDR_LO16:
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temp = ((short *)location) + 1;
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*temp = (short)
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((rel[i].r_addend + sym->st_value) & 0xffff);
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break;
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default:
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pr_err("module %s: Unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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