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sh: Initial ELF FDPIC support.

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This adds initial support for ELF FDPIC on MMU-less SH, as per version
0.2 of the ABI definition at:

	http://www.codesourcery.com/public/docs/sh-fdpic/sh-fdpic-abi.txt

Signed-off-by: Paul Mundt <[email protected]>
This commit is contained in:
Paul Mundt 2008-05-19 13:40:12 +09:00
commit 3bc24a1a54
6 changed files with 108 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

53
include/asm-sh/elf.h
View file

@ -1,10 +1,15 @@
#ifndef __ASM_SH_ELF_H
#define __ASM_SH_ELF_H
#include <linux/utsname.h>
#include <asm/auxvec.h>
#include <asm/ptrace.h>
#include <asm/user.h>
/* ELF header e_flags defines */
#define EF_SH_PIC 0x100 /* -fpic */
#define EF_SH_FDPIC 0x8000 /* -mfdpic */
/* SH (particularly SHcompact) relocation types */
#define R_SH_NONE 0
#define R_SH_DIR32 1
@ -43,6 +48,28 @@
#define R_SH_RELATIVE 165
#define R_SH_GOTOFF 166
#define R_SH_GOTPC 167
/* FDPIC relocs */
#define R_SH_GOT20 70
#define R_SH_GOTOFF20 71
#define R_SH_GOTFUNCDESC 72
#define R_SH_GOTFUNCDESC20 73
#define R_SH_GOTOFFFUNCDESC 74
#define R_SH_GOTOFFFUNCDESC20 75
#define R_SH_FUNCDESC 76
#define R_SH_FUNCDESC_VALUE 77
#if 0 /* XXX - later .. */
#define R_SH_GOT20 198
#define R_SH_GOTOFF20 199
#define R_SH_GOTFUNCDESC 200
#define R_SH_GOTFUNCDESC20 201
#define R_SH_GOTOFFFUNCDESC 202
#define R_SH_GOTOFFFUNCDESC20 203
#define R_SH_FUNCDESC 204
#define R_SH_FUNCDESC_VALUE 205
#endif
/* SHmedia relocs */
#define R_SH_IMM_LOW16 246
#define R_SH_IMM_LOW16_PCREL 247
@ -77,9 +104,12 @@ typedef struct user_fpu_struct 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_SH )
#define elf_check_arch(x) ((x)->e_machine == EM_SH)
#define elf_check_fdpic(x) ((x)->e_flags & EF_SH_FDPIC)
#define elf_check_const_displacement(x) ((x)->e_flags & EF_SH_PIC)
#define USE_ELF_CORE_DUMP
#define ELF_FDPIC_CORE_EFLAGS EF_SH_FDPIC
#define ELF_EXEC_PAGESIZE PAGE_SIZE
/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
@ -136,6 +166,27 @@ typedef struct user_fpu_struct elf_fpregset_t;
_r->regs[8]=0; _r->regs[9]=0; _r->regs[10]=0; _r->regs[11]=0; \
_r->regs[12]=0; _r->regs[13]=0; _r->regs[14]=0; \
_r->sr = SR_FD; } while (0)
#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, \
_dynamic_addr) \
do { \
_r->regs[0] = 0; \
_r->regs[1] = 0; \
_r->regs[2] = 0; \
_r->regs[3] = 0; \
_r->regs[4] = 0; \
_r->regs[5] = 0; \
_r->regs[6] = 0; \
_r->regs[7] = 0; \
_r->regs[8] = _exec_map_addr; \
_r->regs[9] = _interp_map_addr; \
_r->regs[10] = _dynamic_addr; \
_r->regs[11] = 0; \
_r->regs[12] = 0; \
_r->regs[13] = 0; \
_r->regs[14] = 0; \
_r->sr = SR_FD; \
} while (0)
#endif
#define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX_32BIT)

4
include/asm-sh/mmu.h
View file

@ -12,6 +12,10 @@ typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
#endif
#ifdef CONFIG_BINFMT_ELF_FDPIC
unsigned long exec_fdpic_loadmap;
unsigned long interp_fdpic_loadmap;
#endif
} mm_context_t;
/*

5
include/asm-sh/ptrace.h
View file

@ -87,6 +87,11 @@ struct pt_dspregs {
unsigned long mod;
};
#define PTRACE_GETFDPIC 31 /* get the ELF fdpic loadmap address */
#define PTRACE_GETFDPIC_EXEC 0 /* [addr] request the executable loadmap */
#define PTRACE_GETFDPIC_INTERP 1 /* [addr] request the interpreter loadmap */
#define PTRACE_GETDSPREGS 55
#define PTRACE_SETDSPREGS 56
#endif